Vehicle electronic expansion valve control method, device, equipment, storage medium and vehicle

Abstract

The application discloses a kind of control method, device, equipment, storage medium and vehicle of vehicle electronic expansion valve, comprising: obtaining the battery temperature and compressor first side pressure value of whole vehicle;According to the battery temperature, first side pressure value and electronic expansion valve's opening degree characteristic table determines the basic opening degree of electronic expansion valve;According to the relationship between first side pressure value and first threshold value determines the actual growth rate of first side pressure value;According to the actual growth rate of first side pressure value determines the first correction opening degree of electronic expansion valve;According to basic opening degree and first correction opening degree determines the final opening degree of electronic expansion valve.The control method of vehicle electronic expansion valve provided in the application is based on ambient temperature, battery temperature and compressor high pressure side pressure value to correct the opening degree of electronic expansion valve, when battery has the trend of temperature rise, the opening degree of electronic expansion valve is controlled in advance, and optimal cooling effect is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thermal management of new energy vehicles, and particularly relates to a control method, device and equipment of an electronic expansion valve for a vehicle, a storage medium and a vehicle. BACKGROUND

[0002] In order to meet the cooling requirements of the battery, a thermal management unit needs to be used to dissipate heat from the battery. At present, the expansion valve in the thermal management unit for a vehicle is a mechanical expansion valve. The mechanical expansion valve is opened by a temperature sensing bag. The adjustment is not sensitive, and cannot adapt to the refrigerating capacity adjustment in a wide temperature range. In a low temperature environment, for example, at -35 degrees Celsius, when the thermal management unit has a heat dissipation requirement, the mechanical expansion valve cannot be opened in time, so that the high pressure end cannot be gasified in time, and the low pressure end is in a vacuum state for a long time, and the cooling requirement of the thermal management unit cannot be normally met. When the battery temperature fluctuates greatly, the mechanical expansion valve can adjust the valve opening degree through the temperature sensing bag, and has a lag in control, and cannot achieve the best cooling effect. SUMMARY

[0003] The present application provides a control method, device and equipment of an electronic expansion valve for a vehicle, a storage medium and a vehicle. The electronic expansion valve is used to replace the mechanical expansion valve in the prior art. The opening degree of the electronic expansion valve is corrected based on the battery temperature, the ambient temperature and the high pressure side pressure value of the compressor, so that the final opening degree of the electronic expansion valve is determined by the basic opening degree and the corrected opening degree. When the battery has a temperature rising trend, the opening degree of the electronic expansion valve is controlled in advance, and the opening degree of the electronic expansion valve does not have to be adjusted when the battery temperature fluctuates greatly, so that the best cooling effect is achieved.

[0004] According to a first aspect of the present application, a control method of an electronic expansion valve for a vehicle is provided, comprising:

[0005] obtaining a battery temperature of a whole vehicle and a first side pressure value of a compressor;

[0006] determining a basic opening degree of an electronic expansion valve according to the battery temperature, the first side pressure value and an opening degree characteristic table of the electronic expansion valve;

[0007] determining an actual growth rate of the first side pressure value according to the relationship between the first side pressure value and a first threshold value;

[0008] determining a first corrected opening degree of the electronic expansion valve according to the actual growth rate of the first side pressure value;

[0009] determining a final opening degree of the electronic expansion valve according to the basic opening degree and the first corrected opening degree; wherein the first threshold value is a lower limit value of a second side pressure value of the compressor; and the first side pressure value of the compressor is greater than the second side pressure value of the compressor.

[0010] Optionally, before determining the final opening degree of the electronic expansion valve according to the basic opening degree and the first correction opening degree, further comprising:

[0011] determining an actual decreasing rate of the second side pressure value according to a relationship between the second side pressure value and a second threshold value;

[0012] determining a second correction opening degree of the electronic expansion valve according to the actual decreasing rate of the second side pressure value;

[0013] determining the final opening degree of the electronic expansion valve according to the basic opening degree, the first correction opening degree and the second correction opening degree; wherein the second threshold value is an increasing limit value of the first side pressure value of the compressor.

[0014] Optionally, before determining the final opening degree of the electronic expansion valve according to the basic opening degree, the first correction opening degree and the second correction opening degree, further comprising:

[0015] obtaining an ambient temperature of the whole vehicle, a charging current value of the battery and a discharging current value of the battery;

[0016] determining a charging heat of the battery according to the ambient temperature and the charging current value;

[0017] determining a discharging heat of the battery according to the ambient temperature and the discharging current value;

[0018] determining a total heat of the battery according to the charging heat and the discharging heat.

[0019] Optionally, the total heat is calculated and generated based on formula (one):

[0020] Q=Q1+Q2(one)

[0021] wherein Q is the total heat of the battery, Q1 is the charging heat of the battery, and Q2 is the discharging heat of the battery.

[0022] before determining an actual increasing rate of the first side pressure value according to a relationship between the first side pressure value and a first threshold value, comprising:

[0023] determining a correction value of the electronic expansion valve according to a relationship between the total heat of the battery and a third threshold value; wherein the third threshold value is a heat increasing limit value of the battery.

[0024] Optionally, determining the correction value of the electronic expansion valve according to the relationship between the total heat of the battery and the third threshold value, comprising:

[0025] determining a third correction degree of the electronic expansion valve according to the total heat of the battery when the total heat of the battery is greater than or equal to the third threshold value;

[0026] determining the correction value of the electronic expansion valve as 0 when the total heat of the battery is less than the third threshold value.

