Patent Description:
An air conditioner is a device for supplying cooled/heated air into a room to control the indoor temperature and to purify the indoor air, thereby providing a comfortable indoor environment. Generally, the air conditioner includes an indoor unit including a heat exchanger and installed in an indoor space, and an outdoor unit including a compressor, a heat exchanger, and the like and supplying refrigerant to the indoor unit.

The air conditioner operates in a cooling mode or in a heating mode depending on the flow of refrigerant. During the cooling operation, high-temperature and high-pressure liquid refrigerant is supplied from the compressor of the outdoor unit by passing through the heat exchanger of the outdoor unit into the indoor unit, and the refrigerant is expanded and vaporized in the heat exchanger of the indoor unit such that ambient air temperature decreases, and as an indoor unit fan is rotated, cooled air is discharged into the indoor space. During the heating operation, high-temperature and high-pressure liquid refrigerant is supplied from the compressor of the outdoor unit into the indoor unit, and air is heated by energy which is released as the high-temperature and high-pressure liquid refrigerant is liquefied in the heat exchanger of the indoor unit, and the heated air is discharged to the indoor space by the rotation of the indoor unit fan.

As for an existing air conditioner, a user may adjust the direction of air by operating an airflow direction control means of the air conditioner directly with a hand or by using a remote control device. However, it can be very uncomfortable or complex for the user to manually operate the airflow direction control means, and if the user is located away from the air conditioner or is unable to locate the position of the remote control device or loses the remote control device, the user may not manually operate the airflow direction control means in some cases. Accordingly, various studies have been conducted to provide an optimal airflow for users even without requiring them to manually operate the airflow direction control means.

<CIT> discloses a method of sensing an occupant's movement by using an infrared sensor, determining an activity level of the occupant according to a type of sound detected by a microphone, and controlling indoor temperature based on the occupant's activity level. In addition, <CIT> discloses a method of determining a moving distance of an occupant present in a space by using an image captured by a camera provided in an indoor unit, and controlling indoor temperature based on an activity level corresponding to the moving distance.

However, when the microphone is used, sounds may be generated inside and outside of the space at the same time, such that various sounds may be input to the microphone. Accordingly, there is a problem in that the accuracy in determining various sounds simultaneously input to the microphone is significantly reduced, such that the method may not accurately determine an activity level of an occupant.

Further, an activity level of an occupant doing intense exercise at a fixed position is generally greater than an activity level when the occupant simply moves. However, when determining a moving distance to determine the activity level results in that when the occupant simply moves his activity is greater because a moving distance is longer, such that it is difficult to provide an air-conditioned environment that is optimized for the actual activity level of the occupant. <CIT> discloses an indoor unit of air conditioning device. The bottom surface of a casing is a decorative panel, and air outlets are formed along the peripheral edges of the panel. Four horizontal blades are provided to the outlets in a rotatable manner, and each blade can independently change the vertical airflow angle. A human detection sensor detects whether individuals are present within the air-conditioned room. An in-room control unit controls the rotating action of the horizontal blades so that at least one of the four horizontal blades has a different swinging movement from the remainder of the blades, and the rotating motion of the horizontal blades is stopped temporarily with a prescribed timing. Additionally, the in-room control unit sets the prescribed timing on the basis of the detection results from the human detection sensor.

It is an object of the present invention to solve the above and other problems.

It is another object of the present invention to provide an air conditioner capable of accurately determining an occupant's activity level, and a method of operating the same.

It is yet another object of the present invention to provide an air conditioner capable of providing an optimal airflow for an occupant based on a position and an activity level of the occupant, and a method of operating the same.

It is still another object of the present invention to provide an air conditioner capable of controlling the temperature of an indoor space appropriately based on an activity level of an occupant, and a method of operating the same.

The objects of the present invention are not limited to the aforementioned objects and other objects not described herein will be clearly understood by those skilled in the art from the following description.

The object is solved by the features of the independent claims preferred embodiments are given in the dependent claims.

In accordance with an aspect of the present invention, the above and other objects can be accomplished by providing an air conditioner, including: a case having an internal space. The space is open to the bottom side, wherein the open side is covered by a panel. The case, in particular the panel includes an inlet and an outlet both facing downwardly, when the air conditioner is mounted at a ceiling of room.

In case the air conditioner is mounted otherwise, the inlet is provided at the panel to introduce air being in front of the panel. The outlets are disposed also at the panel to discharge air being cooled or heated by the air conditioner to the space in front of the outlets.

Basically, the general idea is not bound to the construction of the air conditioner shown in <FIG>. So, the inlet and the one or more outlets might be disposed at any position of the case being suitable for sucking in air by the inlet, which should be cooled or heated or for the one or more outlets at a position by suitable for discharging the cooled or heated air into the room or space to be heated or cooled.

In one or more embodiments, a plurality of outlets may be provided being open downwardly.

In one or more embodiments, a plurality of airflow direction control units may be provided.

In one or more embodiments, one airflow direction control unit may be disposed at the respective outlets, respectively.

A camera is disposed at the case to be directed toward an indoor space.

However, the camera may be also disposed at any other position, even spaced apart from the case, if it can capture images of the room to be cooled or heated, wherein the one or more images should be suitable for determining the activity level of an occupant in the room.

The air conditioner further comprises a controller configured to determine an activity level of an occupant for each of a plurality of areas of the indoor space based on a plurality of images corresponding to the indoor space; determines a direction of air discharged from the respective outlets based on the determined activity level; and controls the airflow direction control unit according to the direction of the air which is determined for the respective outlets.

In another aspect, which might be combined with the general idea mentioned above an air conditioner is provided comprising: a case having a space formed therein and an open bottom; a panel disposed under the case and having an inlet and a plurality of outlets disposed around a circumference of the inlet; a fan disposed in the case and configured to generate an airflow from the inlet to the plurality of outlets; an airflow direction control unit disposed at the respective outlets and configured to control an airflow direction of air flowing through the respective outlets in an upward and downward direction; a camera disposed on one side of the panel to be directed toward an indoor space; and a controller configured to control the airflow direction control unit based on images corresponding to the indoor space and captured by the camera, wherein the controller is configured to: determine an activity level of an occupant for each of a plurality of areas of the indoor space based on a plurality of images corresponding to the indoor space; determine a direction of air discharged from the respective outlets based on the determined activity level; and control the airflow direction control unit according to the direction of the air which is determined for the respective outlets.

In one or more embodiments, the indoor space is divided based on an image taken by the camera into a plurality of areas, wherein one or more outlets are assigned to each area.

Thus, the outlet and the airflow direction control unit associated to that outlet might be individually controlled based on the activity level determined for that specific area.

Thereby, it is possible to control the air discharged to a certain area having low activity differently than the air discharged into an area of high activity. The difference of air discharging might be to cool or heat the area of higher activity with a more direct cooling/heating and to cool or heat the area of lower activity with more indirect cooling/heating or vice versa. The decision whether to cool/heat directly or indirectly might be set based on user preference being inserted by a user or might based on whether the temperature in the specific area is within a set temperature range or not. So, the control of the air discharge at the respective outlets might based on whether a set temperature range is achieved and should be maintained or whether a certain temperature should be achieved.

The control of the air discharged to a certain area might be set differently in the direction of outputting the air discharged from the outlet. According to an embodiment of the present invention, among the plurality of areas, if an activity level for a first area is greater than a predetermined level and an activity level for a second area is less than the predetermined level, the controller may control the airflow direction control unit so that a direction of air discharged from a first outlet corresponding to the first area is different from a direction of air discharged from a second outlet corresponding to the second area in the upward and downward direction.

According to an embodiment of the present invention, during a cooling operation, the controller may control the airflow direction control unit so that the direction of the air discharged from the first outlet may be vertically below the direction of the air discharged from the second outlet.

According to an embodiment of the present invention, during a heating operation, the controller may control the airflow direction control unit so that the direction of the air discharged from the first outlet is vertically above the direction of the air discharged from the second outlet.

According to an embodiment of the present invention, among the plurality of areas, if an activity level corresponding to a third area satisfies a criterion associated with the predetermined level, the controller may control the airflow direction control unit so that a direction of air discharged from a third outlet corresponding to the third area may change continuously between the direction of the air discharged from the first outlet and the direction of the air discharged from the second outlet.

According to an embodiment of the present invention, the air conditioner may further include a temperature sensor configured to sense temperature of the indoor space, wherein the controller may set a target temperature based on a result of comparison between a predetermined reference and a sum of activity levels of the occupant which are determined for each of the plurality of areas; and may control the temperature of the indoor space based on a difference between a current temperature of the indoor space, which is sensed by the temperature sensor, and the target temperature.

According to an embodiment of the present invention, the controller may calculate a motion vector for a plurality of pixels constituting the occupant and included in the plurality of images by using a dense optical flow method; and may determine the activity level of the occupant based on the calculated motion vector.

According to an embodiment of the present invention, the controller may determine, as the activity level of the occupant, a value obtained by dividing a sum of magnitudes of motion vectors for the plurality of pixels, which are calculated for the plurality of images, by a number of the pixels.

According to an embodiment of the present invention, the airflow direction control unit may include a plurality of vanes disposed at the respective outlets, wherein by adjusting an arrangement of each of the vanes, the controller may change the direction of the air discharged from the respective outlets.

According to an embodiment of the present invention, the airflow direction control unit may include a plurality of airflow direction control fans, each disposed on one side of the respective outlets, wherein by regulating a rotational speed of the plurality of airflow direction control fans, the controller may change the direction of the air discharged from the respective outlets.

In accordance with another aspect of the present invention, the above and other objects can be accomplished by providing a method of operating an air conditioner, the method including: determining an activity level of an occupant for each of a plurality of areas of an indoor space based on a plurality of images corresponding to the indoor space and captured by a camera of the air conditioner; determining a direction of air discharged from the respective outlets based on the determined activity level; and according to the direction of the air which is determined for the respective outlets, controlling an airflow direction control unit configured to control an airflow direction of air flowing through the respective outlets in an upward and downward direction.

