CN109720165B - Heat pump system for vehicle - Google Patents
Heat pump system for vehicle Download PDFInfo
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- CN109720165B CN109720165B CN201811256930.8A CN201811256930A CN109720165B CN 109720165 B CN109720165 B CN 109720165B CN 201811256930 A CN201811256930 A CN 201811256930A CN 109720165 B CN109720165 B CN 109720165B
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- refrigerant
- heat exchanger
- cooling water
- circulation line
- temperature value
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00814—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
- B60H1/00878—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices
- B60H1/00899—Controlling the flow of liquid in a heat pump system
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00271—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit
- B60H1/00278—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit for the battery
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00735—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models
- B60H1/00807—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models the input being a specific way of measuring or calculating an air or coolant temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/02—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant
- B60H1/14—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant otherwise than from cooling liquid of the plant, e.g. heat from the grease oil, the brakes, the transmission unit
- B60H1/143—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant otherwise than from cooling liquid of the plant, e.g. heat from the grease oil, the brakes, the transmission unit the heat being derived from cooling an electric component, e.g. electric motors, electric circuits, fuel cells or batteries
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air-Conditioning For Vehicles (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
The present invention relates to a heat pump system for a vehicle and a control method thereof, and provides a control method of a heat pump system for a vehicle, the method comprising: a cooling water temperature sensor provided in the cooling water circulation line, a refrigerant temperature sensor provided on the outlet side of the outdoor heat exchanger, and an outside air temperature sensor for sensing the temperature of the air outside the vehicle may be provided, and the control unit may compare the temperature sensors, grasp the condition of the heat source of the cooling water, and determine the bypass of the outdoor heat exchanger based on the grasped condition.
Description
Technical Field
The present invention relates to a heat pump system for a vehicle and a control method thereof, and more particularly, to a heat pump system for a vehicle and a control method thereof, which can prevent a pressure loss of a refrigerant occurring in an outdoor heat exchanger and recover only a heat source of cooling water, thereby achieving a stable heat pump operation.
Background
A vehicle air conditioner is generally configured to include a cooling system for cooling a vehicle interior and a heating system for heating the vehicle interior. The refrigeration system is configured to: exchanging heat between air passing through the outside of the evaporator and a refrigerant flowing inside the evaporator on the evaporator side of the refrigerant cycle, thereby replacing the air with cold air and further cooling the vehicle interior; the heating system is configured to: on the heater core side where the cooling water circulates, the air outside the heater core and the cooling water flowing inside the heater core are heat-exchanged with warm air, and the vehicle interior is heated.
In addition, unlike the vehicle air conditioner as described above, a heat pump system is employed in which the flow direction of the refrigerant is switched by one refrigeration cycle so that cooling and heating can be selectively performed, and for example, two heat exchangers (i.e., an indoor heat exchanger provided inside an air conditioning case for exchanging heat with air blown into the room and an outdoor heat exchanger for exchanging heat outside the air conditioning case) and a direction adjustment valve for switching the flow direction of the refrigerant are provided. Therefore, in the case of operating the cooling mode by the flow direction of the refrigerant through the direction adjustment valve, the indoor heat exchanger performs the function of the cooling heat exchanger, and in the case of operating the heating mode, the indoor heat exchanger performs the function of the heating heat exchanger.
As such a vehicle system, various types are proposed, and a representative example thereof is shown in fig. 1.
The heat pump system for a vehicle shown in fig. 1 includes: a compressor 30 for compressing and discharging a refrigerant; an indoor heat exchanger 32 for releasing heat from the refrigerant discharged from the compressor 30; a first expansion valve 34 and a first bypass valve 36 disposed in a parallel configuration to selectively pass the refrigerant passing through the indoor heat exchanger 32; an outdoor heat exchanger 48 for heat-exchanging the refrigerant passing through the first expansion valve 34 or the first bypass valve 36 outdoors; an evaporator 60 that evaporates the refrigerant passing through the outdoor heat exchanger 48; an Accumulator (Accumulator)62 that separates the refrigerant passing through the evaporator 60 into gaseous and liquid refrigerants; an internal heat exchanger 50 for exchanging heat between the refrigerant supplied to the evaporator 60 and the refrigerant returned to the compressor 30; a second expansion valve 56 selectively expanding the refrigerant supplied to the evaporator 60; and a second bypass valve 58 disposed in parallel with the second expansion valve 56 to selectively connect an outlet side of the outdoor heat exchanger 48 and an inlet side of the accumulator 62.
In fig. 1, reference numeral 10 denotes an air conditioning case in which the indoor heat exchanger 32 and the evaporator 60 are built; reference numeral 12 denotes a temperature-adjusting door for adjusting a mixed amount of cool air and warm air; reference numeral 20 denotes a blower provided at an inlet of the air-conditioning case.
According to the conventional heat pump system for a vehicle configured as described above, when the heat pump mode (heating mode) is operated, the first bypass valve 36 and the second expansion valve 56 are closed, and the first expansion valve 34 and the second bypass valve 58 are opened. The operation of the temperature adjustment door 12 is as shown in fig. 1. Therefore, the refrigerant discharged from the compressor 30 passes through the indoor heat exchanger 32, the first expansion valve 34, the outdoor heat exchanger 48, the high pressure portion 52 of the internal heat exchanger 50, the second bypass valve 58, the accumulator 62, and the low pressure portion 54 of the internal heat exchanger 50 in this order, and then returns to the compressor 30. That is, the indoor heat exchanger 32 is shown to function as a heater, and the outdoor heat exchanger 48 is shown to function as an evaporator.
In the case of operating the air-conditioning mode (cooling mode), the first bypass valve 36 and the second expansion valve 56 are opened, and the first expansion valve 34 and the second bypass valve 58 are closed. The temperature-adjusting door 12 closes the passage of the indoor heat exchanger 32. Therefore, the refrigerant discharged from the compressor 30 passes through the indoor heat exchanger 32, the first bypass valve 36, the outdoor heat exchanger 48, the high pressure portion 52 of the internal heat exchanger 50, the second expansion valve 56, the evaporator 60, the accumulator 62, and the low pressure portion 54 of the internal heat exchanger 50 in this order, and is returned to the compressor 30. That is, the evaporator 60 functions as an evaporator, and the indoor heat exchanger 32 closed by the temperature-adjusting door 12 functions as a heater as in the heat pump mode.
