Control method and system for refrigerant storage of vehicle, vehicle and readable storage medium

Abstract

The invention discloses a control method and system for refrigerant storage of a vehicle, the vehicle and a readable storage medium, and belongs to the technical field of vehicles. The control method comprises the steps that in response to a starting instruction of independent refrigeration of a passenger compartment, a battery pressure balance valve is controlled to be opened, a battery electronic expansion valve is controlled to be closed, and a refrigerant is driven to flow from a cooling loop of the passenger compartment to a cooling loop of a power battery; according to the actual extraction duration of the refrigerant and the high-pressure value of the compressor, whether extraction of the refrigerant is stopped or not is judged; if yes, a battery pressure balance valve is closed, the opening degree of a battery electronic expansion valve is adjusted to a first preset opening degree, and the refrigerant is stored in a cooling loop of the power battery; and according to the actual storage duration of the refrigerant, the superheat degree of the passenger compartment evaporator outlet and the refrigerant saturation temperature of the compressor outlet, whether storage of the refrigerant is stopped or not is judged. According to the invention, the amount of the refrigerant in the cooling loop of the passenger compartment can be adjusted, and the problems of overhigh pressure and overlarge energy consumption caused by excess refrigerant can be solved.

Description

Technical Field

[0001] The present application belongs to the field of vehicle technology, and specifically relates to a control method and system for refrigerant storage in a vehicle, a vehicle, and a readable storage medium. Background Art

[0002] As the new energy vehicle industry continues to increase its requirements for thermal management performance, direct-cooled power batteries have emerged. Among them, the integration of the direct-cooled power battery thermal management system and the passenger compartment refrigeration system has achieved a high degree of integration of the thermal management of the entire vehicle. However, when the vehicle is in the state of separate refrigeration of the passenger compartment, due to the different optimal refrigeration capacity required for the passenger compartment under different refrigeration modes, that is, the amount of refrigerant required for different refrigeration capacities of the passenger compartment is different, the total amount of refrigerant used for passenger compartment refrigeration in the refrigerant direct-cooled battery thermal management system generally exceeds the actual amount of refrigerant required, and the excess refrigerant occupies the space inside the compressor, reducing the effective compression volume, thereby increasing the pressure and energy consumption of the system. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a control method, system, vehicle and readable storage medium for refrigerant storage of a vehicle, which are applied to new energy vehicles and can adjust the refrigerant amount in the cooling circuit of the passenger compartment when the vehicle is in a state of separate cooling of the passenger compartment, that is, temporarily store part of the refrigerant in the power battery, thereby solving the problems of excessive pressure and excessive energy consumption caused by excess refrigerant.

[0004] In order to solve the above technical problems, this application is implemented as follows: In a first aspect, an embodiment of the present application provides a method for controlling refrigerant storage of a vehicle, the method comprising: In response to the start command of the passenger compartment independent cooling, the battery pressure balance valve is controlled to open and the battery electronic expansion valve is closed, so as to drive the refrigerant to flow from the cooling circuit of the passenger compartment to the cooling circuit of the power battery; Determine whether to stop extracting refrigerant based on the actual extraction time of the refrigerant and the high pressure value of the compressor; If yes, close the battery pressure balance valve, adjust the opening of the battery electronic expansion valve to a first preset opening, and store the refrigerant in the cooling circuit of the power battery; Whether to stop storing the refrigerant is determined based on the actual storage time of the refrigerant, the superheat at the passenger compartment evaporator outlet, and the refrigerant saturation temperature at the compressor outlet.

[0005] In some embodiments, the step of determining whether to stop the extraction of refrigerant based on the actual extraction time of the refrigerant and the high-pressure value of the compressor specifically includes: stopping the extraction of the refrigerant when the actual extraction time is less than the preset extraction time and the high-pressure value is greater than or equal to the preset pressure threshold, and / or when the actual extraction time is greater than or equal to the preset extraction time and the high-pressure value is less than the preset pressure threshold.

[0006] In some embodiments, the step of determining whether to stop refrigerant storage is based on the actual storage time of the refrigerant, the superheat at the passenger compartment evaporator outlet, and the refrigerant saturation temperature at the compressor outlet, specifically includes: when the actual storage time is less than the preset storage time, the superheat is less than the preset first superheat threshold, and the refrigerant saturation temperature is less than the preset refrigerant saturation temperature threshold, and / or when the actual storage time is greater than or equal to the preset storage time, closing the battery electronic expansion valve to stop refrigerant storage.

