JPH06135218A - Air conditioner for vehicle - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the fogging of the window glass that occurs when the defroster mode is set when the temperature of the engine cooling water supplied to the heater is low. [Configuration] When the temperature of the engine cooling water is equal to or lower than a predetermined temperature Tw2 (for example, 70 ° C.) at the time of starting the heating operation (when the foot mode or the bilevel mode is selected), the defroster mode is set and the heating is performed. The electromagnetic clutch 18a is turned on and the refrigerant compressor 18 is driven until a predetermined time (for example, 60 seconds) has elapsed from the start of the operation. Further, in the blower 3, the temperature of the engine cooling water is the predetermined temperature Tw1.
When the temperature is below (for example, 50 ° C), the temperature is stopped and the predetermined temperature Tw1
The voltage applied to the fan motor 3b is gradually increased as the temperature of the cooling water rises after the temperature exceeds Tw2 until the temperature reaches the predetermined temperature Tw2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner which performs so-called warm-up control at the start of heating operation.

[0002]

2. Description of the Related Art A conventional vehicle air conditioner includes a refrigeration cycle and a heater using 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 the heating is started, the air passing through the heater is not sufficiently heated and is blown to the feet of the occupant, which significantly impairs the heating feeling of the occupant. Be done. Therefore, when the temperature of the engine cooling water is equal to or lower than a predetermined temperature (for example, 70 degrees) when the heating is started, the blower operation 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 is performed in which the operation of the refrigerant compressor is delayed until the temperature reaches a predetermined temperature.

[0003]

However, after the air conditioner is operated (the refrigerant compressor is operated) and the heating operation is performed while the vehicle is traveling, the engine is temporarily stopped (parked),
After that, when the engine is restarted (the temperature of the engine cooling water has dropped to a predetermined temperature or lower at this time) and the warm-up control is started, there is a problem that the windshield becomes cloudy. Therefore, the inventor of the present application examined in detail the problem that the windshield becomes cloudy during warm-up control. This will be 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 inside the unit that houses the heater and the refrigerant evaporator rises due to heat radiation from the heater.
Therefore, the water adhering to the refrigerant evaporator evaporates,
The unit becomes hot and humid. After that, 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 traveling wind is introduced into the unit (normal outside air mode is selected during 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 to the windshield from the defroster outlet. As a result, it was found that dew condensation occurs on the windshield and the windshield becomes cloudy. The present invention has been made based on the above circumstances, and an object thereof is to perform a heating operation while operating a refrigerant compressor, stop the engine for a while, and then restart the engine. An object of the present invention is to provide a vehicle air conditioner capable of preventing the windshield from being fogged when the defroster mode is set when so-called warm-up control is performed.

[0004]

In order to achieve the above-mentioned object, the present invention provides a plurality of air outlets which are opened at various places in a vehicle compartment, including a defroster air outlet which is opened toward a window glass of a vehicle. A blower opening / closing means for selectively opening / closing the plurality of blower outlets according to each blower outlet mode including a defroster mode for selecting a defroster blower outlet, and blowing air to the blower outlet opened by the blower outlet opening / closing means. A duct that guides the air, a blowing unit that blows air into the vehicle compartment through the duct, and a cooling unit that cools the air flowing in the duct.
The engine cooling water is provided with heating means for heating passing air as a heat source, and water temperature detecting means for detecting the temperature of the engine cooling water. When the heating operation is performed, the detected value of the water temperature detecting means is equal to or less than a predetermined value. At times, the air blowing amount of the air blowing unit is controlled to be equal to or less than a predetermined air amount, the air outlet opening / closing unit is controlled to set the defroster mode, and the cooling unit is operated to operate the cooling unit. The technical means that the control means for controlling is provided.

