KR102086379B1 - Air conditioning system for vehicle - Google Patents

Abstract

The present invention is provided on a compressor, an outdoor heat exchanger, an evaporator, a first expansion valve, a second expansion valve, and a refrigerant circulation line to supply refrigerant discharged to an outdoor heat exchanger to a first expansion valve in a cooling mode and in a heating mode. Directional valve for changing the flow direction of the refrigerant so that the refrigerant discharged to the outdoor heat exchanger is supplied to the compressor to use the heat pump system, connected to the cooling water line through which the cooling water of the engine circulates to supply heat source to the cooling water in response to engine operation. A heat source unit and a control unit, wherein the heat source unit comprises a heat supply line, a water pump provided in the heat supply line, a coolant flowing through the heat supply line, and a coolant flowing through the coolant circulation line, thereby supplying a heat source to the coolant. Heat exchanger and switching valve for switching the flow of coolant flowing in and out of the engine to be supplied to the heat supply line Provided that the vehicle air-conditioning system.
Therefore, by supplying a heating heat source in place of the engine can be used to suppress the maximum use of the engine, thereby realizing low fuel consumption, it is possible to suppress the use of the engine for heating to improve the overall efficiency of the vehicle.

Description

Air conditioning system for vehicle

The present invention relates to a vehicle air conditioning system, and more particularly to a vehicle air conditioning system applied to a hybrid vehicle.

In general, as a way to achieve low fuel consumption of the vehicle and reduce the use of the engine, a technology using an electric motor in combination with the engine is applied to a vehicle, which is called a hybrid vehicle. Such a hybrid vehicle is equipped with a battery for driving the electric motor in the vehicle, and can be driven only by the electric motor under certain conditions. By the way, such a hybrid car, only the electric motor Due to the short driving distance, a plug-in hybrid vehicle is being developed to increase the capacity of an electric battery and charge it as a way to compensate for the shortcoming.

On the other hand, the hybrid vehicle described above is difficult to secure proper heating performance because it does not use an engine when driving only with an electric motor, and also has difficulty in securing a heating heat source due to a decrease in the frequency of use of the engine.

Accordingly, the hybrid vehicle is a method for additionally securing a heating heat source, and additionally applies an auxiliary heater for heating by heating electricity to the PTC element, and is applied to the air conditioner of the vehicle. An air conditioning system for HEV and a heating control method using the same have been disclosed.

By the way, in the hybrid vehicle to which the auxiliary heater is additionally applied, although the additional heat source is secured through the auxiliary heater, the heat source for heating is not enough, so the engine must be used to secure the heating heat source. do. In addition, when the outside temperature is lowered, more energy is required for heating, and the energy for heating is increased as the frequency of use of the engine increases due to the waste heat of the engine. This reduces the function of the electric motor driving mode of a hybrid car.

In other words, the plug-in hybrid vehicle of the related art has operated the engine more than necessary to secure sufficient heating heat source, and the engine operation not only deteriorates the basic function of low fuel consumption, but also the use of the engine is an energy source for driving the vehicle. There is a problem in reducing the overall efficiency of the hybrid vehicle because it is used as an energy source for heating.

The present invention is provided with a switching valve at a portion where the cooling water line and the heat supply line respectively meet, and the cooling water flowing in and out of the engine by the opening and closing of the switching valve is selectively supplied to the heat supply line, the cooling water of the engine at the time of operation of the engine It is easy to reach the constant temperature of the coolant circulating in the line, and it is possible to perform the warm-up function so that the coolant temperature of the engine becomes normal at an early stage, thereby maximizing the engine efficiency of the vehicle early and thereby heating up. To provide a vehicle air conditioning system that can secure a heat source for the early stage, can suppress the use of an engine to secure a sufficient heat source for heating in a hybrid vehicle, realize low fuel consumption, and improve the overall efficiency of the hybrid vehicle. There is this.

