JP2001301438A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform temperature control suitable for the feeling of occupants according to each blowing mode when hot water temperature TW is lower than a specified temperature TB. SOLUTION: In the air conditioner for a vehicle, even if each blowing mode is in the same region as a target blowing temperature TAO, an air mix door 31 is controlled so that a B/L mode comes toward the cooler air side than a FOOT mode, and a FACE mode comes toward the more cooler air side than the B/L mode. Practically, in the determination of a target opening SW of the air mix door 31, when the hot water temperature TW is lower than the specified temperature TB, the hot water temperature TW is changed every blowing mode so that correction temperature TWD becomes higher in the order of the FOOT mode, the B/L mode, and the FACE mode. Thereby, even if the TAO is the same, the B/L mode is controlled to the cooler air side than the FOOT mode, and the FACE mode is to the more cooler air side than the B/L mode to provide the air conditioner suitable for the feeling of the occupants.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for a vehicle, and more particularly, to a temperature control of an outlet temperature.

[0002]

2. Description of the Related Art Conventionally, as a vehicle air conditioner, when a hot water temperature TW of a heating heat exchanger is lower than a predetermined temperature TB,
The temperature of the conditioned air is controlled by correcting the actual hot water temperature TW.

Specifically, first, a set temperature TS in a vehicle
Based on the ET, the temperature TR in the vehicle interior, and the like, the required heat amount data (target outlet temperature TAO) to be sent into the vehicle interior is calculated by a predetermined formula. The calculation is performed such that the higher the target outlet temperature TAO, the higher the temperature of the conditioned air.
The blowing mode is determined as shown in FIG. That is, as the target outlet temperature TAO increases, the face mode, the bi-level mode, and the foot mode are provided in this order, and each outlet mode is determined by the open / close position of the outlet switching doors 11 and 12 shown in FIG. Here, in the boundary region of each blowing mode, Ta to Tb and Tc to Tc are set in order to prevent hunting between the blowing modes.
Hysteresis is provided between d. As a result, even if the TAO is the same, different blowing modes exist between Ta and Tb and between Tc and Td.

Next, the target outlet temperature TAO and FIG.
The correction value (the value obtained by converting the hot water temperature TW into the correction temperature TWD) of the heating capacity of the heating heat exchanger 28, the cooling capacity (referred to as TE) in the cooling heat exchanger 22, and heat loss Based on the correction amount (α), the target opening degree S of the air mix door 31 for adjusting the temperature of the conditioned air is calculated by the following equation (1).
W is determined. As the target opening degree SW increases, the temperature of the conditioned air increases.

(Equation 1) SW = [{TAO- (TE + α)} / {TWD- (TE
+ Α)｝] × 100 (%) Here, as shown in FIG. 7, the conversion from the hot water temperature TW to the correction temperature TWD is performed when the hot water temperature TW is sufficiently raised and stabilized, and is higher than the predetermined temperature TB. Temperature TWD is converted to be constant TB. However, if the hot water temperature TW does not rise sufficiently and is lower than the predetermined temperature TB, the hot water temperature TW
Is lower, the correction temperature TWD is also lower.
WD = Hot water temperature TW.
When the hot water temperature TW is equal to or lower than TA, the correction temperature TWD is converted so that TA is constant.

The correction temperature TWD is applied to the case where the blowing mode is the foot mode and the bi-level mode. In the case of the face mode, the correction temperature TWD is converted so that the correction temperature TWD is always constant at TB regardless of the hot water temperature TW. are doing.

Normally, in a bi-level mode for achieving head and foot heat in a vehicle air conditioner, cold air is blown from the face outlet 8 shown in FIG. 1 to the upper body of the occupant, and warm air is blown from the foot outlet 9 to the lower body of the occupant. In order to perform temperature control such as blowing air, control specifications are tuned.

Hereinafter, this tuning will be described with reference to FIG. FIG. 8 shows the relationship between the target opening degree SW and the temperature of the conditioned air blown from the face outlet and the foot outlet. The relationship is that the hot water temperature TW is equal to the predetermined temperature TB (for example, 75
In the case of (degree) or more, the result is as shown by the solid line in FIG. As a premise of the temperature control, the case where the hot water temperature TW is equal to or higher than the predetermined temperature TB is mainly set, and when the target opening degree SW of the air mix door 31 is between SW1 and SW2, the temperature of air blown from the face air outlet (A). Is set to be lower than FACE1 and the condition that the blowing temperature (a) from the foot outlet is higher than FOOT1 is satisfied.

