KR101578492B1 - Air conditioning system for automotive vehicles - Google Patents

Abstract

The present invention relates to a vehicle air conditioner having a suction type cooling unit and is configured to cool air blown into a passenger compartment without separately installing an indoor heat exchanger of a suction type cooling unit in an air conditioner case, And it is an object of the present invention to eliminate the need for a separate space.
In order to accomplish the above object, the present invention provides a method of cooling an air in a passenger compartment of a passenger compartment of a vehicle, comprising: a heater core that heats air blown into a passenger compartment by introducing hot engine cooling water; Wherein the adsorption type cooling unit comprises an evaporator having an internal flow path through which the first refrigerant is circulated and the first refrigerant is circulated and a second refrigerant flow path through which the first refrigerant in the first flow path is circulated, The first and second adsorbers for adsorbing the refrigerant alternately, the engine cooling water circulated to the heater core is restricted at the time of entering the cooling mode, and the second refrigerant cooled in the absorption type cooling unit is supplied to the heater core So that the heater core cools the air blown into the passenger compartment; The second refrigerant of the adsorption type cooling unit circulated to the heater core is limited and circulates the engine cooling water heated by the engine to the heater core to cause the heater core to heat the air blown into the passenger compartment, Respectively.

Description

TECHNICAL FIELD [0001] The present invention relates to an air conditioning system for an automobile,

The present invention relates to an air conditioner for a vehicle having a suction type cooling unit, and more particularly, to an air conditioner for an air conditioner in which an indoor heat exchanger of a suction type cooling unit is not installed separately, So that it is possible to prevent unnecessary air resistance due to the installation of the air conditioner.

2. Description of the Related Art In recent years, a variety of vehicle air conditioners capable of increasing the fuel efficiency of a vehicle and reducing noise and vibration have been developed. As one example thereof, there is a vehicle air conditioner using a suction type auxiliary cooling unit (hereinafter referred to as "absorption type cooling unit").

The adsorption type cooling unit subcooled the interior of the vehicle by using the heat of vaporization generated in the process of adsorbing refrigerant of the adsorbent. As shown in FIG. 1, the evaporator 1, the first and second adsorbers 3 and 5, A condenser 7, and an indoor heat exchanger 9.

The evaporator (1) has an internal flow passage (1a) in which the first refrigerant is stored and the second refrigerant can be introduced and flowed. Here, the first and second refrigerants are usually composed of a fluid having the same composition as the engine cooling water, that is, water (H ₂ O).

The first and second adsorbers 3, 5 contain a solid adsorbent such as silica gel, zeolite or the like and adsorb the first refrigerant alternately stored in the evaporator 1. Accordingly, the first refrigerant of the evaporator 1 is vaporized and the heat of the second refrigerant flowing along the internal flow path 1a is taken away. As a result, the second refrigerant in the inner flow path 1a is cooled.

Here, when one of the first and second adsorbers 3 and 5 adsorbs the first refrigerant of the evaporator 1, the other one desorbs the first refrigerant adsorbed.

The condenser 7 introduces the first refrigerant desorbed from any one of the first and second adsorbers 3 and 5, condenses it, and liquefies it. Then, the liquefied first refrigerant is returned to the evaporator (1).

The indoor heat exchanger (9) is installed in the internal passage (12) of the air conditioner case (10). Particularly, the indoor heat exchanger 9 installed in parallel on the downstream side or the upstream side of the evaporator 14 introduces the second refrigerant cooled in the evaporator 1, Exchanges heat with air blown into the room. Thus, the air blown into the passenger compartment is cooled. Thus, the interior of the vehicle is cooled.

In the conventional vehicle air conditioner, since the indoor heat exchanger 9 of the absorption type cooling unit is installed in the internal passage 12 of the air conditioner case 10, a separate space is secured for installing the indoor heat exchanger 9 There is a problem in that the size of the air conditioner case 10 is increased due to such a disadvantage.

In addition, there is a disadvantage in that the flow resistance of the air increases due to the indoor heat exchanger 9 of the absorption type cooling unit installed in the inner passage 12 of the air conditioner case 10. This disadvantage is caused by the air flow rate of the air There is a problem that it is remarkably reduced.

