JPH10203146A - Air-conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the rise property of heating even in a vehicle having a slow temperature rising speed of cooling water for an engine and to provide excellent energy saving ability, defogging ability, and comfortability of an occupant. SOLUTION: After the starting of an engine, heating is effected by a full internal air circulation system by means of a condenser 60 and a heater core 80, serving as a heat source. Wen heating by the condenser 60 is released, an intake door 30 is operated and the full internal air circulation system is released to maintain defogging ability. A amount of temperature lowering at the supply opening of an air-conditioning due to release of heating by the condenser 60 is predicted and based on the prediction value, a voltage applied on a blower fan 40 is reduced and an airflow in a duct housing 100 is decreased to increase a quantity of heat imparted on air during the passage of air through the heater core 80, and a supply opening temperature is maintained.

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.

[0002]

2. Description of the Related Art A conventional vehicle air conditioner, particularly a vehicle air conditioner of the air mix type, has a configuration as shown in FIG. The blown air is cooled or heated when passing through the evaporator 50 and the heater core 80, and is defrosted by a door (not shown), a defroster duct 91, a ventilator duct 92 or a foot duct 9.
It is blown out into the vehicle interior through 3. At this time, the opening degree of the intake door 30, the amount of the refrigerant circulating in the evaporator 50, the opening degree of the air mix door 70, and the like are controlled to perform heating, dehumidification, cooling, and the like.

In such a vehicle air conditioner, as a heat source used for heating, it is common to use cooling water after cooling the engine 200 as described above. Therefore, when the engine is cold-started in a situation where the outside air temperature is low, it takes a relatively long time for the cooling water to warm to a temperature suitable as a heat source for heating.

Further, in a vehicle equipped with a large diesel engine having a relatively low idling speed or a hybrid car using an internal combustion engine and an electric motor as power sources, the rising speed of the cooling water temperature accompanying the warm-up operation is low, and the engine For a while after the start, heating cannot be performed, and the comfort in the vehicle compartment is impaired. In addition, since dehumidification cannot be performed sufficiently, fogging may occur in each window in the vehicle compartment.

On the other hand, there has been proposed a hybrid vehicle air conditioner having a heat pump type heating device in addition to the above-described heater core 80 as a heat source for heating. As shown in FIG. 5, this hybrid vehicle air conditioner is obtained by further adding a condenser 60 to a conventional vehicle air conditioner. The hybrid vehicle air conditioner shown in FIG. 5 has the same configuration as the conventional vehicle air conditioner shown in FIG. 4 except that a condenser 60 is provided downstream of the evaporator 50. Are denoted by the same reference numerals and description thereof is omitted. In the following, the heating by the condenser 60 is performed by heating the air conditioner and the heater core 80.
Is called heater core heating.

The air conditioner for a hybrid vehicle shown in FIG. 5 uses both air conditioner heating and heater core heating until a sufficient amount of heat is supplied to the heater core 80, while supplying a sufficient amount of heat to the heater core. As a result, the heating of the air conditioner is stopped and only the heating of the heater core is performed.

[0007] In this hybrid vehicle air conditioner, the intake door 30 is provided with the intake door 30 shown in FIG. 5 in order to increase the vehicle interior temperature rising speed after the start of heating as much as possible during heating using both air conditioner heating and heater core heating. It is set at the position shown by the two-dot chain line, and is operated in a full inside air circulation mode in which the introduction of outside air is shut off and air in the vehicle compartment is circulated. At this time, the water vapor in the vehicle cabin does not fog due to the water vapor adhering to the cooled window due to the dehumidifying action of the evaporator 50 by heating the air conditioner.

[0008] According to such a hybrid vehicle air conditioner, after the engine is started, the air conditioner heating makes up for the insufficient heating capacity of the heater core, so that the warm air can be blown into the vehicle compartment in a relatively short time. Become
By heating only the heater core when the temperature of the hot water after engine cooling reaches a predetermined temperature or more, the comfort of the occupant and the energy saving, which is an advantage of the conventional heater core type heating, are simultaneously maintained. Becomes possible.

As described above, according to the hybrid vehicle air conditioner, it is possible to achieve occupant comfort and energy saving, but it is compared with the conventional heater core type vehicle air conditioner in which heating is performed. For example, for dehumidification and heating, it is necessary to operate the exterior unit 300 of the air conditioner heating device to circulate the refrigerant through the evaporator 50 and the condenser 60, and the load on the engine increases. Therefore, it is desired to stop the heating of the air conditioner as soon as possible from the viewpoint of energy saving and to switch to the operation of heating only the heater core.

