Vehicle air conditioning system

Abstract

To provide an air conditioner for a vehicle for controlling an environment in a car while taking intension of a user into consideration without excessively increasing a load of the air conditioner in the case of manually selecting an outside air introduction mode.SOLUTION: In an air conditioner for a vehicle including an inside and outside air switching switch for arbitrarily setting an outside air introduction rate for introducing outside air into a car, an outside air temperature detection sensor for detecting outside air temperature, a vehicle information acquisition part for acquiring a vehicle state, and an air-conditioning control unit for calculating an inside air mixture rate for mixing air in the car with the outside air on the basis of a set outside air introduction rate, the detected outside air temperature, and the vehicle state, the air-conditioning control unit calculates an inside air mixture rate on the basis of the set outside air introduction rate, the detected outside air temperature and the vehicle state, and when the inside and outside air switching switch performs setting for performing 100% outside air introduction, the air-conditioning control unit performs control for mixing air inside the car with the introduced outside air on the basis of the calculated inside air mixture rate.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an air conditioner for a vehicle, and more particularly to an air conditioner for a vehicle interior for creating a comfortable environment inside an automobile. [Background technology]

[0002] An automobile is equipped with an air conditioning system for the vehicle. This air conditioning system is controlled by an air conditioning control unit (air conditioner ECU). Also, an inside / outside air selector switch is provided inside the vehicle, which allows the user to set the opening degree of the intake port that introduces outside air into the vehicle. The user can select either automatic mode or manual mode with this inside / outside air selector switch. When the user selects automatic mode, the outside air temperature, inside air (inside the vehicle) temperature, humidity, etc. are automatically measured, and the inside air mixing rate is calculated and automatically controlled by the air conditioning control unit so that the environment inside the vehicle is optimized.

[0003] When the user selects the outside air intake mode in manual mode, 100% of the outside air is usually introduced into the vehicle, which causes an increase in the load on the air conditioner. For example, when the vehicle is being cooled in cooling mode, switching to the outside air intake mode will introduce warm outside air, increasing the load on the air conditioner compressor that circulates the refrigerant, and ultimately causing it to stop, making it impossible to maintain a comfortable environment inside the vehicle.

[0004] Techniques for solving the above-mentioned problems that arise when the outside air introduction mode is selected in the manual mode are disclosed in the following patent documents.

[0005] Patent Document 1 describes that even if the user sets the manual mode switch to the outside air intake mode, if the outside air temperature is low and the heating load is large in the heating operation mode, the mode is changed to the inside / outside air intake mode, both the inside air and the outside air are heated, and the heating operation continues. Also, it describes that even if the user sets the mode to the outside air intake mode, if the outside air temperature is high and the cooling load is large in the cooling operation mode, the mode is changed to the inside / outside air mode, both the inside air and the outside air are cooled, and the cooling operation continues. In other words, it discloses a control that operates in the inside / outside air intake mode corresponding to the air conditioner load even if the mode is set to the outside air intake mode.

[0006] Patent document 2 describes that when the manual outside air mode is being executed and the temperature detected by the outside air sensor is equal to or higher than a predetermined temperature, the inside / outside air switching door is controlled via an electric actuator to introduce approximately half of the inside air and half of the outside air into the vehicle, thereby reducing the load on the compressor that circulates the refrigerant. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent Publication No. 08-020219 [Patent Document 2] Patent Publication No. 2016-002963 Summary of the Invention [Problem to be solved by the invention]

[0008] When the outside air introduction mode is manually selected, in Patent Documents 1 and 2, inside air is also sucked in (introduced) to reduce the load on the air conditioner (compressor, heater, etc.) and prevent an uncomfortable environment. The inside air is sucked in by adjusting the opening of the inside / outside air switching door with an electric actuator. However, until now, when the user manually selected the outside air introduction mode, the inside air intake was controlled only by the outside air temperature, making it difficult to control the mode in a way that respected the user's intentions.

