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

Abstract

The invention discloses a control method, device and equipment for a vehicle electronic expansion valve, a storage medium and a vehicle. The control method comprises the steps that the battery temperature of the whole vehicle and the first side pressure value of a compressor are obtained; the basic opening degree of the electronic expansion valve is determined according to the battery temperature, the first side pressure value and an opening degree characteristic table of the electronic expansion valve; determining an actual increase 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 increase rate of the first side pressure value; and the final opening degree of the electronic expansion valve is determined according to the basic opening degree and the first correction opening degree. According to the control method of the vehicle electronic expansion valve, the opening degree of the electronic expansion valve is corrected based on the external environment temperature, the battery temperature and the high-pressure side pressure value of the compressor, when the battery has the temperature rising trend, the opening degree of the electronic expansion valve is controlled in advance, and the optimal cooling effect is achieved.

Description

Technical Field

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

[0002] To meet the cooling requirements of the battery, a thermal management unit is required to dissipate heat from the battery. Currently, the expansion valve in the vehicle thermal management unit is a mechanical expansion valve, which is opened by a temperature sensing bulb. The adjustment is insensitive and cannot adapt to the adjustment of the cooling capacity within a wide temperature range. In a low-temperature environment, such as -35 degrees Celsius, when the thermal management unit has a heat dissipation requirement, the mechanical expansion valve cannot be opened in time, resulting in the inability of the high-pressure end to vaporize in time, and the low-pressure end remaining in a vacuum state for a long time, unable to normally meet the temperature reduction requirements of the thermal management unit. The mechanical expansion valve can only adjust the valve opening through the temperature sensing bulb when the battery temperature rises and fluctuates greatly, and has hysteresis in control, and cannot achieve the best cooling effect. Summary of the Invention

[0003] The present invention provides a control method, device, equipment, storage medium and vehicle for a vehicle-mounted electronic expansion valve, which uses an electronic expansion valve to replace the mechanical expansion valve in the prior art, and corrects the opening of the electronic expansion valve based on the battery temperature, ambient temperature and the high-pressure side pressure value of the compressor, so as to determine the final opening of the electronic expansion valve through the basic opening and the corrected opening. When the battery has a rising trend, the opening of the electronic expansion valve is controlled in advance, rather than waiting until the battery temperature fluctuates greatly before adjusting the opening of the electronic expansion valve, so as to achieve the best cooling effect.

[0004] According to a first aspect of the present invention, there is provided a control method for a vehicle-mounted electronic expansion valve, including:

[0005] Obtaining the battery temperature of the whole vehicle and the first-side pressure value of the compressor;

[0006] Determining the basic opening of the electronic expansion valve according to the battery temperature, the first-side pressure value and the opening characteristic table of the electronic expansion valve;

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

[0008] Determining the first correction opening of the electronic expansion valve according to the actual growth rate of the first-side pressure value;

[0009] Determining the final opening of the electronic expansion valve according to the basic opening and the first correction opening; wherein, the first threshold is the decrease limit value of the 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.

[0010] Optionally, before determining the final opening degree of the electronic expansion valve according to the base opening degree and the first corrected opening degree, the method further includes:

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

[0012] Determining a second corrected opening degree of the electronic expansion valve according to the actual decrease rate of the second-side pressure value;

[0013] Determining the final opening degree of the electronic expansion valve according to the base opening degree, the first corrected opening degree, and the second corrected opening degree; wherein, the second threshold is an upper limit of an increase in a first-side pressure value of the compressor.

[0014] Optionally, before determining the final opening degree of the electronic expansion valve according to the base opening degree, the first corrected opening degree, and the second corrected opening degree, the method further includes:

[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 based on formula (1):

[0020] Q = Q 1 + Q 2 (1)

[0021] wherein, Q is the total heat of the battery, Q 1 is the charging heat of the battery, and Q 2 is the discharging heat of the battery.

[0022] Before determining an actual increase rate of the first-side pressure value according to a relationship between the first-side pressure value and a first threshold, the method includes:

[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; wherein, the third threshold is an upper limit of an increase in the heat 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 includes:

[0025] When the total heat of the battery is greater than or equal to the third threshold, determine the third corrected opening degree of the electronic expansion valve according to the total heat of the battery;

[0026] When the total heat of the battery is less than the third threshold, determine that the correction value of the electronic expansion valve is 0.

