COOLING AIR SUPPLY CONTROL APPARATUS OF REFRIGERATOR AND CONTROL METHOD THEREOF

Abstract: The present invention relates to a cooling air supply control apparatus of a refrigerator and a control method thereof for controlling discharge quantity and discharge direction of cooling air by way of an eccentric damper (27), thereby maintaining stably the temperature in the refrigerating chamber (5) to a maximum, the apparatus including a keyboard (38) for operating keys so that a user can select a desired operation mode; a plurality of thermistors (31, 32, 33, 34) for detecting the temperatures in the refrigerating chamber (5); a controller (42) for controlling a cooling operation of the refrigerator according to temperature difference in the chamber (5) detected by an operation mode selected by the keyboard (38) and the thermistors (31, 32, 33, 34); a stepping motor driving unit (46) for driving a stepping motor (26) so that an eccentric damper (27) can be rotated according to the control of the controller (42); a reed switch for detecting a position of the eccentric damper (27) in the course of driving of the stepping motor (26) according to an output signal of the stepping motor driving unit (46) to thereby output the same to the controller (42); and a fan motor driving unit (44) for driving a fan motor (14) in order to maintain the temperature in the chamber (5) at a predetermined constant level according to the control of the controller (42).

Description: SPECIFICATION COOLING AIR SUPPLY CONTROL APPARATUS OF REFERIGERATOR AND CONTROL METHOD THEREOF FIELD OF THE INVENTION The present invention relates to a cooling air supply control apparatus of a refrigerator and a control method thereof, which can adjust discharge amount and discharge direction of cooling air in order to stably maintain temperature in the refrigerator to a maximum regardless of opening and/or closing of a door thereof and existence of high temperature food. BACKGROUND OF THE INVENTION Generally, the temperature in a conventional refrigerator is detected by a temperature sensor disposed at a predetermined position therein, and if the detected temperature in the refrigerator is above a temperature pre-established in a microcomputer, a compressor therein is driven, and at the same time, a damper is opened, thereby causing the cooling air to be discharged through a plurality of discharge ports arranged in a refrigerating chamber, freezing chamber, vegetable chamber or the like, so that the temperature therein can be lowered. Meanwhile, if the temperature detected by the temperature sensor is lower than the temperature pre-extablished in the microcomputer, driving of the compressor is caused to stop, and at the same time, the damper is caused to colsed, thereby preventing the temperature in the refrigerating chamber, freezing chamber, vegetable chamber or the like from being excessively lowered. As a prior art, Japanese laid open utility model No. Sho 63-10392 published on August 13, 1990, discloses a cooling air circulation apparatus, where the cooling air is discharged at a stretch toward top sides of the chambers from air holes formed at a front side of a blowing apparatus. Part of the cooling air discharged through the air holes is streamed down to a front area of an inner door from a top area of the inner door disposed at an uppermost top front area thereof, and the same time, is flowed into the refrigerating chamber or vegetable chamber from air holes provided in front of the refrigerating chamber and vegetable chamber. Furthermore, part of the cooling air is streamed down through a gap formed between a food shelf and a lower side of the inner door, and part of the cooling air discharged toward an inner upper area of the chamber is flowed down through a gap formed between inner frosts formed behind the food shelf. An opening unit at a suction side of a cooling air route for re-circulating the cooling air whose temperature has been increased by absorbing heat from the food stored in the chamber is formed at a rear portion of a floor unit in the refrigerating chamber. However, in the conventional refrigerator thus constructed, there is a problem in that because a predetermined amount of the cooling air is discharged to a predetermined direction regardless of temperature changes in the refrigerating chamber, freezing chamber or in the vegetable chamber, the temperature in the chambers cannot be maintained at a constant level, thereby causing degradation of degree of freshness of the food disposed at an area where the cooling air is not smoothly circulated, and at the same time, lots of time is consumed in order to maintain at a predetermined level an overall temperature in the chambers when hot food is stuffed thereinto, thereby causing an increase of electric power consumption. SUMMARY OF THE INVENTION Accordingly, the present invention is disclosed to solve the aforementioned problems, and it is an object of the present invention to provide a cooling air supply control apparatus of a refrigerator and a control method thereof by which an eccentric damper for adjusting discharge amount and discharge direction of the cooling air is controllably