[0009] The present invention has been made in consideration of the above-mentioned problems, and its object is to provide a vehicle air conditioning system that is capable of controlling the in-vehicle environment in a manner that respects the user's intentions when the user manually selects the outside air introduction mode, without excessively increasing the load on the air conditioning system. [Means for solving the problem]

[0010] In order to achieve the above object, the vehicle air conditioner according to claim 1 comprises: An air conditioning device for a vehicle having an inside / outside air changeover switch for allowing a user to arbitrarily set an outside air introduction rate for introducing outside air into a vehicle interior, an outside air temperature detection sensor for detecting an outside air temperature, a vehicle information acquisition unit for acquiring a vehicle state, and an air conditioning control unit for calculating an inside air mixing rate for mixing the introduced outside air with the air inside the vehicle based on the set outside air introduction rate, the detected outside air temperature, and the vehicle state, The vehicle information acquisition unit acquires a refrigerant pressure of an air conditioner, The air conditioning control unit receives the set outside air introduction rate, the detected outside air temperature, and The obtained refrigerant pressure The air conditioning control unit calculates the required inside air mixing rate based on the calculated inside air mixing rate, and even when the inside / outside air selector switch is set to introduce 100% outside air, the air conditioning control unit controls the mixing of the introduced outside air with the air inside the vehicle based on the inside air mixing rate calculated by the air conditioning control unit.

[0013] With this configuration, when the user selects 100% outside air introduction, the air conditioning control unit calculates the necessary inside air mixing ratio taking into account the refrigerant pressure of the air conditioning, so that it is possible to more precisely control the in-vehicle environment without excessively increasing the load on the air conditioning device, especially when it is necessary to cool the inside of the vehicle with refrigerant in summer. In other words, even if the user selects 100% outside air introduction in summer when the outside temperature is high, the inside air mixing ratio is determined to keep the in-vehicle environment comfortable, taking into account the refrigerant pressure of the air conditioning, so that the load on the air conditioning device does not increase excessively.

[0014] Claim 2The vehicle air conditioner according to claim 1 further comprises: The vehicle information acquisition unit acquires an amount of carbon dioxide inside the vehicle, The air conditioning control unit calculates a required inside air mixing rate based on the acquired amount of carbon dioxide, Even if the inside / outside air selector switch is set to introduce 100% outside air, The air conditioning control unit performs control to mix the introduced outside air with the air inside the vehicle based on the inside air mixing rate calculated by the air conditioning control unit.

[0015] With this configuration, when the user selects 100% outside air introduction, the air conditioning control unit calculates the necessary inside air mixing rate taking into account the amount of carbon dioxide inside the vehicle, making it possible to control the in-vehicle environment to be more comfortable. In other words, in an environment where the amount of carbon dioxide inside the vehicle is high, the inside air mixing rate is determined taking into account the amount of carbon dioxide, so the in-vehicle environment can be quickly maintained at a comfortable level.

[0016] Claim 3 The vehicle air conditioner according to claim 1 further comprises: The air conditioning control unit is When the speed of the vehicle acquired by the vehicle information acquisition unit is higher than a set speed, the calculated inside air mixing rate is set lower.

[0017] With this configuration, when the vehicle speed is greater than the set speed and the internal air mixing rate is high, abnormal noises are likely to occur, but by setting the internal air mixing rate lower than the calculated internal air mixing rate, the occurrence of abnormal noises can be suppressed and the in-vehicle environment can be maintained in a more comfortable state.

[0018] Claim 4 The vehicle air conditioning device according to claim 3 In the vehicle air conditioning device according to the present invention, The air conditioning control unit is The vehicle information acquisition unit acquires the set air volume of the air conditioning, and when the speed of the vehicle is greater than the set speed and the set air volume is smaller than the set air volume, the air inside the vehicle is not mixed with the introduced outside air.

[0019] With this configuration, when the vehicle speed is higher than the set speed and the set air volume is lower than the set air volume, more outside air is introduced. In such an environment, the outside air is not mixed with the air inside the vehicle, thereby realizing control that respects the user's intention.

[0020] Claim 5 The vehicle air conditioner according to claim 1 further comprises: an inside / outside air actuator for adjusting the inside air mixing rate to the inside air mixing rate calculated by the air conditioning control unit; The air conditioning control unit is characterized in that it controls the inside / outside air actuator so as to reach the inside air mixing ratio set by the air conditioning control unit in stages.