[0027] Optionally, determining the final degree of the electronic expansion valve according to the basic degree, the first correction degree and the second correction degree, comprises:

[0028] determining the final degree of the electronic expansion valve according to the basic degree, the first correction degree, the second correction degree and the third correction degree of the electronic expansion valve.

[0029] Optionally, the final degree of the electronic expansion valve is calculated according to formula (two):

[0030] Duty=Duty0+DelDuty1+DelDuty2+DelDuty3(two)

[0031] wherein, Duty is the final degree of the electronic expansion valve, Duty0 is the basic degree of the electronic expansion valve, DelDuty1 is the first correction degree, DelDuty2 is the second correction degree, and DelDuty3 is the third correction degree.

[0032] Optionally, the first side pressure value is obtained by a first pressure sensor installed between the outlet of the compressor and the condenser, and the second side pressure value is obtained by a second pressure sensor installed between the evaporator and the compressor.

[0033] Optionally, the battery temperature is obtained by a temperature sensor installed on the surface of the battery.

[0034] According to a second aspect of the present application, a control device of an electronic expansion valve for vehicle is provided, which is used to execute the control method of the electronic expansion valve for vehicle according to any one of the first aspect of the present application, and the control device comprises:

[0035] an acquisition module, configured to acquire the battery temperature of the vehicle and the first side pressure value of the compressor;

[0036] a calculation module, configured to determine the basic degree of the electronic expansion valve according to the battery temperature, the first side pressure value and the degree characteristic table of the electronic expansion valve; determine the actual increasing rate of the first side pressure value according to the relationship between the first side pressure value and the first threshold value; determine the first correction degree of the electronic expansion valve according to the actual increasing rate of the first side pressure value; and determine the final degree of the electronic expansion valve according to the basic degree and the first correction degree.

[0037] Optionally, the obtaining module is further configured to obtain an ambient temperature of the vehicle, a charging current value of the battery, and a discharging current value of the battery.

[0038] The calculating module is further configured to determine a charging heat of the battery according to the ambient temperature and the charging current value, determine a discharging heat of the battery according to the ambient temperature and the discharging current value, and determine a total heat of the battery according to the charging heat and the discharging heat.

[0039] According to a third aspect of the present application, there is provided a control device of an electronic expansion valve for vehicle, comprising:

[0040] one or more processors;

[0041] a memory device configured to store one or more programs,

[0042] when the one or more programs are executed by the one or more processors, the one or more processors implement the control method of the electronic expansion valve for vehicle as described in any one of the first aspect of the present application.

[0043] According to a fourth aspect of the present application, there is provided a computer readable storage medium having stored thereon a computer program, which, when executed by a processor, implement the control method of the electronic expansion valve for vehicle as described in any one of the first aspect of the present application.

[0044] According to a fifth aspect of the present application, there is provided a vehicle comprising the control device of the electronic expansion valve for vehicle as described in the second aspect of the present application.

[0045] The application provides a control method, device, equipment, storage medium and vehicle for an electronic expansion valve for a vehicle, comprising: obtaining a battery temperature of the vehicle and a first side pressure value of a compressor; determining a basic opening degree of the electronic expansion valve according to the battery temperature, the first side pressure value and an opening degree characteristic table of the electronic expansion valve; determining an actual growth rate of the first side pressure value according to a relationship between the first side pressure value and a first threshold value; determining a first corrected opening degree of the electronic expansion valve according to the actual growth rate of the first side pressure value; and determining a final opening degree of the electronic expansion valve according to the basic opening degree and the first corrected opening degree, wherein the first threshold value is a lower limit value of a second side pressure value of the compressor, and the first side pressure value of the compressor is greater than the second side pressure value of the compressor. The control method for the electronic expansion valve for the vehicle provided by the application uses the electronic expansion valve to replace the mechanical expansion valve in the prior art, corrects the opening degree of the electronic expansion valve based on the battery temperature, the ambient temperature and the high-pressure side pressure value of the compressor, thereby determining the final opening degree of the electronic expansion valve through the basic opening degree and the corrected opening degree, and the opening degree of the electronic expansion valve is controlled in advance when the battery has a temperature rising trend, instead of adjusting the opening degree of the electronic expansion valve when the battery temperature fluctuates greatly, so that the optimal cooling effect is achieved.

[0046] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the application, nor is it used to limit the scope of the application. Other features of the application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative effort based on these drawings.

[0048] Figure 1 is a control method flow chart of an electronic expansion valve for a vehicle provided by an embodiment of the application;

[0049] Figure 2 is another control method flow chart of an electronic expansion valve for a vehicle provided by an embodiment of the application;

[0050] Figure 3 is another control method flow chart of an electronic expansion valve for a vehicle provided by an embodiment of the application;

[0051] Figure 4 is another control method flow chart of an electronic expansion valve for a vehicle provided by an embodiment of the application;

[0052] Figure 5is another control method flow chart of the vehicle electronic expansion valve provided by the embodiment of the present application;

[0053] Figure 6 is another control method flow chart of the vehicle electronic expansion valve provided by the embodiment of the present application;

[0054] Figure 7 is a control device block diagram of the vehicle electronic expansion valve provided by the embodiment of the present application;

[0055] Figure 8 is a control device block diagram of the vehicle electronic expansion valve provided by the embodiment of the present application. DETAILED DESCRIPTION

[0056] In order to make the personnel in the technical field better understand the present application scheme, the technical scheme in the embodiment of the present application will be described clearly and completely below by combining the drawings in the embodiment of the present application. Obviously, the described embodiment is only a part of the embodiment of the present application, not all. Based on the embodiment in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present application.

