A valve opening degree control method and device, electronic equipment and storage medium

Abstract

Embodiments of the present application provide a valve opening control method and device, electronic equipment and storage medium, relating to the technical field of vehicles, which can control the opening of an electronic expansion valve in a battery cooling system according to the actual refrigeration demand of the battery cooling system, thereby more accurately allocating the required refrigeration supply of the battery cooling system. The valve opening control method comprises: determining the real-time heat generation power of the battery pack; determining the first opening value of the target electronic expansion valve corresponding to the real-time heat generation power and the real-time temperature of the battery pack based on the corresponding relationship between the heat generation power of the battery pack, the temperature of the battery pack and the opening value of the target electronic expansion valve; determining the first correction coefficient based on the target water inlet temperature and the real-time water inlet temperature of the battery pack; correcting the first opening value based on the first correction coefficient to determine the second opening value of the target electronic expansion valve; and adjusting the opening value of the target electronic expansion valve to the second opening value.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of vehicles, and in particular to a valve opening degree control method and device, an electronic device, and a storage medium. BACKGROUND

[0002] Currently, in a vehicle, an indoor evaporator refrigerant circuit and a battery cooler refrigerant circuit are in parallel connection. When it is necessary to simultaneously cool the passenger compartment and cool the power battery, the opening degree of an electronic expansion valve at the indoor evaporator end and the opening degree of an electronic expansion valve at the power battery end can be controlled respectively to control the refrigerant flow of the indoor evaporator refrigerant circuit and the battery cooler refrigerant circuit, and to cool the passenger compartment and the power battery.

[0003] In the related art, the actual superheat degree is determined based on the temperature and pressure value of the battery cooler, and then the electronic expansion valve at the power battery end is controlled based on the actual superheat degree. The above control strategy can cause the refrigerant flow distributed by the battery cooling circuit to be too large. First, the energy consumption of the compressor in the refrigeration system is increased. Second, the actual refrigeration supply of the battery cooling circuit is greater than the actual demand, causing waste of refrigeration resources. Third, in the case where the indoor evaporator needs a large refrigeration capacity or the performance of the compressor is limited, the refrigeration supply of the indoor evaporator is insufficient, thereby affecting the user experience in the passenger compartment. SUMMARY

[0004] Embodiments of the present application provide a valve opening degree control method and device, an electronic device, and a storage medium, which can control the opening degree of an electronic expansion valve in a battery cooling system according to the actual refrigeration demand of the battery cooling system, thereby more accurately distributing the required refrigeration supply of the battery cooling system.

[0005] In a first aspect, embodiments of the present application provide a valve opening degree control method, which comprises:

[0006] determining the real-time heat generation power of a battery pack;

[0007] determining a first opening degree value of a target electronic expansion valve corresponding to the real-time heat generation power and real-time temperature of the battery pack based on the corresponding relationship between the heat generation power of the battery pack, the temperature of the battery pack, and the opening degree value of the target electronic expansion valve, the target electronic expansion valve being an electronic expansion valve in a battery cooling system;

[0008] determining a first correction coefficient based on the actual water inlet temperature of the battery pack and a target water inlet temperature;

[0009] correcting the first opening degree value based on the first correction coefficient to determine a second opening degree value of the target electronic expansion valve;

[0010] adjust the opening value of the target electronic expansion valve to the second opening value.

[0011] In the embodiments of the present application, the heat generation power of the battery pack and the temperature of the battery pack can be considered to be positively correlated with the refrigeration demand of the battery cooling system, and the opening of the target electronic expansion valve in the battery cooling system is positively correlated with the refrigeration supply of the battery cooling system, that is, adjusting the opening of the target electronic expansion valve is equivalent to adjusting the refrigeration supply of the battery cooling system. On this basis, the first opening value of the target electronic expansion valve can be preliminarily determined according to the real-time heat generation power of the battery pack and the real-time temperature of the battery pack, that is, the real-time refrigeration demand of the battery cooling system is preliminarily determined. Then, the first opening value is corrected based on the first correction coefficient determined by the target water inlet temperature and the actual water inlet temperature of the battery pack, so as to obtain the second opening value of the target electronic expansion valve, that is, the refrigeration supply is further adjusted by the target temperature and the actual temperature of the refrigerant entering the battery pack, so that the refrigeration supply allocated to the battery cooling system can match the refrigeration demand of the battery cooling system, avoiding the increase of the energy consumption of the compressor and the waste of refrigeration resources, and at the same time, the indoor evaporator can also be allocated with sufficient refrigeration capacity under the condition that the indoor evaporator needs larger refrigeration capacity or the performance of the compressor is limited, so as to meet the refrigeration demand of the user in the passenger compartment.

[0012] Optionally, before determining the first opening value of the target electronic expansion valve corresponding to the real-time heat generation power and the real-time temperature of the battery pack based on the corresponding relationship among the heat generation power of the battery pack, the temperature of the battery pack and the opening value of the target electronic expansion valve, the method further comprises:

[0013] filtering the real-time heat generation power of the battery pack;

[0014] determining the first opening value of the target electronic expansion valve corresponding to the real-time heat generation power and the real-time temperature of the battery pack based on the corresponding relationship among the heat generation power of the battery pack, the temperature of the battery pack and the opening value of the target electronic expansion valve, comprising:

[0015] determining the first opening value of the target electronic expansion valve corresponding to the filtered real-time heat generation power and the real-time temperature of the battery pack based on the corresponding relationship among the heat generation power of the battery pack, the temperature of the battery pack and the opening value of the target electronic expansion valve.

[0016] In the embodiments of the present application, since the mass of the battery pack is generally large, the battery pack has large thermal inertia, which means that the refrigeration demand of the battery cooling system is stable in theory in a short time. However, the real-time heat generation efficiency of the battery pack can have large fluctuations in a short time. Therefore, the real-time heat generation efficiency of the battery pack can be filtered, and the refrigeration demand of the battery cooling system determined based on the real-time temperature of the battery pack is more accurate. Correspondingly, the refrigeration supply amount determined based on the above more accurate refrigeration demand is also more accurate.