driven to thereby cause the cooling air to be partially discharged or discharged to the left or right side or maintenance of the temperature in the chambers at a predetermined constant level, and at the same time, the overall temperatures in all the chambers is maintained constant within a shortest possible time by concentratively cooling an area where the hot food is placed even though the hot food is put into the chambers, to thereby reduce the power consumption and temperature variation rate in the chambers. It is another object of the present invention to provide a cooling air supply control apparatus of a refrigerator and a control method thereof by which an eccentric damper is controllably driven by a stepping motor for being driven by a control of control means, to not only cool a particular area concentratively but also to cool overall inner areas of the chambers within a shortest possible time and to thereby maintain overall inner temperatures of the chambers at predetermined constant levels. In accordance with one aspect of the present invention, there is provided a cooling air supply control apparatus of a refrigerator, the apparatus comprising: Key operation means for operating keys so that a user can select a desired operation mode; temperature detecting means for detecting temperatures in the refrigerating chamber; control means for controlling a cooling operation of the refrigerator according to temperature difference in the chamber detected by an operation mode selected by the key operation means and the temperature detecting means; stepping motor driving means for driving a stepping motor so that an eccentric damper can be rotated according to the control of the control means; ; a reed switch for detecting a position of the eccentric damper in the course of driving of the stepping motor according to an output signal of the stepping motor driving means to thereby output the same to the control means; and fan motor driving means for driving a fan motor in order to maintain the temperature in the chamber at a predetermined constant level according to the control of the control means. In accordance with another aspect of the present invention, there is provided a cooling air supply control method of a refrigerator, the method comprising the steps of: discriminating a present position of the eccentric damper; driving the fan motor to quickly cool the refrigerating chamber according to the present position of the eccentric damper when a cooling mode in the refrigerating chamber is selected as integrated cubic cooling by the operation of the key operation means; cooling concentratively a particular area of comparatively higher temperature in the refrigerating chamber according to a temperature difference in the refrigerating chamber when the mode in the refrigerating chamber is selected as concentrated cooling by the operation of the key operation means; and reciprocating swingingly the eccentric damper to the left and to the right according to the control of the control means to thereby maintain the temperature in the refrigerating chamber at a predetermined constant level when the cooling mode in the refrigerating chamber is selected as automatic swing by the operation of the key operation means. According to the cooling air supply control apparatus of a refrigerator and a method thereof thus described, the cooling air discharge quantity and discharge direction are controlled by the stepping motor drive according to adjustment of the control of the eccentric damper, to thereby enable the cooling air to be discharged partially or discharged to the left and to the right in a swing style, so that the temperature in the chamber can be maintained at a predetermined constant level, and a concentrated cooling of a particular area where hot food is placed can decrease time necessary for maintaining the temperature in the refrigerating chamber at a predetermined constant level, to thereby reduce consumption of electric power. Furthermore, according to the present invention the eccentric damper is controlled by the control means to thereby carry out a concentrated cooling on a particular area, and at the samt time, to rapidly cool whole areas within the chambers and to maintain the temperatures in the chambers at a predetermined constant level. In the above description, the eccentric damper represents a damper which is eccentrically disposed at a rotating shaft of the stepping motor to thereby close or open a cooling air discharge outlet for control of discharge quantity and discharge direction of the cooling air. BRIEF DESCRIPTION OF THE INVENTION For fuller understanding of the nature and objects of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings in which: Figure 1 is a side sectional view of a refrigerator according to one embodiment of the present invention. Figure 2 is a front view of the refrigerator removed of a door at Figure 1; Figure 3 is a sectional view at A-A' portion in Figure 2; Figure 4 is a control block diagram of a cooling air supply control apparatus of the refrigerator according to the embodiment of the present invention; Figure 5 is a flow chart for illustrating an operational