[0005]

In the vehicle air conditioner of the present invention having the above structure, the defroster mode is set when the temperature of the engine cooling water is equal to or lower than the predetermined value during the heating operation.
The amount of air blown by the air blower is controlled to be equal to or less than a predetermined amount. As a result, the air that has not been sufficiently heated by the heating means is blown into the vehicle compartment from the defroster outlet.
Further, when the temperature of the engine cooling water is equal to or lower than the predetermined value, the cooling means is operated so that the air flowing in the duct is cooled (dehumidified) by the cooling means. So, for example,
Even when the heating operation is started, the heating operation is performed while the cooling means is being operated while the vehicle is running, and then the engine is stopped and the vehicle is restarted when the temperature of the engine cooling water drops below a predetermined value. The defroster mode is set and the cooling means is operated. As a result, after the engine is stopped, the air in the duct, which is in a high temperature and high humidity state due to the heat radiation from the heating means, is dehumidified by the operation of the cooling means, so the dehumidified air is discharged from the defroster outlet to the vehicle. It will be blown out toward the window glass of.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a vehicle air conditioner of the present invention will be described based on an embodiment shown in FIGS. FIG. 1 is an overall schematic view of a vehicle air conditioner. A vehicle air conditioner 1 (hereinafter, referred to as an air conditioner 1) of the present embodiment includes a duct 2 that guides blown air into the passenger compartment, a blower 3 that introduces air into the duct 2 and sends the air into the passenger compartment, and the duct 2. The refrigeration cycle S including the arranged refrigerant evaporator 4 and the heater core 5 arranged in the duct 2 downstream (downwind) of the refrigerant evaporator 4 are provided.

The duct 2 is provided with an inside air inlet 6 and an outside air inlet 7 at its upstream end, and each inlet 6, 7 operates an inside / outside air switching door 8 which operates according to the selected inside / outside air mode.
It is opened and closed by. At the downstream end of the duct 2, each outlet opening into the passenger compartment (a defroster outlet 9 opening toward the windshield inside the passenger compartment, a foot outlet 10 opening at the foot of the passenger, an opening toward the upper body of the passenger) Branch duct 1 for introducing blast air to the face outlet 11)
2, 13, 14 are connected. Each branch duct 12 ~
Each of the outlet doors 1 that opens and closes each of the branch ducts 12 to 14 according to the selected outlet mode is provided in the upstream opening of the outlet door 14.
2a, 13a, 14a are provided. The outlet mode is a face mode in which cool air is discharged from the face outlet 11 to the occupant's upper body and face, and cool air is discharged from the face outlet 11 and warm air is discharged from the foot outlet 10 to provide comfortable heating of head cold feet. There are a bi-level mode for performing, a foot mode for ejecting warm air from the foot outlet 10 to heat the room, and a defroster mode for ejecting conditioned air from the defroster outlet 9 to remove the windshield.

The blower 3 comprises a centrifugal fan 3a and a fan motor 3b for rotationally driving the fan 3a, and the rotation 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 the output signal from the microcomputer 16 via the motor drive circuit 15. Refrigeration cycle S
Is a refrigerant compressor 18 that is 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 air from a cooling fan 19, and a refrigerant condenser. Receiver 21 for temporarily storing the refrigerant introduced from the container 20 and flowing only the liquid refrigerant, the receiver 21
It is composed of an expansion valve 22 for decompressing and expanding the introduced refrigerant, and a refrigerant evaporator 4 for evaporating the refrigerant decompressed by the expansion valve 22 by receiving air from the blower 3, and the refrigerant pipes 2 respectively.
They are connected in an annular shape by 3. The refrigerant compressor 1
Reference numeral 8 includes an electromagnetic clutch 18a whose energization is controlled by the microcomputer 16 via the compressor drive circuit 24, and the operating state is controlled by turning on / off 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 by using the engine cooling water heated by cooling the engine 17 as a heat source. To do. The amount of air passing through the heater core 5 is adjusted by the air mix door 26.