[0021] With this configuration, the air conditioning control unit controls the inside / outside air actuator in stages to reach the calculated inside air mixing ratio, thereby maintaining a comfortable environment inside the vehicle without the user being alerted to unnecessary noise, such as when the control is suddenly switched. Effect of the Invention

[0022] According to the vehicle air conditioner of the present invention, when the user selects 100% outside air introduction, the inside air mixing rate, which was previously determined only by the outside air temperature, is determined taking into account the vehicle condition as well. Therefore, for example, even if the outside air temperature is the same, a more comfortable in-vehicle environment can be realized because the mixing rate is determined according to the vehicle speed, etc. In other words, since the air conditioner is controlled with the user's intention in mind, the in-vehicle environment is always comfortable, allowing the user to enjoy a more comfortable drive. [Brief description of the drawings]

[0023] [Figure 1] 1 shows a schematic configuration diagram of a vehicle air conditioning system according to the present invention. [Diagram 2] 3 shows operating conditions of the vehicle air conditioner of the present invention. [Diagram 3] Among the operating conditions of the vehicle air conditioner of the present invention, the pressure determination (a) and the outside air determination (b) will be described. [Figure 4] Among the execution conditions of the vehicle air conditioner of the present invention, the following will be described: (a) air volume determination, (b) vehicle speed determination, and (c) in-vehicle CO2 concentration determination. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a vehicle air conditioner according to the present invention will be described in detail with reference to the drawings.

[0025] 1 shows a schematic diagram of a vehicle air conditioner according to the present invention. The vehicle air conditioner 10 includes an air conditioning control unit (air conditioner ECU) 24 that controls the entire system, an inside / outside air selector switch 12 that allows the user to set any outside air introduction rate, an outside air temperature detection sensor 14 that detects the outside air temperature, a speed sensor 16 that detects the vehicle speed, an air volume selector switch 18 that allows the user to set the air volume inside the vehicle, a refrigerant pressure sensor 20 that detects the refrigerant pressure of the air conditioning, a CO2 sensor 22 that detects the amount of carbon dioxide inside the vehicle, and an inside / outside air actuator 26 that adjusts the opening degree of the inside / outside air selector door. These will be described below.

[0026] The inside / outside air changeover switch 12 allows the user to set any outside air introduction rate, and when the outside air introduction rate is set to 100%, the so-called outside air introduction mode is set. The set outside air introduction rate is sent to the air conditioning control unit 24.

[0027] The outside air temperature detection sensor 14 detects the air temperature outside the vehicle, and sends the detection result to the air conditioning control unit 24. The speed sensor 16 detects the vehicle speed, and sends the detection result to the air conditioning control unit 24.

[0028] The air volume changeover switch 18 allows the user to arbitrarily set the air volume inside the vehicle, and the set air volume is sent to the air conditioning control unit 24. The refrigerant pressure sensor 20 detects the air conditioner refrigerant pressure, and the detection result is sent to the air conditioning control unit 24. The CO2 sensor 22 detects the amount of carbon dioxide inside the vehicle, and the detection result is sent to the air conditioning control unit 24.

[0029] The air volume changeover switch 18 can be set manually or automatically using the outside air temperature, the temperature inside the vehicle, the amount of solar radiation, etc. In this embodiment, the air volume can be set manually and automatically.

[0030] The air conditioning control unit 24 has a vehicle information acquisition section (not shown) that acquires the state of the vehicle, and can thereby acquire data transmitted from the inside / outside air selector switch 12, the outside air temperature detection sensor 14, the speed sensor 16, the air volume selector switch 18, the refrigerant pressure sensor 20, and the CO2 sensor 22. Then, based on this data, it calculates the inside air mixing rate required to create an optimal environment inside the vehicle.

[0031] When the inside air mixing rate is calculated, the air conditioning control unit 24 controls the inside / outside air actuator 26 based on the calculated inside air mixing rate. That is, the opening degree of the inside / outside air switching door (not shown) is adjusted by the inside / outside air actuator 26. In this embodiment, for example, it is assumed that when the door is closed, 100% outside air is introduced, and when the door is open, 100% inside air is introduced, and when the door is opened, equal amounts of inside air and outside air are introduced.

