JP3528309B2 - Vehicle air conditioner - Google Patents

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art In a vehicle such as an electric vehicle in which engine exhaust cannot be used as a heat source for heating, heating is performed by a heat pump or an electric heater using a vehicle-mounted battery for traveling as an energy source. For this reason, it is necessary to reduce the power consumption of the battery, and a method of reducing the heating load by reducing the amount of introduced outside air and increasing the ratio of circulation of inside air is adopted. At that time, there is a risk that the humidity in the vehicle compartment becomes high and the window glass becomes cloudy by increasing the rate of circulation of the inside air.

Therefore, conventionally, in order to reduce the heating load while preventing the fogging of the window glass, when the dew condensation sensor detects the dew condensation on the window glass, the intake of the outside air is increased to prevent the dew condensation. When the dew condensation sensor does not detect dew condensation, the humidity sensor detects the relative humidity of the air in the passenger compartment, and the intake ratio of the inside and outside air is adjusted according to the detected relative humidity (Japanese Patent Publication No. 1-27891).

[0004]

However, Japanese Patent Publication No. 1-
When the method of 27891 is used, the problem in practical use of the dew condensation sensor has not been solved, and there is no humidity sensor of a practical level that can accurately measure low humidity (20% RH or less). It was Further, there is a problem that the cost increases due to the use of the humidity sensor. An object of the present invention is to provide an air conditioner for a vehicle, which can always accurately determine the amount of the outside air to be inhaled, which is necessary for defrosting the window glass without using a humidity sensor.

[0005]

DISCLOSURE OF THE INVENTION The present invention includes a duct which is arranged inside a vehicle to form an air passage to a vehicle compartment, a blower which is arranged in the duct and blows air toward the vehicle compartment, and An inside / outside air switching damper installed on the upstream side of the duct to change the inflow ratio of the indoor air and the outdoor air flowing into the duct, and the air arranged in the duct on the downstream side of the blower and sent to the vehicle interior. In contrast to the above, in the vehicle air conditioner including a temperature adjusting means having a heat exchanging portion for radiating and absorbing heat, the blower, the inside / outside air switching damper, and a controlling means for controlling the temperature adjusting means, the control means is An internal air temperature detector that detects an indoor temperature of the vehicle compartment; an outdoor air temperature detector that detects an outdoor air temperature; and an amount of air blown by the blower, and at least the detected indoor temperature and the outdoor air temperature are used for the vehicle. Determine the amount of fresh air needed to defogging the window glass, have a control quantity generation unit that determines the degree of opening of said outside air switching damper from said blast volume and the amount of outside air, the control
The air volume generator prevents the outside air volume from falling below the air flow rate.
Outside air equivalent to the amount of outside air required for fog is always inhaled
As described above, the opening degree of the inside / outside air switching damper is determined and
If the amount of air exceeds the amount of air blown, the amount of air blown
Change the value to be equal to
Determine the opening of the switching damper so that only the outside air is taken in
The vehicle air conditioner characterized by the above is adopted as a technical means.

[0006]

[0007] The present invention provides a vehicle air-conditioning system technical manual stage, the window glass is provided with a heating wire, the outside air quantity required the control quantity generation unit to the anti-fog by the presence or absence of energization of the heating wire The vehicle air conditioner characterized by selecting the method of determining is adopted as the first embodiment. The present invention is the technical means, in the vehicle air conditioner of the first embodiment, the control amount generation unit determines a method of determining the amount of outside air required for the anti-fog depending on whether or not a wiper for the window glass is used. A second vehicle air conditioner characterized by being selected
Is adopted as an embodiment of.

[0008]

In the vehicle air conditioner of the present invention, since the inside air temperature detector and the outside air temperature detector are practically stable and can detect the indoor temperature and the outdoor temperature with high accuracy, the control amount generation unit is You can always accurately and accurately determine the amount of outside air required to prevent windshield fog. In addition, it is necessary to prevent fogging of window glass during heating.
Up to the limit where anti-fog can be performed when the outside air volume is less than the air flow rate
By reducing the amount of outside air and increasing the amount of air inside the air flow
It is possible to reduce the heating load and prevent fog while saving power.
it can. In addition, the outside air required for defrosting the window glass during heating
Even if the amount exceeds the amount of air blown
It is possible to reduce power consumption while suppressing the amount of fog.

[0009]

[0010]

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a vehicle air conditioner of the present invention will be described with reference to FIG.
~ It demonstrates based on the 1st Example shown in FIG. In the present embodiment, the vehicle air conditioner of the present invention is used to save power during heating.