The above-mentioned inside / outside air switching door 8 and each outlet door 1
2a to 14a and the air mix door 26 are operated by respective actuators 27, 28, 29, 30 and 31, respectively, and the respective actuators 27 to 31 respectively via respective drive circuits 27a, 28a, 29a, 30a and 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 (inside air temperature sensor 3 for detecting the temperature in the vehicle interior)
3, an outside air temperature sensor 34 that detects the temperature outside the vehicle compartment, a solar radiation sensor 35 that detects the amount of solar radiation that is inserted into the vehicle compartment, an after-evaporator temperature sensor 36 that detects the outlet side air temperature of the refrigerant evaporator 4,
A water temperature sensor 37 for detecting the temperature of engine cooling water, and a potentiometer 3 for detecting the opening degree of the air mix door 26.
The detection signal from 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. On the operation panel 32, as shown in FIG.
0, an off switch 41, a temperature setting switch 42, a set temperature display unit 43, an inside / outside air switching switch 44, an air conditioner switch 45, air volume setting switches 46, 47, 48 and outlet switching switches 49, 50, 51, 52 are provided. ing. The auto switch 40 is a switch that outputs a command to automatically control each air conditioner that constitutes the air conditioner 1, and the off switch 41 is a switch that outputs a stop command to the air conditioner 1. The temperature setting switch 42 is a switch for setting the temperature inside the vehicle compartment to a desired temperature, and the set temperature display section 43 digitally displays the set temperature set by the temperature setting switch 42 (25 in the figure). ℃
Is displayed). The inside / outside air changeover switch 44 is a switch for the occupant to manually set either the outside air mode that specifies the outside air introduction or the inside air mode that specifies the inside air circulation. When the outside air mode is set, the indicator 44a The indicator 44b is turned on when the inside air mode is set.

The air conditioner switch 45 is used for the refrigeration cycle S.
Switch for manually switching between operation and stop, that is, an electromagnetic clutch 18a provided in the refrigerant compressor 18.
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
5a is turned on and the indicator 45a is turned off when the electromagnetic clutch 18a is turned off. Air volume setting switch 46-48
Is a switch that switches the air flow level of the blower 3 in stages, and in this embodiment, 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, 48a, respectively, and the indicators are turned on in accordance with the air volume levels of the blower 3 set by the air volume setting switches 46 to 48. The outlet changeover switches 49 to 52 are switches for the passenger to manually set the outlet mode. Each of the outlet switching switches 49 to 52 has an indicator 49a, 50a,
51a and 52a are provided, and light up according to the outlet mode set by each outlet changeover switch 49-52. In this embodiment, the auto switch 4
After pressing 0, for example, when the inside / outside air changeover switch 44 is pressed, the air conditioners other than the inside / outside air mode are automatically controlled.

Input interface 39 (see FIG. 1)
Converts an analog signal from the inside air temperature sensor 33, the outside air temperature sensor 34, the solar radiation sensor 35, the after-evaporation temperature sensor 36, the water temperature sensor 37, and the potentiometer 38 into a digital signal and outputs the digital signal to the microcomputer 16. The microcomputer 16 includes a ROM 16a, a RAM 16b, a CP
A reference signal for timing is obtained from a reference signal generator 53 which is composed of U16c and uses a crystal oscillator. The ROM 16a is a read-only memory, which is an arithmetic expression of the target outlet temperature TAO, an arithmetic expression of the target opening SW of the air mix door 26, initial data of the inside / outside air mode control characteristics,
The initial data of the outlet mode control characteristics, the initial data of the blower control characteristics, the initial data of the compressor control characteristics, a predetermined control program, etc. are stored and held. RAM16b is
It is a memory that can freely read and write data, and is used to temporarily hold data that appears during processing. The CPU 16c is a central processing unit that performs various calculations and processes based on the 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 auto control. FIG. 3 is a flowchart showing the processing procedure of the microcomputer 16. First, after setting initial values of various data and flags (step S1), the temperature setting switch 4
2. From the inside air temperature sensor 33, the outside air temperature sensor 34, the solar radiation sensor 35, the after-evaporation temperature sensor 36, and the water temperature sensor 37, 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, respectively. The water temperature Tw is input (step S2). Next, the target blow-out temperature TAO is calculated from each input data and the following mathematical formula 1 stored in the ROM 16a in advance, and the target opening degree SW of the air mix door 26 is calculated from the mathematical formula 2 (step S3).

## EQU1 ## TAO = Kset.Tset-Kr.Tr-Kam.Tam-Ks.Ts + C where Kset is a temperature setting constant, Kr is an inside air temperature constant, K
am: outside air temperature constant, Ks: solar radiation constant, C: correction constant.

## EQU00002 ## SW = (TAO-Te) .times.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 driving circuit 31a (step S
4).