The present invention, the compressor disposed on the refrigerant circulation line; An outdoor heat exchanger disposed on the refrigerant circulation line and installed outside the air conditioning case to exchange heat between the flowing refrigerant and external air; An evaporator disposed on the refrigerant circulation line between the compressor and the outdoor heat exchanger and installed in the air conditioning case to exchange heat between the refrigerant and indoor air flowing in the air conditioning case; A first expansion valve disposed on the refrigerant circulation line between the outdoor heat exchanger and the evaporator to adjust a flow rate of the refrigerant flowing and to throttle the refrigerant; A second expansion valve disposed on the refrigerant circulation line between the outdoor heat exchanger and the compressor to adjust a flow rate of the refrigerant flowing and to throttle the refrigerant; Is provided on the refrigerant circulation line to supply the refrigerant discharged to the outdoor heat exchanger in the cooling mode to the first expansion valve, the refrigerant discharged to the outdoor heat exchanger to use the heat pump system in the heating mode to the compressor Direction change valve for switching the flow direction of the refrigerant to be supplied; A heat source unit connected to a coolant line through which the coolant of the engine circulates and supplying a heat source to the coolant in response to the engine operation; And a control unit controlling the flow of the refrigerant and the cooling water according to the engine operation by controlling operations of the first expansion valve, the second expansion valve, the direction change valve, and the heat source unit. The unit may include a heat supply line through which both ends are connected to an outlet side and an inlet side of the engine of the cooling water line, through which the cooling water flows, and a water pump provided in the heat supply line to force circulation of the cooling water, and the compressor and the first agent. Coolant refrigerant heat exchanger disposed on the refrigerant circulation line between two expansion valves and connected to the heat supply line to supply heat source to the cooling water by mutually exchanging a refrigerant flowing through the heat supply line and a refrigerant flowing through the refrigerant circulation line. Roof tiles, the cooling water line and the heat supply line are provided at each of the meeting portion, and flows in and out of the engine It includes a switching valve for switching the flow of the coolant to be supplied to the heat supply line, the switch valve is provided in the portion where the outlet side of the engine and the heat supply line of the coolant line meets, and is discharged from the engine A first switching valve for allowing cooling water to be supplied to a heater provided in the air conditioning case, or a closed circuit flowing only to the water pump and the cooling water refrigerant heat exchanger along only the heat supply line, and an inlet side of the engine of the cooling water line; A second switching valve is provided at a portion where the heat supply line meets, such that the coolant supplied to the engine is supplied to the heater or a closed circuit flowing only to the water pump and the coolant refrigerant heat exchanger along the heat supply line. It provides a vehicle air conditioning system.

The heat source unit may further include a surge tank provided in the heat supply line to cope with thermal expansion of the cooling water according to a temperature change.

The heat source unit may include a first water temperature sensor provided at an inlet side of a heater of the heat supply line installed inside the air conditioning case to sense a temperature of the cooling water supplied to the heater and to transmit temperature information of the cooling water to the controller. It further includes, The control unit preferably controls the rotation speed of the compressor in response to the temperature of the cooling water received from the first water temperature sensor.

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In addition, the vehicle air conditioning system further includes a gas-liquid separator provided in the refrigerant circulation line between the evaporator and the compressor.

The vehicle air conditioning system includes a bypass line having both ends connected to the inlet side and the outlet side of the second expansion valve of the refrigerant circulation line so as to bypass the second expansion valve. And a bypass valve configured to adjust a flow rate of the refrigerant flowing through the bypass line, wherein the controller is configured to allow the refrigerant discharged from the cooling water refrigerant heat exchanger to flow along the bypass line in a cooling mode. Preferably, the second expansion valve and the bypass valve are controlled respectively.

In addition, the vehicle air conditioning system is branched at the inlet side of the coolant refrigerant heat exchanger of the heat exchange line and the cooling line flows, the refrigerant line is arranged on the refrigerant circulation line on the compressor inlet side and is connected to the branch line And an auxiliary heat exchanger configured to heat exchange the refrigerant flowing through the refrigerant circulation line and the cooling water flowing through the branch line to increase the superheat degree of the refrigerant supplied to the compressor.

Here, the second water temperature sensor which is provided on the heat supply line at the inlet side of the coolant refrigerant heat exchanger and senses the temperature of the coolant, and transmits the temperature information of the coolant to the controller, the heat supply line and the branch line It is provided in the meeting portion, and further comprises a third switching valve for supplying the cooling water flowing in the heat supply line to the branch line, wherein the control unit, the third corresponding to the cooling water temperature received from the second water temperature sensor It is preferable to control the switching valve to adjust the flow rate of the cooling water flowing to the branch line. In this case, when the temperature of the cooling water is greater than or equal to the first predetermined temperature and less than the second predetermined temperature, the controller controls the third switching valve to allow the cooling water to flow at a constant flow rate to the branch line, and the temperature of the cooling water is equal to the temperature of the cooling water. When the temperature is greater than or equal to the second preset temperature or less than the first preset temperature, the third switching valve is controlled to prevent the cooling water from flowing to the auxiliary heat exchanger.