However, in the conventional heat pump system for a vehicle, in the heat pump mode (heating mode), the indoor heat exchanger 32 provided inside the air-conditioning case 10 functions as a heater to perform heating, and the outdoor heat exchanger 48 is provided outside the air-conditioning case 10, that is, the evaporator that exchanges heat with the outside air is operated on the front side of the engine room of the vehicle, however, in this case, in the case where the temperature of the refrigerant flowing into the outdoor heat exchanger 48 is higher than the temperature of the outside air, in other words, in the case where the temperature of the outside air is lower than that of the refrigerant, it is apparent that heat cannot be absorbed from the outside air (heat absorption), in addition, since the heat exchange efficiency of the outdoor heat exchanger 48 is also reduced, such as frost formation in the outdoor heat exchanger 48, there is a problem that the heating performance and efficiency of the heat pump system are reduced.
In order to solve the above-described problems, a heat pump system for a vehicle, which is disclosed in patent publication No. 10-2012-0103054 previously filed by the applicant of the present invention, is briefly described below with reference to fig. 2. The heat pump system for a vehicle includes: a compressor 70 provided in the refrigerant circulation line 91 to compress and discharge the refrigerant; an indoor heat exchanger 71 provided inside an air conditioning case 80 and connected to an outlet-side refrigerant circulation line 91 of the compressor 70 to exchange heat between air flowing inside the air conditioning case 80 and refrigerant discharged from the compressor 70; an evaporator 75 provided inside the air-conditioning case 80 and connected to an inlet-side refrigerant circulation line 91 of the compressor 70 to heat-exchange air flowing inside the air-conditioning case 80 and refrigerant supplied to the compressor 70; an outdoor heat exchanger 73 disposed outside the air conditioning case 80 to exchange heat between the refrigerant circulating through the refrigerant circulation line 91 and outdoor air; a first expansion unit 72 provided on an inlet-side refrigerant circulation line 91 of the outdoor heat exchanger 73 so as to selectively expand the refrigerant supplied to the outdoor heat exchanger 73 according to an air-conditioning mode or a heat pump mode; a second expansion unit 74 provided on an inlet-side refrigerant circulation line 91 of the evaporator 75 so as to expand the refrigerant supplied to the evaporator 75; a first bypass line 92 provided to connect the inlet side refrigerant circulation line 91 of the second expansion unit 74 and the outlet side refrigerant circulation line of the evaporator 75, thereby bypassing the circulating refrigerant through the second expansion unit 74 and the evaporator 75; and a first direction switching valve 90 provided at a diverging point of the first bypass line 92 and the refrigerant circulation line 91 to switch a refrigerant flow direction according to an air conditioning mode or a heat pump mode such that the refrigerant passing through the outdoor heat exchanger 73 flows to the first bypass line 92 or the second expansion unit 74.
In the heat pump mode, in order to dehumidify the vehicle interior, a dehumidification line 94 is provided which connects the first bypass line 92 to the refrigerant circulation line 91 on the inlet side of the evaporator 75 so that a part of the refrigerant flowing through the first bypass line 92 flows toward the evaporator 75, and an open/close valve 94a is provided in the dehumidification line 94. And, a second bypass line 92 is provided to bypass the refrigerant passing through the first expansion unit 72.
Therefore, since the refrigerant bypasses the outdoor heat exchanger 73 through the second bypass line 93 when the outdoor temperature is zero or when the outdoor heat exchanger 73 is frosted, the waste heat of the electric devices can be recovered by the heat supply unit 76 while minimizing the influence of the low-temperature outdoor air, and the flexible operation and heating performance of the heat pump system can be improved.
In the heat pump mode, if dehumidification of the vehicle interior is required, the open/close valve 94a of the dehumidification line 94 is opened, and the refrigerant expanded in the first expansion unit 72 flows through the outdoor heat exchanger 73 to the first bypass line 92, and at this time, a part of the refrigerant flowing through the first bypass line 92 is branched to the dehumidification line 94 and supplied to the evaporator 75 side, whereby dehumidification of the vehicle interior can be achieved.
However, the conventional heat pump system for a vehicle has a problem that the outdoor temperature is below zero, or a simple method of simply comparing the refrigerant temperature and the outdoor temperature on the side of the outdoor heat exchanger 73 and bypassing the refrigerant through the outdoor heat exchanger 73 is simply used, and thus various situations of the heat pump system cannot be satisfied, and thus a failure or performance degradation occurs.
Disclosure of Invention
Therefore, in order to solve the above-described problems, an object of the present invention is to provide a control method of a heat pump system for a vehicle, the method including: a cooling water temperature sensor provided in the cooling water circulation line, a refrigerant temperature sensor provided on the outlet side of the outdoor heat exchanger, and an outside air temperature sensor for sensing the temperature of the air outside the vehicle may be provided, and the control unit may compare the temperature sensors, grasp the condition of the heat source of the cooling water, and determine the bypass of the outdoor heat exchanger based on the grasped condition.
In order to achieve the above object, there is provided a heat pump system for a vehicle, comprising: a compressor which is provided on a refrigerant circulation line and compresses and discharges a refrigerant; an indoor heat exchanger disposed inside an air conditioner case and exchanging heat between air inside the air conditioner case and air discharged from the compressor; an evaporator provided inside the air-conditioning case and heat-exchanging air inside the air-conditioning case with the refrigerant supplied to the compressor; an outdoor heat exchanger disposed outside the air conditioning case and configured to exchange heat between the refrigerant circulating through the refrigerant circulation line and outside air; a first expansion unit disposed on a refrigerant circulation line between the indoor heat exchanger and the outdoor heat exchanger and expanding a refrigerant; a second expansion unit disposed on an inlet-side refrigerant circulation line of the evaporator and expanding the refrigerant; a first bypass line provided to connect an inlet-side refrigerant circulation line of the second expansion unit and an outlet-side refrigerant circulation line of the evaporator and bypass refrigerant through the second expansion unit and the evaporator; a second bypass line provided to connect the outlet-side refrigerant circulation line of the first expansion unit and the outlet-side refrigerant circulation line of the outdoor heat exchanger and bypass refrigerant through the outdoor heat exchanger; a cooling water temperature sensor provided in the cooling water circulation line; a refrigerant temperature sensor disposed at an outlet side of the outdoor heat exchanger; an outside air temperature sensor that senses an air temperature outside the vehicle; and a control part which compares temperature values sensed by the cooling water temperature sensor, the refrigerant temperature sensor and the outside air temperature sensor and judges whether the refrigerant is bypassed through the outdoor heat exchanger by passing through the first bypass line.
And, the control section may perform control such that: and when the cooling water temperature value and the external air temperature value are compared and the difference between the cooling water temperature value and the external air temperature value is judged to be less than a first preset temperature, the existing logic operation is carried out.