Particularly, since the air volume of the air supplied to the passenger compartment is reduced, there is a drawback that the cooling and heating efficiency of the passenger compartment is remarkably reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an air conditioner which can exchange heat between the cool air of the absorption type cooling unit and the air inside the air conditioning case without separately installing an indoor heat exchanger of the absorption type cooling unit And an air conditioner for a vehicle.

It is another object of the present invention to provide an air conditioner in which the cooling air of the absorption type cooling unit and the air inside the air conditioner case can be exchanged with each other without separately installing an indoor heat exchanger of the absorption type cooling unit, And a vehicle air conditioner.

A further object of the present invention is to provide a vehicle air conditioner which can reduce the size of the air conditioning case and thus make it possible to reduce the size and slimness of the device by eliminating the need to secure a separate space for installing the indoor heat exchanger .

It is a further object of the present invention to provide an air conditioner in which the cooling air of the absorption type cooling unit and the air inside the air conditioner case can be exchanged with each other without installing the indoor heat exchanger of the absorption type cooling unit, Which is capable of preventing unnecessary air resistance of the vehicle.

It is a further object of the present invention to provide an air conditioner which is capable of preventing unnecessary air resistance inside the air conditioner case, thereby increasing the air volume of the air supplied to the vehicle interior, The present invention provides an air conditioner for a vehicle.

In order to achieve the above object, a vehicle air conditioning system of the present invention comprises: a heater core for introducing hot engine cooling water to heat air blown into a passenger compartment; And an adsorption type cooling unit for cooling the air, wherein the adsorption type cooling unit comprises: an evaporator having an internal flow path in which a first refrigerant is stored and a second refrigerant is circulated; and a second refrigerant Wherein the engine cooling water circulated to the heater core is restricted at the time of entering the cooling mode, and the engine coolant is circulated to the heater core at the time of entering the cooling mode, The second cooling medium cooled in the absorption type cooling unit is circulated to the heater core to cool the air blown into the vehicle interior And; The second refrigerant of the adsorption type cooling unit circulated to the heater core is limited and the engine cooling water heated by the engine is circulated to the heater core to heat the air blown into the vehicle interior by the heater core And a fluid control means for controlling the flow rate of the fluid.

Preferably, the fluid control means includes a cooling water introduction line for introducing the cooling water of the engine into the heater core; A cooling water return line for returning engine cooling water circulated in the heater core to the engine; A refrigerant introduction line for introducing the second refrigerant of the adsorption type cooling unit into the heater core; A refrigerant line for returning the second refrigerant circulating through the heater core to the adsorption type cooling unit; Wherein the cooling water introduction line is opened and the introduction of engine cooling water into the heater core is restricted when the cooling water introduction line enters the cooling mode, The introduction of the second refrigerant is allowed, and when the heating mode is entered, the opening amount of the refrigerant introduction line is limited and the cooling water introduction line is opened to allow introduction of engine cooling water into the heater core, Flow control valves; When the cooling mode is entered, the outlet side of the heater core and the refrigerant return line are communicated to return the second refrigerant circulating in the heater core to the adsorption type cooling unit, and when the heating mode is entered, And a direction control valve that communicates the outlet side and the cooling water return line to return the engine cooling water circulated through the heater core to the engine.

According to the vehicle air conditioner of the present invention, since the second refrigerant of the absorption type cooling unit is introduced into the existing heater core and utilized as a "cooling indoor heat exchanger ", a separate indoor heat exchanger is installed inside the air conditioning case There is an effect that is not necessary.

Further, since there is no need to provide a separate indoor heat exchanger in the air conditioning case, it is not necessary to secure a separate space for installing the indoor heat exchanger.

Further, since the structure does not require a separate space for installing the indoor heat exchanger, it is possible to reduce the size of the air conditioning case, thereby making it possible to reduce the size and slimness of the apparatus.

Further, since there is no need to provide a separate indoor heat exchanger inside the air conditioning case, unnecessary air resistance inside the air conditioning case can be prevented.

Further, since the structure can prevent unnecessary air resistance inside the air conditioner case, it is possible to increase the air volume of the air supplied to the vehicle interior, thereby remarkably improving the cooling and heating efficiency of the vehicle interior have.

Further, since the low temperature refrigerant of the adsorption type cooling unit and the high temperature cooling water of the engine can be mixed and introduced into the heater core, and the mixing ratio thereof can be controlled, the temperature of the heater core can be adjusted as needed.