The air conditioning system for a vehicle according to the present invention provides the following effects.

First, a switch valve is provided at a portion where the coolant line and the heat supply line meet each other, and the coolant flowing in and out of the engine is selectively supplied to the heat supply line by opening and closing the switch valve, so that the coolant line of the engine is opened at the time of operation of the engine. It is possible to easily reach a constant temperature of the circulating coolant, and it is possible to perform the warm-up function so that the coolant temperature of the engine is brought to a steady state early. Can be secured at an early stage, and the heat source for heating can be supplied instead of the engine, thereby restraining the use of the engine as much as possible, thereby realizing low fuel consumption.

Second, the overall efficiency of the vehicle can be improved by suppressing the use of the engine for heating.

1 is a view schematically showing the configuration of a vehicle air conditioning system according to a first embodiment of the present invention.
FIG. 2 is a block diagram illustrating a control flow of a control unit of the vehicle air conditioning system of FIG. 1.
3 is a view schematically showing the configuration of a vehicle air conditioning system according to a second embodiment of the present invention.
4 is a view schematically showing the configuration of a vehicle air conditioning system according to a third embodiment of the present invention.
5 is a view schematically showing the configuration of a vehicle air conditioning system according to a fourth embodiment of the present invention.
6 is a view schematically showing the configuration of a vehicle air conditioning system according to a fifth embodiment of the present invention.
7 is a view schematically showing the configuration of a vehicle air conditioning system according to a sixth embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, referring to FIG. 1, a vehicle air conditioning system 510 according to a first embodiment of the present invention includes a compressor 110, an outdoor heat exchanger 120, an evaporator 130, and a first expansion valve. 141, a second expansion valve 142, a direction switching valve 150, a heat source unit 200, and a controller 400.

The compressor 110 serves to compress the refrigerant flowing in the refrigerant circulation line 100 and receives an signal from the controller 400 to independently change the rotation speed (not shown). ) Is included.

The outdoor heat exchanger 120 is disposed on the refrigerant circulation line 100 and installed in an engine room outside the air conditioning case, and serves to exchange heat between the refrigerant flowing through the refrigerant circulation line 100 and external air. do.

The evaporator 130 is disposed on the refrigerant circulation line 100 between the compressor 110 and the outdoor heat exchanger 120, and is installed in the air conditioning case 10 to provide the refrigerant and the air conditioning case. (10) It plays a role of mutual heat exchange between indoor air flowing inside.

The first expansion valve 141 is disposed on the refrigerant circulation line 100 between the outdoor heat exchanger 120 and the evaporator 130, and flow rate of the refrigerant flowing through the refrigerant circulation line 100. It serves to regulate and throttle the refrigerant.

Here, the compressor 110, the outdoor heat exchanger 120, the evaporator 130, and the first expansion valve 141 constitute a vehicle air conditioner, and include a known compressor, a condenser, an evaporator, and Since it substantially corresponds to the air conditioner configuration of the vehicle consisting of an expansion valve, a detailed description thereof will be omitted.

In addition, the vehicle air conditioning system 510 includes an engine 310 and a coolant line 300 connected to a heater 321 provided in the air conditioning case 10 to circulate coolant. Since the cooling water line 300 is substantially the same as the cooling water line 300 through which the known cooling water circulates, a detailed description thereof will be omitted.

The second expansion valve 142 is disposed on the refrigerant circulation line 100 at the inlet side of the outdoor heat exchanger 120 to adjust the flow rate of the refrigerant flowing through the refrigerant circulation line 100 and It serves to throttle the refrigerant. Here, it is preferable that the first expansion valve 141 and the second expansion valve 142 use an electrically adjustable valve, wherein the first expansion valve 141 is inexpensive, temperature-sensitive expansion. It can also be used as a valve.