[0057] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0058] It should be understood that the steps can be reordered, added or deleted using the various forms of flow shown above. For example, the steps described in the present application can be executed in parallel, in sequence or in different order, as long as the desired results of the technical scheme of the present application can be achieved, which is not limited herein.

[0059] Figure 1 is a control method flow chart of the vehicle electronic expansion valve provided by the embodiment of the present application, referring to Figure 1 The control method of the vehicle electronic expansion valve provided by the embodiment of the present application comprises:

[0060] S101, obtaining the battery temperature of the whole vehicle and the first side pressure value of the compressor.

[0061] Specifically, the battery temperature of the whole vehicle can be obtained by the temperature sensor installed in the battery in the vehicle to obtain the temperature value of the battery in the whole vehicle; the compressor is responsible for compressing and transporting refrigerant, thereby ensuring the normal operation of the air conditioning system in the whole vehicle, and the first side pressure value of the compressor can be obtained by the pressure sensor installed on the high-pressure side of the compressor. At the same time, the battery temperature and the first side pressure value of the compressor are obtained, and since the high-pressure side pressure value in the compressor is more sensitive than the low-pressure side pressure value, the first side pressure value of the compressor obtained here is preferably the high-pressure side pressure value.

[0062] S102, determining the basic opening degree of the electronic expansion valve according to the battery temperature, the first side pressure value and the opening degree characteristic table of the electronic expansion valve.

[0063] The electronic expansion valve is a precise flow control device in the refrigeration or air conditioning system of the whole vehicle, and the flow of refrigerant is accurately adjusted by controlling the opening degree of the electronic expansion valve; the opening degree characteristic table of the electronic expansion valve is a table of environmental test temperature, battery test temperature, first side test pressure value of the compressor and basic opening degree of the electronic expansion valve, which is prepared in advance by actual experimental test data, which reflects the different basic opening degrees of the electronic expansion valve corresponding to different battery test temperatures and different first side test pressure values of the compressor. For example, when the environmental temperature is-10℃, the battery test temperature is 5℃, and the first side test pressure value of the compressor is 150psi, the basic opening degree of the electronic expansion valve is adjusted to 30%; when the environmental temperature is 0℃, the battery test temperature is 15℃, and the first side test pressure value of the compressor is 180psi, the basic opening degree of the electronic expansion valve is adjusted to 30%; when the environmental temperature is 25℃, the battery test temperature is 30℃, and the first side test pressure value of the compressor is 200psi, the basic opening degree of the electronic expansion valve is adjusted to 50%; when the environmental temperature is 40℃, the battery test temperature is 45℃, and the first side test pressure value of the compressor is 220psi, the basic opening degree of the electronic expansion valve is adjusted to 60%. The corresponding relationship between each environmental temperature, battery test temperature, first side test pressure value of the compressor and basic opening degree of the electronic expansion valve is measured to form the opening degree characteristic table of the electronic expansion valve.

[0064] Specifically, the basic opening degree of the electronic expansion valve is determined according to the battery temperature (i.e. the actual battery temperature of the whole vehicle at this moment), the first side pressure value (i.e. the actual first side pressure value of the compressor of the whole vehicle at this moment) and the opening degree characteristic table of the electronic expansion valve (i.e. the opening degree characteristic table of the electronic expansion valve prepared in advance by the test data as described above), so as to accurately adjust the air conditioning system of the whole vehicle.

[0065] S103, determining the actual growth rate of the first side pressure value according to the relationship between the first side pressure value and the first threshold value.

[0066] Specifically, the first side pressure value is the compressor first side pressure value actually obtained by the pressure sensor in the above step S102, and the first threshold value can be a lower limit value of the second side pressure value of the compressor, wherein the first side pressure value of the compressor is greater than the second side pressure value of the compressor, that is, the first side pressure value of the compressor is the high pressure side pressure value of the compressor, and the second side pressure value of the compressor is the low pressure side pressure value of the compressor.

[0067] When the first side pressure value of the compressor is greater than or equal to the first threshold value, the actual growth rate of the first side pressure value is calculated according to the first side pressure value of the compressor;

[0068] When the first side pressure value of the compressor is less than the first threshold value, the basic opening degree of the electronic expansion valve at this time is the final opening degree of the electronic expansion valve (that is, the output opening degree of the electronic expansion valve). The reason why the first threshold value is the lower limit value of the second side pressure value of the compressor is that in the prior art, the high pressure side is compared with the upper limit value of the high pressure side, and the low pressure side is compared with the lower limit value of the low pressure side. The electronic expansion valve control method provided in the embodiment of the application creatively compares the first side pressure value (that is, the high pressure side pressure value) of the compressor with the lower limit value of the second side pressure value (that is, the low pressure side pressure value of the compressor). For example, when the pressure value of the high pressure side of the compressor rises to close to the upper limit value of the pressure, it is too late to adjust the opening degree of the electronic expansion valve, and the high pressure side pressure value will still exceed the upper limit value of the high pressure side pressure value (that is, the prior art solution). Therefore, the high pressure side pressure value is compared with the lower limit value (that is, the first threshold value) of the rapid decrease of the low pressure side, and when the growth rate is too fast, the opening degree value of the electronic expansion valve is corrected, so that the high pressure side pressure value of the compressor will not exceed the upper limit value of the high pressure side.

[0069] S104, determining the first correction opening degree of the electronic expansion valve according to the actual growth rate of the first side pressure value.