[0032] In the vehicle air conditioner of the present invention, when the user selects 100% outside air introduction, the air conditioning control unit previously calculated the required inside air mixing rate based only on the outside air temperature, but now the inside air mixing rate is calculated taking into account the vehicle state, such as the vehicle speed, the air conditioning refrigerant pressure, the amount of carbon dioxide inside the vehicle, the air conditioning blowing air volume, etc. Therefore, control that respects the user's intentions is possible without excessively increasing the load on the air conditioning system. This control ensures that the vehicle interior environment is always kept comfortable.

[0033] FIG. 2 shows the execution conditions of the vehicle air conditioner of the present invention. This is just one example, and it is possible to set more precisely. The execution conditions include pressure, outside temperature, air volume, vehicle speed, and CO2 concentration inside the vehicle. The pressure is the refrigerant pressure of the air conditioner and has two stages, and as shown in FIG. 3(a), when the pressure rises, it is "low" up to P2, and "high" above P2. When the pressure falls, it is "high" up to P1, and "low" below P1, where P1≦P2.

[0034] There are three levels of outside temperature. As shown in Fig. 3(b), when the temperature rises, it is "low" up to T2, "medium" from T2 to T4, and "high" above T4. When the temperature falls, it is "high" up to T3, "medium" from T3 to T1, and "low" below T1. However, if T1≦T2 <T3≦T4である。

[0035] There are three levels of air volume. As shown in Fig. 4(a), when increasing the air volume, the air volume is "small" up to Q2, "medium" from Q2 to Q4, and "large" from Q4 onwards. When decreasing the air volume, the air volume is "large" up to Q3, "medium" from Q3 to Q1, and "small" below Q1. However, when Q1≦Q2 <Q3≦Q4である。

[0036] There are two speed levels, and as shown in Fig. 4(b), when the vehicle speed increases, it is "low" up to speed V2, and "high" above V2. When the speed decreases, it is "high" up to speed V1, and "low" below V1. However, V1≦V2.

[0037] There are three levels of CO2 concentration inside the vehicle. As shown in Figure 4(c), when the concentration is increasing, it is "low" up to M2, "medium" from M2 to M4, and "high" above M4. When the concentration is decreasing, it is "high" up to M3, "medium" from M3 to M1, and "low" below M1. However, if M1≦M2 <M3≦M4である。

[0038] The values ​​judged for pressure, outside temperature, air flow, vehicle speed, and CO2 concentration inside the vehicle differ slightly when the values ​​are rising and falling. This is because hysteresis is provided to prevent hunting in the operation.

[0039] The execution conditions and the inside air mixing control in Fig. 2 will be explained. For example, when the pressure is "low" and the outside temperature is "low", the air conditioning control unit calculates the inside air mixing rate to be "0" regardless of the air volume, vehicle speed, and CO2 concentration inside the vehicle. In this case, the outside air introduction that the user manually set will be executed as is.

[0040] When the pressure is "low," the outside temperature is "medium," and the air volume is "low," the air conditioning control unit calculates the inside air mixing rate to be "0," regardless of the vehicle speed or the CO2 concentration inside the vehicle. In this case, the outside air intake that the user manually set will be executed as is.

[0041] When the pressure is "low", the outside temperature is "medium", and the air volume is "medium", the air conditioning control unit calculates the inside air mixing rate as "low" regardless of the vehicle speed and the CO2 concentration inside the vehicle. In this case, even if the user manually sets the outside air introduction, the inside / outside air actuator is controlled to set the inside air mixing rate to "low". In other words, the opening degree of the inside / outside air switching door is adjusted to allow a small amount of inside air to enter the vehicle.

[0042] When the pressure is "low", the outside temperature is "medium", and the air volume is "large", the air conditioning control unit calculates the inside air mixing ratio as "medium" regardless of the vehicle speed or the CO2 concentration inside the vehicle. In this case, even if the user manually sets the outside air introduction, the inside / outside air actuator is controlled to set the inside air mixing ratio to "medium". In other words, the opening degree of the inside / outside air switching door is adjusted so that about half of the inside air enters the vehicle interior.

[0043] When the pressure is "low," the outside temperature is "high," and the air volume is "low," the air conditioning control unit calculates the inside air mixing rate to be "0," regardless of the vehicle speed or the CO2 concentration inside the vehicle. In this case, the outside air intake that the user manually set will be executed as is.