The direction switching valve 150 is provided on the refrigerant circulation line 100 so that the refrigerant discharged from the outdoor heat exchanger 120 flows to the first expansion valve 141 or the compressor 110. To switch the flow of, in the cooling mode to the refrigerant discharged to the outdoor heat exchanger 120 is supplied to the first expansion valve 141, in the heating mode to use the heat pump system in the outdoor heat exchanger ( The flow direction of the refrigerant is switched so that the refrigerant discharged to the 120 is supplied to the compressor 110.

Furthermore, the vehicle air conditioning system 510 further includes a gas-liquid separator 140 provided in the refrigerant circulation line 100 between the evaporator 130 and the compressor 110. The gas-liquid separator 140 may separate the refrigerant discharged from the evaporator 130 into gas-liquid separation and supply the gas-liquid separator to the compressor 110. The gas-liquid separator 140 may be a known accumulator.

The heat source unit 200 is connected to the coolant line 300 and serves to supply a heat source to the coolant in response to the operation of the engine 310.

Hereinafter, the heat source unit 200 will be described in detail. The heat source unit 200 includes a heat supply line 210, a water pump 220, a coolant refrigerant heat exchanger 230, and a switching valve 240. Include.

Both ends of the heat supply line 210 are connected to the outlet side and the inlet side of the engine 310 of the cooling water line 300 so that the cooling water flows.

The water pump 220 is provided in the heat supply line 210 serves to circulate the cooling water along the heat supply line 210.

The coolant refrigerant heat exchanger 230 is disposed on the refrigerant circulation line 100 between the compressor 110 and the second expansion valve 142 and is connected to the heat supply line 210. The coolant refrigerant heat exchanger (230) uses a coolant flowing in the heat supply line (210) and a coolant flowing in the coolant circulation line (100) as a heat exchange medium, and exchanges the coolant and the coolant with each other to the coolant. It serves to supply the heat source.

Here, the coolant refrigerant heat exchanger 230 is used to heat exchange the two heat exchange media of the coolant and the refrigerant with each other, and may be variously applied as long as it is capable of mutually exchanging the coolant and the refrigerant such as a known double pipe.

The switching valve 240 is provided at the portions where the coolant line 300 and the heat supply line 210 meet each other, and switches the flow of the coolant flowing in and out of the engine 310 to the heat supply line 210. It serves to be supplied.

In detail, the selector valve 240 includes a first selector valve 241 and a second selector valve 242. The first switch valve 241 is provided at a portion where the coolant line 300 and the heat supply line 210 at the outlet side of the engine 310 meet, and the second switch valve 242 is the engine ( An inlet side of the 310 is provided at a portion where the cooling water line 300 and the heat supply line 210 meet.

The first switching valve 241 and the second switching valve 242 is a heater provided in the air conditioning case 10 to the cooling water discharged from the engine 310 in accordance with the control signal of the control unit 400 The circuit circulates back to the engine 310 after passing through 321, or the cooling water is circulated to the heat supply line 210 without passing through the engine 310.

Therefore, the first switch valve 241 and the second switch valve 242, the coolant is the water pump 220, the coolant refrigerant heat exchanger 230, the first switch valve 241, the heater 321 and It is to be circulated in a closed loop along the second switching valve (242).

Here, the first switching valve 241 and the second switching valve 242 has a structure having one inlet and two outlets, and control according to the electrical signal, but selectively control the two outlets Or the flow rate of the cooling water can be selectively distributed to the two outlets.

That is, the switching valve 240, the cooling water line of the engine 310 at the time when the engine 310 operates due to the operation of the first switching valve 241 and the second switching valve 242 ( It can be easily to reach a predetermined temperature of the cooling water circulating 300, and it is possible to perform the warm-up function to make the cooling water temperature of the engine 310 to a normal state early, as well as to improve the engine efficiency of the vehicle early Maximize and secure early sources of heat for heating.

On the other hand, the heat source unit 200, the heat supply line 210 is provided with a surge tank 260. The surge tank 260 is provided on the heat supply line 210, and serves to correspond to the thermal expansion of the cooling water according to the temperature change.

In the figure, the surge tank 260 is shown in the embodiment provided on the heat supply line 210 on the inlet side of the water pump 220, which is a preferred embodiment the installation position is the heat supply line 210 It can be variously changed on the), and can also be used in parallel with the surge tank provided on the cooling water line (300).