However, if the heating of the air conditioner is simply stopped in a state where the amount of heat supplied to the heater core 80 is insufficient in consideration of energy saving, the following problem occurs. That is, the dehumidifying function of the evaporator 50 is stopped in accordance with the stoppage of the heating of the air conditioner. Therefore, when the operation of the air conditioner is continued in the full inside air circulation mode, the window is soon clouded by the water vapor in the vehicle compartment. On the other hand, in order to prevent fogging of the window without using the dehumidifying function of the evaporator 50, it is necessary to rotate the intake door 30 clockwise in FIG. 5 to release the full inside air circulation mode and introduce outside air. There is.

Next, as described above, a new problem occurs when the amount of heat supplied to the heater core 80 is not enough and the heating of the air conditioner is stopped, that is, when the outside air is introduced with the heating capacity reduced. Will be described.

By releasing the full inside air circulation mode and introducing outside air which is cooler than the air circulating in the passenger compartment into the air conditioner, and by stopping heating of the air conditioner, the heating capacity is reduced, so that the heater core is reduced. The temperature of the air immediately before passing through 80 decreases. Therefore, the temperature of the air passing through the heater core 80 and flowing into the vehicle interior through the defroster duct 91 and the foot duct 93 also decreases.

As described above, in the hybrid vehicle air conditioner, if the heating of the air conditioner is stopped before the heating capacity of the heater core heating is sufficient, the temperature of the air blown into the vehicle interior decreases and the relative humidity increases. The window sometimes fogged (condensation). Further, the temperature in the passenger compartment and the temperature of the air blown out from the foot duct 93 (the blowout temperature) may suddenly decrease, and the comfort of the occupant may decrease.

[0014]

SUMMARY OF THE INVENTION According to the present invention, it is possible to quickly switch from the combined operation of the air conditioner heating and the heater core heating to the heater core heating independent operation without impairing the occupant's comfort and maintaining the anti-fog property. It is an object of the present invention to provide a vehicle air conditioner excellent in energy saving.

[0015]

FIG. 1 shows an embodiment of the present invention.
The present invention will be described with reference to FIG. (1) The vehicle air conditioner according to the first aspect of the present invention includes: a first heat source 80 using a cooling medium of a vehicle-mounted device; a second heat source 60 using an air conditioner cycle capable of a dehumidifying and heating operation;
During the heating operation, when the amount of heat obtained from the first heat source 80 does not reach the first predetermined value, the combined heating mode using both the first and second heat sources 80 and 60 is selected,
Heating mode selection means 1010B for selecting a normal heating mode using only first heat source 80 when the amount of heat obtained from first heat source 80 reaches a first predetermined value; heating selected by heating mode selection means 1010B A blower fan 40 for blowing air warmed based on the mode into the vehicle interior; when the heating mode selecting means 1010B selects the combined heating mode, the heating operation is performed in the inside air circulation mode in which the air in the vehicle interior is circulated and air-conditioned. When the mode selection means 1010B switches from the combined heating mode to the normal heating mode, the present invention is applied to a vehicle air conditioner having an air conditioning control means 1010A for releasing the inside air circulation mode. And, by the air conditioning control means 1010A,
The above object is achieved by reducing the amount of air blown by the blower fan 40 when switching from the combined heating mode to the normal heating mode. (2) In the vehicle air conditioner according to claim 2, after the heating mode selection unit 1010B selects the normal heating mode,
When the amount of heat obtained from the first heat source 80 reaches a second predetermined value higher than the first predetermined value, the amount of air blown by the blower fan 40 is increased. (3) In the vehicle air conditioner according to claim 3, the air conditioning control unit 1010A includes a heating mode selection unit 1010A.
B predicts the amount of decrease in the blown air temperature of the air blown into the passenger compartment when switching the heating mode from the combined heating mode to the normal heating mode, and sets the amount of decrease in the blown air amount in accordance with the predicted value of the blown temperature decrease amount I do. (4) In the vehicle air conditioner according to the fourth aspect, at the time of normal heating, the airflow by the blower fan 40 is set at an arbitrary ratio between the airflow passing through the first heat source 80 and the airflow bypassing the first heat source 80. And a flow ratio control means 70 capable of controlling the flow of the heat from the first heat source 80 when the heating mode selecting means 1010B switches the heating mode from the combined heating mode to the normal heating mode. Until the predetermined value is reached, the flow ratio control means 70 controls to increase the ratio of the airflow by the blower fan 40 passing through the first heat source 80.