In addition, since the temperature of the heater core can be adjusted as needed, the cooling performance of the heater core can be controlled, thereby providing an effect of actively coping with the cooling load in the interior of the vehicle.

Further, since the structure is capable of actively coping with the cooling load in the car interior, there is an effect that the temperature in the car interior can always be maintained comfortably regardless of the external temperature condition.

1 is a view showing a configuration of a conventional automotive air conditioner,
2 is a view showing a configuration of a vehicle air conditioner according to the present invention,
FIG. 3 is an operation diagram showing an operation example of the present invention, and is a diagram showing a case where the air conditioning apparatus enters a heating mode,
FIG. 4 is an operation diagram showing an operation example of the present invention, and shows a case where the air conditioning apparatus enters the cooling mode.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a vehicle air conditioner according to the present invention will be described in detail with reference to the accompanying drawings.

First, a vehicle air conditioner according to the present invention will be briefly described with reference to FIG.

A vehicle air conditioner includes an air conditioner case (10), and a heater core (16) is provided in an internal passage (12) of the air conditioner case (10).

The heater core 16 has an internal flow passage (not shown) through which the cooling water of the engine 18 can flow. After the introduction of the high-temperature engine cooling water, the introduced engine cooling water and the air blown into the vehicle interior Heat exchange with each other. Thus, the air blown into the passenger compartment is heated. As a result, the interior of the vehicle is heated.

Here, the heater core 16 introduces the cooling water of the engine 18 through the cooling water introduction line 20, and returns the introduced engine cooling water to the engine 18 through the cooling water return line 22.

The air conditioning apparatus has a suction type cooling unit (30). The adsorption cooling unit 30 has an evaporator 32, first and second adsorbers 34 and 36, and a condenser 38.

The evaporator 32 stores the first refrigerant and has an inner flow path 32a through which the second refrigerant can flow. Typically, the first and second refrigerants consist of a fluid of the same composition as the engine coolant, i.e., water (H ₂ O).

The first and second adsorbers (34, 36) contain a solid adsorbent and alternately adsorb the first refrigerant stored in the evaporator (32). Accordingly, the first refrigerant of the evaporator 32 is vaporized and the second refrigerant of the internal flow path 32a can be cooled. Here, when one of the first and second adsorbers 34 and 36 adsorbs the first refrigerant of the evaporator 32, the other one desorbs the first refrigerant adsorbed.

The condenser 38 introduces the first refrigerant desorbed from any one of the first and second adsorbers 34 and 36, condenses it, and liquefies it. Then, the liquefied first refrigerant is returned to the evaporator 32 again.

Next, the features of the air conditioner for a vehicle according to the present invention will be described in detail with reference to Fig.

The air conditioning apparatus of the present invention includes a refrigerant introduction line 40 for introducing the second refrigerant cooled in the evaporator 32 of the absorption type cooling unit 30 into the heater core 16 of the air conditioner case 10 do.

The coolant introduction line (40) communicates with the coolant introduction line (20). When the air conditioning apparatus enters the "cooling mode ", the communicated refrigerant introduction line 40 introduces the second refrigerant cooled by the evaporator 32 of the adsorption type cooling unit 30 into the heater core 16 .

Therefore, in the "cooling mode ", the second low-temperature refrigerant is introduced into the heater core 16 to flow. This allows the second coolant of low temperature and the surrounding air of the heater core 16 to be heat-exchanged with each other.

As a result, in the "cooling mode ", the heater core 16 can perform the same function as the conventional indoor heat exchanger (see Fig. 1). This allows the air blown into the passenger compartment to be cooled without a separate indoor heat exchanger, whereby the passenger compartment can be cooled.

On the other hand, flow control valves 50 are provided in the refrigerant introduction line 40 and the cooling water introduction line 20, respectively.

The flow control valves 50 are configured such that when the air conditioner enters the "cooling mode ", the refrigerant introduction line 40 is opened and the cooling water introduction line 20 is blocked .

Thus, in the "cooling mode ", the hot engine cooling water introduced into the heater core 16 is blocked, and the second refrigerant of the adsorption type cooling unit 30 can be introduced into the heater core 16. [ This allows the heater core 16 to be turned into a "cooling heat exchanger" in the "cooling mode ".