[Apparatus Configuration] The vehicle air conditioner 1 of the present embodiment includes an air conditioning operation unit 2 for supplying conditioned air into the vehicle interior as shown in FIG. 1, and an air conditioner for controlling the operation of the air conditioning operation unit 2. The control device 30 (control means of the present invention). The air conditioning operation unit 2 includes a duct 3 that forms an air passage into the vehicle interior,
It has a blower 4 which is arranged in the duct 3 and introduces air into the passenger compartment. An inside / outside air intake mechanism 5 that allows indoor air and outside air to flow into the duct 3 at an arbitrary ratio is attached to the upstream side of the duct 3.

An outlet switching door (not shown) is provided inside the duct 3 on the downstream side of the air to switch the outlet of the conditioned air. In the duct 3, a refrigerant circulation device 1 that radiates and absorbs heat to the air sent into the passenger compartment by the refrigerant.
0 (temperature adjusting means of the present invention) is connected. Duct 3
A defroster outlet 3a that blows conditioned air toward the window glass of the vehicle, and a face outlet 3b that blows conditioned air toward the upper half of the occupant,
A foot outlet 3c that blows the conditioned air toward the feet of the occupant is formed.

The outlet switching door selectively opens and closes the defroster outlet 3a, face outlet 3b, and foot outlet 3c according to the outlet mode. The inside / outside air intake mechanism 5 includes an inside air intake port 5a and an outside air intake port 5b. An inside / outside air switching damper 6 is provided between the inside air intake port 5a and the outside air intake port 5b so as to be rotatable between a solid line position and a broken line position in FIG. In addition, the inside / outside air switching damper 6 includes
An inside / outside air servomotor 7 for opening / closing the inside / outside air switching damper 6 is connected. And this inside / outside air switching damper 6
1 is in the position indicated by the solid line in FIG. 1, only the outside air is introduced into the duct 3, and in the position indicated by the broken line, only the inside air is sucked into the duct 3.

The refrigerant circulation device 10 comprises a circulation operation section 11 which constitutes an accumulator type refrigeration cycle, and an inverter 21 which controls the electric power from the vehicle running battery B and supplies it to the circulation operation section 11. The circulation operation unit 11 switches the compressor 8, the outdoor heat exchanger 12, the cooling pressure reducer 13, the heating pressure reducer 14, the indoor heat exchanger 15 (the heat exchange unit of the present invention), the accumulator 16, and the refrigerant flow path. The four-way valves 17 are connected by refrigerant pipes.

Further, the circulation operation unit 11 includes a cooling decompressor 1
A bypass passage for heating that bypasses 3 and a bypass passage for cooling that bypasses the heating pressure reducer 14 are provided.
A heating check valve 18 and a cooling check valve 19 are provided in the middle of each of the heating bypass passage and the cooling bypass passage. An outdoor fan 20 for blowing air to the outdoor heat exchanger 12 is arranged near the outdoor heat exchanger 12. The compressor 8 sucks, compresses, and discharges the refrigerant, and has an electric motor 9 for driving built therein. The electric motor 9 is driven by receiving the electric power from the vehicle running battery B, and the rotation speed is determined according to the frequency variably controlled by the inverter 21. Therefore, the refrigerant discharge capacity of the compressor 8 changes according to the rotation speed of the electric motor 9.

The outdoor heat exchanger 12 is a heat exchanger which is disposed outside the duct 3 (outside the vehicle compartment) and receives air from the outdoor fan 20 to exchange heat between the outdoor air and the refrigerant. The outdoor heat exchanger 12 functions as a condenser during a cooling operation described later, and functions as an evaporator during a heating operation described later. The cooling decompressor 13 is the outdoor heat exchanger 1 during the cooling operation.
The refrigerant from 2 is expanded under reduced pressure and is composed of a capillary tube. The heating decompressor 14 decompresses and expands the refrigerant from the outdoor heat exchanger 12 during heating operation, and is composed of a capillary tube.

The indoor heat exchanger 15 is a heat exchanger which is arranged inside the duct 3 and receives air from the blower 4 to exchange heat between the air in the duct 3 and the refrigerant. The indoor heat exchanger 15 functions as an evaporator during cooling operation and as a condenser during heating operation. Accumulator 16
Temporarily stores excess refrigerant in the refrigeration cycle,
Only the gas refrigerant is sent out so that the compressor 8 does not suck the liquid refrigerant. The four-way valve 17 switches the flow of the refrigerant as follows depending on whether the cooling operation or the heating operation is performed.

