CN-122008774-A - Control method for heat pump system for vehicle

Abstract

A control method of a heat pump system for a vehicle is provided, which can improve heating efficiency by efficiently recovering heat energy generated by a battery while adjusting the temperature of the battery.

Inventors

• ZHENG CHENGBIN

Assignees

• 现代自动车株式会社
• 起亚株式会社

Dates

Publication Date

20260512

Application Date

20250620

Priority Date

20241111

Claims (20)

1. 1. A control method of a heat pump system for a vehicle, the method comprising the steps of: (A) Based on a user operating a heating mode for heating the vehicle interior, the controller circulates coolant to the electrical components and the cooler, and while controlling the operation of the heat pump system, the controller determines whether the battery temperature is higher than or equal to a first predetermined temperature based on the data detected from the data detection unit; (B) When the controller determines that the battery temperature is higher than or equal to the first predetermined temperature through the process (a), the controller determines a discharge pressure of the compressor, an amount of change in the discharge pressure of the compressor, and a vehicle interior temperature while circulating the coolant to the battery and the cooler and maintaining the heating mode, and controls the operation of the cooling fan and the heat pump system; (C) After performing the process (B), the controller determines the amount of change in the temperature of the battery and circulates the coolant to the radiator and the battery, and (D) After performing the process (C), the controller controls the operation of the cooling fan and the heat pump system while circulating the coolant to the battery and the cooler by determining whether the battery temperature is higher than a second predetermined temperature based on the data detected from the data detection unit, and controls the compressor by determining whether the battery temperature is higher than a third predetermined temperature and determining whether the battery temperature is lower than the first predetermined temperature.
2. 2. The control method according to claim 1, wherein the process (a) includes the steps of: The controller operates the heat pump system based on a user's operation of the heat pump system for heating the vehicle interior, and operates the heating mode; a controller for connecting the electric component and the cooler by using at least two lines through which coolant flows and controlling the operation of the heat pump system, and The controller determines whether the battery temperature is higher than or equal to a first predetermined temperature based on the data detected from the data detection unit.
3. 3. The control method according to claim 2, wherein, in the step of the controller connecting the electrical component and the cooler by using at least two lines through which the coolant flows, and controlling the operation of the heat pump system, the controller is configured to: Controlling the first expansion valve to be closed so that the refrigerant is not supplied to the evaporator; controlling the second expansion valve to open so that unexpanded refrigerant is supplied to the cooler; Controlling the third expansion valve to be opened to perform expansion so that the expanded refrigerant is supplied to the heat exchanger, and The compressor is operated at a maximum rotational speed (RPM).
4. 4. The control method according to claim 2, wherein when the controller determines that the battery temperature is lower than the first predetermined temperature in the step of determining whether the battery temperature is higher than or equal to the first predetermined temperature, the method returns to connecting the electrical components and the cooler by using at least two lines through which the coolant flows, and controlling the operation of the heat pump system.
5. 5. The control method according to claim 2, wherein the process (B) is performed when the controller determines that the battery temperature is higher than or equal to the first predetermined temperature in the step of determining whether the battery temperature is higher than or equal to the first predetermined temperature.
6. 6. The control method according to claim 2, wherein the process (B) includes the steps of: the controller connects the battery and the cooler by using at least two lines through which the coolant flows; The controller determines whether the discharge pressure of the compressor is greater than a predetermined pressure based on the data detected from the data detection unit; When the controller determines that the discharge pressure of the compressor is greater than the predetermined pressure in the step of determining whether the discharge pressure of the compressor is greater than the predetermined pressure, the controller increases the opening degree of the third expansion valve operated to be opened to perform expansion; The controller determines whether the variation of the discharge pressure of the compressor is greater than 0 based on the data detected from the data detection unit; when the controller determines that the variation of the discharge pressure of the compressor is greater than 0 in the step of determining whether the variation of the discharge pressure of the compressor is greater than 0, the controller reduces the rotation speed of the compressor; the controller determines whether the vehicle interior temperature is higher than a predetermined target temperature based on the data detected from the data detection unit, and When the controller determines that the vehicle interior temperature is higher than the target temperature in the step of determining whether the vehicle interior temperature is higher than the target temperature, the controller controls the cooling fan and controls the heat pump system so that the use of the heat pump system can be minimized.
7. 7. The control method according to claim 6, wherein, when the controller determines that the discharge pressure of the compressor is less than the predetermined pressure in the step of determining whether the discharge pressure of the compressor is greater than the predetermined pressure, The method returns to the controller to connect the battery and the cooler by using at least two lines through which the coolant flows.
8. 8. The control method according to claim 6, wherein, when the controller determines that the variation of the discharge pressure of the compressor is less than 0 in the step of determining whether the variation of the discharge pressure of the compressor is greater than 0, The method returns to the controller increasing the opening of the third expansion valve that is operated to open to perform expansion.
9. 9. The control method according to claim 6, wherein when the controller determines that the vehicle interior temperature is lower than the target temperature in the step of determining whether the vehicle interior temperature is higher than the target temperature, The method returns to the controller to reduce the speed of the compressor.
10. 10. The control method according to claim 6, wherein in the step of the controller controlling the cooling fan and controlling the heat pump system so that the use of the heat pump system can be minimized, the controller is configured to: operating the compressor at a minimum rotational speed; Reducing the rotational speed of the cooling fan, and The rotational speed of the corresponding water pump is reduced so that the flow rate of the coolant circulated through the battery and the cooler is reduced.