[0017] Optionally, the filtering processing is low-pass filtering.

[0018] In the embodiments of the present application, by low-pass filtering the real-time heat generation power of the battery pack, low-frequency signals such as average heat generation power generated during charging and discharging can be retained, and high-frequency signals and fluctuations such as rapid fluctuations of heat generation power caused by instantaneous changes of current or voltage, and noise of the sensor can be filtered out, so that the smoothness and accuracy of the real-time heat generation power of the battery pack obtained after filtering are improved.

[0019] Optionally, the first opening value is corrected based on the first correction coefficient to determine a second opening value of the target electronic expansion valve.

[0020] The third opening value of the target electronic expansion valve is determined based on the correction of the first opening value based on the first correction coefficient.

[0021] A second correction coefficient is determined based on the actual evaporator temperature and the target evaporator temperature.

[0022] The second opening value of the target electronic expansion valve is determined based on the correction of the third opening value based on the second correction coefficient.

[0023] In the embodiments of the present application, after the refrigeration supply amount of the battery cooling system is adjusted based on the target temperature and the actual temperature of the refrigerant entering the battery pack, the refrigeration supply amount of the battery cooling system can be further adjusted based on the evaporator temperature, so as to improve the accuracy of the determined refrigeration supply amount of the battery cooling system, and avoid that more refrigeration supply amount is allocated to the battery cooling system when the actual temperature of the evaporator is higher than the target temperature of the evaporator.

[0024] Optionally, the second opening value of the target electronic expansion valve is determined based on the correction of the third opening value based on the second correction coefficient, including:

[0025] The fourth opening value of the target electronic expansion valve is determined based on the correction of the third opening value based on the second correction coefficient.

[0026] A third correction coefficient is determined based on the current vehicle speed and the water pump speed in the battery cooling system.

[0027] The fourth opening value is corrected based on the third correction coefficient to determine the second opening value of the target electronic expansion valve.

[0028] In this embodiment of the application, after adjusting the cooling supply of the battery cooling system based on the evaporator temperature, the cooling supply of the battery cooling system can be further adjusted by combining the current vehicle speed and the water pump speed in the battery cooling system, thereby improving the accuracy of the determined cooling supply of the battery cooling system.

[0029] Optionally, the third correction coefficient is negatively correlated with the current vehicle speed and positively correlated with the water pump speed.

[0030] In this embodiment, as the vehicle speed increases, the heat carried away by convection in the battery pack increases, thus reducing the amount of heat that the battery cooling system needs to remove through heat exchange with the coolant. Therefore, the third correction coefficient can be reduced, meaning the cooling supply of the battery cooling system can be appropriately reduced to match its cooling demand. Conversely, as the water pump speed increases, the water flow rate through the battery cooler increases per unit time, meaning the water flow rate requiring heat exchange increases. With the cooling supply of the battery cooling system remaining constant, the battery inlet water temperature will increase accordingly. Therefore, the third correction coefficient can be increased to appropriately increase the cooling supply of the battery cooling system, thus matching its cooling demand.

[0031] Optionally, the fourth opening value is corrected based on the third correction coefficient to determine the second opening value of the target electronic expansion valve, including:

[0032] The fourth opening value is corrected based on the third correction coefficient to determine the fifth opening value of the target electronic expansion valve;

[0033] A fourth correction factor is determined based on the ambient temperature and the real-time temperature of the battery pack.

[0034] The fifth opening value is corrected based on the fourth correction coefficient to determine the second opening value of the target electronic expansion valve.

[0035] In this embodiment, in addition to adjusting the cooling supply of the battery cooling system by combining the current vehicle speed and the water pump speed in the battery cooling system, the cooling supply of the battery cooling system can also be further adjusted by combining the real-time temperature of the battery pack and the ambient temperature, thereby improving the accuracy of the determined cooling supply of the battery cooling system.

[0036] In a second aspect, the embodiments of the present application provide a valve opening degree control device, which comprises:

[0037] a power determination unit configured to determine a real-time heat generation power of a battery pack;

[0038] an opening degree determination unit configured to determine, based on a correspondence between a heat generation power of the battery pack, a temperature of the battery pack and an opening degree value of a target electronic expansion valve, a first opening degree value of the target electronic expansion valve corresponding to the real-time heat generation power and the real-time temperature of the battery pack, the target electronic expansion valve being an electronic expansion valve in a battery cooling system;

[0039] a correction coefficient determination unit configured to determine a first correction coefficient based on a target water inlet temperature and a real-time water inlet temperature of the battery pack;

[0040] a correction unit configured to correct the first opening degree value based on the first correction coefficient to determine a second opening degree value of the target electronic expansion valve;

[0041] an adjustment unit configured to adjust the opening degree value of the target electronic expansion valve to the second opening degree value.

[0042] Optionally, the device further comprises:

[0043] a filtering unit configured to perform filtering processing on the real-time heat generation power of the battery pack;

[0044] The opening degree determination unit is specifically configured to:

[0045] determine, based on the correspondence between the heat generation power of the battery pack, the temperature of the battery pack and the opening degree value of the target electronic expansion valve, the first opening degree value of the target electronic expansion valve corresponding to the real-time heat generation power and the real-time temperature of the battery pack after filtering processing.

[0046] Optionally, the filtering processing is low-pass filtering.

[0047] Optionally, the correction unit comprises:

[0048] a first correction unit configured to correct the first opening degree value based on the first correction coefficient to determine a third opening degree value of the target electronic expansion valve;

[0049] a first determination unit configured to determine a second correction coefficient based on an actual evaporator temperature and a target evaporator temperature;

[0050] a second correction unit configured to correct the third opening degree value based on the second correction coefficient to determine the second opening degree value of the target electronic expansion valve.

