KR20180120084A - Air conditioner for vehicle - Google Patents

Abstract

The present invention relates to an air conditioner for a vehicle with a heat pump system structure, which has a simple piping structure and enhances heating performance, thereby reducing a package, and making common use with an air conditioner for an internal combustion engine possible. The air conditioner for a vehicle exchanges heat with the air in an air conditioning case by circulating a refrigerant so as to heat and cool a vehicle interior. That is, provided is the air conditioner having a first heat exchanger exchanging heat with the refrigerant of a refrigerant circulation system, using a coolant as a heating source of the vehicle interior by increasing the temperature through the first heat exchanger, and being disposed in the air conditioning case. The air conditioner comprises: a second heat exchanger allowing a coolant to flow therein and heating the air passing through the same; a first coolant pipe connecting the first heat exchange to the second heat exchanger and acting as a passage for circulation of the coolant; a second coolant pipe branched from the first coolant pipe and exchanging heat with an engine; and a first valve system allowing the coolant flowing in the first coolant pipe to selectively flow into the second coolant pipe.

Description

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

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for a vehicle, and more particularly, to a vehicle air conditioner having a heat pump system structure capable of selectively performing cooling and heating by switching a flow direction of a refrigerant using one refrigerant cycle.

2. Description of the Related Art Generally, an air conditioner for a vehicle includes a cooling system for cooling the interior of a vehicle and a heating system for heating the interior of the vehicle. In the cooling system, air passing through the outside of the evaporator at the evaporator side of the refrigerant cycle is exchanged with the refrigerant flowing inside the evaporator, and the refrigerant is cooled to cool the inside of the vehicle. In addition, the heating system is configured to heat the interior of the vehicle by changing the air passing through the heater core from the heater core side of the cooling water cycle to the heat exchanged with the cooling water flowing inside the heater core.

On the other hand, a heat pump system which can selectively perform cooling and heating by switching the flow direction of refrigerant by using one refrigerant cycle is applied, unlike the above-described vehicle air conditioner. The heat pump system includes an indoor heat exchanger installed inside the air conditioner case for exchanging heat with air blown into the passenger compartment, an outdoor heat exchanger for exchanging heat outside the air conditioner case, and a direction control valve for switching the flow direction of the refrigerant Respectively. Therefore, when the cooling mode is operated according to the flow direction of the refrigerant by the direction control valve, the indoor heat exchanger functions as a cooling heat exchanger. When the heating mode is activated, the indoor heat exchanger functions as a heating heat exchanger .

1 shows a conventional vehicle heat pump system. 1, a conventional vehicular heat pump system includes a compressor 30, a high-pressure side heat exchanger 32, a first expansion valve 34 and a first bypass valve 36, an outdoor heat exchange A low pressure side heat exchanger 60, an accumulator 62, a second expansion valve 56 and a second bypass valve 58.

The compressor (30) compresses and discharges the refrigerant, and the high-pressure side heat exchanger (32) dissipates the refrigerant discharged from the compressor (30). The first expansion valve 34 and the first bypass valve 36 are installed in a parallel structure to selectively pass the refrigerant passed through the high pressure side heat exchanger 32. The outdoor heat exchanger 48 is connected to the first expansion valve (34) or the first bypass valve (36). The low pressure side heat exchanger 60 evaporates the refrigerant that has passed through the outdoor outdoor heat exchanger 48 and the accumulator 62 separates the refrigerant that has passed through the low pressure side heat exchanger 60 into the gas phase and the liquid phase refrigerant .

The second expansion valve 56 selectively expands the refrigerant supplied to the low pressure side heat exchanger 60 and the second bypass valve 58 is installed in parallel with the second expansion valve 56 to be connected to the outdoor heat exchanger 48 and the inlet side of the accumulator 62 are selectively connected to each other. The air conditioning case 10 is provided with a high pressure side heat exchanger 32 and a low pressure side heat exchanger 60 and a tempo door 12 for controlling the mixing amount of cool air and warm air. (20).

The air conditioning case 10 is further provided with an electric heater type PTC heater 70 which is a heat source for assisting the heating performance of the high-pressure side heat exchanger 32. The PTC heater 70 is usually constituted by a high voltage PTC in order to solve the problem that the high-pressure side heat exchanger 32 does not achieve a sufficient heating efficiency due to the characteristics of the heat pump system.