In the section of the means for solving the above-mentioned problems, which explains the configuration of the present invention, the drawings of the embodiments of the present invention are used to make the present invention easy to understand. However, the present invention is not limited to this.

[0017]

According to the vehicle air conditioner of the present invention,
Even if the heating mode is switched from the air conditioner heating and the heater core heating combined heating mode to the heater core heating mode when the heating capacity by the heater core heating is not sufficient, the blowing temperature and the anti-fog property are reduced by reducing the blower fan volume. It is possible to provide an air conditioner for a vehicle which is excellent in energy saving without losing the comfort of rapid heating which is an advantage of the combined heating mode. Also, when switching to the heater core heating mode, the amount of decrease in the outlet temperature is predicted, and the amount of air blown by the blower fan is determined based on this predicted value. Heating operation that does not give the

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing a configuration of a vehicle air conditioner according to an embodiment of the present invention, FIG. 2 is a diagram showing a transition of a state over time after starting up the air conditioner according to the present invention, and FIG. It is a flowchart which shows a part of control program of the air conditioner for vehicles which concerns on embodiment of this invention. In FIG. 1, the same components as those in FIG. 5 showing the configuration of the vehicle air conditioner according to the related art are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 1, a control unit 1 of a vehicle air conditioner is shown.
000 is a CPU 1 incorporating an air conditioning control program.
010, an operation panel 400 for the driver to set the air conditioning mode and room temperature, and various sensors 51 used for stabilizing the air conditioning control under different environments.
CPUs 0 to 550 via an interface (not shown)
1010.

The CPU 1010 includes an operation panel 400
Air conditioning mode and various sensors 510 to 55 set in
The air-conditioning unit 600 is controlled based on the information obtained from 0, whereby the air cooled or heated to a predetermined temperature through the outlets such as the defroster duct 91, the ventilator duct 92, and the foot duct 93 is blown into the vehicle interior. .

Next, the operation of the vehicle air conditioner will be described in more detail. On an operation panel 400 installed on a dashboard or the like in the vehicle interior, an air conditioner switch 410 is used to select activation or stop of an air conditioner compressor. The mode switch 420 is a switch for selecting an automatic air-conditioning mode, a manual air-conditioning mode, a ventilation mode, or the like. Intake switch 43
0 is a switch for selecting outside air introduction or inside air circulation. The temperature control switch 440 is a switch for setting the temperature in the cabin, and is configured by an up-down key, a dial, and the like. And these switches 410-44
According to the setting of 0, the operating state of the air conditioner is displayed on the display unit 450.

Next, referring to FIG.
The various sensors 510 to 550 connected to the CPU 1010 incorporated in 00 will be described. The suction temperature sensor 510 is installed at a stage subsequent to the condenser 60 installed in the duct housing 100, and detects the temperature of the air that has passed through the evaporator 50 and the condenser 60. The outside air temperature sensor 520 is installed outside the vehicle compartment, for example, in front of a radiator, and detects the outside air temperature. The inside air temperature sensor 530 is installed at a corner or the like of the operation panel 400 and detects the temperature in the vehicle interior. The solar radiation sensor 540 is installed on the upper surface of a dashboard or the like, and detects the amount of solar radiation. Water temperature sensor 550 is attached to inlet tube 80 </ b> A that guides cooling water after cooling the engine to heater core 80, and detects the temperature of the cooling water before passing through heater core 80.

The air-conditioning control unit 1010A of the programs built in the CPU 1010 operates in accordance with the settings of the various switches 410 to 450 described above and the various sensors 510 to 510.
The air conditioning unit 600 is controlled based on the information obtained from 550, and warm air or cool air is blown into the vehicle cabin at a predetermined air volume from a predetermined air outlet. In particular, the temperature control switch 440 is set to a predetermined temperature. , Mode switch 42
When 0 is set to the automatic air-conditioning mode, the CPU 1010 automatically selects the cooling mode or the heating mode based on the information from the various sensors 510 to 550, furthermore, the opening degree of the intake door 30 in the air-conditioning unit 600 and the blower fan. 40, the operation of a compressor (not shown) installed in the outdoor unit 300 and the opening of the air mix door 70 are controlled.
The temperature and flow rate of the air passing through the inside of 00 are adjusted. Then, the airflow that has passed through the duct housing 100 is blown out to the passenger compartment through outlets such as the defroster door 91, the ventilator door 92, and the foot duct 93 according to the selected air conditioning mode, and the temperature in the passenger compartment is set to a predetermined temperature. Adjust.