[0051] Optionally, the second correction unit comprises:

[0052] a third correction unit configured to correct the third opening degree value based on the second correction coefficient to determine a fourth opening degree value of the target electronic expansion valve;

[0053] a second determination unit configured to determine a third correction coefficient based on a current vehicle speed and a water pump rotating speed in the battery cooling system;

[0054] a fourth correction unit configured to correct the fourth opening degree value based on the third correction coefficient to determine a second opening degree value of the target electronic expansion valve.

[0055] Optionally, the third correction coefficient is negatively correlated with the current vehicle speed and positively correlated with the water pump rotating speed.

[0056] Optionally, the fourth correction unit is specifically configured to:

[0057] correct the fourth opening degree value based on the third correction coefficient to determine a fifth opening degree value of the target electronic expansion valve;

[0058] determine a fourth correction coefficient based on an ambient temperature and a real-time temperature of the battery pack;

[0059] correct the fifth opening degree value based on the fourth correction coefficient to determine the second opening degree value of the target electronic expansion valve.

[0060] In a third aspect, an electronic device is provided, which comprises a memory for storing computer program instructions and a processor for executing the program instructions, wherein when the computer program instructions are executed by the processor, the electronic device is triggered to perform the steps of the method according to any one of the embodiments of the first aspect.

[0061] In a fourth aspect, a computer readable storage medium is provided, which is used to store computer instructions, and when the computer instructions are executed by a computer, the computer is caused to perform the steps of the method according to any one of the embodiments of the first aspect.

[0062] It should be understood that the second to fourth aspects of the embodiments of the present application are consistent with the technical solution of the first aspect of the embodiments of the present application, and the beneficial effects obtained by each aspect and the corresponding feasible implementation manner are similar, and will not be repeated. BRIEF DESCRIPTION OF DRAWINGS

[0063] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art based on the drawings without creative labor are within the protection scope of the present application.

[0064] Figure 1 An architecture diagram of a refrigeration system in a vehicle is provided for the embodiments of the present application.

[0065] Figure 2 A flowchart of a valve opening control method is provided for the embodiments of the present application.

[0066] Figure 3 A flowchart of a method for determining a first opening value of a target electronic expansion valve is provided for the embodiments of the present application.

[0067] Figure 4 A flowchart of a method for determining a second opening value is provided for the embodiments of the present application.

[0068] Figure 5 A flowchart of a method for determining a second opening value is provided for the embodiments of the present application.

[0069] Figure 6 A flowchart of a method for determining a second opening value is provided for the embodiments of the present application.

[0070] Figure 7 A flowchart of a valve opening control method is provided for the embodiments of the present application.

[0071] Figure 8 A structural diagram of a valve opening control device is provided for the embodiments of the present application.

[0072] Figure 9 A structural diagram of an electronic device is provided for the embodiments of the present application.

DETAILED DESCRIPTION

[0073] In order to better understand the technical solutions of the present application, the embodiments of the present application will be described in detail below with reference to the drawings.

[0074] It should be clear that the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the protection scope of the present application.

[0075] The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting thereof. The singular forms "a," "an," and "the" used in the embodiments of the present application and the appended claims are intended to include plural forms as well, unless the context clearly indicates otherwise.

[0076] Please refer to Figure 1 , a schematic diagram of a refrigeration system in a vehicle is provided. As shown in Figure 1 , the indoor evaporator refrigerant circuit 10 and the battery cooler refrigerant circuit 20 are in parallel structure. When it is required to simultaneously cool the passenger compartment and cool the power battery 301 in the cooling liquid circulating system 30, on the one hand, the opening value of the electronic expansion valve 101 in the evaporator refrigerant circuit 10 can be controlled to control the flow of the cooling liquid into the indoor evaporator 102. The cooling liquid, after entering the indoor evaporator 102, realizes the cooling of the passenger compartment through the principle of evaporative heat absorption. It should be understood that the greater the opening value of the electronic expansion valve 101, the greater the flow of the cooling liquid into the indoor evaporator 102, and the better the cooling effect in the passenger compartment; on the other hand, the opening value of the electronic expansion valve 201 in the battery cooler refrigerant circuit 20 can also be controlled to control the flow of the cooling liquid into the battery cooler 202. The cooling liquid entering the battery cooler 202 exchanges heat with the cooling liquid driven by the water pump 302 in the cooling liquid circulating system 30, thereby absorbing the heat of the cooling liquid in the cooling liquid circulating system 30 to reduce the temperature of the cooling liquid in the cooling liquid circulating system 30. After cooling, the cooling liquid flows through the power battery 301 to absorb the heat generated by the power battery 301 through heat exchange. The cooling liquid that has absorbed the heat generated by the power battery 301 exchanges heat again in the battery cooler 202 and releases the received heat, thereby reducing its own temperature to facilitate subsequent heat exchange of the power battery 301.

[0077] In the related art, the actual superheat degree is determined based on the temperature and pressure value of the battery cooler 202, and then the electronic expansion valve 201 in the battery cooler refrigerant circuit 20 is controlled based on the actual superheat degree. The above control strategy can cause the refrigerant flow distributed by the battery cooler refrigerant circuit 20 to be too large, which can increase the energy consumption of the compressor in the refrigeration system, cause the actual refrigeration capacity of the battery cooler refrigerant circuit 20 to be greater than the actual cooling demand of the power battery 301 and the heat exchange capacity of the power battery 301, and cause a large amount of refrigeration capacity to be wasted in the heat exchange of the cooling water circuit and the high-temperature air environment, resulting in waste of refrigeration resources, and cause the refrigerant flow of the indoor evaporator 102 to be insufficient under the condition that the indoor evaporator 102 requires a large refrigeration capacity or the performance of the compressor is limited, thereby affecting the user experience in the passenger compartment.