According to an embodiment of the present invention, the controlling of the airflow direction control unit may include a first operation of controlling the airflow direction control unit in which, among the plurality of areas, if an activity level for a first area is greater than a predetermined level and an activity level for a second area is less than the predetermined level, the airflow direction control unit is controlled so that a direction of air discharged from a first outlet corresponding to the first area is different from a direction of air discharged from a second outlet corresponding to the second area in the upward and downward direction.

According to an embodiment of the present invention, the first operation of controlling the airflow direction control unit may include: a second operation of controlling the airflow direction control unit in which, during a cooling operation, the airflow direction control unit is controlled so that the direction of the air discharged from the first outlet is vertically below the direction of the air discharged from the second outlet; and a third operation of controlling the airflow direction control unit in which, during a heating operation, the airflow direction control unit is controlled so that the direction of the air discharged from the first outlet is vertically above the direction of the air discharged from the second outlet.

According to an embodiment of the present invention, the controlling of the airflow direction control unit may include, among the plurality of areas, if an activity level corresponding to a third area satisfies a criterion associated with the predetermined level, controlling the airflow direction control unit so that a direction of air discharged from a third outlet corresponding to the third area may change continuously between the direction of the air discharged from the first outlet and the direction of the air discharged from the second outlet.

According to an embodiment of the present invention, the method of operating an air conditioner may further include: setting a target temperature based on a result of comparison between a predetermined reference and a sum of activity levels of the occupant which are determined for each of the plurality of areas; and controlling temperature of an indoor space based on a difference between a current temperature of the indoor space, which is sensed by a temperature sensor for sensing the temperature of the indoor space, and the target temperature.

According to an embodiment of the present invention, the determining of the activity level of the occupant may include: by using a dense optical flow method, calculating a motion vector for a plurality of pixels constituting the occupant and included in the plurality of images; and determining the activity level of the occupant based on the calculated motion vector.

According to an embodiment of the present invention, the determining of the activity level of the occupant based on the calculated motion vector may include determining, as the activity level of the occupant, a value obtained by dividing a sum of magnitudes of motion vectors for the plurality of pixels, which are calculated for the plurality of images, by a number of the pixels.

According to an embodiment of the present invention, the airflow direction control unit may include a plurality of vanes disposed at the respective outlets, wherein the controlling of the airflow direction control unit may include changing the direction of the air discharged from the respective outlets by adjusting an arrangement of each of the vanes.

According to an embodiment of the present invention, the airflow direction control unit may include a plurality of airflow direction control fans, each disposed on one side of the respective outlets, wherein the controlling of the airflow direction control unit may include changing the direction of the air discharged from the respective outlets by regulating a rotational speed of the plurality of airflow direction control fans.

According to an embodiment of the present invention, a distance between the third area and the air conditioner may be longer than at least one of a distance between the first area and the air conditioner and a distance between the second area and the air conditioner.

Other detailed matters of the exemplary embodiments are included in the detailed description and the drawings.

According to various embodiments of the present invention, the present invention has one or more of the following effects.

First, based on a result of processing pixels included in images of an indoor space, an activity level of an occupant may be determined accurately.

Second, by determining the position and activity level of the occupant for each of a plurality of areas of the indoor space, the direction of air supplied to the respective areas may be adjusted to various airflow directions, thereby providing an optimal airflow for the occupant.

Third, by comprehensively determining activity levels of all the occupants present in the indoor space, a target temperature optimized for the occupants may be set, such that the temperature of the indoor space may be controlled appropriately.

The effects of the present invention are not limited to the aforesaid, and other effects not described herein will be clearly understood by those skilled in the art from the following description of the appended claims.

In order to clearly and briefly describe the present invention, components that are irrelevant to the description will be omitted in the drawings. The same reference numerals are used throughout the drawings to designate the same or similar components, and a redundant description thereof will be omitted.

Terms "module" and "unit" for elements used in the following description are given simply in view of the ease of the description, and do not carry any important meaning or role. Therefore, the terms "module" and "unit" may be used interchangeably.

It should be understood that the terms, "comprise", 'include", "have", etc. when used in this specification, specify the presence of stated features, integers, steps, operations, elements, components, or combinations thereof but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings for description of a method of controlling an air conditioner.

Referring to <FIG>, a configuration of an air conditioner <NUM> according to a first embodiment will be described below.

The air conditioner <NUM> of the present invention may be a ceiling mounted air conditioner <NUM>.

Referring to <FIG>, the air conditioner <NUM> may include an inlet <NUM> which is open downwardly, and an outlet <NUM> which is disposed at least partly around the inlet <NUM> and is open downwardly.

Referring to <FIG>, the air conditioner <NUM> may include a case <NUM> having a space formed therein and an open bottom; a panel <NUM> disposed under the case <NUM> and having the inlet <NUM> and the outlet <NUM> formed therein; a fan <NUM> disposed in the case <NUM>; a fan motor <NUM> for rotating the fan <NUM>; a heat exchanger <NUM> for heat exchange with air blown by the fan <NUM>; and an airflow direction control unit <NUM> disposed at the outlet <NUM> and configured to control an airflow direction of flowing air.

Referring to <FIG>, the panel <NUM> may have a plurality of outlets 124a, 124b, 124c, and 124d formed therein and which are spaced apart from each other in different directions around the circumference of the inlet <NUM>. The outlet <NUM> may include a first outlet 124a, a second outlet 124b, a third outlet 124c, and a fourth outlet 124d. The first outlet 124a, the second outlet 124b, the third outlet 124c, and the fourth outlet 124d may be adjacent to each other and may be perpendicular to each other with respect to the inlet <NUM>. Thus, each side of the inlet <NUM> may have one of the first outlet 124a, the second outlet 124b, the third outlet 124c, and the fourth outlet 124d. A first airflow direction control unit 130a, a second airflow direction control unit 130b, a third airflow direction control unit 130c, and a fourth airflow direction control unit 130d may be disposed at the first outlet 124a, the second outlet 124b, the third outlet 124c, and the fourth outlet 124d, respectively.

The configuration of one outlet <NUM> and the airflow direction control unit <NUM> disposed therein, which will be described below, may also be applied to the other outlets and airflow direction control units disposed therein, and thus are designated by the common reference numerals.

Basically, the airflow direction control unit <NUM> may include at least one vane disposed in or at one outlet <NUM> or at least one an airflow direction control fan <NUM> disposed on one side of the outlet <NUM>.

Referring to <FIG>, the airflow direction control unit <NUM> may comprise a first vane <NUM> coupled to two links <NUM> and <NUM>, and a second vane <NUM> coupled to one of the links coupled to the first vane <NUM> and having one side rotatably coupled to the panel <NUM>.

The first vane <NUM> and the second vane <NUM>, which are disposed in each of the first outlet <NUM>, the second outlet <NUM>, the third outlet <NUM>, and the fourth outlet <NUM>, may be disposed at different positions.

The first vane <NUM> may cover the outlet <NUM> or may be disposed under the outlet <NUM>. The first vane <NUM> may be formed longer than the second vane <NUM>.

Referring to <FIG>, while the fan <NUM> is in a stop state in which the fan is not in operation, the first vane <NUM> may be disposed below the second vane <NUM>. The first vane <NUM> may include a first vane plate <NUM> for guiding an airflow direction of flowing air, and a first link plate <NUM> protruding forwardly from both ends of the left and right sides of the first vane plate <NUM> and coupled to the plurality of links <NUM> and <NUM>.

The second vane <NUM> may include a second vane plate <NUM>, a second link plate <NUM> protruding forwardly from both ends of the left and right sides of the second vane plate <NUM> and coupled to a third link <NUM>, and a connector <NUM> disposed in a left-right direction of the second vane plate <NUM> and coupled to the panel <NUM>. The second vane plate <NUM> may have a curved shape. However, in another example, the second vane plate <NUM> may have a flat shape.

Referring to <FIG>, the airflow direction control unit <NUM> may include the first link <NUM> rotatably coupled to the panel <NUM> and the first vane <NUM>, and the second link <NUM> spaced apart from the first link <NUM> and rotatably coupled to the panel <NUM> and the first vane <NUM>. Referring to <FIG>, the airflow direction control unit <NUM> may include the third link <NUM> rotatably coupled to one end of the first link <NUM> and the second vane <NUM>.

The first link <NUM> may be rotatably coupled to the first vane <NUM> and the second vane <NUM>. The first link <NUM> may be coupled to a vane motor (not shown) to be rotated thereby. The first link <NUM> may include: a panel connector <NUM> rotatably coupled to the panel <NUM>; a first link bar <NUM> extending toward the first vane <NUM> and having an end rotatably coupled to the first vane <NUM>; and a second link bar <NUM> extending from the panel connector <NUM> toward the second vane <NUM> and having an end rotatably coupled to the second vane <NUM>.

Referring to <FIG>, a length <NUM> of the first link bar <NUM> may be formed longer than a length <NUM> of the second link bar <NUM>. The length <NUM> of the first link bar <NUM> may be formed shorter than a length <NUM> of the second link <NUM>. The length <NUM> of the first link bar <NUM> may be formed longer than a length <NUM> of the third link <NUM>.

The first link <NUM> may be disposed closer to the inlet <NUM> than the second link <NUM>.

An arrangement of the first vane <NUM> may be changed by the first link <NUM> and the second link <NUM>. As the arrangement of the first vane <NUM> is changed by the first link <NUM> and the second link <NUM>, the first vane <NUM> may be spaced apart downwardly from the outlet <NUM>. The first vane <NUM> may be elevated downwardly, and then its inclination may be changed in a direction perpendicular to a ground.

A first end 151a of the second vane <NUM> is moved downwardly, and then the first end 151a may be moved inwardly and outwardly according to the arrangement of the third link <NUM>.

Referring to <FIG>, in the following description of the first vane <NUM> and the second vane <NUM>, ends of each of the first vane <NUM> and the second vane <NUM>, which are disposed far away from the inlet <NUM>, are defined as first ends 141a and 151a, respectively; and ends of each of the first vane <NUM> and the second vane <NUM>, which are disposed adjacent to the inlet <NUM>, are defined as second ends 141b and 151b, respectively.