(Cooling operation) The high-temperature high-pressure refrigerant discharged from the compressor 8 is supplied to the four-way valve 17 → outdoor heat exchanger 12 → check valve 19 for cooling → cooling decompressor 13 → indoor heat exchanger 15 → four-way valve. Flow in the order of 17 → accumulator 16 → compressor 8 (see FIG. 1).
Indicated by arrow C). Thereby, the indoor heat exchanger 15 functions as an evaporator, and the air in the duct 3 is cooled by the indoor heat exchanger 15.

(During heating operation) The high-temperature high-pressure refrigerant discharged from the compressor 8 is supplied to the four-way valve 17 → indoor heat exchanger 15 → heating check valve 18 → heating decompressor 14 → outdoor heat exchanger 12 → four-way valve. Flow in the order of 17 → accumulator 16 → compressor 8 (see FIG. 1).
Indicated by arrow H). Thereby, the indoor heat exchanger 15 functions as a condenser, and the air in the duct 3 is heated by the indoor heat exchanger 15.

Next, the air conditioner control device 30 will be described. As shown in FIG. 2, the air conditioner control device 30 includes an air conditioner operation panel 22 that sets a target value and a condition value, a sensor group G that performs detection necessary for control, an operation signal from the air conditioner operation panel 22, and a sensor group. The device main body 32 is operated by a detection signal from G.

The sensor group G consists of the following. A) Insolation sensor 23 for detecting the amount of solar radiation Ts applied to the vehicle interior b) Indoor temperature sensor 24 for detecting the indoor temperature Tr c) Outside air temperature sensor 25 for detecting the outside air temperature Tam d) On the discharge side of the compressor 8 Pressure sensor 26 for detecting the refrigerant pressure Pc ₁ e) Air temperature Tin on the suction side of the indoor heat exchanger 15
Suction temperature sensor 27 f) Air temperature sensor 28 for detecting air temperature at outlet V) Post evaporating temperature sensor 29 h) Water temperature sensor 31

The main body 32 of the apparatus has a built-in microcomputer 33 which is a controlled variable generating section for outputting a control signal to be sent to a controlled object in response to a detection signal from the sensor group G. The microcomputer 33 is connected to the input unit 34 that receives the detection signal from the sensor group G, an arithmetic processing unit 37 that is connected to the input unit 34 and performs arithmetic processing, and is connected to the arithmetic processing unit 37 and outputs an output signal to a control target. And an output unit 46 for sending. The input unit 34 includes an input interface 35 that is connected to the sensor group G and receives a detection signal, and an input conversion unit 36 that converts a signal from the input interface 35 into input data.

The arithmetic processing section 37 includes a CPU 38 for performing arithmetic operations based on input data, a read-only memory 40 (hereinafter referred to as ROM) for storing programs and data read by the CPU 38 when the CPU 38 is operating, and the CPU 3.
A random access memory 45 (hereinafter referred to as a RAM) used as a calculation area during eight operations is provided. R
The OM 40 stores programs and data necessary for arithmetic processing, and particularly stores the following for use in controlling the rotational speed of the compressor 8 and the opening degree of the inside / outside air switching damper 6.

A. A program for calculating the target outlet temperature Tao of the air blown into the vehicle compartment by the following equation (1). Tao = Kset.Tset-Kr.Tr-Kam.Tam-Ks.Ts + C (1) where Kset, Kr, Kam, and Ks are gains, and C is a correction constant. b. Temperature efficiency φ (v) 3 as a function of the air volume V of the blower 4
Matrix data that gives 9 (see FIG. 3) (2)

C. A program for calculating the saturated refrigerant temperature Tc by the following equation (3). Tc = (Tao−Tin) / φ (v) + Tin (3) where Tin is the air temperature on the suction side of the indoor heat exchanger 15 d. Saturated vapor pressure Pc41 as a function of saturated refrigerant temperature Tc
Matrix data giving (see FIG. 4) (4) e. Blower air flow rate Vao as a function of target outlet temperature Tao
Matrix data (5) giving 42 (see FIG. 5)

F. A program for obtaining the outside air amount Vam required for anti-fog by the following formula (7). Vam = Wm / γam / (Xgi-Xam) (7) where Xam is the outside air absolute humidity when the outside air relative humidity is 100%, γam is the outside air specific weight, Wm is the standard humidification amount for three occupants, and Xgi is Saturated absolute humidity. g. A program for obtaining the inner surface temperature Tgi of the window glass by the following equation (8). Tgi = (αgi · Tr + C ₁ · Tam) / (C ₁ + αgi) (8) where C ₁ = 1 / (δg / λg + 1 / αg ₀ ), αgi
Is the outer surface heat transfer coefficient of the window glass, αg ₀ is the inner surface heat transfer coefficient of the window glass, δg is the plate thickness of the window glass, and λg is the heat transfer coefficient of the window glass.