That is, in the bilevel mode, tuning is performed so that the target opening degree SW is limited to SW1 to SW2 so as to satisfy the above conditions. Specifically, the blowing mode is determined according to the target blowing temperature TAO as shown in FIG. 4, and the target opening SW is calculated based on the target blowing temperature TAO. Tuning is performed so that the range (Ta to Td) of the target outlet temperature TAO that can be set to SW1 to SW2 is set to the bilevel mode.

As shown in FIG. 1, the face outlet 8 is arranged on the side of the bypass passage 30 and the foot outlet 9 is arranged on the side of the heater core 28, as shown in FIG. It is in. That is, the cool air in the bypass passage 30 easily flows into the face outlet 8, and the warm air that has passed through the heater core 28 easily flows into the foot outlet 9.

In the foot mode in which the target blowout temperature TAO is higher and the target opening degree SW is larger than in the bilevel mode, the target opening degree SW1 of the bilevel mode is set.
A target opening degree SW is provided so as to partially overlap SW2, and its range is set to SW3 to SW4.

On the other hand, when the hot water temperature TW is lower than the predetermined temperature TB, the temperature control characteristic of the low blowing temperature as shown by the dotted line in FIG. 8 is obtained, and the hot air from the foot blowing port mainly in the foot mode and the bi-level mode. (To ensure that the blow-out temperatures at the target opening SW3 in the foot mode are equal), the correction temperature TWD is set to a smaller value from the conversion diagram shown in FIG.
Is large (in FIG. 8, the warm air side).
That is, even if the target outlet temperature TAO is the same, the target opening SW in the foot mode is set to SW3a to SW3a so that the target opening SW is on the hot air side.
W4, and accordingly, the target opening S in the bi-level mode.
Similarly, W is set to SW1a to SW2a so as to be on the warm air side.

[0013] Thus, when the hot water temperature TW is lower than the predetermined value TB, the hot water temperature TW is reduced to a substantially equivalent correction temperature TW.
D, and is determined to increase the target opening degree SW based on Equation 1, so that it is controlled to the warm air side,
Heating performance can be improved in the foot mode and the bi-level mode.

[0014]

However, in the bi-level mode, the same TWD conversion diagram as that in the foot mode is used, and the target opening SW becomes large as in the foot mode. The outlet temperature (A) from the outlet is also controlled to the hot air side, and the outlet temperature partially exceeds FACE1 (C),
Head and foot fever will be impaired.

In view of the above problems, an object of the present invention is to provide a vehicle air conditioner capable of performing temperature control suitable for an occupant's feeling according to each blowing mode when the hot water temperature TW is lower than a predetermined value. To provide.

[0016]

The present invention employs the following technical means to achieve the above object.

According to the first aspect of the present invention, an air mixing door for adjusting the air temperature by varying the amount of cold air passing through the cooling heat exchanger (22) and the amount of warm air passing through the heating heat exchanger (28). (31) each of the outlet switching doors for determining each of the blowing modes (face mode, bi-level mode, foot mode) with a predetermined hysteresis based on a target blowing temperature (TAO) determined by a predetermined arithmetic expression In the vehicle air conditioner for controlling (11, 12) and the air mix door (31), the control means (6) controls the air temperature in the bi-level mode even if the target outlet temperature (TAO) is in the same region. Is characterized in that the air mix door (31) is controlled to be on the cooler side than in the foot mode and further on the cooler side in the face mode than in the bi-level mode. There.

Thus, the target blowing temperature (TA)
In the bi-level mode and the foot mode in which O) is in the same region, the foot air mode is controlled to the warm air side, and the bi-level mode is controlled to the cold air side from the foot mode. Similarly, in the face mode and the bi-level mode in which the target outlet temperature (TAO) is in the same region, the face mode is controlled further to the cold air side than in the bi-level mode. Air conditioning control suitable for the feeling of the car.

In the invention according to claims 2 and 3, the air mix door (31) is provided with the target outlet temperature (TA).
O) and the temperature (TW) of the heating fluid circulating in the heating heat exchanger (28). As the temperature (TW) of the heating fluid increases, the air-mixing door (31) generates more conditioned air. It is controlled to be on the cold air side,
Even when the target outlet temperature (TAO) is in the same region, the temperature (TW) of the heating fluid is corrected to be higher in the bi-level mode than in the foot mode, and in the face mode than in the bi-level mode. Further, the temperature (TW) of the heating fluid is corrected so as to be higher, and the corrected temperature (TW) of the heating fluid is corrected by the control means (6).
The air mixing door (31) is controlled based on D).