The second vane <NUM> may be rotatably coupled to the panel <NUM> at a position inwardly from the first vane <NUM>. Here, a direction adjacent to the inlet <NUM> may be set as an inward direction, and a direction further away from the inlet <NUM> may be set as an outward direction.

Referring to <FIG>, the airflow direction control unit <NUM> may adjust an airflow direction of air discharged through the outlet <NUM> according to the arrangement.

Referring to <FIG>, the airflow direction control unit <NUM> may be disposed in a first position P1 in which the air discharged through the outlet <NUM> flows in a direction horizontal to the ground. Referring to <FIG>, when the airflow direction control unit <NUM> is disposed in the first position P1, the first vane <NUM> may be disposed approximately horizontal to the ground. Referring to <FIG>, when the airflow direction control unit <NUM> is disposed in the first position P1, the first vane <NUM> may form a first inclination angle θ1 of <NUM> degrees or less with respect to a virtual horizontal line parallel to the ground. Here, the first inclination angle θ1 is formed between the first vane <NUM> and the virtual horizontal line which is parallel to the ground, and may vary depending on the arrangement of the first vane <NUM>.

Referring to <FIG>, when the airflow direction control unit <NUM> is disposed in the first position P1, the second end 141b of the first vane <NUM> may be disposed adjacent to the first end 151a of the second vane <NUM>. The second end 141b of the first vane <NUM> may be directed toward the first end 151a of the second vane <NUM>.

Referring to <FIG>, when the airflow direction control unit <NUM> is disposed in the first position P1, the first inclination angle θ1, formed between the first vane <NUM> and the virtual horizontal line, may be smaller than a second inclination angle θ2 between a virtual line, connecting the first end 141a and the second end 151b of the second vane <NUM>, and the virtual horizontal line (or a "second inclination angle between the second vane and the virtual horizontal line"). Here, the second inclination angle θ2 is formed between the virtual line, connecting the first end 151a and the second end 151b of the second vane <NUM>, and the virtual horizontal line, and may vary depending on the arrangement of the second vane <NUM>.

Accordingly, air flowing downwardly through the outlet <NUM> may sequentially flow along the second vane <NUM> and the first vane <NUM>. Referring to <FIG>, when the airflow direction control unit <NUM> is disposed in the first position P1, the air discharged through the outlet <NUM> may flow in a direction horizontal to the ground.

Referring to <FIG>, the first vane <NUM> and the second vane <NUM> may be disposed in a second position P2 in which the air discharged through the outlet <NUM> flows in a direction perpendicular to the ground. Referring to <FIG>, when the airflow direction control unit <NUM> is disposed in the second position P2, the first vane <NUM> may be disposed approximately perpendicular to the ground. Referring to <FIG>, when the airflow direction control unit <NUM> is disposed in the second position P2, the first vane <NUM> may form a first inclination angle θ1 of <NUM> degrees or more with respect to the virtual horizontal line parallel to the ground.

Referring to <FIG>, when the airflow direction control unit <NUM> is disposed in the second position P2, the second end 141b of the first vane <NUM> may be spaced apart from the first end 151a of the second vane <NUM>. Referring to <FIG>, when the airflow direction control unit <NUM> is disposed in the second position P2, the second end 141b of the first vane <NUM> may be disposed above the first end 151a of the second vane <NUM>.

Referring to <FIG>, when the airflow direction control unit <NUM> is disposed in the second position P2, the second end 141b of the first vane <NUM> may be directed above the second end 151b of the second vane <NUM>. Referring to <FIG>, when the airflow direction control unit <NUM> is disposed in the second position P2, the first vane <NUM> and the second vane <NUM> may be disposed approximately parallel to each other.

Referring to <FIG>, when the airflow direction control unit <NUM> is disposed in the second position P2, the first inclination angle θ1, formed between the first vane <NUM> and the virtual horizontal line, may be similar to the second inclination angle θ2 formed between the second vane <NUM> and the virtual horizontal line. Referring to <FIG>, when the airflow direction control unit <NUM> is disposed in the second position P2, the air discharged through the outlet <NUM> may flow in a direction perpendicular to the ground.

Referring to <FIG>, the first vane <NUM> and the second vane <NUM> may be disposed in a third position P3 in which the air discharged through the outlet <NUM> flows in a direction diagonal to the ground. When the airflow direction control unit <NUM> is disposed in the third position P3, the air discharged by passing through the first vane <NUM> and the second vane <NUM> may form a diagonal airflow which is directed downwardly below a horizontal airflow in the first position P1 and is directed upwardly above a vertical airflow in the second position P2.

Referring to <FIG>, when the airflow direction control unit <NUM> is disposed in the third position P3, the first vane <NUM> may be disposed at an inclination angle between the first vane <NUM> when the airflow direction control unit <NUM> is disposed in the first position P1, and the first vane <NUM> when the airflow direction control unit <NUM> is disposed in the second position P2. Referring to <FIG>, when the airflow direction control unit <NUM> is disposed in the third position P3, the first vane <NUM> may form a first inclination angle θ1, ranging from <NUM> degrees to <NUM> degrees, with respect to the virtual horizontal line parallel to the ground.

When the airflow direction control unit <NUM> is disposed in the third position P3, a separated distance between the second end 141b of the first vane <NUM> and the first end 151a of the second vane <NUM> may be longer than a separated distance between the second end 141b of the first vane <NUM> and the first end 151a of the second vane <NUM> when the airflow direction control unit <NUM> is disposed in the first position.

When the airflow direction control unit <NUM> is disposed in the third position P3, a separated distance between the second end 141b of the first vane <NUM> and the first end 151a of the second vane <NUM> may be shorter than a separated distance between the second end 141b of the first vane <NUM> and the first end 151a of the second vane <NUM> when the airflow direction control unit <NUM> is disposed in the second position P2.

When the airflow direction control unit <NUM> is disposed in the first position P1, a horizontal airflow may be generated so that the air discharged through the outlet may flow in a direction horizontal to the ground. When the airflow direction control unit <NUM> is disposed in the second position P2, a vertical airflow may be generated so that the air discharged through the outlet may flow in a direction perpendicular to the ground. When the airflow direction control unit <NUM> is disposed in the third position P3, a diagonal airflow may be generated so that the air discharged through the outlet may flow in a direction between an indirect airflow and the vertical airflow. The horizontal airflow and the indirect airflow may be used interchangeably, or the vertical airflow and direct airflow may be used interchangeably.

Referring to <FIG>, the air discharged through the outlet <NUM> may be divided into three vertical directions by the airflow direction control unit <NUM>.

When the airflow direction control unit <NUM> is disposed in the first position P1, the air discharged through the outlet <NUM> may flow in an upward direction. When the airflow direction control unit <NUM> is disposed in the second position P2, the air discharged through the outlet <NUM> may flow in a downward direction. When the airflow direction control unit <NUM> is disposed in the third position P3, the air discharged through the outlet <NUM> may flow in an intermediate direction between the upward direction and the downward direction.

In a vertical airflow range according to the first position P1, the second position P2, and the third position P3 of the airflow direction control unit <NUM>, an airflow when the airflow direction control unit <NUM> is in the third position P3 may be generated below an airflow generated when the airflow direction control unit <NUM> is in the first position P1 and may be generated above an airflow generated when the airflow direction control unit <NUM> is in the second position P2.

Under cooling and heating conditions, the vertical airflow range may vary according to the first position P1, the second position P2, and the third position P3 of the airflow direction control unit <NUM>.

Referring to <FIG>, when the airflow direction control unit <NUM> is disposed in the first position P1, the air discharged through the outlet <NUM> may flow in a first direction D1. Here, the first direction D1 may refer to a direction in which an angle formed between a main flow direction of the air discharged through the outlet <NUM> and the ground is in a range of zero degrees to <NUM> degrees. In the first direction D1, the angle may be formed in the same range under both the heating and cooling conditions.

Referring to <FIG>, when the airflow direction control unit <NUM> is disposed in the second position P2, the air discharged through the outlet <NUM> may flow in a second direction D2.

In the second direction D2, the angle may be formed in different ranges under the heating and cooling conditions. Referring to <FIG>, under the heating condition, the second direction D2 may refer to a direction in which the angle formed between the main flow direction of the air discharged through the outlet <NUM> and the ground is in a range of <NUM> degrees to <NUM> degrees. Referring to <FIG>, under the cooling condition, the second direction D2 may refer to a direction in which the angle formed between the main flow direction of the air discharged through the outlet <NUM> and the ground is in a range of <NUM> degrees to <NUM> degrees.

Referring to <FIG>, when the airflow direction control unit <NUM> is disposed in the third position P3, the air discharged through the outlet <NUM> may flow in a third direction D3.

In the third direction D3, the angle may be formed in different ranges under the heating and cooling conditions. Referring to <FIG>, under the heating condition, the third direction D3 may refer to a direction in which the angle formed between the main flow direction of the air discharged through the outlet <NUM> and the ground is in a range of <NUM> degrees to <NUM> degrees. Referring to <FIG>, under the cooling condition, the third direction D3 may refer to a direction in which the angle formed between the main flow direction of the air discharged through the outlet <NUM> and the ground is in a range of <NUM> degrees to <NUM> degrees.

The ranges of the angle in the first direction D1, the second direction D2, and the third direction D3 are merely an example, and may vary according to a space in which the air conditioner is disposed or a structure of the air conditioner.

Further, while <FIG> illustrate the airflow is divided into three sections, the airflow may also be subdivided into four to six sections.

<FIG> is a block diagram illustrating an air conditioner according to an embodiment of the present invention, and <FIG> is a schematic diagram illustrating an outdoor unit and an indoor unit according to an embodiment of the present invention.

Referring to <FIG> and <FIG>, the air conditioner <NUM> may include a communication unit <NUM>, a sensor unit <NUM>, a memory <NUM>, a fan driver <NUM> for driving a fan <NUM>, a compressor driver <NUM> for driving the compressor <NUM>, and/or a controller <NUM>.