sequence of a cooling air supply control in the refrigerator according to the embodiment of the present invention; Figure 6. is a flow chart for illustrating an operational sequence of a cubic cooling air supply control in the refrigerator according to the embodiment of the present invention; Figure 7 is a flow chart for illustrating an operational sequence of a concentrated cooling air supply control in the refrigerator according to the embodiment of the present invention; ; Figure 8 is a flow chart for illustrating an operational sequence of an automatic swing control in the refrigerator according to the embodiment of the present invention; and Figure 9 is a plan view for illustrating a position of an eccentric damper in a cooling air supply control of the refrigerator according to the embodiment of the present invention DETAILED DESCRIPTION OF THE INVENTION The embodiment of the present invention will now be described in detail with reference to the accompanying drawings. As illustrated in Figures 1, 2 and 3, a freezing chamber 3 a refrigerating chamber 5 and a vegetable chamber 7 for storing cold food and refrigerated food, constitute together a body 1 for forming therein as an enclosure of the refrigerator. The body 1 is mounted at a facade thereof with respective doors 8 and 10 for storing the food in the freezing chamber 3 and the refrigerating chamber 5 or for taking out the stored food. The freezing chamber 3 is arranged at a rear surface thereof with an evaporator 12 for heat-exchanging the hot air in the chambers so that the cooling air can be supplied into the freezing chamber 3, refrigerating chamber 5 and the vegetable chamber. The evaporator 12 is rotatatively provided at a rotating shaft of a fan motor 14 with a fan 14a for circulating the cooling air which has been cooled by the heat-exchange at the evaporator 12 into the freezing chamber 3, refrigerating chamber 5 and the vegetable chamber 7. The refrigerating chamber 5 is divided therein into a plurality of inner spaces and is mounted therein with a plurality of shelves so that the food can be placed thereon. Furthermore, the body 1 is disposed thereunder with a compressor 18 for compressing refrigerant of low temperature and of lower pressure generated by an evaporating operation of the evaporator 5. The freezing chamber 3 and the refrigerating chamber 5 are formed at rear areas thereof with a duct 20 for guiding and supplying the cooling air generated by the evaporator 12 into the freezing chamber 3 and the refrigerating chamber 5 by way of the fan 14a rotating according to a driving of the fan motor 14. The refrigerating chamber 5 is formed at a rear wall surface thereof with cooling air discharge outlets (23a-23e), (24a-24e) and (25a-25e) for discharging into the refrigerating chamber 5 the cooling air for flowing through the duct 20 by being heat-exchanged at the evaporator 12. The cooling air discharge outlets 23c, 24c and 25c are rotatatively disposed with an eccentric damper 27 for adjusting the discharge quantity and the discharge direction of the cooling air discharged into the refrigerating chamber 5 through the cooling air discharge outlets (23a-23e), (24a-24e) and (25a-25e). The eccentric damper 27 opens and/or closes the cooling air discharge outlets (23a-23e), (24a-24e) and (25a-25e) according to control of control means 42. The eccentric damper 27 is mounted at a rotating shaft 26a of a stepping motor 26 in order to close and/or open the cooling air discharge outlets (23a-23e), (24a-24e) and (25a-25e) according to the control of the control means 42. The stepping motor 26 is attached at a shaft 26a thereof with a reed switch 28 for detecting a position of the eccentric damper 27 as illustrated in Figure 3. The refrigerating chamber 5 is arranged therein with temperature detecting means comprising a plurality of thermistors 31, 32, 33 and 34 in order to detect temperatures in respective parts, namely, temperautres in upper left and upper right parts and temperatures in lower left and lower right parts. The refrigerator thus constructed, as illustrated in Figure 4, receives from direct current power means 36 a commercial alternating current (AC) voltage of an alternating current power input terminal and convert the same to a direct current (DC) voltage necessary for driving the refrigerator and thereafter output the same. Key operating means 20 selects operation modes (cubic cooling, concentrated cooling, automatic swing operation and the like) desired by a user. The temperature detecting menas 40 including the theremistors 31, 32, 33 and 34 detects the temperatures in the upper left, upper right, lower left and lower right sides in the refrigerator 5 to thereafter output the same to control means 42. In the aforesaid description, the control means 42 denotes a microcomputer which receives the DC voltage supplied from the DC power means 36 to thereby initialize the refrigerator, and at the same time, control an overall cooling operation of the refrigerator according to a temperature difference AT in the chamber detected by the temperature detecting means 40 and by the operation mode selected by the key operation means 