Control method for electronic expansion valve of vehicle refrigerating system and electronic equipment

Abstract

The invention discloses a vehicle refrigeration system electronic expansion valve control method and electronic equipment. The vehicle refrigerating system electronic expansion valve control method comprises the steps that the current refrigerating mode of a refrigerating system is obtained; according to the current refrigeration mode, the step number of the first electronic expansion valve is controlled; and according to the current refrigeration mode, the step number of the second electronic expansion valve is controlled. According to different refrigeration modes of the refrigeration system, the step number of the first electronic expansion valve and the step number of the second electronic expansion valve are controlled, and therefore the flow of cooling liquid entering the air conditioner evaporator and the flow of cooling liquid entering the battery cold plate are jointly controlled according to the characteristics of the different refrigeration modes; the precise refrigeration requirements of the air conditioner evaporator and the battery in different refrigeration modes are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, and particularly relates to a vehicle refrigeration system electronic expansion valve control method, electronic equipment, a storage medium and a computer program product. BACKGROUND

[0002] The existing refrigeration system in the vehicle drives the cooling liquid to flow between the condenser, the evaporator and the battery cold plate through the compressor. The flow speed of the cooling liquid is adjusted by controlling the rotating speed of the compressor to meet the temperature requirements of different elements.

[0003] However, in the existing refrigeration system, the first electronic expansion valve controlling the cooling liquid into the air conditioner and the second electronic expansion valve controlling the cooling liquid into the battery cold plate are not distinguished according to different refrigeration modes. For different refrigeration modes, the same control logic is used to control the electronic expansion valve, which cannot well adapt to the requirements of different refrigeration modes and the control precision is insufficient. SUMMARY

[0004] Therefore, it is necessary to provide a vehicle refrigeration system electronic expansion valve control method, electronic equipment, a storage medium and a computer program product to solve the technical problem that the existing technology uses the same control logic to control the electronic expansion valve for different refrigeration modes, which cannot well adapt to the requirements of different refrigeration modes and the control precision is insufficient.

[0005] The present application provides a vehicle refrigeration system electronic expansion valve control method, the electronic expansion valve includes a first electronic expansion valve and a second electronic expansion valve, the refrigeration system includes a compressor, a condenser, an evaporator and a battery cold plate, the output end of the compressor is connected with the input end of the condenser, the output end of the condenser is connected with the input end of the evaporator through the first electronic expansion valve and connected with the input end of the battery cold plate through the second electronic expansion valve, the output end of the evaporator and the output end of the battery cold plate are connected with the input end of the compressor respectively, and the control method includes the following steps. acquiring a current refrigeration mode of the refrigeration system; controlling the step number of the first electronic expansion valve according to the current refrigeration mode; controlling the step number of the second electronic expansion valve according to the current refrigeration mode.

[0006] Further, the step of controlling the step number of the first electronic expansion valve according to the current refrigeration mode includes the following steps. determining a first electronic expansion valve target upper limit value and a first electronic expansion valve target lower limit value based on the current refrigeration mode; determining an evaporator outlet actual superheat degree, and determining a first electronic expansion valve target step number based on the evaporator superheat degree; if the first electronic expansion valve target step number is less than the first electronic expansion valve target upper limit value and greater than the first electronic expansion valve target lower limit value, then the step number of the first electronic expansion valve is controlled to be the first electronic expansion valve target step number; if the first electronic expansion valve target step number is greater than or equal to the first electronic expansion valve target upper limit value, then the step number of the first electronic expansion valve is controlled to be the first electronic expansion valve target upper limit value; if the first electronic expansion valve target step number is less than or equal to the first electronic expansion valve target lower limit value, then the step number of the first electronic expansion valve is controlled to be the first electronic expansion valve target lower limit value.

[0007] Further, the first electronic expansion valve target upper limit value is determined based on the current refrigeration mode, comprising: obtaining a current battery temperature; when the current battery maximum temperature is greater than or equal to a first forced temperature threshold, setting a forced target upper limit value to a closed default value, or when the current battery maximum temperature is less than or equal to a second forced temperature threshold, setting the forced target upper limit value to a target upper limit maximum value, the first forced temperature threshold being greater than the second forced temperature threshold; obtaining a current ambient temperature and a current compressor speed, and determining a first electronic expansion valve initial target upper limit value corresponding to the current ambient temperature and the current compressor speed in the current refrigeration mode; determining the first electronic expansion valve target upper limit value to be the minimum of the first electronic expansion valve initial target upper limit value and the forced target upper limit value.

[0008] Further, the step number of the first electronic expansion valve is controlled according to the current refrigeration mode, further comprising: when the first electronic expansion valve is initially turned on, obtaining a current ambient temperature, and controlling the step number of the first electronic expansion valve to be an initial step number corresponding to the current ambient temperature within a preset time length.

[0009] Further, the step number of the second electronic expansion valve is controlled according to the current refrigeration mode, comprising: when the current refrigeration mode is an air conditioner single open mode, obtaining a condenser outlet refrigerant pressure at the condenser outlet, and determining a second electronic expansion valve pressure relief target corresponding to the condenser outlet refrigerant pressure; if the battery maximum temperature is greater than a first battery temperature threshold and the battery temperature difference is less than a first temperature difference threshold, then the step number of the second electronic expansion valve is controlled to be the second electronic expansion valve pressure relief target, otherwise the step number of the second electronic expansion valve is controlled to be a closed default value.

[0010] Further, the step of controlling the step number of the second electronic expansion valve according to the current refrigeration mode comprises: when the current refrigeration mode is the double-open mode or the battery single-open mode, determining a second electronic expansion valve target upper limit value and a second electronic expansion valve target lower limit value; determining a battery actual overheat degree, determining a second electronic expansion valve target step number based on the battery overheat degree; if the second electronic expansion valve target step number is less than the second electronic expansion valve target upper limit value and greater than the second electronic expansion valve target lower limit value, controlling the step number of the second electronic expansion valve to be the second electronic expansion valve target step number; if the second electronic expansion valve target step number is greater than or equal to the second electronic expansion valve target upper limit value, controlling the step number of the second electronic expansion valve to be the second electronic expansion valve target upper limit value; if the second electronic expansion valve target step number is less than or equal to the second electronic expansion valve target lower limit value, controlling the step number of the second electronic expansion valve to be the second electronic expansion valve target lower limit value.

[0011] Further, the step of determining the second electronic expansion valve target upper limit value comprises: if the battery temperature is greater than a second battery temperature threshold value or the battery temperature difference is greater than a second temperature difference threshold value, setting a forced target upper limit value to be a target upper limit maximum value, otherwise setting the forced target upper limit value to be a closed default value; obtaining a current environment temperature and a current compressor rotating speed, determining a second electronic expansion valve initial target upper limit value corresponding to the current environment temperature and the current compressor rotating speed; if the current refrigeration mode is the double-open mode, determining a current state based on the current environment temperature, determining an air conditioner priority upper limit value based on the current state and a current battery maximum temperature, and taking a maximum value of the second electronic expansion valve initial target upper limit value and the air conditioner priority upper limit value and the forced target upper limit value as the second electronic expansion valve target upper limit value; if the current refrigeration mode is the battery single-open mode, taking a maximum value of the second electronic expansion valve initial target upper limit value and the forced target upper limit value as the second electronic expansion valve target upper limit value.