11. 11. The control method according to claim 6, wherein the process (C) includes the steps of: the controller determines whether the battery temperature variation is higher than 0 ℃ based on the data detected from the data detection unit, and When the controller determines that the battery temperature variation amount is higher than 0 ℃ in the step of determining whether the battery temperature variation amount is higher than 0 ℃, the controller connects the radiator and the battery by using at least two lines through which the coolant flows.
12. 12. The control method according to claim 11, wherein, when the controller determines that the battery temperature variation is lower than 0 ℃ in the step of determining whether the battery temperature variation is higher than 0 ℃, The method returns to the process (B) where the controller connects the battery and the cooler by using at least two lines through which the coolant flows.
13. 13. The control method according to claim 11, wherein the process (D) includes the steps of: the controller determines whether the battery temperature is higher than a second predetermined temperature based on the data detected from the data detection unit; when the controller determines that the battery temperature is higher than the second predetermined temperature in the step of determining whether the battery temperature is higher than the second predetermined temperature, the controller connects the battery and the cooler by using at least two lines through which the coolant flows, and controls the operation of the cooling fan and the heat pump system; the controller determines whether the battery temperature is higher than a third predetermined temperature based on the data detected from the data detection unit; When the controller determines that the battery temperature is higher than the third predetermined temperature in the step of determining whether the battery temperature is higher than the third predetermined temperature, the controller increases the rotation speed of the compressor; The controller determines whether the battery temperature is lower than a first predetermined temperature based on the data detected from the data detection unit, and The controller terminates control when it is determined that the battery temperature is lower than the first predetermined temperature in the step of determining whether the battery temperature is lower than the first predetermined temperature.
14. 14. The control method according to claim 13, wherein, when the controller determines that the battery temperature is lower than the second predetermined temperature in the step of determining whether the battery temperature is higher than the second predetermined temperature, The method returns to the process (C) where the controller connects the radiator and the battery by using at least two lines through which coolant flows.
15. 15. The control method according to claim 13, wherein in the step of connecting the battery and the cooler by using at least two lines through which the coolant flows, and controlling the operation of the cooling fan and the heat pump system, the controller is configured to: Controlling the first expansion valve to be closed so that the refrigerant is not supplied to the evaporator; Controlling the second expansion valve to be opened to perform expansion such that the expanded refrigerant is supplied to the cooler; controlling the third expansion valve to open so that unexpanded refrigerant is supplied to the heat exchanger, and The rotation speed of the cooling fan is increased.
16. 16. The control method according to claim 13, wherein, when the controller determines that the battery temperature is lower than the third predetermined temperature in the step of determining whether the battery temperature is higher than the third predetermined temperature, The method returns to the controller to connect the battery and the cooler by using at least two lines through which the coolant flows, and to control the operation of the cooling fan and the heat pump system.
17. 17. The control method according to claim 13, wherein, when the controller determines that the battery temperature is higher than the first predetermined temperature in the step of determining whether the battery temperature is lower than the first predetermined temperature, The method returns to the controller to increase the speed of the compressor.
18. 18. The control method according to claim 1, wherein the data detection unit includes: A battery temperature sensor configured to measure a battery temperature; a pressure sensor configured to measure a pressure of the refrigerant discharged from the compressor, and A vehicle interior temperature sensor configured to measure a vehicle interior temperature.
19. 19. The control method according to claim 1, Wherein the controller is electrically connected to the heat pump system, and Wherein, the heat pump system includes: A compressor configured to compress an inflow refrigerant; a heating, ventilation and air conditioning (HVAC) module in which an internal condenser and an evaporator connected to a compressor through refrigerant lines are disposed; a heat exchanger connected to the internal condenser through a refrigerant line and configured to condense or evaporate the refrigerant supplied from the internal condenser by heat exchange with air; A first expansion valve disposed on the refrigerant line between the heat exchanger and the evaporator; A refrigerant connection line provided between the compressor and the evaporator, and having a first end connected to the refrigerant line and a second end connected to the refrigerant line between the heat exchanger and the first expansion valve; a cooler provided on the refrigerant connection line and configured to heat-exchange the refrigerant introduced through the refrigerant connection line with the selectively introduced refrigerant to adjust a temperature of the refrigerant; a second expansion valve provided on the refrigerant connection line at an upstream end of the cooler, and And a third expansion valve disposed on the refrigerant line between the internal condenser and the heat exchanger.
20. 20. The control method according to claim 1, Wherein the controller is electrically connected to a cooling device configured to circulate a coolant, and Wherein the cooling device comprises: A valve module configured to control a flow direction of the coolant flowing into the interior; A first line connected to the valve module to selectively flow the coolant, and an electrical component is provided on the first line; A second line having a first end connected to the first line and a second end connected to the valve module to selectively flow the coolant, and a radiator disposed on the second line; A third line connected to the valve module to selectively flow the coolant, an The battery is arranged on the third pipeline; a fourth line having a first end connected to the valve module to selectively flow the coolant and a second end connected to the third line; A fifth line having a first end connected to the valve module to selectively flow a coolant, the cooler being disposed at a second end; a sixth line having a first end connected to the first line at a location where the first line is connected to the second line and a second end connected to the cooler to selectively flow the coolant, and A seventh line, the first end being connected to the third line at a location where the third line is connected to the fourth line, the second end being connected to the cooler to selectively flow the coolant.

