JPH0769045A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To prevent frost of an evaporator, and remove cloudiness of window glass even when a car outdoor temperature is lowered to a prescribed temperature or less. CONSTITUTION:A heater core 5 is arranged in a duct 2 so as to heat air cooled by an evaporator 4 by using cooling water of an internal combustion engine, and an ECU6 is arranged in an automatic air conditioner 1 for an automobile so as to carry out frost cut control according to detecting signals of an outside air temperature sensor 33 and an after evaporation temperature sensor 35. Even when a car outdoor temperature is lowered to a prescribed temperature or less and a car indoor temperature is also low and car indoor relative humidity is high when an occupant gets on a vehicle and starts the internal combustion engine, if a stopping indication temperature of a compressor 18 is reset to a target temperature lower than usual, even if a detecting temperature of the after evaporation temperature sensor 35 is lowered to an ordinary target temperature or less, blowoff air by the evaporator 4 can be dehumidified.

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, and more particularly to a vehicle air conditioner in which a stop instruction temperature of a compressor for compressing and discharging a refrigerant evaporated in an evaporator of a refrigeration cycle is changed. Involve

[0002]

2. Description of the Related Art When a vehicle is stopped and the internal combustion engine starts to start, the temperature of the cooling water flowing from the internal combustion engine to the heater core is low, the temperature inside the vehicle interior is not controlled, and the temperature outside the vehicle interior is not controlled. When the temperature falls below 0 ° C, the temperature inside the vehicle is also close to the temperature outside the vehicle, and the relative humidity inside the vehicle is high due to the exhaled air generated by the passengers. The glass tends to fog.

Therefore, if the dehumidifying operation of the vehicle air conditioner is started, it is possible to remove the fogging of the window glass, but generally, the cooling temperature of the evaporator is set to the instruction temperature for stopping the compressor (for example, 3 in order to prevent the frost of the evaporator). When it falls below ℃), the compressor is turned off.

Therefore, when the temperature outside the vehicle compartment is lowered to 0 ° C. or lower at the start of starting the internal combustion engine, the cooling temperature of the evaporator does not become higher than that temperature.
Therefore, the dehumidifying operation of the vehicle air conditioner cannot be performed, and the fogging of the window glass is removed for about 5 minutes after the internal combustion engine is started until the cooling water of the internal combustion engine flowing into the heater core rises above a predetermined water temperature. I couldn't.

Therefore, for example, in Japanese Utility Model Laid-Open No. 57-85167, when the temperature outside the passenger compartment is lower than 0 ° C., a certain time elapses after the manual operation of the force switch installed on the operation panel. Until then, there is described a technique for forcibly operating the compressor to remove the fogging of the window glass in winter.

[0006]

However, in the prior art, when the temperature outside the passenger compartment is lower than 0 ° C., the forced switch is manually operated to forcibly operate the compressor for a fixed time. In this case, the cooling temperature of the evaporator is much lower than the instruction temperature for stopping the compressor, so that there is a problem that the evaporator is frosted.

The present invention relates to a vehicle air conditioner capable of preventing the cooling means from frosting even when the temperature outside the vehicle compartment is lower than a predetermined temperature and removing the fog on the window glass. For the purpose of provision.

[0008]

According to the present invention, a duct for sending air into a passenger compartment, a cooling means for cooling air flowing in the duct, and a cooling water for an internal combustion engine are used to form the inside of the duct. It has a heating means for heating the flowing air and a cooling temperature detecting means for detecting the cooling temperature of the air cooled by the cooling means, and the cooling temperature detected by the cooling temperature detecting means is the stop instruction temperature of the cooling means. And a control device for stopping the operation of the cooling means when the temperature drops below, the control device has a vehicle exterior temperature detection means for detecting a temperature outside the vehicle interior, and when the internal combustion engine starts to start, the vehicle When the temperature outside the vehicle compartment detected by the outdoor temperature detecting means is lower than a predetermined temperature, the stop instruction temperature of the cooling means is set to a target temperature lower than usual until the internal combustion engine reaches a predetermined operating state. Setting The technical means to be adopted.

