Control method of air conditioner and vehicle

Abstract

This application provides an air conditioning control method and a vehicle. The method, applied in the field of smart cockpits, includes: determining a first opening degree of a first electronic expansion valve based on a target temperature of the evaporator and the ambient temperature of the air conditioner; determining a second opening degree of the first electronic expansion valve based on the target temperature of the evaporator and the ambient temperature of the air conditioner, given that the air conditioner is in a target state; determining a target opening degree of the first electronic expansion valve based on the first and second opening degrees; and controlling the actual opening degree of the first electronic expansion valve to reach the target opening degree. This method can reduce temperature fluctuations in the evaporator, thereby reducing temperature fluctuations at the air conditioner outlet.

Description

Technical Field

[0001] This application relates to the field of smart cockpits, and more specifically, to a method for controlling an air conditioner and a vehicle within the field of smart cockpits. Background Technology

[0002] In high-temperature environments, when a plug-in hybrid electric vehicle is driving at high speed in pure electric mode, the vehicle's thermal management mode will switch from passenger compartment cooling (AC, Air Conditioning) to dual passenger compartment and battery cooling (ACBC, Air Conditioning and Battery Cooling).

[0003] After the mode switch is completed, the electronic expansion valve (EXV) of the battery cooler is in the open state, and some refrigerant is diverted to the battery cooler, which causes a change in the refrigerant flow into the evaporator of the passenger compartment, which in turn causes a change in the temperature of the evaporator, ultimately causing temperature fluctuations at the air conditioning outlet.

[0004] Therefore, after completing the mode switch, how to reduce the temperature fluctuation of the evaporator, and thus reduce the temperature fluctuation of the air conditioner outlet, has become an urgent problem to be solved. Summary of the Invention

[0005] This application provides an air conditioning control method and a vehicle, which can reduce the temperature fluctuation of the evaporator, thereby reducing the temperature fluctuation of the air conditioning outlet.

[0006] In a first aspect, a control method for an air conditioner is provided. The air conditioner includes an evaporator and a first electronic expansion valve corresponding to the evaporator. The method includes: determining a first opening degree of the first electronic expansion valve based on a target temperature of the evaporator and the ambient temperature of the air conditioner; wherein the first opening degree represents the opening degree required for the first electronic expansion valve when the air conditioner is not in a target state; determining a second opening degree of the first electronic expansion valve based on the target temperature of the evaporator and the ambient temperature of the air conditioner when the air conditioner is determined to be in a target state; wherein the target state represents the air conditioner being in a state of passenger compartment cooling and battery cooling; the second opening degree represents the opening degree required to compensate for the first opening degree when the air conditioner is in the target state; determining a target opening degree of the first electronic expansion valve based on the first opening degree and the second opening degree; and controlling the actual opening degree of the first electronic expansion valve to reach the target opening degree.

[0007] The above technical solution determines the first opening degree of the first electronic expansion valve based on the target temperature of the evaporator and the ambient temperature of the air conditioner. Then, when the air conditioner is in the target state, it further determines the second opening degree of the first electronic expansion valve based on the target temperature of the evaporator and the ambient temperature of the air conditioner. Based on the first and second opening degrees, a target opening degree of the first electronic expansion valve is determined. The actual opening degree of the first electronic expansion valve is then controlled to reach this target opening degree. This achieves tiered and compensatory control of the first electronic expansion valve under passenger cabin cooling and battery cooling conditions. Here, the target state represents the air conditioner being in passenger cabin cooling or battery cooling mode; the first opening degree represents the required opening degree of the first electronic expansion valve when the air conditioner is not in the target state; and the second opening degree represents the opening degree required to compensate for the first opening degree when the air conditioner is in the target state. Since the first opening provides the basic opening under non-target conditions, it can ensure the basic control requirements of the first electronic expansion valve under normal operating conditions; the second opening only compensates for the first opening under target conditions, and can correct for the situation where the refrigerant is diverted to the battery cooler and the refrigerant flow changes on the evaporator side when the passenger cabin cooling and battery cooling are carried out simultaneously. This reduces the evaporator temperature fluctuation and air conditioning outlet temperature fluctuation caused by insufficient evaporator refrigerant when the passenger cabin cooling and battery cooling are in operation.

