Patent Description:
Various types of vehicles, such as cars, trucks, motorcycles, busses, boats, airplanes, helicopters, lawn mowers, recreational vehicles, amusement park vehicles, farm equipment, construction equipment, trams, golf carts, trains, trolleys, etc., may be equipped with various types of sensors in order to detect objects in the vehicle's environment. For example, vehicles, such as autonomous vehicles, may include sensors such as LIDAR, radar, sonar, camera, or other such imaging sensors that scan and record data from the vehicle's environment. Sensor data from one or more of these sensors may be used to detect objects and their respective characteristics (position, shape, heading, speed, etc.).

Operation of these sensors may be adversely affected by the buildup of heat within the sensor itself. Typically, the sensors include a housing to protect the internal sensor components of the sensors from debris and contaminants, but over time, the housing may trap solar heat, as well as heat generated by the various internal components of the sensor. As such, the sensor components may be subjected to sub-optimal temperature conditions during operation.

<CIT> describes a device for protecting an optical sensor of a driver-assistance system for a motor vehicle, a corresponding driver-assistance system and a corresponding assembling process. The optical sensor includes an optic and two assembled separate subassemblies. A first subassembly is mounted so as to be able to rotate about an axis of rotation and includes a housing that is configured to at least partially receive the optical sensor and an optical element that is configured to be placed upstream of the optic of the optical sensor. A second subassembly includes an actuator that is configured to drive the first subassembly to rotate.

In some instances, the main vent may be positioned on a top portion of the sensor housing. In some examples, the side vent may positioned on a side wall of the sensor housing closer to a base portion of the sensor housing than the top portion.

In some instances, the main vent may be positioned on a base portion of the sensor housing. In some examples, the side vent may be positioned on a side wall of the sensor housing closer to a top portion of the sensor housing than the bottom portion.

In some instances, the system may further comprise one or more guide blades fixed relative to the sensor housing, wherein the one or more guide blades are configured to force the air pulled into the interior portion of the sensor housing radially outward from the axis. In some examples, the motor may be configured to rotate the one or more guide blades to force the air pulled into the interior portion of the sensor housing radially outward from the axis.

In some instances, the system may further comprise one or more contoured blades fixed relative to the sensor housing, wherein the one or more contoured blades are configured to force the air pulled into the interior portion of the sensor housing through the side vent. In some examples, the motor may be configured to rotate the one or more contoured blades to force the air pulled into the interior portion of the sensor housing through the side vent.

In some instances, the system may further comprise one or more guide blades and one or more contoured blades. In some examples, the one or more guide blades may be straight and the one or more contoured blades may be curved.

In some instances, the sensor may be mounted to a vehicle. In some examples, system may further include the vehicle.

In some instances, the system may further comprise an interior channel within the sensor housing connected to the exhaust vent (side vent). In some examples, the air pulled into the interior portion of the sensor housing may flow through the interior channel to the exhaust vent.

In some instances, the system may further comprise one or more guide blades, wherein the one or more guide blades are configured to force the air pulled into the interior portion of the sensor housing radially outward from the axis.

In some instances, the system may further comprise one or more contoured blades, wherein the one or more contoured blades are configured to force the air pulled into the interior portion of the sensor housing through the interior channel and out of the exhaust vent.

In some instances, the system may further comprise a vehicle, wherein the sensor is mounted to the vehicle.

This technology relates to cooling the interior of a sensor housing, and associated computer components positioned therein, by using convective air flows. In this regard, a sensor may be comprised of internal sensor components, such as sensors and processors, and housing. The housing may protect the internal sensor components and processors from elements, such as rain, snow, dust and other such debris. However, operation of the internal sensors components, processors, and solar energy may result in excessive heat within the housing. Such excessive heat may prematurely degrade the internal sensor components and processors and possibly overheat the processors making them inoperable.

To dissipate the heat within the sensor housing, a convective air flow may be passed through the sensor housing. In this regard, the rotation of the sensor housing may generate a force which pulls cool air located externally from the sensor into the interior of the sensor housing. The cool, pulled in air may be directed across the sensor's internal components, thereby drawing heat away from the sensor's internal components. The heated air may then be directed out of the sensor housing.