The conventional automotive air conditioner has a problem that the size increases in the vehicle longitudinal direction (the "T" direction in FIG. 1) as the high-pressure side heat exchanger 62 and the high-voltage PTC heater 70, which are indoor condensers, . As the high-voltage PTC becomes thicker in the "T" direction, the improvement of the heating performance and the reduction of the size can not be simultaneously solved.

In addition, since the conventional air conditioner for a vehicle uses a high-pressure side heat exchanger and a high-voltage PTC as an indoor condenser, it can not be commonly used with an air conditioner for an internal combustion engine.

In addition, the conventional automotive air conditioner requires a separate defrost line and a dehumidifying line for the defrost mode and the dehumidification mode, which complicates the overall piping configuration.

In order to solve such a conventional problem, in the present invention, it is possible to reduce the size of the package by improving the heating performance while having a simple piping structure, and to provide a heat pump system structure capable of sharing the electric vehicle air conditioning apparatus with the air conditioning apparatus for the internal combustion engine Of the present invention.

A vehicle air conditioning system according to the present invention is a vehicle air conditioning system having a refrigerant circulation system for circulating a refrigerant and performing heat exchange with air in an air conditioning case to perform cooling or heating in a vehicle interior, And a second heat exchange unit which is provided in the air conditioning case and in which the coolant flows inside and heats the air passing through the coolant, group; A first coolant piping connecting the first heat exchanger and the second heat exchanger and being a passage through which the coolant circulates; A second coolant line branched from the first coolant line to heat exchange with the engine; And a first valve system for selectively flowing coolant flowing through the first coolant line to the second coolant line.

In the above, the first heat exchanger is made of a water-cooled condenser.

In the above, the second heat exchanger is composed of a heater core.

In the above, in the defrost mode or the dehumidification mode, the first valve system is controlled so that the coolant circulates in the engine.

The controller may include a sensor for detecting an outside air temperature and a controller for comparing the outside air temperature sensed by the sensor with a reference temperature. The controller circulates the coolant to the engine when the outside air temperature is lower than the reference temperature, The coolant is controlled to bypass the engine.

In the above, the refrigerant circulation system includes: a first refrigerant pipe in which a compressor, a condenser, a first expansion means, and an evaporator are sequentially formed; A second refrigerant pipe branched from the first refrigerant pipe to bypass the evaporator; And a second valve system for controlling the flow of refrigerant so that the refrigerant passes or bypasses the evaporator.

In the above, the first heat exchanger is provided between the compressor and the condenser, and the second expansion means is provided between the first heat exchanger and the condenser to selectively throttle the refrigerant.

In the above, a low-voltage PTC heater that is electrically heated in the air conditioning case may be further provided.

A third refrigerant pipe branched from the first refrigerant pipe downstream of the branch point of the second refrigerant pipe in the refrigerant flow direction to bypass the evaporator; A third coolant piping that exchanges heat with the battery of the vehicle; And a third expansion means and a chiller sequentially disposed in the third refrigerant pipe, and the chiller exchanges the refrigerant of the third refrigerant pipe and the refrigerant of the third refrigerant pipe.

In the above, the first valve system is configured so that the coolant circulating through the second heat exchanger selectively passes through the first heat exchanger and the engine.

The vehicle air conditioner according to the present invention has a simple piping structure and can reduce the package by improving the heating performance. The electric vehicle air conditioner can be used in common with the air conditioner for the internal combustion engine, It is possible to eliminate the defrost line (piping) and the dehumidifying line (piping), as well as reduce the number of valves, thereby reducing the overall weight, volume and cost. In addition, indoor high voltage PTC heaters can be eliminated to reduce the safety risk of passengers due to high voltage components.

1 shows a conventional heat pump system for a vehicle,
2 shows a vehicle air conditioning system according to a first embodiment of the present invention,
Fig. 3 shows a cooling mode of the vehicle air conditioner according to the first embodiment of the present invention,
4 is a view showing a heating heat pump mode of the automotive air conditioner according to the first embodiment of the present invention,
5 shows a defrosting mode of the vehicle air conditioning system according to the first embodiment of the present invention,
6 shows a dehumidification mode of the automotive air conditioner according to the first embodiment of the present invention,
7 shows a vehicle air conditioning system according to a second embodiment of the present invention,
FIG. 8 shows a vehicle air conditioner according to a third embodiment of the present invention,
9 shows a vehicle air conditioning system according to a fourth embodiment of the present invention.