Further, when the temperature (TW) of the heating fluid is lower than a predetermined temperature (TB), the air mixing door (3) is based on the corrected temperature (TWD) of the heating fluid.
It is characterized in that 1) is controlled.

Accordingly, the temperature (T) of the heating fluid in the order of the foot mode, the bi-level mode, and the face mode
W) is corrected to be higher, so that in the bi-level mode and the foot mode in which the target outlet temperature (TAO) is in the same region, the bi-level mode is controlled to be on the cooler side than in the foot mode, and the target outlet temperature (TAO) is controlled. Temperature (TAO)
In the face mode and the bi-level mode in the same area, in the face mode, the temperature is controlled further to the cold air side than in the bi-level mode. In particular, when the temperature (TW) of the heating fluid is lower than a predetermined temperature (TB), The air conditioning control suitable for the occupant's feeling can be effectively performed according to each blowing mode.

Note that the reference numerals in parentheses of the above means indicate the correspondence with the specific means described in the embodiment described later.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention will be described with reference to FIGS. First, the overall configuration of the present embodiment will be described with reference to FIG. The vehicle air conditioner 1 includes an air conditioning case 2 for introducing conditioned air into the vehicle interior, a blower 3 for introducing air into the case 2 and blowing the air into the vehicle interior, a refrigeration cycle 4 constituting cooling means, and a heating means. Hot water circuit 5 and air conditioner control device 6
(See FIG. 2).

The branch cases 2a to 2c are connected to the air downstream side of the air conditioning case 2. Of these, the tip of the branch case 2a is connected to a defroster outlet 7 for blowing air toward the inner surface of the window glass 10 of the vehicle, and the tip of the branch case 2b blows air toward the occupant's upper body. Case 2 connected to the face outlet 8
The tip of c is connected to a foot outlet 9 for blowing air toward the lower body of the occupant. Each outlet 7-9
Is opened and closed by outlet switching doors 11 and 12 provided at the upstream openings of the branch cases 2a to 2c. The outlet switching doors 11 and 12 are connected to a driving means 13 such as a servomotor (FIG. 2) via a link mechanism (not shown).
See).

The blower 3 includes a blower case 3a, a centrifugal fan 3b, and a blower motor 3 as a driving means thereof.
The blower amount is determined according to the applied voltage (blower voltage) to the blower motor 3c.

At the air inlet of the blower case 3a, an inside air inlet 14 for introducing vehicle interior air (hereinafter, inside air) into the air conditioning case 2, and outside vehicle interior (hereinafter, outside air) inside the air conditioning case 2. And an inside / outside air switching box 50 formed with an outside air introduction port 15 for introducing air. Further, the outside air inlet 15 is actually connected to an outside air inlet (not shown) opened to the upper cowl of the vehicle by an outside air introduction duct (not shown). The inside / outside switching box 50 is provided with an inside / outside air switching door 16 driven by a driving means 17 (see FIG. 2) such as a servomotor.
The inside / outside air switching door 16 controls the amount of inside air introduced from the inside air inlet 14 into the air conditioning case 2 and the amount of outside air introduced into the air conditioning case 2 from the outside air inlet 15.

The refrigeration cycle 4 constitutes a cooling heat exchanger (hereinafter, referred to as an evaporator) 22 for cooling the passenger compartment (air) and a dehumidifying means for removing the fogging of the vehicle window glass 10. Yes, specifically, the refrigerant compressor 18, the refrigerant condenser 19, the receiver 20, the pressure reducing device 2
1 and an evaporator 22 and are connected by a refrigerant pipe 24.

The refrigerant compressor 18 is driven by a vehicle engine 26 via an electromagnetic clutch 25 and compresses a gas refrigerant from the evaporator 22 into a high-temperature and high-pressure refrigerant. It is discharged to the container 19 side. The refrigerant condenser 19 receives the ventilation of the cooling fan 27 and condenses and liquefies the high-temperature and high-pressure refrigerant discharged from the refrigerant compressor 18. The receiver 20 separates the refrigerant from the refrigerant condenser 19 into gas and liquid and stores excess refrigerant in the refrigeration cycle 4. The decompression device 21 decompresses and expands the liquid refrigerant from the receiver 20 into a low-temperature and low-pressure refrigerant. Specifically, the decompression device 21 passes through itself so that the degree of superheat of the refrigerant flowing through the outlet pipe of the evaporator 22 becomes constant. And a temperature-operated expansion valve that regulates the flow rate of the refrigerant. The evaporator 22 is arranged in the air conditioning case 2, and the low-temperature low-pressure refrigerant evaporates by air from the blower 3, and the air is cooled by the latent heat of evaporation.