The communication unit <NUM> may include at least one communication module. For example, the communication unit <NUM> may be provided for each of an outdoor unit <NUM> and an indoor unit <NUM>, and the outdoor unit <NUM> and the indoor unit <NUM> may transmit and receive data with each other.

A communication method of the outdoor unit <NUM> and the indoor unit <NUM> may include, for example, not only a wired communication technology, such as communication using power lines, serial communication (e.g., RS-<NUM> serial communication), and communication using a refrigerant pipe, but also a wireless communication technology such as Wi-Fi, Bluetooth, Beacon, Zigbee, and the like.

The communication unit <NUM> may transmit and receive data to and from the outside of the air conditioner <NUM>. For example, the communication unit <NUM> may access a server connected to an external network to transmit and receive data.

The sensor unit <NUM> may include at least one sensor and may transmit data on a value, detected by the sensor, to the controller <NUM>.

The sensor unit <NUM> may include a heat exchanger temperature sensor (not shown). For example, the heat exchanger temperature sensor may be disposed in an indoor heat exchanger <NUM> to detect temperature of the indoor heat exchanger <NUM>.

The sensor unit <NUM> may include a pipe temperature sensor (not shown) for detecting the temperature of a refrigerant flowing through each pipe.

The sensor unit <NUM> may include a pressure sensor (not shown) for detecting pressure of a gaseous refrigerant flowing through each pipe.

The sensor unit <NUM> may include an indoor temperature sensor (not shown) for detecting indoor temperature and/or an outdoor temperature sensor (not shown) for detecting outdoor temperature.

The sensor unit <NUM> may include an indoor humidity sensor (not shown) for detecting indoor humidity and/or an outdoor humidity sensor (not shown) for detecting outdoor humidity.

The sensor unit <NUM> may include an image sensor (not shown) for converting light into an electrical signal. The image sensor may include a plurality of photodiodes corresponding to a plurality of pixels. The image sensor may include a charge-coupled device (CCD) image sensor or a complementary metal-oxide-semiconductor (CMOS) image sensor, but the present disclosure is not limited thereto.

The air conditioner <NUM> may further include a lens through which light emanating from a subject passes, a digital signal processor for configuring and processing an image based on a signal output from the image sensor, and the like. Here, the digital signal processor may be implemented as at least a part of the processor <NUM> or as a separate processor operating independently from the processor <NUM>. For example, in the case where the digital signal processor is implemented as a separate processor, the image processed by the digital signal processor may be stored in the memory as it is or after being further processed by the controller <NUM>.

An airflow direction control unit <NUM> may adjust an airflow direction of air discharged from the air conditioner <NUM>. The airflow direction control unit <NUM> may include at least one vane disposed adjacent to an outlet through which air is discharged, a vane motor for driving the vane, an airflow direction control fan, and the like. For example, according to a first embodiment of the present invention, the airflow direction control unit <NUM> (e.g., airflow direction control unit <NUM> of <FIG>) may include the first vane <NUM> coupled to two links <NUM> and <NUM>, and the second vane <NUM> coupled to one of the links coupled to the first vane <NUM> and having one side rotatably coupled to the panel <NUM>.

The compressor driver <NUM> may drive the compressor <NUM>. The compressor driver <NUM> may include: a rectifier (not shown) for rectifying AC power into DC power and outputting the rectified power; a DC terminal capacitor (not shown) for storing a ripple voltage from the rectifier; an inverter (not shown) including a plurality of switching elements to convert the smoothed DC power into <NUM>-phase AC power having a predetermined frequency and output the power; and/or a compressor motor 102b for driving the compressor <NUM> according to the three-phase AC power.

The fan driver <NUM> may drive the fan <NUM> provided in the air conditioner <NUM>. For example, the fan <NUM> may include an outdoor fan 105a and/or an indoor fan <NUM>.

The fan driver <NUM> may include: the rectifier (not shown) for rectifying AC power into DC power and outputting the rectified power; the DC terminal capacitor (not shown) for storing a ripple voltage from the rectifier; the inverter (not shown) including a plurality of switching devices to convert the smoothed DC power into <NUM>-phase AC power having a predetermined frequency and output the power; and/or at least one motor for driving the fan <NUM> according to the <NUM>-phase AC power.

In addition, the fan driver <NUM> may include separate components for driving each of the outdoor fan 105a and the indoor fan <NUM>. For example, the air conditioner <NUM> may include a first fan driver for driving the outdoor fan 105a and a second fan driver for driving the indoor fan <NUM>.

The memory <NUM> may store data on a reference value associated with the operation of each component provided in the air conditioner <NUM>.

The memory <NUM> may store programs for processing and controlling each signal in the controller <NUM>, and may store processed data as well as data to be processed. For example, the memory <NUM> may store application programs designed for performing various operations that may be processed by the controller <NUM>; and in response to a request of the controller <NUM>, the memory <NUM> may selectively provide some of the stored application programs.

The memory <NUM> may include at least one of a volatile memory (e.g., DRAM, SRAM, SDRAM, etc.) and a non-volatile memory (e.g., flash memory, hard disk memory (HDD), solid-state drive (SSD), etc.).

The controller <NUM> may include at least one processor and may control the overall operation of the air conditioner <NUM> by using the processor included therein. Here, the processor may be a general processor such as a central processing unit (CPU). Obviously, the processor may be a dedicated device, such as an ASIC, or other hardware-based processor.

The controller <NUM> may control the overall operation of the air conditioner <NUM>. The controller <NUM> may be connected to the respective components provided in the air conditioner <NUM> and may transmit and/or receive signals with the respective components to control the overall operation of the respective components.

The controller <NUM> may control the operation of the fan driver <NUM> to change the RPM of the fan <NUM>. For example, by changing a frequency of the three-phase AC power output to the outdoor fan motor 105b under the control of the controller <NUM>, the fan driver <NUM> may change the RPM of the outdoor fan 105a. For example, by changing a frequency of the three-phase AC power output to the indoor fan motor <NUM> under the control of the controller <NUM>, the fan driver <NUM> may change the RPM of the indoor fan <NUM>.

The controller <NUM> may control the operation of the compressor driver <NUM> to change an operating frequency of the compressor <NUM>. For example, by changing the frequency of the three-phase AC power output to the compressor motor 102b under the control of the controller <NUM>, the compressor driver <NUM> may change the operating frequency of the compressor <NUM>.

The controller <NUM> may obtain data associated with the respective components provided in the air conditioner <NUM>. In this case, by considering a computational load, the controller <NUM> may obtain data associated with the respective components provided in the air conditioner <NUM> at predetermined time intervals during a predetermined period. Here, the data associated with the respective components provided in the air conditioner <NUM> may include, for example, the operating frequency of the compressor <NUM>, the temperature of a refrigerant flowing into the compressor <NUM>, the temperature of a refrigerant discharged from the compressor <NUM>, the pressure of a refrigerant flowing into the compressor <NUM>, the pressure of a refrigerant discharged from the compressor <NUM>, a pipe temperature at an inlet side of the indoor unit <NUM>, a pipe temperature at an outlet side of the indoor unit <NUM>, an opening degree of an Electric Expansion Valve (EEV), and the like.

The controller <NUM> may perform various operations based on the obtained data and may control the overall operation of the respective components included in the air conditioner <NUM> based on operation results.

The controller <NUM> may process the image acquired by the image sensor. For example, the controller <NUM> may remove noise from the image or may perform signal processing on the image, such as gamma correction, color filter array interpolation, color matrix, color correction, color enhancement, and the like.

The controller <NUM> may detect an object included in the image by using at least one method. For example, the controller <NUM> may extract characteristic points from the image by using a method, such as scale invariant feature transform (SIFT), histogram of oriented gradient (HOG), etc., and may detect the object included in the image based on the extracted characteristic points. In this case, the controller <NUM> may detect the object included in the image by determining a boundary of the object using an algorithm, such as support vector machine (SVM), AdaBoost, and the like.

Based on the plurality of processed images, the controller <NUM> may detect a motion of the object included in the plurality of images. For example, by using a dense optical flow method, the controller <NUM> may calculate a motion vector for a plurality of pixels constituting the object detected in the image, and may calculate the motion of the object based on the calculated motion vector. In this embodiment, the calculation is performed using the dense optical flow method, but the present invention is not limited thereto, and a sparse optical flow method for calculating a motion vector of some characteristic pixels may also be used.

The controller <NUM> may determine an activity level of the object detected in the image. For example, the controller <NUM> may determine, as an activity level of the object detected in the image, a value obtained by dividing a sum of magnitudes of motion vectors for pixels included in the object by the number of pixels included in the object.

The controller <NUM> may be provided not only in the outdoor unit <NUM> and the indoor unit <NUM>, but also in a central controller for controlling the operation of the outdoor unit <NUM> and/or the indoor unit <NUM>.

The outdoor unit <NUM> may include: a compressor 102b for compressing a refrigerant; the compressor motor 102b for driving the compressor 102b; an outdoor heat exchanger <NUM> for radiating heat of the compressed refrigerant; the outdoor fan 105a disposed on one side of the outdoor heat exchanger <NUM> and accelerating heat radiation from the refrigerant; the motor 105b for rotating the outdoor fan 105a; an expansion valve <NUM> for expanding a condensed refrigerant; a cooling/heating switch valve <NUM> for changing a passage of the compressed refrigerant; and an accumulator <NUM> for temporarily storing a gaseous refrigerant to remove moisture and foreign matter from the refrigerant and supplying the refrigerant at constant pressure to the compressor.

The indoor unit <NUM> may include: an indoor heat exchanger <NUM> disposed indoors and performing cooling/heating operations; and an indoor fan <NUM> disposed on one side of the indoor heat exchanger <NUM> and accelerating heat radiation from the refrigerant; and a motor <NUM> for rotating the indoor fan <NUM>.