Hereinafter, the technical configuration of the air conditioner for a vehicle will be described in detail with reference to the accompanying drawings.

2 shows a vehicle air conditioning system according to a first embodiment of the present invention.

2, the vehicle air conditioning system according to the first embodiment of the present invention includes a refrigerant circulation system 100 and a coolant loop 200. [ The refrigerant circulation system 100 circulates the refrigerant and performs heat exchange with air in the air conditioning case 160 to perform cooling or heating of the interior of the vehicle.

The coolant loop 200 includes a first heat exchanger, a second heat exchanger, a first coolant line 201, a second coolant line 202 and a first valve system.

The first heat exchanger performs heat exchange with the refrigerant of the refrigerant circulation system (100). The air conditioner for a vehicle increases the temperature of the coolant through the first heat exchanger and is used as a heat source for heating the interior of the vehicle. The second heat exchanger is provided in the air conditioning case (160). A coolant flows inside the second heat exchanger and heats the air passing through it.

The first coolant piping 201 connects the first heat exchanger and the second heat exchanger, and serves as a passage through which the coolant circulates. And a circulation pump 250 for circulating the coolant in the first coolant pipe 201.

The second coolant line 202 is branched at the first coolant line 201 and exchanges heat with the engine 210. The second coolant pipe 202 may be provided with a reservoir tank 225.

The first heat exchanger includes a water-cooled condenser 220, and the second heat exchanger includes a heater core 240. In this case, the heater core 240 is a heat exchanger that uses warm cooling water heat-exchanged with the engine in the air conditioner of the vehicle of the internal combustion engine as a heat source of heat. The vehicle air conditioner according to the first embodiment of the present invention, The vehicle air conditioner can be used in common with the air conditioner for the internal combustion engine.

The first valve system selectively flows the coolant flowing through the first coolant line 201 into the second coolant line 202. The first valve system is comprised of a first directional valve 231 and a second directional valve 232. The first bidirectional valve 231 is disposed on the downstream side of the engine 210 in the flow direction of the coolant and the second bidirectional valve 232 is disposed on the upstream side of the engine 210.

When the first bidirectional valve 231 closes the flow path and the second bidirectional valve 232 opens the flow path, the coolant circulates in turn through the heater core 240 and the water-cooled condenser 220. The coolant flows through the heater core 240, the reservoir tank 225, the engine 210, and the coolant in the case where the first bidirectional valve 231 opens the flow path and the second directional valve 232 closes the flow path. And the water-cooled condenser 220 in this order.

The refrigerant circulation system 100 includes a first refrigerant pipe 101, a second refrigerant pipe 102, and a second valve system.

The first refrigerant pipe 101 includes a compressor 110, a condenser 120, a first expansion means 140, and an evaporator 130 in sequence.

The compressor 110 is composed of an electric compressor driven by electric energy. The compressor 110 sucks and compresses the low-temperature and low-pressure gaseous refrigerant that has passed through the evaporator 130, and discharges the refrigerant toward the condenser 120 in a state of high temperature and high pressure. An accumulator 170 for separating the liquid refrigerant and the gaseous refrigerant from the compressor 110 and supplying only the gaseous refrigerant to the compressor 110 is provided on the upstream side of the compressor 110 in the refrigerant flow direction.

The condenser 120 is provided on the front side of the vehicle and is composed of an air-cooled condenser for condensing the refrigerant by heat exchange with the running wind. That is, the condenser 120 condenses the gaseous refrigerant of high temperature and high pressure discharged from the compressor 110 by heat exchange with the outside air. The condenser 120 may further include a separate blowing means.

The first expansion means (140) rapidly expands the liquid refrigerant discharged from the condenser (120) by the throttling action, and sends the refrigerant to the evaporator (130) in a low-temperature low-pressure humidified state. The first expansion means 140 may be an expansion valve such as an EXV or TXV or an orifice structure.