[0007] In some embodiments, before the step of determining whether to stop the storage of the refrigerant based on the actual storage time of the refrigerant, the superheat of the passenger compartment evaporator outlet and the refrigerant saturation temperature of the compressor outlet, the step also includes: collecting ambient temperature information, determining a temperature reference value based on the ambient temperature information; superimposing the temperature reference value with the preset temperature floating value to obtain a preset refrigerant saturation temperature threshold.

[0008] In some embodiments, after the step of determining whether to stop storage of the refrigerant based on actual storage time of the refrigerant, superheat at the passenger compartment evaporator outlet and refrigerant saturation temperature at the compressor outlet, the step further includes: if storage of the refrigerant is stopped, determining whether to release the refrigerant to the cooling circuit of the passenger compartment based on the opening and superheat of the passenger compartment evaporator electronic expansion valve.

[0009] In some embodiments, if the storage of refrigerant is stopped, the step of determining whether to release the refrigerant to the cooling circuit of the passenger compartment based on the opening and superheat of the passenger compartment evaporator electronic expansion valve specifically includes: when the opening of the passenger compartment evaporator electronic expansion valve is greater than or equal to a preset opening threshold, and the superheat is greater than a preset second superheat threshold, collecting the duration during which the opening and superheat of the passenger compartment evaporator electronic expansion valve meet the corresponding threshold conditions; determining whether to release the stored refrigerant to the cooling circuit of the passenger compartment based on the duration and the preset duration; if the duration is greater than the preset duration, opening the battery pressure balance valve to release the stored refrigerant to the cooling circuit of the passenger compartment; if the duration is less than the preset duration, maintaining the storage state of the refrigerant.

[0010] In some embodiments, if the duration is greater than a preset duration, the battery pressure balance valve is opened to release the stored refrigerant to the cooling circuit of the passenger compartment. After the step, it also includes: when the superheat is less than or equal to a preset third superheat threshold, the stored refrigerant is stopped from being released to the cooling circuit of the passenger compartment and the battery pressure balance valve is closed.

[0011] Compared with the prior art, the above technical solution provided by the present application at least includes the following technical effects: The present application provides a control method, system, vehicle and readable storage medium for refrigerant storage of a vehicle. The control method provided by the present application can adjust the refrigerant amount of the cooling circuit of the passenger compartment when the vehicle is in a state of cooling the passenger compartment alone, that is, temporarily store part of the refrigerant inside the power battery, which can solve the problem of excessive pressure and excessive energy consumption caused by excess refrigerant. After this part of the refrigerant is temporarily stored inside the power battery, it does not participate in subsequent heat exchange, which can release space inside the compressor and reduce the pressure and energy consumption of the refrigerant direct cooling battery thermal management system.

[0012] In a second aspect, an embodiment of the present application provides a control system for refrigerant storage of a vehicle, and the refrigerant storage is controlled according to the control method for refrigerant storage of a vehicle according to the first aspect. The system includes: A refrigerant extraction control module, which is used to control the battery pressure balance valve to open and the battery electronic expansion valve to close in response to a start instruction for independent cooling of the passenger compartment, so as to drive the refrigerant to flow from the cooling circuit of the passenger compartment to the cooling circuit of the power battery; A refrigerant extraction stop module is used to determine whether to stop the extraction of refrigerant based on the actual extraction time of the refrigerant and the high pressure value of the compressor; The refrigerant storage control module, if yes, closes the battery pressure balance valve, adjusts the opening of the battery electronic expansion valve to a first preset opening, and stores the refrigerant in the cooling circuit of the power battery; The refrigerant storage stop module is used to determine whether to stop the storage of the refrigerant based on the actual storage time of the refrigerant, the superheat at the passenger compartment evaporator outlet and the refrigerant saturation temperature at the compressor outlet.

[0013] In a third aspect, an embodiment of the present application provides a vehicle, comprising a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein when the program or instruction is executed by the processor, a method for controlling refrigerant storage of a vehicle as in the first aspect is implemented.

