Control apparatus

Abstract

To provide a control apparatus capable of curbing degradation in battery cooling performance of a blower.SOLUTION: A control apparatus comprises a battery, a blower, a filter, a first detection part, and a control part. The blower delivers air to the battery by forward rotation. The filter covers the blower from the upstream side in an air blast direction. The first detection part detects an occupant within a vehicle. The control part performs control for rotating the blower backward by maximum output, when the first detection part does not detect the occupant within the vehicle for a predetermined period of time after the vehicle stops.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a control device. [Background technology]

[0002] Electric vehicles, such as hybrid vehicles (HVs) and electric vehicles (EVs), are equipped with blowers to cool the batteries. The blowers cool the batteries by blowing air from the vehicle cabin onto the batteries. The blowers are protected from dust and other contaminants by a filter attached to the blower cover. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-162152 Summary of the Invention [Problem to be solved by the invention]

[0004] When the blower is used continuously, dust and other particles can accumulate in the filter, causing it to clog prematurely. When the filter becomes clogged, the blower's ability to blow air decreases, which can lead to a decrease in the blower's ability to cool the battery.

[0005] One object of the present invention is to provide a control device that can suppress a decrease in the battery cooling performance of a blower. [Means for solving the problem]

[0006] In order to achieve the above object, the control device according to the present invention includes a battery, a blower, a filter, a first detection unit, and a control unit. The blower blows air to the battery by rotating in a forward direction. The filter covers the blower from the upstream side in the air blowing direction. The first detection unit detects an occupant inside the vehicle. The control unit controls the blower to rotate in the reverse direction at maximum output if the first detection unit does not detect an occupant inside the vehicle for a predetermined time after the vehicle has stopped. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a vehicle control device that can suppress a decrease in the battery cooling performance of a blower. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing the configuration of a power supply unit with a filter cover removed according to one embodiment. [Figure 2] FIG. 2 is a functional block diagram showing an example of the functional configuration of the vehicle control device of the above embodiment. [Figure 3] FIG. 3 is a flowchart showing the flow of processing by the vehicle control device of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] [Embodiment] Hereinafter, an embodiment of the ECU 17 will be described in detail with reference to the accompanying drawings. The configuration of the embodiment described below, and the actions and results (effects) brought about by the configuration are merely examples, and are not limited to the following description. Note that in this specification, ordinal numbers are used only to distinguish between parts and components, and do not indicate order or priority.

[0010] The outline and structure of an electric vehicle 1 according to this embodiment will be described below. FIG. 1 is a perspective view showing the configuration of a power supply unit 1a in one embodiment with a filter cover removed. The power supply unit 1a is mounted on the electric vehicle 1, which is a battery electric vehicle (BEV). The power supply unit 1a may also be mounted on other vehicles such as a hybrid electric vehicle (HEV) or a fuel cell electric vehicle (FCV). The power supply unit 1a is mounted, for example, under the driver's seat or passenger seat of the vehicle. The power supply unit 1a has a battery pack 11a that houses a battery 11, a blower 12, a filter 13, an air intake 14, and a filter cover (not shown).

[0011] The battery 11 is a secondary battery (for example, a lithium ion battery) that supplies electricity to a motor (not shown) of the electric vehicle 1. The battery 11 is charged by regenerated power or power from a charger.

[0012] The battery pack 11a is a container that houses a battery 11, such as a lithium-ion battery. The bottom surface of the battery pack 11a is provided with legs, such as ribs. The battery pack 11a is supported on a waterproof tray by the ribs and is mounted on the vehicle body via the waterproof tray. The battery pack 11a may be mounted on the vehicle body without the waterproof tray or by another method.

[0013] The blower 12, for example, takes in air from inside the vehicle using a fan (not shown) and blows the air to the battery 11 by rotating in the forward direction, thereby cooling the battery 11. The blower 12 is disposed near one end of the vehicle in the width direction. The position at which the blower 12 is disposed is not limited to this, and for example, one blower 12 may be disposed near each end on both sides of the vehicle in the width direction.

[0014] The filter 13 is, for example, a bellows-shaped nonwoven fabric, filter paper, or other filter. As shown in Fig. 1, the filter 13 is provided at the air intake 14, closes the air intake 14, and is covered from approximately the +Z direction by a filter cover. The filter 13 also covers the blower 12 from the upstream side in the air blowing direction. This allows the filter 13 to capture foreign matter such as dust and dirt contained in the air passing through the air intake 14 and protect the blower 12 from the foreign matter.