[0012] Further, the step of determining the current state based on the current environment temperature, and determining the air conditioner priority upper limit value based on the current state and the current battery maximum temperature comprises: if the current environment temperature is greater than a first ambient temperature threshold value and less than or equal to a second ambient temperature threshold value, determining the current state to be a first state, and if the current environment temperature is greater than a third ambient temperature threshold value and less than or equal to a fourth ambient temperature threshold value, determining the current state to be a second state. In the first state, if the battery maximum temperature is less than a second battery temperature threshold, and the battery temperature difference is less than a second temperature difference threshold, and the vehicle temperature is greater than a vehicle temperature threshold, the air conditioner priority upper limit value is set to a closed default value, otherwise the air conditioner priority upper limit value is set to a target upper limit maximum value; In the second state, if the battery maximum temperature is less than a third battery temperature threshold, and the battery temperature difference is less than a third temperature difference threshold, and the battery temperature control request continuous time is less than a time threshold, and the vehicle temperature is greater than a vehicle temperature threshold, the air conditioner priority upper limit value is set to a closed default value, otherwise the air conditioner priority upper limit value is set to a target upper limit maximum value.

[0013] Further, the determining the battery actual overheat degree, determining a second electronic expansion valve target step number based on the battery overheat degree, comprises: If the second electronic expansion valve current step number is less than a preset step number threshold, increasing the second electronic expansion valve target step number at a preset slope, otherwise determining the battery actual overheat degree, determining a second electronic expansion valve target step number based on the battery overheat degree.

[0014] The present application provides an electronic device, comprising: At least one processor; and, The memory is in communication with the at least one processor; wherein, The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the vehicle refrigeration system electronic expansion valve control method as described above.

[0015] The present application provides a storage medium, which stores computer instructions, when the computer executes the computer instructions, all steps of the vehicle refrigeration system electronic expansion valve control method as described above are executed.

[0016] The present application provides a computer program product, comprising computer programs / instructions, which are executed by a processor to implement the vehicle refrigeration system electronic expansion valve control method as described above.

[0017] The present application controls the step number of the first electronic expansion valve and the second electronic expansion valve according to different refrigeration modes of the refrigeration system, so as to control the flow of cooling liquid entering the air conditioner evaporator and the battery cooling plate according to the characteristics of different refrigeration modes, so as to adapt to the accurate refrigeration requirements of the air conditioner evaporator and the battery under different refrigeration modes. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A vehicle refrigeration system electronic expansion valve control method workflow diagram is provided for an embodiment of the present application; Figure 2A working flow chart of a vehicle refrigeration system electronic expansion valve control method according to another embodiment of the present application; Figure 3 A working flow chart of a vehicle refrigeration system electronic expansion valve control method according to another embodiment of the present application; Figure 4 A system schematic diagram of a vehicle electric compressor system according to the best embodiment of the present application; Figure 5 A working flow chart of a vehicle refrigeration system electronic expansion valve control method according to the best embodiment of the present application; Figure 6 A working flow chart of a vehicle refrigeration system electronic expansion valve control method according to the best embodiment of the present application; Figure 7 The priority logic according to the best embodiment of the present application; Figure 8 A hardware structure schematic diagram of an electronic device according to the present application. DETAILED DESCRIPTION

[0019] The specific embodiments of the present application will be further described below in conjunction with the accompanying drawings. Identical parts are denoted by identical reference numerals in the drawings. It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "inner" and "outer" refer to the directions towards or away from the geometric center of a particular part.

[0020] As Figure 1 shown is a working flow chart of a vehicle refrigeration system electronic expansion valve control method according to an embodiment of the present application, the electronic expansion valve includes a first electronic expansion valve and a second electronic expansion valve, the refrigeration system includes a compressor, a condenser, an evaporator and a battery cold plate, the output end of the compressor is connected to the input end of the condenser, the output end of the condenser is connected to the input end of the evaporator through the first electronic expansion valve and connected to the input end of the battery cold plate through the second electronic expansion valve, the output end of the evaporator and the output end of the battery cold plate are respectively connected to the input end of the compressor, the control method includes: Step S101, obtaining the current refrigeration mode of the refrigeration system; Step S102, controlling the step number of the first electronic expansion valve according to the current refrigeration mode; Step S103, controlling the step number of the second electronic expansion valve according to the current refrigeration mode. Including: Specifically, the present application can be applied to electronic devices with processing capabilities, such as controllers of vehicles, for example, electronic control unit (ECU) of vehicles.

[0021] AsFigure 4 The diagram shown is a system schematic of a vehicle electric compressor system according to the preferred embodiment of the present invention, including: compressor 1, condenser 2, evaporator 3, and battery cold plate 4.

[0022] The compressor 1 is preferably an electric compressor. The output of the compressor 1 is connected to the input of the condenser 2. The output of the condenser 2 is connected to the input of the evaporator 3 and the input of the battery cold plate 4. The outputs of the evaporator 3 and the battery cold plate 4 are connected to the input of the compressor 1, forming a circuit. The output of the condenser 2 is equipped with a refrigerant pressure sensor 21, the output of the evaporator 3 is equipped with a first pressure-temperature sensor 31, and the output of the battery cold plate 4 is equipped with a second pressure-temperature sensor 41. The input of the evaporator 3 is equipped with a first electronic expansion valve 32, and the input of the battery cold plate 4 is equipped with a second electronic expansion valve 42. The evaporator 3 is also equipped with an evaporator temperature sensor 33, and the battery cold plate 4 is equipped with a battery temperature sensor 43. Additionally, an ambient temperature sensor 5 and an interior temperature sensor 6 are also provided.

[0023] Specifically, first execute step S101 to obtain the current cooling mode of the refrigeration system.

[0024] Specifically, the cooling modes include, but are not limited to: air conditioner-only mode, battery-only mode, and dual-mode. Air conditioner-only mode means the refrigerant only enters the evaporator of the air conditioner and not the battery cooling plate. Battery-only mode means the refrigerant only enters the battery cooling plate and not the evaporator. Dual-mode means the refrigerant enters both the evaporator and the battery cooling plate simultaneously. Figure 4 For example, in air conditioner-only mode, the first electronic expansion valve 32 is opened and the second electronic expansion valve 42 is closed. In battery-only mode, the first electronic expansion valve 32 is closed and the second electronic expansion valve 42 is opened. In dual-mode, both the first and second electronic expansion valves are open.

[0025] Then, in step S102, the number of steps of the first electronic expansion valve is controlled according to the current cooling mode; and in step S103, the number of steps of the second electronic expansion valve is controlled according to the current cooling mode.

[0026] In electronic expansion valves, the number of steps typically refers to the number of pulses required for the valve to go from fully closed to fully open. The opening degree of an electronic expansion valve is expressed in steps.

[0027] The prior art is independent of the electronic expansion valve control on the air conditioner side and the electronic expansion valve control on the battery side. Unlike the prior art, the present embodiment controls the step number of the first electronic expansion valve and the step number of the second electronic expansion valve based on different refrigeration modes. Thus, the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve are controlled simultaneously according to different refrigeration modes, and the flow of the cooling liquid into the evaporator and the battery cold plate is changed together to meet the refrigeration requirements of the evaporator and the battery under different refrigeration modes, avoiding the distribution conflict of the cooling liquid caused by separate control.

[0028] The present application controls the step number of the first electronic expansion valve and the step number of the second electronic expansion valve based on different refrigeration modes of the refrigeration system, so as to control the flow of the cooling liquid into the air conditioner evaporator and the battery cold plate together according to the characteristics of different refrigeration modes, to adapt to the accurate refrigeration requirements of the air conditioner evaporator and the battery under different refrigeration modes.