The evaporator 130 is provided in the air conditioning case 160. The evaporator 130 is disposed upstream of the heater core 240 in the air flow direction. The evaporator 130 evaporates the low-pressure liquid refrigerant discharged from the first expansion means 140 by exchanging the low-pressure liquid refrigerant with air in the air conditioning case 160, thereby cooling the air by an endothermic effect caused by the latent heat of evaporation of the refrigerant.

In the air conditioning case 160, a blower for forming an air flow is provided on the air inlet side. The amount of air passing through the heater core 240 and the amount of air bypassing the heater core 240 are adjusted between the evaporator 130 and the heater core 240 to control the temperature of the air conditioning air discharged into the room A tempo door 135 is provided.

The second refrigerant pipe 102 is branched from the first refrigerant pipe 101 and bypasses the evaporator 130. The second refrigerant pipe 102 is branched between the condenser 120 and the first expansion means 140 and merges between the accumulator 170 and the evaporator 130.

The second valve system controls the flow of refrigerant so that the refrigerant passes or bypasses the evaporator 130. The second valve system may comprise a three way valve 145. The three way valve 145 is provided at a branching point between the first refrigerant pipe 101 and the second refrigerant pipe 102 so as to flow the refrigerant passing through the condenser 120 to the evaporator 130, And controls the flow of the refrigerant to bypass the refrigerant.

The water-cooled condenser 220 is disposed between the compressor 110 and the condenser 120. The second expansion means 150 is provided between the water-cooled condenser 220 and the condenser 120. The second expansion means (150) selectively throttles the refrigerant passing therethrough and may be configured as an orifice integral two-way valve.

That is, a compressor 110, a water-cooled condenser 220, a second expansion means 150, a condenser 120, a first expansion means 140 and an evaporator 130 are sequentially formed in the first refrigerant pipe 101 do.

The vehicle air conditioning system according to the first embodiment of the present invention includes a control unit. The control unit performs various air conditioning modes by operating the flow of the refrigerant, the flow of the coolant, and the door.

The control unit controls the first valve system to circulate the coolant through the engine 210 in the defrost mode or the dehumidification mode. With this configuration, the waste heat of the engine 210 can be used to defrost and dehumidify.

The air conditioner for a vehicle has a sensor for sensing the outside temperature. The controller compares the ambient temperature detected by the sensor with the reference temperature. The control unit circulates the coolant to the engine when the outside air temperature is lower than the reference temperature. In addition, the control unit controls the coolant to bypass the engine when the outside air temperature is higher than the reference temperature.

For example, when the outside air temperature is lower than -20 ° C, the controller determines that the condenser 120, which is an outdoor heat exchanger, is concealed, circulates the coolant to heat exchange with the engine 210, Thereby performing indoor heating. When the outside air temperature is higher than -20 ° C, the control unit bypasses the refrigerant from the engine 210 to circulate the refrigerant, operates the refrigerant circulation system 100, and uses the water-cooled condenser 220 as a heat source. .

3 shows a cooling mode of the automotive air conditioner according to the first embodiment of the present invention.

3, in the cooling mode, the refrigerant is supplied to the compressor 110, the water-cooled condenser 220, the second expansion means 150, the condenser 120, the first expansion means 140, the evaporator 130, (170). In this case, the coolant loop 200 is stopped, the coolant does not undergo heat exchange in the water-cooled condenser 220, passes through the second expansion means 150 without any diagonal action and is condensed in the condenser 120, Is expanded in the expansion means (140), evaporated in the evaporator (130), and returned to the compressor (110).

The tempdoor 135 in the air conditioning case 160 operates to close the flow path to the heater core 240 so as to heat exchange with the evaporator 130 so that the cooled air cools the vehicle interior.

4 shows a heating heat pump mode of the vehicle air conditioning system according to the first embodiment of the present invention.

4, in the heat pump heating mode, the refrigerant circulates through the compressor 110, the water-cooled condenser 220, the second expansion means 150, the condenser 120, and the accumulator 170 in this order. In this case, the coolant circulates through the first coolant piping 201 to the water-cooled condenser 220 and the heater core 240. The refrigerant is heat-exchanged with the coolant in the water-cooled condenser 220 and condensed. The refrigerant is throttled in the second expansion means 150, evaporated in the condenser 120, and returned to the compressor 110.