[0015] 2 is a functional block diagram showing an example of the functional configuration of the ECU 17 of the embodiment. The ECU 17 of the embodiment is, for example, a control device mounted on the power supply unit 1a, and controls the forward or reverse rotation of the fan of the blower 12 that blows air to the battery 11.

[0016] The ECU 17 includes a battery temperature acquisition unit 181, a blower unit 182, a seating detection unit 183, a door unlocking detection unit 184, a filter clogging detection unit 185, an air conditioner air volume acquisition unit 186, a vehicle speed acquisition unit 187, and a control unit 188.

[0017] The battery temperature acquisition unit 181 acquires the internal temperature of the battery 11 using the temperature sensor 171 . The battery temperature acquisition unit 181 transmits the acquired temperature value of the battery 11 to the ECU 17 when the temperature of the battery 11 acquired by the temperature sensor 171 exceeds a predetermined threshold value.

[0018] The blower unit 182 rotates the fan of the blower 12 in the forward direction to blow air from the inside of the vehicle toward the battery 11, thereby cooling the battery 11. The blower unit 182 also rotates the fan of the blower 12 in the reverse direction to blow air from the battery 11 side toward the inside of the vehicle, thereby removing foreign matter trapped by the filter 13 from the filter 13. The blower unit 182 also transmits a signal of the rotation speed of the fan of the blower 12 to the ECU 17.

[0019] The seating detection unit 183 detects an occupant in the vehicle. More specifically, the seating detection unit 183 detects pressure generated by an occupant sitting in each seat (not shown) in the vehicle using the seating sensor 172a. The seating sensor 172a is mounted on the seat surface of each seat. The seating detection unit 183 also detects that the occupant has fastened a seat belt using the seat belt sensor 172b. The seating detection unit 183 is an example of a first detection unit.

[0020] The door unlocking detection unit 184 detects that each door of the vehicle has been unlocked by the door lock sensor 173. For example, when the door unlocking detection unit 184 detects that at least one of the doors of the vehicle has been unlocked, the door unlocking detection unit 184 transmits a signal notifying that the door has been unlocked to the ECU 17. The door unlocking detection unit 184 is an example of a second detection unit.

[0021] The filter clogging detection unit 185 detects clogging of the filter 13 using the filter clogging sensor 175. More specifically, the filter clogging detection unit 185 detects that the filter 13 is starting to become clogged with foreign matter such as dust using the filter clogging sensor 175. The filter clogging sensor 175 monitors, for example, the air volume of the blower 12 and a warning signal that is issued when the filter 13 is clogged, and when the filter clogging sensor 175 detects that the air volume of the blower 12 is equal to or lower than a predetermined value or detects a warning signal that notifies the ECU 17 that the filter 13 is clogged, the filter clogging detection unit 185 transmits a signal that notifies the ECU 17 that the filter 13 is clogged. The filter clogging detection unit 185 is an example of a third detection unit.

[0022] The air conditioner air volume acquisition unit 186 acquires, at predetermined intervals, the operating state (on or off) and air volume of the air conditioner mounted on the electric vehicle 1. The air conditioner air volume acquisition unit 186 transmits signals of the acquired operating state and air volume of the air conditioner to the ECU 17.

[0023] The vehicle speed acquisition unit 187 acquires a vehicle speed signal output from the vehicle speed sensor 177 at predetermined intervals. The vehicle speed sensor 177 outputs, as a detection signal, a pulse signal synchronized with the rotation of a rotating body (for example, a drive shaft) that rotates as the vehicle travels. The vehicle speed acquisition unit 187 transmits the vehicle speed signal acquired by the vehicle speed sensor 177 to the ECU 17.

