JP2009292431A - Air conditioner for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner for a vehicle capable of maintaining a further comfortable control state by suppressing the shift to a performance-limiting mode while suppressing the temperature rise of an inverter by operation of lowering the load of the refrigeration cycle in the higher load condition, in which the inverter temperature is expected to rise. <P>SOLUTION: In the air conditioner for the vehicle having an over-temperature mode 102d to protect the inverter 23, a controller 1 is provided with a temperature warning mode 102b, which increases air volume of a condenser fan 4 to a volume more than the volume during a normal mode 102a, in the normal mode 102a before being controlled by the over-temperature mode 102d. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention belongs to the technical field of vehicle air conditioners.

Conventionally, an inverter that drives an electric motor of an electric compressor drives an electric motor at a thermal protection rotational speed that is different from the rotation command value from the air conditioning control device when the temperature detected by the inverter temperature sensor exceeds a predetermined value. Operates in the overheat protection mode to ensure the refrigerant flow rate and to self-cool the inverter. At this time, when the condenser fan or the vehicle interior blower is in a stopped state, the condenser fan or the vehicle interior blower is activated (see, for example, Patent Document 1).
Japanese Patent Laying-Open No. 2005-274104 (page 2-16, full view)

  However, in the conventional vehicle air conditioner, if the condenser fan is stopped when the overheat protection mode is activated, it is activated. However, since the rotation speed of the electric compressor is restricted in the overheat protection mode, it is normal. It has been difficult to demonstrate air conditioning performance.

  The present invention has been made paying attention to the above-described problems, and the object of the present invention is to perform an operation for reducing the load of the refrigeration cycle even under a high load condition where the temperature of the inverter is likely to rise. An object of the present invention is to provide a vehicle air conditioner that can suppress a rise, suppress a transition to a mode that limits performance, and maintain a more comfortable control state.

  In order to achieve the above object, in the present invention, a compressor that compresses refrigerant in a refrigeration cycle, an electric motor that drives the compressor, an electric compressor that includes an inverter that drives and controls the electric motor, and the electric compressor, And a control means for controlling a device constituting a refrigeration cycle including at least a condenser that performs heat exchange of the refrigerant and a condenser ventilation means that ventilates the condenser. In the vehicular air conditioner provided with protection control means for restricting the operation of the electric compressor from normal control and protecting the inverter, the control means is controlled by the protection control means. In the previous normal control state, a warning control method for increasing the air volume of the condenser ventilation means than in the normal control state. With a, characterized in that.

  Therefore, in the present invention, even in a high load condition where the inverter temperature is likely to rise, the operation of reducing the load of the refrigeration cycle is performed to suppress the inverter temperature rise and shift to a mode in which the performance is limited. And a more comfortable control state can be maintained.

  Hereinafter, the embodiment which realizes the vehicle air conditioner of the present invention will be described with reference to the first embodiment corresponding to the first and second embodiments, the second embodiment corresponding to the first and third embodiments, and the claims. A description will be given based on the third embodiment corresponding to the inventions according to items 1 and 4.

First, the configuration will be described.
FIG. 1 is a schematic system explanatory diagram of a vehicle air conditioner according to a first embodiment.
The vehicle air conditioner includes a controller 1, an electric compressor 2, a condenser 3, a condenser fan 4, a liquid tank 5, an expansion valve 6, an evaporator 7, a blower fan 8, and a pressure sensor 9.
The controller 1 outputs control commands for the motor rotation speed of the electric compressor 2 and the rotation speed of the condenser fan 4 based on detection values of various sensors and operation inputs from a passenger (not shown).

The electric compressor 2 compresses the refrigerant to a high pressure by an electric motor and sends the refrigerant to the capacitor 3. Details will be described later.
The capacitor 3 is liquefied by heat radiation cooling so that the refrigerant exchanges heat with the outside.
The liquid tank 5 removes moisture and dust inside the refrigerant passing therethrough.