[0014] In a fourth aspect, an embodiment of the present application provides a readable storage medium, on which a program or instruction is stored, and when the program or instruction is executed by a processor, the steps of the control method for refrigerant storage of a vehicle as in the first aspect are implemented.

[0015] It can be understood that the beneficial effects of the technical solutions provided in the second, third and fourth aspects can be found in the relevant description of the first aspect, and will not be repeated here.

[0016] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a flow chart of a method for controlling refrigerant storage of a vehicle provided by some embodiments of the present application; Figure 2 It is a structural block diagram of a control system for refrigerant storage of a vehicle provided by some embodiments of the present application; Figure 3 It is a vehicle structure block diagram provided by some embodiments of the present application. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here. In addition, the "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally represents that the objects associated with each other are in an "or" relationship.

[0020] The following is combined with Figure 1 , the control method of refrigerant storage of a vehicle provided in an embodiment of the present application is described in detail through specific embodiments and application scenarios.

[0021] like Figure 1 As shown, a flow chart of a method for controlling refrigerant storage of a vehicle provided in an embodiment of the present application, the control method comprises steps S101 to S104: Step S101: in response to a start instruction for independent cooling of the passenger compartment, controlling the battery pressure balance valve to open and the battery electronic expansion valve to close, driving the refrigerant to flow from the cooling circuit of the passenger compartment to the cooling circuit of the power battery; It should be noted that each step of the embodiment of the present application is mainly implemented by a thermal management control unit (hereinafter referred to as TDU), which is usually responsible for monitoring and adjusting the real-time operating status of various thermal management systems (such as battery thermal management system, passenger compartment thermal management system, etc.) in new energy vehicles, and adjusting the operation of these systems as needed to ensure that the vehicle can maintain the best thermal balance under various working conditions. TDU integrates components such as sensors, controllers and actuators, collects parameter information such as temperature, pressure, flow, and makes judgments and decisions based on its internal preset algorithms and logic, thereby realizing precise control of the thermal management system of the whole vehicle. For example, TDU can collect data from various sensors, such as temperature sensors, pressure sensors and flow sensors, etc., including but not limited to the temperature of the power battery, the temperature in the passenger compartment, the ambient temperature, the pressure value on the high-pressure side of the compressor, and the refrigerant flow; TDU can control various valves to balance pressure and adjust the refrigerant flow as needed based on the collected data, including but not limited to the battery pressure balancing valve, the battery electronic expansion valve and the passenger compartment evaporator electronic expansion valve; TDU can also control the operation of various components, including but not limited to compressors, evaporators and cooling fans. The above-mentioned functions of TDU are conventional settings in the field of thermal management of new energy vehicles and will not be elaborated here.

[0022] In this embodiment, in response to the start command of the passenger compartment cooling alone, that is, when the vehicle is in a state where only the passenger compartment needs cooling and does not involve the cooling of the power battery, after the TDU controls the compressor and the cooling fan to work, in order to drive the refrigerant from the cooling circuit of the passenger compartment to the cooling circuit of the power battery to achieve a balanced distribution of the internal pressure of the system, and to prevent the occurrence of unexpected situations such as pipeline rupture or compressor damage caused by pressure imbalance, the TDU controls the battery pressure balance valve to open and puts the battery pressure balance valve in a fully open state, effectively balancing the pressure inside the refrigerant direct cooling battery thermal management system during the extraction of the refrigerant, and preventing the system overpressure risk caused by excessive pressure on one side of the compressor during the extraction of the refrigerant. At the same time, in this process, it should be avoided that the refrigerant flows into the power battery in advance during the extraction of the refrigerant, which affects the subsequent judgment of whether to stop the extraction of the refrigerant. Through the above control logic, part of the refrigerant in the cooling circuit of the passenger compartment can be extracted, releasing the space inside the compressor, increasing the effective compression volume, thereby reducing the pressure and energy consumption of the refrigerant direct cooling battery thermal management system.