[0027] Optionally, 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 includes:

[0028] Determine the final opening degree of the electronic expansion valve according to the basic opening degree, the first corrected opening degree, the second corrected opening degree, and the third corrected opening degree of the electronic expansion valve.

[0029] Optionally, the final opening degree of the electronic expansion valve is calculated based on formula (II):

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

[0031] 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 corrected opening degree, DelDuty2 is the second corrected opening degree, and DelDuty3 is the third corrected opening 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 invention, there is provided a control device for a vehicle electronic expansion valve, the control device is used to execute any one of the control methods of the vehicle electronic expansion valve in the first aspect of the present invention, and the control device includes:

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

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

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

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

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

[0040] One or more processors;

[0041] A storage device for storing 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 for the vehicle electronic expansion valve as described in any one of the first aspects of the present invention.

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

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

[0045] The present invention provides a control method, device, equipment, storage medium and vehicle for a vehicle-mounted electronic expansion valve, including: obtaining the battery temperature of the whole vehicle and the first-side pressure value of the compressor; determining the basic opening degree of the electronic expansion valve according to the battery temperature, the first-side pressure value and the opening 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; determining the final opening degree of the electronic expansion valve according to the basic opening degree and the first correction opening degree; wherein, the first threshold value is the downward limit value of the 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. The control method for the vehicle-mounted electronic expansion valve provided by the present invention uses an electronic expansion valve to replace the mechanical expansion valve in the prior art, and corrects the opening degree of the electronic expansion valve based on the battery temperature, the ambient temperature and the high-side pressure value of the compressor, so as to determine the final opening degree of the electronic expansion valve through the basic opening degree and the corrected opening degree. When the battery has a warming trend, the opening degree of the electronic expansion valve is controlled in advance, rather than waiting until the battery temperature fluctuates greatly to adjust the opening degree of the electronic expansion valve, so as to achieve the best cooling effect.

[0046] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. Description of the Drawings

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0048] Figure 1 It is a flowchart of a control method for a vehicle-mounted electronic expansion valve provided by an embodiment of the present invention;

[0049] Figure 2 It is a flowchart of another control method for a vehicle-mounted electronic expansion valve provided by an embodiment of the present invention;

[0050] Figure 3 It is a flowchart of another control method for a vehicle-mounted electronic expansion valve provided by an embodiment of the present invention;

[0051] Figure 4 It is a flowchart of another control method for a vehicle-mounted electronic expansion valve provided by an embodiment of the present invention;

[0052] Figure 5It is a flowchart of another control method for a vehicle electronic expansion valve provided by an embodiment of the present invention;

[0053] Figure 6 It is a flowchart of another control method for a vehicle electronic expansion valve provided by an embodiment of the present invention;

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

[0055] Figure 8 It is a block diagram of a control device for a vehicle electronic expansion valve provided by an embodiment of the present invention. Detailed implementation manners

[0056] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

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

[0058] It should be understood that various forms of processes shown above can be used, steps can be reordered, added or deleted. For example, the steps recorded in the present invention can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solutions of the present invention can be achieved. This is not limited herein.

[0059] Figure 1 It is a flowchart of a control method for a vehicle electronic expansion valve provided by an embodiment of the present invention. Refer to Figure 1 , the control method for the vehicle electronic expansion valve provided by the embodiment of the present invention includes:

[0060] S101. Obtain 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 inside the vehicle to obtain the temperature value of the battery inside the whole vehicle; the compressor is responsible for compressing and delivering the refrigerant to ensure the normal operation of the air conditioning system inside the whole vehicle. 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 inside the whole vehicle and the first-side pressure value of the compressor are obtained. Since the pressure value on the high-pressure side inside the compressor is more sensitive than the pressure value on the low-pressure side, therefore, the first-side pressure value of the compressor obtained here is preferably the high-pressure side pressure value.