[0009]

According to the present invention, when the temperature outside the passenger compartment is lower than a predetermined temperature, the cooling water of the internal combustion engine flowing into the heating means is stabilized, that is, the internal combustion engine is brought into a predetermined operating state. Until the temperature is reached, the stop instruction temperature of the cooling means is set to a target temperature lower than usual. As a result, even if the temperature outside the passenger compartment falls below a predetermined temperature, the cooling means continues to operate until it falls below a target temperature that is lower than normal, so that the air flowing inside the duct toward the passenger compartment is It is cooled and dehumidified. Therefore, at the time of starting the internal combustion engine, the temperature outside the vehicle interior has dropped below a predetermined temperature, the temperature inside the vehicle interior is low, and the relative humidity inside the vehicle interior is high. Since the blown air is blown out, the fog on the window glass of the vehicle is removed.

Further, when the temperature outside the vehicle compartment is lower than a predetermined temperature, the cooling temperature detected by the cooling temperature detecting means is lower than usual until the internal combustion engine reaches a predetermined operating state. By stopping the operation of the cooling means when the temperature falls below the temperature, the cooling temperature of the cooling means does not decrease to the frosting temperature. Therefore, even if the stop instruction temperature of the cooling means is set to a target temperature lower than usual, the generation of frost in the cooling means is suppressed.

[0011]

【Example】

[Configuration of Embodiment] Next, a vehicle air conditioner of the present invention will be described based on an embodiment shown in FIGS. 1 to 6.
Here, FIG. 1 is a diagram showing an automobile air conditioner.

The automobile air conditioner 1 is provided with a duct 2 for introducing air into the passenger compartment, and is arranged on the upstream side of the duct 2.
A sirocco-type blower 3 that sends air into the vehicle compartment through the duct 2, an evaporator 4 that cools the air that flows in the duct 2, a heater core 5 that heats the air that flows in the duct 2, and a control device that controls each air conditioner ( Hereinafter referred to as ECU) 6.

The blower 3 comprises a blower case 3a, a centrifugal fan 3b and a blower motor 3c, and the rotation speed of the blower motor 3c is determined according to the voltage applied to the blower motor 3c. The blower voltage is controlled based on a control signal from the ECU 6 via the blower drive circuit 7 (see FIG. 2).

The blower case 3a is formed with an inside air introduction port 8 for introducing the air inside the vehicle (inside air) and an outside air introduction port 9 for introducing the air outside the vehicle (outside air). An inside / outside air switching damper 10 for selectively opening / closing the inside air introduction port 8 and the outside air introduction port 9 is rotatably attached.

On the downstream side of the duct 2, a defroster duct 2a, a face duct 2b, and a foot duct 2c are branched, and the ends of the ducts 2a to 2c are opened into the vehicle interior. It is used as the foot outlet 13.

Defroster duct 2a and face duct 2
An outlet switching damper 14 that selectively opens and closes the defroster duct 2a and the face duct 2b according to the outlet mode is rotatably attached to the upstream opening of b. An outlet switching damper 15 that opens and closes the foot duct 2c according to the outlet mode is rotatably attached to the upstream opening of the foot duct 2c.

The defroster outlet 11 is opened so that the blown air is blown toward the window glass 16 of the automobile, and the face blower outlet 12 is opened so that the blown air is blown toward the head and chest of the occupant. The outlet 13 is opened so that blown air is blown toward the foot of the occupant.

The evaporator 4 is the cooling means of the present invention, and is arranged in the duct 2 on the downstream side of the blower 3 to exchange air between the air blown by the blower 3 and the refrigerant flowing into the air. It is a refrigerant evaporator that cools the refrigeration cycle and is one of the elements that constitute the refrigeration cycle 23.

The refrigeration cycle 23 is connected by a refrigerant pipe 24 so that the refrigerant circulates to the evaporator 4 via a condenser 20, a receiver 21, and an expansion valve 22 which receive air from the compressor 4 and a cooling fan 19 from the evaporator 4. Is. The compressor 18 is rotationally driven by the internal combustion engine via the electromagnetic clutch 17 and discharges a high-temperature, high-pressure gas refrigerant. The electromagnetic clutch 17 is controlled based on a control signal from the ECU 6 via the clutch drive circuit 25.

The heater core 5 is the heating means of the present invention and is arranged in the duct 2 on the downstream side of the evaporator 4.
The cooling water of the internal combustion engine is used as a heat source to heat the air passing through the heater core 5. The heater core 5 has a bypass path 2 through which air flowing in the duct 2 bypasses the heater core 5.
6 is provided at a biased position. The ratio of the amount of air passing through the bypass path 26 to the amount of air passing through the heater core 5 is adjusted by an air mix damper 27 rotatably mounted on the upstream side of the heater core 5.