[0023] Step S102: judging whether to stop extracting the refrigerant according to the actual extraction time of the refrigerant and the high pressure value of the compressor; In this embodiment, when the extraction of refrigerant begins, that is, when the refrigerant begins to flow from the cooling circuit of the passenger compartment to the cooling circuit of the power battery, the TDU starts timing until the threshold condition for stopping the extraction of refrigerant is triggered, and the timing ends to obtain the actual extraction time of the refrigerant. During the extraction of the refrigerant, the TDU continuously monitors the pressure value on the high-pressure side of the compressor to obtain the high-pressure pressure value. Real-time monitoring by the TDU can ensure that the flow of refrigerant is in a controlled state, so that the cooling demand of the passenger compartment is met while avoiding a sudden increase in the temperature of the passenger compartment due to excessive extraction of refrigerant, which affects the comfort experience of the passengers.

[0024] In some embodiments, the step of determining whether to stop the extraction of refrigerant based on the actual extraction time of the refrigerant and the high-pressure value of the compressor specifically includes: stopping the extraction of the refrigerant when the actual extraction time is less than the preset extraction time and the high-pressure value is greater than or equal to the preset pressure threshold, and / or when the actual extraction time is greater than or equal to the preset extraction time and the high-pressure value is less than the preset pressure threshold.

[0025] In this embodiment, the preset extraction time can be 100s, and the preset pressure threshold can be 3.5Mpa. When the actual extraction time of the refrigerant has not reached the preset time, but the high pressure value of the compressor has reached or exceeded the preset pressure threshold, the high pressure value may mean that the pressure in the refrigerant direct cooling battery thermal management system has exceeded the safe range. Continuing to extract the refrigerant will increase the risk of system overpressure, which may cause damage to the compressor or other components. At this time, the extraction of the refrigerant should be stopped immediately. When the actual extraction time has reached or exceeded the preset extraction time, and the high pressure value is less than the preset pressure threshold, it indicates that the refrigerant has been effectively extracted and the pressure in the refrigerant direct cooling battery thermal management system is within the safe range. Ending the extraction of the refrigerant can prevent excessive extraction of the refrigerant and avoid insufficient refrigerant when cooling the passenger compartment. When the actual extraction time and the high pressure value do not meet the above conditions, the refrigerant will continue to flow from the cooling circuit of the passenger compartment to the cooling circuit of the power battery. The extracted refrigerant does not participate in heat exchange, which can effectively reduce the excessive pressure and energy consumption of the refrigerant direct-cooling battery thermal management system caused by excess refrigerant when the vehicle only needs to cool the passenger compartment.

[0026] Step S103: If yes, close the battery pressure balance valve, adjust the opening of the battery electronic expansion valve to a first preset opening, and store the refrigerant in the cooling circuit of the power battery; In this embodiment, the opening of the battery electronic expansion valve can range from 0 to 600, and the first preset opening can be 100. When the extraction of the refrigerant is stopped, closing the battery pressure balance valve can isolate the cooling circuit of the passenger compartment and the cooling circuit of the power battery, preventing the refrigerant from flowing freely between the two cooling circuits during the storage of the refrigerant in the cooling circuit of the power battery, while ensuring the stability of the pressure in the cooling circuit of the power battery. Adjusting the opening of the battery electronic expansion valve to the first preset opening can accurately control the refrigerant flow rate entering the cooling circuit of the power battery. Among them, the first preset opening is optimized to ensure that the flow speed of the refrigerant in the cooling circuit of the power battery is moderate, which is conducive to storing the refrigerant in the cooling circuit of the power battery and avoiding excessive pressure or other problems caused by the entry of excessive refrigerant. In this way, it can be ensured that the pressure and flow of the power battery cooling circuit are within a controllable range during the storage of the refrigerant in the cooling circuit of the power battery.

[0027] Step S104: Determine whether to stop storing the refrigerant based on the actual storage time of the refrigerant, the superheat at the passenger compartment evaporator outlet, and the refrigerant saturation temperature at the compressor outlet.