H. Saturated absolute humidity Xg as a function of Tgi
Matrix data (9) giving i43 (see FIG. 6) i. Matrix data (10) giving the opening ψ44 (see FIG. 7) of the inside / outside air switching damper 6 as a function of the value of Vam / Vao. The output unit 46 is an output conversion unit 4 that converts the control output data output from the CPU 38 into an output signal.
7 and an output interface 48 for transmitting the output signal from the output converter 47 to the controlled object.

The output interface 48 is controlled by the compressor 8, the blower 4, the outdoor fan 20,
The four-way valve 17, the inside / outside air servomotor 7 for driving the inside / outside air switching damper 6, the blowout port servo 50, the air mix servo 51, and other actuators 52 are connected.

[Control Operation] Controlling the Rotational Speed of the Compressor The microcomputer 33 operates in the following manner to control the rotational speed of the compressor 8 so that the temperature of the air blown into the vehicle compartment becomes the target outlet air temperature Tao. (See FIG. 8). 1) The detection signals of the vehicle interior temperature set Tset set by the air conditioner operation panel 22, the room temperature Tr by each sensor, the outside air temperature Tam, and the solar radiation amount Ts are read. 2) The target outlet temperature Tao of the air blown into the vehicle compartment is calculated by the equation (1). 3) The saturated refrigerant temperature Tc is calculated by the equation (3) from the target outlet temperature Tao, the suction temperature Tin, and the value of φ (v) obtained from the matrix data (2).

4) The value of the saturated vapor pressure Pc corresponding to the saturated refrigerant temperature Tc is obtained from the matrix data (4). 5) Since the pressure loss from the compressor 8 to the indoor heat exchanger is small, the saturation pressure Pc can be regarded as substantially equal to the discharge pressure Pc ₁ of the compressor 8 detected by the pressure sensor 26. Therefore, the rotation speed control signal is output to the inverter 21 so that the discharge pressure Pc ₁ of the compressor 8 becomes the saturation pressure Pc, and the rotation speed of the compressor 8 is controlled to target the temperature of the air blown into the vehicle interior. The outlet temperature Tao is set.

Control of opening degree of inside / outside air switching damper (see FIG. 9) The microcomputer 33 operates as follows. 1) The detection signals of the vehicle interior temperature set Tset set by the air conditioner operation panel 22, the room temperature Tr by each sensor, the outside air temperature Tam, and the solar radiation amount Ts are read. 2) The target outlet temperature Tao of the air blown into the vehicle compartment is calculated by the equation (1). 3) The value of the blower air flow rate Vao with respect to the target outlet temperature Tao is obtained from the matrix data (5).

4) The outside air amount Vam required for anti-fog is calculated as follows. In order to prevent the window glass from becoming cloudy, the vehicle interior absolute humidity Xr may be lower than the saturated absolute humidity Xgi with respect to the inner surface temperature Tgi of the window glass. The vehicle interior absolute temperature Xr satisfies the following equation (6). Xr = Xam + Wm / γam / Vam (6) where Xam is the outside air absolute humidity when the outside air relative humidity is 100%, γam is the outside air specific weight, and Wm is the standard humidification amount for three occupants. Therefore, by setting Xr as Xgi, the outside air amount Vam required for anti-fog is obtained by the following equation (7). Vam = Wm / γam / (Xgi-Xam) (7)

Therefore, first, from the specifications of the window glass, the indoor temperature Tr, and the outside air temperature Tam, Tgi is calculated from the equation (8).
To calculate. And saturated absolute humidity Xgi with respect to Tgi
The value of is obtained from the matrix data (9). This Xg
Vam is calculated from i and the values of Wm, γam, and Xam by the equation (7).