<FIG> are diagrams referred to in the description of the operation of an airflow direction control unit included in an air conditioner according to an embodiment of the present invention. In the following description, directions of the air conditioner <NUM> may be defined based on an orthogonal coordinates system illustrated in <FIG>. In the orthogonal coordinates system, the x-axis direction may be defined as a left and right direction of the air conditioner <NUM>. In this case, with respect to the origin point, a right direction may be oriented in the direction of the positive x-axis, and a left direction may be oriented in the direction of the negative x-axis. The y-axis direction may be defined as a forward and backward direction of the air conditioner <NUM>. In this case, with respect to the origin point, a forward direction may be oriented in the direction of the positive y-axis, and a backward direction may be oriented in the direction of the negative y-axis. The z-axis direction may be defined as an upward and downward direction. With respect to the origin point, an upward direction may be oriented in the direction of the positive z-axis; and a downward direction may be oriented in the direction of the negative z-axis.

Referring to <FIG>, the air conditioner <NUM> may obtain an image corresponding to a predetermined indoor space <NUM> by using a camera <NUM>, <NUM>. The camera <NUM>, <NUM> may be implemented as a lens, an image sensor, a digital signal processor, and the like. For example, light emanating from the indoor space <NUM> may pass through the lens to be incident on the image sensor, and the image sensor may convert the light into an electrical signal. In this case, the signal output from the image sensor may be transmitted to the controller <NUM> as it is or after being processed by the digital signal processor <NUM>. In this embodiment, one camera <NUM> is provided in the air conditioner <NUM>, but the present invention is not limited thereto, and two or more cameras <NUM>, <NUM> may be provided in the air conditioner <NUM>.

Based on the signal transmitted from the image sensor and/or the digital signal processor, the controller <NUM> may obtain the image corresponding to the indoor space <NUM>. By processing the image corresponding to the indoor space <NUM>, the controller <NUM> may perform determination on the indoor space <NUM>.

In the case where the air conditioner <NUM> is mounted on a ceiling, the camera <NUM> may be directed downward of the air conditioner <NUM>. For example, the camera <NUM> may be disposed on one side of the panel <NUM> disposed under the case <NUM> of the air conditioner <NUM>.

Referring to <FIG>, the indoor space <NUM> may be divided into a plurality of areas. The plurality of areas may correspond to at least one of the plurality of outlets <NUM> of the air conditioner <NUM>.

A first area <NUM> of the indoor space <NUM> may correspond to the first outlet <NUM> of the air conditioner <NUM>. A second area <NUM> of the indoor space <NUM> may correspond to the second outlet 124b of the air conditioner <NUM>. A third area <NUM> of the indoor space <NUM> may correspond to the third outlet 124c of the air conditioner <NUM>. A fourth area <NUM> of the indoor space <NUM> may correspond to the fourth outlet 124d of the air conditioner <NUM>. A fifth area <NUM>, which is located to the left of the second area <NUM> of the indoor space <NUM>, may correspond to the second outlet 124b of the air conditioner. A sixth area <NUM>, which is located to the right of the fourth area <NUM>, may correspond to the fourth outlet 124d of the air conditioner <NUM>. A seventh area <NUM>, surrounded by the first area <NUM> to the fourth area <NUM> of the indoor space <NUM>, may correspond to the first outlet 124a to the fourth outlet 124d of the air conditioner <NUM>.

In one embodiment of the present invention, the indoor space <NUM> may further include an area located in front of the first area <NUM> of the indoor space <NUM> and/or an area located behind the third area <NUM> of the indoor space. In this case, the area located in front of the first area <NUM> may correspond to the first outlet 124a of the air conditioner <NUM>, and the area located behind the third area <NUM> may correspond to the third outlet 124c of the air conditioner.

By controlling the operation of the airflow direction control unit <NUM>, the controller <NUM> may control airflow directions of air flowing toward the indoor space <NUM> for the respective corresponding areas. For example, by controlling the vane motor of the airflow direction control unit <NUM>, the controller <NUM> may generate an airflow of air flowing toward the first area <NUM> as a vertical airflow perpendicular to the ground, and an airflow of air flowing toward the second area <NUM> as a horizontal airflow horizontal to the ground. In this case, an inclination angle formed by the vanes <NUM> and <NUM> disposed at the first outlet 124a may be different from an inclination angle formed by the vanes <NUM> and <NUM> disposed at the second outlet 124b.

<FIG> are flowcharts illustrating a method of operating an air conditioner according to an embodiment of the present invention.

Referring to <FIG>, the air conditioner <NUM> may acquire an image corresponding to a predetermined indoor space by using the camera <NUM> in operation S910. For example, by processing a signal output from the image sensor included in the camera <NUM>, the air conditioner <NUM> may acquire the image corresponding to the indoor space.

In operation S920, the air conditioner <NUM> may process the image corresponding to the indoor space and captured by the camera <NUM>. For example, the air conditioner <NUM> may remove noise from the image corresponding to the indoor space, or may perform signal processing on the image, such as color correction, color enhancement, and the like. For example, the air conditioner <NUM> may detect an object included in the image corresponding to the indoor space, by using a support vector machine (SVM) algorithm and the like.

In operation S930, the air conditioner <NUM> may determine whether a predetermined number or more of images are acquired. Here, the predetermined number may refer to a minimum number of images for calculating the motion of an object present in an indoor space.

If the number of obtained images is less than the predetermined number, the air conditioner <NUM> may repeatedly perform an operation of obtaining images corresponding to the indoor space by using the camera <NUM> and processing the obtained images. For example, the air conditioner <NUM> may repeatedly acquire images corresponding to the indoor space by using the camera <NUM> during a predetermined period of time, and may process the images acquired during the predetermined period of time and may store the processed images in the memory <NUM>.

In operation S940, upon acquiring the predetermined number or more of the images, the air conditioner <NUM> may calculate an activity level of an occupant present in the indoor space based on the images.

Referring to <NUM> of <FIG>, the air conditioner <NUM> may acquire the predetermined number or more of images. The predetermined number or more of images may be processed by the controller <NUM> and may be stored in the memory <NUM>. The air conditioner <NUM> may detect the respective objects included in the predetermined number or more of images.

Referring to <NUM> of <FIG>, the air conditioner <NUM> may detect motion of the objects included in the predetermined number or more of the images. For example, the air conditioner <NUM> may calculate motion vectors for pixels of the objects detected in the predetermined number or more of images by using a dense optical flow method, and may calculate the motion of the objects based on the calculated motion vectors.

Referring to <NUM> of <FIG>, the air conditioner <NUM> may detect an activity level of objects <NUM> to <NUM> detected in the predetermined number or more of the images. For example, the air conditioner <NUM> may determine the activity level of a first object <NUM> by using a value obtained by dividing a sum of magnitudes of the motion vectors for pixels included in the first object <NUM> by the number of the pixels included in the first object <NUM>.

In this case, even when the occupant moves in place, the magnitudes of the motion vectors for the plurality of pixels of the object are accumulated according to the movement of the occupant, such that the air conditioner <NUM> may accurately determine the activity level of the occupant.

The air conditioner <NUM> may determine an activity level for each of a plurality of corresponding areas of the indoor space. For example, if an occupant stays in a specific area among the plurality of areas of the indoor space, an activity level of the occupant, which is determined by the air conditioner <NUM>, may be matched to the specific area in which the occupant is present.

In the case where the occupant moves in the indoor space, the location of an object included in the plurality of images may be changed in each image.

Referring to <FIG> and <FIG>, while an occupant <NUM> moves from a fourth area <NUM> to a sixth area <NUM> in an indoor space <NUM>, the location of the occupant <NUM> may be detected in at least one of the fourth area <NUM> and the sixth area <NUM>. For example, the occupant <NUM> may be detected in the fourth area <NUM> in a first acquired image and may be detected in the sixth area <NUM> in a last acquired image, among a predetermined number or more of images.

In addition, during a predetermined period T when the occupant <NUM> moves from the fourth area <NUM> to the sixth area <NUM>, a magnitude <NUM> of a motion vector calculated for the fourth area <NUM> and a magnitude <NUM> of a motion vector calculated for the sixth area <NUM> may be separated at a time point t1.

In this case, in one embodiment, the air conditioner <NUM> may determine an area, corresponding to the location where the object is detected, in the last acquired image among the predetermined number or more of the images to be an area corresponding to the activity level of the object. For example, the air conditioner <NUM> may determine, as the activity level of the occupant <NUM>, a value obtained by dividing a sum of the magnitudes <NUM> and <NUM> of the motion vectors, calculated while the occupant <NUM> moves from the fourth area <NUM> to the sixth area <NUM>, by the number of pixels constituting the occupant <NUM> in a predetermined image. Furthermore, the air conditioner <NUM> may match the determined activity level of the occupant <NUM> to the sixth area <NUM>, in which the occupant <NUM> is detected in the last acquired image.

In another embodiment, the air conditioner <NUM> may determine the activity level of the object for each area, in which the object is detected, in the predetermined number or more of the images, and may match the activity level of the occupant, which is determined for a specific area, to the specific area.

For example, by using a value obtained by dividing a sum of the magnitudes <NUM> of the motion vectors calculated for the fourth area <NUM> by the number of pixels constituting the occupant <NUM> in a predetermined image, the air conditioner <NUM> may determine the activity level of the occupant <NUM> in the fourth area <NUM>, and may match the determined activity level of the occupant <NUM> to the fourth area <NUM>. In addition, by using a value obtained by dividing a sum of the magnitudes <NUM> of the motion vectors calculated for the sixth area <NUM> by the number of pixels constituting the occupant <NUM> in a predetermined image, the air conditioner <NUM> may determine the activity level of the occupant <NUM> in the sixth area <NUM>, and may match the determined activity level of the occupant <NUM> to the sixth area <NUM>.

The air conditioner <NUM> may determine a total activity level corresponding to all the plurality of areas of the indoor space. For example, upon detecting a plurality of objects in the indoor space, the air conditioner <NUM> may determine the total activity level by using a value, obtained by dividing a sum of magnitudes of motion vectors for all the pixels constituting the plurality of objects by the number of pixels constituting the plurality of objects.