And, the control section may perform control such that: and under the condition that the cooling water temperature value and the external air temperature value are compared and the difference between the cooling water temperature value and the external air temperature value is judged to be greater than or equal to a first preset temperature, judging whether the difference between the refrigerant temperature value and the external air temperature value is less than a second preset temperature, if so, operating according to the existing logic, and if so, controlling a second direction conversion valve to bypass the outdoor heat exchanger.
And, the control section may perform control such that: and under the condition that the cooling water temperature value and the external air temperature value are compared and the difference between the cooling water temperature value and the external air temperature value is judged to be greater than or equal to a first preset temperature, judging whether the difference between the refrigerant temperature value and the external air temperature value is less than a second preset temperature or not, if the difference is judged to be less than the second preset temperature, operating by using the existing logic, and if the difference is judged to be greater than or equal to the second preset temperature, controlling a second direction switching valve to bypass the outdoor heat exchanger, then, if the difference is judged to be less than a third preset temperature, keeping the bypass to pass through the outdoor heat exchanger, and if the difference is judged to be greater than or equal to the third preset temperature, operating by using the existing logic.
In order to achieve the above object, the present invention provides a control method of a heat pump system for a vehicle, wherein the heat pump system for a vehicle includes: a compressor which is provided on a refrigerant circulation line and compresses and discharges a refrigerant; an indoor heat exchanger disposed inside an air conditioning case and exchanging heat between air inside the air conditioning case and air discharged from the compressor; an evaporator provided inside the air-conditioning case and heat-exchanging air inside the air-conditioning case with the refrigerant supplied to the compressor; an outdoor heat exchanger disposed outside the air conditioning case and configured to exchange heat between the refrigerant circulating through the refrigerant circulation line and outside air; a first expansion unit disposed on a refrigerant circulation line between the indoor heat exchanger and the outdoor heat exchanger and expanding a refrigerant; a second expansion unit disposed on an inlet-side refrigerant circulation line of the evaporator and expanding the refrigerant; a first bypass line provided to connect an inlet-side refrigerant circulation line of the second expansion unit and an outlet-side refrigerant circulation line of the evaporator and bypass refrigerant through the second expansion unit and the evaporator; a second bypass line provided to connect the outlet-side refrigerant circulation line of the first expansion unit and the outlet-side refrigerant circulation line of the outdoor heat exchanger and bypass refrigerant through the outdoor heat exchanger; a cooling water temperature sensor which is arranged on the cooling water circulation line and measures the temperature value of the cooling water; a refrigerant temperature sensor disposed at an outlet side of the outdoor heat exchanger and measuring a refrigerant temperature value; an outside air temperature sensor sensing an air temperature outside the vehicle to measure an outside temperature value, wherein the control method of the heat pump system for the vehicle includes the steps of: step 1, comparing the cooling water temperature value with the external air temperature value, and if the difference between the cooling water temperature value and the external air temperature value is judged to be less than a first preset temperature, operating according to the existing logic; step 2, if the difference between the refrigerant temperature value and the external air temperature value is smaller than a second preset temperature, operating according to the existing logic; step 3, if the difference between the refrigerant temperature value and the outside air temperature value is judged to be greater than or equal to a second preset temperature in the step 2, bypassing the outdoor heat exchanger; and step 4, if the difference between the cooling water temperature value and the external air temperature value is judged to be less than a third preset temperature, keeping the bypass to pass through the step 3 of the outdoor heat exchanger, and if the difference between the cooling water temperature value and the external air temperature value is judged to be greater than or equal to the third preset temperature, operating according to the existing logic.
And, the cooling water circulation line may include: and a heat supply unit connected to the refrigerant circulation line and exchanging heat between the refrigerant and the cooling water.
And, the cooling water circulation line may further include: an electronic device and a battery, the heat supply unit exchanging heat of waste heat of the electric device or the battery with the refrigerant flowing at the first bypass line.
The cooling water circulation line may be provided with a cooling water heater that operates the cooling water heater as an auxiliary heat source at an initial start-up stage of the vehicle to heat the battery or supplement the recovered heat when the recovered heat of the refrigerant is insufficient.
According to the heat pump system for a vehicle and the control method thereof of the present invention, it is possible to prevent a pressure loss of the refrigerant occurring in the outdoor heat exchanger in advance, and to recover only the heat source of the cooling water, thereby achieving an effect of stable heat pump operation.
Further, the following effects are also provided: when the energy of the heat source of the cooling water is reduced, the maximum heating mode in which the air heat source and the cooling water heat source are used together by the outdoor heat exchanger is returned again, so that the optimum condition can be selectively used according to the heat pump operation condition.
Further, since whether or not the air heat source by the outdoor heat exchanger is used can be selectively used according to the energy of the cooling water heat source, heating can be performed in accordance with various situations. That is, the use condition or the non-use condition of the air heat source by the outdoor heat exchanger may be judged by the outdoor temperature, the cooling water temperature, and the refrigerant temperature.
Further, the following effects are also provided: in addition to the case where the outdoor temperature is zero or the outdoor heat exchanger is frosted, whether the heat source of the air by the outdoor heat exchanger is used or not can be determined as necessary, and therefore, effective management can be achieved.
Drawings
Fig. 1 is a configuration diagram showing a conventional heat pump system for a vehicle.
Fig. 2 is a block diagram showing a conventional heat pump system for a vehicle.
Fig. 3 is a block diagram showing a heat pump system for a vehicle according to the present invention.
Fig. 4 is a flowchart illustrating a control method of the heat pump system for a vehicle according to the present invention.
Description of the symbols
100: the compressor 110: indoor heat exchanger
115: cooling water heater 120: first expansion unit
122: the two-way valve 130: outdoor heat exchanger
140: second expansion unit 160: evaporator with a heat exchanger
180: heat supply unit 191: first direction conversion valve
192: the second direction switching valve 200: electrical device
210: battery 300: control unit
S: cooling water circulation line R: refrigerant circulation line
R1: bypass line R2: auxiliary bypass line
A1': cooling water temperature value a 3': outside air temperature value
A2': temperature value of refrigerant
Detailed Description
In order that the present invention may be fully understood, preferred embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments of the present invention may be modified into various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail hereinafter. This example is provided to more fully illustrate the invention to those having average knowledge in the art. Therefore, the shapes and the like of the elements in the drawings may be exaggerated for clarity of explanation. It should be noted that there are situations in which identical components are denoted by the same reference numerals in the various figures. Also, detailed descriptions of well-known functions and configurations that are judged to be likely to unnecessarily obscure the gist of the present invention are omitted.
The present invention will be described in detail below with reference to the accompanying drawings.
Fig. 3 is a block diagram showing a heat pump system for a vehicle according to the present invention.