[0044] When the pressure is "low", the outside temperature is "high", and the air volume is "medium", the air conditioning control unit calculates the inside air mixing rate as "low" regardless of the vehicle speed or the CO2 concentration inside the vehicle. In this case, even if the user manually sets the outside air introduction, the inside / outside air actuator is controlled to set the inside air mixing rate to "low". In other words, the opening degree of the inside / outside air switching door is adjusted to allow a small amount of inside air to enter the vehicle.

[0045] When the pressure is "low", the outside temperature is "high", the air volume is "large", and the vehicle speed is "high", the air conditioning control unit calculates the inside air mixing rate as "medium" regardless of the CO2 concentration inside the vehicle. In this case, even if the user manually sets the outside air introduction, the inside / outside air actuator is controlled to set the inside air mixing rate to "medium". In other words, the opening degree of the inside / outside air switching door is adjusted so that about half of the inside air enters the vehicle.

[0046] When the pressure is "low", the outside temperature is "high", the air volume is "large", the vehicle speed is "low", and the CO2 concentration inside the vehicle is "low to medium", the air conditioning control unit calculates the inside air mixing rate as "high". In this case, even if the user manually sets the outside air introduction, the inside / outside air actuator is controlled to set the inside air mixing rate to "high". In other words, the opening degree of the inside / outside air switching door is adjusted so that most of the inside air enters the vehicle interior.

[0047] When the pressure is "low", the outside temperature is "high", the air volume is "large", the vehicle speed is "low", and the CO2 concentration inside the vehicle is "high", the air conditioning control unit calculates the inside air mixing rate as "medium". In this case, even if the user manually sets the outside air introduction, the inside / outside air actuator is controlled to set the inside air mixing rate to "medium". In other words, the opening degree of the inside / outside air switching door is adjusted so that about half of the inside air enters the vehicle interior.

[0048] When the pressure is "high" and the outside temperature is "medium," the air conditioning control unit calculates the inside air mixing rate to be "0," regardless of the air volume, vehicle speed, or CO2 concentration inside the vehicle. In this case, the outside air intake that the user manually set will be executed as is.

[0049] When the pressure is "high", the outside temperature is "high", and the vehicle speed is "high", the air conditioning control unit calculates the inside air mixing ratio as "medium" regardless of the air volume and the CO2 concentration inside the vehicle. In this case, even if the user manually sets the outside air introduction, the inside / outside air actuator is controlled to set the inside air mixing ratio to "medium". In other words, the opening degree of the inside / outside air switching door is adjusted, and the vehicle is controlled so that about half of the inside air enters the vehicle.

[0050] When the pressure is "high", the outside temperature is "high", the vehicle speed is "low", and the CO2 concentration inside the vehicle is "low to medium", the air conditioning control unit calculates the inside air mixing rate as "high" regardless of the air volume. In this case, even if the user manually sets the outside air introduction, the inside / outside air actuator is controlled to set the inside air mixing rate to "high". In other words, the opening degree of the inside / outside air switching door is adjusted, and control is performed so that most of the inside air enters the vehicle interior.

[0051] When the pressure is "high", the outside temperature is "high", the vehicle speed is "low", and the CO2 concentration inside the vehicle is "high", the air conditioning control unit calculates the inside air mixing ratio as "medium" regardless of the air volume. In this case, even if the user manually sets the outside air introduction, the inside / outside air actuator is controlled to set the inside air mixing ratio to "medium". In other words, the opening degree of the inside / outside air switching door is adjusted, and the vehicle is controlled so that about half of the inside air enters the vehicle.

[0052] Here, the opening degree of the inside / outside air switching door is adjusted according to the inside air mixing rate calculated by the air conditioning control unit as "high," "medium," or "low." Although it has been described that "a little," "about half," or "most" of the inside air enters the vehicle for the inside air mixing rate of "high," "medium," or "low," this is not limited to this and may be expressed numerically.

[0053] In addition to the execution conditions and the inside air mixing control shown in Fig. 2, the air conditioning control unit sets the calculated inside air mixing rate lower when the vehicle speed acquired by the vehicle information acquisition unit is higher than a set speed. As a result, when the vehicle speed is higher than the set speed and the inside air mixing rate is high, abnormal noise is likely to occur, but by setting the inside air mixing rate lower than the calculated inside air mixing rate, the occurrence of abnormal noise can be suppressed and the inside air mixing rate can be maintained in a more comfortable in-vehicle environment.

