JPH07266857A - Automotive air conditioner - Google Patents

Abstract

(57) [Abstract] [Purpose] To perform a compressor control that does not stop in an automobile air conditioner that uses an electric compressor, a control that does not cause an overcurrent when restarting, and a control that has a good cool-down characteristic. It is intended. [Composition] An electric compressor, a vehicle exterior air heat exchanger, a vehicle exterior air heat exchanger blower, and a vehicle interior air heat exchanger,
A heat pump air-conditioning device composed of a blower device for a vehicle interior air heat exchanger and a refrigerant expansion device of either a mechanical expansion valve or a capillary tube, and an outlet side air temperature or surface of the vehicle interior air heat exchanger A vehicle interior air heat exchanger temperature detection device for detecting the temperature, and when the temperature detected by the vehicle interior air heat exchanger temperature detection device falls below a certain temperature, the rotational speed of the electric compressor is reduced to a set value. A control device is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner for air conditioning the interior of a vehicle.

[0002]

2. Description of the Related Art In a conventional fuel engine air conditioner for a vehicle, for example, a compressor 1 for compressing a refrigerant is driven by an engine as shown in FIG. After the heat is radiated to the air outside the passenger compartment by the air blower 3 for the outside air heat exchanger and the refrigerant is condensed and liquefied, the refrigerant is guided to the inside air heat exchanger 5 through the mechanical expansion valve 4, where The air blower 6 for the indoor air heat exchanger cools and dehumidifies the air in the vehicle interior to evaporate and perform a cooling operation.

However, when the compressor is replaced by an electric drive vehicle or an engine drive vehicle equipped with a generator and the compressor is replaced by an electric compressor that is not affected by the engine speed, the electric compressor has a high pressure side and a low pressure side. If there is a pressure difference, the starting torque of the electric compressor is large and an overcurrent flows at the time of starting. When an overcurrent flows, a trip occurs due to the current capacity protection of the electric compressor drive device.

When a mechanical expansion valve is used in the refrigerant expansion device, the mechanical expansion valve closes when the electric compressor is stopped, so that the pressure difference between the high pressure side and the low pressure side does not easily equalize, and the capillary is used. In the tube, if the pressure difference between both ends is not more than a certain pressure difference, the refrigerant does not flow, so it is difficult to equalize the pressure. Occurs.

Further, when the electric compressor is used, it is possible to control the rotation speed of the compressor which is not influenced by the engine rotation speed. Therefore, it is necessary to control the electric compressor having a good cool-down characteristic.

[0006]

Since there is a large starting torque when there is a pressure difference between the high pressure side and the low pressure side of the electric compressor, the starting torque is large.
When restarting with a pressure difference, a large current will flow during startup,
The protection of the electric compressor drive device works. So 1. Control that does not stop the electric compressor is required. It is necessary to control so that overcurrent does not flow at restart. Control with good cool-down characteristics is necessary The above was a problem when using an electric compressor in an automobile air conditioner.

The present invention has been made to solve the above-mentioned problems, and is to control a compressor that does not stop in an automobile air conditioner that uses an electric compressor, control that does not cause an overcurrent to flow when restarted, and cool down characteristics. The purpose is to perform good control.

[0008]

[Means for Solving the Problems]

(Claim 1) In order to solve the above problems, the present invention provides an electric compressor, a vehicle exterior air heat exchanger, a vehicle exterior air heat exchanger blower, a vehicle interior air heat exchanger, and a vehicle interior air. Detects the air temperature or surface temperature on the outlet side of the heat exchanger for the heat pump, which is composed of a blower for the heat exchanger and a refrigerant expansion device for either the mechanical expansion valve or the capillary tube. A vehicle interior air heat exchanger temperature detecting device, and a controller externally for decreasing the rotational speed of the electric compressor to a set value when the temperature detected by the vehicle interior air heat exchanger temperature detecting device is below a certain temperature. It is provided.

According to a second aspect of the present invention, there is provided a heat pump cooling device according to the first aspect, a discharge temperature detecting device for detecting a discharge temperature of an electric compressor, and the discharge temperature detecting device externally. Is provided with a control device for reducing the rotational speed of the electric compressor to a set value when the detected temperature exceeds a certain temperature.

(Claim 3) In order to solve the above-mentioned problems, the present invention provides a heat pump cooling device according to claim 1, a coil temperature detecting device for detecting a motor coil temperature inside an electric compressor, and the coil temperature outside. A control device is provided for reducing the rotation speed of the electric compressor to a set value when the detection temperature of the detection device exceeds a certain temperature.