[0024] Based on signals transmitted from various sensors in the vehicle, the ECU 17 determines the rotation direction (forward or reverse), rotation speed, and rotation timing of the fan of the blower 12, and causes the control unit 188 to control the rotation. More specifically, for example, if the seating detection unit 183 does not detect a passenger inside the vehicle for a predetermined time after the vehicle has stopped, the control unit 188 controls the blower 12 to rotate in reverse at maximum output for a predetermined time. For example, if the door unlock detection unit 184 of the ECU 17 detects that a door on one side has been unlocked, the control unit 188 controls the fan of the blower 12 to rotate in reverse at an output lower than the maximum for a predetermined time. For example, if the filter clogging detection unit 185 of the ECU 17 detects clogging of the filter 13, the control unit 188 controls the fan of the blower 12 to rotate in reverse. That is, the rotation control of the fan of the blower 12 in the above-described control is executed by the control unit 188. The ECU 17 is an example of a control device.

[0025] In addition to the seating detection unit 183, the ECU 17 may also include a seat belt sensor (not shown) that detects whether the seat belts of all the seats in the vehicle are being used by the occupants.

[0026] If the ECU 17 is equipped with a seat belt sensor, for example, when the seating detection unit 183 detects that no occupants are seated in any seat, and further, the door lock sensor 173 detects that the doors have been locked with the door key while the vehicle power is off, and the seat belt sensor detects that the seat belts of all the seats in the vehicle are not being used by the occupants, the seating detection unit 183, the door lock sensor 173, and the seat belt sensor send a signal to the ECU 17 informing that no occupants are in the vehicle.

[0027] If the seating detection unit 183 detects that no occupants are seated in any seat, the door lock sensor 173 may not detect that the doors have been locked with the door key while the vehicle power is off, or the seat belt sensor may not detect that the seat belts of all the seats in the vehicle are not being used by the occupants, and may send a signal to the ECU 17 informing them that there are no occupants in the vehicle.

[0028] In addition, ECU17 may be equipped with, for example, an in-vehicle camera (not shown) arranged inside the vehicle, and when the in-vehicle camera detects that there are no occupants in the vehicle by capturing images of the interior of the vehicle, it may send a signal to ECU17 informing that there are no occupants in the vehicle.

[0029] [Blower control by control device] Next, the flow of control by the ECU 17 will be described with reference to Fig. 3. Fig. 3 is a flowchart showing the flow of processing by the ECU 17 in the above embodiment. First, in step S101, the battery temperature acquisition unit 181 acquires the temperature of the battery 11, and the temperature information of the battery 11 is transmitted to the ECU 17. Then, based on the temperature information of the battery 11 transmitted from the battery temperature acquisition unit 181, the ECU 17 determines whether or not it is necessary to cool the battery 11.

[0030] If the ECU 17 determines in step S101 that the battery 11 needs to be cooled, the control unit 188 controls the fan of the blower 12 to rotate in the forward direction (step S102). As a result, the battery 11 is cooled by the blower 12 blowing air thereon for a predetermined time, and the control by the ECU 17 returns to step S101.

[0031] If the ECU 17 determines in step S101 that there is no need to cool the battery 11, then in step S103, the ECU 17 determines whether a signal indicating that there is no passenger in the vehicle has been sent from the seating detection unit 183.

[0032] If the ECU 17 determines in step S103 that a signal indicating that no passenger is present in the vehicle has been transmitted from the seating detection unit 183, the control unit 188 reversely rotates the fan of the blower 12 at the maximum rotation speed in step S104. Then, in step S105, the ECU 17 determines whether a signal indicating that the filter 13 is clogged has been transmitted from the filter clogging detection unit 185.

[0033] If ECU 17 determines in step S105 that a signal indicating that filter 13 is clogged has been sent from filter clogging detection unit 185, control unit 188 continues control of the fan of blower 12 to rotate in reverse at maximum output for approximately one minute (step S106). Thereafter, control unit 188 stops the rotation of the fan of blower 12 (step S107). Here, the time during which control unit 188 controls the rotation of the fan of blower 12 is measured by a timer (not shown), and ECU 17 acquires the measured value. The same applies to the following description.

[0034] If ECU 17 determines in step S105 that a signal indicating that filter 13 is clogged has not been transmitted from filter clogging detection unit 185, control unit 188 continues control of the fan of blower 12 to rotate in reverse at maximum output for approximately 10 seconds (step S108). Thereafter, control unit 188 stops the rotation of the fan of blower 12 (step S109).

[0035] In steps S107 and S109, when the control unit 188 stops the rotation of the blower 12, the control by the ECU 17 returns to step S101.