Next, the air outlet mode is selected based on the air outlet mode control characteristic (see FIG. 4) showing the relationship between the target air outlet temperature TAO and the air outlet mode (step S5). Then, in order to obtain this selected outlet mode,
A control signal is output to the drive circuits 28a-30a of the actuators 28-30 that drive the outlet doors 12a-14a. With this outlet mode control characteristic, for example, in the summer when the amount of solar radiation is high and the outside air temperature is high, the target outlet temperature TA
When the O value becomes smaller, the face mode or the bi-level mode is selected. In the winter when the amount of solar radiation is small and the outside air temperature is low, the target outlet temperature TAO becomes large, 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 characteristic (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 bilevel mode (that is, when the TAO value is high).

The outlet mode control based on the water temperature control characteristic will be described below with reference to the flow chart shown in FIG. The outlet mode is selected based on the outlet mode control characteristic (step S5a), and it is determined whether the selected outlet mode is the foot mode or the bi-level mode (step S5b). When the selected outlet mode is foot mode or bilevel mode (Y
ES) determines 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 outlet door 1 is selected so that the foot mode or bilevel mode selected based on the outlet mode control characteristics can be obtained.
The control signals are output to the drive circuits 28a to 30a of the actuators 28 to 30 that drive the actuators 2a to 14a (step S5d). When 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, the control signal is output to each of the drive circuits 28a to 30a so that the face mode is obtained (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 outlet air 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 as to be obtained (step S6). According to this inside / outside air control characteristic,
The outside air mode is selected during the heating operation (that is, when the TAO value is high).

Next, a blower control characteristic showing the relationship between the target outlet temperature TAO and the air flow level of the blower (see FIG. 8).
Based on the rotation speed of the fan motor 3b (the fan motor 3
The voltage applied to b) is determined, and a control signal is output to the motor drive circuit 15 so that the determined rotation speed is obtained (step S7). However, when the heating operation is started (when the foot mode or the bi-level mode is selected in step S5 above), the blower control is performed in advance by R
This is performed based on the water temperature control characteristic (see FIG. 9) stored in the OM 16a. Specifically, the cooling water temperature Tw detected by the water temperature sensor 37 is the predetermined temperature Tw1 (for example, 50
When the temperature falls below (° C.), the fan motor 3b is turned off. Cooling water temperature T detected by the 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 to the time when the temperature reaches the predetermined temperature Tw2. That is, after the cooling water temperature Tw exceeds the predetermined temperature Tw1, the air volume level increases as the cooling water temperature Tw rises. When the cooling water temperature Tw detected by the water temperature sensor 37 rises above the predetermined temperature Tw2,
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 based on the compressor control characteristic (see FIG. 10) by the post-evaporation temperature Te, and the compressor drive circuit 24 is controlled so that the determined state is obtained. A signal is output (step S8). However, at the start of heating operation (when the foot mode or bilevel mode is selected in step S5)
The compressor control in is performed based on the water temperature control characteristic (see FIG. 11) stored in the ROM 16a in advance. The compressor control based on this water temperature control characteristic will be described based on 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 energization command to the electromagnetic clutch 18a is output (YES), the electromagnetic clutch 1 is operated based on the post-evaporation temperature Te according to the compressor control characteristic shown in FIG.
8a is determined to be turned on or off (step S8
c), if it is determined to turn off, the electromagnetic clutch 18
a is turned off (step S8g). Electromagnetic clutch 18a
If it is determined to turn on, it is determined based on the cooling water temperature Tw detected by the water temperature sensor 37 whether to turn on or off the electromagnetic clutch 18a according to the water temperature control characteristic shown in FIG. 11 (step S8d). Electromagnetic clutch 18a
If it is determined to turn off, the timer 16 (not shown) incorporated in the microcomputer 16 is used for 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). It is determined whether (for example, 60 seconds) has passed (step S8e), and when the predetermined time T has passed (YES), the electromagnetic clutch 18a is turned off (step S8g). When the predetermined time T has not elapsed (NO), the electromagnetic clutch 18
a is turned on (step S8f). After that, step S
Returning to step 2, the above calculation and processing are repeated. Thereby, 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 (1 minute) elapses from the start of the heating operation. Will be.