In the following description of the embodiment, an automatic air-conditioning mode from immediately after engine cold start in a low temperature environment to when cooling water after engine cooling reaches a predetermined temperature, which is a characteristic part of the present invention, will be described. Operation, that is, the outside temperature and the vehicle interior temperature are controlled by the temperature control switch 440.
The operation in the case where the heating operation is automatically selected because the temperature is lower than the target temperature set in the above will be described.

In FIG. 2, the horizontal axis represents time t0 when the engine is started in a cold start state and automatic air conditioning is started.
, And the vertical axis represents the water temperature of the cooling water immediately after engine cooling, which flows into the heater core 80 (FIG. 1) in order from the top, the operation of the heater core heating and the air conditioning heating, and the circulation of air. Mode, the voltage applied to the blower fan, the degree of opening of the air mix door 70 (FIG. 1), and the temperature of the outlet when the conditioned air blows into the passenger compartment. These changes take place on the same time axis. It is shown.

As shown in FIG. 2, at time t0, the engine and the automatic air conditioning are started, and the heating operation starts in the combined heating mode using the air conditioner and the heater core. Then, after starting the automatic air conditioning with the air conditioning heating as the main heat source,
Soon, the outlet temperature reaches the predetermined temperature To, and at this time, the temperature of the cooling water also gradually increases, and the heating capacity also gradually increases. With the increase in the heating capacity, the air mix door rotates a predetermined angle from the full hot position at the beginning of the operation of the air conditioner to the cold side so that a part of the airflow in the duct housing does not pass through the heater core, and the air outlet is provided. The temperature is maintained at a predetermined temperature To.

Thereafter, the temperature of the cooling water flowing into the heater core 80 (FIG. 1) gradually rises with time,
At time t1, temperature Tw1 is reached. At this point, FIG.
The heating mode selection unit 1010B of the program set in the CPU 1010 shown in (1) stops the air conditioner heating and continues only the heater core heating. Further, in order to improve the heating efficiency, the full internal air circulation mode is selected from time t0 to time t1, and at this time, the water vapor in the vehicle compartment is dehumidified by the dehumidifying and heating function of the air conditioner to prevent dew condensation on the window.

After the air conditioner heating is stopped at time t1, that is, after the dehumidifying heating is stopped, the air circulation mode is switched from the full inside air circulation mode to the half inside air to outside air introduction mode to prevent fogging of the window. Thereby, cold outside air is mixed into the air sucked into the duct housing 100, and this air is heated by the heating of the heater core, so that the relative humidity is reduced, so that dew condensation on the window can be prevented.

Next, the control of the voltage applied to the air mix door 70 and the blower fan 40 (FIG. 1) will be described. As the air conditioner heating stops at time t1, the air mix door 70 returns to the full hot position again. It is returned and the blower fan applied voltage is reduced as shown in FIG. This is for the following reasons. In other words, when the heating of the air conditioner is stopped to release the full internal air circulation mode, the air blows into the vehicle interior due to a decrease in the heating capacity and a decrease in the temperature of the air guided into the duct housing 100 as described in the related art. The temperature of the air decreases, which causes problems such as a decrease in comfort of the occupants and fogging of windows due to an increase in the relative humidity in the passenger compartment.

On the other hand, by returning the air mix door 70 to the full hot position, the duct housing 100 is returned.
All the airflow passing through the inside of the heater core 80 is guided so as to pass through the heater core 80, and further, the voltage applied to the blower fan 40 is reduced to reduce the amount of air blown into the duct housing 100, so that the air flowing through the heater core 80 is reduced. By reducing the flow rate per unit time, this duct housing 100
A sufficient amount of heat can be given to the air inside. This does not cause the above-mentioned problems, that is, a decrease in occupant comfort or fogging of the window. The method of adjusting the voltage applied to the blower fan 40 at this time will be described in detail when the operation of the CPU 1010 is described later.

With continued reference to FIG. 2, the temperature of the cooling water flowing into heater core 80 (FIG. 1) rises with time, and the blower fan after the temperature of the cooling water reaches Tw2 at time t2. The operation of 40 will be described.