(Claim 4) In order to solve the above-mentioned problems, the present invention provides the means of claim 1, a timer externally provided, and a temperature detected by a vehicle interior air heat exchanger temperature detecting device being a set value of claim 1. A control device is provided for stopping the electric compressor and restarting the electric compressor after a predetermined time by a signal from the timer when the value becomes lower than a set value lower than the set value.

(Claim 5) In order to solve the above-mentioned problems, according to the present invention, the means of claim 2, an external timer, and the detection temperature of the discharge temperature detection device are set higher than the set value of claim 2. A control device is provided for stopping the electric compressor and restarting the electric compressor after a certain period of time in response to a signal from the timer when the value exceeds the set value.

(Claim 6) In order to solve the above-mentioned problems, the present invention provides the means of claim 3, a timer externally provided, and the temperature detected by the coil temperature detecting device set higher than the set value of claim 3. A control device is provided for stopping the electric compressor and restarting the electric compressor after a certain period of time in response to a signal from the timer when the value exceeds the set value.

In order to solve the above-mentioned problems, the present invention provides the means of claim 1, an external timer, a setting panel for setting the rotation speed of the electric compressor, and the electric compression by the timer. A control device is provided for operating the machine at a constant rotational speed for a certain period of time at startup, and for operating the electric compressor at the rotational speed set by the setting panel after a certain period of time.

[0015]

[Action]

(Claim 1) When the indoor heat exchanger freezes and the temperature detected by the vehicle interior air heat exchanger temperature detecting device becomes equal to or lower than a certain temperature, the rotation speed of the electric compressor can be reduced to a set value.

(Claim 2) When the discharge temperature of the electric compressor rises and the temperature detected by the discharge temperature detecting device exceeds a certain temperature, the rotation speed of the electric compressor can be reduced to a set value.

(Claim 3) When the temperature of the motor coil in the electric compressor rises and the temperature detected by the coil temperature detecting device exceeds a certain temperature, the rotation speed of the electric compressor can be reduced to a set value.

(Claim 4) When the indoor heat exchanger freezes and the temperature detected by the vehicle interior air heat exchanger temperature detecting device falls below a certain temperature, the rotational speed of the electric compressor can be reduced to a set value. . Further, even in this state, the electric compressor can be stopped when the temperature detected by the vehicle interior air heat exchanger temperature detecting device further decreases, and the timer can restart the electric compressor after a certain period of time. it can.

(Claim 5) When the discharge temperature of the electric compressor rises and the temperature detected by the discharge temperature detecting device exceeds a certain temperature, the rotation speed of the electric compressor can be reduced to a set value. Further, even in this state, the electric compressor can be stopped when the temperature detected by the discharge temperature detecting device further rises, and the electric compressor can be restarted after a predetermined time by the timer.

(Claim 6) When the temperature of the motor coil in the electric compressor rises and the temperature detected by the coil temperature detecting device exceeds a certain temperature, the rotational speed of the electric compressor can be reduced to a set value. Further, even in that state, the electric compressor can be stopped when the temperature detected by the coil temperature detecting device further rises, and the electric compressor can be restarted after a predetermined time by the timer.

(Claim 7) When starting, the electric compressor can be operated at a constant rotation speed for a fixed time, and after a fixed time, the electric compressor can be operated at the rotation speed set by the setting panel. Further, when the indoor heat exchanger freezes and the temperature detected by the vehicle interior air heat exchanger temperature detection device becomes equal to or lower than a certain temperature, the rotation speed of the electric compressor can be reduced to a set value.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

The present invention according to claim 1 is intended to control a compressor which does not stop in an air conditioner for an automobile using an electric compressor.

FIG. 1 is a block diagram of an embodiment of an automobile air conditioner according to the present invention. In FIG. 1, an electric compressor 7, a vehicle exterior air heat exchanger 2, a vehicle exterior air heat exchanger blower 3, a mechanical expansion valve 4, a vehicle interior air heat exchanger 5, and a vehicle interior air heat exchanger. A heat pump cooling device configured by a blower device 6 for an exchanger, a vehicle interior air heat exchanger temperature detection device 8 for detecting an outlet side air temperature or a surface temperature of the vehicle interior air heat exchanger 5, and the external device described above. A control device 9 is arranged to reduce the rotation speed of the electric compressor 7 to a set value when the temperature detected by the vehicle interior air heat exchanger temperature detection device 8 falls below a certain temperature. The description is omitted because it is the same.