A vehicle may have one or more sensors to detect objects external to the vehicle such as other vehicles, obstacles in the roadway, traffic signals, signs, trees, etc. For example, the vehicle <NUM>, as shown in <FIG>, may include lasers, sonar, radar, cameras and/or any other detection devices that capture images and record data which may be processed by computing devices within the vehicle. The vehicle's sensors, such as LIDAR, radar, cameras, sonar, or other such imaging sensors, may capture images and detect objects and their characteristics such as location, orientation, size, shape, type, direction and speed of movement, etc. Images may include the raw (i.e., unprocessed) data captured by the sensors and/or pictures and videos captured by camera sensors. Images may also include processed raw data. For instance, the raw data from the sensors and/or the aforementioned characteristics can be quantified or arranged into a descriptive function or vector for processing by the computing devices. The images may be analyzed to determine the vehicle's location, and to detect and respond to objects when needed.

The sensors may be arranged around the vehicle's exterior or interior. For example, housings <NUM>, <NUM>, <NUM>, <NUM>, <NUM> may include, for example, one or more LIDAR devices. The sensors may also be incorporated into the typical vehicle components, such as tail lights/turn signal lights <NUM> and/or side view mirrors <NUM>. In some instances one or more laser, radar, sonar, camera and/or other such imaging sensors may be mounted on the roof, such as in housing <NUM>, attached to mount <NUM>.

A vehicle sensor may be comprised of internal sensor components and a housing for housing the internal sensor components. For instance, the housing <NUM>, which may be compared to housings <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, and <NUM>, may be configured such that it has a domed shaped top portion <NUM> with a side wall <NUM>, such that the housing is in the shape of a frustum, as shown in <FIG>. Although the sensor housing is shown in the shape of a frustum, the sensor housing may be configured in various shapes and sizes, such as spheres, cylinders, cuboids, cones, prisms, pyramids, cubes, etc., or any combination of such shapes. The sensor housing <NUM> may be comprised of materials such as plastic, glass, polycarbonate, polystyrene, acrylic, polyester, etc..

The sensor housing may include a housing window constructed at a certain location on the sensor housing such that the internal sensor components may transmit and receive one or more signals through the housing window. For instance, the side wall <NUM> of the sensor housing <NUM> may include a flat portion <NUM> in which housing window <NUM> is incorporated to allow signals (not shown) from internal sensor components <NUM> to penetrate the sensor cover <NUM>, as further shown in <FIG>. Although, the housing window <NUM> is shown as being circular in <FIG>, various other shapes may also be used for the housing window. In addition, the housing window may be incorporated onto non-flat surfaces of the housing.

In some instances the entire sensor housing <NUM>, or a large portion of the sensor housing <NUM>, may be penetrable by the signals transmitted and received by the internal sensor components, thereby allowing a large portion or the entire sensor housing <NUM> to function as a housing window. Although the housing window <NUM> is shown as being only a portion of the side wall <NUM>, in some instances the entire side wall <NUM> may be constructed as a housing window. Further, multiple housing windows may be positioned on the sensor housing <NUM>. The housing window <NUM> may be composed of the same, or different, material as the sensor housing <NUM>.

The sensor <NUM> and/or sensor housing <NUM> may be attached to a motor via a sensor shaft. For instance, as further shown in <FIG>, the sensor shaft <NUM> may include a first end <NUM> and a second end <NUM>. The first end of the of a sensor shaft <NUM> may be attached to a sensor motor <NUM> and the second end of the sensor shaft <NUM> may be connected to the sensor <NUM> and/or sensor cover <NUM>, such as at the base portion <NUM> of the sensor cover. In this regard, the first end of the sensor shaft <NUM> may be attached to the motor <NUM> via a belt, gear, chain, friction roller, etc. The motor <NUM> may rotate the sensor shaft <NUM> in the first direction <NUM> causing the entire sensor <NUM> and/or sensor housing <NUM> to also rotate in the first direction <NUM>. In some embodiments the sensor shaft <NUM> may only rotate the sensor housing <NUM>, and not the internal components <NUM> of the sensor. The sensor <NUM>, sensor housing <NUM>, and/or motor <NUM> may each be located internally or externally from a vehicle. Although <FIG> shows the sensor <NUM> being attached to the motor <NUM> via a shaft <NUM>, the motor <NUM> may be integrated or otherwise directly connected to the sensor <NUM> and/or sensor housing <NUM>.