The ECU 6 has a built-in CPU, ROM, RAM, etc., and as shown in FIG.
The operation signal output from the sensor and the detection signal from each sensor described later are input. In addition, the ECU 6 performs various arithmetic processes based on these input signals and a control program for air conditioning control of the vehicle interior, and the inside / outside air switching damper 1 is executed.
0, blower outlet switching dampers 14, 15, servo motors 29, 30, 31 for driving the air mix damper 27, a blower driving circuit 7 for driving the blower motor 3c of the blower 3, and a clutch driving circuit 25 for driving the electromagnetic clutch 17.
Output a control signal to.

As the above-mentioned sensor, an inside air temperature sensor 32,
The outside air temperature sensor 33, the solar radiation sensor 34, the post-evaporation temperature sensor 35, the water temperature sensor 36, and the like are used. The inside air temperature sensor 32 detects the temperature (inside air temperature) Tr of the vehicle interior,
A detection signal according to the detected temperature is output to the ECU 6.
The outside air temperature sensor 33 is the vehicle outside temperature detecting means of the present invention, detects the temperature outside the vehicle (outside air temperature) Tam, and outputs a detection signal corresponding to the detected temperature to the ECU 6.

The solar radiation sensor 34 detects the amount of solar radiation Ts that has entered the passenger compartment, and outputs a detection signal corresponding to the detected temperature to the EC.
Output to U6. The after-evaporation temperature sensor 35 is the cooling temperature detecting means of the present invention, and indicates the cooling temperature of the air cooled by the evaporator 4 (cooling capacity of the evaporator 4), that is, the outlet air temperature (after-evaporating temperature) Te of the evaporator 4. It detects and outputs the detection signal according to the detected temperature to ECU6. The cooling temperature detecting means may be a temperature sensor that detects the fin temperature of the evaporator 4. The water temperature sensor 36 detects the water temperature Tw of the cooling water of the internal combustion engine and outputs a detection signal corresponding to the detected temperature to the ECU 6.

The air conditioner operation panel 28 is disposed on the instrument panel in the passenger compartment, and has a temperature setting switch 37 and a compressor 18 for setting the passenger's desired indoor temperature.
Air conditioner switch 38 for instructing the ECU 6 to drive the air conditioner, and the outlet mode selector switch 3 for switching the outlet mode.
9, a suction port mode switch 40 for switching the suction port mode, a fan switch 41 for adjusting the air volume of the centrifugal fan 3b, an off switch 42, and the like are provided.

Here, the frost cut control of the compressor 18 when the automatic air conditioner is selected will be described. EC
As shown in the control characteristic of FIG. 3, U6 is the clutch drive circuit 2 depending on the post-evaporation temperature Te of the post-evaporation temperature sensor 35.
By turning on and off the electromagnetic clutch 17 via 5, the operation of the compressor 18 and the stop of the operation are controlled, and the frost cut control for preventing the frost of the evaporator 4 is performed. The compressor 18 also stops when the air conditioner switch 38 is manually turned off the electromagnetic clutch 17.

Specifically, as shown in the control characteristic of FIG. 3, the post-evaporation temperature Te of the post-evaporation temperature sensor 35 is the normal target temperature TeOFF1 of the stop instruction temperature of the compressor 18.
When the temperature falls below (for example, 3 ° C.), the electromagnetic clutch 17 is turned off via the clutch drive circuit 25 to stop (turn off) the operation of the compressor 18.

Further, as shown in the control characteristic of FIG. 3, the post-evaporation temperature Te of the post-evaporation temperature sensor 35 is the normal target temperature TeON1 (= Te of the operation instruction temperature of the compressor 18).
OFF1 + 1 ° C .: When the temperature rises above 4 ° C.), the electromagnetic clutch 17 is turned on via the clutch drive circuit 25 to restart (turn on) the operation of the compressor 18.

In the frost cut control of the compressor 18 of this embodiment, when the outside air temperature is lower than a predetermined temperature (for example, 5 ° C.), the ignition switch (not shown) is turned on for a fixed time (for example, Until 5 minutes) elapses, the stop instruction temperature of the compressor 18 is set to a target temperature TeOFF2 (eg, -10 ° C) lower than usual, and the operation instruction temperature of the compressor 18 is set to a target temperature TeON2 (TeOFF2 + 2 ° C: eg- 8 ° C)
Is set to.