Description

Control method for heat pump system for vehicle Technical Field The present disclosure relates to a control method of a heat pump system for a vehicle, and more particularly, to a control method of a heat pump system for a vehicle capable of improving heating efficiency by controlling a temperature of a battery while efficiently recovering heat energy generated from the battery. Background In general, an air conditioning system for a vehicle includes an air conditioner unit that circulates a refrigerant to heat or cool the interior of the vehicle. The air conditioner unit is for maintaining the temperature of the interior of the vehicle at an appropriate level regardless of the change in the external temperature to maintain a comfortable interior environment, and is configured to heat or cool the interior of the vehicle by exchanging heat with the evaporator through the condenser during circulation of the refrigerant discharged by the driving of the compressor back to the compressor through the condenser, the receiver drier, the expansion valve and the evaporator. That is, in the summer cooling mode, the air conditioner unit reduces the temperature and humidity of the inside by condensing the high-temperature and high-pressure vapor-phase refrigerant compressed from the compressor by the condenser, passing the refrigerant through the receiver drier and the expansion valve, and then evaporating the refrigerant in the evaporator. On the other hand, in recent years, as attention has been paid to energy efficiency and environmental pollution problems, development of an environmentally friendly vehicle capable of substantially replacing an internal combustion engine vehicle has been demanded, and the environmentally friendly vehicle is classified into an electric vehicle driven using a fuel cell or electric power as a power source and a hybrid vehicle driven using an engine and an electric storage battery. Among these eco-vehicles, an electric vehicle or a hybrid vehicle does not use a separate heater like an air conditioner of a general vehicle, and an air conditioner used in an eco-vehicle is generally called a heat pump system. On the other hand, since a large amount of heat is generated in the battery and the drive motor, which are main power sources of the electric vehicle, and the electric components, efficient cooling is required, so efficient temperature management of the electric components and the battery may be a very important issue. In addition, since the battery performs optimally at a preset temperature, it is required to heat up to the preset temperature rapidly at the initial stage of running. In the past, separate cooling systems have been used to regulate the temperature of the electrical components and the battery, but this requires a corresponding increase in the capacity of the cooling system, resulting in space constraints. In addition, as the cooling system capacity increases, the power required to operate the cooling system also increases. Further, in the past, in the case where it was necessary to cool the battery when heating the vehicle interior, even if the waste heat of the battery is sufficient, it was necessary to switch the heat pump system to a mode for cooling the battery by using a coolant that exchanges heat with the refrigerant, which may result in a decrease in power consumption efficiency and heating performance. Further, when switching from the heating mode to the mode for cooling the battery by using the coolant heat-exchanged with the refrigerant in order to cool the battery, a delay time is caused by the stop operation of the compressor, so that the cooling of the battery is temporarily interrupted, which may cause difficulty in efficient temperature management of the battery. Therefore, in order to prevent a decrease in power consumption efficiency of an electric vehicle, ensure durability of a battery and maximize energy efficiency, it is necessary to develop a technique of controlling a temperature of the battery and efficiently using waste heat generated from the battery. The above information disclosed in this background section is only for enhancement of understanding of the background of the disclosure and therefore it may contain information that does not form the prior art that is already known in the country to a person of ordinary skill in the art. Disclosure of Invention The present disclosure attempts to provide a control method of a heat pump system for a vehicle, which improves heating efficiency by efficiently recovering heat energy generated from a battery while adjusting the temperature of the battery. A control method of a heat pump system for a vehicle includes (A) when a user operates a heating mode for heating the inside of the vehicle, a controller circulating coolant to an electric part and a cooler, and while controlling the operation of the heat pump system, determining whether a battery temperature is higher than or equal to a first predeterm