[0008] In conjunction with the first aspect, in some possible implementations, determining the first opening degree of the first electronic expansion valve based on the target temperature of the evaporator and the ambient temperature of the air conditioner includes: determining the target superheat corresponding to the evaporator based on the target temperature and the ambient temperature; and determining the first opening degree of the first electronic expansion valve based on the target superheat corresponding to the evaporator.

[0009] The above technical solution first determines the target superheat of the evaporator based on the target temperature of the evaporator and the ambient temperature of the air conditioner. Then, it determines the first opening degree of the first electronic expansion valve based on this target superheat, allowing the first opening degree to be dynamically adjusted according to the target temperature of the evaporator and the ambient temperature. Since the target temperature of the evaporator reflects the required cooling level of the passenger compartment, and the ambient temperature reflects the heat dissipation requirements of the air conditioner, the target superheat degree determined by both can more accurately characterize the required superheat level of the evaporator under the current operating conditions. Determining the first opening degree based on this target superheat allows the first electronic expansion valve to provide a suitable refrigerant flow rate.

[0010] Combining the first aspect and the above implementation methods, in some possible implementation methods, determining the target superheat corresponding to the evaporator based on the target temperature and the ambient temperature includes: querying a first preset correspondence relationship based on the target temperature and the ambient temperature to determine the target superheat corresponding to the evaporator; wherein, the first preset correspondence relationship is used to describe the correspondence between the combination of the target temperature and the ambient temperature and the target superheat; in the first preset correspondence relationship, when the ambient temperature remains unchanged, the target temperature and the target superheat are positively correlated.

[0011] The above technical solution determines the target superheat of the evaporator by querying a first preset correspondence based on the target temperature and ambient temperature. This allows the target superheat to be quickly determined through a pre-calibrated correspondence, improving the efficiency of target superheat determination. The first preset correspondence describes the relationship between the combination of target temperature and ambient temperature and the target superheat. In this first preset correspondence, when the ambient temperature remains constant, the target temperature and the target superheat are positively correlated. That is, when the target temperature is high, it indicates that the cooling demand of the air conditioner is low. By setting a larger target superheat, the refrigerant flow into the evaporator can be reduced, avoiding overcooling. When the target temperature is low, it indicates that the cooling demand of the air conditioner is high. By setting a smaller target superheat, the refrigerant flow into the evaporator can be increased, ensuring sufficient heat exchange in the evaporator.

[0012] Combining the first aspect and the above implementation methods, in some possible implementation methods, determining the second opening degree of the first electronic expansion valve based on the target temperature of the evaporator and the ambient temperature of the air conditioner includes: querying a second preset correspondence relationship based on the target temperature and the ambient temperature to determine the second opening degree of the first electronic expansion valve; wherein, the second preset correspondence relationship is used to describe the correspondence between the combination of the target temperature and the ambient temperature and the second opening degree; in the second preset correspondence relationship, when the target temperature is greater than or equal to a preset temperature threshold, the target temperature and the second opening degree are negatively correlated when the ambient temperature remains unchanged; when the target temperature is less than the preset temperature threshold, the second opening degree is 0; when the target temperature is greater than or equal to the preset temperature threshold, the ambient temperature and the second opening degree are positively correlated when the target temperature remains unchanged.

[0013] The above technical solution determines the second opening degree of the first electronic expansion valve by querying a second preset correspondence based on the target temperature of the evaporator and the ambient temperature of the air conditioner. This allows for a compensatory opening degree for the first electronic expansion valve when the air conditioner is in a target state where passenger cabin cooling and battery cooling are performed simultaneously. Since the second preset correspondence describes the relationship between the combination of the target temperature and the ambient temperature and the second opening degree, the second opening degree can more accurately reflect the compensation requirement for the opening degree of the first electronic expansion valve under the current operating conditions. Furthermore, in the second preset correspondence, when the target temperature is greater than or equal to the preset temperature threshold, under the condition that the ambient temperature remains unchanged, the target temperature and the second opening degree are negatively correlated. That is to say, the higher the target temperature, the weaker the cooling demand of the air conditioner, and the smaller the refrigerant flow required by the evaporator. At this time, the second opening degree is reduced accordingly, which can avoid excessive compensation for the first opening degree, resulting in too much refrigerant entering the evaporator. On the other hand, the lower the target temperature, the stronger the cooling demand of the air conditioner, and the more sufficient the refrigerant flow is required by the evaporator to maintain the cooling capacity. At this time, the second opening degree is increased accordingly, which can compensate for the refrigerant flow on the evaporator side while the battery cooling diverts part of the refrigerant, preventing insufficient liquid supply and temperature rise of the evaporator. When the target temperature is greater than or equal to the preset temperature threshold, the ambient temperature and the second opening degree are positively correlated, assuming the target temperature remains constant. In other words, the higher the ambient temperature, the greater the compensation opening degree is needed to increase the refrigerant flow on the evaporator side in order to maintain the heat exchange capacity of the evaporator and thus ensure the cooling effect of the air conditioner. When the ambient temperature is low, the heat load is small, and the second opening degree is reduced accordingly to avoid over-cooling and energy waste. When the target temperature is less than the preset temperature threshold, the second opening degree is 0, that is, no compensation is performed to avoid the compressor from shutting down due to the evaporator temperature being too low.

