JP2769073B2 - 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 an air conditioner for a vehicle which performs a so-called warm-up control at the start of a heating operation.

[0002]

2. Description of the Related Art A conventional air conditioner for a vehicle includes a refrigeration cycle and a heater using an engine cooling water as a heat source.
After the air sent from the blower is cooled by the refrigerant evaporator of the refrigeration cycle, it is heated when passing through the heater and blown out into the vehicle interior, thereby heating the vehicle interior.
Therefore, when the temperature of the engine cooling water is low, such as when starting heating, the air passing through the heater is blown to the feet of the occupant without being sufficiently heated, and the occupant's feeling of heating is significantly impaired. It is. Therefore, when the temperature of the engine cooling water is equal to or lower than a predetermined temperature (for example, 70 degrees) at the time of starting heating, the operation of the blower is stopped (or rotated at a low speed), the outlet mode is set to the defroster mode, and the engine cooling water is set. So-called warm-up control for delaying the operation of the refrigerant compressor until the temperature reaches a predetermined temperature is performed.

[0003]

However, after the air conditioner is operated (the refrigerant compressor is operated) and the heating operation is performed while the vehicle is running, the engine is temporarily stopped (parked).
Thereafter, when the engine is started again (at this time, the temperature of the engine cooling water has dropped to a predetermined temperature or lower) and the warm-up control is started, there is a problem that the windshield is fogged. Therefore, the inventor of the present application has studied in detail the problem that the windshield is fogged during the warm-up control. This is described below. When the heating operation is performed while the air conditioner is operating as described above, and then the engine is stopped once, the temperature in the unit housing the heater and the refrigerant evaporator rises due to heat radiation from the heater.
For this reason, the moisture adhering to the refrigerant evaporator evaporates,
The inside of the unit becomes hot and humid. Thereafter, when the vehicle is restarted and the warm-up control is started, the outlet mode becomes the defroster mode, and the blower is stopped. In this state, for example, when running wind is introduced into the unit (normal outside air mode is selected during the heating operation), the outside air temperature is low (0 to 15 ° C.) and the surface temperature of the windshield is low. In this case, high humidity air is blown out from the defroster outlet to the windshield. As a result, it was found that dew condensation occurred on the windshield and the windshield was fogged. The present invention has been made based on the above circumstances, and its purpose is to perform a heating operation while once operating a refrigerant compressor, stop the engine for a while, and then operate the engine again. It is an object of the present invention to provide a vehicle air conditioner that can prevent fogging of a windshield caused by setting a defroster mode when so-called warm-up control is performed.

[0004]

In order to achieve the above object, the present invention has a plurality of air outlets opening at various places in a vehicle interior, including a defroster air outlet opening toward a window glass of a vehicle. Outlet opening / closing means for selectively opening / closing the plurality of outlets in accordance with each outlet mode including a defroster mode for selecting a defroster outlet ;
And blowing means for, and a duct for guiding the blown air to the outlet from the blower means, a cooling means for cooling the air flowing in the duct, the engine cooling water as a heat source, the da
Heating means for heating the air flowing through the interior of the vehicle, water temperature detecting means for detecting the temperature of the engine cooling water, and heating operation.
When started, when the detected value of the water temperature detecting means is equal to or less than a predetermined value, while stopping the operation of the blowing means ,
Open the air outlet so that the defroster mode is set.
First control means for controlling the operation of the closing means;
A second control that activates the stage for a predetermined time from the start of the heating operation
And technical means are provided as technical means.

[0005]

In the air conditioner for a vehicle according to the present invention having the above structure, when the temperature of the engine cooling water is lower than a predetermined value during the heating operation, the defroster mode is set.
The operation of the blowing means is stopped . The cooling means is heating
It operates only for a predetermined time from the start of operation. As a result, even if
If wind travels into the unit, air will flow through the duct
Even when flowing into the room, the air is dehumidified by the cooling means.
From the defroster outlet into the vehicle interior (toward the window glass).
It just blows out. Therefore, the inside of the duct is
When the engine is started and heating operation is started,
Air flows inside the vehicle and the vehicle window
Even if blown toward the lath, the air is
Therefore, since the dehumidification is performed, the window glass can be prevented from fogging. Only
Also limits the operating time of the cooling means to a predetermined time.
Thus, frost of the cooling means can be prevented.