First, as shown in fig. 3, the heat pump system for a vehicle according to the present invention is configured such that: the compressor 100, the indoor heat exchanger 110, the first expansion unit 120, the outdoor heat exchanger 130, the second expansion unit 140, and the evaporator 160 are connected in sequence on the refrigerant circulation line R, which is suitable for application to an electric vehicle or a hybrid vehicle.
And the refrigerant circulation line R is provided with: a bypass line R1 bypassing the second expansion unit 140 and the evaporator 160; an auxiliary bypass line R2 bypassing the outdoor heat exchanger 130; and a dehumidification line R3 located at a rear side of the first expansion unit 120 so as to be disposed to directly flow the refrigerant to the evaporator 160, and a second direction switching valve 192 is disposed at a diverging point of the bypass line R2, and a two-way valve 122 is disposed at a diverging point of the dehumidification line R3.
Accordingly, in the air-conditioning mode, the refrigerant discharged from the compressor 100 circulates the outdoor heat exchanger 130, the second expansion unit 140, the evaporator 160, and the compressor 100 in sequence, and at this time, the indoor heat exchanger 110 performs a role of a condenser and the evaporator 160 performs a role of an evaporator. In this case, the outdoor heat exchanger 130 may function as the same condenser as the indoor heat exchanger 110.
And, in the heat pump mode, the refrigerant discharged from the compressor 100 circulates the indoor heat exchanger 110, the first expansion unit 120, the outdoor heat exchanger 130, the bypass line R1, and the compressor 100 in order, at which time, the indoor heat exchanger 110 performs a role of a condenser, and the outdoor heat exchanger 130 performs a role of an evaporator, and the refrigerant is not supplied to the second expansion unit 140 and the evaporator 160.
In addition, in the heat pump mode, when dehumidifying the vehicle interior, a part of the refrigerant passing through the refrigerant circulation line R is supplied to the evaporator 160 through the dehumidification line R3, and therefore, dehumidification of the vehicle interior is performed.
As described above, in the heat pump system of the present invention, since the circulation directions of the refrigerant in the air-conditioning mode and the heat pump mode are the same, the refrigerant circulation line R can be commonly used, and the refrigerant stagnation phenomenon occurring when there is no flow of the refrigerant can be prevented, and the refrigerant circulation line R can be simplified.
In this case, the compressor 100 provided on the refrigerant circulation line R receives power from an engine (internal combustion engine pipe) or a motor or the like to be driven, and sucks and compresses refrigerant, and then discharges the refrigerant in a high-temperature and high-pressure gas state.
The compressor 100 sucks and compresses the refrigerant discharged from the evaporator 160 side and supplies it to the indoor heat exchanger 110 side in the air-conditioning mode, and sucks and compresses the refrigerant discharged from the outdoor heat exchanger 130 through the bypass line R1 and supplies it to the indoor heat exchanger 110 side in the heat pump mode.
Also, in the dehumidification mode in the heat pump mode, since the refrigerant is simultaneously supplied to the evaporator 160 through the bypass line R1 and the dehumidification line R3, in this case, the compressor 100 sucks and compresses the refrigerant merged after passing through the bypass line R1 and the evaporator 160, and supplies it to the indoor heat exchanger 110 side.
The indoor heat exchanger 110 is disposed inside an air conditioner case 150 and connected to an outlet-side refrigerant circulation line R of the compressor 100 to exchange heat between air flowing inside the air conditioner case 150 and refrigerant discharged from the compressor 100.
The evaporator 160 is provided inside the air conditioning case 150, and is connected to an inlet-side refrigerant circulation line R of the compressor 100 to exchange heat between air flowing through the air conditioning case 150 and refrigerant flowing toward the compressor 100.
The indoor heat exchanger 110 functions as a condenser in both an air-conditioning mode and a heat pump mode, and functions as an evaporator in the air-conditioning mode for the evaporator 160; in the heat pump mode, since there is no supply of refrigerant, the operation is stopped; in the dehumidification mode, since a part of the refrigerant is supplied, it functions as an evaporator.
Also, the indoor heat exchanger 110 and the evaporator 160 are provided at a predetermined interval inside the air-conditioning case 150, and the evaporator 160 and the indoor heat exchanger 110 are provided in order from the upstream side in the air flow direction inside the air-conditioning case 150.
Therefore, in the air conditioning mode in which the evaporator 160 functions as an evaporator, the low-temperature and low-pressure refrigerant discharged from the second expansion unit 140 is supplied to the evaporator 160, and at this time, air flowing inside the air conditioning case 150 by a blower (not shown) exchanges heat with the low-temperature and low-pressure refrigerant inside the evaporator 160 while passing through the evaporator 160, is converted into cool air, and is then discharged into the vehicle interior, thereby cooling the vehicle interior.
In the heat pump mode in which the indoor heat exchanger 110 functions as a condenser, the high-temperature and high-pressure refrigerant discharged from the compressor 100 is supplied to the indoor heat exchanger 110, and at this time, the air flowing through the air conditioner case 150 by the blower exchanges heat with the high-temperature and high-pressure refrigerant inside the indoor heat exchanger 110 while passing through the indoor heat exchanger 110, is converted into warm air, and is then discharged into the vehicle interior, thereby heating the vehicle interior. In addition, the evaporator 160 is formed to be larger than the indoor heat exchanger 110.
A temperature adjusting door 151 for adjusting the amount of air bypassing the indoor heat exchanger 110 and the amount of air passing through the indoor heat exchanger 110 is provided between the evaporator 160 and the indoor heat exchanger 110 inside the air-conditioning case 150.
The temperature-adjusting door 151 adjusts the amount of air bypassed through the indoor heat exchanger 110 and the amount of air passed through the indoor heat exchanger 110, thereby appropriately adjusting the amount of air discharged from the air-conditioning case 150, at which time, in an air-conditioning mode, if a front-side passage of the indoor heat exchanger 110 is completely closed by the temperature-adjusting door 151, cool air passed through the evaporator 160 is bypassed through the indoor heat exchanger 110 to be supplied into the vehicle interior, and thus the highest degree of cooling is performed; in the heat pump mode, if a path bypassing the indoor heat exchanger 110 is completely closed by the temperature-adjusting door 151, so that all air is converted into warm air by the indoor heat exchanger 110 functioning as a condenser, and the warm air is supplied into the vehicle interior, heating is performed.
The outdoor heat exchanger 130 is disposed outside the air-conditioning case 150 and connected to the refrigerant circulation line R, so that the refrigerant circulating through the refrigerant circulation line R can exchange heat with the outside air.