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

[0063] Among them, the electronic expansion valve is a precision flow control device used in the refrigeration or air conditioning system of the whole vehicle. By controlling the opening of the electronic expansion valve, the flow rate of the refrigerant can be accurately adjusted; the opening characteristic table of the electronic expansion valve is a table of ambient test temperature, battery test temperature, the first-side test pressure value of the compressor, and the basic opening of the electronic expansion valve formulated in advance through actual experimental test data, which reflects the different basic openings of the electronic expansion valve corresponding to different battery test temperatures and different first-side test pressure values of the compressor. Exemplarily, when the ambient temperature is -10°C, the battery test temperature is 5°C, and the first-side test pressure value of the compressor is 150 psi, the basic opening of the electronic expansion valve is adjusted to 30%; when the ambient temperature is 0°C, the battery test temperature is 15°C, and the first-side test pressure value of the compressor is 180 psi, the basic opening of the electronic expansion valve is adjusted to 30%; when the ambient temperature is 25°C, the battery test temperature is 30°C, and the first-side test pressure value of the compressor is 200 psi, the basic opening of the electronic expansion valve is adjusted to 50%; when the ambient temperature is 40°C, the battery test temperature is 45°C, and the first-side test pressure value of the compressor is 220 psi, the basic opening of the electronic expansion valve is adjusted to 60%. Measure the corresponding relationship between each ambient temperature, battery test temperature, the first-side test pressure value of the compressor, and the basic opening of the electronic expansion valve to form the opening characteristic table of the electronic expansion valve.

[0064] Specifically, determine the basic opening of the electronic expansion valve 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 characteristic table of the electronic expansion valve (i.e., the opening characteristic table of the electronic expansion valve formulated in advance through test data described above) to accurately adjust the air conditioning system of the whole vehicle.

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

[0066] Specifically, the first side pressure value is the first side pressure value of the compressor actually obtained by the pressure sensor in the above step S102. The first threshold value can be the lower limit value of the decrease in the second side pressure value of the compressor. Among them, 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, calculate the actual growth rate of the first side pressure value 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 (i.e., the output opening degree of the electronic expansion valve). Among them, the reason why the first threshold value is the lower limit value of the decrease in the second side pressure value of the compressor: 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 by the embodiment of the present invention creatively compares the first side pressure value (i.e., the high-pressure side pressure value) of the compressor with the lower limit value of the decrease in the second side pressure value (i.e., the low-pressure side pressure value of the compressor). For example, when the pressure value on the high-pressure side of the compressor rises 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 pressure value on the high-pressure side will still exceed the upper limit value of the high-pressure side pressure value (i.e., the solution of the prior art). Therefore, it is necessary to compare the high-pressure side pressure value with the limit value of the rapid decrease in the low-pressure side pressure (i.e., the first threshold value). 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. Determine the first correction opening degree of the electronic expansion valve according to the actual growth rate of the first side pressure value.

[0070] Specifically, determine the first correction opening degree of the electronic expansion valve according to the actual growth rate of the first side pressure value of the compressor determined in the above step S103. Exemplarily, 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. Determine the final opening degree of the electronic expansion valve according to the basic opening degree and the first correction opening degree.

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

[0073] The control method of the vehicle electronic expansion valve provided by the embodiment of the present invention uses an electronic expansion valve to replace the mechanical expansion valve in the prior art, and corrects the opening degree of the electronic expansion valve based on the battery temperature, the ambient temperature, and the high-side pressure value of the compressor, so as to determine the final opening degree of the electronic expansion valve through the basic opening degree and the corrected opening degree. When the battery has a tendency to warm up, the opening degree of the electronic expansion valve is controlled in advance, rather than waiting until the battery temperature fluctuates greatly before adjusting the opening degree of the electronic expansion valve, so as to achieve the best cooling effect.

[0074] On the basis of the above-mentioned embodiment of the invention, the embodiment of the invention further refines the process before determining the final opening degree of the electronic expansion valve according to the basic opening degree and the first correction opening degree. Figure 2 It is a flowchart of another control method of the vehicle electronic expansion valve provided by the embodiment of the present invention. Refer to Figure 2 , the control method of the electronic expansion valve provided by the embodiment of the present invention further includes:

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

[0076] S202. 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.