The expansion valve 6 expands the refrigerant to a low pressure and sends it to the evaporator 7. The expansion valve 6 may be an electromagnetic adjustment valve to which a function of controlling the refrigerant amount by a control command from the controller 1 is added.
The evaporator 7 performs heat exchange by evaporating the low-pressure refrigerant and cooling the ambient air.
The blower fan 8 sends the cooled air around the evaporator 7 into the vehicle interior.
The pressure sensor 9 detects the refrigerant discharge pressure of the electric compressor 2.

FIG. 2 is a perspective view of the electric compressor according to the first embodiment. FIG. 3 is a cross-sectional view of the electric compressor in the first embodiment.
In the electric compressor 2, an electric motor 21, a compressor 22, and an inverter 23 are integrated in series.
For example, the electric motor 21 is fixed to a shaft 211 that is rotatably supported, and includes a rotor 212 having a permanent magnet, and a stator 213 having an excitation coil that is disposed so as to cover the outer diameter direction of the rotor 212. It is.

  The compressor 22 extends the shaft 211 that is the output shaft of the electric motor 21 to the inside of the housing 225 that constitutes the compression chamber, and fixes the vane 224 to the vane rotor 223 provided radially. This is a drive structure for rotating the vane rotor 223.

Further, an inverter 23 is provided on the opposite side of the compressor 22 from the electric motor 21. The inverter 23 includes a circuit board 231 inside, and in accordance with a control command from the controller 1, for example, a PWM drive signal that becomes a pseudo alternating current to the electric motor 21 in accordance with a target rotation speed, a three-phase (U phase, W phase, V phase) coil Output to.
The circuit board 231 of the inverter 23 is provided with a temperature sensor 232 that detects the temperature of the inverter 23. This detected value is output from the inverter 23 to the controller 1.
Since the electric compressor 2 includes the inverter 23, the electric compressor 2 can be arranged with a simple wiring with a space-saving configuration.

  Then, as shown in FIG. 2, the electric compressor 2 takes in the refrigerant from the suction port 221, compresses the refrigerant to a high pressure by the compressor 22, and sends out the refrigerant from the discharge port 222.

FIG. 4 is a control block diagram of the controller 1.
The controller 1 includes a detected temperature from the temperature sensor 232 of the inverter 23, a discharge pressure of the electric compressor 2 from the pressure sensor 9, a detected temperature outside the vehicle compartment from the outside air temperature sensor 10, and a detection inside the vehicle interior from the inside air temperature sensor 11. The temperature and the amount of solar radiation from the solar radiation sensor 12 are input. Note that the outside air temperature sensor 10, the inside air temperature sensor 11, and the solar radiation sensor 12 are provided at positions suitable for detection.

The controller 1 includes a switching determination unit 101 and a control unit 102.
The switching determination unit 101 determines the control mode from the temperature of the inverter 23 from the temperature sensor 232 of the inverter 23 and outputs a switching command to the control unit 102.
The control unit 102 includes a normal mode 102a, a temperature warning mode 102b, a performance limited mode 102c, and an overtemperature mode 102d as control contents, and an inverter 23 based on the input from each sensor in the mode selected by the switching command. Control commands to the condenser fan 4 and other door actuators are output.

In the normal mode 102a, the rotational speeds of the electric compressor 2 and the condenser fan 4 are controlled so that the required temperature of the inside air temperature sensor 11 is obtained.
In the temperature warning mode 102b, control is performed so that the condenser fan 4 rotates faster than in the normal mode 102a.
In the performance limitation mode 102c, the electric compressor 2 and the condenser fan 4 are controlled after limiting the rotation speed for suppressing the inverter temperature set in advance.

The overtemperature mode 102d stops the operation of the electric compressor 2. Operation is permitted due to a decrease in inverter temperature.
In the first embodiment, the control unit 102 performs control by switching the mode of the control content in this way.