Conversely, the flow control valves 50 are configured to shut off the refrigerant introduction line 40 and open the cooling water introduction line 20 when the air conditioning apparatus enters the "heating mode ".

Thus, in the "heating mode ", the introduction of engine cooling water into the heater core 16 is permitted and the second refrigerant of the adsorption cooling unit 30 introduced into the heater core 16 is shut off. This allows the heater core 16 to return to the "heating heat exchanger" role in the "heating mode ".

Here, the flow rate control valves 50 are controlled by the control unit 60. The control unit 60 is provided with a microprocessor. When the air conditioner enters the "cooling mode" or enters the "heating mode ", the control unit 60 outputs a corresponding control signal, Lt; / RTI >

Thus, the flow control valve 50 can be controlled in accordance with the "cooling mode" or "heating mode ". This allows the second refrigerant of the adsorption type cooling unit 30 to be introduced into the heater core 16 in the "cooling mode" and the cooling water of the engine 18 is supplied to the heater core 16 ). ≪ / RTI > As a result, the heater core 16 can be mutually converted into a "cooling heat exchanger" or a "heating heat exchanger ".

On the other hand, the control unit 60 is configured to control the opening amounts of the flow control valves 50 in the cooling mode, respectively. Therefore, in the cooling mode, it is configured to control the low-temperature refrigerant introduced into the heater core 16 and the high-temperature engine coolant flow rate, respectively.

Particularly, when the cooling load of the vehicle interior is large, the flow rate of the low-temperature refrigerant introduced into the heater core 16 is increased and the flow rate of the high-temperature engine cooling water introduced into the heater core 16 is controlled.

On the contrary, when the cooling load of the vehicle interior is small, the flow rate of the low-temperature refrigerant introduced into the heater core 16 is reduced, and the flow rate of the high-temperature engine cooling water introduced into the heater core 16 is controlled to be increased.

Therefore, the control unit 60 is configured to control the cold coolant temperature for the heater core 16 and the hot engine coolant introduction rate, respectively, according to the coolant load in the vehicle interior. As a result, the temperature of the heater core 16 can be actively controlled according to the cooling load in the car interior. Thereby, the cooling performance of the heater core 16 can be automatically adjusted according to the cooling load of the vehicle interior.

Here, the controller 60 stores in advance each of the "opening amount control values" of the flow control valves 50 for each "cooling load in the car " The amount of the control is controlled according to the cooling load in the car interior.

On the other hand, when the control unit 60 is released from the "heating mode ", the control unit 60 controls the flow control valve 50 of the cooling water introduction line 20 to shut off the cooling water introduction line 20. In particular, when the cooling mode is not canceled in the "heating mode ", the cooling water introduction line 20 is blocked. Thus, the cooling water for the engine 18 introduced into the heater core 16 is blocked.

The reason for this configuration is to prevent the heater core 16 from being unnecessarily heated when released in the "heating mode ", whereby the air supplied to the inside of the car is released It is possible to prevent unnecessary heating.

2, the air conditioning apparatus of the present invention includes a refrigerant return line 70 for returning the second refrigerant introduced into the heater core 16 to the evaporator 32 of the adsorption type cooling unit 30 .

The refrigerant return line 70 communicates with the cooling water return line 22 and the direction control valve 80 is provided at a connection point between the cooling water return line 22 and the refrigerant return line 70.

Direction control valve 80 is a three-way valve controlled by the control unit 60. When the air conditioner enters the "cooling mode ", the outlet side of the heater core 16 and the refrigerant return line 70 are communicated . Thus, the second refrigerant discharged from the heater core 16 can be introduced into the evaporator 32 side of the adsorption type cooling unit 30. [

Thus, in the "cooling mode", the second refrigerant introduced into the heater core 16 can be returned while being returned to the adsorption type cooling unit 30. As a result, in the "cooling mode ", the heater core 16 continues to function as a" cooling heat exchanger ".

Conversely, when the air conditioner enters the "heating mode ", the outlet side of the heater core 16 and the cooling water return line 22 are communicated with each other. Thus, the second coolant discharged from the heater core 16 can be introduced into the coolant return line 22.

This allows the engine cooling water introduced into the heater core 16 to be circulated while being returned to the engine 18 in the "heating mode ". This allows the heater core 16 to serve as a "heating heat exchanger" in the "heating mode ".