The activity level determined by the air conditioner <NUM> may correspond to metabolic equivalent of task (MET). For example, the air conditioner <NUM> may calculate the MET, corresponding to the activity level, by using a predetermined equation and may determine the activity level based on the calculated MET.

In one embodiment, the air conditioner <NUM> may determine the activity level based on MET data similar to the following Table <NUM>. For example, if the MET is less than <NUM>, the air conditioner <NUM> may determine the activity level to be <NUM>; if the MET is greater than or equal to <NUM> and less than <NUM>, the air conditioner <NUM> may determine the activity level to be <NUM>; if the MET is greater than or equal to <NUM> and less than <NUM>, the air conditioner <NUM> may determine the activity level to be <NUM>; if the MET is greater than or equal to <NUM> and less than <NUM>, the air conditioner <NUM> may determine the activity level to be <NUM>; and if the MET is greater than or equal to <NUM>, the air conditioner <NUM> may determine the activity level to be <NUM>.

Referring to <FIG>, in operation S950, the air conditioner <NUM> may control the airflow direction of air, flowing toward the indoor space, based on the calculated activity level of the occupant present in the indoor space. According to the activity level corresponding to the respective areas of the indoor space, the air conditioner <NUM> may control each airflow direction of the air flowing toward the plurality of areas.

For example, during a cooling operation, if the activity level corresponding to the first to third areas <NUM> to <NUM> is <NUM> or <NUM>, and the activity level corresponding to the fourth area <NUM> is <NUM>, the air conditioner <NUM> may determine an airflow direction of air flowing toward the first to third areas <NUM> to <NUM> to be an indirect airflow, and an airflow direction of air flowing toward the fourth area <NUM> to be a direct airflow. In this case, the air conditioner <NUM> may control the airflow direction control unit <NUM> so that an inclination angle formed by the vanes <NUM> and <NUM> disposed at the first to third outlets 124a to 124c may correspond to the indirect airflow, and an inclination angle formed by the vanes <NUM> and <NUM> disposed at the fourth outlet 124d may correspond to the direct airflow.

For example, during the cooling operation, if the activity level corresponding to the fifth area <NUM> is <NUM>, the air conditioner <NUM> may determine an airflow direction of air flowing toward the fifth area <NUM> to be a diagonal airflow. In this case, the air conditioner <NUM> may control the airflow direction control unit <NUM> so that an inclination angle formed by the vanes <NUM> and <NUM> disposed at the second outlet 124b may correspond to the diagonal airflow.

For example, during the cooling operation, if the activity level corresponding to the sixth area <NUM> is <NUM>, the air conditioner <NUM> may determine an airflow direction of air flowing toward the sixth area <NUM> to be a diagonal airflow and a vertical airflow. In this case, the air conditioner <NUM> may control the airflow direction control unit <NUM> so that an inclination angle formed by the vanes <NUM> and <NUM> disposed at the fourth outlet 124b may be continuously changed between the diagonal airflow and the vertical airflow.

For example, during the cooling operation, if the activity level corresponding to the seventh area <NUM> is <NUM>, the air conditioner <NUM> may determine an airflow direction of air flowing toward the seventh area <NUM> to be a diagonal airflow. In this case, the air conditioner <NUM> may control the airflow direction control unit <NUM> so that inclination angles formed by the vanes <NUM> and <NUM> disposed at the first to fourth outlets 124a to 124b all correspond to the diagonal airflow.

For example, during a heating operation, if the activity level corresponding to the first area <NUM> is <NUM> or <NUM>, and the activity level corresponding to the third area <NUM> is <NUM>, the air conditioner <NUM> may determine an airflow direction of air flowing toward the first area <NUM> to be the direct airflow, and an airflow direction of air flowing toward the third area <NUM> to be the indirect airflow. In this case, the air conditioner <NUM> may control the airflow direction control unit <NUM> so that an inclination angle formed by the vanes <NUM> and <NUM> disposed at the first outlet 124a may correspond to the direct airflow, and an inclination angle formed by the vanes <NUM> and <NUM> disposed at the third outlet 124c corresponds to the indirect airflow.

Further, the air conditioner <NUM> may also adjust the airflow direction of air flowing toward the indoor space based on an airflow predetermined according to user preference. For example, in the case where a user sets an indirect airflow as a preferred airflow during the cooling operation, if an activity level corresponding to the first area <NUM> is greater than or equal to <NUM> and an activity level corresponding to the second to fourth areas <NUM> to <NUM> is <NUM> or <NUM>, the air conditioner <NUM> may determine an airflow direction of air, flowing toward the first area <NUM>, to be the indirect airflow and may determine an airflow direction of air, flowing toward the second to fourth areas <NUM> to <NUM>, to be the direct airflow as an airflow different from the user's preferred airflow. In this case, the air conditioner <NUM> may control the airflow direction control unit <NUM> so that the angle formed by the vanes <NUM> and <NUM> disposed at the first outlet 124a may correspond to the indirect airflow, and the angle formed by the vanes <NUM> and <NUM> disposed at the second to fourth outlets 124b to 124d may correspond to the direct airflow.

In operation S960, the air conditioner <NUM> may control the temperature of the indoor space based on the calculated activity level of the occupant present in the indoor space. The air conditioner <NUM> may control the temperature of the indoor space bases on a total activity level corresponding to all the plurality of areas of the indoor space, which will be described in detail below with reference to <FIG>.

Referring to <FIG>, the air conditioner <NUM> may determine whether a predetermined period of time elapses in operation S1010. Here, the predetermined period of time may refer to a period during which the air conditioner <NUM> determines whether to change a target temperature in order to control the temperature of the indoor space. For example, the air conditioner <NUM> may control the temperature of the indoor space at predetermined five-minute intervals based on the calculated activity level of the occupant present in the indoor space.

If the predetermined period of time has not elapsed, the air conditioner <NUM> may control the temperature of the indoor space according to a current set target temperature.

If the predetermined period of time has elapsed, the air conditioner <NUM> may determine whether a cooling operation is performed in operation S1020.

If the cooling operation is performed, the air conditioner <NUM> may determine whether a total activity level during the predetermined period of time is maintained at a level less than a predetermined level in operation S1030. For example, if the total activity level corresponding to all the plurality of areas during a five-minute period is less than <NUM>, the air conditioner <NUM> may determine that the total activity level during the predetermined period of time is maintained at a level less than the predetermined level.

If the total activity level during the predetermined period of time is maintained at a level less than the predetermined level, the air conditioner <NUM> may set a temperature higher than the existing target temperature as a new target temperature in S1040. That is, if the total activity level during the predetermined period of time is maintained at a level less than the predetermined level, the air conditioner <NUM> may determine that an activity level of the occupant is sufficiently low, and may increase the target temperature to reduce power consumption.

Here, the existing target temperature may refer to a target temperature determined according to a desired temperature set by a user. For example, in the case where a desired temperature set by a user is <NUM>, if cooling performance is at a first level, the air conditioner <NUM> may determine the existing target temperature to be <NUM>, if cooling performance is at a second level, the air conditioner <NUM> may determine the existing target temperature to be <NUM>, and if cooling performance is at a third level, the air conditioner <NUM> may determine the existing target temperature to be <NUM>.

Upon setting a higher temperature than the existing target temperature as a new target temperature, the air conditioner <NUM> may determine the new target temperature based on the determined total activity level during the predetermined period of time. For example, if an average of the total activity levels during the predetermined period of time is less than <NUM>, the air conditioner <NUM> may determine a temperature higher than the existing target temperature by a first temperature (e.g., <NUM>) as the new target temperature; and if an average of the total activity levels during the predetermined period of time is greater than or equal to <NUM>, the air conditioner <NUM> may determine a temperature higher than the existing target temperature by a second temperature (e.g., <NUM>) as the new target temperature.

If the new target temperature, determined based on the total activity level during the predetermined period of time, is greater than or equal to a maximum target temperature (e.g., <NUM>) during the cooling operation, the air conditioner <NUM> may set the maximum target temperature (e.g., <NUM>) as the new target temperature. Alternatively, if the new target temperature, determined based on the total activity level during the predetermined period of time, is greater than or equal to a maximum target temperature (e.g., <NUM>) during the cooling operation, the air conditioner <NUM> may set the existing target temperature as the new target temperature.

The air conditioner <NUM> may control the indoor temperature based on the new target temperature in operation S1050. For example, if a current indoor temperature is lower than the new target temperature by a reference value (e.g., <NUM>) or more, the air conditioner <NUM> may decrease an operating frequency of the compressor <NUM>; and if the current indoor temperature is greater than or equal to the new target temperature by the reference value (e.g., <NUM>) or more, the air conditioner <NUM> may increase an operating frequency of the compressor <NUM>.

During a heating operation, the air conditioner <NUM> may determine whether the total activity level during the predetermined period of time is maintained at a level greater than or equal to the predetermined level in operation S1060. For example, if an average of total activity levels corresponding to the plurality of areas during a five-minute period is greater than or equal to <NUM>, the air conditioner <NUM> may determine that the total activity level during the predetermined period of time is maintained at a level greater than or equal to the predetermined level.

If the total activity level during the predetermined period of time is maintained at a level greater than or equal to the predetermined level, the air conditioner <NUM> may set a temperature lower than the existing target temperature as a new target temperature in operation S1070. That is, if the total activity level is maintained at a level greater than or equal to the predetermined level during the predetermined period of time, the air conditioner <NUM> may determine that the activity level of an occupant is sufficiently high and may lower the target temperature to reduce power consumption.

Here, the existing target temperature may refer to a target temperature determined according to a desired temperature set by a user. For example, in the case where a desired temperature set by a user is <NUM>, if heating performance is at a first level, the air conditioner <NUM> may determine the existing target temperature to be <NUM>, if heating performance is at a second level, the air conditioner <NUM> may determine the existing target temperature to be <NUM>, and if heating performance is at a third level, the air conditioner <NUM> may determine the existing target temperature to be <NUM>.