[0078] In view of this, the embodiment of the present application provides a valve opening control method, in which the heat generation power of the battery pack and the temperature of the battery pack can be considered to be positively correlated with the refrigeration demand of the battery cooling system, and the opening of the target electronic expansion valve in the battery cooling system is positively correlated with the refrigeration supply of the battery cooling system, that is, adjusting the opening of the target electronic expansion valve is equivalent to adjusting the refrigeration supply of the battery cooling system. On this basis, the first opening value of the target electronic expansion valve can be preliminarily determined according to the real-time heat generation power of the battery pack and the real-time temperature of the battery pack, that is, the real-time refrigeration demand of the battery cooling system is used to preliminarily determine the refrigeration supply. Then, the first opening value is corrected based on the first correction coefficient determined by the target water inlet temperature and the actual water inlet temperature of the battery pack, so as to obtain the second opening value of the target electronic expansion valve, that is, the target temperature and the actual temperature of the refrigerant entering the battery pack are used to further adjust the refrigeration supply, so that the refrigeration supply allocated to the battery cooling system can match the refrigeration demand of the battery cooling system, avoiding the increase of the energy consumption of the compressor and the waste of refrigeration resources, and at the same time, when the indoor evaporator needs a larger refrigeration capacity or the performance of the compressor is limited, the indoor evaporator can also be allocated with sufficient refrigeration capacity, so as to meet the refrigeration demand of the user in the passenger compartment.

[0079] The technical solutions provided by the embodiments of the present application will be described below in conjunction with the accompanying drawings. In the following description, the application scenario shown in Figure 1 is taken as an example. Please refer to Figure 2 , a flowchart of a valve opening control method provided by the embodiments of the present application is provided, which can be applied to a thermal management controller, and the flow of the method is described as follows:

[0080] Step 401: Determine the real-time heat generation power of the battery pack.

[0081] In the embodiments of the present application, the remaining capacity (State of Charge, SOC) of the battery pack, the temperature of the battery pack and the current of the battery pack can be measured in the battery management system (Battery Management System, BMS). On this basis, the thermal management controller can obtain the above-mentioned SOC, temperature and current from the battery management system, and then determine the real-time SOC of the battery pack and the real-time temperature of the battery pack based on the corresponding relationship between the SOC of the battery pack, the temperature of the battery pack and the internal resistance of the battery pack. Then, the real-time heat generation power of the battery pack is determined based on the current of the battery pack and the real-time internal resistance of the battery pack. Of course, if the battery management system itself has calculated the real-time heat generation power of the battery pack, the thermal management controller can also directly obtain the real-time heat generation power of the battery pack from the battery management system.

[0082] Step 402: Based on the corresponding relationship between the heat generation power of the battery pack, the temperature of the battery pack, and the opening value of the target electronic expansion valve, the real-time heat generation power of the battery pack and the first opening value of the target electronic expansion valve corresponding to the real-time temperature of the battery pack are determined.

[0083] In the embodiments of the present application, the heat generation power of the battery pack and the temperature of the battery pack can be considered to be positively correlated with the refrigeration demand of the battery cooling system, that is, the greater the heat generation power of the battery pack, the greater the refrigeration demand of the battery cooling system, and similarly, the higher the temperature of the battery pack, the greater the refrigeration demand of the battery cooling system. The opening of the target electronic expansion valve (corresponding to the electronic expansion valve 201 in the foregoing embodiment) in the battery cooling system is positively correlated with the refrigeration supply of the battery cooling system, that is, the greater the opening of the target electronic expansion valve, the greater the refrigeration supply of the battery cooling system. On this basis, the first opening value of the target electronic expansion valve corresponding to the real-time heat generation power of the battery pack and the real-time temperature of the battery pack can be determined according to the pre-labeled corresponding relationship between the heat generation power of the battery pack, the temperature of the battery pack, and the opening value of the target electronic expansion valve. It should be understood that when labeling the above corresponding relationship, it is based on the principle that the refrigeration demand corresponding to the heat generation power of the battery pack and the temperature of the battery pack is matched with the refrigeration supply corresponding to the opening of the target electronic expansion valve. Therefore, it can be considered that when the target electronic expansion valve is at the first opening value, the heat dissipation demand of the battery pack under the current real-time heat generation power and real-time temperature can be met. Figure 1

[0084] In some embodiments, considering that the real-time heat generation power of the battery pack can fluctuate greatly in a short time, for example, the battery pack performs high-power charging and discharging operation in a short time, or the external device load of the battery pack suddenly changes, etc. From the perspective of the real-time heat generation power of the battery pack, the refrigeration demand of the battery pack will fluctuate greatly, which means that the refrigeration supply determined based on the above corresponding relationship will also fluctuate greatly. However, in fact, since the mass of the battery pack is usually large, the battery pack has large thermal inertia, which means that theoretically the refrigeration demand of the battery cooling system is stable in a short time. Therefore, in the case that the real-time heat generation power of the battery pack fluctuates greatly, the determined refrigeration supply will not match the actual refrigeration demand of the battery cooling system.

[0085] Please refer to Figure 3 , a flowchart of a method for determining the first opening value of the target electronic expansion valve provided by the embodiments of the present application. Before step 402 is performed, step 501 can also be performed.

[0086] Step 501: Perform filtering processing on the real-time heat generation power of the battery pack.

[0087] ​Step 402 can be implemented by performing sub-step 502 in particular:

[0088] Step 502: based on the correspondence between the heat generation power of the battery pack, the temperature of the battery pack and the opening value of the target electronic expansion valve, the first opening value of the target electronic expansion valve corresponding to the real-time heat generation power and the real-time temperature of the battery pack after filtering processing is determined.

[0089] In the embodiments of the present application, the real-time heat generation power of the battery pack can be low-pass filtered, so as to retain low-frequency signals, for example, the average heat generation power generated in the charging and discharging process, while filtering out high-frequency signals and fluctuations, for example, the rapid fluctuations of the heat generation power caused by the instantaneous changes of the current or voltage, and the noise of the sensor, etc., so as to ensure the smoothness and accuracy of the real-time heat generation power of the battery pack after filtering. On this basis, the refrigeration demand of the battery cooling system determined in combination with the real-time temperature of the battery pack is more accurate, and accordingly, the refrigeration supply amount determined based on the above more accurate refrigeration demand is also more accurate.