38. Furthermore, fan motor driving means 44 receives a control signal generated from the control means 42 to drive the fan motor 14 and to rotate the fan 14a so that the cooling air which has been cooled by being heat-exchanged at the evaporator 12 can he circulated. Stepping motor driving means 46 receives the control signal of the control means according to the temperature difference AT in the chamber detected by the temperature detecting means 40 and by the operation mode selected by the key operation means 38, to thereby controllably drive the stepping motor 26 for rotating the eccentric damper 27 so that the cooling air discharge outlets (23a-23e), (24a-24e) and (25a-25e) can be closed and opened. The read switch 28 denotes a switch for detecting a position of the eccentric damper 27 for being rotated in cooperation with rotation of the stepping motor 26 according to a control of the stepping motor driving means 46. An on/off signal of the reed switch is received at the control means 42 to thereby discriminate the position of the eccentric damper 27. Now, a cooling air supply control method of the refrigerator thus constructed will be described. First of all, a control sequence of the refrigerator for changing according to the operation mode selected by the key operation means 38 will be described with reference to Figure 5. Figure 5 is a flow chart for illustrating operational procedures of a cooling air supply control in the refrigerator employing the eccentric damper 27 according to the present invention. Reference symbol S in Figure 5 represents steps. First of all, when the user applies the electric power to the refrigerator, the DC power means 36 receives the commercial AC power supplied from the AC power input terminal (not shown) and converts the same to a DC voltage necessary for driving of the refrigerator and outputs the same to respective driving means and control means 42. Accordingly, at step S1, the control means 42 receives the DC voltage supplied from the DC power means 36 to thereby initialize the refrigerator according to a cooling air supply control function. The flow now proceeds to step S2, to thereby discriminate whether a condition in the chamber is the one for controlling the eccentric damper 27. As a result of the discrimination at step S2, if the condition is not for controlling the damper 27 (in case of No), the flow returns back to step S1 and repeats operations subsequent to step S1. As a result of the discrimination at step S2, if the condition is for controlling the eccentric damper 27 (in case of Yes), the flow advances to step S3 to ascertain a present position of the eccentric damper 27 and causes the control means 42 to output the control signal to the stepping motor driving means 46. Accordingly, the stepping motor driving means 46 drives the stepping motor 26 according to the control of the control means 42 and controls to rotate the eccentric damper 27 in a predetermined direction at a predetermined speed. The flow now proceeds to step S4, and discriminates whether or not the reed switch 28 has changed from On to OFF during rotation of the eccentric damper 27. As a result of the discrimination at step S4, if the reed switch 28 has not changed from ON to OFF (in case of No), the flow proceeds to step S5, and discriminates whether or not the reed switch 28 has changed from OFF to On during the rotation of the eccentric damper 27. As a result of the discrimination at step S5, if the reed switch 28 has not changed from ON to OFF (in case of No), the flow returns back to step S4, and repeats an operation of discriminating whether or not the reed switch 28 has changed from ON to Off at steps subsequent to step S4. Meanwhile, as a result of the discrimination at step S4, if the reed switch 28 has changed from ON to OFF (in case of Yes), and as a result of the discrimination at step S5, if the reed switch 28 has changed from OFF to ON (in case of Yes), the flow advances to step S6, to thereby cause the control means 42 to receive a signal coming from the red switch and to discriminate the position of the eccentric damper 27. The flow now proceeds to step S7, and discriminates whether or not the operation mode selected by the key operation means 38 is a cubic cooling operation mode, and if the operation mode is the cubic cooling operation mode (in case of Yes), the control means 42 outputs to the fan motor driving means 44 a control signal for driving the fan motor 14 to thereby drive the fan 14a, and at the same time, outputs to the stepping motor driving means 46 a control signal for driving the stepping motor 26 to thereby drive the stepping motor 26. The eccentric damper 27 is then driven to thereby control the refrigerator by way of the cubic cooling operation mode. As a result of the discrimination at step S7, if the operation mode is not the cubic cooling operation mode (in case of No), the flow advances to step S8, and discriminates whether or not the operation mode selected by the key operation mode 38 is a concentrated cooling operation mode. If the operation mode is the concentrated cooling operation mode (in case of Yes), the control means 42 outputs to the fan