Here, the outdoor heat exchanger 130 is provided at a front side of the vehicle engine compartment, and exchanges heat between the refrigerant flowing inside and the outside air. The outdoor heat exchanger 130 functions as a condenser similar to the indoor heat exchanger 110 in the air-conditioning mode, and the high-temperature refrigerant flowing through the inside of the outdoor heat exchanger 130 exchanges heat with the outside air to be condensed. In the heat pump mode, the function of the evaporator is performed in reverse to that of the indoor heat exchanger 110, and at this time, the low-temperature refrigerant flowing inside the outdoor heat exchange air 130 exchanges heat with the outside air and is evaporated.
And, the first expansion unit 120 is provided on the refrigerant circulation line R between the indoor heat exchanger 110 and the outdoor heat exchanger 130 to selectively expand the refrigerant supplied to the outdoor heat exchanger 130 according to an air-conditioning mode or a heat pump mode.
The refrigerant passing through the outdoor heat exchanger 130 flows toward the second expansion unit 140 and the evaporator 160, but in the heat pump mode, the refrigerant passing through the outdoor heat exchanger 130 directly flows toward the compressor 100 through the bypass line R1, so that the second expansion unit 140 and the evaporator 160 can be bypassed.
Here, the function of switching the flow direction of the refrigerant according to the air-conditioning mode or the heat pump mode is realized by the first direction switching valve 191.
The first direction switching valve 191 is disposed at a diverging point of the bypass line R1 and the refrigerant circulation line R to switch a refrigerant flow direction in such a manner that the refrigerant passing through the outdoor heat exchanger 130 flows to the bypass line R1 or the second expansion unit 140 according to an air-conditioning mode or a heat pump mode.
At this time, the first direction switching valve 191 switches the direction in the air-conditioning mode so that the refrigerant discharged from the compressor 100 and passing through the indoor heat exchanger 110 and the outdoor heat exchanger 130 flows toward the second expansion unit 140 and the evaporator 160; in the heat pump mode, the refrigerant discharged from the compressor 100 and passing through the indoor heat exchanger 110 and the outdoor heat exchanger 130 is changed in direction so as to flow to the bypass line R1.
In addition, the first direction conversion valve 191 is provided at an inlet side branch point of the bypass line R1, and a three-way valve is preferably used. In addition to the first direction switching valve 191, the second direction switching valve 192 is also preferably a three-way valve.
A heat supply unit 180 for supplying heat to the refrigerant flowing along the bypass line R1 is provided at the bypass line R1.
The heat supply unit 180 is connected to a refrigerant circulation line R and a cooling water circulation line S so that the refrigerant and the cooling water exchange heat. In this case, the cooling water circulation line S is connected to the electric device 200 and the battery 210, so that waste heat of the electric device 200 and the battery 210 can be supplied from the heat supply unit 180 to the refrigerant flowing through the bypass line R1. Therefore, in the heat pump mode, the heat source is recovered from the exhaust heat of vehicle electric device 200 and battery 210, and the heating performance can be improved. In addition, the vehicle electric device 200 is typically a motor, an inverter (inverter), or the like.
An accumulator is provided in the inlet-side refrigerant circulation line R of the compressor 100. The accumulator separates liquid refrigerant and gaseous refrigerant in the refrigerant supplied to the compressor 100, thereby supplying only gaseous refrigerant to the compressor 100.
In addition, a cooling water heater 115 for raising the temperature of the battery 210 may be provided on the cooling water circulation line S. That is, at the initial start-up of the vehicle, the battery 210 can be heated by operating the cooling water heater 115 as an auxiliary heat source, and the cooling water heater 115 can be operated even when the amount of heat recovered by the refrigerant is insufficient. As the cooling water heater 115, a PTC heater is preferably used.
And, the bypass line R1 is provided to connect the inlet-side refrigerant circulation line R of the second expansion unit 140 and the outlet-side refrigerant circulation line R of the evaporator 160, so that the refrigerant circulating in the refrigerant circulation line R selectively bypasses the second expansion unit 140 and the evaporator 160.
As shown, the bypass line R1 is arranged in parallel with the second expansion unit 140 and the evaporator 160, that is, the inlet side of the bypass line R1 is connected to the refrigerant circulation line R connecting the outdoor heat exchanger 130 and the second expansion unit 140, and the outlet side is connected to the refrigerant circulation line R connecting the evaporator 160 and the compressor 100.
And, a second direction switching valve 192 is provided to switch a flow direction of the refrigerant so that the refrigerant circulating through the refrigerant circulation line R selectively flows to the auxiliary bypass line R2, and the second direction switching valve 192 is provided at a branching point between the auxiliary bypass line R2 and the refrigerant circulation line R to switch the flow direction of the refrigerant so that the refrigerant flows to the outdoor heat exchanger 130 or the auxiliary bypass line R2.
At this time, in the case where the outdoor heat exchanger 130 is frosted or the outdoor temperature is less than 0 ℃, the second direction switching valve 192 bypasses the refrigerant circulating through the outdoor heat exchanger 130 because the outdoor heat exchanger 130 cannot smoothly absorb heat from the outside air.
In addition, it is not necessary to use 0 ℃ as the standard of the outdoor temperature, and the heating performance and efficiency of the system can be improved by passing the refrigerant through the outdoor heat exchanger 130 only when the heat exchange efficiency between the outdoor air and the refrigerant flowing through the outdoor heat exchanger 130 is high, and by passing the refrigerant through the outdoor heat exchanger 130 when the heat exchange efficiency is not satisfactory.
When frost is formed on the outdoor heat exchanger 130, if the refrigerant flows to the auxiliary bypass line R2 and bypasses the outdoor heat exchanger 130, the frost can be delayed or removed.
A dehumidification line R3 is provided in the refrigerant circulation line R to supply a part of the refrigerant circulating in the refrigerant circulation line R to the evaporator 160, thereby performing dehumidification of the vehicle interior in the heat pump mode.
At this time, in order to dehumidify the vehicle interior, it is necessary to supply a low-temperature refrigerant to the evaporator 160, and therefore the dehumidification line R3 is connected to the section in which the low-temperature refrigerant circulates in the refrigerant circulation line R.
Explained in more detail, the dehumidification line R3 is provided to supply a part of the low temperature refrigerant passing through the first expansion unit 120 to the evaporator 160 side. That is, the dehumidification line R3 is provided to connect the refrigerant circulation line R on the outlet side of the first expansion unit 120 and the refrigerant circulation line R on the inlet side of the evaporator 160.