[0014] In combination with the first aspect and the above implementation methods, in some possible implementation methods, when it is determined that the air conditioner is in the target state, the method further includes: determining the compensation air volume corresponding to the air conditioner based on the ambient temperature where the air conditioner is located; determining the target air volume corresponding to the air conditioner based on the actual air volume and the compensation air volume; and controlling the air conditioner to output according to the target air volume.

[0015] The above technical solution, by determining the corresponding compensating air volume of the air conditioner based on the ambient temperature when the air conditioner is in a target state, and determining the corresponding target air volume based on the actual air volume and the compensating air volume, and then controlling the air conditioner to output according to the target air volume, achieves dynamic correction of the air conditioner's air volume when passenger cabin cooling and battery cooling are carried out simultaneously. Since the target state indicates that the air conditioner is simultaneously cooling the passenger cabin and the battery, the refrigerant needs to be distributed between the passenger cabin evaporator and the battery cooler. The refrigerant flow rate entering the evaporator is prone to change, and the evaporator temperature is prone to fluctuation. The ambient temperature can reflect the heat dissipation demand of the air conditioner. Therefore, determining the compensating air volume based on the ambient temperature allows the air volume correction to change dynamically with the heat dissipation demand. Combining the compensating air volume with the actual air volume to obtain the target air volume can reduce the temperature rise or fluctuation of the evaporator due to the refrigerant being diverted to the battery cooler, thereby stabilizing the evaporator temperature and the air conditioner's outlet air temperature.

[0016] Combining the first aspect and the above implementation methods, in some possible implementation methods, the compensation air volume corresponding to the air conditioner is determined based on the ambient temperature, including: based on the ambient temperature, querying a third preset correspondence relationship to determine the compensation air volume; wherein, the third preset correspondence relationship is used for the correspondence between ambient temperature and compensation air volume; in the third preset correspondence relationship, ambient temperature and compensation air volume are positively correlated.

[0017] The above technical solution determines the corresponding compensation air volume of the air conditioner by querying a third preset correspondence based on the ambient temperature. This allows the compensation air volume to be quickly obtained through the pre-defined correspondence, thereby improving the efficiency of determining the compensation air volume. Furthermore, the third preset correspondence describes the relationship between ambient temperature and compensation air volume, and in this relationship, ambient temperature and compensation air volume are positively correlated; that is, the higher the ambient temperature, the larger the determined compensation air volume; and the lower the ambient temperature, the smaller the determined compensation air volume.

[0018] In conjunction with the first aspect and the above implementation methods, in some possible implementation methods, the air conditioner also includes a battery cooler and a second electronic expansion valve corresponding to the battery cooler; before determining the second opening degree of the first electronic expansion valve based on the target temperature of the evaporator and the ambient temperature where the air conditioner is located, when it is determined that the air conditioner is in the target state, the method further includes: acquiring related parameters of the air conditioner; wherein, the related parameters include the ambient temperature where the air conditioner is located, the actual temperature of the battery associated with the air conditioner, and the actual opening degree of the second electronic expansion valve; if the ambient temperature is greater than a preset ambient temperature threshold, the actual temperature is greater than a preset battery temperature threshold, and the actual opening degree of the second electronic expansion valve reaches a preset opening degree threshold, then it is determined that the air conditioner is in the target state.