[0029] As Figure 2 The present application is another embodiment of a vehicle refrigeration system electronic expansion valve control method, which comprises a first electronic expansion valve and a second electronic expansion valve, and a refrigeration system comprising a compressor, a condenser, an evaporator and a battery cold plate. The output end of the compressor is connected to the input end of the condenser. The output end of the condenser is connected to the input end of the evaporator through the first electronic expansion valve and to the input end of the battery cold plate through the second electronic expansion valve. The output end of the evaporator and the output end of the battery cold plate are connected to the input end of the compressor. The control method comprises the following steps: Step S201, obtaining the current refrigeration mode of the refrigeration system; Step S202, determining the target upper limit value of the first electronic expansion valve and the target lower limit value of the first electronic expansion valve based on the current refrigeration mode; determining the actual superheat degree of the evaporator outlet, and determining the target step number of the first electronic expansion valve based on the superheat degree of the evaporator; If the target step number of the first electronic expansion valve is less than the target upper limit value of the first electronic expansion valve and the target step number of the first electronic expansion valve is greater than the target lower limit value of the first electronic expansion valve, the step number of the first electronic expansion valve is controlled to be the target step number of the first electronic expansion valve; If the target step number of the first electronic expansion valve is greater than or equal to the target upper limit value of the first electronic expansion valve, the step number of the first electronic expansion valve is controlled to be the target upper limit value of the first electronic expansion valve; If the target step number of the first electronic expansion valve is less than or equal to the target lower limit value of the first electronic expansion valve, the step number of the first electronic expansion valve is controlled to be the target lower limit value of the first electronic expansion valve.

[0030] Step S203, controlling the step number of the second electronic expansion valve according to the current refrigeration mode.

[0031] Specifically, first, step S201 is performed to acquire the current refrigeration mode of the refrigeration system.

[0032] Then, step S202 is performed to determine the first electronic expansion valve target upper limit value and the first electronic expansion valve target lower limit value based on the current refrigeration mode. determining the evaporator outlet actual superheat degree, determining the first electronic expansion valve target step number based on the evaporator superheat degree; If the first electronic expansion valve target step number is less than the first electronic expansion valve target upper limit value and the first electronic expansion valve target step number is greater than the first electronic expansion valve target lower limit value, the step number of the first electronic expansion valve is controlled to be the first electronic expansion valve target step number. If the first electronic expansion valve target step number is greater than or equal to the first electronic expansion valve target upper limit value, the step number of the first electronic expansion valve is controlled to be the first electronic expansion valve target upper limit value. If the first electronic expansion valve target step number is less than or equal to the first electronic expansion valve target lower limit value, the step number of the first electronic expansion valve is controlled to be the first electronic expansion valve target lower limit value.

[0033] Specifically, according to different refrigeration modes, the corresponding first electronic expansion valve target upper limit table is calibrated in advance. The first electronic expansion valve target upper limit table represents the first electronic expansion valve target upper limit value corresponding to different compressor speeds and different ambient temperatures in the corresponding mode. For example, for the double-open mode, the first electronic expansion valve target upper limit table in the double-open mode is set. For the single-open mode, including the air conditioner single-open mode and the battery single-open mode, the first electronic expansion valve target upper limit table in the single-open mode is set. As shown in Table 1, the first electronic expansion valve target upper limit table calibrated by the bench in the double-open mode, and as shown in Table 2, the first electronic expansion valve target upper limit table calibrated by the bench in the single-open mode.

[0034] Table 1 First electronic expansion valve target upper limit table calibrated by the bench in the double-open mode

[0035] Table 2 First electronic expansion valve target upper limit table calibrated by the bench in the single-open mode

[0036] Then, according to the current refrigeration mode, a corresponding first electronic expansion valve target upper limit table is selected, and according to the current environment temperature and the current compressor speed, a corresponding value is found from the first electronic expansion valve target upper limit table corresponding to the current refrigeration mode as the first electronic expansion valve target upper limit value.

[0037] On the other hand, the first electronic expansion valve target lower limit table can also be calibrated. The first electronic expansion valve target lower limit table can be calibrated according to different tables for different refrigeration modes, or a unified first electronic expansion valve target lower limit table can be used for different refrigeration modes. As shown in Table 3, the first electronic expansion valve target lower limit table is shown. Table 3 First electronic expansion valve target lower limit table

[0038] At the same time, the first electronic expansion valve target step number is determined based on the evaporator superheat degree.

[0039] In some embodiments, the first electronic expansion valve target step number is determined based on the evaporator superheat degree, comprising: The current environment temperature is obtained, and the evaporator target superheat degree corresponding to the current environment is determined. The first electronic expansion valve target step number is determined according to the difference between the actual evaporator outlet superheat degree and the evaporator target superheat degree.

[0040] Specifically, the evaporator outlet temperature and outlet pressure are obtained from, for example, the first pressure temperature sensor 31, the evaporator superheat degree is calculated using the existing superheat degree calculation method, the corresponding evaporator target superheat degree is determined from the pre-calibrated evaporator target superheat degree table based on the current environment temperature, and the first electronic expansion valve target step number is controlled using the proportional-integral-derivative control (PID) algorithm according to the difference between the actual evaporator outlet superheat degree and the evaporator target superheat degree, with the evaporator target superheat degree as the control target, and the first electronic expansion valve target step number is determined by the PID algorithm. Wherein, as shown in Table 4, the evaporator target superheat degree table is shown.

[0041] Table 4 Evaporator target superheat degree

[0042] Then, the first electronic expansion valve target step number determined based on the actual evaporator outlet superheat degree is compared with the first electronic expansion valve target upper limit value and the first electronic expansion valve target lower limit value: If the first electronic expansion valve target step number determined based on the actual superheat degree at the evaporator outlet is within the range defined by the first electronic expansion valve target upper limit value and the first electronic expansion valve target lower limit value, the first electronic expansion valve is directly controlled using the first electronic expansion valve target step number; otherwise If the first electronic expansion valve target step number exceeds the first electronic expansion valve target upper limit value, the first electronic expansion valve is controlled using the first electronic expansion valve target upper limit value, and if the first electronic expansion valve target step number is less than the first electronic expansion valve target lower limit value, the first electronic expansion valve is controlled using the first electronic expansion valve target lower limit value.

[0043] In one of the embodiments, the first electronic expansion valve target upper limit value is determined based on the current refrigeration mode, including: Obtaining the current battery temperature; When the current battery maximum temperature is greater than or equal to a first forced temperature threshold, setting the forced target upper limit value as a closed default value, or when the current battery maximum temperature is less than or equal to a second forced temperature threshold, setting the forced target upper limit value as a target upper limit maximum value, the first forced temperature threshold being greater than the second forced temperature threshold; Obtaining the current environment temperature and the current compressor speed, and determining a first electronic expansion valve initial target upper limit value corresponding to the current environment temperature and the current compressor speed in the current refrigeration mode; Determining the first electronic expansion valve target upper limit value as the minimum of the first electronic expansion valve initial target upper limit value and the forced target upper limit value.

[0044] Specifically, when the current battery maximum temperature is greater than or equal to the first forced temperature threshold, indicating that the battery is in a high-temperature dangerous state, the forced target upper limit value is set as the closed default value at this time. When the current battery maximum temperature is less than or equal to the second forced temperature threshold, the forced target upper limit value is set as the target upper limit maximum value. Wherein, the battery maximum temperature refers to the maximum temperature or the highest temperature of the battery cell.