In the air conditioner for an automobile constructed as described above, when the vehicle interior air heat exchanger 5 freezes, the rotation speed of the electric compressor 7 can be lowered, so that the electric compressor 7 is stopped. It becomes possible to release the freezing without doing.

In the figure, the refrigerant expansion device has been described as the mechanical expansion valve 4, but the same effect can be obtained even when a capillary tube is used.

Further, in the figure, the description has been made for the cooling cycle, but instead of controlling the temperature of the vehicle interior air heat exchanger 5 by adding a four-way switching valve and the like, temperature detection is performed by the vehicle exterior air heat exchanger 2. By installing the device, it is possible to avoid the defrosting operation mode during heating operation without stopping the electric compressor when the outside air temperature is high to some extent (about 2 ° C. or higher).

The present invention as set forth in claim 2 is intended to control a compressor which does not stop in an air conditioner for a vehicle using an electric compressor.

FIG. 2 is a block diagram of an embodiment of an automobile air conditioner according to the present invention. In FIG. 2, the electric compressor 7, the vehicle exterior air heat exchanger 2, the vehicle exterior air heat exchanger blower 3, the mechanical expansion valve 4, the vehicle interior air heat exchanger 5, and the vehicle interior air heat. A heat pump cooling device configured by a blower device 6 for an exchanger, a discharge temperature detection device 10 for detecting a discharge temperature of the electric compressor 7, and a detection temperature of the discharge temperature detection device 10 outside a certain temperature. Control device 11 for reducing the rotation speed of the electric compressor 7 to a set value
, And the flow of the refrigerant is the same as that of the conventional example, and the description thereof will be omitted.

In the air conditioner for an automobile constructed as described above, when the discharge temperature of the electric compressor 7 becomes high, the rotational speed of the electric compressor 7 can be lowered, so the electric compressor The discharge temperature can be lowered without stopping 7.

Although the refrigerant expansion device has been described as the mechanical expansion valve 4 in the drawing, the same effect can be obtained when a capillary tube is used.

Although the cooling cycle has been described in the figure, the same effect can be obtained in a heat pump cooling / heating cycle in which a 4-way switching valve and the like are added.

The present invention as set forth in claim 3 is directed to control of a compressor which does not stop in an automobile air conditioner using an electric compressor.

FIG. 3 is a block diagram of an embodiment of an automobile air conditioner according to the present invention. In FIG. 3, the electric compressor 7, the vehicle exterior air heat exchanger 2, the vehicle exterior air heat exchanger blower 3, the mechanical expansion valve 4, the vehicle interior air heat exchanger 5, and the vehicle interior air heat. A heat pump cooling device configured by a blower device for an exchanger 6; a coil temperature detecting device 12 arranged in the electric compressor 7 for detecting a coil temperature of a motor;
A control device 13 for reducing the number of rotations of the electric compressor 7 to a set value when the temperature detected by the coil temperature detection device 12 exceeds a certain temperature is arranged outside. The flow of the refrigerant is the same as in the conventional example. Therefore, the description is omitted.

In the air conditioner for an automobile constructed as described above, when the motor coil temperature of the electric compressor 7 becomes high, the rotational speed of the electric compressor 7 can be lowered, so that the electric compression is performed. The motor coil temperature can be lowered without stopping the machine 7.

Although the refrigerant expansion device has been described as the mechanical expansion valve 4 in the drawing, the same effect can be obtained when a capillary tube is used.

Further, in the figure, the description has been made for the cooling cycle, but the same effect can be obtained in the heat pump cooling / heating cycle in which the four-way switching valve and the like are added.

The present invention according to claim 4 is intended for compressor control that does not stop in an automobile air conditioner that uses an electric compressor, and control that does not cause overcurrent when restarting.