As can be seen from the drawing, the inlet of the dehumidification line R3 is connected to the refrigerant circulation line R between the first expansion unit 120 and the outdoor heat exchanger 130, so that a part of the refrigerant after passing through the first expansion unit 120 before flowing into the outdoor heat exchanger 130 flows toward the dehumidification line R3 and is supplied to the evaporator 160 side.
That is, in the dehumidification mode in the vehicle interior, after the refrigerant is passed through the first expansion unit 120, a part of the refrigerant before flowing into the outdoor heat exchanger 130 is supplied to the evaporator 160 side through the dehumidification line R3.
In addition, in the heat pump system for a vehicle according to the present invention, the electric device 200 and the battery 210 are arranged on the cooling water circulation line S, so that in the heating mode, as a heat recovery source of the refrigerant, waste heat of the battery 210 is used in addition to waste heat of the electric device 200. In this case, unlike the existing electric automobile, in the electric vehicle equipped with the battery thermal management system, the cooling water temperature is made high according to the charging condition and the running condition. This is because the temperature of the cooling water can be arbitrarily increased by the cooling water heater 115 in the charged state of the battery 210, and thus the amount of heat recovered by the refrigerant can be greatly increased in the heat pump system for a vehicle. The cooling water heater 115 is provided to increase the temperature of the battery 210, and the cooling water heater 115 has the following functions: the temperature of the cooling water is increased and the cooling water and the battery 210 are heat-exchanged by means of the battery cooler, thereby increasing the temperature of the battery 210 to a normal operation temperature.
In addition, if the temperature of the cooling water is high, the energy of the air heat source absorbing heat from the outdoor heat exchanger 130 is reduced, or the refrigerant passes through the outdoor unit under the condition that the air heat source cannot be absorbed, so that the degree of loss due to pressure loss is increased more than the degree of gain due to heat absorption in the outdoor heat exchanger 130, and thus the system performance may be degraded. Therefore, the outdoor heat exchanger 130 may not be able to suck the energy of the air side, or may release the energy of the refrigerant to the air side.
In the heat pump system, when the recovered heat source energy of the refrigerant is greatly increased, both the high-pressure-side pressure and the low-pressure-side pressure of the heat pump system are increased, and in this case, the following phenomenon is often found: if the heat source energy of the cooling water increases to a specific level or more as the battery thermal management system is introduced into the heat pump system for a vehicle, the temperature of the refrigerant flowing on the low-pressure side also increases at the same time, and therefore the temperature of the refrigerant becomes similar to the outside air temperature, or the temperature of the refrigerant further increases, so that heat exchange on the side of the outdoor heat exchanger 130 hardly occurs, and a passage through which a pressure loss of the refrigerant occurs is formed.
In order to solve the above-described problems, the present invention provides a heat pump system for a vehicle and a control method thereof, in which a cooling water temperature sensor provided in a cooling water circulation line S, a refrigerant temperature sensor provided at an outlet side of an outdoor heat exchanger 130, and an outside air temperature sensor for sensing an air temperature outside the vehicle are provided, and a control unit can compare the sensed values of the temperature sensors to grasp a condition of a heat source of cooling water, and determine a bypass of the outdoor heat exchanger 130 based on the grasped condition. That is, the present invention is characterized by the following configuration: the efficiency of the air conditioner can be improved by further providing an outdoor unit bypass mode for bypassing the outdoor heat exchanger 130 when a specific condition other than the existing logic occurs.
Here, the conventional logic represents a method conventionally performed in the heat pump system for a vehicle, that is, a method of bypassing the refrigerant through the outdoor heat exchanger 130 by the second direction switching valve 192 only when the outdoor temperature is zero or the outdoor heat exchanger 130 is frosted.
Fig. 4 is a flowchart illustrating a control method of a heat pump system for a vehicle according to the present invention.
As shown in fig. 3 and 4, the present invention includes a cooling water temperature sensor a1 provided to the cooling water circulation line S, a refrigerant temperature sensor a2 provided to the outlet side of the outdoor heat exchanger 130, and an outside air temperature sensor A3 for sensing the temperature of air outside the vehicle, and the respective sensed temperature values a1', a2', A3' are transmitted to the control part 300.
In the control part 300, the cooling water temperature value a1 'and the outside air temperature value A3' are compared, and if it is determined that the cooling water temperature value a1 'is greater than or equal to the preset temperature C1 as compared to the outside air temperature value A3', the next comparison step S200 is performed, and if it is determined that it is less than the preset temperature C1, the existing logic is operated (S100).
That is, the reason for this is that since the cooling water flowing in the cooling water circulation line S according to the present invention can recover the electric device waste heat and the heat source of the battery, in the case where the cooling water temperature value a1' is higher than or equal to the preset temperature C1, since the heat of the water heat source is sufficient, it may be disadvantageous to the recovery of the air heat source. In this case, the preset temperature C1 is preferably set to 9 to 11 degrees. This means that, in a general vehicle, the cooling water temperature can be heated by the electric device waste heat and the heat source of the battery on average in accordance with the set temperature C1.
In this case, if the control part 300 determines that the refrigerant temperature value a2 'is greater than or equal to the preset temperature C2 than the outside air temperature value A3', the second direction switching valve 192 is controlled to bypass the outdoor heat exchanger 130 of the next step S300. And, if the control part 300 determines that the difference between the refrigerant temperature value a2 'and the outside air temperature value A3' is less than the preset temperature C2, it controls to execute the existing logic (S200).
That is, under the condition that the water heat source is excessive, there is a high probability that the refrigerant will function as a simple passage rather than a heat exchanger when passing through the outdoor heat exchanger 130 side, and accordingly, there is a possibility that the refrigerant will function as a negative passage in which a simple pressure loss is generated. In this case, the preset temperature (C2) is preferably set to 2 to 4 ℃.
In this case, the control part 300 makes the second direction switching valve 192 perform switching adjustment so that the refrigerant bypasses the outdoor heat exchanger 130, and performs the next step S400.
Thereafter, if the control part 300 determines that the cooling water temperature value a1 'is less than the preset temperature C3 compared to the outside air temperature value A3', the step S300 of bypassing the outdoor heat exchanger 130 is maintained, and if it is determined to be greater than or equal to the set temperature C3, the existing logic is operated (S400).
Also in this case, the preset temperature C3 is preferably set to 4 ℃ to 6 ℃.
Therefore, according to the heat pump system for a vehicle and the control method thereof according to the present invention, the following effects are provided: it is possible to prevent a pressure loss of the refrigerant from the outdoor heat exchanger 130 in advance and to recover only the heat source of the cooling water, thereby realizing a stable heat pump operation.