[0006]

Next, an air conditioner for a vehicle according to the present invention will be described with reference to an embodiment shown in FIGS. FIG. 1 is an overall schematic diagram of an air conditioner for a vehicle. An air conditioner 1 for a vehicle (hereinafter referred to as an air conditioner 1) according to the present embodiment includes a duct 2 that guides blast air into a vehicle interior, a blower 3 that introduces air into the duct 2 and sends the air into the vehicle interior. A refrigeration cycle S including the refrigerant evaporator 4 disposed therein, and a heater core 5 disposed downstream (downwind) of the refrigerant evaporator 4 in the duct 2.

The duct 2 is provided with an inside air inlet 6 and an outside air inlet 7 at its upstream end, and each of the inlets 6 and 7 has an inside / outside air switching door 8 that operates according to a selected inside / outside air mode.
Is opened and closed by At the downstream end of the duct 2, there are air outlets opening into the vehicle interior (a defroster air outlet 9 opening toward the windshield in the vehicle interior, a foot air outlet 10 opening at the feet of the occupant, and an opening toward the upper body of the occupant. Branch duct 1 for guiding blast air to face outlet 11)
2, 13, and 14 are connected. Each branch duct 12 ~
In the upstream opening of each outlet 14, each outlet door 1 that opens and closes each branch duct 12 to 14 according to the selected outlet mode.
2a, 13a and 14a are provided. The outlet mode is a face mode in which the cool air is discharged from the face outlet 11 to the upper body and the face of the occupant. The cool air is discharged from the face outlet 11 and the warm air is discharged from the foot outlet 10 to provide comfortable heating of head and foot heat. A bi-level mode is set, a foot mode in which warm air is discharged from the foot outlet 10 to heat the room, and a defroster mode in which conditioned air is discharged from the defroster outlet 9 to remove the windshield.

The blower 3 comprises a centrifugal fan 3a and a fan motor 3b for driving the fan 3a to rotate. The rotational speed is determined according to the voltage applied to the fan motor 3b. The voltage applied to the fan motor 3b is controlled based on an output signal from the microcomputer 16 via the motor drive circuit 15. Refrigeration cycle S
Is a refrigerant compressor 18 driven by the rotational force of the engine 17, a refrigerant condenser 20 that condenses and liquefies the high-temperature and high-pressure refrigerant compressed by the refrigerant compressor 18 by receiving the blowing of the cooling fan 19, 21 for temporarily storing the refrigerant guided from the heater 20 and flowing only the liquid refrigerant, the receiver 21
An expansion valve 22 for decompressing and expanding the introduced refrigerant, and a refrigerant evaporator 4 for evaporating the refrigerant depressurized by the expansion valve 22 by receiving air from the blower 3, and each of the refrigerant pipes 2.
3 are connected in a ring. In addition, the refrigerant compressor 1
Reference numeral 8 includes an electromagnetic clutch 18a that is controlled to be energized by the microcomputer 16 via the compressor drive circuit 24, and the operating state is controlled in accordance with the turning on and off of the electromagnetic clutch 18a. The heater core 5 is connected to a cooling water circuit (not shown) of the engine 17 via a hot water pipe 25, and heats the air passing through the heater core 5 using the engine cooling water heated by cooling the engine 17 as a heat source. I do. The amount of air passing through the heater core 5 is adjusted by the air mix door 26.

The above-described inside / outside air switching door 8 and each outlet door 1
2a to 14a and the air mix door 26 are operated by actuators 27, 28, 29, 30, and 31, respectively, and the actuators 27 to 31 are respectively driven via drive circuits 27a, 28a, 29a, 30a, 31a. , And is controlled based on a control signal from the microcomputer 16. A selection signal selected on the operation panel 32 is input to the microcomputer 16, and each sensor (the internal air temperature sensor 3 for detecting the temperature in the vehicle compartment) is input to the microcomputer 16.
3, an outside air temperature sensor 34 for detecting the temperature outside the vehicle compartment, a solar radiation sensor 35 for detecting the amount of solar radiation inserted into the vehicle interior, an after-evacuation temperature sensor 36 for detecting an outlet-side air temperature of the refrigerant evaporator 4,
A water temperature sensor 37 for detecting the temperature of the engine cooling water, and a potentiometer 3 for detecting the opening of the air mix door 26
8) is input via the input interface 39.