When setting a temperature lower than the existing target temperature as the new target temperature, the air conditioner <NUM> may determine the new target temperature based on the total activity level determined during the predetermined period of time. For example, if an average of the total activity levels during the predetermined period of time is less than <NUM>, the air conditioner <NUM> may determine a temperature lower than the existing target temperature by a first temperature (e.g., <NUM>) as the new target temperature; and if an average of the total activity levels during the predetermined period of time is greater than or equal to <NUM>, the air conditioner <NUM> may determine a temperature lower than the existing target temperature by a second temperature (e.g., <NUM>) as the new target temperature.

If the new target temperature, determined based on the total activity level during the predetermined period of time, is lower than a minimum target temperature (e.g., <NUM>) during the heating operation, the air conditioner <NUM> may set the minimum target temperature (e.g., <NUM>) as the new target temperature. Alternatively, if the new target temperature, determined based on the total activity level during the predetermined period of time, is lower than the minimum target temperature (e.g., <NUM>) during the heating operation, the air conditioner <NUM> may set the existing target temperature as the new target temperature.

The air conditioner <NUM> may control the indoor temperature based on the new target temperature in operation S1080. For example, if a current indoor temperature is higher than the new target temperature by a reference value (e.g., <NUM>) or more, the air conditioner <NUM> may decrease an operating frequency of the compressor <NUM>; and if the current indoor temperature is lower than the new target temperature by the reference value (e.g., <NUM>) or more, the air conditioner <NUM> may increase an operating frequency of the compressor <NUM>.

If the total activity level during the predetermined period of time is greater than or equal to the predetermined level during the cooling operation of the air conditioner <NUM>, or if the total activity level during the predetermined period of time is less than the predetermined level during the heating operation the air conditioner <NUM>, the air conditioner <NUM> may control the indoor temperature based on the existing target temperature in operation S1090. In this case, the predetermined level used as a reference for determining the total activity level during the cooling operation may be the same as or different from the predetermined level used as a reference for determining the total activity during the heating operation.

Referring to <FIG>, the air conditioner <NUM> may perform the cooling operation based on an indoor temperature <NUM>, a variable target temperature <NUM>, and operating temperatures <NUM> and <NUM> set according to the existing target temperature.

Upon initiating the cooling operation, the air conditioner <NUM> may set the existing target temperature according to the desired temperature set by a user. For example, if the desired temperature set by the user is <NUM>, the air conditioner <NUM> may set the existing target temperature to <NUM>. In this case, each of the operating temperatures <NUM> and <NUM> may be set to be different from the determined existing target temperature by a predetermined temperature value (e.g., <NUM>).

The air conditioner <NUM> may perform the cooling operation so that the indoor temperature <NUM> reaches the existing target temperature. In this case, the air conditioner <NUM> may increase a cooling capacity to a maximum level, so that at an initial stage after the cooling operation is initiated, the indoor temperature <NUM> may rapidly reach the existing target temperature. For example, at the initial stage after initiating the cooling operation, the air conditioner <NUM> may increase the operating frequency of the compressor <NUM> to a predetermined maximum frequency.

In the case where the indoor temperature <NUM> reaches a first operating temperature <NUM>, the air conditioner <NUM> may lower the cooling capacity. For example, the air conditioner <NUM> may lower the operating frequency of the compressor <NUM> starting from a first time point t1 when the indoor temperature <NUM> reaches the first operating temperature <NUM>.

In the case where the indoor temperature <NUM> reaches a second operating temperature <NUM>, the air conditioner <NUM> may lower the operating frequency of the compressor to a predetermined minimum frequency.

If a stabilization stage is satisfied in which an airflow and/or temperature is maintained at a predetermined level during a predetermined period T1 from the first time point t1 at which the indoor temperature <NUM> reaches the first operating temperature <NUM>, the air conditioner <NUM> may activate a power saving mode based on the total activity level of an occupant, and starting from a time point t2 at which the power saving mode is activated, the air conditioner <NUM> may perform the cooling operation based on the total activity level of the occupant.

Starting from the time point t2 at which the power saving mode is activated, the air conditioner <NUM> may acquire images corresponding to the indoor space by using the camera <NUM>. In addition, the air conditioner <NUM> may reset the target temperature at predetermined time intervals T2 according to the total activity level of the occupant calculated based on the acquired images.

For example, if an average of the total activity levels of the occupant which are calculated during a period from the time point t2 to a third time point t3 is less than <NUM>, the air conditioner <NUM> may determine a temperature higher than the existing target temperature <NUM> by a first temperature (e.g., <NUM>) to be a new target temperature, and may control the indoor temperature <NUM> based on the determined new target temperature.

For example, if an average of the total activity levels of the occupant which are calculated during a period from a time point t4 to a fifth time point t5 is greater than or equal to <NUM>, the air conditioner <NUM> may determine a temperature higher than the existing target temperature <NUM> by a second temperature (e.g., <NUM>) to be the new target temperature, and may control the indoor temperature <NUM> based on the determined new target temperature.

Hereinafter, a configuration of an air conditioner <NUM> according to a second embodiment will be described with reference to <FIG>.

The air conditioner <NUM> according to the second embodiment is different from the air conditioner <NUM> according to the first embodiment in terms of a configuration of the airflow direction control unit <NUM>.

Accordingly, a description of components other than the airflow direction control unit <NUM> may be replaced with the above description of the air conditioner <NUM> according to the first embodiment.

The airflow direction control unit <NUM> of the air conditioner <NUM> according to the second embodiment may include one vane <NUM> disposed at each outlet <NUM>, and a vane motor (not shown) for driving the vane <NUM>. An arrangement of the vane <NUM> may be changed by the operation of the vane motor.

Referring to <FIG>, by varying an inclination angle of the vane <NUM> disposed at the outlet <NUM>, the airflow direction control unit <NUM> may control an airflow direction of air flowing through the outlet <NUM>. The vane <NUM> may be disposed so as to close the outlet <NUM> or to adjust the airflow direction of air flowing through the outlet <NUM>.

Referring to <FIG>, the airflow direction control unit <NUM> may be disposed in a first position P1 in which the vane <NUM> is disposed approximately parallel to a virtual horizontal line parallel to a ground. When the airflow direction control unit <NUM> is disposed in the first position P1, the vane <NUM> may form an inclination angle θ of <NUM> degrees or less with respect to a virtual horizontal line HL parallel to the ground. The inclination angle θ, which is formed between the vane <NUM> and the virtual horizontal line HL, may vary according to the arrangement of the vane <NUM>.

Referring to <FIG>, the airflow direction control unit <NUM> may be disposed in a second position P2 in which the vane <NUM> is disposed approximately perpendicular to the horizontal line parallel to the ground. When the airflow direction control unit <NUM> is disposed in the second position P2, the vane <NUM> may form an inclination angle θ of <NUM> degrees or more with respect to the virtual horizontal line HL.

Referring to <FIG>, the airflow direction control unit <NUM> may be disposed in a third position P3 in which the vane <NUM> forms an angle between the first position P1 and the second position P2. When the airflow direction control unit <NUM> is disposed in the third position P3, the vane <NUM> may form an inclination angle θ, ranging from <NUM> degrees to <NUM> degrees, with respect to the virtual horizontal line HL.

When the airflow direction control unit <NUM> is disposed in the first position P1, an indirect airflow is formed so that air, discharged through the outlet, may flow in a direction horizontal to the ground. When the airflow direction control unit <NUM> is disposed in the second position P2, a vertical airflow is formed so that air, discharged through the outlet, may flow in a direction perpendicular to the ground. When the airflow direction control unit <NUM> is disposed in the third position P3, a diagonal airflow may be generated so that the air discharged through the outlet may flow in a direction between the indirect airflow and the vertical airflow.

As illustrated in <FIG>, the air conditioner according to the second embodiment may also cause the air discharged through the outlet <NUM> to flow in the first direction D1, the second direction D2, and the third direction D3 according to the first position P1, the second position P2, and the third position P3 of the airflow direction control unit <NUM>.

Hereinafter, a configuration of an air conditioner according to a third embodiment will be described with reference to <FIG>.

An air conditioner <NUM> according to the third embodiment is different from the air conditioner <NUM> according to the first embodiment in terms of a configuration and an operating structure of the air conditioner and the airflow direction control unit according to the first embodiment, as well as in terms of a shape of an outlet and an arrangement of a vane. Accordingly, a description of components other than the shape of the outlet and the airflow direction control unit may be replaced with the above description of the air conditioner according to the first embodiment.

The air conditioner <NUM> according to the third embodiment may have a plurality of outlets <NUM> formed on an outer circumference of an inlet <NUM>. Here, the inlet <NUM> has a square shape, and the outlets <NUM> may be spaced apart outwardly from each side of the inlet <NUM>. In addition, the inlet <NUM> may also have a circular shape. In this case, there may be a plurality of outlets <NUM> formed at positions spaced apart radially from an outer circumference of the circular inlet <NUM>.

The outlets <NUM> formed at the air conditioner <NUM> according to the third embodiment may have an outer end 324b disposed above an inner end 324a. Further, a discharge passage <NUM> formed over the outlet <NUM> may have a structure extending outwardly from an upper side toward a lower side.

The airflow direction control unit <NUM> of the air conditioner according to the third embodiment may include a vane <NUM> disposed at a panel <NUM> and protruding to the outlet <NUM> with a variable protruding length; a vane motor (not shown) disposed in the panel <NUM> and driving the vane <NUM>; and a vane gear <NUM> rotated by the vane motor and engaged with the vane <NUM> to move the arrangement of the vane <NUM>.

The vane <NUM> may have one end engaged with the vane gear <NUM> in a rack gear structure.

The vane <NUM> may be disposed at the inner end 324a of the outlet <NUM>. The vane <NUM> may protrude outwardly from the inner end 324a of the outlet <NUM>. The protruding length of the vane <NUM> that protrudes to the outlet <NUM> may be changed by the operation of the vane motor.