[0070] Specifically, the first correction opening degree of the electronic expansion valve is determined according to the actual growth rate of the first side pressure value of the compressor determined in the above step S103. For example, the first side pressure value of the compressor is 150 psi, the basic opening degree of the electronic expansion valve is 50%, and when the calculated actual growth rate of the first side pressure value is 10 psi / min, the first correction opening degree of the electronic expansion valve is adjusted to 10%.

[0071] S105, determining the final opening degree of the electronic expansion valve according to the basic opening degree and the first correction opening degree.

[0072] Specifically, the final opening degree of the electronic expansion valve is determined according to the basic opening degree and the first correction opening degree determined in steps S102 and S104 respectively, for example, the first correction opening degree determined in step S104 is 10%, the basic opening degree of the electronic expansion valve is 50%, and the final opening degree of the electronic expansion valve is determined as: 10% (i.e. the first correction opening degree) + 50% (the basic opening degree) = 60%, that is, the opening degree of the electronic expansion valve is adjusted from the basic opening degree 50% to 60% to meet the cooling effect of the vehicle air conditioning system.

[0073] The control method of the electronic expansion valve for vehicles provided by the embodiment of the application uses an electronic expansion valve to replace the mechanical expansion valve in the prior art, corrects the opening degree of the electronic expansion valve based on the battery temperature, the ambient temperature and the high-pressure side pressure value of the compressor, and determines the final opening degree of the electronic expansion valve through the basic opening degree and the corrected opening degree, so that the opening degree of the electronic expansion valve is controlled in advance when the battery has a temperature rising trend, without having to wait until the battery temperature fluctuates greatly to adjust the opening degree of the electronic expansion valve, thereby achieving the best cooling effect.

[0074] On the basis of the above-mentioned embodiment of the application, the embodiment of the application further refines the determination of the final opening degree of the electronic expansion valve according to the basic opening degree and the first correction opening degree, Figure 2 is another flowchart of the control method of the electronic expansion valve for vehicles provided by the embodiment of the application, with reference to Figure 2 The control method of the electronic expansion valve provided by the embodiment of the application further comprises:

[0075] S201, obtaining the battery temperature of the vehicle and the first side pressure value of the compressor.

[0076] S202, determining the basic opening degree of the electronic expansion valve according to the battery temperature, the first side pressure value and the opening degree characteristic table of the electronic expansion valve.

[0077] S203, determining the actual growth rate of the first side pressure value according to the relationship between the first side pressure value and the first threshold value.

[0078] S204, determining the first correction opening degree of the electronic expansion valve according to the actual growth rate of the first side pressure value.

[0079] S205, determining the actual growth rate of the second side pressure value according to the relationship between the second side pressure value and the second threshold value.

[0080] Specifically, the second side pressure value can be the second side pressure value of the compressor obtained by the pressure sensor, and the second threshold value can be the upper limit value of the first side pressure value of the compressor.

[0081] The second threshold value is an upper limit value of the first side pressure value of the compressor. In the prior art, the low pressure side is compared with the lower limit value of the low pressure side. The electronic expansion valve control method provided in the embodiment compares the second side pressure value (i.e. the low pressure side pressure value) of the compressor with the lower limit value of the first side pressure value (i.e. the high pressure side pressure value of the compressor). For example, when the pressure value of the low pressure side of the compressor decreases to approach the lower limit value of the pressure, the opening degree of the electronic expansion valve has already been adjusted, and the low pressure side pressure value is still lower than the lower limit value of the low pressure side pressure value (i.e. the prior art solution). Therefore, the low pressure side pressure value is compared with the upper limit value of the rapid increase of the high pressure side (i.e. the second threshold value). When the decrease rate is too fast, the opening degree value of the electronic expansion valve is corrected, so that the low pressure side pressure value of the compressor will not be lower than the lower limit value of the low pressure side.

[0082] S206, determining the second correction opening degree of the electronic expansion valve according to the actual decrease rate of the second side pressure value.

[0083] Specifically, the second correction opening degree of the electronic expansion valve is determined according to the actual decrease rate of the second side pressure value determined in step S103. For example, the second side pressure value of the compressor is 150 psi, the basic opening degree of the electronic expansion valve is 50%, and the actual decrease rate of the second side pressure value is 5 psi / min. The second correction opening degree of the electronic expansion valve is -5%.

[0084] S207, determining the final opening degree of the electronic expansion valve according to the basic opening degree, the first correction opening degree and the second correction opening degree.

[0085] Specifically, the final opening degree of the electronic expansion valve is determined according to the basic opening degree, the first correction opening degree and the second correction opening degree determined in steps S202, S204 and S206. For example, the final opening degree of the electronic expansion valve is 45% (basic opening degree 50%+first correction opening degree 10%+second correction opening degree -5%).

[0086] On the basis of the above-mentioned embodiment, the embodiment further refines the determination of the final opening degree of the electronic expansion valve according to the basic opening degree, the first correction opening degree and the second correction opening degree. Figure 3 Another control method flow chart of the vehicle electronic expansion valve is provided in the embodiment, which is described with reference to Figure 3 The control method of the vehicle electronic expansion valve provided in the embodiment further comprises:

[0087] S301, obtaining the battery temperature of the vehicle and the first side pressure value of the compressor.

[0088] S302, determining the basic opening degree of the electronic expansion valve according to the battery temperature, the first side pressure value and the opening degree characteristic table of the electronic expansion valve.

[0089] S303, determining an actual increasing rate of the first side pressure value according to a relationship between the first side pressure value and a first threshold value.

[0090] S304, determining a first corrected opening degree of the electronic expansion valve according to the actual increasing rate of the first side pressure value.