The operation panel 32 is provided on an instrument panel (not shown) in front of the driver's seat. The operation panel 32 has an auto switch 4 as shown in FIG.
0, an off switch 41, a temperature setting switch 42, a set temperature display section 43, an inside / outside air changeover switch 44, an air conditioner switch 45, air volume setting switches 46, 47, 48, and air outlet changeover switches 49, 50, 51, 52 are provided. ing. The auto switch 40 is a switch for outputting a command for automatically controlling each air conditioner constituting the air conditioner 1, and the off switch 41 is a switch for outputting a command for stopping the air conditioner 1. The temperature setting switch 42 is a switch for setting the temperature in the vehicle compartment to a desired temperature, and the set temperature display section 43 is for digitally displaying the set temperature set by the temperature setting switch 42 (in the figure, 25). ° C
Is displayed). The inside / outside air changeover switch 44 is a switch for the occupant to manually set either the outside air mode for specifying outside air introduction or the inside air mode for specifying inside air circulation. When the outside air mode is set, the display 44a is turned on. The indicator 44b is turned on when the mode is set to the inside air mode.

The air conditioner switch 45 is connected to the refrigeration cycle S
, A switch for manually switching between activation and deactivation, that is, an electromagnetic clutch 18 a provided in the refrigerant compressor 18.
This is a switch for manually switching between energizing (ON) and stopping (OFF) energizing. When the electromagnetic clutch 18a is turned on by the air conditioner switch 45, the display 4
When the electromagnetic clutch 18a is turned off, the display 45a is turned off. Air volume setting switches 46-48
Is a switch for changing the air flow level of the blower 3 in a stepwise manner. In this embodiment, the switch can be set to three levels of Hi level (maximum air flow), Me level (intermediate air flow), and Lo level (minimum air flow). Each air volume setting switch 46-48
Are provided with indicators 46a, 47a and 48a, respectively, which light up in accordance with the air volume level of the blower 3 set by the air volume setting switches 46 to 48. The outlet switching switches 49 to 52 are switches for the occupant to manually set the outlet mode. Indicators 49a, 50a,
51a, 52a are provided, and light up in accordance with the outlet mode set by each outlet switch 49-52. In this embodiment, the auto switch 4
If, for example, the inside / outside air changeover switch 44 is pressed after pressing 0, the air conditioners other than the inside / outside air mode are automatically controlled.

Input interface 39 (see FIG. 1)
Converts analog signals from the internal air temperature sensor 33, the external air temperature sensor 34, the solar radiation sensor 35, the after-evacuation temperature sensor 36, the water temperature sensor 37, and the potentiometer 38 into digital signals and outputs the digital signals to the microcomputer 16. The microcomputer 16 includes a ROM 16a, a RAM 16b, a CP
A reference signal for obtaining timing is obtained from a reference signal generator 53 comprising a U16c and using a crystal oscillator. The ROM 16a is a read-only memory, and has a formula for calculating the target blowout temperature TAO, a formula for calculating the target opening degree SW of the air mix door 26, initial data of the inside / outside air mode control characteristics,
Initial data of the outlet mode control characteristics, initial data of the blower control characteristics, initial data of the compressor control characteristics, a predetermined control program, and the like are stored and held. RAM 16b
A memory that can freely read and write data, and is used to hold temporary data that appears during processing. The CPU 16c is a central processing unit that performs various calculations and processes based on a control program stored in the ROM 16a.

Next, the operation of this embodiment will be described based on the processing procedure of the microcomputer 16 when the auto switch 40 is turned on, that is, at the time of automatic control. FIG. 3 is a flowchart showing a processing procedure of the microcomputer 16. First, after setting various data and initial values of flags (step S1), the temperature setting switch 4
2. The set temperature Tset, the inside air temperature Tr, the outside air temperature Tam, the amount of solar radiation Ts, the after-evaporation temperature Te, and the cooling from the inside air temperature sensor 33, the outside air temperature sensor 34, the solar radiation sensor 35, the after-evacuation temperature sensor 36, and the water temperature sensor 37, respectively. Water temperature Tw is input (step S2). Next, the target outlet temperature TAO is calculated from the input data and the following equation 1 stored in the ROM 16a in advance, and the target opening degree SW of the air mix door 26 is calculated from the equation 2 (step S3).