motor driving means 44 a control signal for driving the fan motor 14 to thereby drive the fan 14a, and at the same time, outputs to the stepping motor driving means 44 a control signal for driving the stepping motor 26 to thereby drive the stepping motor 26. The eccentric damper 27 is then driven to thereby control the refrigerator by way of the concentrated cooling operation mode. Meanwhile, as a result of the discrimination at step S8, if the operation mode is not the concentrated cooling operation mode (in case of No), the flow advances to step S9, and discriminates whether or not the operation mode selected by the key operation mode 38 is an automatic swing operation mode. If the operation mode is the automatic swing operation mode (in case of Yes), the control means 42 outputs to the fan motor driving means 44 a control signal for driving the fan motor 14 to thereby drive the fan 14a, and at the same time, the stepping motor driving means 46 outputs a control signal for driving the stepping motor 26 to thereby drive the stepping motor 26. The eccentric damper 27 is then driven to thereby control the refrigerator by way of the automatic swing operation mode. As a result of the discrimination at step S9, if the operation mode is not the automatic swing operation mode (in case of No), the flow advances to step S10, and because a control signal has not been output from the control means 42 to the fan motor driving means 44, the fan motor 14 is stopped. At this time, because a signal for driving the stepping motor 26 is being input to the stepping motor driving means 46 from the control means 42, the eccentric damper 27 is rotated according to drive of the stopping motor 26, to close a cooling air route of the duct 20 and to thereby terminate control operation of the refrigerator. Next, a cooling air supply control operation (cubic cooling operation mode, concentrated operation mode, automatic swing operation mode) of a refrigerator performed in accordance with each operation mode selected by the key operation means 38 will be described in detail. First of all, a detailed description will be mode with reference to Figure 6 about a case where the cubic cooling operation mode is selected by the key operation means 38. Figure 6 is a flow chart for illustrating operational sequence of the cubic cooling air supply control of a refrigerator according to the embodiment of the present invention. Reference symbol S in Figure 6 denotes steps. First of all, in case of the cubic cooling air supply control of the refrigerator, a discrimination is made at step S20 as to whether the refrigerator is under an initial power-on state. If the refrigerator is not under the initial power-on state (in case of No), flow proceeds to step S21, and discriminates whether or not a door of the refrigerator has been opened for a long time. As a result of the discrimination at step S21, if the door 10 of the refrigerator 5 has not been opened for a long time (in case of No), the flow advances to step S22, and detects the temperature in the refrigerating chamber 5 by way of the temperature detecting means 40, thereby discriminating whether or not the detected temperature is an abnormal high temperature. Here, the control means 42 compares the temperature in the chamber detected by the temperature detecting means 40 with a maximum reference temperature and according to the comparison thereof, the abnormal high temperature in the chamber can he discriminated. As a result of the discrimination at step S22, if the temperature of the refrigerating chamber 5 discriminated by the control means is not the abnormal high temperature (in case of No), there is then no need to quickly cool the whole inner areas of the chamber and so that cubic cooling mode is now completed. If the temperature in the chamber is the abnormal high temperature (in case of Yes), there is a need to quickly cool the whole inner areas in the chamber, so at step S23, a timer inherently stored in the control means 42 starts to count the cubic cooling time. Meanwhile, as a result of the discrimination at step S20, if the refrigerator is under the initial power-on state (in case of Yes), and as a result of discrimination at step S21, if the door 10 of the refrigerating chamber 5 has been opened for a long time (in case of Yes), there is a need to quickly cool the whole inner areas of the chamber, so flow proceeds to step S23 and starts to count the cubic cooling time. At step S24, a control signal generated from the control means 42 is received by the stepping motor driving means 46 to thereby drive the stepping motor 26, so that the eccentric damper 27 can be reciprocatively swung to the left and to the right, as illustrated in Figure 9H. At step S25, a discrimination is made as to whether or not the eccentric damper 27 is in a position to discharge the cooling air at a "high" level to the left or right side through the cooling air discharge outlets (23a, 24a, 25a) or (23e, 24e, 25e) as illustrated in Figure 9A or 9D after the eccentric damper 27 is swung to the left and to the right sides. As a result of the discrimination at step S25, if the eccentric damper 27 is not in a