The sensor housing includes a main vent through which air may flow into the interior of the sensor housing. The main vent is be positioned in a location where a pressure differential between the air located externally from the sensor housing and the air within the interior of the sensor housing occurs, such as on or near the axis of rotation of the sensor housing. The pressure differential is formed by the force generated by the rotation of the sensor housing lowering the pressure within the sensor housing relative to the air outside of the sensor housing. In this regard, the force increases the pressure the further outwards the air flows. Accordingly, a low pressure is generated near the axis of rotation and a high pressure is generated towards the perimeter where the side vents, described herein, are located. In some instances a sensor housing may include two or more main vents. The pressure differential may cause air to flow through the main vent into the lower pressure interior of the sensor housing.

For example, sensor <NUM> shown in <FIG> and which may be compared to sensor <NUM>, includes a main vent <NUM> positioned on the sensor housing <NUM> at the center of the top portion <NUM>. As further illustrated in <FIG>, the main vent <NUM> is positioned on the axis of rotation, illustrated by line <NUM>, of sensor <NUM> as it moves in a first direction, illustrated by arrow <NUM>. Air may pass from the higher pressure location outside of the sensor housing <NUM>, through the main vent <NUM>, to the lower pressure locations in the interior of the sensor housing caused by the rotation of the sensor housing <NUM>, as illustrated by arrow <NUM>.

In another example, sensor <NUM> shown in <FIG> and which may be compared to sensors <NUM> and/or <NUM>, includes a main vent <NUM> positioned on the sensor housing <NUM> in the center of the base portion <NUM>. As further illustrated in <FIG>, the main vent <NUM> is positioned on the axis of rotation, illustrated by line <NUM>, of sensor <NUM> as it moves in a first direction, illustrated by arrow <NUM>. Although sensor <NUM> shows the main vent <NUM> as being centered on the top portion <NUM> and sensor <NUM> shows the main vent being centered on the base portion <NUM>, the main vent may be offset from the axis of rotation. Air may pass from the higher pressure location outside of the sensor housing <NUM>, through the main vent <NUM>, to lower pressure locations in the interior of the sensor housing caused by the rotation of the sensor housing <NUM>, as illustrated by arrow <NUM>.

The main vent may include a permeable cover which allows air to pass into the interior of the sensor housing while at the same time blocking particles and debris from entering into the interior of the sensor housing. In some instances, a filter may be positioned in or near the main vent to filter out particles and debris from the cool air which is pulled into the interior of the sensor housing. For example, main vent <NUM> of sensor <NUM> includes a filter cover <NUM> to block particles and debris from traveling through the main vent <NUM>.

Side vents may be positioned on the sensor housing to vent air to the exterior of the sensor housing. The side vents may be one or more openings in the sensor housing which are configured to allow air to flow from high pressure locations within the interior of the sensor housing to lower pressure locations outside of the sensor housing. The side vents may include one or more covers, louvers, and/or filters which may prevent particles from passing through the sensor housing.

The side vents may be positioned at a location on the sensor housing where air vented out of the sensor housing is directed away from the sensor housing's main vent to avoid recirculating air through the sensor housing. For instance, the side vents may be positioned at a location that vents the air in a radial direction relative to the main vent. For example, and as shown in <FIG>, side vents <NUM> are positioned on the side wall <NUM> near the base portion <NUM> of the sensor housing <NUM> when the main vent <NUM> is on the top portion <NUM> of the sensor <NUM>. Air from within the sensor housing <NUM> may be output through the side vents <NUM> in a direction radial direction relative to the main vent <NUM>, as illustrated by arrows <NUM>.

In another example, and as shown in <FIG>, side vents <NUM> may be positioned on the side wall <NUM> near the top portion <NUM> when the main vent <NUM> is on the base portion <NUM> of the sensor <NUM>. Air from within the sensor housing may be output through the side vents <NUM> in a direction radial direction relative to the main vent <NUM>, as illustrated by arrows <NUM>.