[0090] Step 403: based on the actual water inlet temperature of the battery pack and the target water inlet temperature, a first correction coefficient is determined.

[0091] In the embodiments of the present application, the battery pack usually has an optimal working temperature range, and within this optimal working temperature range, the battery pack can exert the best performance and prolong the service life. The target water inlet temperature of the battery pack refers to the ideal temperature of the cooling liquid when entering the battery pack for heat exchange in order to maintain the battery pack within the optimal working temperature range. Therefore, the difference between the actual water inlet temperature and the target water inlet temperature of the battery pack can also be considered as one of the factors affecting the current refrigeration demand of the battery cooling system. Then the first correction coefficient can be determined according to the difference between the actual water inlet temperature and the target water inlet temperature of the battery pack. It should be understood that the difference between the actual water inlet temperature and the target water inlet temperature is positively correlated with the first correction coefficient. That is, under the condition that the target water inlet temperature is certain, the more the actual water inlet temperature is higher than the target water inlet temperature, the greater the first correction coefficient is. And the greater the first correction coefficient is, the more the refrigeration supply amount that needs to be supplemented is.

[0092] It is worth noting that the above-mentioned first correction coefficient can be a multiplication correction coefficient or an addition correction coefficient, which is not particularly limited in the present application.

[0093] Step 404: based on the first correction coefficient, the first opening value is corrected to determine the second opening value of the target electronic expansion valve.

[0094] In the embodiments of the present application, since the difference between the actual water inlet temperature of the battery pack and the target water inlet temperature can also be considered as one of the factors affecting the refrigeration demand of the current battery cooling system, the first correction coefficient determined based on the difference between the actual water inlet temperature of the battery pack and the target water inlet temperature can be used to correct the first opening value of the target electronic expansion valve, so as to determine the second opening value of the target electronic expansion valve. That is, the refrigeration supply amount obtained in step 402 is fine-tuned by the refrigeration demand corresponding to the difference between the actual water inlet temperature and the target water inlet temperature.

[0095] In some embodiments, if Figure 1 In the case where the indoor evaporator refrigerant circuit 10 and the battery cooler refrigerant circuit 20 are operated at the same time, in most scenarios, it is generally desirable to prioritize the refrigeration supply in the indoor evaporator refrigerant circuit 10, so as to ensure the user's experience. Therefore, in the embodiments of the present application, the refrigeration supply of the battery cooling system can be adjusted based on the refrigeration of the indoor evaporator 102.

[0096] Please refer to Figure 4 A flowchart of a method for determining the second opening value is provided in the embodiments of the present application. Step 404 can be implemented by executing sub-steps 503 to 505:

[0097] Step 503: correcting the first opening value based on the first correction coefficient to determine the third opening value of the target electronic expansion valve.

[0098] Step 504: determining a second correction coefficient based on the actual evaporator temperature and the target evaporator temperature.

[0099] Step 505: correcting the third opening value based on the second correction coefficient to determine the second opening value of the target electronic expansion valve.

[0100] In the embodiments of the present application, the target evaporator temperature refers to the ideal evaporator working temperature set for passenger comfort requirements. The greater the difference between the actual evaporator temperature and the target evaporator temperature, the more the actual evaporator temperature is higher than the target evaporator temperature, which means Figure 1 The indoor evaporator refrigerant circuit 10 needs more refrigeration capacity to gradually reduce the temperature difference between the actual evaporator temperature and the target evaporator temperature to 0 in the ideal state. At this time, the refrigeration supply of the battery cooling system can be adaptively reduced accordingly, so as to prioritize the refrigeration demand in the passenger compartment under the condition of a certain refrigeration supply.

[0101] Therefore, after the initial refrigeration supply amount (corresponding to the first opening value of the target electronic expansion valve) of the battery cooling system is fine-tuned by the refrigeration demand corresponding to the difference between the actual water inlet temperature of the battery pack and the target water inlet temperature, so as to obtain the fine-tuned refrigeration supply amount (the third opening value of the target electronic expansion valve), the second correction coefficient can be determined based on the difference between the actual evaporator temperature and the target evaporator temperature, and the third opening value is corrected based on the second correction coefficient, so as to obtain the second opening value of the target electronic expansion valve. That is, the refrigeration supply amount of the battery cooling system is further adjusted by the second correction coefficient, so as to improve the accuracy of the determined refrigeration supply amount of the battery cooling system and ensure the refrigeration demand of the passenger compartment.

[0102] It should be understood that as long as the difference between the actual evaporator temperature and the target evaporator temperature is not 0, the second correction coefficient is needed to reduce the third opening value, and the greater the difference between the actual evaporator temperature and the target evaporator temperature, the more the second correction coefficient will be reduced (that is, the difference between the actual evaporator temperature and the target evaporator temperature is negatively correlated with the second correction coefficient), and then the second correction coefficient will also reduce the third opening value more, that is, the refrigeration supply amount of the battery cooling system will be reduced. The part of the refrigeration supply amount of the battery cooling system that is reduced can be considered to be distributed to the indoor evaporator refrigerant circuit 10 in the air conditioner 1, so that the indoor evaporator can obtain more refrigeration capacity. Figure 1

[0103] It should be noted that the above-mentioned second correction coefficient can be a multiplication correction coefficient or an addition correction coefficient, and the present application does not make special limitation thereto.

[0104] In some embodiments, considering that the vehicle speed and the water pump speed will also affect the refrigeration demand of the battery cooling system, the refrigeration supply amount of the battery cooling system can be adjusted based on the vehicle speed and the water pump speed.

[0105] Please refer to Figure 5 A flowchart of a method for determining the second opening value provided by the embodiments of the present application is shown. Step 505 can be implemented by executing sub-steps 601 to 603:

[0106] Step 601: Correcting the third opening value based on the second correction coefficient to determine the fourth opening value of the target electronic expansion valve.

[0107] Step 602: Determining the third correction coefficient based on the current vehicle speed and the water pump speed in the battery cooling system.