The operation will be described.
[Inhibition of function-limited control]
FIG. 5 is an explanatory diagram illustrating determination contents executed by the switching determination unit 101. FIG. 6 is an explanatory diagram showing the contents of control processing executed in the temperature alert mode.
In the vehicle air conditioner of the first embodiment, the temperature sensor 232 provided in the inverter 23 detects the temperature of the inverter 23 and switches the control mode.

When the control is performed in the normal mode 102a, when the internal temperature of the inverter 23 rises and reaches 85 ° C. or higher (reference numeral 201 in FIG. 5), the switching determination unit 101 switches to the temperature warning mode 102b.
In the temperature warning mode 102b, as shown in FIG. 6, a proportional relationship between the discharge pressure of the electric compressor 2 detected by the pressure sensor 9 and the rotational speed of the condenser fan 4 (FIG. 6 indicates the number of rotations for a certain time). Is controlled with an inclination at which the rotational speed of the condenser fan 4 is higher than usual.

Then, heat exchange in the condenser 3 proceeds, and the temperature of the refrigerant becomes lower than that in the normal control state. Thereby, cooling with respect to the heat generation of the inverter 23 is advanced, and the transition to the next performance limited mode 102c and further to the next overtemperature mode 102d is suppressed.
Thus, a state where normal air conditioning performance can be exhibited is maintained for a long time, and a more comfortable air conditioning environment is provided for a long time while sufficiently protecting the inverter 23.

In order to clarify the operation of the first embodiment, further explanation will be added below.
The electric compressor 2 according to the first embodiment has a structure in which the inverter 23 is disposed on the suction side and the electric motor 21 is disposed on the discharge side with respect to the compressor 22, and the inverter 23 is cooled by the suction refrigerant and the electric motor 21 is cooled by the discharge refrigerant. .
The discharged refrigerant has a relatively high temperature, and when the load is high, the temperature easily rises to about 130 ° C. to cool the electric motor 21.
Since the electric compressor 2 according to the first embodiment has a structure in which the electric motor 21, the compressor 22, and the inverter 23 are integrated, the temperature of the electric motor 21 is transferred to the inverter 23 via the compressor 22, and the temperature of the inverter 23 is increased. The structure is easy to go up.

However, the electric compressor 2 of the first embodiment has advantages such as space saving and easy wiring structure over the structure in which the inverter is separately provided and the cooling structure is separately provided as described above.
The first embodiment is advantageous in that this advantageous point is maintained, and further, while maintaining the inverter 23, the control state for obtaining a sufficient air-conditioning effect is maintained for as long as possible.

  Furthermore, the explanation about the case where the outside temperature is high is added. When the outside air temperature is high at around 40 ° C, if the air volume of the condenser fan 4 of the condenser 3 is constant, the condenser 3 is not cooled sufficiently and the pressure of the discharge gas is steady at 1.4 MPa, and the value rises to 3 MPa. End up. Along with this, the temperature of the discharge gas also rises. For example, the compression ratio of 0.2 Mpa → 1.4 Mpa increases from 0.3 Mpa → 3 Mpa by the compression heat. Here, in the first embodiment, the temperature and pressure of the discharge gas are decreased in order to increase the air volume of the capacitor fan 4 of the capacitor 3.

Next, the effect will be described.
In the vehicle air conditioner of the first embodiment, the effects listed below can be obtained.