TAO = Kset · Tset−Kr · Tr−Kam · Tam−Ks · Ts + C where Kset: temperature setting constant, Kr: inside air temperature constant, K
am: outside air temperature constant, Ks: solar radiation constant, C: correction constant.

SW = (TAO−Te) × 100 (%) / (Tw−Te) Then, the actuator 3 that drives the air mix door 26 so that the calculated target opening degree SW is obtained.
The control signal is output to the first drive circuit 31a (step S
4).

Next, the outlet mode is selected based on the outlet mode control characteristic (see FIG. 4) indicating the relationship between the target outlet temperature TAO and the outlet mode (step S5). And, to obtain this selected outlet mode,
Control signals are output to drive circuits 28a to 30a of actuators 28 to 30 that drive the outlet doors 12a to 14a. In this outlet mode control characteristic, for example, in summer when the amount of solar radiation is large and the outside air temperature is high, the target outlet temperature TA
By reducing the value of O, the face mode or the bi-level mode is selected. In winter, when the amount of solar radiation is small and the outside air temperature is low, the value of the target outlet temperature TAO is increased, so that the foot mode or the bi-level mode is selected. Is selected. However, the outlet mode control at the start of the heating operation is performed based on the water temperature control characteristics (see FIG. 5) stored in the ROM 16a in advance. In this embodiment, the heating operation is performed when the outlet mode selected based on the target outlet temperature TAO is the foot mode or the bi-level mode (that is, when the value of TAO is high).

Hereinafter, the outlet mode control based on the water temperature control characteristic will be described with reference to the flowchart shown in FIG. An outlet mode is selected based on the outlet mode control characteristics (step S5a), and it is determined whether the selected outlet mode is a foot mode or a bi-level mode (step S5b). When the selected outlet mode is the foot mode or the bi-level mode (Y
In ES), it is determined whether or not the cooling water temperature Tw detected by the water temperature sensor 37 is equal to or higher than a predetermined temperature Tw2 (for example, 70 degrees) (step S5c). In this determination, when the cooling water temperature Tw is equal to or higher than the predetermined temperature Tw2 (YES), each of the outlet doors 1 is set so that the foot mode or the bi-level mode selected based on the outlet mode control characteristics is obtained.
A control signal is output to drive circuits 28a to 30a of actuators 28 to 30 that drive 2a to 14a (step S5d). If it is determined in step S5c that the cooling water temperature Tw is lower than the predetermined temperature Tw2 (NO), the defroster mode is selected regardless of the foot mode or the bi-level mode selected in step S5a, and this defroster mode is obtained. Thus, the control signal is output to each of the drive circuits 28a to 30a (step S5e). Step S5b above
When the selected outlet mode is other than the foot mode or the bi-level mode, a control signal is output to each of the drive circuits 28a to 30a so as to obtain the face mode (step S5f).

Next, the introduction ratio of the inside / outside air is determined based on the inside / outside air control characteristic (see FIG. 7) showing the relationship between the target blowing temperature TAO and the inside / outside air mode. A control signal is output to the drive circuit 27a of the actuator 27 that drives the inside / outside air switching door 8 so that the door 8 can be obtained (step S6). According to the inside / outside air control characteristics,
The outside air mode is selected during the heating operation (that is, when the value of TAO is high).

Next, a blower control characteristic showing the relationship between the target blowout temperature TAO and the air volume level of the blower (see FIG. 8).
Of the fan motor 3b based on the
b), and outputs a control signal to the motor drive circuit 15 so as to obtain the determined rotation speed (step S7). However, when the heating operation is started (when the foot mode or the bi-level mode is selected in step S5), the blower control is performed in advance by R
This is performed based on the water temperature control characteristics (see FIG. 9) stored in the OM 16a. Specifically, the cooling water temperature Tw detected by the water temperature sensor 37 becomes a predetermined temperature Tw1 (for example, 50
° C), the fan motor 3b is turned off. Cooling water temperature T detected by water temperature sensor 37
The voltage applied to the fan motor 3b is gradually increased from the time when w exceeds the predetermined temperature Tw1 until it reaches the predetermined temperature Tw2. That is, after the cooling water temperature Tw exceeds the predetermined temperature Tw1, the air volume level increases with an increase in the cooling water temperature Tw. When the cooling water temperature Tw detected by the water temperature sensor 37 rises to a predetermined temperature Tw2 or more,
The air volume level is controlled based on the blower control characteristics shown in FIG.