Further, the following effects are obtained: in the case where the energy of the heat source of the cooling water is reduced, it is possible to return to the maximum heating mode in which the air heat source and the cooling water heat source via the outdoor heat exchanger 130 are simultaneously used, so that the most suitable conditions are selectively used according to the heat pump operation conditions.
Further, the use or non-use of the air heat source by the outdoor heat exchanger 130 can be selectively used according to the energy of the cooling water heat source, and heating can be performed according to various situations. That is, the use condition or the non-use condition of the air heat source by the outdoor heat exchanger 130 can be determined using the outdoor temperature, the cooling water temperature, and the refrigerant temperature by the temperature sensors.
In addition, although the outdoor heat exchanger 130 is bypassed by the second direction switching valve 192 when the outdoor temperature is zero or the outdoor heat exchanger 130 is frosted, the use of the heat source of the air can be determined even when the outdoor temperature is not zero or the outdoor heat exchanger 130 is not frosted, and thus effective management can be achieved.
In this case, in order to sense the surface temperature of the battery, a temperature sensor equipped at one side of the battery may be additionally applied. That is, whether the air heat source via the outdoor heat exchanger 130 is used or not may also be determined using the cooling water temperature value a1', the refrigerant temperature value a2', the outside air temperature value A3', and the battery temperature.
The embodiments of the heat pump system for a vehicle and the control method thereof according to the present invention described above are merely exemplary, and it is understood that various modifications and equivalent other embodiments can be implemented by those having basic knowledge in the technical field to which the present invention pertains. It is to be understood, therefore, that this invention is not limited to the forms set forth in the above detailed description. Therefore, the true technical scope of the present invention should be determined according to the technical idea of the appended claims. Also, it is to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the scope of the appended claims.
Claims (14)
1. A heat pump system for a vehicle, characterized by comprising:
a compressor (100) which is provided in the refrigerant circulation line (R) and compresses and discharges the refrigerant;
an indoor heat exchanger (110) that is provided inside an air conditioning casing (150) and exchanges heat between air inside the air conditioning casing (150) and air discharged from the compressor (100);
an evaporator (160) provided inside the air-conditioning case (150) and exchanging heat between air inside the air-conditioning case (150) and the refrigerant supplied to the compressor (100);
an outdoor heat exchanger (130) which is provided outside the air conditioning case (150) and exchanges heat between the refrigerant circulating in the refrigerant circulation line (R) and outside air;
a first expansion unit (120) that is provided on a refrigerant circulation line (R) between the indoor heat exchanger (110) and the outdoor heat exchanger (130) and expands the refrigerant;
a second expansion unit (140) which is provided on an inlet-side refrigerant circulation line (R) of the evaporator (160) and expands the refrigerant;
a first bypass line (R1) provided to connect an inlet side refrigerant circulation line (R) of the second expansion unit (140) and an outlet side refrigerant circulation line (R) of the evaporator (160) and bypass refrigerant through the second expansion unit (140) and the evaporator (160);
a second bypass line (R2) provided to connect the outlet-side refrigerant circulation line (R) of the first expansion unit (120) and the outlet-side refrigerant circulation line (R) of the outdoor heat exchanger (130) and to bypass refrigerant through the outdoor heat exchanger (130);
a cooling water temperature sensor (A1) provided in the cooling water circulation line (S);
a refrigerant temperature sensor (A2) provided on an outlet side of the outdoor heat exchanger (130);
an outside air temperature sensor (a3) that senses the temperature of air outside the vehicle; and
a control unit (300) that compares temperature values sensed by a cooling water temperature sensor (A1), a refrigerant temperature sensor (A2), and an outside air temperature sensor (A3) and determines whether or not to bypass the outdoor heat exchanger (130) by passing the refrigerant through a second bypass line (R2),
the control unit (300) controls such that:
in the case where the cooling water temperature value (a1') and the outside air temperature value (A3') are compared and it is determined that the difference between the cooling water temperature value (a1') and the outside air temperature value (A3') is greater than or equal to the first preset temperature (C1), it is determined whether the difference between the refrigerant temperature value (a2') and the outside air temperature value (A3') is less than the second preset temperature (C2), and if it is determined that the difference is greater than or equal to the second preset temperature (C2), the second direction switching valve (192) is controlled to bypass the outdoor heat exchanger (130).
2. The heat pump system for a vehicle according to claim 1, wherein said control unit (300) controls such that:
when the cooling water temperature value (a1') and the outside air temperature value (A3') are compared and it is determined that the difference between the cooling water temperature value (a1') and the outside air temperature value (A3') is less than a first preset temperature (C1), the refrigerant is controlled to bypass the outdoor heat exchanger (130) through the second direction switching valve (192) only in the case where the outside air temperature is zero or the outdoor heat exchanger (130) is frosted.
3. The heat pump system for a vehicle according to claim 2,
the first preset temperature (C1) is set to 9 ℃ to 11 ℃.
4. The heat pump system for a vehicle according to claim 1,
the second preset temperature (C2) is set to 2 to 4 ℃.
5. The heat pump system for a vehicle according to claim 1, wherein said control unit (300) controls such that:
bypassing the outdoor heat exchanger (130) if it is determined that the difference between the cooling water temperature value (a1') and the outside air temperature value (A3') is less than a third preset temperature (C3), and bypassing the refrigerant through the outdoor heat exchanger (130) by passing through the second direction switching valve (192) only if the outside air temperature is zero or the outdoor heat exchanger (130) is frosted if it is determined that the difference between the cooling water temperature value (a1') and the outside air temperature value (A3') is greater than or equal to the third preset temperature (C3).
6. The heat pump system for a vehicle according to claim 5,
the third preset temperature (C3) is set to 4 ℃ to 6 ℃.
7. The heat pump system for a vehicle according to claim 1,
the cooling water circulation line (S) includes: and a heat supply unit (180) connected to the refrigerant circulation line (R) and exchanging heat between the refrigerant and the cooling water.
8. The heat pump system for a vehicle according to claim 7, wherein said cooling water circulation line (S) further comprises: an electrical device (200) and a battery (210),
the heat supply unit (180) exchanges heat of waste heat of an electric device (200) or a battery (210) with the refrigerant flowing through the first bypass line (R1).
9. The heat pump system for a vehicle according to claim 8, wherein a cooling water heater (115) is provided in the cooling water circulation line (S), and the cooling water heater (115) operates the cooling water heater (115) as an auxiliary heat source at an initial start-up period of the vehicle to heat the battery (210) or supplement the recovered heat in a case where the recovered heat of the refrigerant is insufficient.