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

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

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

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

[0081] Among them, the reason for the second threshold being the upper limit of the rising value of the pressure on the first side of the compressor is as follows: In the prior art, the comparison is made between the low-pressure side and the lower limit value of the low-pressure side. The electronic expansion valve control method provided by the embodiments of the present invention creatively compares the pressure value on the second side of the compressor (i.e., the low-pressure side pressure value) with the lower limit value of the pressure drop on the first side (i.e., the high-pressure side pressure value of the compressor). For example, when the pressure value on the low-pressure side of the compressor drops close to the lower limit value of the pressure, it is too late to adjust the opening degree of the electronic expansion valve, and the low-pressure side pressure value will still be lower than the lower limit value of the low-pressure side pressure value (i.e., the solution of the prior art). Therefore, it is necessary to compare the low-pressure side pressure value with the upper limit value of the rapid increase in the high-pressure side pressure (i.e., the second threshold). When the drop 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. Determine the second correction opening degree of the electronic expansion valve according to the actual drop rate of the pressure on the second side.

[0083] Specifically, the second correction opening degree of the electronic expansion valve is determined according to the actual drop rate of the pressure on the second side of the compressor determined in the above step S103. Exemplarily, the pressure value on the second side of the compressor is 150 psi, the basic opening degree of the electronic expansion valve is 50%, and when the calculated actual drop rate of the pressure on the second side is 5 psi / min, the second correction opening degree of the electronic expansion valve is adjusted to -5%.

[0084] S207. 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.

[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 the above steps S202, S204, and S206 respectively: Basic opening degree 50% + First correction opening degree 10% + Second correction opening degree -5% = 45%.

[0086] Based on the above embodiments of the invention, the embodiments of the present invention further refine the process 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. Figure 3 It is another flowchart of the control method of the vehicle-mounted electronic expansion valve provided by the embodiments of the present invention. Refer to Figure 3 , the control method of the vehicle-mounted electronic expansion valve provided by the embodiments of the present invention further includes:

[0087] S301. Obtain the battery temperature of the whole vehicle and the pressure value on the first side of the compressor.

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

[0089] S303. Determine 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.

[0090] S304. Determine the first corrected opening degree of the electronic expansion valve according to the actual growth rate of the first side pressure value.

[0091] S305. Determine the actual decline rate of the second side pressure value according to the relationship between the second side pressure value and the second threshold value.

[0092] S306. Determine the second corrected opening degree of the electronic expansion valve according to the actual decline rate of the second side pressure value.

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

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

[0095] S308. Determine the charging heat of the battery according to the ambient temperature and the charging current value; determine the 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. Exemplarily, it can be calculated by the formula S = I 2 × R × T, where S is the charging / discharging heat, I is the internal resistance of the battery during charging / discharging, and T is the ambient temperature to calculate the charging heat and discharging heat of the battery.

[0097] S309. Determine the total heat of the battery according to the charging heat and the discharging heat.

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

[0099] Optionally, the total heat of the vehicle battery can be calculated by formula (1):

[0100] Q = Q1 + Q2 (1)

[0101] Where 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. Determine 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.

[0103] Based on the above embodiments of the invention, before 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, the embodiments of the invention are further refined. Figure 4 It is a flowchart of another control method for a vehicle electronic expansion valve provided by an embodiment of the invention. Refer to Figure 4 The control method for a vehicle electronic expansion valve provided by an embodiment of the invention further includes:

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

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

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

[0107] Specifically, obtain the total heat of the battery of the whole vehicle calculated in step S309 of the battery, and determine the correction value of the electronic expansion valve according to the relationship between the total heat of the battery and the third threshold. Among them, the third threshold is the heat increase limit value of the battery. Exemplarily, the heat increase limit value is that when the heat of the battery exceeds 70% of the battery temperature, it will cause damage to the battery. Determine the correction value of the electronic expansion valve according to the relationship between the total heat of the battery and the third threshold.

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

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

[0110] S406. Determine the actual decrease rate of the second side pressure value according to the relationship between the second side pressure value and the second threshold.

[0111] S407. Determine the second correction opening of the electronic expansion valve according to the actual decrease rate of the second side pressure value.