When the target temperature TeOFF2, which is lower than usual, is set, it is set based on the graph of FIG. 4 so that the evaporator 4 does not frost. For example, if the outside air temperature is 5 ° C. at the start of starting the internal combustion engine, the frost temperature of the evaporator 4 is −9 ° C., so TeOFF2 may be set to a temperature higher than this temperature (eg, −10 ° C.). If the outside air temperature is 0 ° C. at the start of starting the internal combustion engine, the frost temperature of the evaporator 4 is −11 ° C., so TeOFF2 may be set to a temperature higher than this temperature (eg, −10 ° C.). Further, if the outside air temperature is −5 ° C. at the start of starting the internal combustion engine, since the frost temperature of the evaporator 4 is −13 ° C., TeOF is brought to a temperature higher than this temperature (eg, −12 ° C.).
Set F2. Therefore, the lower the outside air temperature, the lower the target temperature TeOFF2 which is lower than usual can be set to a lower temperature.

[Operation of Embodiment] Next, the operation of the automobile air conditioner 1 will be briefly described with reference to FIGS. 1 to 6. The ECU 6 starts a control program when the ignition switch is turned on, and executes calculation and processing according to the flowchart of FIG.

First, various control timers are initialized (step S1). Next, the set temperature Tset is read from the temperature setting switch 37 (step S2). Subsequently, input signals are read from various sensors in order to detect a vehicle environmental state that affects the air conditioning state in the vehicle interior. That is,
The inside air temperature Tr detected by the inside air temperature sensor 32, the outside air temperature Tam detected by the outside air temperature sensor 33, the amount of solar radiation Ts detected by the insolation sensor 34, the after-evaporation temperature Te detected by the after-evaporation temperature sensor 35, and the water temperature. The cooling water temperature Tw detected by the sensor 36 is read (step S3).

Next, various input data (inside air temperature Tr, outside air temperature Tam, insolation amount T) read into the ECU 6 as described above.
s) and the following formula 1 is used to calculate the target outlet temperature TAO of the air blown into the passenger compartment (step S4).

[Equation 1] TAO = Kset-Tset-Kr-Tr-Kam-Tam-Ks-Ts + C

Here, Kset is a temperature setting gain, Tset
Is the set temperature set by the temperature setting switch 37, Kr is the inside air temperature gain, Tr is the inside air temperature detected by the inside air temperature sensor 32, Kam is the outside air temperature gain, Tam is the outside air temperature detected by the outside air temperature sensor 33, Ks is the solar gain, Ts is the amount of solar radiation detected by the solar sensor 34, and C is a correction constant.

Subsequently, the air volume of the centrifugal fan 3b is set based on the control characteristics for determining the blower voltage according to the target blowout temperature TAO stored in advance. That is, the blower voltage applied to the blower motor 3c via the blower drive circuit 7 is set (step S5). And
The target opening degree SW of the air mix damper 27 is calculated based on the following equation (2) (step S6).

## EQU00002 ## SW = {(TAO-Te) / (Tw-Te)} * 100 (%)

Here, Te is the post-evaporation temperature detected by the post-evaporation temperature sensor 35 (cooling capacity signal of the evaporator 4), and Tw is the water temperature detected by the water temperature sensor 36.

Next, the target outlet temperature T stored in advance is stored.
The outlet mode is determined based on the control characteristics for determining the outlet mode according to AO and the set position of the outlet switch such as the outlet mode switch 39 (step S7). Next, the target outlet temperature TAO stored in advance
The inlet mode is determined based on the control characteristic for determining the inside / outside air introduction mode and the set position of the inlet mode changeover switch 40 (step S8). Then, the frost cut control which is the main content of the present invention is performed (step S9).

Next, the blower drive circuit 7 and the servo motors 29 to 3 are supplied with the control signals determined in steps S5 to S9.
1 and the clutch drive circuit 25 to output the centrifugal fan 3b, the inside / outside air switching damper 10, the outlet switching damper 1
4, 15 and the air mix damper 27 are operated, and the electromagnetic clutch 17 of the compressor 18 is turned on / off (step S10).