[0045] At the same time, the current environment temperature and the current compressor speed are obtained, and a first electronic expansion valve initial target upper limit value corresponding to the current environment temperature and the current compressor speed in the current refrigeration mode is determined. Wherein, the first electronic expansion valve initial target upper limit value can be obtained by looking up the first electronic expansion valve target upper limit table corresponding to the current refrigeration mode, for example, looking up table 1 or table 2. Then, the value found from the first electronic expansion valve target upper limit table is taken as the first electronic expansion valve initial target upper limit value, and the minimum value of the forced target upper limit value is taken as the first electronic expansion valve target upper limit value.

[0046] The closing default value is less than the first electronic expansion valve initial target upper limit value corresponding to any ambient temperature and any compressor speed in any refrigeration mode. The target upper limit maximum value is greater than the first electronic expansion valve initial target upper limit value corresponding to any ambient temperature and any compressor speed in any refrigeration mode.

[0047] Therefore, when the forced target upper limit value is the closing default value, the final first electronic expansion valve target upper limit value is the closing default value, and the first electronic expansion valve is closed. Thus, the passage of the cooling liquid into the air conditioner evaporator is cut off, the battery cooling is prioritized, and safety is ensured.

[0048] The closing default value is preferably less than 50 and greater than or equal to 0. The linear adjustment range of the electronic expansion valve is 50-500, so as long as the step number is 0-50, it is in a closed state.

[0049] More preferably, the closing default value is less than 50 and greater than 0, that is, the closing default value is preferably not set to 0, so as to distinguish from the unopened state and avoid misjudging that the first electronic expansion valve is initially opened.

[0050] When the forced target upper limit value is the target upper limit maximum value, the first electronic expansion valve initial target upper limit value is the first electronic expansion valve initial target upper limit value corresponding to the current ambient temperature and the current compressor speed in the current refrigeration mode.

[0051] The embodiment cuts off the air conditioner when the battery is in a high-temperature dangerous state, prioritizes battery cooling, and ensures safety priority.

[0052] In one of the embodiments, the step number of the first electronic expansion valve is controlled according to the current refrigeration mode, and the method further comprises: When the first electronic expansion valve is initially opened, the current ambient temperature is obtained, and the step number of the first electronic expansion valve is controlled to be the initial step number corresponding to the current ambient temperature within a preset time length.

[0053] Specifically, when the first electronic expansion valve is initially opened, the initial step number is determined according to the ambient temperature. For example, an initial step number setting table can be pre-calibrated, and then the corresponding initial step number is searched from the initial step number setting table according to the current ambient temperature. Table 5 is an initial step number setting table.

[0054] Table 5

[0055] Then the step number of the first electronic expansion valve is controlled to be the initial step number within a preset time length.

[0056] The embodiment sets a stable running for the first electronic expansion valve when it is initially opened. In this way, the time required for PID control can be reduced, so as to realize rapid refrigeration of the air conditioner and improve comfort.

[0057] Then, step S203 is executed, controlling the second electronic expansion valve according to the current cooling mode. The control method described in the later embodiments can be used for controlling the second electronic expansion valve.

[0058] Existing technologies use mechanical expansion valves at the evaporator inlet, which are prone to temperature fluctuations under low-load air conditioning conditions. This embodiment uses an electronic expansion valve at the evaporator inlet, allowing the valve to be controlled to a very small opening to meet low-load requirements without shutting off, thus preventing temperature fluctuations. Furthermore, this embodiment sets different target upper limits for different cooling modes (single / double-sided), controlling the electronic expansion valve according to the specific cooling mode. These upper and lower limit settings facilitate temperature convergence, further reducing temperature fluctuations and system energy consumption. Simultaneously, the battery temperature is monitored; if the battery is in a dangerously high-temperature state, the air conditioning is shut off to prioritize battery cooling, ensuring safety.

[0059] like Figure 5 The diagram shown is a flowchart of a preferred embodiment of the present invention for controlling an electronic expansion valve in a vehicle refrigeration system. The controlled electronic expansion valve is... Figure 4 The first electronic expansion valve 32 in the middle, the method includes: Step S501: Determine whether the number of steps of the first electronic expansion valve in the previous cycle is 0, or whether the time of the initial flag=1 is less than 5 seconds. If so, execute step S511; otherwise, execute steps S502 and S507. Step S502: If the maximum battery temperature Tbat_MAX ≥ the first forced temperature threshold Tbat1, the forced target upper limit is 10 until the maximum battery temperature Tbat_MAX falls back to the second forced temperature threshold Tbat2, at which point the forced target upper limit is restored to 500. Step S503: If it is a dual-open mode, proceed to step S504; otherwise, proceed to step S505. Step S504: Obtain the initial target upper limit value of the first electronic expansion valve from the initial target upper limit table of the first electronic expansion valve in the double-open mode, and take the smaller value of the first electronic expansion valve and the forced target upper limit value to obtain the target upper limit value of the first electronic expansion valve. Then execute step S506. Step S505: Obtain the initial target upper limit value of the first electronic expansion valve from the initial target upper limit table of the first electronic expansion valve in single-open mode, and take the smaller value of the first electronic expansion valve and the forced target upper limit value to obtain the target upper limit value of the first electronic expansion valve. Then execute step S506. Step S506: Obtain the target lower limit value of the first electronic expansion valve from the target lower limit table of the first electronic expansion valve; Step S507: Obtain the evaporator outlet temperature and outlet pressure from the first pressure and temperature sensor 31; Step S508, obtaining the evaporator target superheat from the evaporator target superheat table; Step S509, calculating the evaporator outlet superheat based on the evaporator outlet temperature and the outlet pressure; Step S510, performing PID control with the evaporator target superheat as the control target to obtain the first electronic expansion valve target step number; Step S510, limiting the first electronic expansion valve target step number based on the first electronic expansion valve target upper limit value and the first electronic expansion valve target lower limit value, if the first electronic expansion valve target step number is greater than the first electronic expansion valve target upper limit value, controlling the first electronic expansion valve step number to be the first electronic expansion valve target upper limit value, if the first electronic expansion valve target step number is less than the first electronic expansion valve target lower limit value, controlling the first electronic expansion valve step number to be the first electronic expansion valve target lower limit value, if the first electronic expansion valve target step number is less than the first electronic expansion valve target upper limit value and greater than the first electronic expansion valve target lower limit value, controlling the first electronic expansion valve step number to be the first electronic expansion valve target step number, and ending; Step S511, obtaining the initial step number from the initial step number setting table, controlling the first electronic expansion valve step number to be the initial step number, and setting the initial flag flag = 1, and ending.

[0060] As Figure 3 The working flow chart of a vehicle refrigeration system electronic expansion valve control method according to another embodiment of the present application is shown in the figure. The electronic expansion valve includes a first electronic expansion valve and a second electronic expansion valve. The refrigeration system includes a compressor, a condenser, an evaporator, and a battery cooling plate. The output end of the compressor is connected with the input end of the condenser. The output end of the condenser is connected with the input end of the evaporator through the first electronic expansion valve and connected with the input end of the battery cooling plate through the second electronic expansion valve. The output end of the evaporator and the output end of the battery cooling plate are respectively connected with the input end of the compressor. The control method includes the following steps. Step S301, obtaining the current refrigeration mode of the refrigeration system; Step S302, controlling the step number of the first electronic expansion valve according to the current refrigeration mode; Step S303, when the current refrigeration mode is an air conditioner single opening mode, obtaining the condenser outlet refrigerant pressure of the condenser outlet, and determining the second electronic expansion valve pressure relief target corresponding to the condenser outlet refrigerant pressure; If the battery maximum temperature is greater than the first battery temperature threshold value and the battery temperature difference is less than the first temperature difference threshold value, the step number of the second electronic expansion valve is controlled to be the second electronic expansion valve pressure relief target, otherwise the step number of the second electronic expansion valve is controlled to be the closed default value.