[0091] S305, determining an actual decreasing rate of the second side pressure value according to a relationship between the second side pressure value and a second threshold value.

[0092] S306, determining a second corrected opening degree of the electronic expansion valve according to the actual decreasing rate of the second side pressure value.

[0093] S307, obtaining an ambient temperature of the whole vehicle, a charging current value of the battery and a discharging current value of the battery.

[0094] Specifically, the ambient temperature of the whole vehicle is obtained, which can be obtained by a temperature sensor installed on the surface of the vehicle body; the charging current value of the battery of the whole vehicle and the discharging current value of the battery of the whole vehicle can be obtained by a Hall current sensor installed on the battery.

[0095] S308, determining a charging heat of the battery according to the ambient temperature and the charging current value; determining a discharging heat of the battery according to the ambient temperature and the discharging current value.

[0096] Specifically, the charging heat can be determined based on the relationship between the ambient temperature and the charging current value, and the discharging heat can be determined based on the relationship between the ambient temperature and the discharging current value. For example, the charging heat and the discharging heat of the battery can be calculated by the formula S=I 2 ×R×T, wherein S is the charging / discharging heat, I is the battery internal resistance during charging / discharging, and T is the ambient temperature.

[0097] S309, determining a total heat of the battery according to the charging heat and the discharging heat.

[0098] Specifically, the total heat of the battery is calculated according to the charging heat and the discharging heat determined in the above step S308.

[0099] Optionally, the total heat of the battery of the whole vehicle can be calculated by formula (I):

[0100] Q=Q1+Q2(I)

[0101] Wherein Q is the total heat of the battery, Q1 is the charging heat of the battery, and Q2 is the discharging heat of the battery.

[0102] S310, determining a final opening degree of the electronic expansion valve according to the basic opening degree, the first corrected opening degree and the second corrected opening degree.

[0103] On the basis of the above-mentioned embodiments of the application, the embodiments of the application further refine the determination of the actual growth rate of the first side pressure value according to the relationship between the first side pressure value and the first threshold value before the first side pressure value is determined according to the relationship between the first side pressure value and the first threshold value, Figure 4 is another flowchart of a control method of a vehicle electronic expansion valve provided by the embodiments of the application, with reference to Figure 4 The control method of the vehicle electronic expansion valve provided by the embodiments of the application further comprises:

[0104] S401, obtaining a battery temperature of the whole vehicle and a first side pressure value of the compressor.

[0105] S402, determining a basic opening degree of the electronic expansion valve according to the battery temperature, the first side pressure value and an opening degree characteristic table of the electronic expansion valve.

[0106] S403, determining a correction value of the electronic expansion valve according to the relationship between the total heat of the battery and a third threshold value.

[0107] Specifically, the total heat of the battery calculated in the above-mentioned step S309 of the battery is obtained, and the correction value of the electronic expansion valve is determined according to the relationship between the total heat of the battery and the third threshold value, wherein the third threshold value is a heat increase limit value of the battery, and the heat increase limit value is exemplarily 70% of the battery temperature, which will cause damage to the battery, and the correction value of the electronic expansion valve is determined according to the relationship between the total heat of the battery and the third threshold value.

[0108] S404, determining an actual growth rate of the first side pressure value according to the relationship between the first side pressure value and the first threshold value.

[0109] S405, determining a first correction opening degree of the electronic expansion valve according to the actual growth rate of the first side pressure value.

[0110] S406, determining an actual decline rate of a second side pressure value according to the relationship between the second side pressure value and a second threshold value.

[0111] S407, determining a second correction opening degree of the electronic expansion valve according to the actual decline rate of the second side pressure value.

[0112] S408, obtaining an ambient temperature of the whole vehicle, a charging current value of the battery and a discharging current value of the battery.

[0113] S409, determining a charging heat of the battery according to the ambient temperature and the charging current value, and determining a discharging heat of the battery according to the ambient temperature and the discharging current value.

[0114] S410, determining a total heat of the battery according to the charging heat and the discharging heat.

[0115] S411, determine the final opening degree of the electronic expansion valve according to the basic opening degree, the first correction opening degree and the second correction opening degree.

[0116] On the basis of the above-mentioned embodiments of the application, the embodiments of the application further refine the determination of the correction value of the electronic expansion valve according to the relationship between the total heat of the battery and the third threshold value, Figure 5 is another flowchart of the control method of the vehicle electronic expansion valve provided by the embodiments of the application, referring to Figure 5 The control method of the vehicle electronic expansion valve provided by the embodiments of the application further comprises:

[0117] S501, obtain the battery temperature of the whole vehicle and the first side pressure value of the compressor.

[0118] S502, determine the basic opening degree of the electronic expansion valve according to the battery temperature, the first side pressure value and the opening degree characteristic table of the electronic expansion valve.

[0119] S503, determine the correction value of the electronic expansion valve according to the relationship between the total heat of the battery and the third threshold value.

[0120] Specifically, the total heat of the battery of the whole vehicle calculated in the above-mentioned step S309 is obtained, and the correction value of the electronic expansion valve is determined according to the relationship between the total heat of the battery and the third threshold value.

[0121] S504, compare the total heat of the battery with the third threshold value.

[0122] Specifically, the size between the total heat of the battery of the whole vehicle determined in the above-mentioned step S503 and the third threshold value is compared, when the total heat of the battery of the whole vehicle is greater than or equal to the third threshold value, step S5042 is executed; when the total heat of the battery of the whole vehicle is less than the third threshold value, step S5041 is executed.