Furthermore, the heat source part 200 further includes a first water temperature sensor 251. The first water temperature sensor 251 is a means for determining whether proper heating energy is secured in the heat source unit 200, and an inlet side of the heater 321 installed in the air conditioning case 10, that is, the coolant refrigerant. It is provided on the heat supply line 210 at the outlet side of the heat exchanger 230 to sense the temperature of the coolant supplied to the heater 321 and transmit the detected temperature information of the coolant to the controller 400. do.

In this case, the controller 400 controls the rotation speed of the compressor 110 by comparing the measured coolant temperature with a target coolant temperature based on the temperature information of the coolant received from the first water temperature sensor 251.

According to the above, the vehicle air conditioning system 510 according to the first embodiment, the compressor 110 in the heating mode, the coolant refrigerant heat exchanger 230, the second expansion valve 142, the outdoor heat exchanger ( 120, the direction change valve 150, the gas-liquid separator 140, and the compressor 110 in order to flow. At this time, the second expansion valve 142 is appropriate to the opening amount according to the control signal of the control unit 400 to achieve the energy absorption process while the outside air and the refrigerant exchange heat in the outdoor heat exchanger (120). Is adjusted. In addition, the direction switching valve 150 switches the flow direction of the refrigerant so that the refrigerant flows into the compressor 110 through the gas-liquid separator 140.

On the other hand, in the cooling mode, the vehicle air conditioning system 510 includes the compressor 110, the coolant refrigerant heat exchanger 230, the second expansion valve 142, the outdoor heat exchanger 120, and the directional valve 150. The refrigerant flows in the order of the first expansion valve 141, the evaporator 130, the gas-liquid separator 140, and the compressor 110. In this case, the second expansion valve 142 is controlled to be large enough to minimize the resistance to the refrigerant flow by the control unit 400, the direction switching valve 150 is the first expansion valve 141 Switch to flow refrigerant.

Meanwhile, reference numeral 20 denotes a blower provided at the inlet of the air conditioning case 10, 322 denotes an auxiliary heater provided at the rear of the heater 321, and 330 denotes a radiator.

Referring to FIG. 2, the control unit 400 receives temperature information of cooling water from the first water temperature sensor 251 and the second water temperature sensor 252 which will be described later, and the first expansion valve 141 and the By controlling the operation of the second expansion valve 142, the direction switching valve 150, and the heat source unit 200, it serves to control the flow of the refrigerant and the cooling water according to the operation of the engine 310. do.

3 is a view illustrating a configuration of a vehicle air conditioning system 520 according to a second embodiment, wherein the vehicle air conditioning system 520 according to the second embodiment flows into the outdoor heat exchanger 120 in a cooling mode. By bypassing the refrigerant to pass through the second expansion valve 142, it is possible to prevent the compressor 110 from doing more compression work due to the pressure rise due to the second expansion valve 142 having a small flow path. Can be.

The vehicle air conditioning system 520 according to the second embodiment further includes a bypass line 101 and a bypass valve 102 in the vehicle air conditioning system 510 according to the first embodiment.

Both ends of the bypass line 101 are connected to the refrigerant circulation line 100 at the inlet side and the outlet side of the second expansion valve 142 so as to bypass the second expansion valve 142. Is supposed to flow.

The bypass valve 102 is provided on the bypass line 101 to adjust the flow rate of the refrigerant flowing through the bypass line 101 and to be applied as an on / off valve. can do.

Thus, the controller 400 controls the second expansion valve 142 and the bypass valve 102 in the cooling mode, so that the refrigerant discharged from the coolant refrigerant heat exchanger 230 is bypassed. Flow along (101). Then, the vehicle air conditioning system 520, in the cooling mode, the compressor 110, the coolant refrigerant heat exchanger 230, the bypass valve 102, the outdoor heat exchanger 120, the directional valve 150, The refrigerant flows in the order of the first expansion valve 141, the evaporator 130, the gas-liquid separator 140, and the compressor 110.

4 is a view showing the configuration of a vehicle air conditioning system 530 according to a third embodiment. Referring to the drawings, the vehicle air conditioning system 530 according to the third embodiment of the present invention has a refrigerant in the cooling mode of the gas-liquid separator. It is intended to bypass 140. In this case, the vehicle air conditioning system 530 may reduce the pressure loss amount of the refrigerant generated while passing through the gas-liquid separator 140, thereby reducing the compression work input to the compressor 110 and improving efficiency. Can be improved.