FIG. 4 is a block diagram of an embodiment of the automobile air conditioner according to the present invention. In FIG. 4, the electric compressor 7, the vehicle exterior air heat exchanger 2, the vehicle exterior air heat exchanger blower 3, the mechanical expansion valve 4, the vehicle interior air heat exchanger 5, and the vehicle interior air heat are shown. A heat pump cooling device including an air blower device 6 for the exchanger, a vehicle interior air heat exchanger temperature detecting device 8 for detecting an outlet side air temperature or a surface temperature of the vehicle interior air heat exchanger 5, and an external timer. 14 and when the temperature detected by the vehicle interior air heat exchanger temperature detecting device 8 becomes equal to or lower than a certain temperature, the rotational speed of the electric compressor 7 is reduced to a set value. The controller 15 stops the electric compressor 7 when the temperature becomes lower than the set temperature set lower than the set temperature described above, and restarts the electric compressor 7 after a predetermined time by a signal from the timer 14. , And the flow of the refrigerant is the same as that of the conventional example, and the description thereof will be omitted.

In the vehicle air conditioner configured as described above, when the vehicle interior air heat exchanger 5 is frozen,
Since the rotation speed of the electric compressor 7 can be reduced,
It becomes possible to release the freezing without stopping the electric compressor 7.

If the freezing cannot be released by the method of lowering the rotational speed, the freezing can be surely released by stopping the electric compressor 7. Further, the signal from the timer 14 causes the electric compression after a certain time. By performing the control for restarting the machine 7, a large current does not flow at the time of restart, and it becomes possible to avoid the restart impossible state due to the current protection.

Although the refrigerant expansion device has been described as the mechanical expansion valve 4 in the drawing, the same effect can be obtained even when a capillary tube is used.

Further, in the figure, the description has been given for the cooling cycle, but instead of controlling the temperature of the vehicle interior air heat exchanger 5 by adding a four-way switching valve or the like, the vehicle exterior air heat exchanger 2
By attaching the temperature detection device to the, it is possible to avoid the defrosting operation mode during the heating operation without stopping the electric compressor when the outside air temperature is high to some extent (about 2 ° C. or higher).

The present invention according to claim 5 is intended for compressor control that does not stop in an automobile air conditioner that uses an electric compressor, and control that does not cause overcurrent when restarting.

FIG. 5 is a block diagram of an embodiment of the automobile air conditioner of claim 5. In FIG. 5, the electric compressor 7, the vehicle exterior air heat exchanger 2, the vehicle exterior air heat exchanger blower 3, the mechanical expansion valve 4, the vehicle interior air heat exchanger 5, and the vehicle interior air heat are shown. A heat pump cooling device configured by a blower device 6 for an exchanger, a discharge temperature detecting device 10 for detecting a discharge temperature of the electric compressor 7, a temperature detected by a timer 14 and the discharge temperature detecting device 10 are constant outside. When the temperature exceeds the temperature, the rotation speed of the electric compressor 7 is reduced to a set value. A control device 16 that stops the electric compressor 7 when the set temperature is set higher than the set temperature described above and restarts the electric compressor 7 after a predetermined time by a signal from the timer 14. , And the flow of the refrigerant is the same as that of the conventional example, and the description thereof will be omitted.

In the air conditioner for an automobile constructed as described above, when the discharge temperature of the electric compressor 7 rises, the rotation speed of the electric compressor 7 can be lowered, so that the electric compressor 7 is operated. It is possible to reduce the discharge temperature without stopping.

If the discharge temperature cannot be reduced by the method of lowering the number of revolutions, the discharge temperature can be surely reduced by stopping the electric compressor 7. Further, a signal from the timer 14 causes a predetermined time to elapse. By controlling the electric compressor 7 to restart, a large current does not flow at the time of restart, and it becomes possible to avoid a restart impossible state due to current protection.

Although the refrigerant expansion device has been described as the mechanical expansion valve 4 in the drawing, the same effect can be obtained even when a capillary tube is used.

Although the cooling cycle has been described in the figure, the same effect can be obtained in a heat pump cooling / heating cycle in which a four-way switching valve and the like are added.

The present invention according to claim 6 is intended for compressor control that does not stop in an automobile air conditioner that uses an electric compressor, and control that does not cause an overcurrent when restarting.

FIG. 6 is a block diagram of an embodiment of the automobile air conditioner of claim 6. In FIG. 6, the electric compressor 7, the vehicle exterior air heat exchanger 2, the vehicle exterior air heat exchanger blower 3, the mechanical expansion valve 4, the vehicle interior air heat exchanger 5, and the vehicle interior air heat. A heat pump cooling device configured by a blower device 6 for an exchanger, and a coil temperature detecting device 12 arranged inside the electric compressor 7 for detecting a coil temperature of a motor.
When the temperature detected by the timer 14 and the coil temperature detection device 12 reaches a certain temperature or more outside, the electric compressor 7
Reduce the rotation speed of to the set value. A control device that stops the electric compressor 7 when the set temperature is set higher than the set temperature and restarts the electric compressor 7 after a predetermined time by a signal from the timer 14. Since the flow of the refrigerant in which 15 is arranged is the same as that of the conventional example, description thereof will be omitted.