[0036] If, in step S103, the ECU 17 determines that a signal indicating that there is no occupant in the vehicle has not been transmitted from the seating detection unit 183, then, in step S201, the ECU 17 determines whether a signal indicating that the door on one side of the vehicle where the blower 12 is located in the width direction has been unlocked has been transmitted from the door unlock detection unit 184.

[0037] In step S201, if ECU 17 determines that a signal indicating that the door on one side of the vehicle in the width direction where blower 12 is installed has been unlocked has been transmitted from door unlock detection unit 184, control unit 188 controls the fan of blower 12 to rotate in reverse at a predetermined rotation speed or less (step S202). Here, "a predetermined rotation speed or less" refers to a range of rotation speeds of the fan of blower 12 that will not cause discomfort to passengers near the vehicle due to the rotation noise of the fan of blower 12. Then, ECU 17 determines whether a signal indicating that the door has been locked has been transmitted from door unlock detection unit 184 (step S203).

[0038] In step S203, if ECU 17 determines that a signal indicating that the door is locked has been transmitted from door unlock detection unit 184, control unit 188 performs control to stop the rotation of blower 12 (step S204). In step S203, if ECU 17 determines that a signal indicating that the door is locked has not been transmitted from door unlock detection unit 184, control unit 188 continues control to rotate blower 12 in the reverse direction at a predetermined rotation speed or less. Then, in step S205, when one minute has elapsed since the start of the reverse rotation of blower 12 at a rotation speed or less than the predetermined rotation speed, control unit 188 stops the rotation of blower 12 (step S206).

[0039] In steps S204 and S206, when the control unit 188 stops the rotation of the blower 12, the control by the ECU 17 returns to step S101.

[0040] In step S201, if the ECU 17 determines that a signal indicating that the door on one side of the vehicle in the width direction where the blower 12 is disposed has been unlocked has not been transmitted from the door unlock detection unit 184, then in step S301, the ECU 17 determines whether a signal indicating that the filter 13 is clogged has been transmitted from the filter clogging detection unit 185.

[0041] In step S301, if the ECU 17 determines that a signal indicating that the filter 13 is clogged has been sent from the filter clogging detection unit 185, the ECU 17 determines whether a signal indicating that the air conditioner is in an on state has been sent from the air conditioner air volume acquisition unit 186 (step S302).

[0042] In step S302, if ECU 17 determines that a signal indicating that the air conditioner is on has been sent from air conditioner air volume acquisition unit 186, ECU 17 determines whether the value of the vehicle speed signal sent from vehicle speed acquisition unit 187 is greater than 0, i.e., whether the vehicle is moving (step S303).

[0043] In step S303, if ECU 17 determines that the vehicle is moving, control unit 188 causes the fan of blower 12 to rotate in reverse at a rotation speed according to the value of the vehicle speed signal transmitted from vehicle speed acquisition unit 187 and the value of the air conditioner air volume signal transmitted from air conditioner air volume acquisition unit 186 (step S304), and control by ECU 17 proceeds to step S309, which will be described later.

[0044] Here, the rotation speed corresponding to the value of the vehicle speed signal transmitted from vehicle speed acquisition unit 187 refers to a range of rotation speeds of the fan of blower 12 at which the passengers inside the vehicle do not feel uncomfortable due to road noise generated by the vehicle while it is moving. Also, the rotation speed corresponding to the value of the air conditioner air volume signal transmitted from air conditioner air volume acquisition unit 186 refers to a range of rotation speeds of the fan of blower 12 at which the passengers inside the vehicle do not feel uncomfortable due to noise generated by the air blowing from the air conditioner. These definitions of the rotation speed of the fan of blower 12 are the same in the following explanations.

[0045] If the ECU 17 determines in step S303 that the vehicle is not moving, the control unit 188 reverses the rotation of the fan of the blower 12 at a rotation speed corresponding to the value of the air conditioner air volume signal transmitted from the air conditioner air volume acquisition unit 186 (step S305), and the control by the ECU 17 proceeds to step S309, which will be described later.

[0046] In step S302, if ECU 17 determines that a signal indicating that the air conditioner is on has not been transmitted from air conditioner air volume acquisition unit 186, ECU 17 determines whether the vehicle speed value of the vehicle speed signal transmitted from vehicle speed acquisition unit 187 is greater than 0, i.e., whether the vehicle is moving (step S306).