  (1) A compressor 22 that compresses refrigerant in the refrigeration cycle, an electric motor 21 that drives the compressor 22, an electric compressor 2 that includes an inverter 23 that drives and controls the electric motor 21, an electric compressor 2, and heat of the refrigerant It has a controller 1 that controls a device that constitutes a refrigeration cycle including at least a condenser 3 that performs replacement and a condenser fan 4 that ventilates the condenser 3, and the controller 1 is used when the inverter 23 becomes hot. In the vehicle air conditioner including the overtemperature mode 102d that limits the operation of the electric compressor 2 from the normal control and protects the inverter 23, the controller 1 performs the normal mode before the control in the overtemperature mode 102d is performed. 102a, temperature warning to increase the air volume of the condenser fan 4 larger than the normal mode 102a Since the inverter 102b is provided, even in high load conditions where the inverter temperature is likely to rise, operation to reduce the load on the refrigeration cycle is performed to suppress the inverter temperature rise and suppress the transition to a mode that limits performance Thus, a more comfortable control state can be maintained.

  (2) In the above (1), the temperature sensor 232 for detecting the temperature of the inverter 23 is provided, and the controller 1 performs control in the overtemperature mode 102d when the predetermined temperature threshold is exceeded from the normal mode 102a, and the overtemperature Since the control in the temperature warning mode 102b is performed by using the threshold value that is lower than the temperature threshold value in the mode 102d, the capacitor fan 4 is in a temperature state before being controlled in the overtemperature mode 102d with respect to the high temperature of the inverter 23. The temperature warning mode 102b is set to increase the air volume of the inverter in comparison with the normal mode 102a, and the inverter temperature rise is suppressed by performing the operation to reduce the load of the refrigeration cycle even under high load conditions where the inverter temperature is likely to rise. To suppress the transition to a mode that limits performance and maintain a more comfortable control state It is possible to detect the inverter temperature, change the control state based on the temperature threshold value, control the temperature warning mode 102b, and more reliably prevent the inverter 23 from reaching an excessive temperature while improving the comfort. Can be improved.

The second embodiment is an example in which a temperature warning mode is set and controlled based on the inverter internal temperature and the discharge gas pressure.
FIG. 7 is a control block diagram of the controller 1.
In the second embodiment, the switching determination unit 103 inputs the internal temperature of the inverter 23 from the temperature sensor 232 of the inverter 23 and the discharge gas pressure from the pressure sensor 9.

Although the transition from the normal mode 102a to the temperature warning mode 104 is made by comparing the detected temperature with the threshold temperature, in the second embodiment, the temperature threshold value for shifting to the temperature warning mode 104 is further made variable by the discharge gas pressure. Specifically, when the discharge gas pressure (refrigerant pressure) is high, the temperature threshold is lowered, and when the discharge gas pressure (refrigerant pressure) is low, the temperature threshold is raised.
For example, the switching determination unit 103 switches to the temperature warning mode 104 according to the following expression using α as a coefficient.

(Equation 1)
Temperature threshold = 85 ° C. × α (reference discharge gas pressure−discharge gas pressure)

In the temperature warning mode 104, the control is performed so that the rotational speed of the condenser fan 4 becomes higher than the proportional relationship between the discharge gas pressure in the normal mode and the rotational speed of the condenser fan 4.
For example, the rotational speed of the condenser fan 4 (the rotational speed per fixed time) is controlled by the following equation using K1 and K2 as coefficients.

(Equation 2)
Number of revolutions = K1 × discharge gas pressure × K2 (discharge gas pressure / reference discharge gas pressure)
However, when the discharge gas pressure <the reference discharge gas pressure, the discharge gas pressure = the reference discharge gas pressure.
Since other configurations are the same as those of the first embodiment, description thereof is omitted.

The operation will be described.
[Inhibition of function-limited control]
FIG. 8 is an explanatory diagram showing determination contents executed by the switching determination unit 103. FIG. 9 is an explanatory diagram showing the contents of control processing executed in the temperature alert mode 104.

When the control is performed in the normal mode 102a, when the internal temperature of the inverter 23 rises and becomes equal to or higher than the temperature threshold (reference numeral 204 in FIG. 8), the switching determination unit 103 switches to the temperature warning mode 104.
As shown in FIG. 8, the temperature threshold is variably set to a low temperature when the discharge gas pressure is high, and to a high temperature when the discharge gas pressure is low. For example, it is set by Equation 1 above.