[0028] In this embodiment, when the refrigerant starts to be stored in the cooling circuit of the power battery, the TDU starts timing until the threshold condition for stopping the storage of the refrigerant is triggered and the timing ends, and the actual storage time of the refrigerant is obtained. During the storage of the refrigerant, the TDU continuously monitors the superheat at the outlet of the passenger compartment evaporator and the refrigerant saturation temperature at the outlet of the compressor. The superheat at the outlet of the passenger compartment evaporator refers to the difference between the temperature of the refrigerant when it leaves the evaporator and its saturation temperature. The monitoring of superheat can help determine the evaporation of the refrigerant in the evaporator. Too low superheat may cause wet compression and damage the compressor. The refrigerant saturation temperature at the outlet of the compressor refers to the temperature when the refrigerant is in a liquid and gaseous equilibrium state. In this state, the liquid and gaseous states of the refrigerant can coexist, and there is a clear correspondence between the refrigerant saturation temperature and pressure. Monitoring this temperature can help determine the state of the refrigerant in the compressor. If the refrigerant saturation temperature is too low, it may mean that the system pressure is too low and the refrigerant flow is insufficient, affecting the refrigeration effect. In addition, too low refrigerant saturation temperature may cause liquid components to be contained in the refrigerant, increasing the risk of wet compression. Therefore, it is also necessary to determine whether to stop storing the refrigerant based on the superheat at the passenger compartment evaporator outlet and the refrigerant saturation temperature at the compressor outlet.

[0029] In some embodiments, the step of determining whether to stop refrigerant storage is based on the actual storage time of the refrigerant, the superheat at the passenger compartment evaporator outlet, and the refrigerant saturation temperature at the compressor outlet, specifically includes: when the actual storage time is less than the preset storage time, the superheat is less than the preset first superheat threshold, and the refrigerant saturation temperature is less than the preset refrigerant saturation temperature threshold, and / or when the actual storage time is greater than or equal to the preset storage time, closing the battery electronic expansion valve to stop refrigerant storage.

[0030] In this embodiment, the preset storage time may be 120s, and the preset first superheat threshold may be 6°C. When the superheat at the passenger compartment evaporator outlet is less than the preset first superheat threshold, it indicates that the refrigerant is not completely evaporated when leaving the evaporator, which may cause wet compression and reduce the efficiency of the compressor. When the refrigerant saturation at the compressor outlet is less than the preset refrigerant saturation temperature threshold, the refrigerant saturation temperature is too low, which may mean that the system pressure is too low. The system pressure is too low, which will reduce the working efficiency of the compressor and increase the energy consumption of the compressor. At the same time, long-term low-pressure operation may cause overheating and damage to the compressor and other components. Therefore, when the actual storage time of the refrigerant has not reached the preset time, the superheat at the passenger compartment evaporator outlet and the refrigerant saturation temperature at the compressor outlet meet the corresponding threshold conditions, the TDU controls the battery electronic expansion valve to close to stop the storage of the refrigerant. When the actual storage time has reached or exceeded the preset storage time, it indicates that the refrigerant has been stored in the cooling circuit of the power battery, and the TDU controls the battery electronic expansion valve to close to stop the storage of the refrigerant. When the actual storage time of the refrigerant, the superheat at the passenger compartment evaporator outlet, and the refrigerant saturation temperature at the compressor outlet do not meet the above conditions, the storage of the refrigerant will not be stopped. The preset storage time, the preset first superheat threshold, and the preset refrigerant saturation temperature threshold can be determined according to specific design requirements, operating conditions, safety margins, and performance target requirements.

[0031] In some embodiments, before the step of determining whether to stop the storage of the refrigerant based on the actual storage time of the refrigerant, the superheat of the passenger compartment evaporator outlet and the refrigerant saturation temperature of the compressor outlet, the step also includes: collecting ambient temperature information, determining a temperature reference value based on the ambient temperature information; superimposing the temperature reference value with the preset temperature floating value to obtain a preset refrigerant saturation temperature threshold.

[0032] In this embodiment, by collecting ambient temperature information, the changes in the external ambient temperature of the vehicle can be understood in real time. When the ambient temperature is greater than 30°C but not more than 38°C, the temperature reference value may be 30°C. When the ambient temperature is greater than 38°C, the temperature reference value may be 38°C. The preset temperature floating value may be 30°C, which is usually determined based on the characteristics of the system and the safety margin, and is used to determine whether the saturation temperature of the refrigerant at the compressor outlet is within a normal range. Dynamically adjusting the refrigerant saturation temperature threshold according to the ambient temperature helps optimize the energy efficiency of the refrigerant direct-cooled battery thermal management system and improve the overall performance of the system.