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

[0113] S409. Determine the charging heat of the battery according to the ambient temperature and the charging current value; determine the discharging heat of the battery according to the ambient temperature and the discharging current value.

[0114] S410. Determine the 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 based on the basic opening degree, the first correction opening degree, and the second correction opening degree.

[0116] Based on the above-mentioned embodiments of the invention, the embodiments of the invention 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. Figure 5 It is a flowchart of another control method for a vehicle electronic expansion valve provided by an embodiment of the invention. Refer to Figure 5 , the control method for a vehicle electronic expansion valve provided by an embodiment of the invention further includes:

[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 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.

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

[0121] S504. Compare the magnitude of the total heat of the battery with the third threshold.

[0122] Specifically, compare the magnitude between the total heat of the battery of the whole vehicle determined in step S503 above and the third threshold. When the total heat of the whole vehicle battery is greater than or equal to the third threshold, execute step S5042; when the total heat of the whole vehicle battery is less than the third threshold, execute step S5041.

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

[0124] Specifically, when the total heat of the whole vehicle battery is less than the third threshold, it indicates that the total heat of the whole vehicle battery at this time is relatively low and cooling is not required. Therefore, determine that the correction value of the whole vehicle electronic expansion valve at this time is 0, that is, there is no need to adjust the opening degree of the electronic expansion valve to achieve temperature reduction.

[0125] S5042. When the total heat of the battery is greater than or equal to the third threshold, 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 step S309 above is greater than or equal to the third threshold, the third corrected opening of the vehicle electronic expansion valve is determined according to the total heat of the vehicle. Exemplarily, in step S309 above, the total heat of the battery calculated is 5000 joules, and the third threshold is 4500 joules. At this time, the total battery heat of the vehicle is greater than the third threshold, and the system needs to adjust the opening of the electronic expansion valve according to the heat value, that is, adjust the opening of the vehicle electronic expansion valve from 40% to 60% to prevent performance degradation or safety hazards caused by excessive total battery heat.

[0127] S505. Determine the actual growth rate of the first-side pressure value according to the relationship between the first-side pressure value and the first threshold.

[0128] S506. Determine the first corrected opening of the electronic expansion valve according to the actual growth rate of the first-side pressure value.

[0129] S507. Determine the actual decline rate of the second-side pressure value according to the relationship between the second-side pressure value and the second threshold.

[0130] S508. Determine the second corrected opening of the electronic expansion valve according to the actual decline rate of the second-side pressure value.

[0131] S509. Obtain the ambient temperature of the vehicle, the charging current value of the battery, and the discharging current value of the battery

[0132] S510. Determine the charging heat of the battery according to the ambient temperature and the charging current value; determine the discharging heat of the battery according to the ambient temperature and the discharging current value.

[0133] S511. Determine the total heat of the battery according to the charging heat and the discharging heat.

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

[0135] Based on the above-mentioned invention embodiments, the embodiments of the present invention further refine the determination of the final opening of the electronic expansion valve according to the basic opening, the first corrected opening, and the second corrected opening. Figure 6 It is another flowchart of the control method of the vehicle electronic expansion valve provided by the embodiments of the present invention. Refer to Figure 6 , the control method of the vehicle electronic expansion valve provided by the embodiments of the present invention further includes:

[0136] S601. Obtain the battery temperature of the vehicle and the first-side pressure value of the compressor.

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

[0138] S603. 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.

[0139] S604. 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.

[0140] S605. Determine 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.

[0141] S606. Determine the first correction opening degree of the electronic expansion valve according to the actual growth rate of the first-side pressure value.

[0142] S607. Determine the actual decline rate of the second-side pressure value according to the relationship between the second-side pressure value and the second threshold value.

[0143] S608. Determine the second correction opening degree of the electronic expansion valve according to the actual decline rate of the second-side pressure value.

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

[0145] S610. Determine the charging heat of the battery according to the ambient temperature and the charging current value; determine the discharging heat of the battery according to the ambient temperature and the discharging current value.

[0146] S611. Determine the total heat of the battery according to the charging heat and the discharging heat.