Guide blades may be positioned and mounted, or otherwise integrated, into the interior of the sensor housing. In this regard, the guide blades may be positioned around the axis of rotation of the sensor to move air away from the main vent to other portions of the interior of the sensor housing. The guide blades may remain fixed relative to the housing. In this regard, the rotation of the guide blades and the sensor housing may be at same rate and/or the guide blades may be permanently attached to the sensor housing. For example, and as shown in the cut-away top view of sensor <NUM> in <FIG>, the guide blades <NUM> may be positioned around the axis of rotation <NUM>. In the cut-away bottom view of sensor <NUM> shown in <FIG>, the guide blades may be positioned around the axis of rotation <NUM>. For clarity purposes, only a single guide blade in each sensor (i.e., sensor <NUM> and <NUM>,) is labeled in <FIG> and <FIG>.

The guide blades may be positioned anywhere within the sensor housing. However, the further radially outward the guide blades are positioned from the axis of rotation the more effective they may be at moving air away from the axis of rotation. In this regard, as the sensor housing rotates, the guide blades may also rotate forcing the air within the sensor housing to move in a radial direction away from the axis of rotation towards the side wall of the sensor. For example, and as illustrated in <FIG>, guide blades <NUM> may force air within sensor housing <NUM> radially outward as illustrated by arrows <NUM>. Similarly, guide blades <NUM> may force air within sensor housing <NUM> radially outward as illustrated by arrows <NUM>. The change in pressure the guide blades produce may increase the further outwards from the axis of rotation they extend. As such, the further the guide blades are positioned from the axis of rotation, the greater the change in pressure the guide blades may produce. Although the guide blades (e.g., <NUM> and <NUM>,) are illustrated as being straight, the guide blades may have contours, such as curves.

Contoured blades may be positioned and mounted, or otherwise integrated, into the interior of the sensor housing to force warmed air out of the sensor housing. In this regard, one or more contoured blades may be mounted near the side vents to force warm air from within the sensor housing to a location outside of the sensor housing. For example, and as shown in the cut-away bottom view of sensor <NUM> in <FIG>, the contoured blades <NUM> may be positioned around the axis of rotation <NUM>. Similarly, and as shown in the cut-away top view of sensor <NUM> in <FIG>, the contoured blades <NUM> may be positioned around the axis of rotation <NUM>. For clarity purposes, only a single contoured blade in each sensor (i.e., sensor <NUM> and <NUM>,) is labeled in <FIG> and <FIG>. Although the contoured blades (e.g., <NUM> and <NUM>,) are illustrated as being straight, the guide blades may have contours, such as curves.

The rotation of the sensor housing may also rotate the guide blades and contoured blades to generate an airflow through the sensor housing. In this regard, the rotation of the sensor housing may generate a force which pulls cool air located externally from the sensor into the interior of the sensor housing. The cool, pulled in air may be forced across the sensor's internal components by the rotation of the guide blades. Through convection, the air travelling past the internal sensor components may draw heat away from the internal components. The heated air may then be directed out of the sensor housing by the rotation of the contoured blades.

For example, <FIG> illustrates airflow through sensor <NUM> which includes a main vent <NUM> located on the top portion <NUM> of the sensor housing <NUM>. As the sensor housing <NUM> rotates in the first direction <NUM>, a force is generated which may pull cool air downward and through the main vent <NUM>, as illustrated by arrow <NUM>. The rotation of the guide blades <NUM> may force the cool air across the internal sensor components <NUM>, as illustrated by arrows <NUM>. The cool air passing across the internal sensor components <NUM> may draw heat away from the internal sensor components <NUM>. The rotation of the contoured blades <NUM> may then force the warmed air out of the sensor housing <NUM> through the side vents <NUM>.

<FIG> illustrates airflow through sensor <NUM> which includes a main vent <NUM> located on the base portion <NUM> of the sensor housing <NUM>. As the sensor housing <NUM> rotates in the first direction <NUM>, a force is generated which may pull cool air in and upwards through the main vent <NUM>, as illustrated by arrow <NUM>. The rotation of the guide blades <NUM> may force the cool air across the internal sensor components <NUM>, as illustrated by arrows <NUM>. The cool air passing across the internal sensor components <NUM> may draw heat away from the internal sensor components <NUM>. The rotation of the contoured blades <NUM> may then force the warmed air out of the sensor housing <NUM> through the side vents <NUM>.

The path of the air within the sensor housing may be controlled as the air flows through the sensor housing. In this regard, the sensor housing may include one or more channels through which the flow may travel. As such, the flow of air may be controlled, such that it can be directed to certain locations within the sensor housing, such as past internal sensor components which may requiring cooling.