In the air conditioner for an automobile constructed as described above, when the coil temperature of the electric compressor 7 rises, the rotational speed of the electric compressor 7 can be lowered, so that the electric compressor 7 can be operated. It is possible to reduce the coil temperature without stopping.

If the coil temperature cannot be reduced by the method of lowering the number of revolutions, the coil temperature can be surely reduced by stopping the electric compressor 7. Further, a signal from the timer 14 causes a predetermined time to elapse. By controlling the electric compressor 7 to restart, a large current does not flow at the time of restart, and it becomes possible to avoid a restart impossible state due to current protection.

Although the refrigerant expansion device is described as the mechanical expansion valve 4 in the drawing, the same effect can be obtained even when a capillary tube is used.

Further, in the figure, the cooling cycle has been described, but the same effect can be obtained in the heat pump cooling / heating cycle in which a four-way switching valve and the like are added.

It is an object of the present invention to perform a compressor control which does not stop in an automobile air conditioner using an electric compressor and a control with a good cool down characteristic.

FIG. 7 is a block diagram of an embodiment of the automobile air conditioner of claim 7. In FIG. 7, an electric compressor 7, a vehicle exterior air heat exchanger 2, a vehicle exterior air heat exchanger blower 3, a mechanical expansion valve 4, a vehicle interior air heat exchanger 5, and a vehicle interior air heat exchanger. A heat pump cooling device including an air blower device 6 for the exchanger, a vehicle interior air heat exchanger temperature detecting device 8 for detecting an outlet side air temperature or a surface temperature of the vehicle interior air heat exchanger 5, and an external timer. 18, a setting panel 19 for setting the rotation speed of the electric compressor 7, and a timer 18 for operating the electric compressor 7 at a constant rotation speed for a predetermined time when the electric compressor 7 is started, and after a predetermined time, the setting panel 19 The electric compressor 7 is operated at the set rotation speed, and when the temperature detected by the vehicle interior air heat exchanger temperature detection device 8 becomes equal to or lower than a certain temperature, the electric compressor 7
A control device 20 for reducing the number of rotations to the set value is arranged. The flow of the refrigerant is the same as that of the conventional example, and thus the description thereof is omitted.

In the vehicle air conditioner configured as described above, when the indoor heat exchanger is frozen, the rotation speed of the electric compressor 7 can be lowered, so that the electric compressor 7 can be stopped without stopping. It is possible to release the freeze.

Further, the cool down characteristic can be improved by operating the electric compressor 7 at a constant rotation speed for a predetermined time at the time of startup.

Although the refrigerant expansion device is described as the mechanical expansion valve 4 in the drawing, the same effect can be obtained even when a capillary tube is used.

Further, in the drawing, the description has been given for the cooling cycle, but instead of controlling the temperature of the vehicle interior air heat exchanger 5 by adding a four-way switching valve and the like, the vehicle exterior air heat exchanger 2 is replaced.
By attaching the temperature detecting device to the air conditioner, it is possible to avoid the defrosting operation mode during the heating operation without stopping the electric compressor 7 when the outside air temperature is high to some extent (about 2 ° C. or more), and the pulling operation is performed. It is possible to improve the up characteristic.

[0062]

【The invention's effect】

(Claim 1) When the indoor heat exchanger freezes, the freeze can be released without stopping the electric compressor.

(Claim 2) When the discharge temperature of the electric compressor rises, the discharge temperature can be reduced without stopping the electric compressor.

(Claim 3) When the motor coil temperature inside the electric compressor rises, the coil temperature can be reduced without stopping the electric compressor.

(Claim 4) When the indoor heat exchanger is frozen, the freeze can be released without stopping the electric compressor. Further, if it freezes from that state, the freeze can be surely released by stopping the compressor. Further, with respect to the restart of the electric compressor, since the timer can control not to start the electric compressor for a certain period of time, the restart can be performed without activating the large current protection.

(Claim 5) When the discharge temperature rises,
The discharge temperature can be reduced without stopping the electric compressor. If the discharge temperature should rise from that state, the discharge temperature can be surely reduced by stopping the compressor. Further, with respect to the restart of the electric compressor, since the timer can control not to start the electric compressor for a certain period of time, the restart can be performed without activating the large current protection.