[0047] If the ECU 17 determines in step S306 that the vehicle is moving, the control unit 188 causes the fan of the blower 12 to rotate in the reverse direction at a rotation speed according to the value of the vehicle speed signal transmitted from the vehicle speed acquisition unit 187 (step S307).

[0048] If ECU 17 determines in step S306 that the vehicle is not moving, the vehicle is stopped, and the air conditioner is off. In this case, control unit 188 reversely rotates the fan of blower 12 at a predetermined rotation speed (step S308). Here, the predetermined rotation speed refers to a range of rotation speeds of blower 12 that will not cause discomfort to passengers inside the vehicle when the vehicle is stopped and the air conditioner is off.

[0049] Next, in step S309, the battery temperature acquisition unit 181 acquires the temperature of the battery 11, and transmits the temperature information of the battery 11 to the ECU 17. Then, based on the temperature information of the battery 11 transmitted from the battery temperature acquisition unit 181, the ECU 17 determines whether or not it is necessary to cool the battery 11.

[0050] If the ECU 17 determines in step S309 that the battery 11 needs to be cooled, the control unit 188 stops the reverse rotation of the blower 12 (step S310).

[0051] If, in step S309, ECU 17 determines that it is not necessary to cool battery 11, control unit 188 continues control to rotate the fan of blower 12 in reverse at the rotation speed determined in any one of steps S304, S305, S307, and S308. Then, in step S311, when one minute has elapsed since the reverse rotation of the fan of blower 12 began, control unit 188 stops the rotation of the fan of blower 12 (step S312).

[0052] In steps S310 and S312, when the control unit 188 stops the rotation of the fan of the blower 12, the control by the ECU 17 returns to step S101. In the above steps, the control unit 188 controls the direction in which the fan of the blower 12 rotates, the rotation speed of the fan of the blower 12, and the timing at which the fan of the blower 12 rotates.

[0053] The step of step S301 in which the ECU 17 determines whether a signal indicating that the filter 13 is clogged has been transmitted from the filter clogging detection unit 185 may be executed independently of steps S103 and S201. That is, if the ECU 17 determines in step S101 that it is not necessary to cool the battery 11, the ECU 17 may determine in step S103 whether a signal indicating that no passenger is present in the vehicle has been transmitted from the seating detection unit 183, and may determine in step S301 whether a signal indicating that the filter 13 is clogged has been transmitted from the filter clogging detection unit 185, without determining in step S201 whether a signal indicating that the door on one side of the vehicle in the width direction where the blower 12 is disposed has been unlocked from the door unlock detection unit 184.

[0054] This embodiment relates to an electric vehicle 1 equipped with a battery 11 for driving. In contrast, in a vehicle equipped with a drive engine, the control of the ECU 17 in this embodiment can be applied to the radiator fan. That is, in a vehicle equipped with a drive engine, the control unit 188 of the ECU 17 reverses the rotation of the radiator fan under predetermined conditions. This allows the ECU 17 to prevent the radiator from clogging, and ultimately to prevent a decrease in the radiator's engine cooling performance.

[0055] Furthermore, in a vehicle equipped with an air conditioner and a drive engine, the control of the ECU 17 in this embodiment can be applied to the air conditioner. That is, in a vehicle equipped with an air conditioner and a drive engine, the control unit 188 of the ECU 17 controls the air conditioner to perform heating operation for a certain period of time using residual heat from the heat exchanger when the seating detection unit 183 detects that no passengers are seated in any of the seats inside the vehicle after the ECU 17 has finished cooling operation of the air conditioner. This allows the ECU 17 to dry the inside of the air conditioner and ultimately suppress the generation of odor sources such as mold inside the air conditioner.

[0056] In the above embodiment, the ECU 17 includes the battery 11, the blower 12, the filter 13, the seating detection unit 183, and the control unit 188. The blower 12 blows air to the battery 11 by rotating in the forward direction. The filter 13 covers the blower 12 from the upstream side in the air blowing direction. The seating detection unit 183 detects an occupant in the vehicle. If the seating detection unit 183 does not detect an occupant in the vehicle for a predetermined time after the vehicle has stopped, the control unit 188 controls the blower 12 to rotate in the reverse direction at maximum output.