position to discharge the cooling air at a "high" level to the left or right side through the cooling air discharge outlets (23a, 24a, 25a) or (23e, 24e, 25e) (in case of No), flow advances to step S26. At step S26, if the eccentric damper 27, as illustrated in Figure 9B or Figure 9E, is in a position to discharge to the left the cooling air at an "intermediate" level through the cooling air discharge outlets (23a, 23b) (24a, 24b) (25a, 25b), or to the right through the cooling air discharge outlets (23d, 23e) (24d, 24e) (25d, 25e) (in case of Yes), the cooling air is in a state of being discharged to the left side or right side of the refrigerating chamber 5 at the "intermediate" level. The flow now proceeds to step S26, and at step S26, the fan motor driving means 44 receives a control signal generated from the control means 42 and drives the fan motor 14 with a revolution per minute RPM of the fan motor 14 at an "intermediate" level to thereby drive the fan 14a. Meanwhile, as a result of the discrimination at step S26, if the eccentric damper 27 is not in a position to dischage the cooling air to the left side through the cooling air discharge outlets (23a, 23b) (24a, 24b) (25a, 25b) at the "intermediate" level, or to the right through the cooling air discharge outlets (23d, 23e) (24d, 24e) (25d, 25e) (in case of No), the flow advances to step S27 and discriminates whether or not the eccentric damper 27, as illustrated in Figure 9C or Figure 9E, is in a position to discharge the cooling air to the left side through the cooling air discharge outlets (23a, 23b, 23c) (24a, 24b, 24c) (25a, 25b, 25c) or to the right side through the cooling air discharge outlets (23c, 23d, 23e) (24c, 24d, 24e) (25c, 25d, 25e) at a "low" level. As a result of the discrimination at step S27, if the eccentric damper 27 is in a position to discharge the cooling air to the left through the cooling air discharge outlets (23a, 23b, 23c) (24a, 24b, 24c) (25a, 25b, 25c) or to the right through the discharge outlets (23c, 23d, 23e) (24c, 24d, 24e) (25c, 25d, 25e) at the "low" level (in case of Yes), the cooling air is in a state of being discharged at the "low" level to the left or right side of the refrigerating chamber 5. The flow now proceeds to step S27, and at step 527, the fan motor driving means 44 receives a control signal of the control means 42 to thereby drive the fan motor 14 with the RPM of the fan motor at a "low" level. Meanwhile, as a result of the discrimination at step S27, if the eccentric damper 27 is not in a position to discharge the cooling air to the left side through the cooling air discharge outlets (23a, 23b, 23c) (24a, 24b, 24c) (25a, 25b, 25c) or to the right side through the discharge outlets (23c, 23d, 23e) (24c, 24d, 24e) (25c, 25d, 25e) at the "low" level (in case of No), the cooling air is in a state of being discharge at the "high" level to the left side or right side of the refrigerating chamber 5. The flow proceeds to step S28 and at step S28, the fan driving motor 44 receives a control signal of the control means 40 to thereby drive the fan motor 14 with the RPM of the fan motor 14 at a "high" level. As a result of the discrimination at step S25, if the eccentric damper 27 is in a position to discharge the cooling air at the "high" level to the left through the discharge outlets (23a, 24a, 25a) or to the right through the discharge outlets (23e, 24e, 25e) (in case of Yes), the cooling air is in a state of being discharged to the left or right side of the refrigerating chamber 5 at the "high" level. The flow now proceeds to step S28, and at step S28, the fan motor 14 is driven with the RPM thereof at a "high" level, to thereby cause the fan 14a to rotate rapidly. In other words, the RPM of the fan motor 14 is made at the "high", "intermediate", or "low" level according to the position of the eccentric damper 27, thereby driving the fan motor 14. At step S29, a discrimination is made as to whether the time counted by the timer at step S23 has passed a previously established predetermined time, and if the counted time has not passed the predetermined present time period (in case of No), the flow returns to step S25 and repeats operations subsequent to step 25. Meanwhile, as a result of the discrimination at step S29, if the counted time has passed the predetermined present time period (in case of Yes), the cubic cooling mode is finished. A detailed description about a case where a concentrated cooling operation is selected by the key operation means 38 will be described with reference to Figure 7. Figure 7 is a flow chart for illustrating operating sequence of a concentrated cooling air supply control of a refrigerator according to the embodiment of the present invention and reference symbol S therein denotes steps. First of all, at step S40, temperatures T of respective portions in the refrigerating chamber 5 is detected by the temperature detecting means 40 comprising thermistors 31, 32, 33 and 34 respectively arranged at a lower left side, a lower right side, an upper left side and an upper right side of the refrigerating chamber 5, and the temperature data thus detected are output to the control means 