(Claim 6) When the motor coil temperature of the electric compressor rises, the motor coil temperature can be reduced without stopping the electric compressor. If the motor coil temperature rises from that state, the motor coil temperature can be surely reduced by stopping the compressor. Further, with respect to the restart of the electric compressor, since the timer can control not to start the electric compressor for a certain period of time, the restart can be performed without activating the large current protection.

(Claim 7) Since the electric compressor can be operated at a constant rotation speed for a certain time when the electric compressor is started, the cool down characteristic can be improved. Further, when the indoor heat exchanger freezes, the freeze can be released without stopping the electric compressor.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an automobile air conditioner according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of an automobile air conditioner according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a vehicle air conditioner according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram of a vehicle air conditioner according to a fourth embodiment of the present invention.

FIG. 5 is a configuration diagram of a vehicle air conditioner according to a fifth embodiment of the present invention.

FIG. 6 is a configuration diagram of a vehicle air conditioner according to a sixth embodiment of the present invention.

FIG. 7 is a configuration diagram of an automobile air conditioner according to a seventh embodiment of the present invention.

FIG. 8 is a block diagram of a conventional air conditioning system for a vehicle driven by a fuel engine.

[Explanation of symbols]

 1 Compressor 2 Outside Air Heat Exchanger 3 Blower for Outside Air Heat Exchanger 4 Mechanical Expansion Valve 5 Inside Air Heat Exchanger 6 Inside Air Heat Exchanger Blower 7 Electric Compressor 8 Inside Air Heat Exchange Device temperature detection device 9 control device 10 discharge temperature detection device 11 control device 12 coil temperature detection device 13 control device 14 timer 15 control device 16 control device 17 control device 18 timer 19 setting panel 20 control device

Claims (7)

[Claims] 1. An electric compressor, an outside air heat exchanger for a vehicle, an air blower for outside air heat exchanger, an inside air heat exchanger, an air blower for inside air heat exchanger, and a mechanical expansion valve. Alternatively, a heat pump cooling device configured with a refrigerant expansion device of either one of the capillary tubes, and a vehicle interior air heat exchanger temperature detection device that detects an outlet side air temperature or a surface temperature of the vehicle interior air heat exchanger. A vehicle air conditioner equipped with a control device for reducing the rotational speed of the electric compressor to a set value when the temperature detected by the vehicle interior air heat exchanger temperature detection device is below a certain temperature. 2. A heat pump air conditioner according to claim 1, a discharge temperature detecting device for detecting a discharge temperature of the electric compressor, and the electric compression when the temperature detected by the discharge temperature detecting device reaches a predetermined temperature or more. An air conditioning system for automobiles equipped with a control device that reduces the rotation speed of the machine to a set value. 3. A heat pump air conditioner according to claim 1, a coil temperature detecting device for detecting a motor coil temperature inside the electric compressor, and a coil temperature detecting device outside when the detected temperature of the coil temperature detecting device exceeds a certain temperature. An automobile air conditioner equipped with a control device that reduces the rotation speed of an electric compressor to a set value. 4. A timer externally provided, and when the temperature detected by the vehicle interior air heat exchanger temperature detector falls below a set value which is set lower than the set value, the electric compressor is stopped and the timer is operated. The vehicle air conditioner according to claim 1, further comprising a control device that restarts the electric compressor after a certain period of time in response to the signal. 5. An electric timer is externally provided, and when the temperature detected by the discharge temperature detection device exceeds a set value higher than the set value, the electric compressor is stopped and a signal from the timer causes a fixed time. The vehicle air conditioner according to claim 2, further comprising a control device that restarts the electric compressor later. 6. An electric timer is externally provided, and when the temperature detected by the coil temperature detecting device exceeds a set value higher than the set value, the electric compressor is stopped and a signal from the timer causes a fixed time. The vehicle air conditioner according to claim 3, further comprising a control device that restarts the electric compressor later. 7. An automobile air conditioner according to claim 1, an external timer, and a setting panel for setting the rotation speed of the electric compressor.
For a motor vehicle equipped with a control device for operating the electric compressor at a constant rotation speed for a predetermined time when the electric compressor is started by the timer, and further operating the electric compressor at the rotation speed set by the setting panel after a predetermined time. Air conditioner.