[0057] In this embodiment, the seating detection unit 183 detects the pressure generated when a passenger sits on the seat.

[0058] In this embodiment, the seating detection unit 183 detects whether the occupant has fastened the seat belt.

[0059] In the above-described configuration, if the seating detection unit 183 does not detect a passenger inside the vehicle for a predetermined period of time after the vehicle has stopped, the control unit 188 controls the blower 12 to rotate in reverse at maximum output for a predetermined period of time. As a result, if dust or the like has accumulated on the filter 13, the ECU 17 can release the dust or the like from the filter 13 at a timing that would be uncomfortable for the passenger without generating noise. As a result, the ECU 17 can prevent the filter 13 from clogging and suppress a decrease in the battery cooling performance of the blower 12.

[0060] In this embodiment, the blower 12 is disposed near one end of the vehicle in the width direction. The ECU 17 includes a door unlock detection unit 184 that detects that a vehicle door has been unlocked. When the door unlock detection unit 184 detects that a door disposed on one side has been unlocked, the control unit 188 causes the blower to rotate in reverse for a predetermined time at an output lower than the maximum.

[0061] In the above-described configuration, when the door unlock detection unit 184 detects that the door on one side where the blower 12 is installed is unlocked, the control unit 188 rotates the blower 12 in reverse for a predetermined time at an output lower than the maximum. That is, when a passenger gets in or out of the vehicle through a door near the end on the side where the blower 12 is installed, the blower 12 installed closest to the passenger rotates in reverse at an output lower than the maximum. As a result, if dust or the like has accumulated on the filter 13, the ECU 17 can release the dust or the like from the filter 13 without generating unpleasant noise, even when the passenger gets in or out of the vehicle through a door near the position where the blower 12 is installed. Consequently, the ECU 17 can prevent the filter 13 from clogging and suppress a decrease in the battery cooling performance of the blower 12.

[0062] In this embodiment, the ECU 17 also includes a filter clogging detection unit 185 that detects clogging of the filter 13. When the filter clogging detection unit 185 detects clogging of the filter 13, the control unit 188 causes the blower 12 to rotate in the reverse direction.

[0063] In the above-described configuration, when the filter clogging detection unit 185 detects clogging of the filter 13 and the seating detection unit 183 detects the presence of a passenger in the vehicle, the control unit 188 reverses the rotation of the blower 12. That is, when clogging of the filter 13 is detected and there is a passenger in the vehicle, the control unit 188 reverses the rotation of the blower 12 regardless of whether the vehicle is moving or stopped. This allows the ECU 17 to quickly clear the clogging of the filter 13 and suppress a decrease in the battery cooling performance of the blower 12.

[0064] Although the embodiments of the present invention have been described above, the above-described embodiments are presented as examples and are not intended to limit the scope of the present invention. This novel embodiment can be embodied in various other forms. Furthermore, various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. Furthermore, this embodiment is included within the scope and spirit of the invention, and is also included in the inventions and their equivalents described in the claims. [Explanation of symbols]

[0065] 1 electric car 11 Batteries 12 Blower 13 Filters 17 ECU 183 Seated detection unit 184 Door unlock detection unit 185 Filter clogging detector 188 Control Unit

Claims

1. Batteries and a blower that blows air to the battery by rotating in a forward direction; a filter that covers the blower from the upstream side in the air blowing direction; a first detection unit that detects an occupant in the vehicle; a control unit that controls the blower to rotate in reverse at a maximum output when the first detection unit does not detect the occupant inside the vehicle for a predetermined period of time after the vehicle has stopped; A control device comprising:

2. The first detection unit detects pressure generated by the occupant sitting in the seat. The control device according to claim 1 .

3. The first detection unit detects that the occupant has fastened a seat belt. The control device according to claim 1 .

4. the blower is disposed at a position close to one end of the vehicle in a width direction, a second detection unit that detects that a door of the vehicle has been unlocked; When the second detection unit detects that the door disposed on the one side has been unlocked, the control unit rotates the blower in reverse for a predetermined time at an output smaller than a maximum. The control device according to any one of claims 1 to 3.

5. a third detection unit that detects clogging of the filter; When the third detection unit detects clogging of the filter, the control unit reverses the rotation of the blower. The control device according to any one of claims 1 to 3.

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