This water temperature Tw2 is set as a temperature at which a sufficient amount of heat can be secured for heating only by the heater core 80. Therefore, the cooling water temperature immediately before flowing into the heater core 80 reaches Tw2. Even if the voltage applied to the blower fan is raised and returned to the same value as the voltage when the air conditioner is heated and the heater core is used in combination, cool air does not blow out into the passenger compartment. By doing so, the warm air blown into the vehicle interior from the foot duct 93 or the like is maintained at a substantially constant temperature.

Next, referring to FIG. 3, the operation when the program incorporated in the CPU 1010 (FIG. 1) controls the air conditioner as shown in FIG. 2 will be described in detail. This figure 3
The flowchart of the air-conditioning control program shown in FIG. 2 shows the processing contents of the air-conditioning control from time t0 to time t2 in FIG.

When the heating operation in the air conditioner heating / heater core heating combined operation mode starts, the program starts to operate according to the flowchart shown in FIG.
The outside air temperature sensor 520 and the water temperature sensor 5 shown in FIG.
From 50, the outside air temperature and the temperature of the cooling water immediately before flowing into the heater core 80 are detected. In the following description, detecting the cooling water temperature immediately before flowing into the heater core 80 is simply referred to as water temperature detection.

Next, in step S23, it is determined whether or not the heating of the air conditioner can be stopped based on the outside air temperature and the cooling water temperature. If this step is denied, the process returns to step S21 to detect the outside air temperature and the water temperature.

On the other hand, when it is determined in step S23 that the heating of the air conditioner can be stopped, the process proceeds to step S24, and the compressor for the air conditioner is stopped. In step S25, the intake door actuator 30A shown in FIG. 1 is driven to adjust the opening of the intake door 30, and the full internal air circulation mode is released to adjust the mixture ratio between the internal air and the external air.
The air mix door 70 is turned to the full hot side. This corresponds to the air conditioner heating stop operation, the circulation mode switching operation, and the air mix door driving operation at time t1 in FIG.

Subsequently, in step S26, based on the outside air temperature and the water temperature detected in steps 21 and 22 immediately before stopping the heating of the air conditioner, the outlet port temperature decrease amount ΔT
foot, that is, how much the temperature of the air blown into the vehicle compartment will decrease if the rotational speed of the blower fan motor 40 (FIG. 1) is not reduced.

Next, in step S27, step S26
Based on the ΔTfoot obtained in step (1), the amount of voltage reduction ΔVfan applied to the blower fan 40 required to maintain the outlet temperature at the set temperature is determined. Note that this ΔTfoo
As a method of obtaining ΔVfan from t, it may be obtained from a function ΔVfan = f (ΔTfoot) incorporated in the program, or ΔTfan from a data table.
ΔVfan corresponding to ot may be obtained.

Then, based on the above-mentioned ΔVfan, the voltage applied to the blower fan 40 is adjusted in step S28. This corresponds to the operation of reducing the applied voltage to the blower fan at time t1 in FIG.

Next, the processing after step S29, that is, the processing from time t1 to time t2 in FIG. 2 will be described. In step S29, the water temperature is detected. In step S30, the water temperature is lower than Tw2, that is, the heater core 8
If it is determined that the amount of heat supplied to 0 is still insufficient to return to the normal blower fan control state, step S2
Return to 9 and continue monitoring the water temperature. On the other hand, when the water temperature is Tw
When it is determined that two or more, that is, the amount of heat supplied to the heater core 80 is sufficient and it is possible to return to the normal blower fan control state, the process proceeds to step S31, and the voltage applied to the blower fan 40 is reduced to the value before being reduced in step S30. Back,
The switching control program from the air conditioner heating / heater core heating combined operation mode to the heater core independent operation mode ends.

The processing in step S31 described above corresponds to the return operation of the blower fan applied voltage at time t2 in FIG. It is not always necessary to return to the value before the reduction in step S28 at the time of the application voltage return operation of the blower fan, and the amount of increase of the application voltage may be adjusted as needed.

Also, in the above embodiment, an example was described in which cooling water after engine cooling was used as a heat source for heating the heater core in a vehicle such as a hybrid vehicle in which the temperature of engine cooling water rises slowly. The invention is applicable to other types of vehicles. That is, in an electric vehicle, heat generated by a battery or a motor for driving the vehicle can be used as a heat source of the heater core, and a vehicle equipped with a diesel engine or a gasoline engine of a direct injection type can be used. The air conditioner according to the present invention may be applied to a vehicle in which the cooling water temperature rises slowly after cooling the engine because the thermal efficiency is high, such as a vehicle that performs cooling.