Next, an operation example of the present invention having such a configuration will be described with reference to Figs. 3 and 4. Fig.

First, a case in which the air conditioning apparatus enters the "heating mode" will be described with reference to FIG.

When the air conditioning apparatus enters the "heating mode ", the flow control valves 50 shut off the refrigerant introduction line 40 and increase the opening amount of the cooling water introduction line 20. [

Then, the high-temperature cooling water discharged from the engine 18 flows into the heater core 16 through the cooling water introduction line 20.

At this time, the heater core 16 into which the high-temperature engine cooling water has flowed serves as a "heating heat exchanger" and heats the air blown into the passenger compartment. Therefore, the car interior is heated.

On the other hand, when the air conditioning apparatus enters the "heating mode ", the directional control valve 80 blocks the refrigerant return line 70 and opens the cooling water return line 22.

As a result, the engine cooling water of the heater core 16 after the heating of the air is returned to the engine 18 while being discharged to the cooling water return line 22. The engine cooling water returned to the engine 18 is reheated by the engine 18 and then circulated to the heater core 16 again. Thus, the heater core 16 continues to perform "heat exchanger for heating ".

Next, a case where the air conditioning apparatus enters the "cooling mode" will be described with reference to FIG.

When the air conditioning apparatus enters the "cooling mode ", the flow control valves 50 open the refrigerant introduction line 40 and reduce or cut off the opening amount of the cooling water introduction line 20. [

Then, the low-temperature second refrigerant discharged from the evaporator 32 of the absorption type cooling unit 30 flows into the heater core 16 through the refrigerant introduction line 40.

At this time, the heater core 16 into which the low-temperature second refrigerant flows serves as a "cooling heat exchanger" and cools the air blown into the passenger compartment. Therefore, the interior of the vehicle is cooled.

On the other hand, the flow control valves 50 also control the amount of opening of the refrigerant introduction line 40 and the cooling water introduction line 20, respectively, in accordance with the cooling load of the vehicle interior.

Therefore, the low temperature coolant and the high temperature engine coolant introduction rate to the heater core 16 are controlled according to the cooling load in the car interior. As a result, the temperature of the heater core 16 is actively controlled in accordance with the cooling load of the vehicle interior, and the cooling performance is automatically controlled.

On the other hand, when the air conditioner enters the "cooling mode ", the directional control valve 80 opens the refrigerant return line 70 and blocks the cooling water return line 22.

As a result, the second refrigerant of the heater core 16 after the cooling of the air is discharged to the refrigerant return line 70 and returned to the adsorption type cooling unit 30. The second refrigerant returned to the adsorption type cooling unit (30) is recycled by the adsorption type cooling unit (30) and circulated back to the heater core (16). Thus, the heater core 16 continues to serve as a "heat exchanger for cooling ".

According to the air conditioner of the present invention having such a configuration, since the second refrigerant of the suction type cooling unit 30 is introduced into the existing heater core 16 and utilized as a "cooling indoor heat exchanger & It is not necessary to provide a separate indoor heat exchanger inside the indoor heat exchanger.

Further, since it is not necessary to provide a separate indoor heat exchanger in the air conditioning case 10, it is not necessary to secure a separate space for installing the indoor heat exchanger.

In addition, since it is not necessary to secure a separate space for installing the indoor heat exchanger, it is possible to reduce the size of the air conditioner case 10, thereby making it possible to make the apparatus compact and slim.

In addition, since no separate indoor heat exchanger is provided inside the air conditioning case 10, unnecessary air resistance inside the air conditioning case 10 can be prevented.

In addition, since the structure can prevent unnecessary air resistance inside the air conditioner case 10, it is possible to increase the air volume of the air supplied to the vehicle interior, thereby remarkably improving the cooling and heating efficiency of the vehicle interior have.

Since the low temperature refrigerant of the adsorption type cooling unit 30 and the high temperature cooling water of the engine 18 can be mixed and introduced into the heater core 16 and the mixing ratio thereof can be controlled, Can be adjusted as needed.

In addition, since the temperature of the heater core 16 can be adjusted as needed, the cooling performance of the heater core 16 can be adjusted, thereby being able to actively cope with the cooling load in the car interior.