To this end, the vehicle air conditioning system 530 according to the third embodiment, one end is connected to the evaporator 130 and the other end is the refrigerant circulation line between the gas-liquid separator 140 and the compressor 110. And a gas-liquid separator 140 bypass passage 103 connected to the 100 to allow the refrigerant discharged from the evaporator 130 to flow directly to the compressor 110.

As described above, the vehicle air conditioning system 530 according to the third embodiment includes the compressor 110, the coolant refrigerant heat exchanger 230, the second expansion valve 142, and an outdoor heat exchanger in a cooling mode. 120, the direction switching valve 150, the first expansion valve 141, the evaporator 130 and the compressor 110 in order to flow.

5 is a view showing the configuration of a vehicle air conditioning system according to a fourth embodiment, referring to the drawings, the vehicle air conditioning system 540 according to the fourth embodiment, the superheat of the refrigerant supplied to the compressor 110 The branch line 270 and the auxiliary heat exchanger 272 are included to increase the degree. The branch line 270 is branched at the inlet side of the coolant refrigerant heat exchanger 230 of the heat supply line 210 to flow the coolant.

The auxiliary heat exchanger 272 is disposed on the refrigerant circulation line 100 at the inlet side of the compressor 110 and connected to the branch line 270, and a refrigerant flowing through the refrigerant circulation line 100. By exchanging the cooling water flowing in the branch line 270 with each other, it serves to increase the superheat degree of the refrigerant supplied to the compressor (110).

Accordingly, the vehicle air conditioning system 540 according to the fourth embodiment performs heating of the heat supply line 210 with the refrigerant supplied to the compressor 110 through the auxiliary heat exchanger 272. By increasing the superheat degree of the refrigerant by mutual heat exchange with the cooling water of the heat, while ensuring the reliability of the compressor 110, while increasing the circulation amount of the refrigerant can further maximize the heating performance.

6 is a view showing the configuration of a vehicle air conditioning system 550 according to a fifth embodiment. Referring to the drawings, the vehicle air conditioning system 550 corresponds to a coolant temperature of the heat supply line 210. As a structure for flowing or bypassing a predetermined amount to the auxiliary heat exchanger 272, the second water temperature sensor 252 and the third switching valve (243).

The second water temperature sensor 252 is provided on the heat supply line 210 at the inlet side of the coolant refrigerant heat exchanger 230 to sense the temperature of the coolant, and the temperature information of the coolant to the controller 400. It is responsible for transmitting.

The third switching valve 243 is provided at a portion where the heat supply line 210 and the branch line 270 meet, and the flow of the cooling water to the heat supply line 210 and the branch line 270 according to the operation By selectively adjusting, coolant is selectively supplied to the coolant refrigerant heat exchanger 230 and the auxiliary heat exchanger 272.

That is, at this time, the control unit 400 controls the third switching valve 243 in response to the coolant temperature received from the second water temperature sensor 252, the heat supply line 210 and the branch line 270. Select the flow flow to the, and controls the third switching valve (243) to adjust the flow rate of the cooling water flowing to the branch line (270).

In detail, when the temperature of the cooling water is greater than or equal to the first set temperature T1 and less than the second set temperature T2, the controller 400 controls the third selector valve 243 to control the branch line ( 270) allows the cooling water to flow at a constant flow rate.

On the other hand, when the temperature of the cooling water is greater than or equal to the second set temperature T2 or less than the first set temperature T1, the controller 400 controls the third switching valve 243 to control the auxiliary heat exchanger. Do not allow the coolant to flow to (272).

On the other hand, the second set temperature (T2) is higher than the first set temperature (T1) (T1 <T2), wherein the first set temperature (T1) is determined at approximately the outside air temperature level (outside air temperature? Α). . This is because when the refrigerant is heated by the heat supplied from the outside air in the outdoor heat exchanger 120 during heating, when the auxiliary heat exchanger 272 is provided to the auxiliary heat exchanger 272 at a temperature lower than the ambient temperature. The reason why the cooling water flows is because the refrigerant passing through the outdoor heat exchanger 120 flows to the auxiliary heat exchanger 272, which is not efficient.