The TEMP door 135 in the air conditioning case 160 operates to open the flow path to the heater core 240. [ The heater core 240 exchanges heat with the refrigerant discharged from the compressor 110 at a high temperature and a high pressure from the water-cooled condenser 220 to receive the heated coolant, exchanges heat with the air, and the heated air heats the interior of the vehicle.

5 shows a defrosting mode of the automotive air conditioner according to the first embodiment of the present invention.

Referring to FIG. 5, in the defrost mode, the operation of the refrigerant circulation system 100 is stopped. The coolant in the coolant loop 200 sequentially circulates the engine 210, the water-cooled condenser 220, the heater core 240, and the reservoir tank 225. The coolant is heated by the waste heat of the engine 210 while exchanging heat with the engine 210. The coolant is heat-exchanged with air passing through the heater core 240 to be used as a heat source for heating.

6 shows a dehumidification mode of the automotive air conditioner according to the first embodiment of the present invention.

6, in the dehumidification mode, the coolant in the coolant loop 200 circulates through the engine 210, the water-cooled condenser 220, the heater core 240, and the reservoir tank 225 in turn. The coolant is heated by the waste heat of the engine 210 while exchanging heat with the engine 210. The coolant is heat-exchanged with air passing through the heater core 240 to be used as a heat source for heating.

At the same time, the refrigerant in the refrigerant circulation system 100 is supplied to the compressor 110, the water-cooled condenser 220, the second expansion means 150, the condenser 120, the first expansion means 140, the evaporator 130, (170). The refrigerant is heat-exchanged with the coolant in the water-cooled condenser 220 and condensed. The refrigerant passes through the second expansion means 150 without any diaphragm action, is throttled in the first expansion means 140, evaporates in the evaporator 130, Lt; / RTI >

The vehicle air conditioning system according to the first embodiment of the present invention includes a control unit. When the control mode is changed to the engine mode for performing heating using the heat source of the engine 210 in the heat pump mode for performing heating using the heat source of the first heat exchanger, When the temperature reaches the second heat exchanger coolant temperature, the first valve system is controlled to perform the engine mode so that the coolant is circulated to the engine 210 side.

That is, when the vehicle is suddenly changed from the state of performing the heat pump heating mode using the heat source of the water-cooled condenser 220 to the engine running mode for a long time in the EV mode (Electric Vehicle Mode), the heat pump heating mode By maintaining a constant time, the change in discharge temperature can be reduced. Thereafter, the engine coolant temperature rises to be equal to the heater core coolant temperature, and then the engine mode is performed.

When the temperature of the engine coolant rises above the reference value and the mode is changed to the electric vehicle (EV mode) mode, the control unit controls to heat the engine 210 using the latent heat of the engine 210 until the coolant temperature falls below a reference value.

That is, when the coolant temperature is excessively increased due to engine operation for other reasons than the air conditioning load, the control unit performs heating only with the coolant through the latent heat of the engine 210 until the coolant falls to the proper temperature And then performs the heat pump heating mode. Therefore, more efficient operation is possible in terms of fuel economy.

7 shows a vehicle air conditioning system according to a second embodiment of the present invention. Referring to FIG. 7, a low voltage PTC heater 270, which is electrically heated in the air conditioning case 160, may be further provided. In the first embodiment, the PTC heater can be omitted by using the waste heat of the water-cooled condenser 220 and the engine 210 as a heating heat source, thereby reducing the front-rear direction thickness of the vehicle. In the second embodiment, a PTC heater that generates electricity electrically is formed on the downstream side of the heater core 240 in the air flow direction. As described above, since the PTC heater 270 having a comparatively low voltage can be constructed by using the waste heat of the water-cooled condenser 220 and the engine 210 as a heat source for heating, the advantage that the package of the air conditioner can be reduced is still effective .

The vehicle air conditioning system according to the second embodiment of the present invention includes a control unit. In the heating mode, the controller performs heating using the heat source of the first heat exchanger during the preheating of the engine 210, and then uses the heat source of the engine 210 when the engine coolant temperature reaches the second heat exchanger coolant temperature Control to perform heating.