42. Subsequently, at step S41, the temperature data of each portion detected by the thermistors 31, 32, 33 and 34 are compared at the control means 42, to thereby calculate a temperature difference AT in the refrigerating chamber 5. Flow now advances to step S42, and a discrimination is made as to whether the temperature difference AT in the chamber calculated therefrom is larger than a minimum temperature difference ATmin (in other words, the lowest temperature difference for driving the fan motor) previously established at the control means 42. As a result of the discrimination at step S42, if the temperature difference in the chamber AT is not larger than the minimum temperature difference ATmin (in case of No), the flow returns to step S40, and operations subsequent to step S40 are repeatedly carried out. Meanwhile, as a result of the discriminations at step S42, if the temperature difference AT is larger than the minimum temperature difference ATmin (in case of Yes), flow proceeds to step S43, and discriminates whether or not the temperature difference AT is larger than a maximum temperature difference Tmax (in other words, the highest temperature difference for driving the fan motor at a "high9 level) previously established at the control means 42. As a result of the discrimination at step S43, if the temperature difference AT is larger than the maximum temperature difference Tmax (in case of Yes), flow advances to step S44 to thereby cause the control means 42 to output a control signal to the stepping motor driving means 46, so that the cooling air heat-exchanged by the evaporator 12 and guided by the duct 20 can be "intensively" discharged through the discharge outlets (23a, 24a, 25a) or through the discharge outlets (23e, 24e, 25e) to a direction where the temperature in the chamber is high, because the temperature at a particular area in the chamber has risen due to the hot food inserted to the particular area in the refrigerating chamber 5. Accordingly, the stepping motor driving means 46 receives the control signal output from the control means 42 to drive the stepping motor 26 and to thereafter drive the eccentric damper 27, so that the cooling air can be discharged at a "high" level toward the area where the temperature is high through the cooling air discharge outlets (23a, 24a, 25a) or discharge outlets (23e, 24e, 25e) to thereby rotate the eccentric damper 27. Then, at step S45, the fan motor driving means 44 receives the control signal output from the control means 42 to thereby drive the fan motor 14 with the RPM of the fan motor 14 at a "high" level. The temperature in the chamber is caused to go down until the temperature difference AT in the chamber does not become larger than the minimum temperature difference ATmin. The concentrated cooling mode is then terminated. Meanwhile, as a result of the discrimination at step S43, if the temperature difference AT in the chamber is not larger than the maximum temperature difference A Tmax (in case of No), flow proceeds to step S46, to thereby cause the control means 42 to output the control signal to the stepping motor driving means 46 so that the cooling air heat-exchanged by the evaporator 12 and guided by the duct 20 can be discharged to the area where the temperature is high through the cooling air discharge outlets (23a, 23b) (24a, 24h) (25a, 25b) or through the outlets (23d, 23e) (24d, 24e) (25d, 25e). Consequently, the stepping motor driving means 46 receives the control signal output from the control means 42 to thereby drive the stepping motor 26, so that the eccentric damper 27 can be rotated, as illustrated in Figure 9B or Figure 9E, in order to cause the cooling air to be discharged to the area where the temperature is high through the cooling air discharge outlets (23a, 23b) (24a, 24b) (25a, 25b) or through discharge outlets (23d, 23e) (24d, 24e) (25d, 25e). At step S47 the fan motor driving means 44 receives the control signal of the control means 42 while the fan motor 14 is driven with the RPM thereof maintaining at an "intermediate" level, and the temperature in the chamber is kept being lowered until the temperature difference in the chamber AT is no longer larger than the minimum temperature difference Admin. The concentrated cooling mode is then terminated. Next, a case where the automatic swing operation mode is selected according to the key operation means 38 will be described in detail with reference to Figure 8. Figure 8 is a flow chart for illustrating an automatic swing control operation procedure of a refrigerator according to the embodiment of the present invention. First of all, at step S60, the fan motor driving means 44 receives the control signal of the control means 42 to thereby drive the fan motor 14 while the RPM thereof is maintained at an "intermediate" level. The automatic swing operation is then terminated. When the automatic swing operation is completed, the control signal output from the control means is not generated to the stepping motor driving means 46. At this time, because the stepping motor 26 is in a state of stoppage, the eccentric damper 27 is placed at a position illustrated in Figure 91.