The hot water circuit 5 is disposed downstream of the evaporator 22 in the air-conditioning case 2 and heats the air in the air-conditioning case 2 by circulating a heating fluid as a heat source, that is, engine cooling water. And a hot water pipe 29 connected to the heater core 28.

The heater core 28 is disposed in the case 2 so that the cool air from the evaporator 22 forms a bypass passage 30 that bypasses the heater core 28. The ratio of the amount of air passing through the heater core 28 to the amount of air passing through the bypass passage 30 in the cold air is changed by the position of an air mixing door 31 provided on the upstream side of the heater core 28 in the air. The temperature is adjusted. The air mixing door 31 is connected to a driving unit 32 such as a servo motor via a link mechanism (not shown).
(See FIG. 2).

As shown in FIG.
Are ROM, RA in addition to a microcomputer in which a control program and various arithmetic expressions related to air conditioning control are stored.
It is a well-known device having a built-in M, I / O port, A / D converter, etc. (all not shown).
Each of the servo motors 13, 1, and 2 based on an operation signal output from the
7, 32, a motor drive circuit 34 for driving the blower motor 3c, and a clutch drive circuit 35 for driving the electromagnetic clutch 25.

The above various sensors pass through an internal air temperature sensor 36 for detecting the temperature of the internal air, an external air temperature sensor 37 for detecting the temperature of the external air, a solar radiation sensor 38 for detecting the amount of solar radiation applied to the vehicle interior, and passing through the evaporator 22. A post-evaporator sensor 39 for detecting the temperature of the air immediately after the cooling and a water temperature sensor 40 for detecting the temperature of the engine cooling water flowing through the heater core 28 are used.

The air-conditioner operation panel 33 is provided on an instrument panel (not shown) in the vehicle compartment, and sets a temperature in the vehicle compartment. A switch (not shown) is provided.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG.

When the ignition switch of the vehicle is turned on and power is supplied to the air conditioner control device 6, first, in step S1, various counters and flags are initialized and constants are set. Next, in step S2, the set temperature signal (set temperature TSET) of the temperature setting device 33a is read, and then, in step S3, the values obtained by A / D converting the detection values of the various sensors 36 to 40 (vehicle interior temperature TR) , The outside temperature TAM, the solar radiation temperature TS, the post-evaporator temperature TE, and the hot water temperature TW).
The state of the various switches 3 is read.

Next, in step S4, a target outlet temperature TAO (hereinafter referred to as TAO), which is a target temperature (required heat amount data) of the conditioned air blown into the vehicle interior, is calculated based on the following equation (2).

(Formula 2) TAO = Kset × TSET−Kr × TR−Kam × T
AM−Ks × TS + C Here, Kset, Kr, Kam, and Ks are gains, respectively, and C is a correction constant.

Next, in step S5, the suction mode is determined based on the TAO. For example, the above step S
If the TAO calculated in step 4 is lower than the predetermined value, the inside air introduction port 14 is opened and the outside air introduction port 15 is closed, so that the inside air circulation mode for introducing inside air into the air conditioning case 2 is determined. On the other hand, if the TAO calculated in step S4 is higher than the predetermined value, the inside air introduction port 14 is closed and the outside air introduction port 15 is opened to determine the outside air introduction mode in which outside air is introduced into the air conditioning case 2. Is done.

Next, in step S6, the above-mentioned step S4
The blowing mode is determined based on the TAO calculated as shown in FIG. For example, as the TAO increases, the blowing mode is determined in the order of a face mode (hereinafter, FACE mode), a bi-level mode (hereinafter, B / L mode), and a foot mode (hereinafter, FOOT mode).
Note that the FACE mode is a mode in which conditioned air is blown out from the face outlet 8, and the B / L mode is a mode in which conditioned air is blown out from both the face outlet 8 and the foot outlet 9. The mode is a mode in which the conditioned air is blown out from the foot outlet 9. Each outlet mode is determined by the open / close position of the outlet switching doors 11 and 12.