[0061] Step S304, when the current refrigeration mode is the double opening mode or the battery single opening mode, determining a second electronic expansion valve target upper limit value and a second electronic expansion valve target lower limit value; determining a battery actual overheat degree, determining a second electronic expansion valve target step number based on the battery overheat degree; If the second electronic expansion valve target step number is less than the second electronic expansion valve target upper limit value and greater than the second electronic expansion valve target lower limit value, controlling the step number of the second electronic expansion valve to be the second electronic expansion valve target step number; If the second electronic expansion valve target step number is greater than or equal to the second electronic expansion valve target upper limit value, controlling the step number of the second electronic expansion valve to be the second electronic expansion valve target upper limit value; If the second electronic expansion valve target step number is less than or equal to the second electronic expansion valve target lower limit value, controlling the step number of the second electronic expansion valve to be the second electronic expansion valve target lower limit value.

[0062] Specifically, first, step S301 is performed to obtain the current refrigeration mode of the refrigeration system. Then, step S302 is performed to control the step number of the first electronic expansion valve according to the current refrigeration mode. For the control of the first electronic expansion valve, the control mode of the foregoing embodiments can be adopted.

[0063] At the same time, if the current refrigeration mode is the air conditioner single opening mode, step S303 is performed to obtain the condenser outlet refrigerant pressure of the condenser outlet when the current refrigeration mode is the air conditioner single opening mode, and determine the second electronic expansion valve pressure relief target corresponding to the condenser outlet refrigerant pressure. If the battery maximum temperature is greater than the first battery temperature threshold and the battery temperature difference is less than the first temperature difference threshold, the step number of the second electronic expansion valve is controlled to be the second electronic expansion valve pressure relief target, otherwise the step number of the second electronic expansion valve is controlled to be a closed default value.

[0064] Specifically, in the air conditioner single opening mode, under the overload condition, the compressor has the risk of shutdown, so the pressure relief strategy is adopted on the battery side, the second electronic expansion valve connected with the battery cold plate is opened to make the cooling liquid partially enter the battery side for pressure relief, and the compressor shutdown is avoided.

[0065] The pressure relief table can be set in advance, in which different condenser outlet refrigerant pressures correspond to different second electronic expansion valve pressure relief targets. Then, the condenser outlet refrigerant pressure is obtained by, for example, the refrigerant pressure sensor 21 shown in the figure, and the corresponding second electronic expansion valve pressure relief target is obtained by looking up the table. As shown in Table 5, the pressure relief table is shown. Figure 4

[0066] Table 5 Pressure relief table​

[0067] Since the cooling liquid needs to be introduced into the battery cold plate for cooling the battery when pressure relief, the battery temperature is detected, and only when the battery temperature is greater than the first battery temperature threshold and the battery temperature difference is less than the first temperature difference threshold, the battery is cooled by pressure relief, and in other cases, pressure relief is not performed. The second electronic expansion valve pressure relief target is set to a closed default value, the second electronic expansion valve is closed, and the battery temperature is too low to cause a fault. The closed default value is preferably less than 50 and greater than or equal to 0. The linear adjustment range of the electronic expansion valve is 50-500, so as long as the step number is 0-50, it is in a closed state.

[0068] When the current cooling mode is a double-open mode or a battery single-open mode, step S304 is performed. When the current cooling mode is a double-open mode or a battery single-open mode, the second electronic expansion valve target upper limit value and the second electronic expansion valve target lower limit value are determined. The battery actual overheat degree is determined, and the second electronic expansion valve target step number is determined based on the battery overheat degree. If the second electronic expansion valve target step number is less than the second electronic expansion valve target upper limit value and the second electronic expansion valve target step number is greater than the second electronic expansion valve target lower limit value, the step number of the second electronic expansion valve is controlled to be the second electronic expansion valve target step number. If the second electronic expansion valve target step number is greater than or equal to the second electronic expansion valve target upper limit value, the step number of the second electronic expansion valve is controlled to be the second electronic expansion valve target upper limit value. If the second electronic expansion valve target step number is less than or equal to the second electronic expansion valve target lower limit value, the step number of the second electronic expansion valve is controlled to be the second electronic expansion valve target lower limit value.

[0069] Specifically, when the double-open mode or the battery single-open mode, the second electronic expansion valve is controlled based on the battery overheat degree.

[0070] Specifically, the second electronic expansion valve target upper limit value table and the second electronic expansion valve target lower limit value table can be set by calibration. Table 6 is the second electronic expansion valve target upper limit value table. Table 7 is the second electronic expansion valve target lower limit value table.

[0071] Table 6 Second electronic expansion valve target upper limit value table

[0072] Table 7 Second electronic expansion valve target lower limit value table

[0073] Then, the battery cold plate outlet temperature and the outlet pressure are obtained from, for example, the second pressure temperature sensor 41, the actual superheat degree of the battery cold plate outlet is calculated by using the existing superheat degree calculation method, and the corresponding battery target superheat degree is determined from the pre-calibrated battery target superheat degree table based on the charge and discharge state of the battery, and the second electronic expansion valve target step number is determined by PID control with the battery target superheat degree as the target.

[0074] Then, the second electronic expansion valve target step number determined based on the battery superheat degree is compared with the second electronic expansion valve target upper limit value and the second electronic expansion valve target lower limit value: If the second electronic expansion valve target step number determined based on the battery superheat degree is within the range limited by the second electronic expansion valve target upper limit value and the second electronic expansion valve target lower limit value, the second electronic expansion valve is directly controlled by the second electronic expansion valve target step number; otherwise If the second electronic expansion valve target step number exceeds the second electronic expansion valve target upper limit value, the second electronic expansion valve is controlled by the second electronic expansion valve target upper limit value, and if the second electronic expansion valve target step number is less than the second electronic expansion valve target lower limit value, the second electronic expansion valve is controlled by the second electronic expansion valve target lower limit value.

[0075] The control of the second electronic expansion valve on the battery side in this embodiment not only considers the refrigeration demand of the battery, but also considers the overall demand of the compressor in different refrigeration modes. In the air conditioning single open mode, in order to avoid the risk of compressor shutdown under overload, the second electronic expansion valve on the battery side adopts a pressure relief strategy, which avoids the shutdown of the compressor by relieving pressure on the battery side. In other modes, the second electronic expansion valve is controlled based on the battery superheat degree to meet the battery refrigeration demand.

[0076] In one of the embodiments, the determination of the second electronic expansion valve target upper limit value comprises: If the battery temperature is greater than the second battery temperature threshold or the battery temperature difference is greater than the second temperature difference threshold, the forced target upper limit value is set to the target upper limit maximum value, otherwise the forced target upper limit value is set to the closed default value; The current environment temperature and the current compressor speed are obtained, and the second electronic expansion valve initial target upper limit value corresponding to the current environment temperature and the current compressor speed is determined; If the current refrigeration mode is the double open mode, the current state is determined based on the current environment temperature, the air conditioning priority upper limit value is determined based on the current state and the current maximum battery temperature, and the maximum value of the minimum value of the second electronic expansion valve initial target upper limit value and the air conditioning priority upper limit value and the forced target upper limit value is taken as the second electronic expansion valve target upper limit value; If the current refrigeration mode is the battery single open mode, the second electronic expansion valve initial target upper limit value and the forced target upper limit value are taken as the maximum value as the second electronic expansion valve target upper limit value.