[0147] S612. Determine the 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, determine the basic opening degree, the first correction opening degree, the second correction opening degree, and the third correction opening degree of the vehicle-mounted electronic expansion valve calculated according to the above steps S602, S606, S608, and S604 respectively to determine the final opening degree of the electronic expansion valve. Among them, the final opening degree of the vehicle-mounted electronic expansion valve is calculated by formula (2):

[0149] Duty = Duty0 + DelDuty1 + DelDuty2 + DelDuty3 (2)

[0150] Among them, 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] Among them, the condenser cools the high-temperature and high-pressure gaseous refrigerant into a medium-temperature and high-pressure liquid refrigerant; the evaporator evaporates the low-temperature and low-pressure liquid refrigerant into a low-temperature and low-pressure gaseous refrigerant, absorbing 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; 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 battery surface.

[0155] Specifically, the temperature sensor can be installed on the surfaces of each module of the battery pack, and the temperature data monitored by multiple 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 block diagram of a control device for a vehicle electronic expansion valve provided by an embodiment of the present invention. Refer to Figure 7 , an embodiment of the present invention provides a control device for a vehicle electronic expansion valve. The control device is used to execute any one of the control methods for the vehicle electronic expansion valve in the above-mentioned embodiments of the present invention. The control device includes:

[0157] An acquisition module 1, configured to acquire the battery temperature of the whole vehicle and the first side pressure value of the compressor;

[0158] A calculation module 2, configured to determine the basic opening of the electronic expansion valve according to the battery temperature, the first side pressure value, and the opening characteristic table of the electronic expansion valve; determine the actual growth rate of the first side pressure value according to the relationship between the first side pressure value and the first threshold; determine the first correction opening of the electronic expansion valve according to the actual growth rate of the first side pressure value; determine the final opening of the electronic expansion valve according to the basic opening and the first correction opening.

[0159] The control device for a vehicle electronic expansion valve provided by the embodiment of the present invention can achieve the same technical effects as the control method for a vehicle electronic expansion valve provided by the above-mentioned embodiment of the present invention, and will not be elaborated here.

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

[0161] The control device of a vehicle electronic expansion valve provided by an embodiment of the present invention can achieve the same technical effects as the control method of a vehicle electronic expansion valve provided by the above-mentioned embodiment of the invention, and will not be elaborated here.

[0162] According to the same inventive concept, an embodiment of the present invention provides a control device for a vehicle electronic expansion valve, which is characterized by including:

[0163] One or more processors;

[0164] A storage device for storing 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 a vehicle electronic expansion valve as described in any one of the above-mentioned embodiments of the invention.

[0166] Figure 8 FIG. is a block diagram of a control device for a vehicle electronic expansion valve provided by an embodiment of the present invention. The electronic device is intended to represent various forms of digital computers, such as, a laptop computer, a desktop computer, a workbench, a personal digital assistant, a server, a blade server, a mainframe computer, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as, a personal digital processor, a cellular phone, a smart phone, a wearable device (such as a helmet, glasses, a watch, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are only examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0167] Such as Figure 8As shown, the electronic device 10 includes at least one processor 11 and a memory communicatively connected to the at least one processor 11, such as read-only memory (ROM) 12, random access memory (RAM) 13, etc. Among them, the memory stores a computer program executable by the at least one processor. The processor 11 can execute various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program 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, ROM 12, and RAM 13 are connected to each other via a bus 14. The input / output (I / O) interface 15 is also connected to the bus 14.

[0168] Multiple 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, speakers, etc.; a storage unit 18, such as a disk, an optical disc, 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 dedicated 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 executes the various methods and processes described above, such as the control method of the automotive electronic expansion valve.

[0170] According to the same inventive concept, an embodiment of the present invention also provides a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, it implements the control method of any automotive electronic expansion valve in the above-mentioned embodiment of the invention.

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

[0172] According to the same inventive concept, an embodiment of the present invention further provides a vehicle, including the control device of the vehicle electronic expansion valve in the above embodiment of the invention.

[0173] The above specific embodiments do not constitute a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A control method for a vehicle electronic expansion valve, characterized in that: include: Obtain the battery temperature of the vehicle and the first side pressure value of the compressor; determining a basic opening of the electronic expansion valve according to the battery temperature, the first side pressure value and an opening 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 of the electronic expansion valve according to an actual growth rate of the first side pressure value; The final opening of the electronic expansion valve is determined according to the basic opening and the first modified opening; wherein the first threshold is the descending limit of the 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.