Next, at step S7, the blower motor 3c
Is determined, and in step S8, the target opening degree SW of the air mix door 31 is set so as to satisfy the equation (1) so that the temperature of the air blown into the vehicle compartment becomes the above TAO.
Is determined based on Here, TWD in Equation 1 is
The detection signal TW of the water temperature sensor 40 (hereinafter referred to as the hot water temperature T
W) is converted (corrected), and the details will be described later.

Next, in step S9, the operation of the refrigerant compressor 18 is determined. In this operation determination, if the temperature detected by the post-evaporator sensor 39 is 3 degrees or less, the refrigerant compressor 18 is stopped so that frost does not occur in the evaporator 22, and
If it is higher than the degree, the refrigerant compressor 18 is operated.

Next, in step S10, each servo motor 13, 17, 3
2. Motor drive circuit 34 and clutch drive circuit 35
To output a control signal. Then, in step S11,
It is determined whether or not a predetermined control cycle τ has elapsed, and if it has elapsed, the process returns to step S2, and if not, the control of step S10 is repeated until the above τ has elapsed.

Hereinafter, step S, which is an essential part of the present invention, will be described.
8 will be described with reference to the flowchart of FIG.

First, in step S8A, the blow mode is determined. That is, the blowing mode determined in step S6 is read, and step S8 is performed according to each blowing mode.
Go to B.

In step S8B, the hot water temperature TW
Is lower than TB, the hot water temperature TW is adjusted to the correction temperature TWD so that the optimum air-conditioning air is obtained for each blowing mode.
Is provided. Specifically, FOO
The conversion pattern in the T mode is that the hot water temperature TW is TB
When the temperature is higher than the temperature TA and when the temperature is lower than the TA, the correction temperature TWD is set to TB constant and TA constant, respectively.
When W is between TA and TB, the correction temperature TWD is converted so as to conform to the hot water temperature TW. The conversion pattern in the B / L mode is such that the hot water temperature TW is higher than the FOOT mode so that the correction temperature TWD becomes higher between TA and TB. That is, the correction temperature TWD is set to reach TB when the hot water temperature TW is lower than TB. Furthermore, the conversion pattern in the FACE mode is
When the hot water temperature TW is between TA and TB, the correction temperature TWD is converted so as to be higher than in the B / L mode. That is, the correction temperature TWD reaches TB when the hot water temperature TW is lower than T2.

Next, in step S8C, the target opening degree SW is determined using the corrected temperature TWD converted for each blowing mode.

With the above configuration and operation, the hot water temperature T
When W is equal to or lower than the predetermined temperature TB, conversion to the correction temperature TWD is performed using a conversion pattern provided for each blowing mode, so that the correction temperature TWD increases in the order of FOOT mode, B / L mode, and FACE mode. Since the correction is made, the blowing mode wraps due to the hysteresis as shown in FIG. 4, and in the B / L mode and the FOOT mode in which TAO is in the same area, the FOOT mode moves to the warm air side and the B / L
The L mode is controlled on the cooler side than the FOOT mode, and in the FACE mode and the B / L mode, the FACE mode is controlled on the cooler side than the B / L mode. That is,
As shown in FIG. 6, in the B / L mode, the target opening degrees SW1b to SW2b are such that the outlet temperature (a) from the foot outlet is FOOT1 or higher and the outlet temperature (a) from the face outlet is FACE1 or lower. Can be tuned, and can satisfy head cold foot fever. Further, in the FOOT mode, the target opening degrees SW3a to SW4 can ensure the same level of warm air as before, and in the FACE mode, the target opening degrees 0 to 3 can be secured.
Sufficient cold air can be obtained with SW0, and air conditioning control suitable for the occupant's feeling can be performed according to each blowing mode.

(Other Embodiments) The correction temperature TWD conversion diagram of the FACE mode in step S8B shown in FIG. 5 shows that the constant water is changed from TA constant to TB as the hot water temperature TW increases.
, And thereafter, the TB is kept constant. However, the TB may be kept constant regardless of the hot water temperature TW.

Since the normal FACE mode requires conditioned air on the cooler side, even when the hot water temperature TW is lower than the predetermined temperature TB, the correction temperature TWD can be set to a high value, for example, constant TB. For example, the target opening degree SW becomes a small value and is controlled to the cold air side from the start. For example, in the summertime or the like, cold air is obtained regardless of the hot water temperature TW, so that comfort for the occupant can be improved.