Claims: WHAT IS CLAIMED IS 1. A cooling air supply control apparatus of a refrigerator, the apparatus comprising: Key operation means for operating keys so that a user can select a desired operation mode; temperature detecting means for detecting temperatures in a refrigerating chamber; control means for controlling a cooling operation of the refrigerator according to an operation mode selected by the key operation means and a temperature difference in the chamber detected by the temperature detecting means; stepping motor driving means for driving a stepping motor so that an eccentric damper can be rotated according to a control of the control means; a reed switch for detecting a position of the eccentric damper in the course of driving of the stepping motor according to an output signal of the stepping motor driving means to thereby output the same to the control means; and fan motor driving means for driving a fan motor in order to maintain the temperature in the chamber at a predetermined level according to the control of the control means. 2. A cooling air supply control apparatus of a refrigerator as defined in claim 1, wherein the eccentric damper is rotatably disposed at a rotating shaft of the stepping motor so that the cooling air to be discharged to the refrigerating chamber can be controlled in a discharge direction thereof. 3. A cooling air supply control apparatus of a refrigerator as defined in claim 2, wherein the eccentric damper is rotatably disposed at the rotating shaft of the stepping motor so that quantity of the cooling air to be discharged to the refrigerator can be controlled. 4.A cooling air supply control apparatus of a refrigerator as defined in claim 2, wherein the eccentric damper is rotatably disposed at the rotating shaft of the stepping motor so that plurality of the cooling air discharge outlets formed at a rear surface wall of the refrigerating chamber can be opened and/or closed. 5. A cooling air supply control apparatus of a refrigerator as defined in claim 1, wherein the temperature detecting means represents a plurality of thermistors disposed respectively at lower left, lower right, upper left and upper right sides of the the refrigerating chamber. 6. A cooling air supply control method of a refrigerator, the method comprising the steps of: discriminating a present position of the eccentric damper; driving the fan motor to quickly cool the refrigerating chamber according to the present position of the eccentric damper when a cooling mode in the refrigerating chamber is selected as integrated cubic cooling by the operation of the key operation means; cooling concentratively a particular area of comparatively higher temperature in the refrigerating chamber according to a temperature difference in the refrigerating chamber when the mode in the refrigerating chamber is selected as concentrated cooling by the operation of the key operation means; and reciprocating swingingly the eccentric damper to the left and to the right according to the control of the control means to thereby maintain the temperature in the refrigerating chamber at a predetermined constant level when the cooling mode in the refrigerating chamber is selected as automatic swing by the operation of the key operation means. 7. A cooling air supply control method of a refrigerator as defined in claim 6, wherein, at the integrated cubic cooling operation step, revolution per minute of the fan motor is controllably driven at a "high", "intermediate" or "low" level at a present position of the eccentric damper regardless of selection of the integrated cubic cooling by the key operation means when the temperature in the refrigerating chamber is abnormally high due to long period of a door opening. 8. A cooling air supply control method of a refrigerator as defined in claim 6, wherein, at the concentrated cooling operation step, the eccentric damper is controlled in order to concentratively cool an area where the temperature is high according to a temperature difference in the refrigerating chamber regardless of whether or not the concentrated cooling mode is selected by the key operation means when the temperature at a particular area in the refrigerating chamber is high due to placement of hot food and the like in the refrigerating chamber, and at the same time, revolution per minute of the fan motor is controllably driven at a "high" or "intermediate" level. 9. A cooling air supply control apparatus, the apparatus comprising: a body of the refrigerator; cooling means for being disposed with the body of the refrigerator to thereby generate the cooling air; a refrigerating chamber for being formed within the body of the refrigerator and being adapted to have both side wall surfaces, upper and lower partitioning wall surfaces and a rear wall surface; a plurality of cooling air discharge routes for being connected to at least a plurality of cooling air discharge outlets formed at the rear wall surface; a cooling air duct for being arranged at the rear wall surface of the body of the refrigerator and for having an opening at the rear surface of the refrigerating chamber to thereby guide the cooling air from the cooling means to the rear wall surface of the refrigerating chamber; ; temperature detecting means for detecting the temperature in the refrigerating chamber; and damper means for being provided at the opening at the rear wall surface of the refrigerating chamber and for being rotatably disposed in the plurality of cooling air discharge routes, so that the temperature difference in the refrigerating means can be reduced and the cooling air generated from the cooling means can be discharged through a predetermined discharge outlet among the plurality cooling discharge outlets.

Inventors: JEONG SEONG WOOK, JEONG, SEONG, WOOK
Applicants: JEONG SEONG WOOK, SAMSUNG ELECTRONICS CO LTD, JEONG, SEONG, WOOK, SAMSUNG ELECTRONICS CO., LTD.
Application year: 1995
Main classification: G05D23
IPC codes: F25D11, F25D17