[0077] Specifically, if the battery temperature is greater than the second battery temperature threshold or the battery temperature difference is greater than the second temperature difference threshold, the forced target upper limit value is set to the target upper limit maximum value, otherwise the forced target upper limit value is set to the closed default value. Since the second electronic expansion valve target upper limit value is based on the forced target upper limit value and other upper limit values, when the battery temperature is greater than the second battery temperature threshold or the battery temperature difference is greater than the second temperature difference threshold, the second electronic expansion valve target upper limit value adopts the target upper limit maximum value. The target upper limit maximum value is preferably 500, that is, the second electronic expansion valve is fully open, avoiding the battery temperature being too high.

[0078] In other cases, the forced target upper limit value is the closed default value, and the second electronic expansion valve target upper limit value is the other upper limit value. The closed default value is preferably less than 50 and greater than or equal to 0.

[0079] At the same time, the current environment temperature and the current compressor speed are obtained, and the second electronic expansion valve initial target upper limit value corresponding to the current environment temperature and the current compressor speed is determined.

[0080] Specifically, then, for the double open mode, the air conditioning and battery refrigeration requirements need to be considered at the same time, and the air conditioning requirement is given priority in this embodiment to avoid user complaints. Therefore, based on the current state and the current maximum battery temperature, an air conditioning priority upper limit value is determined. Finally, the minimum value is taken from the second electronic expansion valve initial target upper limit value and the air conditioning priority upper limit value, and then the minimum value and the forced target upper limit value are taken as the maximum value as the second electronic expansion valve target upper limit value.

[0081] Among them, the value of the second electronic expansion valve target upper limit value table can be used as the second electronic expansion valve initial target upper limit value. For example, the value in Table 6 is used as the second electronic expansion valve initial target upper limit value.

[0082] And for the battery single open mode, the air conditioning refrigeration requirement does not need to be considered, so there is no need to set the air conditioning priority upper limit value. The second electronic expansion valve initial target upper limit value and the forced target upper limit value are taken as the maximum value as the second electronic expansion valve target upper limit value.

[0083] In the prior art, the battery direct cooling system generally only considers to preferentially meet the refrigeration request of the battery, thereby sacrificing the performance of the air conditioner.

[0084] In the embodiment, when the refrigeration mode is the double opening mode, under the high load of the air conditioner, the upper limit value of the air conditioner priority is determined based on the current state and the current maximum battery temperature, the strategy of air conditioner comfort priority is realized, and the complaints of the user are avoided. Meanwhile, when the battery temperature is too high or the temperature difference is too large, the target upper limit value of the second electronic expansion valve is set to the maximum value to meet the battery cooling demand.

[0085] In one of the embodiments, the current state is determined based on the current environment temperature, and the upper limit value of the air conditioner priority is determined based on the current state and the current maximum battery temperature, which includes: If the current environment temperature is greater than the first ring temperature threshold and less than or equal to the second ring temperature threshold, the current state is determined as the first state, and if the current environment temperature is greater than the third ring temperature threshold and less than or equal to the fourth ring temperature threshold, the current state is determined as the second state. In the first state, if the maximum battery temperature is less than the second battery temperature threshold, the battery temperature difference is less than the second temperature difference threshold, and the vehicle temperature is greater than the vehicle temperature threshold, the upper limit value of the air conditioner priority is set to the default value of closing, otherwise the upper limit value of the air conditioner priority is set to the maximum target upper limit value. In the second state, if the maximum battery temperature is less than the third battery temperature threshold, the battery temperature difference is less than the third temperature difference threshold, the continuous time length of the battery temperature control request is less than the time length threshold, and the vehicle temperature is greater than the vehicle temperature threshold, the upper limit value of the air conditioner priority is set to the default value of closing, otherwise the upper limit value of the air conditioner priority is set to the maximum target upper limit value.

[0086] Specifically, the state is divided according to the current environment temperature. The first state can be further divided into state A and state B, and the second state can be further divided into state C and state D.

[0087] In the first state, if the maximum battery temperature is less than the second battery temperature threshold, the battery temperature difference is less than the second temperature difference threshold, and the vehicle temperature is greater than the vehicle temperature threshold, the battery cooling demand is reduced because the battery temperature is low and the overall environment temperature is low at this time, and therefore the upper limit value of the air conditioner priority is set to the default value of closing, and the initial target upper limit value of the second electronic expansion valve is the smaller one of the initial target upper limit value of the second electronic expansion valve and the upper limit value of the air conditioner priority, which is the default value of closing, so that the second electronic expansion valve on the battery side is closed and the air conditioner is cooled preferentially. In other cases, the battery temperature is high, and therefore the upper limit value of the air conditioner priority is set to the maximum target upper limit value, and the initial target upper limit value of the second electronic expansion valve is the smaller one of the initial target upper limit value of the second electronic expansion valve and the upper limit value of the air conditioner priority, which is the initial target upper limit value of the second electronic expansion valve, and the battery is cooled.

[0088] In the second state, if the battery maximum temperature is less than a third battery temperature threshold, and the battery temperature difference is less than a third temperature difference threshold, and the vehicle temperature is greater than a vehicle temperature threshold, since the battery temperature is low at this time, but the overall environment temperature is high, the battery temperature control request is ignored within a preset time threshold, the air conditioner priority upper limit value is set to a closed default value, and the second electronic expansion valve initial target upper limit value is smaller than the air conditioner priority upper limit value, and the second electronic expansion valve initial target upper limit value is closed by default, so that the second electronic expansion valve on the battery side is closed, and the air conditioner refrigeration is preferred.

[0089] In other cases, including the continuous time of the battery temperature control request being greater than or equal to the time threshold, the air conditioner priority upper limit value is set to the target upper limit maximum value, and the second electronic expansion valve initial target upper limit value is smaller than the air conditioner priority upper limit value, and the second electronic expansion valve initial target upper limit value is the second electronic expansion valve initial target upper limit value, and the battery refrigeration is controlled.

[0090] Among them, the second state can be further divided into state C and state D, and the time threshold of the battery temperature control condition in state C and state D is different, so as to further control in detail.

[0091] In one embodiment, the determination of the battery actual overheat degree, the determination of the second electronic expansion valve target step number based on the battery overheat degree, comprises: If the second electronic expansion valve current step number is less than a preset step number threshold, the second electronic expansion valve target step number is increased at a preset slope, otherwise the battery actual overheat degree is determined, and the second electronic expansion valve target step number is determined based on the battery overheat degree.

[0092] Specifically, in the initial stage of the opening of the second electronic expansion valve, the second electronic expansion valve current step number is less than the preset step number threshold, and the second electronic expansion valve target step number is increased at a preset slope, so that the second electronic expansion valve is quickly positioned, and then when the second electronic expansion valve current step number is greater than or equal to the preset step number threshold, the second electronic expansion valve target step number is determined based on the battery overheat degree, for example, in the form of PID control.

[0093] The embodiment adopts the scheme of first quickly positioning and then finely adjusting the second electronic expansion valve, so as to improve the response speed of the temperature control system.