[0123] S5041, when the total heat of the battery is less than the third threshold value, determine the correction value of the electronic expansion valve as 0.

[0124] Specifically, when the total heat of the battery of the whole vehicle is less than the third threshold value, it indicates that the total heat of the battery of the whole vehicle at this time is low, and cooling is not needed, therefore, the correction value of the electronic expansion valve of the whole vehicle at this time is determined as 0, that is, the opening degree of the electronic expansion valve does not need to be adjusted to realize cooling.

[0125] S5042, when the total heat of the battery is greater than or equal to the third threshold value, determine the third correction opening degree of the electronic expansion valve according to the total heat of the battery.

[0126] Specifically, when the total battery heat of the vehicle calculated in the step S309 is greater than or equal to the third threshold value, a third corrected opening degree of the electronic expansion valve of the vehicle is determined according to the total battery heat of the vehicle. For example, the total battery heat calculated in the step S309 is 5000 joules, and the third threshold value is 4500 joules. In this case, the total battery heat of the vehicle is greater than the third threshold value, and the system needs to adjust the opening degree of the electronic expansion valve according to the heat value, i.e., the opening degree of the electronic expansion valve of the vehicle is adjusted from 40% to 60% to prevent performance degradation or safety hazards caused by the total battery heat being too high.

[0127] S505, determining an actual growth rate of the first side pressure value according to a relationship between the first side pressure value and the first threshold value.

[0128] S506, determining a first corrected opening degree of the electronic expansion valve according to the actual growth rate of the first side pressure value.

[0129] S507, determining an actual decline rate of the second side pressure value according to a relationship between the second side pressure value and the second threshold value.

[0130] S508, determining a second corrected opening degree of the electronic expansion valve according to the actual decline rate of the second side pressure value.

[0131] S509, obtaining an ambient temperature of the vehicle, a charging current value of the battery, and a discharging current value of the battery

[0132] S510, determining a charging heat of the battery according to the ambient temperature and the charging current value, and determining a discharging heat of the battery according to the ambient temperature and the discharging current value.

[0133] S511, determining a total heat of the battery according to the charging heat and the discharging heat.

[0134] S512, determining a final opening degree of the electronic expansion valve according to the basic opening degree, the first corrected opening degree, and the second corrected opening degree.

[0135] On the basis of the above-mentioned embodiment of the application, the embodiment of the application further refines the determination of the final opening degree of the electronic expansion valve according to the basic opening degree, the first corrected opening degree, and the second corrected opening degree, Figure 6 is another flowchart of the control method of the vehicle electronic expansion valve provided by the embodiment of the application, which is described with reference to Figure 6 The control method of the vehicle electronic expansion valve provided by the embodiment of the application further comprises:

[0136] S601, obtaining a battery temperature of the vehicle and a first side pressure value of the compressor.

[0137] S602, determining a basic opening degree of the electronic expansion valve according to the battery temperature, the first side pressure value, and an opening degree characteristic table of the electronic expansion valve.

[0138] S603, determining a correction value of the electronic expansion valve according to a relationship between the total heat of the battery and the third threshold value.

[0139] S604, when the total heat of the battery is greater than or equal to the third threshold value, determining a third correction opening degree of the electronic expansion valve according to the total heat of the battery.

[0140] S605, determining an actual increase rate of the first side pressure value according to a relationship between the first side pressure value and the first threshold value.

[0141] S606, determining a first correction opening degree of the electronic expansion valve according to the actual increase rate of the first side pressure value.

[0142] S607, determining an actual decrease rate of the second side pressure value according to a relationship between the second side pressure value and the second threshold value.

[0143] S608, determining a second correction opening degree of the electronic expansion valve according to the actual decrease rate of the second side pressure value.

[0144] S609, obtaining an ambient temperature of the whole vehicle, a charging current value of the battery and a discharging current value of the battery.

[0145] S610, determining a charging heat of the battery according to the ambient temperature and the charging current value, and determining a discharging heat of the battery according to the ambient temperature and the discharging current value.

[0146] S611, determining a total heat of the battery according to the charging heat and the discharging heat.

[0147] S612, determining a final opening degree of the electronic expansion valve according to the basic opening degree, the first correction opening degree, the second correction opening degree and the third correction opening degree of the electronic expansion valve.

[0148] Specifically, the final opening degree of the electronic expansion valve is determined according to the basic opening degree, the first correction opening degree, the second correction opening degree and the third correction opening degree of the electronic expansion valve calculated by the above steps S602, S606, S608 and S604, wherein the final opening degree of the electronic expansion valve is calculated by formula (two):

[0149] Duty=Duty0+DelDuty1+DelDuty2+DelDuty3(two)

[0150] Wherein, Duty is the final opening degree of the electronic expansion valve, Duty0 is the basic opening degree of the electronic expansion valve, DelDuty1 is the first correction opening degree of the electronic expansion valve, DelDuty2 is the second correction opening degree of the electronic expansion valve, and DelDuty3 is the third correction opening degree of the electronic expansion valve.

[0151] Optionally, the first side pressure value is obtained by a first pressure sensor installed between the compressor outlet and the condenser, and the second side pressure value is obtained by a second pressure sensor installed between the evaporator and the compressor.

[0152] The condenser is used to cool the high-temperature and high-pressure gaseous refrigerant into a medium-temperature and high-pressure liquid refrigerant, and the evaporator is used to evaporate the low-temperature and low-pressure liquid refrigerant into a low-temperature and low-pressure gaseous refrigerant to absorb heat.