When the hot water temperature TW is equal to or higher than TB, the correction temperature TWD is set in the FOOT mode, B / L mode, FAC
Although the same TB is used for all E modes, the TB may be set to be higher in the order of the above modes, such as TB, TB1, and TB2. As a result, even when the hot water temperature TW is equal to or higher than the predetermined temperature TB, control of the conditioned air between the blowing modes to the hot air side and the cold air side can be performed, and the comfort for the occupant can be improved.

[Brief description of the drawings]

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

FIG. 2 is a block diagram illustrating a control system of the vehicle air conditioner according to the embodiment of the present invention.

FIG. 3 is a flowchart illustrating air conditioning control contents according to the embodiment of the present invention.

FIG. 4 is a diagram showing a relationship between TAO and a blowing mode in the embodiment of the present invention.

FIG. 5 is a flowchart for determining a target opening degree SW in the embodiment of the present invention.

FIG. 6 is a graph showing a relationship between a target opening degree SW and an outlet temperature from each outlet in the embodiment of the present invention.

FIG. 7 is a conversion diagram for determining a correction temperature TWD in the related art.

FIG. 8 is a graph showing a relationship between a target opening degree SW and a blowout temperature from each blowout port in the related art.

[Explanation of symbols]

 11, 12 Blowing mode switching door 2 Air conditioning case 22 Evaporator (Heat exchanger for cooling) 28 Heater core (Heat exchanger for heating) 30 Bypass flow path 31 Air mix door 6 Air conditioner control device (Control means) 8 Face outlet 9 Foot Outlet

Claims (3)

[Claims] 1. An air conditioning case (2) for guiding blast air, a cooling heat exchanger (22) for cooling air in the air conditioning case (2), and an air downstream of the cooling heat exchanger (22). Provided on the side,
A heating heat exchanger (28) for heating air; a bypass flow path (30) for bypassing the heating heat exchanger (28); an amount of air passing through the heating heat exchanger (28); An air mixing door (31) for adjusting an air temperature according to a ratio of an amount of air passing through the flow path (30); and an air-conditioned wind adjusted by the air mixing door (31) is blown toward an upper body of an occupant in a vehicle cabin. A face outlet (8), a foot outlet (9) that blows out toward the lower body of an occupant in the vehicle compartment, and an outlet switching door (11) that opens and closes the face outlet (8) and the foot outlet (9). , 12)
And calculating at least a target air temperature (TAO) of the conditioned air blown into the vehicle interior based on at least a set temperature (TSET) in the vehicle interior and a temperature (TR) in the vehicle interior, and the target air temperature (TAO) increases. The air mix door (31) adjusts the conditioned air to be on the warm air side, and the face mode in which the conditioned air is blown out from the face outlet (8) as the target outlet temperature (TAO) increases. A bi-level mode in which air-conditioning air is blown out from both the face air outlet (8) and the foot air outlet (9), and a foot mode in which air-conditioned air is blown out from the foot air outlet (9) in this order with a predetermined hysteresis. A mode is determined, and based on the target outlet temperature (TAO), the outlet switching doors (11, 12) and the air mix door (31) are turned on. The air conditioner for a vehicle having a control means (6) for controlling the target air outlet temperature (TAO).
Are in the same area, the air mix door (3) is moved toward the cool air side from the foot mode in the bi-level mode, and further toward the cool air side from the bi-level mode in the face mode.
(1) An air conditioner for a vehicle, wherein (1) is controlled. 2. The air mixing door (31) based on the target outlet temperature (TAO) and the temperature (TW) of a heating fluid circulating in the heating heat exchanger (28). The air mixing door (31) controls the conditioned air to be on the cold air side as the temperature (TW) of the heating fluid is higher, and the target blowing temperature (TAO) is in the same region. In the bi-level mode, the temperature (TW) of the heating fluid is corrected to be higher than that in the foot mode, and the temperature (TW) of the heating fluid is higher in the face mode than in the bi-level mode. The air mixing door (31) is controlled based on the corrected temperature (TWD) of the heated fluid, wherein the control means (6) controls the air mixing door (31). Record -Mounted vehicle air conditioner. 3. The air mixing door based on the corrected heating fluid temperature (TWD) when the temperature (TW) of the heating fluid is lower than a predetermined temperature (TB). The vehicle air conditioner according to claim 2, wherein (31) is controlled.