  In the temperature warning mode 104, the characteristic indicated by the reference numeral 302 so that the rotational speed is higher than the characteristic indicated by the reference numeral 301 in the normal mode 102a in the relationship between the discharge gas pressure and the rotational speed of the condenser fan 4 shown in FIG. To. For example, it is assumed that the above equation 2 is set.

  The discharge gas pressure is substantially equivalent to the load on the refrigeration cycle in the vehicle air conditioning system. In the second embodiment, since this is determined by the switching determination unit 103, when the load is large, the performance limit mode 102c and the overtemperature mode 102d are entered even when the load is large by shifting to the temperature warning mode 104 as soon as possible. This makes it possible to lengthen the control for maintaining passenger comfort while protecting the inverter 23.

  In addition, when the load is small, the control is performed in the normal mode 102a for a longer time, and the temperature warning mode 104 is minimized so that the control for maintaining the comfort of the passenger can be lengthened.

Explain the effect.
In the vehicle air conditioner of the second embodiment, in addition to the effect of (1) of the first embodiment, the following effects can be obtained.

(3) In the above (1), the temperature sensor 232 for detecting the temperature of the inverter 23 and the pressure sensor 9 for detecting the discharge pressure from the compressor 22 in the refrigeration cycle are provided, and the controller 1 increases the discharge pressure. The warning temperature threshold 204 is variably set so as to become lower according to the control mode, and when the predetermined temperature threshold is exceeded from the control state of the normal mode 102a, the control by the performance limited mode 102c and the overtemperature mode 102d is performed, and the performance limited mode 102c and Since the control by the temperature warning mode 104 is performed by the warning temperature threshold 204 that is lower than the temperature threshold of the overtemperature mode 102d, the warning temperature threshold 204 is changed by the discharge gas pressure equivalent to the load on the refrigeration cycle, When the load is high, the temperature shifts to the temperature warning mode 104 early, and the inverter 23 is surely operated at an excessive temperature. While preventing to become, it is possible to improve comfort.
Since other functions and effects are the same as those of the first embodiment, description thereof is omitted.

The third embodiment is an example in which a temperature warning mode is set and controlled based on the inverter internal temperature, the discharge gas pressure, and the outside air temperature.
FIG. 10 is a control block diagram of the controller 1.
In the second embodiment, the switching determination unit 105 inputs the internal temperature of the inverter 23 from the temperature sensor 232 of the inverter 23, the discharge gas pressure from the pressure sensor 9, and the outside air temperature from the outside air temperature sensor 10.

Although the transition from the normal mode 102a to the temperature warning mode 106 is made by comparing the detected temperature and the threshold temperature, in the third embodiment, the temperature threshold value for shifting to the temperature warning mode 106 is further made variable by the discharge gas pressure and the outside air temperature. Specifically, when the discharge gas pressure (refrigerant pressure) and the outside air temperature are high, the temperature threshold is lowered, and when the discharge gas pressure (refrigerant pressure) and the outside air temperature are low, the temperature threshold is raised.
For example, the switching determination unit 105 switches to the temperature alert mode 106 by the following formula using α and β as coefficients.

(Equation 3)
Temperature threshold = 85 ° C. × α (reference discharge gas pressure−discharge gas pressure) × β (reference outside air temperature−outside air temperature)

In the temperature alert mode 106, control is performed so that the rotational speed of the condenser fan 4 is increased from the proportional relationship between the discharge gas pressure in the normal mode and the rotational speed of the condenser fan 4.
For example, the rotational speed (the rotational speed per fixed time) of the condenser fan 4 is controlled by the following equation using K1, K2, and K3 as coefficients.