Next, it is judged whether or not the control cycle time ta has elapsed after executing the processing of step S10 (step S11). If the result of this judgment is No, the control cycle time ta is judged to have elapsed. wait. Moreover, the judgment result is Yes.
In the case of, the process returns to step S2, and the above calculation and process are repeated. By repeating the above calculation and processing, the automobile air conditioner 1 is automatically controlled.

Next, the frost cut control in the ECU 6 will be described in detail. Here, FIG. 6 is a flowchart showing a frost cut control program. The flowchart of FIG. 6 starts when the process of step S8 of the flowchart of FIG. 5 ends.

First, after starting the internal combustion engine,
That is, it is determined whether or not a predetermined time tb (for example, 5 minutes) has elapsed since the ignition switch was turned on (IG / ON) (step S21). This step S
When the determination result of 21 is Yes, it is determined whether the air conditioner switch 38 is on (A / C switch / ON) (step S22). If the determination result in step S22 is No, a control signal for turning off the electromagnetic clutch 17 of the compressor 18 is output (step S23), and the frost cut control is exited.

Further, the determination result of step S22 is Yes.
In the case of, it is determined whether or not the electromagnetic clutch 17 is currently on (ON) (step S24). If the result of the determination in step S24 is Yes, it is determined whether or not the post-evaporation temperature Te detected by the post-evaporation temperature sensor 35 has dropped below the normal target temperature TeOFF1 (for example, 3 ° C.) (step S25).

If the determination result of step S25 is Yes, the process of step S23 is performed. If the decision result in the step S25 is No, the frost cut control is exited.

When the result of the determination in step S24 is No, the post-evaporation temperature Te from the post-evaporation temperature sensor 35 is Te.
It is determined whether the temperature has risen above the normal target temperature TeON1 (for example, 4 ° C.) (step S26). If the determination result of step S26 is Yes, a control signal for turning on the electromagnetic clutch 17 of the compressor 18 is output (step S27), and the frost cut control is exited. If the decision result in the step S26 is No, the frost cut control is ended.

If the result of the determination in step S21 is No, it is determined whether or not the outside air temperature Tam from the outside air temperature sensor 33 has dropped below a predetermined temperature TA (for example, 5 ° C.) (step S28). ). If the determination result in step S28 is No, the process proceeds to step S22.

Further, the determination result of step S28 is Yes.
In the case of, it is determined whether or not the electromagnetic clutch 17 is currently turned on (ON) (step S29). When the result of the determination in step S29 is Yes, it is determined whether or not the post-evaporation temperature Te from the post-evaporation temperature sensor 35 has dropped to a target temperature TeOFF2 (eg, -10 ° C.) or lower which is lower than usual (step S29). S30). This step S30
If the result of the determination is Yes, the process proceeds to step S23. If the determination result of step S30 is No, the frost cut control is exited.

If the determination result in step S29 is No, the post-evaporation temperature Te from the post-evaporation temperature sensor 35 is Te.
Is higher than the target temperature TeON2 (e.g., -8 [deg.] C.) which is lower than usual (step S31).
If the determination result in step S31 is Yes, the process proceeds to step S27. In addition, step S31
If the result of the determination is No, the frost cut control is exited.

As described above, when the outside air temperature Tam has fallen below the predetermined temperature TA (for example, 5 ° C.) when getting on the automobile, it takes a certain time (for example, 5 minutes) after the internal combustion engine is started. Until the time elapses, that is, until the water temperature Tw of the cooling water of the internal combustion engine flowing into the heater core 5 reaches a water temperature (for example, 40 ° C.) at which the temperature inside the vehicle compartment can be controlled, the stop instruction temperature of the compressor 18 is set to a target temperature lower than usual. T
eOFF2 (for example, -10 ° C) is changed.
Further, the operation instruction temperature of the compressor 18 is changed to a target temperature TeON2 (eg, -8 ° C) lower than usual.

As a result, the outside air temperature Tam becomes equal to the predetermined temperature TA.
Even if the temperature falls below (for example, 5 ° C.) or lower, the operation of the compressor 18 is continued until it falls below the target temperature TeOFF2 (for example, −10 ° C.) lower than usual. For this reason, the refrigerant flowing into the evaporator 4 and the air flowing toward the vehicle interior through the duct 2 exchange heat to cool the air, whereby the air blown out into the vehicle interior is dehumidified.