The second set temperature T2 is determined at the compressor 110 limit temperature level (compressor limit temperature wh β) determined by the compressor 110 manufacturer. This is related to the cooling of the inverter included in the compressor 110 for the variable speed of the compressor 110, and the refrigerant heat exchanged with the coolant exceeding the second set temperature T2 inhibits the cooling of the inverter to prevent the compressor ( 110 may reach an area that no longer works. Therefore, in order to prevent such a problem from occurring, the controller 400 needs to block heat exchange between the coolant and the coolant above the second set temperature T2.

That is, the vehicle air conditioner system 550 according to the fifth embodiment corresponds to the second water temperature sensor 252 and the specific temperature of the coolant to measure the temperature of the coolant returned from the heater 321. The third switching valve (243) capable of switching the flow, so that the coolant flows to the auxiliary heat exchanger 272 or bypass the auxiliary heat exchanger (272) according to the temperature of the set cooling water. .

On the other hand, the vehicle air conditioning system (510, 520, 530, 540, 550) described above is a structure in which the heat source unit 200 supplies a heat source to the cooling water using a heat pump system. Hereinafter, an embodiment of supplying a heat source directly to the cooling water without using a heat pump system will be described.

FIG. 7 is a diagram illustrating a configuration of a vehicle air conditioning system 560 according to a sixth embodiment. Referring to the drawings, the vehicle air conditioning system 560 includes the heat supply line 210 and the water pump 220. ), The first water temperature sensor 251, the first switch valve 241, the second switch valve 242, and a heat supply unit 232.

Here, the heat supply line 210, the water pump 220, the first water temperature sensor 251, the first switch valve 241, a series of including the second switch valve 242 Since the configuration is the same as the configuration of the heat source unit 200 described above, the heat supply unit 232 that will be roughly described will be described.

The heat supply unit 232 is provided on the heat supply line 210, and serves to supply heat to the cooling water flowing along the heat supply line 210. The heat supply unit 232 may be a PTC heater that generates heat through electrical energy, such as a PTC element, and supplies heat to the cooling water. However, this is a preferred embodiment, the heat supply unit 232, if the heat can be supplied to the cooling device such as a boiler heater (FOH) of course can be applied.

Accordingly, the vehicle air conditioning system 560 according to the sixth embodiment includes the second switching valve 242, the water pump 220, the heat supply unit 232, the first water temperature sensor 251, and the heating mode. The coolant moves in the order of the first selector valve 241, the heater 321, and the second selector valve 242.

As described above, the vehicle air conditioning system 510, 520, 530, 540, 550, 560 may suppress the use of the engine 310 by supplying a heating heat source by the heat source unit 200 instead of the engine 310 at the time of the engine 310. In this way, the fuel economy can be improved and the overall efficiency of the vehicle can be improved.

Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

100 ... Refrigerant circulation line 101 ... Bypass line
102 ... Bypass valve 103 ... Gas-liquid separator bypass flow path
110 ... Compressor 120 ... Outdoor Heat Exchanger
130 ... evaporator 140 ... gas-liquid separator
141 ... 1st expansion valve 142 ... 2nd expansion valve
150 ... directional valve 200 ... heat source
210 ... Heat supply line 220 ... Water pump
230 ... Coolant refrigerant heat exchanger 232 ... Heat supply
240 ... selector valve 241 ... first selector valve
242 ... 2nd switching valve 243 ... 3rd switching valve
251 ... first water temperature sensor 252 ... second water temperature sensor
260 ... surge tank 270 ... branch line
272 ... Auxiliary heat exchanger 300 ... cooling water line
310 ... engine 321 ... heater
322 ... auxiliary heater 330 ... radiator
400 ... control unit
510,520,530,540,550,560 ... Automotive Air Conditioning System

Claims (9)