[0153] Specifically, the first side pressure value (i.e., the high-pressure side pressure value) is obtained by a first pressure sensor installed between the compressor outlet and the condenser, reflecting the pressure state of the high-pressure side; and the second side pressure value (i.e., the low-pressure side pressure value) is obtained by a second pressure sensor installed between the evaporator and the compressor, reflecting the pressure state of the low-pressure side.

[0154] Optionally, the battery temperature is obtained by a temperature sensor installed on the surface of the battery.

[0155] Specifically, the temperature sensor can be installed on the surface of each module of the battery pack, and the temperature data monitored by the plurality of temperature sensors is transmitted to the battery management system (BMS) to obtain the battery temperature data of the whole vehicle.

[0156] According to the same inventive concept, Figure 7 is a control device block diagram of the vehicle electronic expansion valve provided by the embodiment of the present application, referring to Figure 7 The embodiment of the present application provides a control device of a vehicle electronic expansion valve, and the control device is used for executing the control method of any one of the vehicle electronic expansion valves in the above-mentioned embodiments.

[0157] The acquisition module 1 is used for acquiring the battery temperature of the whole vehicle and the first side pressure value of the compressor.

[0158] The calculation module 2 is used for determining the basic opening degree of the electronic expansion valve according to the battery temperature, the first side pressure value and the opening degree characteristic table of the electronic expansion valve; determining the actual growth rate of the first side pressure value according to the relationship between the first side pressure value and the first threshold value; determining the first correction opening degree of the electronic expansion valve according to the actual growth rate of the first side pressure value; and determining the final opening degree of the electronic expansion valve according to the basic opening degree and the first correction opening degree.

[0159] The control device of the vehicle electronic expansion valve provided by the embodiment of the present application can achieve the same technical effects as the control method of the vehicle electronic expansion valve provided by the above-mentioned embodiments, and details are not repeated here.

[0160] Optionally, referring back to Figure 7The acquisition module 1 is further configured to acquire an ambient temperature of the whole vehicle, a charging current value of the battery and a discharging current value of the battery; the calculation module 2 is further configured to determine a charging heat of the battery according to the ambient temperature and the charging current value; determine a discharging heat of the battery according to the ambient temperature and the discharging current value; and determine a total heat of the battery according to the charging heat and the discharging heat.

[0161] The control device of the electronic expansion valve for vehicle provided by the embodiment of the present application can achieve the same technical effects as the control method of the electronic expansion valve for vehicle provided by the above-mentioned embodiment of the present application, and thus will not be described here again.

[0162] According to the same inventive concept, the embodiment of the present application provides a control device of an electronic expansion valve for vehicle, characterized in that, comprising:

[0163] one or more processors;

[0164] a storage device configured to store one or more programs,

[0165] When the one or more programs are executed by the one or more processors, the one or more processors implement the control method of the electronic expansion valve for vehicle as in any one of the above-mentioned embodiments of the present application.

[0166] Figure 8 is a control device block diagram of the electronic expansion valve for vehicle provided by the embodiment of the present application, and the electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are merely examples, and are not intended to limit the implementation of the present application described and / or claimed herein.

[0167] As Figure 8As shown, the electronic device 10 includes at least one processor 11, and a memory, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., connected to the at least one processor 11 in communication. The memory stores a computer program executable by the at least one processor 11, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or loaded from the storage unit 18 into the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0168] A plurality of components in the electronic device 10 are connected to the I / O interface 15, including an input unit 16, such as a keyboard, a mouse, etc., an output unit 17, such as various types of displays, a loudspeaker, etc., a storage unit 18, such as a magnetic disk, an optical disk, etc., and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network, such as the Internet, and / or various telecommunication networks.

[0169] The processor 11 can be various general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 performs various methods and processes described above, such as the control method of the electronic expansion valve for vehicles.

[0170] According to the same inventive concept, the embodiments of the present application also provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the control method of the electronic expansion valve for vehicles according to any of the above embodiments of the present application.

[0171] The computer readable storage medium stores computer instructions for causing the processor to implement the control method of the electronic expansion valve for vehicle according to any one of the above embodiments of the present application when executed. In some embodiments, the control method of the electronic expansion valve for vehicle can be implemented as a computer program tangibly embodied in the computer readable storage medium. In the context of the present application, the computer readable storage medium can be a tangible medium that can contain or store the computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer readable storage medium can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium can be a machine readable signal medium. More specific examples of the machine readable storage medium will include one or more lines of electrical connection, portable computer diskette, hard disk, random access memory, read-only memory, erasable programmable read-only memory, optical fiber, portable compact disk read-only memory, optical storage device, magnetic storage device, or any suitable combination of the foregoing.

[0172] According to the same inventive concept, the embodiments of the present application also provide a vehicle comprising the control device of the electronic expansion valve for vehicle according to the above embodiments of the present application.

[0173] The above detailed description does not constitute a limitation on the protection scope of the present application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A control method of an electronic expansion valve for a vehicle, characterized by, The method comprises: acquiring a battery temperature of a whole vehicle and a first side pressure value of a compressor; determining a basic opening degree of an electronic expansion valve according to the battery temperature, the first side pressure value and an opening degree characteristic table of the electronic expansion valve; determining an actual increasing rate of the first side pressure value according to a relationship between the first side pressure value and a first threshold value; determining a first corrected opening degree of the electronic expansion valve according to the actual increasing rate of the first side pressure value; determining a final opening degree of the electronic expansion valve according to the basic opening degree and the first corrected opening degree; wherein the first threshold value is a falling limit value of a second side pressure value of the compressor; the first side pressure value of the compressor is greater than the second side pressure value of the compressor; when the first side pressure value is greater than or equal to the first threshold value, calculating the actual increasing rate of the first side pressure value according to the first side pressure value; when the first side pressure value is less than the first threshold value, the basic opening degree of the electronic expansion valve is the final opening degree of the electronic expansion valve.