Here, while the vehicle is traveling, the air conditioner 1 is operated to perform the heating operation, then temporarily stopped (the engine 17 is turned off), and the engine 17 is restarted to change the humidity when the heating operation is started. It shows in FIG. As shown in FIG. 13, when the engine 17 is once turned off after traveling while the air conditioner 1 is operating, the temperature inside the duct 2 rises due to the heat radiation from the heater core 5, so that the refrigerant adheres to the refrigerant evaporator 4. The moisture that is being evaporated evaporates, and the inside of the duct 2 becomes hot and humid. Therefore, the engine 17
After the stop, the humidity gradually increases. After that, 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. Therefore, in a conventional device that performs so-called warm-up control (the refrigerant compressor is stopped), high-humidity air (shown by a broken line in FIG. 13) is blown out from the defroster blow-out port 9 so that the windshield becomes cloudy. Occurs. On the other hand, in the present embodiment, after the engine 17 is started, when the temperature of the engine cooling water is still low, the defroster mode is selected and the refrigeration cycle S is operated for the predetermined time T, so that the inside of the duct 2 is reduced. Is dehumidified and the dehumidified air (shown by the solid line in FIG. 13) is blown from the defroster outlet 9 toward the windshield, whereby the windshield can be prevented from fogging.

[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. The heating operation may be performed when or when the target outlet temperature TAO is equal to or higher than a predetermined value. Alternatively, the conditions for heating operation are that 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 heating operation, the auto switch 40
Although it is determined whether or not the command to energize the electromagnetic clutch 18a is output in the state where is turned on (step S8b), for example, the on / off command of 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, when it is determined in step S8d that the electromagnetic clutch 18a is turned off, it is determined in step S8e whether or not a predetermined time T has elapsed since the heating operation was started using the timer built in the microcomputer 16. However, instead of using the 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 the predetermined value, the electromagnetic clutch 18a is deenergized. May be. In the above-described embodiment, the post-evaporator temperature sensor 36 is provided at the air downstream side portion of the refrigerant evaporator 4,
The on / off control of the electromagnetic clutch 18a is performed based on the temperature detected by the post-evaporator temperature sensor 36 to prevent the refrigerant evaporator 4 from frosting. However, between the refrigerant evaporator 4 and the refrigerant compressor 18, A well-known low-pressure pressure control valve is provided so that the low-pressure pressure of the refrigerant evaporator 4 is always maintained at a predetermined value or higher, so that the refrigerant evaporator 3 is prevented from frosting without providing the after-evaporator temperature sensor 36. It may be configured.

[0022]

In the vehicle air conditioner of the present invention, when the temperature of the engine cooling water is low at the start of the heating operation, the cooling means is operated to reduce the humidity of the air blown from the defroster air outlet. Therefore, it is possible to prevent fogging of the window glass.

[Brief description of drawings]

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

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

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

FIG. 4 is a graph showing an outlet mode control characteristic.

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

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

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

FIG. 8 is a graph showing blower control characteristics.

FIG. 9 is a graph showing control of a blower at the start of 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 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 blowout humidity corresponding to a running state of the vehicle and an operating state of the refrigerant compressor.

[Explanation of symbols]

1 Vehicle Air Conditioner 2 Duct 3 Blower (Blower) 5 Heater Core (Heating Means) 9 Defroster Blower 11 Face Blowout 10 Foot Blowouts 12a, 13a, 14a Blowout Door (Blowout Opening / Closing Means) 16 Microcomputer ( Control means) 37 Water temperature sensor (water temperature detection means) S Refrigeration cycle (cooling means)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Noriyoshi Miyajima 1-1-1, Showa-cho, Kariya city, Aichi prefecture Nihon Denso Co., Ltd.

Claims (1)

[Claims] Claims: 1. A) a plurality of outlets that are open at various places inside the vehicle compartment, including a defroster outlet that opens toward the window glass of the vehicle; and b) a blower that includes a defroster mode that selects the defroster outlet. An outlet opening / closing means for selectively opening / closing the plurality of outlets according to an outlet mode; c) a duct for guiding blown air to the outlet opened by the outlet opening / closing means; and d) via this duct. Blowing means for blowing air into the vehicle compartment, e) cooling means for cooling air flowing in the duct, f) heating means for heating air passing through the engine cooling water as a heat source, and g) engine cooling water. When the heating operation is performed and the detected value of the water temperature detecting means is equal to or less than a predetermined value, the air blowing amount of the air blowing means is controlled to be equal to or less than the predetermined air amount. , Controls the air outlet opening and closing means so that the defroster mode is set,
An air conditioner for a vehicle, further comprising: a control unit that controls the cooling unit to operate the cooling unit.