(Equation 4)
Rotation speed = K1 × discharge gas pressure × K2 (discharge gas pressure / reference discharge gas pressure) × K3 (outside temperature / reference outside temperature)
However, when the discharge gas pressure <the reference discharge gas pressure, the discharge gas pressure = the reference discharge gas pressure. When the outside air temperature <the reference outside air temperature, the outside air temperature = the reference outside air temperature.
Since other configurations are the same as those of the first embodiment, description thereof is omitted.

The operation will be described.
[Inhibition of function-limited control]
FIG. 11 is an explanatory diagram illustrating determination contents executed by the switching determination unit 105. FIG. 12 is an explanatory diagram showing the contents of control processing executed in the temperature alert mode 106.

When the control is performed in the normal mode 102a, when the internal temperature of the inverter 23 rises and becomes equal to or higher than the temperature threshold (reference numeral 205 in FIG. 11), the switching determination unit 105 switches to the temperature warning mode 106.
As shown in FIG. 11, the temperature threshold is variably set to a low temperature when the discharge gas pressure and the outside air temperature are high, and to a high temperature when the discharge gas pressure and the outside air temperature are low. For example, it is set by Equation 3 above.

  In the temperature alert mode 106, the characteristic indicated by reference numeral 302 is a speed that is higher than the characteristic indicated by reference numeral 301 in the normal mode 102a in the relationship between the discharge gas pressure and the rotational speed of the condenser fan 4 shown in FIG. To. For example, it is assumed that the above equation 4 is set.

  The discharge gas pressure is substantially equivalent to the load on the refrigeration cycle in the vehicle air conditioning system. Also, the outside air temperature is equivalent to the load of the refrigeration cycle. In the third embodiment, since this is determined by the switching determination unit 105, when the load is large, the performance limit mode 102c and the overtemperature mode 102d are entered even when the load is large by shifting to the temperature warning mode 106 earlier. This makes it possible to lengthen the control for maintaining passenger comfort while protecting the inverter 23.

  In addition, when the load is small, the control is performed in the normal mode 102a for a longer time, and the temperature warning mode 106 is minimized so that the control for maintaining the comfort of the passenger can be lengthened.

  In the third embodiment, since the threshold value for shifting to the temperature warning mode 106 is set by the discharge gas pressure and the outside air temperature, the load state of the refrigeration cycle is estimated more accurately, and accordingly the temperature warning mode 106 is appropriately set. As a result, it is possible to more reliably perform the passenger comfort while protecting the inverter 23.

Explain the effect.
In the vehicle air conditioner of the third embodiment, in addition to the effect of (1) of the first embodiment, the following effects can be obtained.
(4) In the above (1), the temperature sensor 232 for detecting the temperature of the inverter 23, the pressure sensor 9 for detecting the discharge pressure from the compressor 22 in the refrigeration cycle, and the outside air temperature sensor for detecting the temperature of the outside air temperature 10, the controller 1 variably sets the warning temperature threshold value 205 so that the discharge pressure and the outside air temperature become lower. When the predetermined temperature threshold value is exceeded from the normal mode 102a, the performance limiting mode 102c and the overtemperature mode are set. Since the control by the temperature warning mode 106 is performed by the warning temperature threshold value 205 of the temperature lower than the temperature threshold values of the performance limiting mode 102c and the over temperature mode 102d, it is equivalent to the load on the refrigeration cycle. The warning temperature threshold 205 is changed so as to respond to the load accurately estimated by the discharge gas pressure and the outside air temperature. Goes ahead temperature alert mode 106 is higher, while preventing that more reliably inverter 23 becomes excessive temperature, it is possible to improve comfort.
Since other functions and effects are the same as those of the first embodiment, description thereof is omitted.

  As mentioned above, although the vehicle air conditioner of this invention has been demonstrated based on Example 1-3, it is not restricted to these Examples about a concrete structure, Each claim of a claim Design changes and additions are permitted without departing from the spirit of the invention.

  For example, in the first to third embodiments, the switching determination unit and the control unit are provided in the controller 1, and each mode is provided in the control unit. However, this configuration is based on the circuit configuration even if configured by a program. May be.