The airflow direction control unit <NUM> may control an airflow direction of air, flowing through the outlet <NUM>, according to the protruding length of the vane <NUM> that protrudes to the outlet <NUM>.

Referring to <FIG>, by varying the protruding length of the vane <NUM> that protrudes to the outlet <NUM>, the airflow direction control unit <NUM> may control the airflow direction of the air flowing through the outlet <NUM>.

Referring to <FIG>, the airflow direction control unit <NUM> may be disposed in a first position P1 in which the vane <NUM> protrudes to the outlet <NUM> to a maximum length. When the airflow direction control unit <NUM> is disposed in the first position P1, the vane <NUM> may protrude to a maximum allowable length. Accordingly, when the airflow direction control unit <NUM> is disposed in the first position P1, the air flowing through the outlet <NUM> may be guided in a direction horizontal to the ground. When the airflow direction control unit <NUM> is disposed in the first position P1, the vane <NUM> is arranged below the outer end 324b of the outlet <NUM>, such that the air discharged through the outlet <NUM> may flow along the vane <NUM> in the direction horizontal to the ground.

Referring to <FIG>, the airflow direction control unit <NUM> may be disposed in a second position P2 in which the vane <NUM> does not protrude to the outlet <NUM>. When the airflow direction control unit <NUM> is disposed in the second position P2, the vane <NUM> may be disposed so as not to be exposed to the outlet <NUM>. Accordingly, when the airflow direction control unit <NUM> is disposed in the second position P2, the air flowing through the discharge passage <NUM> may be discharged through the outlet <NUM> in a direction approximately perpendicular to the ground. However, depending on a shape of the discharge passage <NUM>, a portion of the air flowing through the outlet <NUM> may also flow flows diagonally to the ground.

Referring to <FIG>, the airflow direction control unit <NUM> may be disposed in a third position P3 in which the vane <NUM> protrudes to a length shorter than the protruding length of the vane <NUM> when the airflow direction control unit <NUM> is disposed in the first position P1. When the airflow direction control unit <NUM> is disposed in the third position P3, the vane <NUM> may protrude to a length longer than the protruding length of the vane <NUM> that protrudes to the outlet <NUM> when the airflow direction control unit <NUM> is disposed in the second position P2. When the airflow direction control unit <NUM> is disposed in the third position P3, the vane <NUM> may protrude to a length which is <NUM>/<NUM> to <NUM>/<NUM> of the protruding length of the vane <NUM> that protrudes to the outlet <NUM> when the airflow direction control unit <NUM> is disposed in the second position P2.

When the airflow direction control unit <NUM> is disposed in the first position P1, an indirect airflow may be formed so that the air discharged through the outlet may flow in a direction horizontal to the ground. When the airflow direction control unit <NUM> is disposed in the second position P2, a vertical airflow may be formed so that the air discharged through the outlet may flow in a direction perpendicular to the ground. When the airflow direction control unit <NUM> is disposed in the third position P3, a diagonal airflow may be formed so that the air discharged through the outlet may flow in a direction between the indirect airflow and the vertical airflow.

As illustrated in <FIG>, the air conditioner according to the third embodiment may also cause the air discharged through the outlet <NUM> to flow in the first direction D1, the second direction D2, and the third direction D3 according to the first position P1, the second position P2, and the third position P3 of the airflow direction control unit <NUM>.

Hereinafter, a configuration of an air conditioner according to a fourth embodiment will be described with reference to <FIG>.

An air conditioner <NUM> according to the fourth embodiment is different from the air conditioner <NUM> according to the first embodiment in terms of a configuration of the air conditioner <NUM> and the airflow direction control unit according to the first embodiment. In the air conditioner according to the fourth embodiment, an inlet <NUM> has a circular shape, and an outlet <NUM> is formed in an annular shape around the inlet <NUM>.

An airflow direction control unit <NUM> of the air conditioner according to the fourth embodiment may include an airflow direction control fan <NUM> disposed on one side of the outlet <NUM>. The airflow direction control unit <NUM> may include a motor <NUM> for rotating the airflow direction control fan <NUM>. The airflow direction control fan <NUM> may be disposed on one side in a direction where the inlet <NUM> is disposed and in a region where the outlet <NUM> is formed, and may adjust an airflow direction of air discharged through the outlet <NUM>. The airflow direction control fan <NUM> may be disposed on one side of the outlet <NUM> to adjust an airflow direction of air discharged through the outlet <NUM>. A plurality of airflow direction control fans <NUM> may be formed in an annular circumferential direction where the outlet <NUM> is formed.

The airflow direction control fan <NUM> may draw in ambient air around the outlet <NUM> to change pressure, thereby adjusting the airflow direction of the air flowing to the outlet <NUM>. The airflow direction control fan <NUM> may control an amount of the drawn ambient air around the outlet <NUM>.

By regulating the rotational speed of the airflow direction control fan <NUM> or by stopping the airflow direction control fan <NUM>, the airflow direction control unit <NUM> may control the airflow direction of the air discharged through the outlet <NUM>. When the airflow direction control fan <NUM> stops, the air flowing to the outlet <NUM> is affected by a shape of the discharge passage <NUM> and an opening direction of the outlet <NUM>. Accordingly, when the airflow direction control fan <NUM> stops, the air flowing through the outlet <NUM> may be discharged in a direction perpendicular to the ground.

However, when the airflow direction control fan <NUM> is operated, a portion of the air discharged through the outlet <NUM> is affected by the airflow direction control fan <NUM>, such that the air discharged through the outlet <NUM> may flow diagonally in a direction horizontal to the ground. In this case, the air flowing to the outlet <NUM> may be controlled based on the amount of air drawn by the airflow direction control fan <NUM>. When the rotational speed of the airflow direction control fan <NUM> increases, the amount of air drawn by the airflow direction control fan <NUM> increases, thereby causing the air to flow in a direction parallel to the ground.

Referring to <FIG>, the airflow direction control unit <NUM> may control the airflow direction of the air discharged through the outlet <NUM> by controlling the operation or rotational speed of the airflow direction control fan <NUM>.

Referring to <FIG>, the airflow direction control unit <NUM> may rotate at a first setting speed for rotating the airflow direction control fan <NUM> at a maximum rotating speed. By rotating at the first setting speed, the airflow direction control unit <NUM> may generate an indirect airflow for causing the air discharged through the outlet to flow in a direction horizontal to the ground.

Referring to <FIG>, the airflow direction control unit <NUM> may rotate at a second setting speed for rotating the airflow direction control fan <NUM> at a minimum rotating speed or stopping the airflow direction control fan <NUM>. Here, the second setting speed corresponds to a speed including a "zero" speed. Accordingly, the second setting speed of the airflow direction control unit <NUM> may include a state in which the airflow direction control fan <NUM> stops. By rotating at the second setting speed, the airflow direction control unit <NUM> may generate a vertical airflow for causing the air discharged through the outlet to flow in a direction perpendicular to the ground.

Referring to <FIG>, the airflow direction control unit <NUM> may rotate at a third setting speed for rotating the airflow direction control fan <NUM> at a rotating speed ranging between the first setting speed and the second setting speed. By rotating at the third setting speed, the airflow direction control unit <NUM> may generate a diagonal airflow for causing the air discharged through the outlet to flow in a direction between the indirect airflow and the vertical airflow.

By rotating at the first rotating speed which is the maximum speed, the airflow direction control unit <NUM> may generate an indirect airflow for causing the air discharged through the outlet to flow in a direction horizontal to the ground. By rotating at the second rotating speed for rotation at the minimum speed or stopping, the airflow direction control unit <NUM> may generate a vertical airflow for causing the air discharged through the outlet to flow in a direction perpendicular to the ground. By rotating at the third rotating speed corresponding to a speed between the first rotating speed and the second rotating speed, the airflow direction control unit <NUM> may generate a diagonal airflow for causing the air discharged through the outlet in a direction between the indirect airflow and the vertical airflow.

As illustrated in <FIG>, the air conditioner according to the fourth embodiment may also cause the air discharged through the outlet <NUM> to flow in the first direction D1, the second direction D2, and the third direction D3 according to the first position P1, the second position P2, and the third position P3 of the airflow direction control unit <NUM>.

The method of operating the air conditioner according to the embodiments of <FIG> may also be applied to the air conditioner according to the above second to fourth embodiments of the present invention.

The attached drawings are provided to help easy understanding of the embodiments of the present invention, not limiting the scope of the present invention. Thus, it is to be understood that the present invention covers all modifications, and/or alternatives falling within the scope of the present invention as claimed.

In certain circumstances, multitasking and parallel processing are advantageous.

Claim 1:
An air conditioner comprising:
a case (<NUM>) having a space formed therein;
an inlet (<NUM>) and a plurality of outlets (<NUM>) facing in different directions of the case (<NUM>);
a fan (<NUM>) disposed in the case (<NUM>) and configured to generate an airflow from the inlet (<NUM>) to the plurality of outlets (<NUM>);
an airflow direction control unit (<NUM>) disposed at the respective outlets (<NUM>) and configured to control an airflow direction of air flowing through the respective outlets (<NUM>);
a camera (<NUM>) directed toward an indoor space (<NUM>); and
a controller (<NUM>) configured to control the airflow direction control unit (<NUM>) based on a plurality of images corresponding to the indoor space (<NUM>) and captured by the camera (<NUM>),
wherein the controller (<NUM>) is configured to:
calculate a motion vector for a plurality of pixels constituting an occupant and included in the plurality of images;
determine an activity level of an occupant for a plurality of areas (<NUM> - <NUM>) of the indoor space (<NUM>) based on the images corresponding to the indoor space (<NUM>), wherein the activity level of the occupant is determined based on a value obtained by dividing a sum of magnitudes of motion vectors for the plurality of pixels, which are calculated for the plurality of images, by a number of the pixels;
determine a direction of air discharged from the respective outlets (<NUM>) based on the determined activity level; and
control the airflow direction control unit (<NUM>) according to the direction of the air which is determined for the respective outlets (<NUM>).