5) Calculate φ = Vam / Vao, and control the blown air according to the value of φ. In the case of blower air volume Vao ≧ outside air volume Vam, the value ψ ₀ of the opening ψ of the inside / outside air switching damper 6 with respect to φ is obtained from the matrix data (10), and the inside / outside air switching damper 6 is obtained.
The servomotor 7 is operated so that the opening degree of ψ becomes ₀ . When the blower air flow rate Vao ≤ outside air flow rate Vam, the blower air flow rate is increased until it becomes the same as the outside air flow rate Vam required for anti-fog, and the servo motor 7 is operated to switch the inside / outside air switching damper 6
Is fixed to the position where only the outside air is inhaled.

[Effects of the Embodiment] When the blower air flow rate Vao ≧ outside air amount Vam, the outside air amount is always kept at the minimum outside air amount Vam necessary for anti-fog, so that the proportion of the inside air causes fogging of the window glass. It is the maximum value that does not exist, and power can be saved up to the limit where the window glass does not fog during heating. When the blower air flow rate Vao ≦ outside air flow rate Vam, it is possible to save power by suppressing the air flow rate to the extent that the window glass does not fog. The indoor temperature sensor 2 is used to determine the outside air amount Vam required for anti-fog.
4 and the outside air temperature sensor 25 are used, the cost can be suppressed.

Second Embodiment Next, a vehicle air conditioner of the present invention will be described based on a second embodiment shown in FIGS. 7 and 10 to 12. In this embodiment as well, the vehicle air conditioner of the present invention is used to save power during heating.

[Structure of Device] The vehicle air conditioner of this embodiment has a structure different from that of the first embodiment in the following points. The ROM 40 stores programs and data necessary for arithmetic processing, and particularly stores the following for use in controlling the opening degree of the inside / outside air switching damper 6. i. Matrix data (10) giving the opening ψ44 (see FIG. 7) of the inside / outside air switching damper 6 as a function of the value of Vam / Vao. j. Matrix data (11) (see FIG. 11) that gives the outdoor air amount Vam60 (see FIG. 10) required for anti-fog as a function of the outdoor temperature Tam and the indoor temperature Tr.

K. Matrix data giving the blower terminal voltage as a function of the outside air volume Vam required for anti-fog (1
2).

[Control Operation] Control of Opening of Inside / Outside Air Switching Damper (See FIG. 12) 1) Read outside temperature Tam and inside temperature Tr detected by outside temperature sensor 25 and inside temperature sensor 24, respectively. 2) Obtain the outside air amount Vam required for antifogging from the matrix data (11). 3) The blower terminal voltage for the outside air amount Vam required for this anti-fog is obtained from the matrix data (12), and the blower air amount Vao is calculated from the blower terminal voltage.

4) Calculate φ = Vam / Vao, and control the blowing according to the value of φ. In the case of blower air volume Vao ≧ outside air volume Vam, the value ψ ₀ of the opening ψ of the inside / outside air switching damper 6 with respect to φ is obtained from the matrix data (10), and the inside / outside air switching damper 6 is obtained.
The servomotor 7 is operated so that the opening degree of ψ becomes ₀ . When the blower air flow rate Vao ≤ outside air flow rate Vam, the blower air flow rate is increased until it becomes the same as the outside air flow rate Vam required for anti-fog, and the servo motor 7 is operated to switch the inside / outside air switching damper 6
Is fixed to the position where only the outside air is inhaled.

As an example, both the inside air and the outside air are -8 ° C.
When heating the passenger compartment from the initial state of
Vam from the matrix data (11) for the value -8 ° C
= 300m³/ H is required. And blower air volume Va
o is suppressed to prevent cold wind in the early stage of heating,
100m from the blower terminal voltage according to data (12) ³
If φ / h is obtained, φ ≧ 1, so φ = 1.
So Vao is 300m³/ H. This
As a result, the outside air becomes 100% and the inside air becomes 0%. Indoor temperature
If Tr rises to 22 ° C, the matrix
Outside air volume Vam = 160m from the data (11)³/ H
It At this time φ is Vao = 300 m³/ H to 0.5
It In accordance with this, the outside air volume is adjusted to 50%
The opening ψ is calculated from the Lix data (10) and the servo model
Adjust with the data 7.

[Effects of the Second Embodiment] In the present embodiment, as the data of the matrix data (11), the wind tunnel test may be carried out on an actual vehicle, and the numerical value of the result of the test for ensuring anti-fog may be applied. , It is easier to modify according to the substance than the method of determining the value of φ by the empirical formula. Also, even if the vehicle type changes, φ can be corrected while making corrections as well, which is highly practical.
As in the first embodiment, it is possible to save power to the extent that the window glass does not fog during heating.