Next, on / off of the electromagnetic clutch 18a is determined on the basis of the compressor control characteristics based on the post-evaporation temperature Te (see FIG. 10), and the compressor drive circuit 24 is controlled to obtain the determined state. A signal is output (step S8). However, at the time of starting the heating operation (when the foot mode or the bi-level mode is selected in step S5).
Is performed based on the water temperature control characteristics (see FIG. 11) stored in the ROM 16a in advance. The compressor control based on this water temperature control characteristic will be described with reference to the flowchart shown in FIG. First, it is determined whether or not the auto switch 40 is on (step S8a), and if the auto switch 40 is off (N
O) turns off the electromagnetic clutch 18a (step 8)
g). If the auto switch 40 is on (YES),
Subsequently, it is determined whether or not a command to energize the electromagnetic clutch 18a is output (step S8b), and if not output (NO), the electromagnetic clutch 18a is turned off (step S8g).

When the command to supply power to the electromagnetic clutch 18a is output (YES), the electromagnetic clutch 1 is controlled in accordance with the compressor control characteristics shown in FIG.
8a is turned on or off (step S8).
c) If it is determined to be off, the electromagnetic clutch 18
a is turned off (step S8g). Electromagnetic clutch 18a
If the electromagnetic clutch 18a is turned on or off according to the water temperature control characteristic shown in FIG. 11, it is determined based on the cooling water temperature Tw detected by the water temperature sensor 37 (step S8d). Electromagnetic clutch 18a
Is turned off, a predetermined time T from the start of the heating operation (when the foot mode or the bi-level mode is selected in step S5) using a timer (not shown) built in the microcomputer 16. It is determined whether or not (for example, 60 seconds) has elapsed (step S8e). If the predetermined time T has elapsed (YES), the electromagnetic clutch 18a is turned off (step S8g). If the predetermined time T has not elapsed (NO), the electromagnetic clutch 18
a is turned on (step S8f). Then, step S
Returning to step 2, the above calculation and processing are repeated. Accordingly, when the cooling water temperature Tw detected by the water temperature sensor 37 is equal to or lower than the predetermined temperature Tw2, the electromagnetic clutch 18a is turned on and the refrigerant compressor 18 is driven until a predetermined time (one minute) elapses from the start of the heating operation. Will be.

Here, while the vehicle is running, the air conditioner 1 is operated to perform the heating operation, and then temporarily stopped (the engine 17 is turned off), and the humidity change when the engine 17 is restarted to start the heating operation is shown. As shown in FIG. As shown in FIG. 13, if the engine 17 is once turned off after traveling while the air conditioner 1 is operated, the temperature inside the duct 2 rises due to the heat radiation from the heater core 5, so that the heat adheres to the refrigerant evaporator 4. The evaporating water evaporates, and the inside of the duct 2 becomes high temperature and high humidity. Therefore, the engine 17
After stopping, the humidity gradually increases. Thereafter, when the engine 17 is turned on (restarted) again to start the heating operation,
When the temperature of the engine cooling water is low (70 ° C. or less in this embodiment), the outlet mode becomes the defroster mode. For this reason, in a conventional device that performs so-called warm-up control (the refrigerant compressor is stopped), humid air (indicated by a broken line in FIG. 13) is blown out from the defroster outlet 9 and fogged on the windshield. Occurs. On the other hand, in the present embodiment, when the temperature of the engine cooling water is still low after the start of the engine 17, the defroster mode is selected, and the refrigeration cycle S is operated for a predetermined time T, so that the inside of the duct 2 Is dehumidified, and the dehumidified air (indicated by a solid line in FIG. 13) is blown out from the defroster outlet 9 toward the windshield, whereby the fogging of the windshield can be prevented.