For instance, and as illustrated in the cut-away top view of sensor <NUM> in <FIG>, sensor <NUM>, which may be compared to sensors <NUM>, <NUM>, and <NUM>, may include a main vent <NUM> on the top portion (not shown to allow the interior of the sensor housing to be shown) of sensor housing <NUM>. Within the interior of the sensor <NUM> may be a channel <NUM> which provides a controlled path through which air may flow. The rotation of the sensor <NUM> in the first direction illustrated by arrow <NUM>, along with the rotation of the contoured blades <NUM> positioned within the sensor housing <NUM>, may force air, illustrated as dashed line <NUM>, into channel <NUM>. The air <NUM> may flow through the channel <NUM> and out of the sensor housing at output <NUM>. In some instances, the air may flow through the channel <NUM> to targeted locations within the sensor housing.

The heated air may be exhausted past the housing window or other portions of the sensor housing to prevent particle buildup. In this regard, the sensor housing and/or housing window may become covered by particles such as water, dust, dirt, condensation, or other such elements and debris, over time. As such, the functions of the internal sensor components may be impeded as signals transmitted and received by the internal sensor components may be blocked by the buildup of particles.

To address this, a spoiler edge having a vent may be incorporated into or attached to the sensor housing. For example, and as illustrated in <FIG> and <FIG>, the spoiler edge <NUM> may be positioned adjacent to the housing window <NUM> and configured such that the spoiler edge <NUM> extends away from the housing window <NUM> and/or sensor housing <NUM>. As further illustrated in <FIG> and <FIG>, the spoiler edge <NUM> may be positioned such that the spoiler edge is at a leading position relative to the sensor window during rotation in the first direction <NUM>. The spoiler edge may include a vent <NUM> through which warmed air from the interior of the sensor can be output. Warmed air output through the vent <NUM> may be output across the face of the housing window, as illustrated by arrows <NUM>, to prevent the particles from building up on areas of the sensor housing where signals may be transmitted and/or received. Vent <NUM> may be used in lieu of, or in conjunction with side vents, such as side vents <NUM>. Although <FIG> and <FIG> illustrate the main vent positioned on the top portion <NUM> of sensor <NUM>, the main vent may be positioned on the bottom portion of the sensor.

The features described herein may allow for efficient dissipation of heat within a sensor housing. As noted above, a convective airflow may provide cooling for components within the sensor housing. As such, the heat generated by the sensor components in sensor housing, as well as the heat generated by solar radiation may be effectively removed. Moreover, by using guide blades and contoured blades within the sensor housing, air is able to be moved across the surface of the internal sensor components without the need for a fan. As a fan is not required to cool the sensor components, noise and vibration introduced by a fan is avoided. Moreover, by avoiding the need for a fan, fewer mover parts are required to cool the interior of the sensor housing, thereby decreasing the number of potential failure points of the cooling system. Moreover, the guide inlet blades and contoured blades do not require an additional power source.

Claim 1:
A system for cooling sensor components, the system comprising:
a sensor (<NUM>) having a rotatable sensor housing (<NUM>, <NUM>) and internal sensor components (<NUM>, <NUM>) positioned within the sensor housing; and
a motor (<NUM>), wherein the motor is configured to rotate the sensor housing around an axis (<NUM>, <NUM>);
wherein the sensor housing includes a main vent (<NUM>, <NUM>) and a side vent (<NUM>, <NUM>),
wherein the main vent is positioned at a first location of the sensor housing at which a pressure differential between air outside the sensor housing and air within an interior of the sensor housing occurs, wherein the pressure differential is formed by a force generated by the rotation of the sensor housing around the axis lowering the pressure of the air within the interior of the sensor housing relative to the air outside of the sensor housing such that the rotation of the sensor housing around the axis pulls air into an interior portion of the sensor housing through the main vent, and
wherein the side vent is positioned at a second location of the sensor housing at which the rotation of the sensor housing around the axis causes an increase in pressure within the interior of the sensor housing at the second location such that the rotation of the sensor housing around the axis causes the air pulled into the interior portion of the sensor housing (<NUM>, <NUM>) to be exhausted out (<NUM>, <NUM>) of the sensor housing through the side vent.