[Modifications] The following modifications of the above embodiments are possible. The blower air flow rate Vao may be calculated from the required heat amount Qao by calculating the required heat amount Qao. ON / OFF of electricity to this heating wire by using a heated windshield with built-in heating wire for heating as window glass
The method of determining Vam may be changed by.
The method of determining Vam may be changed depending on whether or not the wiper is used.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a vehicle air conditioner.

FIG. 2 is a diagram showing a configuration of an air conditioner control device.

FIG. 3 Temperature efficiency φ (v) as a function of blower air volume V
FIG.

FIG. 4 Saturated vapor pressure Pc as a function of saturated refrigerant temperature Tc
FIG.

FIG. 5: Blower air volume V as a function of target outlet temperature Tao
It is a figure of ao.

FIG. 6 is the saturated absolute humidity Xg as a function of the inner surface temperature Tgi.
It is a figure of i.

FIG. 7 is a diagram of the opening degree ψ of the inside / outside air switching damper as a function of the value of Vam / Vao.

FIG. 8 is a diagram showing a flow of control of a rotation speed of a compressor.

FIG. 9 is a diagram showing a flow of control of an opening degree of an inside / outside air switching damper.

FIG. 10 is a diagram of an outside air amount Vam required for anti-fog as a function of an outside air temperature Tam and an indoor temperature Tr.

11 is a diagram of matrix data giving Vam of FIG. 10. FIG.

FIG. 12 is a diagram showing a flow of control of an opening degree of an inside / outside air switching damper (second embodiment).

[Explanation of symbols]

1 Air conditioner for vehicle 3 ducts 4 blower 6 Inside / outside air switching damper 15 Indoor heat exchanger (heat exchange part) 10 Refrigerant circulation device (temperature control means) 24 Indoor temperature sensor (inside air temperature detector) 25 Outside temperature sensor (outside temperature detector) 30 Air conditioner control device (control means) 33 microcomputer (control amount generation unit) Tr room temperature Tam outside air temperature Vao blower air flow rate (air flow rate) Vam Outdoor air volume required for anti-fog ψ Opening of inside / outside air switching damper

Continuation of front page (56) Reference JP-A-6-40249 (JP, A) JP-A-5-193341 (JP, A) JP-A-7-1954 (JP, A) JP-A-6-156194 (JP , A) Actual development Sho 63-43811 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B60H 1/00-3/06

Claims (3)

(57) [Claims] 1. A duct that is arranged inside a vehicle to form an air passage to a vehicle compartment, a blower that is arranged in the duct and blows air toward the vehicle compartment, and is attached to an upstream side of the duct. And an outside-air switching damper that changes the inflow ratio of indoor air and outdoor air flowing into the duct, and dissipates and absorbs heat that is arranged in the duct on the downstream side of the blower and is sent to the passenger compartment. In a vehicle air conditioner including a temperature adjusting means having a heat exchange part, the blower, the inside / outside air switching damper, and a controlling means for controlling the temperature adjusting means, the controlling means is an interior temperature of the vehicle compartment. An inside temperature detector for detecting the outside temperature, an outside temperature detector for detecting the outside air temperature, and a blower amount of the blower is determined, and at least the detected indoor temperature and the outside air temperature are used to prevent fogging of the window glass of the vehicle. Determine the main outside air quantity, the have a control quantity generation unit that determines the degree of opening of said outside air switching damper from the air amount and the amount of outside air, the control quantity generation unit, the amount of outside air is fed the Before it is necessary for anti-fog when the air volume falls below
In order to always inhale the outside air corresponding to the outside air volume,
The opening degree of the outside air switching damper is determined, and when the outside air amount exceeds the air blowing amount, the air blowing amount
Change and make it equal to the outside air volume and
Open the inside / outside air switching damper so that only the outside air is taken in.
A vehicle air conditioner characterized by making a decision . 2. The vehicle air conditioner according to claim 1, wherein the window glass is provided with a heating wire, and the controlled variable generation unit is
Depending on the presence / absence of electricity to the heating wire,
A vehicle air conditioner characterized by selecting a determination method . 3. A vehicle air conditioning apparatus according to claims 1 claim 2, wherein the control quantity generation unit whether to use the wiper of the window glass
Select the method for determining the amount of outside air required for anti-fog according to
Air conditioning apparatus for a vehicle, characterized in that.