[0033] In some embodiments, after the step of determining whether to stop storage of the refrigerant based on actual storage time of the refrigerant, superheat at the passenger compartment evaporator outlet and refrigerant saturation temperature at the compressor outlet, the step further includes: if storage of the refrigerant is stopped, determining whether to release the refrigerant to the cooling circuit of the passenger compartment based on the opening and superheat of the passenger compartment evaporator electronic expansion valve.

[0034] In this embodiment, part of the refrigerant in the passenger compartment cooling circuit has been temporarily stored in the power battery cooling circuit. When the passenger compartment needs refrigerant, the refrigerant stored in the power battery can be released to the passenger compartment cooling circuit. The passenger compartment cooling demand can be determined based on the opening and superheat of the passenger compartment evaporator electronic expansion valve.

[0035] In some embodiments, if the storage of the refrigerant is stopped, the step of determining whether to release the refrigerant to the cooling circuit of the passenger compartment based on the opening and superheat of the passenger compartment evaporator electronic expansion valve specifically includes: when the opening of the passenger compartment evaporator electronic expansion valve is greater than or equal to a preset opening threshold, and the superheat is greater than a preset second superheat threshold, collecting the duration during which the opening and superheat of the passenger compartment evaporator electronic expansion valve meet the corresponding threshold conditions; determining whether to release the stored refrigerant to the cooling circuit of the passenger compartment based on the duration and the preset duration; if the duration is greater than the preset duration, opening the battery pressure balance valve to release the stored refrigerant to the cooling circuit of the passenger compartment; if the duration is less than the preset duration, maintaining the storage state of the refrigerant.

[0036] In this embodiment, the preset opening threshold may be 350, the preset second superheat threshold may be 8°C, and the preset duration may be 20s. After stopping the storage of the refrigerant, when the opening of the electronic expansion valve of the passenger compartment evaporator is greater than or equal to the preset opening threshold, it indicates that the refrigeration demand of the passenger compartment has increased, and more refrigerant is currently needed to meet the refrigeration demand. And the superheat at the evaporator outlet is greater than the preset second superheat threshold, indicating that the refrigerant at the evaporator outlet has completely evaporated, and the passenger compartment may need more refrigerant to meet the refrigeration demand. When the above conditions are met, the TDU starts timing and records the duration of the opening and superheat of the electronic expansion valve of the passenger compartment evaporator meeting the corresponding threshold conditions. According to the duration and the preset duration, it is determined whether to release the stored refrigerant to the cooling circuit of the passenger compartment. Since the cooling demand of the passenger compartment changes at this time, the passenger compartment evaporator electronic expansion valve will adjust its opening according to the information fed back by the sensor to maintain the superheat at a set target value. This process usually takes a certain amount of time. In order to prevent misoperation, the stored refrigerant will be released to the cooling circuit of the passenger compartment only when the duration of the above two conditions is greater than or equal to the preset duration. When the above two conditions are not met or the duration is less than the preset duration, the system will continue to maintain the storage state of the refrigerant and will not release additional refrigerant. Among them, the preset opening threshold, the preset second superheat threshold and the preset duration can be determined according to specific design requirements, operating conditions, safety margins and performance target requirements.

[0037] In some embodiments, if the duration is greater than a preset duration, the battery pressure balance valve is opened to release the stored refrigerant to the cooling circuit of the passenger compartment. After the step, it also includes: when the superheat is less than or equal to a preset third superheat threshold, the stored refrigerant is stopped from being released to the cooling circuit of the passenger compartment and the battery pressure balance valve is closed.

[0038] In this embodiment, the preset third superheat threshold value can be a preset target superheat plus an allowable deviation value. The preset target superheat can be 8°C, and the deviation value can be 4°C. When the TDU detects that the superheat at the passenger compartment evaporator outlet is less than or equal to the third superheat threshold value, it means that the ideal cooling effect has been approached or reached. At this time, there is no need to release refrigerant to the passenger compartment. The TDU completely closes the battery pressure balance valve, that is, the opening of the power battery balance valve is adjusted to 0, which can maintain the pressure on the high-pressure side of the compressor and prevent the refrigerant from flowing unnecessarily, thereby maintaining the pressure balance in the cooling circuit. When the superheat at the passenger compartment evaporator outlet does not meet the above threshold conditions, the stored refrigerant continues to be released to the cooling circuit of the passenger compartment.