A compressor disposed on a refrigerant circulation line;
An outdoor heat exchanger disposed on the refrigerant circulation line and installed outside the air conditioning case to exchange heat between the flowing refrigerant and external air;
An evaporator disposed on the refrigerant circulation line between the compressor and the outdoor heat exchanger and installed in the air conditioning case to exchange heat between the refrigerant and indoor air flowing in the air conditioning case;
A first expansion valve disposed on the refrigerant circulation line between the outdoor heat exchanger and the evaporator to adjust a flow rate of the refrigerant flowing and to throttle the refrigerant;
A second expansion valve disposed on the refrigerant circulation line between the outdoor heat exchanger and the compressor to adjust a flow rate of the refrigerant flowing and to throttle the refrigerant;
The refrigerant flow is provided on the refrigerant circulation line to supply the refrigerant discharged to the outdoor heat exchanger to the first expansion valve in the cooling mode and to supply the refrigerant discharged to the outdoor heat exchanger to the compressor in the heating mode. Directional valve for switching direction;
A heat source unit connected to a coolant line through which the coolant of the engine circulates and supplying a heat source to the coolant in response to the operation of the engine; And
And a control unit controlling the flow of the coolant and the coolant according to the engine operation by controlling operations of the first expansion valve, the second expansion valve, the direction change valve, and the heat source unit,
The heat source unit,
A heat supply line having both ends connected to each of an outlet side and an inlet side of the engine of the cooling water line, through which the cooling water flows;
A water pump provided in the heat supply line to circulate the cooling water forcibly;
Disposed on the refrigerant circulation line between the compressor and the second expansion valve and connected to the heat supply line to exchange heat between the cooling water flowing through the heat supply line and the refrigerant flowing through the refrigerant circulation line, thereby providing a heat source to the cooling water. Cooling water refrigerant heat exchanger and supply,
And a switching valve provided at portions where the coolant line and the heat supply line meet each other to switch the flow of the coolant flowing in and out of the engine to be supplied to the heat supply line.
The switching valve,
It is provided at a portion where the outlet side of the engine and the heat supply line of the coolant line meets, so that the coolant discharged from the engine is supplied to a heater provided in the air conditioning case, or along the heat supply line only water pump and coolant refrigerant A first switching valve to be a closed circuit flowing only to the heat exchanger;
It is provided at a portion where the inlet side of the engine and the heat supply line of the coolant line meets, so that the coolant supplied to the engine is supplied to the heater, or flows only along the heat supply line to the water pump and the coolant refrigerant heat exchanger A vehicle air conditioning system comprising a second switching valve to be a closed circuit. The method according to claim 1,
The heat source unit,
And a surge tank provided in the heat supply line to cope with thermal expansion of the cooling water according to a temperature change. The method according to claim 1,
The heat source unit,
A first water temperature sensor provided on the heat supply line and configured to sense a temperature of the coolant flowing through the heat supply line and transmit temperature information of the coolant to the controller;
The control unit is a vehicle air conditioning system for controlling the rotation speed of the compressor in response to the temperature of the cooling water received from the first water temperature sensor. delete The method according to claim 1,
And a gas-liquid separator provided on the refrigerant circulation line between the evaporator and the compressor. The method according to claim 1,
A bypass line having both ends connected to an inlet side and an outlet side of the second expansion valve of the refrigerant circulation line to bypass the second expansion valve;
A bypass valve provided on the bypass line to adjust a flow rate of the refrigerant flowing through the bypass line;
The control unit, the vehicle air conditioning system for controlling the second expansion valve and the bypass valve respectively so that the refrigerant discharged from the coolant refrigerant heat exchanger flows along the bypass line. The method according to claim 1,
A branching line branched from the heat supply line and flowing the cooling water;
And an auxiliary heat exchanger disposed on the refrigerant circulation line at the compressor inlet side and connected to the branching line to mutually heat-exchange the refrigerant flowing through the refrigerant circulation line and the cooling water flowing through the branching line. . The method according to claim 7,
A second water temperature sensor provided on the heat supply line and configured to sense a temperature of the coolant flowing through the heat supply line and transmit temperature information of the coolant to the controller;
And a third switching valve provided at a portion where the heat supply line and the branch line meet to selectively supply the cooling water to the heat supply line and the branch line.
The control unit,
And an air conditioning system for controlling the flow rate of the coolant flowing to the branch line by controlling the third switching valve in response to the coolant temperature received from the second water temperature sensor. The method according to claim 8,
The control unit,
The temperature of the cooling water is equal to or greater than a first set temperature; When the temperature is less than the second preset temperature, the third switching valve is controlled to allow the cooling water to flow at a predetermined flow rate to the branch line.
And controlling the third switching valve to prevent the cooling water from flowing to the auxiliary heat exchanger when the temperature of the cooling water is greater than or equal to the second preset temperature or less than the first preset temperature.

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