[0054] In addition, the air conditioning control unit acquires the set air volume of the air conditioning using the vehicle information acquisition unit, and when the vehicle speed is higher than the set speed and the set air volume is lower than the set air volume, the air inside the vehicle is not mixed into the introduced outside air. In other words, when the vehicle speed is higher than the set speed and the set air volume is lower than the set air volume, a large amount of outside air is introduced. In such an environment, by not mixing the air inside the vehicle into the introduced outside air, control that respects the intention of the user can be realized.

[0055] Furthermore, the air conditioning control unit controls the inside / outside air actuator so as to gradually reach the inside air mixing ratio set by the air conditioning control unit. As a result, the air conditioning control unit controls the inside / outside air actuator in stages so as to reach the calculated inside air mixing ratio, so that the user can maintain a comfortable environment inside the vehicle without being made aware of unnecessary noises caused by a sudden change in control.

[0056] According to the vehicle air conditioner of this embodiment, when the user selects 100% outside air introduction, the air conditioning control unit previously calculated the necessary inside air mixing ratio based only on the outside air temperature, but now the vehicle conditions, such as the vehicle speed, the air volume inside the vehicle set by the user, the air conditioner refrigerant pressure, and the CO2 concentration inside the vehicle, are also taken into consideration, making it possible to perform control that respects the user's intentions more. Therefore, the user can enjoy driving more comfortably without excessively increasing the load on the air conditioner.

[0057] The present invention is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the present invention. For example, the pressure and other parameters are determined in three stages, "high", "medium", and "low", or in two stages, but may be set more finely. The inside air mixing rate is set to "0", "low", "medium", and "high", but may be set by a numerical value. [Explanation of symbols]

[0058] 10. Air conditioning system for vehicles 12 Inside / Outside Air Change Switch 14 Outside air temperature detection sensor 16 Speed ​​Sensor 18 Airflow switch 20 Refrigerant pressure sensor 22 CO2 sensor 24 Air Conditioner ECU (Air Conditioning Control Unit) 26 Inside / Outside Air Actuator

Claims

1. An inside / outside air selector switch that allows a user to arbitrarily set the ratio of outside air introduced into the vehicle; an outside air temperature detection sensor that detects an outside air temperature; and a vehicle information acquisition unit that acquires a state of the vehicle; an air conditioning control unit that calculates an inside air mixing ratio for mixing the introduced outside air with the air inside the vehicle based on the set outside air introduction ratio, the detected outside air temperature, and a state of the vehicle, The vehicle information acquisition unit acquires a refrigerant pressure of an air conditioner, The air conditioning control unit calculates a required inside air mixing rate based on the set outside air introduction rate, the detected outside air temperature, and the acquired refrigerant pressure, Even if the inside / outside air changeover switch is set to introduce 100% outside air, The air conditioning control unit performs control so that the introduced outside air is mixed with the air inside the vehicle based on the inside air mixing rate calculated by the air conditioning control unit.

2. The vehicle information acquisition unit acquires an amount of carbon dioxide inside the vehicle, The air conditioning control unit calculates a required inside air mixing rate based on the acquired amount of carbon dioxide, Even if the inside / outside air changeover switch is set to introduce 100% outside air, 2. The vehicle air conditioner according to claim 1, wherein the air conditioning control unit performs control to mix the air inside the vehicle with the introduced outside air based on the inside air mixing rate calculated by the air conditioning control unit.

3. The air conditioning control unit is 2. The vehicle air conditioner according to claim 1, wherein the calculated inside air mixing rate is set lower when the vehicle speed acquired by the vehicle information acquisition unit is higher than a set speed.

4. The air conditioning control unit is 4. The vehicle air conditioning system according to claim 3, characterized in that the vehicle information acquisition unit acquires a set air volume for the air conditioning, and when the speed of the vehicle is greater than the set speed and the set air volume is smaller than the set air volume, the introduced outside air is not mixed with the air inside the vehicle.

5. an inside / outside air actuator for adjusting the inside air mixing rate to the inside air mixing rate calculated by the air conditioning control unit; 2. The vehicle air conditioner according to claim 1, wherein the air conditioning control unit controls the inside / outside air actuator so as to reach the inside air mixing ratio set by the air conditioning control unit in stages.

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