[Effects of Embodiment] Therefore, in the automobile air conditioner 1, the outside air temperature Tam is the predetermined temperature TA (for example, 5) when the start of the internal combustion engine in which the occupant gets into the stopped automobile and turns on the ignition switch. C) or less, the inside temperature Tr is low, and the relative humidity in the vehicle compartment is high, the dehumidifying operation of the automobile air conditioner 1 is performed without any troublesome manual operation. And the window glass 16 of the automobile can be prevented from being fogged.

Further, in the automobile air conditioner 1, when the outside air temperature Tam is lower than a predetermined temperature TA (for example, 5 ° C.), a fixed time (for example, 5 minutes) has elapsed since the internal combustion engine was started. In the meantime, when the post-evaporation temperature Te falls below the target temperature TeOFF2 lower than usual, the electromagnetic clutch 17 is turned off and the operation of the compressor 18 is stopped, whereby the temperature of the evaporator 4 falls below the frost temperature. Therefore, the evaporator 4 can be prevented from frosting, and the dehumidifying capacity of the automobile air conditioner 1 can be prevented from lowering.

[Modification] In this embodiment, the stop instruction temperature of the compressor is set to a target temperature lower than usual until a fixed time elapses after the start of the internal combustion engine, but the cooling water of the internal combustion engine is set after the start of the internal combustion engine. The water temperature is a predetermined water temperature (for example, 4
The stop instruction temperature may be set to a target temperature lower than usual until the temperature rises above 0 ° C. Further, the stop instruction temperature of the compressor may be set to a target temperature lower than usual until the temperature of the lubricating oil of the internal combustion engine rises above a predetermined oil temperature.
Further, the present invention can be applied to a controllable target temperature of the compressor stop instruction temperature such as economy control.

Although the evaporator of the refrigeration cycle is used as the cooling means in this embodiment, a cooling component such as a Peltier element may be used as the cooling means. Further, not only the cooling capacity of the cooling means is turned on and off, but also the rotation speed of the compressor is changed by changing the frequency by the inverter, the capacity variable compressor is used, and the cooling capacity of the cooling means is changed widely. The present invention may be used for the thing.

[0053]

As described above, according to the present invention, the temperature outside the vehicle interior is lowered to a predetermined temperature or lower at the start of starting the internal combustion engine, the temperature inside the vehicle interior is low, and the relative humidity inside the vehicle interior is high. By setting the stop instruction temperature to a target temperature lower than the normal temperature, it is possible to achieve both prevention of frost of the cooling means and prevention of fogging of the window glass.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a schematic structure of an automobile air conditioner using the present invention.

FIG. 2 is a block diagram showing a schematic structure of an ECU using the present invention.

FIG. 3 is a characteristic diagram showing frost cut control characteristics with respect to post-evaporation temperature.

FIG. 4 is a graph showing a relationship between a target temperature lower than usual and an outside air temperature.

FIG. 5 is a flowchart showing a basic control program of the ECU.

FIG. 6 is a flowchart showing a frost cut control program of FIG.

[Explanation of symbols]

 1 Automotive Auto Air Conditioner (Vehicle Air Conditioner) 2 Duct 4 Evaporator (Cooling Means) 5 Heater Core (Heating Means) 6 ECU (Control Unit) 17 Electromagnetic Clutch 18 Compressor 33 Outside Air Temperature Sensor (Outside Room Temperature Detection Means) 35 Eva Rear temperature sensor (cooling temperature detection means)

Claims (1)

[Claims] 1. A duct for sending air into a passenger compartment, a cooling means for cooling the air flowing in the duct, and a heating means for heating the air flowing in the duct using cooling water of an internal combustion engine. A cooling temperature detecting means for detecting a cooling temperature of air cooled by the cooling means, and the cooling means when the cooling temperature detected by the cooling temperature detecting means falls below a stop instruction temperature of the cooling means. And a control device for stopping the operation of, the control device has a vehicle exterior temperature detection means for detecting the temperature of the vehicle exterior, at the start of starting the internal combustion engine, it was detected by the vehicle exterior temperature detection means. When the temperature outside the passenger compartment is lower than a predetermined temperature, the stop instruction temperature of the cooling means is set to a target temperature lower than usual until the internal combustion engine reaches a predetermined operating state. Use the air conditioner.