2. The control method of the vehicle electronic expansion valve according to claim 1, characterized in that: Before determining the final opening of the electronic expansion valve according to the basic opening and the first modified opening, the method further includes: 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; determining a second modified opening of the electronic expansion valve according to an actual decreasing rate of the second side pressure value; The final opening of the electronic expansion valve is determined according to the basic opening, the first modified opening and the second modified opening; wherein the second threshold is the rising limit of the pressure value on the first side of the compressor.

3. The control method of the vehicle electronic expansion valve according to claim 2, characterized in that: Before determining the final opening of the electronic expansion valve according to the basic opening, the first modified opening and the second modified opening, the method further includes: Obtain the vehicle's ambient temperature, battery charging current value, and battery discharging current value; Determining a charging heat amount of the battery according to the ambient temperature and the charging current value; Determining a discharge heat of the battery according to the ambient temperature and the discharge current value; The total heat of the battery is determined according to the charging heat and the discharging heat.

4. The control method of the vehicle electronic expansion valve according to claim 3, characterized in that: The total heat is calculated based on formula (1): Q = Q1 + Q2 (a) 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 vehicle electronic expansion valve according to claim 3, characterized in that: Before 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, the method includes: The correction value of the electronic expansion valve is determined according to the relationship between the total heat of the battery and a third threshold value; wherein the third threshold value is the heat increase limit value of the battery.

6. The control method of the vehicle electronic expansion valve according to claim 3, characterized in that: 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 includes: When the total heat of the battery is greater than or equal to the third threshold, determining a third modified opening 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, the correction value of the electronic expansion valve is determined to be 0.

7. The control method of the vehicle electronic expansion valve according to claim 6, characterized in that: Determining a final opening of the electronic expansion valve according to the basic opening, the first modified opening, and the second modified opening includes: A final opening of the electronic expansion valve is determined according to a basic opening of the electronic expansion valve, the first revised opening, the second revised opening, and the third revised opening.

8. The control method of the vehicle electronic expansion valve according to claim 7, characterized in that: The final opening of the electronic expansion valve is calculated based on formula (II): Duty=Duty0+DelDuty1+DelDuty2+DelDuty3(2) Among them, Duty is the final opening of the electronic expansion valve, Duty0 is the basic opening of the electronic expansion valve, DelDuty1 is the first corrected opening, DelDuty2 is the second corrected opening, and DelDuty3 is the third corrected opening.

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

11. A control device for an electronic expansion valve for a vehicle, characterized in that: The control device is used to execute the control method of the vehicle electronic expansion valve according to any one of claims 1 to 10, and the control device includes: An acquisition module, used to acquire the battery temperature of the entire vehicle and the first side pressure value of the compressor; A calculation module is used to determine the basic opening of the electronic expansion valve according to the battery temperature, the first-side pressure value and the opening characteristic table of the electronic expansion valve; determine the actual growth rate of the first-side pressure value according to the relationship between the first-side pressure value and a first threshold value; determine the first corrected opening of the electronic expansion valve according to the actual growth rate of the first-side pressure value; and determine the final opening of the electronic expansion valve according to the basic opening and the first corrected opening.

12. The control device for a vehicle electronic expansion valve according to claim 11, characterized in that: The acquisition module is also used to acquire the ambient temperature of the vehicle, the charging current value of the battery, and the discharging current value of the battery; The calculation module is also used to determine the charging heat of the battery according to the ambient temperature and the charging current value; determine the discharging heat of the battery according to the ambient temperature and the discharging current value; and determine the total heat of the battery according to the charging heat and the discharging heat.

13. A control device for an electronic expansion valve for a vehicle, characterized in that: include: 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 vehicle electronic expansion valve as described in any one of claims 1-10.

14. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, a control method for a vehicle electronic expansion valve as described in any one of claims 1 to 10 is implemented.

15. A vehicle, characterized in that: A control device comprising the vehicle electronic expansion valve as claimed in claim 11 or 12.

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