[0094] As Figure 6 The working flow chart of the vehicle refrigeration system electronic expansion valve control method of the best embodiment of the application is shown in the figure, the controlled electronic expansion valve is the second electronic expansion valve 42 in the figure Figure 4 The method comprises the following steps: Step S601, it is judged whether it is an air conditioner single opening mode, if yes, step S602 is executed, otherwise step S604 is executed; Step S602, the second electronic expansion valve pressure relief target E1 in the pressure relief table is obtained; Step S603, if the battery temperature > the first battery temperature threshold Tbat1 and the battery temperature difference is less than the first temperature difference threshold AT1, the step number of the second electronic expansion valve is controlled as E1, otherwise the step number of the second electronic expansion valve is controlled as 0; Step S604, the value from the second electronic expansion valve target upper limit value table is taken as the second electronic expansion valve initial target upper limit value E2; Step S605, the air conditioner priority upper limit value E3 is obtained from the priority logic; Step S606, if the battery temperature is greater than the second battery temperature threshold Tbat2 or the battery temperature difference is greater than the second temperature difference threshold AT2, the forced target upper limit value E2-1 is set as the target upper limit maximum value 500, otherwise E2-1 is set as 0; Step S607, E2 and E3 take the small one, and E2-1 takes the large one; Step S608, the second electronic expansion valve target lower limit value E4 is taken from the second electronic expansion valve target lower limit value table; Step S609, if the current step number of the second electronic expansion valve is greater than or equal to the preset step number threshold, step S610 is executed, otherwise step S611 is executed; Step S610, the target step number of the second electronic expansion valve is adjusted based on the battery outlet overheating degree target, and step S612 is executed; Step S611, the target step number of the second electronic expansion valve is increased at a preset slope, and step S612 is executed; Step S612, the target step number of the second electronic expansion valve is limited by the upper and lower limits of the second electronic expansion valve target upper limit value and the second electronic expansion valve target lower limit value, if the target step number of the second electronic expansion valve is greater than the target upper limit value of the second electronic expansion valve, the step number of the second electronic expansion valve is controlled as the target upper limit value of the second electronic expansion valve, if the target step number of the second electronic expansion valve is less than the target lower limit value of the second electronic expansion valve, the step number of the second electronic expansion valve is controlled as the target lower limit value of the second electronic expansion valve, if the target step number of the second electronic expansion valve is less than the target upper limit value of the second electronic expansion valve and greater than the target lower limit value of the second electronic expansion valve, the step number of the second electronic expansion valve is controlled as the target step number of the second electronic expansion valve, and the process ends.

[0095] As Figure 7 The priority logic of the best embodiment of the application is shown, when the double opening mode is entered, otherwise the air conditioner priority upper limit value E3=500, which specifically includes: Step S711, the ambient temperature Tamb is judged: Tamb1<Tamb≤Tamb2, state A is executed, step S721 is executed; Tamb2<Tamb≤Tamb3, state B is executed, step S731 is executed; Tamb3 < Tamb < Tamb4, state C, step S741 is performed; Tamb4 < Tamb, state D, step S751 is performed; Step S721, if the battery maximum temperature Tbat_MAX < second battery temperature threshold Tbat2 and the battery temperature difference < second temperature difference threshold AT2, step S722 is performed, otherwise the air conditioning priority upper limit value E3 = 500, end; Step S722, if the vehicle temperature > vehicle temperature threshold Tv, the air conditioning priority upper limit value E3 = 0, otherwise the air conditioning priority upper limit value E3 = 500, end; Step S731, if Tbat_MAX < Tbat2 and the battery temperature difference < AT2, step S732 is performed, otherwise the air conditioning priority upper limit value E3 = 500, end; Step S732, if the vehicle temperature > Tv, the air conditioning priority upper limit value E3 = 0, otherwise the air conditioning priority upper limit value E3 = 500, end; Step S741, if Tbat_MAX < third battery temperature threshold Tbat3 and the battery temperature difference < third temperature difference threshold AT3, step S742 is performed, otherwise the air conditioning priority upper limit value E3 = 500, end; Step S742, if the temperature control request continuous time < first time threshold Time1, step S743 is performed, otherwise the air conditioning priority upper limit value E3 = 500, end; Step S743, if the vehicle temperature > vehicle temperature threshold Tv, the air conditioning priority upper limit value E3 = 0, otherwise the air conditioning priority upper limit value E3 = 500, end; Step S751, if Tbat_MAX < Tbat3 and the battery temperature difference < AT3, step S752 is performed, otherwise the air conditioning priority upper limit value E3 = 500, end; Step S752, if the temperature control request continuous time < second time threshold Time2, step S753 is performed, otherwise the air conditioning priority upper limit value E3 = 500, end; Step S753, if the vehicle temperature > vehicle temperature threshold Tv, the air conditioning priority upper limit value E3 = 0, otherwise the air conditioning priority upper limit value E3 = 500, end.

[0096] Wherein, different states can adopt different control parameters, for example, different battery temperature thresholds, temperature difference thresholds, vehicle temperature thresholds, etc.

[0097] It should be understood that the size of the serial number of each step in the above embodiment does not mean the order of execution, the execution order of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiment of the application.

[0098] AsFigure 8 The diagram shown is a hardware structure schematic of an electronic device according to the present invention, comprising: At least one processor 801; and, A memory 802 is communicatively connected to at least one of the processors 801; wherein, The memory 802 stores instructions that can be executed by at least one of the processors to enable the at least one of the processors to perform the vehicle refrigeration system electronic expansion valve control method as described above.

[0099] Figure 8 Take the 801 processor as an example.

[0100] The electronic device may also include an input device 803 and a display device 804.

[0101] The processor 801, memory 802, input device 803 and display device 804 can be connected by a bus or other means. The figure shows an example of connection by bus.

[0102] The memory 802, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as the program instructions / modules corresponding to the vehicle refrigeration system electronic expansion valve control method in the embodiments of this application, for example, Figure 1 , Figure 2 The method flow is shown. The processor 801 executes various functional applications and data processing by running non-volatile software programs, instructions, and modules stored in the memory 802, thereby realizing the vehicle refrigeration system electronic expansion valve control method in the above embodiment.

[0103] The memory 802 may include a program storage area and a data storage area. The program storage area may store an operating system and an application program required for at least one function. The data storage area may store data created based on the use of the vehicle refrigeration system electronic expansion valve control method, etc. Furthermore, the memory 802 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 802 may optionally include memory remotely located relative to the processor 801, and these remote memories can be connected via a network to the apparatus performing the vehicle refrigeration system electronic expansion valve control method. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0104] The input device 803 can receive input user clicks and generate signal inputs related to user settings and function controls of the electronic expansion valve control method of the vehicle refrigeration system. The display device 804 can include a display screen or the like display device.

[0105] When the one or more modules are stored in the memory 802, when executed by the one or more processors 801, the vehicle refrigeration system electronic expansion valve control method in any of the above method embodiments is performed.

[0106] The present application controls the number of steps of the first electronic expansion valve and the second electronic expansion valve for different refrigeration modes of the refrigeration system, so as to control the flow of cooling liquid into the air conditioner evaporator and the battery cold plate according to the characteristics of different refrigeration modes, so as to adapt to the accurate refrigeration requirements of the air conditioner evaporator and the battery under different refrigeration modes.

[0107] An embodiment of the present application provides a storage medium, which stores computer instructions, when the computer executes the computer instructions, all steps of the vehicle refrigeration system electronic expansion valve control method as described above are executed.

[0108] In the context of the present disclosure, the storage medium can be a tangible medium, which can contain or store programs for use by or in connection with an instruction execution system, device or apparatus. The storage medium can be a machine-readable signal medium or a machine-readable storage medium. Alternatively, the storage medium can be a non-transitory computer-readable storage medium, for example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a compact disc read-only memory (CD-ROM), a magnetic tape, a floppy disk and an optical data storage device, etc.

[0109] An embodiment of the present application provides a computer program product, which includes computer programs / instructions, when executed by a processor, the vehicle refrigeration system electronic expansion valve control method as described above is realized.