2. The control method of the electronic expansion valve for vehicle according to claim 1, characterized by Before determining the final opening degree of the electronic expansion valve according to the basic opening degree and the first corrected opening degree, the method further comprises: determining an actual falling rate of the second side pressure value according to a relationship between the second side pressure value and a second threshold value; determining a second corrected opening degree of the electronic expansion valve according to the actual falling rate of the second side pressure value; determining the final opening degree of the electronic expansion valve according to the basic opening degree, the first corrected opening degree and the second corrected opening degree; wherein the second threshold value is a rising limit value of the first side pressure value of the compressor.

3. The control method of the electronic expansion valve for vehicle according to claim 2, characterized by Before determining the final opening degree of the electronic expansion valve according to the basic opening degree, the first corrected opening degree and the second corrected opening degree, the method further comprises: acquiring an ambient temperature of the whole vehicle, a charging current value of the battery and a discharging current value of the battery; determining a charging heat of the battery according to the ambient temperature and the charging current value; determining a discharging heat of the battery according to the ambient temperature and the discharging current value; determining a total heat of the battery according to the charging heat and the discharging heat.

4. The control method of the electronic expansion valve for vehicle according to claim 3, characterized by The total heat is generated according to a formula (one): Q=Q1+Q2 (one) wherein Q is the total heat of the battery, Q1 is the charging heat of the battery, and Q2 is the discharging heat of the battery.

5. The control method of the electronic expansion valve for vehicle according to claim 3, characterized by Before determining the actual increasing rate of the first side pressure value according to a relationship between the first side pressure value and a first threshold value, the method comprises: determining a correction value of the electronic expansion valve according to a relationship between the total heat of the battery and a third threshold value; wherein the third threshold value is a heat increasing limit value of the battery.

6. The control method of the electronic expansion valve for vehicle according to claim 5, characterized by Determining the correction value of the electronic expansion valve according to a relationship between the total heat of the battery and a third threshold value comprises: when the total heat of the battery is greater than or equal to the third threshold value, determining a third corrected opening degree of the electronic expansion valve according to the total heat of the battery; when the total heat of the battery is less than the third threshold value, determining that the correction value of the electronic expansion valve is 0.

7. The control method of the electronic expansion valve for vehicle according to claim 6, characterized by Determining the final opening degree of the electronic expansion valve according to the basic opening degree, the first corrected opening degree and the second corrected opening degree comprises: The final opening degree of the electronic expansion valve is determined based on the base opening degree of the electronic expansion valve, the first correction opening degree, the second correction opening degree, and the third correction opening degree.

8. The control method of the electronic expansion valve for vehicle according to claim 7, characterized by, The final opening degree of the electronic expansion valve is calculated based on Formula (II): Duty=Duty0+DelDuty1+DelDuty2+ DelDuty3 (II) wherein Duty is the final opening degree of the electronic expansion valve, Duty0 is the base opening degree of the electronic expansion valve, DelDuty1 is the first correction opening degree, DelDuty2 is the second correction opening degree, and DelDuty3 is the third correction opening degree.

9. The control method of the electronic expansion valve for vehicle according to claim 1, characterized by, The first side pressure value is obtained by a first pressure sensor installed between the compressor outlet and the condenser, and the second side pressure value is obtained by a second pressure sensor installed between the evaporator and the compressor.

10. The control method of the electronic expansion valve for vehicle according to claim 1, characterized by, The battery temperature is obtained by a temperature sensor installed on the surface of the battery.

11. A control device for an automotive electronic expansion valve, characterized in that, The control device is configured to perform the control method of the electronic expansion valve for a vehicle according to any one of claims 1-10, and the control device comprises: an obtaining module configured to obtain a battery temperature of the vehicle and a first side pressure value of the compressor; a calculating module configured to determine a base opening degree of the electronic expansion valve based on the battery temperature, the first side pressure value, and an opening degree characteristic table of the electronic expansion valve; determine an actual increase rate of the first side pressure value based on a relationship between the first side pressure value and a first threshold value; determine a first correction opening degree of the electronic expansion valve based on the actual increase rate of the first side pressure value; and determine a final opening degree of the electronic expansion valve based on the base opening degree and the first correction opening degree.

12. The control device of the electronic expansion valve for vehicle according to claim 11, characterized by The obtaining module is further configured to obtain an ambient temperature of the vehicle, a charging current value of the battery, and a discharging current value of the battery. The calculating module is further configured to determine a charging heat of the battery based on the ambient temperature and the charging current value; determine a discharging heat of the battery based on the ambient temperature and the discharging current value; and determine a total heat of the battery based on the charging heat and the discharging heat.

13. A control device for an electronic expansion valve for vehicles, characterized in that, comprising: one or more processors; a storage device for storing one or more programs, when the one or more programs are executed by the one or more processors, the one or more processors implement the control method of the electronic expansion valve for a vehicle according to any one of claims 1-10.

14. A computer readable storage medium having stored thereon a computer program, characterized in that, The program, when executed by a processor, implements the control method of the electronic expansion valve for a vehicle according to any one of claims 1-10.

15. A vehicle characterized by comprising: The control device of the electronic expansion valve for a vehicle according to claim 11 or 12.

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