[Modification] In the above embodiment, the heating operation is described when the outlet mode selected in the outlet mode control is the foot mode or the bi-level mode. However, the selected outlet mode is the foot mode. Or when the target outlet temperature TAO is equal to or higher than a predetermined value, the heating operation may be performed. Or, when the heating operation is performed, the outside air temperature and the inside air temperature are both low, the inside air temperature is low, the inside air temperature is lower than the set temperature, and the outside air temperature and the cooling water temperature are both low. May be defined. In the compressor control at the start of the heating operation, the auto switch 40
It is determined whether or not a command to energize the electromagnetic clutch 18a has been output in a state where is turned on (step S8b). For example, an on / off command for the refrigerant compressor 18 cannot be issued by the auto switch 40. In the air conditioner, the on / off state of the air conditioner switch 45 may be determined in step S8b. In this compressor control, if it is determined in step S8d that the electromagnetic clutch 18a is to be turned off, it is determined in step S8e whether a predetermined time T has elapsed since the start of the heating operation by using a timer built in the microcomputer 16 in step S8e. Instead of using a timer, for example, when the cooling water temperature Tw is equal to or lower than a predetermined value, the electromagnetic clutch 18a is energized, and when the cooling water temperature Tw reaches a predetermined value, the energization to the electromagnetic clutch 18a is stopped. May be. In the above embodiment, the post-evaporation temperature sensor 36 is provided at the downstream side of the refrigerant evaporator 4,
The frost prevention of the refrigerant evaporator 4 is performed by performing on / off control of the electromagnetic clutch 18a based on the temperature detected by the post-evaporation temperature sensor 36, but between the refrigerant evaporator 4 and the refrigerant compressor 18. By providing a well-known low-pressure regulating valve so that the low-pressure pressure of the refrigerant evaporator 4 is always maintained at a predetermined value or more, the frost of the refrigerant evaporator 3 can be prevented without providing the post-evaporation temperature sensor 36. You may comprise.

[0022]

According to the air conditioner for a vehicle of the present invention, when the temperature of the engine cooling water is low at the start of the heating operation, the humidity of the blown air blown out from the defroster outlet is reduced by operating the cooling means. Can prevent fogging of the window glass.

[Brief description of the drawings]

FIG. 1 is an overall schematic diagram of a vehicle air conditioner according to an embodiment.

FIG. 2 is a plan view of the operation panel according to the embodiment.

FIG. 3 is a flowchart showing a processing procedure of a microcomputer.

FIG. 4 is a graph showing air outlet mode control characteristics.

FIG. 5 is a graph showing control of an outlet mode at the start of a heating operation.

FIG. 6 is a flowchart showing a processing procedure of the microcomputer relating to the outlet mode control.

FIG. 7 is a graph showing inside / outside air control characteristics.

FIG. 8 is a graph showing blower control characteristics.

FIG. 9 is a graph showing control of a blower at the start of a heating operation.

FIG. 10 is a graph showing compressor control characteristics.

FIG. 11 is a graph showing control of the compressor at the start of the heating operation.

FIG. 12 is a flowchart showing a processing procedure of a microcomputer relating to compressor control.

FIG. 13 is a graph showing a change in defroster outlet humidity corresponding to a running state of a vehicle and an operating state of a refrigerant compressor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Air conditioning apparatus for vehicles 2 Duct 3 Blower (blowing means) 5 Heater core (heating means) 9 Defroster blowout port 10 Foot blowout port 11 Face blowout port 12a, 13a, 14a Blowdown door (opening and closing means) 16 Microcomputer ( First control means, second control means
Control means ) 37 Water temperature sensor (Water temperature detection means) S Refrigeration cycle (Cooling means)

Continuation of the front page (72) Inventor Noriyoshi Miyajima 1-1, Showa-cho, Kariya-shi, Aichi Japan Inside Denso Co., Ltd. (56) References JP-A-3-5226 (JP, A) JP-A-4-15121 ( JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) B60H 1/00 101 B60H 1/00 103

Claims (1)

(57) [Claims] 1. a) a plurality of outlets opening in various places in a vehicle cabin including a defroster outlet opening toward a window glass of a vehicle; and b) each blower including a defroster mode for selecting the defroster outlet. Outlet opening / closing means for selectively opening / closing the plurality of outlets in accordance with an outlet mode; c) blowing means for blowing air into the vehicle interior; d) a duct for guiding blast air from the blowing means to the air outlet. If, e) cooling means for cooling the air flowing in the duct, a f) engine coolant as a heat source, it flows in the duct
A heating means for heating the air that, g) water temperature detecting means for detecting the temperature of the engine coolant
When, h) when the heating operation is started, when the detected value of the coolant temperature detecting means is below a predetermined value, stops the operation of said blower means
And first control means for controlling the operation of the outlet opening / closing means so that the defroster mode is set.
When, i) the cooling means from the heating operation starts for a predetermined time operated
An air conditioner for a vehicle, comprising: a second control unit for causing the control unit to perform the control.