It is a system schematic explanatory drawing of the vehicle air conditioner of Example 1. FIG. 1 is a perspective view of an electric compressor in Embodiment 1. FIG. 1 is a sectional view of an electric compressor in Embodiment 1. FIG. It is a control block diagram of a controller. It is explanatory drawing which shows the content of determination performed by the switching determination part. It is explanatory drawing which shows the control processing content performed in temperature alert mode. It is a control block diagram of a controller. It is explanatory drawing which shows the content of determination performed by the switching determination part. It is explanatory drawing which shows the control processing content performed in temperature alert mode. 3 is a control block diagram of the controller 1. FIG. It is explanatory drawing which shows the content of determination performed by the switching determination part. It is explanatory drawing which shows the control processing content performed in temperature alert mode.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Controller 101 Switching determination part 102 Control part 102a Normal mode 102b Temperature warning mode 102c Performance limited mode 102d Over temperature mode 103 Switching determination part 104 Temperature warning mode 105 Switching warning part 106 Temperature warning mode 2 Electric compressor 21 Electric motor 211 Shaft 212 Rotor 213 Stator 22 Compressor 221 Suction port 222 Discharge port 223 Vane rotor 224 Vane 225 Housing 23 Inverter 231 Circuit board 232 Temperature sensor 3 Capacitor 4 Capacitor fan 5 Liquid tank 6 Expansion valve 7 Evaporator 8 Blower fan 9 Pressure sensor 10 Outside air temperature sensor 11 Inside Air temperature sensor 12 Solar radiation sensor 201, 204, 205 Warning temperature threshold 202, 203 Temperature threshold

Claims (4)

A compressor that compresses the refrigerant of the refrigeration cycle, an electric motor that drives the compressor, and an electric compressor that includes an inverter that drives and controls the electric motor;
Control means for controlling an apparatus constituting a refrigeration cycle including at least the electric compressor, a condenser for performing heat exchange of the refrigerant, and condenser aeration means for ventilating the condenser;
In the vehicle air conditioner, the control means includes a protection control means for restricting the operation of the electric compressor from normal control when the inverter becomes hot and protecting the inverter.
The control means includes
In a normal control state before the control by the protection control means is provided, a warning control means for making the air volume of the condenser ventilation means larger than the normal control state,
An air conditioner for a vehicle. In the vehicle air conditioner according to claim 1,
Inverter temperature detection means for detecting the temperature of the inverter is provided,
The control means performs control by the protection control means when a predetermined temperature threshold value is exceeded from a normal control state, and the warning control means controls the warning temperature threshold value at a temperature lower than the temperature threshold value of the protection control means. To control,
An air conditioner for a vehicle. In the vehicle air conditioner according to claim 1,
Inverter temperature detecting means for detecting the temperature of the inverter;
Pressure detecting means for detecting discharge pressure from the compressor in the refrigeration cycle;
Provided,
The control means includes
The warning temperature threshold is set to be variable so that the discharge pressure decreases as the discharge pressure increases.
When a predetermined temperature threshold is exceeded from a normal control state, control by the protection control means is performed, and control by the warning control means is performed by a warning temperature threshold lower than the temperature threshold of the protection control means. did,
An air conditioner for a vehicle. In the vehicle air conditioner according to claim 1,
Inverter temperature detecting means for detecting the temperature of the inverter;
Pressure detecting means for detecting discharge pressure from the compressor in the refrigeration cycle;
An outside air temperature detecting means for detecting the temperature of the outside air temperature,
Provided,
The control means includes
A warning temperature threshold is set to be variable so as to decrease as the discharge pressure and the outside air temperature increase,
When a predetermined temperature threshold is exceeded from a normal control state, control by the protection control means is performed, and control by the warning control means is performed by a warning temperature threshold lower than the temperature threshold of the protection control means. did,
An air conditioner for a vehicle.

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