[0108] Step 603: Correcting the fourth opening value based on the third correction coefficient to determine the second opening value of the target electronic expansion valve.

[0109] ​In the embodiments of the present application, the fourth opening degree value of the target electronic expansion valve can be obtained by correcting the third opening degree value by the second correction coefficient determined by the difference between the actual evaporator temperature and the target evaporator temperature, that is, the refrigeration supply amount of the battery cooling system is adjusted by the second correction coefficient. On this basis, the third correction coefficient can be determined by combining the current vehicle speed and the water pump speed in the battery cooling system to correct the fourth opening degree value, so as to obtain the second opening degree value of the target electronic expansion valve. That is, the refrigeration supply amount of the battery cooling system is further adjusted by the third correction coefficient, so as to improve the accuracy of the determined refrigeration supply amount of the battery cooling system.

[0110] For example, under the condition that the water pump speed is constant, when the vehicle speed increases, it can be considered that the heat taken away by the convection mode in the battery pack will increase, and then the heat that needs to be absorbed by the coolant in the battery cooling system in the form of heat exchange will correspondingly decrease. At this time, the third correction coefficient determined based on the water pump speed and the current vehicle speed will correspondingly decrease (that is, the vehicle speed and the third correction coefficient are negatively correlated), that is, the third correction coefficient is used to reduce the fourth opening degree value, so as to reduce the refrigeration supply amount of the battery cooling system, and the greater the vehicle speed, the greater the reduction of the fourth opening degree value, and correspondingly, the greater the reduction of the refrigeration supply amount of the battery cooling system, so that the refrigeration supply amount of the battery cooling system matches the refrigeration demand thereof.

[0111] For example, under the condition that the vehicle speed is constant, when the water pump speed increases, it can be considered that the water flow rate flowing through the battery cooler per unit time increases, that is, the water flow rate that needs to be heat exchanged per unit time increases, and then under the condition that the refrigeration supply amount of the battery cooling system is constant, the battery water inlet temperature will correspondingly increase, which means that the refrigeration demand of the battery cooling system will increase. At this time, the third correction coefficient can be increased (that is, the water pump speed and the third correction coefficient are positively correlated), that is, the third correction coefficient is used to appropriately increase the fourth opening degree value, so as to increase the refrigeration supply amount of the battery cooling system, and the greater the water pump speed, the greater the increase of the fourth opening degree value, and correspondingly, the greater the increase of the refrigeration supply amount of the battery cooling system, so that the refrigeration supply amount of the battery cooling system matches the refrigeration demand thereof.

[0112] It is worth noting that under the condition that the vehicle speed is constant, when the water pump speed increases, the heat taken away by the convection mode in the battery pack will also increase slightly, from this point of view, the third correction coefficient should decrease slightly, but from the perspective of the battery water inlet temperature, the third correction coefficient needs to be increased, therefore, under the condition that the above two factors are superimposed, it can be considered that under the condition that the vehicle speed is constant, when the water pump speed increases, the third correction coefficient will remain unchanged or increase slightly.

[0113] It is worth noting that the third correction coefficient described above can be a multiplication correction coefficient or an addition correction coefficient, and the present application does not make special restrictions thereon.

[0114] In some embodiments, considering that the ambient temperature also affects the refrigeration demand of the battery cooling system, therefore, the refrigeration supply amount of the battery cooling system can be adjusted based on the ambient temperature.

[0115] See Figure 6 A flowchart of a method for determining a second opening degree value is provided for the embodiments of the present application. Step 603 can be implemented by executing sub-steps 6031 to 6033.

[0116] Step 6031: correcting the fourth opening degree value based on the third correction coefficient to determine the fifth opening degree value of the target electronic expansion valve.

[0117] Step 6032: determining the fourth correction coefficient based on the difference between the ambient temperature and the real-time temperature of the battery pack.

[0118] Step 6033: correcting the fifth opening degree value based on the fourth correction coefficient to determine the second opening degree value of the target electronic expansion valve.

[0119] In the embodiments of the present application, the third correction coefficient determined by the current vehicle speed and the water pump speed is used to correct the fourth opening degree value to obtain the fifth opening degree value of the target electronic expansion valve, that is, to adjust the refrigeration supply amount of the battery cooling system through the third correction coefficient. On this basis, the fourth correction coefficient can be determined based on the difference between the ambient temperature and the real-time temperature of the battery pack to correct the fifth opening degree value, thereby obtaining the second opening degree value of the target electronic expansion valve. That is, to further adjust the refrigeration supply amount of the battery cooling system through the fourth correction coefficient, thereby improving the accuracy of the determined refrigeration supply amount of the battery cooling system.

[0120] For example, if the difference between the ambient temperature and the real-time temperature of the battery pack is greater, it means that the ambient temperature is higher than the real-time temperature of the battery pack, and the heat transfer from the external environment to the battery pack will be more significant, thereby indirectly causing the real-time temperature of the battery pack to also increase. At this time, the fourth correction coefficient should be increased accordingly (that is, the difference between the ambient temperature and the real-time temperature of the battery pack is positively correlated with the fourth correction coefficient), that is, the fourth correction coefficient is used to increase the fifth opening degree value, thereby increasing the refrigeration supply amount of the battery cooling system to offset the trend of the real-time temperature of the battery pack increasing due to the higher ambient temperature.

[0121] It is worth noting that the fourth correction coefficient described above can be a multiplication correction coefficient or an addition correction coefficient, and the present application does not make special restrictions thereon.

[0122] Step 405: adjust the opening value of the target electronic expansion valve to a second opening value.

[0123] In the embodiment of the present application, when the opening value of the target electronic expansion valve is the second opening value, it can be considered that the refrigeration supply amount of the battery cooling system matches the refrigeration demand amount of the battery cooling system, avoiding increasing the energy consumption of the compressor and avoiding wasting refrigeration resources, and at the same time, when the indoor evaporator needs a larger refrigeration amount or the performance of the compressor is limited, the indoor evaporator can also be allocated sufficient refrigeration amount to meet the refrigeration demand of the user in the passenger compartment.