Furthermore, in the above description of the embodiment, the control of the air conditioner at the time of switching from the air conditioner heating / air conditioning mode with heater core heating to the air conditioning mode with heater core heating alone has been described. But it can be applied. That is, when the operation mode is switched from the air conditioner heating and heater core heating combined heating mode to the heater core heating only air conditioning mode and the temperature of the cooling water immediately before flowing into the heater core decreases for some reason, or Is decreased, the voltage applied to the blower fan can be reduced based on the expected decrease in the outlet temperature.

As described above, the heating capacity is reduced when the air conditioning mode is switched from the air conditioning mode with the heater core heating to the air conditioning mode with the heater core heating alone, and the air conditioner is released by releasing the full internal air circulation mode. By predicting the amount of decrease in the outlet temperature caused by the decrease in the intake air temperature, the voltage applied to the blower fan 40 is reduced based on the predicted value, and the outlet temperature is reduced by driving the air mix door 70 to the full hot position. Can be kept constant.

It should be noted that the air mix door 70 described above may not always be driven to the full hot position, but may be one in which the opening is finely adjusted in accordance with the situation such as the temperature in the vehicle compartment. The opening of the air mix door may be kept fixed.

In the correspondence between the above-described embodiment and the claims, the heating mode selector 1010B functions as a heating mode selector, the air conditioning controller 1010A controls the air conditioning controller, and the air mix door 70 controls the flow ratio controller. Configure each.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a vehicle air conditioner according to the present invention.

FIG. 2 is a state transition diagram showing transition of a control state of the vehicle air conditioner according to the present invention.

FIG. 3 is a diagram illustrating a C installed in a vehicle air conditioner according to the present invention.
9 is a flowchart illustrating processing of a PU.

FIG. 4 is a diagram showing a configuration of a vehicle air conditioner according to a conventional technique.

FIG. 5 is a diagram showing a configuration of a hybrid vehicle air conditioner using both air conditioner heating and heat core heating according to the related art.

[Description of Signs] 30 intake door 40 blower fan 50 evaporator 60 condenser 70 air mixing door 80 heater core 100 duct housing 300 air conditioner outdoor unit 400 operation panel 510 suction temperature sensor 520 outside air temperature sensor 550 water temperature sensor 1000 control unit 1010 CPU

Claims (4)

[Claims] 1. A first heat source by a cooling medium of a vehicle-mounted device, a second heat source by an air conditioner cycle capable of a dehumidifying heating operation, and a heat amount obtained from the first heat source during a heating operation is a first heat source.
When the heat amount obtained from the first heat source reaches the first predetermined value, the combined heating mode in which the first and second heat sources are used together is selected when the heat amount does not reach the predetermined value. Heating mode selection means for selecting a normal heating mode using only a heat source; a blower fan for blowing air heated based on the heating mode selected by the heating mode selection means into the vehicle interior; and When the combined heating mode is selected, the heating operation is performed in the inside air circulation mode in which the air in the vehicle compartment is circulated and air-conditioned, while the inside air circulation mode is set when the heating mode selection unit switches from the combined heating mode to the normal heating mode. In the air conditioner for a vehicle having an air conditioning control unit to cancel, the air conditioning control unit may be in the combined heating mode. Vehicle air-conditioning apparatus characterized by reducing the air blow amount of the blower fan when switching to the normal heating mode. 2. The vehicle air conditioner according to claim 1, wherein after the heating mode selection means selects the normal heating mode, the amount of heat obtained from the first heat source is smaller than the first predetermined value. An air conditioner for a vehicle, wherein the airflow of the blower fan is increased when a high second predetermined value is reached. 3. The vehicle air conditioner according to claim 1, wherein the air conditioning control unit is configured to switch the heating mode from the combined heating mode to the normal heating mode by the heating mode selection unit. The air conditioner for a vehicle, wherein the amount of decrease in the blown air amount is set according to the predicted value of the amount of decrease in the blown air temperature. 4. The air conditioner for a vehicle according to claim 1, wherein the airflow from the blower fan passes through the first heat source and the first heat source during the normal heating. The air conditioner further includes a flow ratio control unit capable of controlling a flow ratio to an air flow to be bypassed at an arbitrary ratio, wherein the heating mode selection unit switches a heating mode from the combined heating mode to the normal heating mode, Until the amount of heat obtained from the heat source reaches the second predetermined value, the flow rate ratio control means performs control so as to increase a rate at which the airflow by the blower fan passes through the first heat source. Vehicle air conditioner.