[0039] It should be noted that, in some embodiments, the control method of the refrigerant storage of the vehicle in the embodiment of the present application can effectively reduce the pressure and energy consumption of the refrigerant direct cooling battery thermal management system. When the initial system pressure is 2600kpa, the system pressure is reduced to 1500kpa, the exhaust pressure of the compressor is reduced to 1100kpa, and the energy consumption is optimized by 400-500W.

[0040] like Figure 2 As shown, an embodiment of the present application provides a structural block diagram of a control system for refrigerant storage of a vehicle, the system comprising: The refrigerant extraction control module 201 is used to control the battery pressure balance valve to open and the battery electronic expansion valve to close in response to the start-up instruction of the passenger compartment independent cooling, so as to drive the refrigerant to flow from the cooling circuit of the passenger compartment to the cooling circuit of the power battery; The refrigerant extraction stop module 202 is used to determine whether to stop the extraction of the refrigerant according to the actual extraction time of the refrigerant and the high pressure value of the compressor; The refrigerant storage control module 203 is used to stop the extraction of the refrigerant, close the battery pressure balance valve, adjust the opening of the battery electronic expansion valve to a first preset opening, and store the refrigerant in the cooling circuit of the power battery; The refrigerant storage stopping module 204 is used to determine whether to stop the storage of the refrigerant according to the actual storage time of the refrigerant, the superheat degree at the passenger compartment evaporator outlet and the refrigerant saturation temperature at the compressor outlet.

[0041] The control system of the vehicle air conditioner in the embodiment of the present application can be a device, or a component, integrated circuit, or chip in a terminal. The device can be a mobile electronic device or a non-mobile electronic device. For example, the mobile electronic device can be a mobile phone, a tablet computer, a laptop computer, a PDA, a vehicle-mounted electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA), etc. The non-mobile electronic device can be a server, a network attached storage (NAS), or a personal computer (PC), etc., which is not specifically limited in the embodiment of the present application.

[0042] The control system for the refrigerant storage of the vehicle provided in the embodiment of the present application can achieve Figure 1 In order to avoid repetition, the various processes implemented by the control system for refrigerant storage of the vehicle in the method embodiment will not be described again here.

[0043] Alternatively, if Figure 3As shown, an embodiment of the present application also provides a vehicle, including a processor 301, a memory 302, and a program or instruction 303 stored in the memory and executable on the processor. When the program or instruction is executed by the processor, each process of the control method embodiment of the refrigerant storage of the above-mentioned vehicle is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0044] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, each process of the control method for refrigerant storage of the above-mentioned vehicle is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0045] The processor is the processor in the vehicle in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0046] The embodiment of the present application further provides a chip, which includes a processor and a communication interface. The communication interface and the processor are coupled, and the processor is used to run programs or instructions to implement the various processes of the control method for refrigerant storage of the above-mentioned vehicle, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0047] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0048] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0049] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0050] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A method for controlling refrigerant storage of a vehicle, characterized in that: The method comprises: In response to the start command of the passenger compartment independent cooling, the battery pressure balance valve is controlled to open and the battery electronic expansion valve is closed, so as to drive the refrigerant to flow from the cooling circuit of the passenger compartment to the cooling circuit of the power battery; Determining whether to stop extracting the refrigerant according to the actual extraction time of the refrigerant and the high pressure value of the compressor; If yes, close the battery pressure balance valve, adjust the opening of the battery electronic expansion valve to a first preset opening, so that the refrigerant is stored in the cooling circuit of the power battery; Whether to stop storing the refrigerant is determined according to the actual storage time of the refrigerant, the superheat at the passenger compartment evaporator outlet, and the refrigerant saturation temperature at the compressor outlet.

2. The control method according to claim 1, characterized in that: The step of determining whether to stop extracting the refrigerant according to the actual extraction time of the refrigerant and the high pressure value of the compressor specifically includes: When the actual extraction time is less than the preset extraction time and the high-pressure pressure value is greater than or equal to the preset pressure threshold, and / or when the actual extraction time is greater than or equal to the preset extraction time and the high-pressure pressure value is less than the preset pressure threshold, stop extracting the refrigerant.