[0124] Please refer to Figure 7 The overall flowchart of a valve opening control method provided in the embodiment of the present application is shown in FIG. 7. The flowchart of the method is described as follows.

[0125] Step 701: determine the real-time heat generation power of the battery pack.

[0126] Step 702: perform filtering processing on the real-time heat generation power of the battery pack.

[0127] Step 703: determine the opening OA of the target electronic expansion valve corresponding to the real-time heat generation power and the real-time temperature of the battery pack after filtering processing based on the corresponding relationship between the heat generation power of the battery pack, the temperature of the battery pack and the opening value of the target electronic expansion valve.

[0128] Step 704: determine the first correction coefficient based on the actual water inlet temperature of the battery pack and the target water inlet temperature.

[0129] Step 705: correct the opening OA based on the first correction coefficient to determine the opening OB of the target electronic expansion valve.

[0130] In the embodiment of the present application, if the first correction coefficient is a multiplication correction coefficient F_01, then the opening OB = OA*F_01; if the first correction coefficient is an addition correction coefficient A_01, then the opening OB = OA+A_01.

[0131] Step 706: determine the second correction coefficient based on the actual evaporator temperature and the target evaporator temperature.

[0132] Step 707: correct the opening OB based on the second correction coefficient to determine the opening OC of the target electronic expansion valve.

[0133] In the embodiment of the present application, if the second correction coefficient is a multiplication correction coefficient F_02, then the opening OC = OB*F_02; if the second correction coefficient is an addition correction coefficient A_02, then the opening OC = OB+A_02.

[0134] Step 708: determine the third correction coefficient based on the current vehicle speed and the water pump speed in the battery cooling system.

[0135] Step 709: The opening degree OC is corrected based on the third correction coefficient, and the opening degree OD of the target electronic expansion valve is determined.

[0136] In the embodiment of the present application, if the third correction coefficient is a multiplication correction coefficient F_03, the opening degree OD = OC*F_03; if the third correction coefficient is an addition correction coefficient A_03, the opening degree OD = OC+A_03.

[0137] Step 710: The fourth correction coefficient is determined based on the ambient temperature and the real-time temperature of the battery pack.

[0138] Step 711: The opening degree OD is corrected based on the fourth correction coefficient, and the opening degree OF of the target electronic expansion valve is determined.

[0139] In the embodiment of the present application, if the fourth correction coefficient is a multiplication correction coefficient F_04, the opening degree OF = OD*F_04; if the fourth correction coefficient is an addition correction coefficient A_04, the opening degree OF = OD+A_04.

[0140] Step 712: The opening degree of the target electronic expansion valve is adjusted to the opening degree OF.

[0141] It is worth noting that the technical solution protected by the embodiment of the present application can be applied to vehicles equipped with a vehicle-mounted air conditioner, and can also be applied to vehicles equipped with a vehicle-mounted air conditioner and a heat pump air conditioner, and the present application does not make special limitations.

[0142] Please refer to Figure 8 A valve opening degree control device is provided for the embodiment of the present application, which comprises:

[0143] The power determination unit 801 is configured to determine the real-time heat generation power of the battery pack.

[0144] The opening degree determination unit 802 is configured to determine the first opening degree value of the target electronic expansion valve corresponding to the real-time heat generation power and the real-time temperature of the battery pack based on the corresponding relationship between the heat generation power of the battery pack, the temperature of the battery pack and the opening degree value of the target electronic expansion valve.

[0145] The correction coefficient determination unit 803 is configured to determine the first correction coefficient based on the target water inlet temperature and the real-time water inlet temperature of the battery pack.

[0146] The correction unit 804 is configured to correct the first opening degree value based on the first correction coefficient, and determine the second opening degree value of the target electronic expansion valve.

[0147] The adjustment unit 805 is configured to adjust the opening degree value of the target electronic expansion valve to the second opening degree value.

[0148] Optionally, the device further comprises:

[0149] a filtering unit configured to filter the real-time heat generation power of the battery pack;

[0150] The opening degree determination unit 802 is specifically configured to:

[0151] determine the first opening degree value of the target electronic expansion valve corresponding to the real-time heat generation power and the real-time temperature of the battery pack after the filtering processing, based on the correspondence between the heat generation power of the battery pack, the temperature of the battery pack and the opening degree value of the target electronic expansion valve.

[0152] Optionally, the filtering processing is low-pass filtering.

[0153] Optionally, the correction unit 804 comprises:

[0154] a first correction unit configured to correct the first opening degree value based on a first correction coefficient, and determine a third opening degree value of the target electronic expansion valve;

[0155] a first determination unit configured to determine a second correction coefficient based on the actual evaporator temperature and the target evaporator temperature;

[0156] a second correction unit configured to correct the third opening degree value based on the second correction coefficient, and determine a second opening degree value of the target electronic expansion valve.

[0157] Optionally, the second correction unit comprises:

[0158] a third correction unit configured to correct the third opening degree value based on the second correction coefficient, and determine a fourth opening degree value of the target electronic expansion valve;

[0159] a second determination unit configured to determine a third correction coefficient based on the current vehicle speed and the water pump speed in the battery cooling system;

[0160] a fourth correction unit configured to correct the fourth opening degree value based on the third correction coefficient, and determine the second opening degree value of the target electronic expansion valve.

[0161] Optionally, the third correction coefficient is negatively correlated with the current vehicle speed and positively correlated with the water pump speed.

[0162] Optionally, the fourth correction unit is specifically configured to:

[0163] correct the fourth opening degree value based on the third correction coefficient, and determine a fifth opening degree value of the target electronic expansion valve;

[0164] determine a fourth correction coefficient based on the ambient temperature and the real-time temperature of the battery pack;

[0165] The fourth correction coefficient is used to correct the fifth opening value, and a second opening value of the target electronic expansion valve is determined.