[0110] The above-described embodiments only express several embodiments of the present application, which are described in a more specific and detailed manner, but cannot be understood as a limitation on the scope of the present application. It should be noted that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A vehicle refrigeration system electronic expansion valve control method, the electronic expansion valve comprising a first electronic expansion valve and a second electronic expansion valve, the refrigeration system comprising a compressor, a condenser, an evaporator and a battery cold plate, the output end of the compressor being connected with the input end of the condenser, the output end of the condenser being connected with the input end of the evaporator through the first electronic expansion valve and the input end of the battery cold plate through the second electronic expansion valve respectively, the output end of the evaporator and the output end of the battery cold plate being connected with the input end of the compressor respectively, characterized in that, The control method comprises: acquiring a current refrigeration mode of a refrigeration system; controlling a step number of the first electronic expansion valve according to the current refrigeration mode; controlling a step number of the second electronic expansion valve according to the current refrigeration mode.

2. The method of claim 1, wherein, The step number of the first electronic expansion valve is controlled according to the current refrigeration mode, comprising: determining a first electronic expansion valve target upper limit value and a first electronic expansion valve target lower limit value based on the current refrigeration mode; determining an evaporator outlet actual superheat degree, and determining a first electronic expansion valve target step number based on the evaporator superheat degree; if the first electronic expansion valve target step number is less than the first electronic expansion valve target upper limit value and greater than the first electronic expansion valve target lower limit value, controlling the step number of the first electronic expansion valve to be the first electronic expansion valve target step number; if the first electronic expansion valve target step number is greater than or equal to the first electronic expansion valve target upper limit value, controlling the step number of the first electronic expansion valve to be the first electronic expansion valve target upper limit value; if the first electronic expansion valve target step number is less than or equal to the first electronic expansion valve target lower limit value, controlling the step number of the first electronic expansion valve to be the first electronic expansion valve target lower limit value.

3. The method of claim 2, wherein, The first electronic expansion valve target upper limit value is determined based on the current refrigeration mode, comprising: acquiring a current battery temperature; when the current battery maximum temperature is greater than or equal to a first forced temperature threshold, setting a forced target upper limit value to a closed default value, or when the current battery maximum temperature is less than or equal to a second forced temperature threshold, setting the forced target upper limit value to a target upper limit maximum value, the first forced temperature threshold being greater than the second forced temperature threshold; acquiring a current environment temperature and a current compressor speed, and determining a first electronic expansion valve initial target upper limit value corresponding to the current environment temperature and the current compressor speed in the current refrigeration mode; determining the first electronic expansion valve target upper limit value to be the minimum value of the first electronic expansion valve initial target upper limit value and the forced target upper limit value.

4. The method of claim 2, wherein, The step number of the first electronic expansion valve is controlled according to the current refrigeration mode, further comprising: when the first electronic expansion valve is initially turned on, acquiring a current environment temperature, and controlling the step number of the first electronic expansion valve to be an initial step number corresponding to the current environment temperature within a preset time length.

5. The method of claim 1, wherein, The step number of the second electronic expansion valve is controlled according to the current refrigeration mode, comprising: when the current refrigeration mode is an air conditioner single opening mode, acquiring a condenser outlet refrigerant pressure of a condenser outlet, and determining a second electronic expansion valve pressure relief target corresponding to the condenser outlet refrigerant pressure; if the battery maximum temperature is greater than a first battery temperature threshold and the battery temperature difference is less than a first temperature difference threshold, controlling the step number of the second electronic expansion valve to be the second electronic expansion valve pressure relief target, otherwise controlling the step number of the second electronic expansion valve to be a closed default value.

6. The method of claim 1, wherein, The step number of the second electronic expansion valve is controlled according to the current refrigeration mode, comprising: determining a second electronic expansion valve target upper limit value and a second electronic expansion valve target lower limit value when the current refrigeration mode is the double-open mode or the battery single-open mode; determining a battery actual overheat degree, and determining a second electronic expansion valve target step number based on the battery overheat degree; if the second electronic expansion valve target step number is less than the second electronic expansion valve target upper limit value and greater than the second electronic expansion valve target lower limit value, controlling the step number of the second electronic expansion valve to be the second electronic expansion valve target step number; if the second electronic expansion valve target step number is greater than or equal to the second electronic expansion valve target upper limit value, controlling the step number of the second electronic expansion valve to be the second electronic expansion valve target upper limit value; if the second electronic expansion valve target step number is less than or equal to the second electronic expansion valve target lower limit value, controlling the step number of the second electronic expansion valve to be the second electronic expansion valve target lower limit value.

7. The method of claim 6, wherein, The determination of the second electronic expansion valve target upper limit value comprises: if the battery temperature is greater than a second battery temperature threshold or the battery temperature difference is greater than a second temperature difference threshold, setting a forced target upper limit value to be a target upper limit maximum value, otherwise setting the forced target upper limit value to be a closed default value; obtaining a current environment temperature and a current compressor rotating speed, and determining a second electronic expansion valve initial target upper limit value corresponding to the current environment temperature and the current compressor rotating speed; if the current refrigeration mode is the double-open mode, determining a current state based on the current environment temperature, determining an air conditioner priority upper limit value based on the current state and a current battery maximum temperature, and taking the maximum value of the second electronic expansion valve initial target upper limit value and the air conditioner priority upper limit value and the forced target upper limit value as the second electronic expansion valve target upper limit value; if the current refrigeration mode is the battery single-open mode, taking the maximum value of the second electronic expansion valve initial target upper limit value and the forced target upper limit value as the second electronic expansion valve target upper limit value.

8. The method of claim 7, wherein, The determination of the current state based on the current environment temperature and the determination of the air conditioner priority upper limit value based on the current state and the current battery maximum temperature comprise: if the current environment temperature is greater than a first ambient temperature threshold and less than or equal to a second ambient temperature threshold, determining the current state to be a first state, and if the current environment temperature is greater than a third ambient temperature threshold and less than or equal to a fourth ambient temperature threshold, determining the current state to be a second state; in the first state, if the battery maximum temperature is less than a second battery temperature threshold, the battery temperature difference is less than a second temperature difference threshold, and the vehicle interior temperature is greater than a vehicle temperature threshold, setting the air conditioner priority upper limit value to be a closed default value, otherwise setting the air conditioner priority upper limit value to be a target upper limit maximum value; in the second state, if the battery maximum temperature is less than a third battery temperature threshold, the battery temperature difference is less than a third temperature difference threshold, the continuous time length of the battery temperature control request is less than a time length threshold, and the vehicle interior temperature is greater than a vehicle temperature threshold, setting the air conditioner priority upper limit value to be a closed default value, otherwise setting the air conditioner priority upper limit value to be a target upper limit maximum value.

9. The method of claim 6, wherein, The determination of the battery actual overheat degree and the determination of the second electronic expansion valve target step number based on the battery overheat degree comprise: If the current step number of the second electronic expansion valve is less than the preset step number threshold, the target step number of the second electronic expansion valve is increased at a preset slope, otherwise, the actual overheat degree of the battery is determined, and the target step number of the second electronic expansion valve is determined based on the overheat degree of the battery.

10. An electronic device, comprising: Comprise: At least one processor; And, The memory is in communication with the at least one processor; wherein The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the vehicle refrigeration system electronic expansion valve control method according to any one of claims 1 to 9.

11. A storage medium, characterized by The storage medium stores computer instructions, and when the computer executes the computer instructions, all steps of the vehicle refrigeration system electronic expansion valve control method according to any one of claims 1 to 9 are executed.

12. A computer program product comprising computer programs / instructions, characterized in that, The computer program / instructions are executed by the processor to implement the vehicle refrigeration system electronic expansion valve control method according to any one of claims 1 to 9.

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