3. The control method according to claim 1, characterized in that: The step of determining whether to stop storing the refrigerant according to the actual storage time of the refrigerant, the superheat at the passenger compartment evaporator outlet, and the refrigerant saturation temperature at the compressor outlet specifically includes: When the actual storage time is less than the preset storage time, the superheat is less than the preset first superheat threshold, and the refrigerant saturation temperature is less than the preset refrigerant saturation temperature threshold, and / or when the actual storage time is greater than or equal to the preset storage time, the battery electronic expansion valve is closed to stop the storage of the refrigerant.

4. The control method according to claim 3, characterized in that: Before the step of determining whether to stop storing the refrigerant according to the actual storage time of the refrigerant, the superheat at the passenger compartment evaporator outlet, and the refrigerant saturation temperature at the compressor outlet, the method further includes: Collecting ambient temperature information, and determining a temperature reference value according to the ambient temperature information; The temperature reference value is superimposed on the preset temperature floating value to obtain the preset refrigerant saturation temperature threshold.

5. The control method according to claim 1, characterized in that: After the step of determining whether to stop storing the refrigerant according to the actual storage time of the refrigerant, the superheat at the passenger compartment evaporator outlet, and the refrigerant saturation temperature at the compressor outlet, the method further includes: If the storage of the refrigerant is stopped, it is determined whether to release the refrigerant to the cooling circuit of the passenger compartment according to the opening degree of the electronic expansion valve of the passenger compartment evaporator and the superheat degree.

6. The control method according to claim 5, characterized in that: If the storage of the refrigerant is stopped, the step of determining whether to release the refrigerant to the cooling circuit of the passenger compartment according to the opening of the electronic expansion valve of the passenger compartment evaporator and the superheat degree specifically includes: When the opening of the electronic expansion valve of the passenger compartment evaporator is greater than or equal to a preset opening threshold, and the superheat is greater than a preset second superheat threshold, collecting the duration of the opening of the electronic expansion valve of the passenger compartment evaporator and the superheat satisfying the corresponding threshold conditions; Determining whether to release the refrigerant to the cooling circuit of the passenger compartment according to the duration and a preset duration; If the duration is longer than the preset duration, opening the battery pressure balance valve to release the stored refrigerant to the cooling circuit of the passenger compartment; If the duration is shorter than the preset duration, the storage state of the refrigerant is maintained.

7. The control method according to claim 6, characterized in that: After the step of opening the battery pressure balance valve to release the stored refrigerant to the cooling circuit of the passenger compartment if the duration is greater than the preset duration, the method further includes: When the degree of superheat is less than or equal to a preset third superheat threshold, the release of the stored refrigerant to the cooling circuit of the passenger compartment is stopped, and the battery pressure balance valve is closed.

8. A system for controlling refrigerant storage in a vehicle, characterized in that: The system comprises: A refrigerant extraction control module, which is used to control the battery pressure balance valve to open and the battery electronic expansion valve to close in response to a start instruction for independent cooling of the passenger compartment, so as to drive the refrigerant to flow from the cooling circuit of the passenger compartment to the cooling circuit of the power battery; A refrigerant extraction stop module, used to determine whether to stop the extraction of the refrigerant according to the actual extraction time of the refrigerant and the high pressure value of the compressor; A refrigerant storage control module, used for, when the extraction of the refrigerant is stopped, closing the battery pressure balance valve, adjusting the opening of the battery electronic expansion valve to a first preset opening, so that the refrigerant is stored in the cooling circuit of the power battery; The refrigerant storage stop module is used to determine whether to stop the storage of the refrigerant according to the actual storage time of the refrigerant, the superheat at the passenger compartment evaporator outlet and the refrigerant saturation temperature at the compressor outlet.

9. A vehicle, characterized in that: The invention comprises a processor, a memory and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements a control method for refrigerant storage of a vehicle as claimed in any one of claims 1 to 7.

10. A readable storage medium, characterized in that: The readable storage medium stores a program or instruction, and when the program or instruction is executed by the processor, the steps of the control method for refrigerant storage of a vehicle as described in any one of claims 1 to 7 are implemented.

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