[0166] Please refer to Figure 9 , based on the same inventive concept, the electronic device provided in the embodiments of the present application also includes at least one processor 901, and the processor 901 is used to execute the computer program stored in the memory, so as to realize the method for controlling the valve opening provided in the embodiments of the present application, as shown in the flowchart of the method for controlling the valve opening. Figures 2-7

[0167] Optionally, the processor 901 can be a central processor, a specific ASIC, and can be one or more integrated circuits for controlling program execution.

[0168] Optionally, the electronic device can also include a memory 902 connected with the at least one processor 901, and the memory 902 can include a ROM, a RAM and a disk memory. The memory 902 is used to store the data required by the processor 901 during operation, that is, the instructions executable by the at least one processor 901 are stored, and the at least one processor 901 executes the method shown in Figures 2-7 by executing the instructions stored in the memory 902. Wherein, the number of the memory 902 is one or more. Wherein, the number of the memory 902 is one or more.

[0169] The embodiments of the present application also provide a computer storage medium, wherein the computer storage medium stores computer instructions, and when the computer instructions run on a computer, the computer executes the method as shown in Figures 2-7 .

[0170] The above only describes the preferred embodiments of the present application, and does not limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.​

Claims

1. A method for controlling valve opening, characterized in that, The method includes: Determine the real-time heat output of the battery pack; Based on the correspondence between the heat generation power of the battery pack, the temperature of the battery pack and the opening value of the target electronic expansion valve, the real-time heat generation power of the battery pack and the first opening value of the target electronic expansion valve corresponding to the real-time temperature are determined. The target electronic expansion valve is the electronic expansion valve in the battery cooling system. A first correction coefficient is determined based on the actual water immersion temperature and the target water immersion temperature of the battery pack. The first opening value is corrected based on the first correction coefficient to determine the second opening value of the target electronic expansion valve; Adjust the opening value of the target electronic expansion valve to the second opening value; The process of correcting the first opening value based on the first correction coefficient to determine the second opening value of the target electronic expansion valve includes: The first opening value is corrected based on the first correction coefficient to determine the third opening value of the target electronic expansion valve; The second correction factor is determined based on the actual evaporator temperature and the target evaporator temperature; The third opening value is corrected based on the second correction coefficient to determine the fourth opening value of the target electronic expansion valve; A third correction coefficient is determined based on the current vehicle speed and the water pump speed in the battery cooling system. The third correction coefficient is negatively correlated with the current vehicle speed and positively correlated with the water pump speed. The fourth opening value is corrected based on the third correction coefficient to determine the second opening value of the target electronic expansion valve; The fourth opening value is corrected based on the third correction coefficient to determine the second opening value of the target electronic expansion valve, including: The fourth opening value is corrected based on the third correction coefficient to determine the fifth opening value of the target electronic expansion valve; A fourth correction factor is determined based on the ambient temperature and the real-time temperature of the battery pack. The fifth opening value is corrected based on the fourth correction coefficient to determine the second opening value of the target electronic expansion valve.

2. The method according to claim 1, characterized in that, Before determining the real-time heating power and the first opening value of the target electronic expansion valve corresponding to the real-time temperature of the battery pack based on the correspondence between the battery pack's heating power, battery pack temperature, and the opening value of the target electronic expansion valve, the method further includes: The real-time heat generation power of the battery pack is filtered. Based on the correspondence between the battery pack's heat output, temperature, and the target electronic expansion valve's opening value, the real-time heat output and real-time temperature of the battery pack, and the corresponding first opening value of the target electronic expansion valve, are determined, including: Based on the correspondence between the battery pack's heating power, battery pack temperature, and the target electronic expansion valve's opening value, the real-time heating power of the battery pack after filtering and the first opening value of the target electronic expansion valve corresponding to the real-time temperature are determined.

3. The method according to claim 2, characterized in that, The filtering process is a low-pass filter.

4. A valve opening control device, characterized in that, The device includes: The power determination unit is used to determine the real-time heat generation power of the battery pack; An opening determination unit is used to determine the first opening value of the target electronic expansion valve corresponding to the real-time heat power and real-time temperature of the battery pack based on the correspondence between the heat power of the battery pack, the temperature of the battery pack and the opening value of the target electronic expansion valve. The target electronic expansion valve is an electronic expansion valve in the battery cooling system. The correction coefficient determination unit is used to determine a first correction coefficient based on the target water inlet temperature and the real-time water inlet temperature of the battery pack. The correction unit is used to correct the first opening value based on the first correction coefficient to determine the second opening value of the target electronic expansion valve. An adjustment unit is used to adjust the opening value of the target electronic expansion valve to the second opening value; The correction unit includes: The first correction unit corrects the first opening value based on the first correction coefficient to determine the third opening value of the target electronic expansion valve. The first determining unit is used to determine the second correction coefficient based on the actual evaporator temperature and the target evaporator temperature; The third correction unit corrects the third opening value based on the second correction coefficient to determine the fourth opening value of the target electronic expansion valve. The second determining unit is used to determine a third correction coefficient based on the current vehicle speed and the water pump speed in the battery cooling system. The third correction coefficient is negatively correlated with the current vehicle speed and positively correlated with the water pump speed. The fourth correction unit is used to correct the fourth opening value based on the third correction coefficient to determine the second opening value of the target electronic expansion valve. The fourth correction unit is specifically used for: The fourth opening value is corrected based on the third correction coefficient to determine the fifth opening value of the target electronic expansion valve; A fourth correction factor is determined based on the ambient temperature and the real-time temperature of the battery pack. The fifth opening value is corrected based on the fourth correction coefficient to determine the second opening value of the target electronic expansion valve.

5. An electronic device, characterized in that, The electronic device includes a memory for storing computer program instructions and a processor for executing the program instructions, wherein when the computer program instructions are executed by the processor, the electronic device is triggered to perform the steps of the method as described in any one of claims 1-3.

6. A computer-readable storage medium, characterized in that, The computer-readable storage medium is used to store computer instructions that, when executed in a computer, cause the computer to perform the steps of the method as described in any one of claims 1-3.

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