That is, during the initial heating, the heater core 240 is heated using the heat source of the water-cooled condenser 220 of the heat pump system during warm-up of the engine 210, and the heater core 240 and the PTC heater The air passing through the heating plate 270 is heated. Thereafter, when the engine coolant temperature reaches a level similar to the heater core coolant temperature, the coolant flows through the engine 210 to perform the engine heating mode.

8 shows a vehicle air conditioning system according to a third embodiment of the present invention. Referring to FIG. 8, the vehicle air conditioner further includes a third refrigerant pipe 183, a third refrigerant pipe 181, a third expansion means 182, and a chiller 190.

The third refrigerant pipe 183 is branched from the first refrigerant pipe 101 downstream of the branch point of the second refrigerant pipe 102 in the refrigerant flow direction and bypasses the evaporator 130. The third coolant piping 181 is a passage for heat exchange with the battery 180 of the vehicle. A circulation pump (not shown) may be provided to circulate the coolant inside the third coolant pipe 181.

The third expansion means 182 and the chiller 190 are sequentially provided in the third refrigerant pipe 183. The chiller 190 exchanges the coolant of the third coolant pipe 181 with the coolant of the third coolant pipe 183. In this case, the battery 180 is a conceptual term including a battery pack, a battery system, and the like of an electric vehicle. The third inflation means 182 may be configured as a combination of a TXV and a solenoid valve as shown in the figure, or may be configured in a separate form.

A portion of the refrigerant that has passed through the condenser 120 returns to the compressor 110 via the first expansion means 140, the evaporator 130 and the accumulator 170 while the other portion flows along the third refrigerant pipe 183 The refrigerant is returned to the compressor 110 via the third expansion means 182, the chiller 190 and the accumulator 170. The coolant flowing through the third coolant line 181 cools the battery 180 and the heated coolant is cooled by heat exchange with the low temperature coolant passing through the chiller 190.

Further, a vehicle air conditioning system according to a third embodiment of the present invention includes a control unit. The control unit controls the coolant in the third coolant pipe 181 to circulate after first flowing the coolant through the third coolant pipe 183 when the battery 180 needs to be cooled during the cooling mode operation.

When the valve of the third expansion means 182 is opened in a state in which the coolant flows, the TXV of the third expansion means 182 is suddenly opened due to the high cooling load, so that the refrigerant flow noise may be largely generated. The control unit can open the valve first and gradually increase the coolant flow rate of the circulation pump by opening the valve of the third expansion means 182 and then activating the circulation pump of the third coolant pipe 181 to reduce the refrigerant flow noise .

9 shows a vehicle air conditioner according to a fourth embodiment of the present invention. Referring to Fig. 9, the vehicle air conditioning system according to the fourth embodiment has a configuration of the first valve system which is different from the first embodiment described above. That is, the first valve system is configured to selectively pass the coolant circulating through the second heat exchanger to the first heat exchanger and the engine 210. The first coolant piping 201 connects the water-cooled condenser 220 to the heater core 240 and the second coolant piping 202 is branched from the first coolant piping 201 to exchange heat with the engine 210.

More specifically, a three-way valve 255 is provided at a branch point between the first coolant line 201 and the second coolant line 202. The first coolant piping 201 sequentially passes through the circulation pump 250, the three-way valve 255, the water-cooled condenser 220, and the heater core 240 in the coolant flow direction. The second coolant pipe 202 bypasses the water-cooled condenser 220 through the heater core 240, passes through the engine 210, and circulates through the heater core 240. With this configuration, the heater core 240 can selectively use the waste heat of the engine 210 or the refrigerant heat source through the water-cooled condenser 220 as a heating heat source.

Although the vehicle air-conditioning apparatus according to the present invention has been described with reference to the embodiments shown in the drawings, it is to be understood that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. Accordingly, the scope of the true technical protection should be determined by the technical idea of the appended claims.