10. A control method of a heat pump system for a vehicle, wherein the heat pump system for a vehicle includes:
a compressor (100) which is provided in the refrigerant circulation line (R) and compresses and discharges the refrigerant;
an indoor heat exchanger (110) which is provided inside an air conditioning casing (150) and exchanges heat between air inside the air conditioning casing (150) and air discharged from the compressor (100);
an evaporator (160) provided inside the air-conditioning case (150) and exchanging heat between air inside the air-conditioning case (150) and the refrigerant supplied to the compressor (100);
an outdoor heat exchanger (130) which is provided outside the air conditioning case (150) and exchanges heat between the refrigerant circulating in the refrigerant circulation line (R) and outside air;
a first expansion unit (120) that is provided on a refrigerant circulation line (R) between the indoor heat exchanger (110) and the outdoor heat exchanger (130) and expands the refrigerant;
a second expansion unit (140) which is provided on an inlet-side refrigerant circulation line (R) of the evaporator (160) and expands the refrigerant;
a first bypass line (R1) provided to connect an inlet side refrigerant circulation line (R) of the second expansion unit (140) and an outlet side refrigerant circulation line (R) of the evaporator (160) and bypass refrigerant through the second expansion unit (140) and the evaporator (160);
a second bypass line (R2) provided to connect the outlet-side refrigerant circulation line (R) of the first expansion unit (120) and the outlet-side refrigerant circulation line (R) of the outdoor heat exchanger (130) and to bypass refrigerant through the outdoor heat exchanger (130);
a cooling water temperature sensor (A1) which is provided in the cooling water circulation line (S) and measures a cooling water temperature value (A1');
a refrigerant temperature sensor (a2) disposed at an outlet side of the outdoor heat exchanger (130) and measuring a refrigerant temperature value (a 2');
an outside air temperature sensor (A3) for sensing the temperature of the air outside the vehicle to measure an outside temperature value (A3'),
wherein the control method of the heat pump system for a vehicle includes the steps of:
step 1 of comparing the cooling water temperature value (a1') and the outside air temperature value (A3') so that, if it is determined that the difference between the cooling water temperature value (a1') and the outside air temperature value (A3') is less than a first preset temperature (C1), refrigerant bypasses the outdoor heat exchanger (130) through a second direction switching valve (192) only in the case where the outside air temperature is zero or the outdoor heat exchanger (130) is frosted;
step 2, if it is determined that the difference between the refrigerant temperature value (a2') and the outside air temperature value (A3') is less than a second preset temperature (C2), bypassing the refrigerant through the outdoor heat exchanger (130) by passing through the second direction switching valve (192) only in the case where the outside air temperature is zero or the outdoor heat exchanger (130) is frosted;
a step 3 of bypassing the outdoor heat exchanger (130) if it is determined in the step 2 that the difference between the refrigerant temperature value (a2') and the outside air temperature value (A3') is greater than or equal to a second preset temperature (C2); and
and 4, if it is determined that the difference between the cooling water temperature value (a1') and the outside air temperature value (A3') is less than the third preset temperature (C3), maintaining the step 3 of bypassing the outdoor heat exchanger (130), and if it is determined that the difference between the cooling water temperature value (a1') and the outside air temperature value (A3') is greater than or equal to the third preset temperature (C3), bypassing the refrigerant through the second direction switching valve (192) and the outdoor heat exchanger (130) only in the case where the outside air temperature is zero or the outdoor heat exchanger (130) is frosted.
11. The control method of a heat pump system for a vehicle according to claim 10,
the first preset temperature (C1) is set to 9 to 11℃,
the second preset temperature (C2) is set to 2 to 4℃,
and the third preset temperature (C3) is set to 4 to 6 ℃.
12. The control method of a heat pump system for a vehicle according to claim 11, wherein said cooling water circulation line (S) includes:
a heat supply unit (180) connected to the refrigerant circulation line (R) to exchange heat between the refrigerant and the cooling water.
13. The control method of a heat pump system for a vehicle according to claim 12, wherein said cooling water circulation line (S) further comprises: an electrical device (200) and a battery,
the heat supply unit (180) exchanges heat of waste heat of an electric device (200) or a battery (210) with the refrigerant flowing through the first bypass line (R1).
14. The control method of a heat pump system for a vehicle according to claim 13,
the cooling water circulation line (S) is provided with a cooling water heater (115), and the cooling water heater (115) is used as an auxiliary heat source to operate the cooling water heater (115) in the initial starting stage of the vehicle so as to heat a battery (210) or supplement the recovered heat when the recovered heat of the refrigerant is insufficient.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020170140771A KR102445224B1 (en) | 2017-10-27 | 2017-10-27 | Heat pump system for vehicle and control method |
| KR10-2017-0140771 | 2017-10-27 |
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| CN109720165A CN109720165A (en) | 2019-05-07 |
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| KR102290776B1 (en) * | 2019-05-08 | 2021-08-19 | 엘지전자 주식회사 | Heat pump system for electric vehicle and control method thereof |
| US11529848B2 (en) * | 2019-07-29 | 2022-12-20 | Hyundai Motor Company | Heat pump system control method for vehicle |
| KR20210097370A (en) * | 2020-01-30 | 2021-08-09 | 한온시스템 주식회사 | Combined valve unit and heat pump system for vehicle |
| CN113071288B (en) * | 2021-04-28 | 2022-06-14 | 吉林大学 | Solar vehicle-mounted auxiliary air conditioning system |
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| CN105555564A (en) * | 2013-07-11 | 2016-05-04 | 三菱重工汽车空调系统株式会社 | Heat-pump-type vehicle air conditioning system and defrosting method thereof |
| CN105431313A (en) * | 2013-07-26 | 2016-03-23 | 松下知识产权经营株式会社 | Vehicle air conditioner |
| CN105764727A (en) * | 2013-11-25 | 2016-07-13 | 株式会社电装 | Heat pump system |
| CN106662366A (en) * | 2014-06-18 | 2017-05-10 | 株式会社电装 | Refrigeration cycle device |
| KR20160048237A (en) * | 2014-10-23 | 2016-05-04 | 한온시스템 주식회사 | Heat pump system for vehicle |
| JP2016121827A (en) * | 2014-12-24 | 2016-07-07 | カルソニックカンセイ株式会社 | Vehicular air conditioner |
| CN107206865A (en) * | 2015-02-06 | 2017-09-26 | 株式会社电装 | Vehicle heat management system |
| CN107031347A (en) * | 2016-01-13 | 2017-08-11 | 翰昂汽车零部件有限公司 | On-vehicle battery temperature-adjusting device and the in-vehicle air conditioner for being equipped with the adjusting means |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20190047198A (en) | 2019-05-08 |
| CN109720165A (en) | 2019-05-07 |
| KR102445224B1 (en) | 2022-09-20 |
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