Further, since the structure is capable of actively coping with the cooling load in the car interior, the temperature in the car interior can always be maintained comfortably regardless of the external temperature condition.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

10: Air conditioning case (Case) 12: Internal passage
16: Heater Core 18: Engine
20: Cooling water introduction line 22: Cooling water return line
30: Absorption type cooling unit (Unit) 32: Evaporator
34: first adsorber 36: second adsorber
38: condenser 40: refrigerant introduction line
50: Flow control valve (Valve) 60: Control section
70: Refrigerant return line 80: Directional control valve

Claims (7)

A heater core 16 for heating the air blown into the passenger compartment by introducing cooling water and a suction cooling unit 30 for cooling the air blown into the passenger compartment by the heat of vaporization generated when the adsorbent is adsorbed by the refrigerant, , Wherein the adsorption type cooling unit (30) comprises: an evaporator (32) having an internal flow path (32a) in which a first refrigerant is stored and a second refrigerant is circulated; and an evaporator (34, 36) for alternately adsorbing the first refrigerant of the evaporator (32) so as to cool the second refrigerant of the evaporator (32a), the first and second adsorbers
The cooling water of the engine 18 circulated to the heater core 16 is limited and the second refrigerant cooled in the absorption type cooling unit 30 is circulated to the heater core 16, Allowing the core 16 to cool the air blown into the passenger compartment;
In the heating mode, the second refrigerant of the adsorption type cooling unit 30 circulated to the heater core 16 is limited, and the engine cooling water heated in the engine 18 is circulated to the heater core 16 And fluid control means for heating the air blown into the vehicle interior by the heater core (16). The method according to claim 1,
Wherein the fluid control means comprises:
A cooling water introduction line (20) for introducing the cooling water of the engine (18) into the heater core (16);
A coolant return line (22) for returning engine coolant circulated through the heater core (16) to the engine (18);
A refrigerant introduction line (40) for introducing the second refrigerant of the adsorption type cooling unit (30) into the heater core (16);
A refrigerant return line (70) for returning the second refrigerant circulating through the heater core (16) to the adsorption type cooling unit (30);
The coolant introduction line 20 and the coolant introduction line 40 are respectively provided with a coolant introduction line 20 and a coolant introduction line 40. When the coolant introduction line 20 enters the cooling mode, The amount of opening of the refrigerant introduction line 40 is limited and the cooling water introduction line 20 is opened when the heating mode is entered, A flow control valve (50) that permits introduction of engine cooling water into the heater core (16) and restricts the introduction of the second refrigerant;
When the cooling mode is entered, the outlet side of the heater core 16 is communicated with the refrigerant return line 70, and the second refrigerant circulated through the heater core 16 is returned to the adsorption type cooling unit 30 And communicates the outlet side of the heater core 16 with the cooling water return line 22 to return the engine cooling water circulated through the heater core 16 to the engine 18 when the heating mode is entered And a direction control valve (80). 3. The method of claim 2,
Wherein the cooling water of the engine (18) and the second refrigerant of the adsorption type cooling unit (30) are fluids of the same component. The method of claim 3,
The flow control valves (50)
And controls the flow rate of the second refrigerant of the adsorption type cooling unit (30) introduced into the heater core (16) and the flow rate of cooling water of the engine (18) Can be controlled. 5. The method of claim 4,
Further comprising a controller (60) for controlling the amount of opening of the flow control valves (50)
The control unit (60) controls the introduction rate of the second refrigerant and the engine cooling water to the heater core (16) in accordance with the cooling load of the vehicle interior in the cooling mode, And controls the temperature of the heater core (16). 6. The method of claim 5,
The control unit (60)
The second refrigerant flow rate introduced into the heater core 16 gradually increases and the flow rate of the engine cooling water introduced into the heater core 16 gradually decreases as the cooling load of the vehicle interior increases,
The second cooling medium flow rate introduced into the heater core 16 is gradually reduced as the cooling load of the vehicle interior is decreased and the flow rate of the engine cooling water introduced into the heater core 16 is gradually increased. And controls the flow rate control valves (50). The method according to claim 5 or 6,
The control unit (60)
Controls the flow rate control valve (50) so as to shut off the cooling water of the engine (18) introduced into the heater core (16) when released from the heating mode.

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