100: refrigerant circulation system 101: first refrigerant piping
102: second refrigerant piping 110: compressor
120: condenser 130: evaporator
140: first expansion means 145: three-way valve
150: second expansion means 160: air conditioning case
135: Temp door 170: Accumulator
180: Battery 181: Third coolant piping
182: third expansion means 183: third refrigerant piping
190: Chiller 200: Coolant Loop
201: first coolant piping 202: second coolant piping
210: engine 220: water-cooled condenser
225: reservoir tank 231: first one-way valve
232: second defrosting valve 240: heater core
250: Circulating pump 255: Three way valve
270: Low Voltage PTC Heater

Claims (14)

1. A vehicle air conditioning system having a refrigerant circulation system that circulates a refrigerant to perform heat exchange with air in an air conditioning case (160) to perform cooling or heating of the vehicle interior,
And a first heat exchanger for exchanging heat with the refrigerant of the refrigerant circulation system. The temperature of the coolant is increased through the first heat exchanger to be used as a heat source for heating the vehicle interior,
A second heat exchanger provided in the air conditioning case (160) for heating the air passing through the coolant and passing through the coolant;
A first refrigerant pipe (201) which connects the first heat exchanger and the second heat exchanger and through which the coolant circulates;
A second refrigerant pipe (202) branched from the first refrigerant pipe (201) and exchanging heat with the engine (210); And
And a first valve system for selectively flowing coolant flowing through the first coolant pipe (201) to the second coolant pipe (202). The method according to claim 1,
Wherein the first heat exchanger is a water-cooled condenser. The method according to claim 1,
And the second heat exchanger comprises a heater core. The method according to claim 1,
Wherein in the defrost mode or the dehumidification mode, the first valve system is controlled so that the coolant circulates in the engine (210). The method according to claim 1,
A sensor for detecting the outside temperature and a control unit for comparing the outside temperature sensed by the sensor with a reference temperature,
Wherein the controller circulates the coolant to the engine when the outside air temperature is lower than the reference temperature and controls the coolant to bypass the engine when the outside air temperature is higher than the reference temperature. The method according to claim 1,
The refrigerant circulation system comprises:
A first refrigerant pipe (101) in which a compressor (110), a condenser (120), a first expansion means (140) and an evaporator (130) are sequentially formed;
A second refrigerant pipe (102) branched from the first refrigerant pipe (101) and bypassing the evaporator (130); And
And a second valve system for controlling the flow of the refrigerant so that the refrigerant passes through or bypasses the evaporator (130). The method according to claim 6,
The first heat exchanger is disposed between the compressor 110 and the condenser 120 and includes a second expansion means 150 for selectively reducing the refrigerant between the first heat exchanger and the condenser 120, Device. The method according to claim 1,
And a low-voltage PTC heater (270) electrically heated in the air conditioning case (160). The method according to claim 6,
A third refrigerant pipe (183) branched from the first refrigerant pipe (101) downstream of the branch point of the second refrigerant pipe (102) in the refrigerant flow direction and bypassing the evaporator (130);
A third coolant line 181 for heat exchange with a battery 180 of the vehicle; And
A third expansion means 182 and a chiller 190 which are sequentially disposed in the third refrigerant pipe 183 and the chiller 190 is connected to the coolant of the third coolant pipe 181 and the coolant of the third coolant pipe 183) is heat-exchanged. The method according to claim 1,
In the heating mode, heating is performed using the heat source of the first heat exchanger during the preheating of the engine 210. When the engine coolant temperature reaches the second heat exchanger coolant temperature, the heat of the engine 210 is used to heat And a controller for controlling the air conditioner to perform the air conditioning control. The method according to claim 1,
When the engine mode is changed to the heating mode using the heat source of the engine 210 in the heat pump mode for performing heating using the heat source of the first heat exchanger, And a control unit for controlling the first valve system to perform the engine mode so that the coolant is circulated to the engine (210) side when the second heat exchanger coolant temperature is reached. The method according to claim 1,
And a control unit for performing heating by using the latent heat of the engine 210 until the temperature of the coolant drops below a reference value when the engine coolant temperature is changed to an electric vehicle (EV) mode in a state where the temperature of the engine coolant rises above a reference value The air conditioner of the present invention. 10. The method of claim 9,
And a control unit for circulating the coolant in the third coolant pipe (181) after flowing the coolant through the third coolant pipe (183) when the battery (180) needs to be cooled during the cooling mode operation. The method according to claim 1,
Wherein the first valve system comprises:
And the coolant circulating through the second heat exchanger is configured to selectively pass through the first heat exchanger and the engine (210).

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