[0019] The above technical solution, before determining that the air conditioner is in the target state, first obtains the associated parameters related to the air conditioner, including the ambient temperature where the air conditioner is located, the actual temperature of the battery associated with the air conditioner, and the actual opening degree of the second electronic expansion valve. The air conditioner is only determined to be in the target state when the ambient temperature is greater than a preset ambient temperature threshold, the actual battery temperature is greater than a preset battery temperature threshold, and the actual opening degree of the second electronic expansion valve reaches a preset opening threshold. This achieves accurate identification of the simultaneous operation of passenger cabin cooling and battery cooling.

[0020] In combination with the first aspect and the above implementation methods, in some possible implementation methods, the method further includes: if it is determined that the air conditioner is not in the target state if the associated parameters related to the air conditioner meet any of the following conditions: the duration of the actual opening degree reaching the preset opening degree threshold is greater than the preset duration threshold; the actual superheat of the battery cooler is less than the preset superheat threshold; the outlet temperature of the battery associated with the air conditioner is less than the preset outlet temperature threshold.

[0021] The above technical solution, by setting exit conditions for the target state, determines that the air conditioner is not in the target state when any of the following conditions are met: the actual opening degree of the second electronic expansion valve reaches a preset opening degree threshold for a duration longer than a preset duration threshold; the actual superheat of the battery cooler is less than a preset superheat threshold; or the battery outlet temperature is less than a preset outlet temperature threshold. This achieves dynamic exit control of the target state.

[0022] In combination with the first aspect and the above implementation methods, in some possible implementation methods, the method further includes: if it is determined that the air conditioner is not in the target state, then based on the target temperature of the evaporator and the ambient temperature where the air conditioner is located, determining the target superheat corresponding to the evaporator; based on the target superheat, determining the first opening degree of the first electronic expansion valve; and controlling the actual opening degree of the first electronic expansion valve to reach the first opening degree.

[0023] The above technical solution achieves basic refrigeration control in non-target states by determining the target superheat of the evaporator based solely on the target temperature of the evaporator and the ambient temperature of the air conditioner when the air conditioner is not in the target state, determining the first opening degree of the first electronic expansion valve based on the target superheat degree, and then controlling the actual opening degree of the first electronic expansion valve to reach the first opening degree.

[0024] Secondly, a control device for an air conditioner is provided. The air conditioner includes an evaporator and a first electronic expansion valve corresponding to the evaporator. The device includes: a first determining module, used to determine a first opening degree of the first electronic expansion valve based on a target temperature of the evaporator and the ambient temperature of the air conditioner; wherein the first opening degree represents the opening degree required for the first electronic expansion valve when the air conditioner is not in a target state; a second determining module, used to determine a second opening degree of the first electronic expansion valve based on the target temperature of the evaporator and the ambient temperature of the air conditioner when the air conditioner is determined to be in a target state; wherein the target state represents the air conditioner being in a state of passenger compartment cooling and battery cooling; the second opening degree represents the opening degree required to compensate for the first opening degree when the air conditioner is in the target state; a third determining module, used to determine a target opening degree of the first electronic expansion valve based on the first opening degree and the second opening degree; and a control module, used to control the actual opening degree of the first electronic expansion valve to reach the target opening degree.

[0025] In conjunction with the second aspect, in some implementations of the second aspect, the first determining module is specifically used to: determine the target superheat corresponding to the evaporator based on the target temperature and the ambient temperature; and determine the first opening degree of the first electronic expansion valve based on the target superheat corresponding to the evaporator.

[0026] In conjunction with the second aspect and the above implementation methods, in some implementation methods of the second aspect, the first determining module is specifically used to: query a first preset correspondence based on the target temperature and the ambient temperature to determine the target superheat corresponding to the evaporator; wherein, the first preset correspondence is used to describe the correspondence between the combination of the target temperature and the ambient temperature and the target superheat; in the first preset correspondence, when the ambient temperature remains unchanged, the target temperature and the target superheat are positively correlated.

[0027] In conjunction with the second aspect and the above implementation methods, in some implementation methods of the second aspect, the second determining module is specifically used to: query a second preset correspondence based on the target temperature and the ambient temperature to determine the second opening degree of the first electronic expansion valve; wherein, the second preset correspondence is used to describe the correspondence between the combination of the target temperature and the ambient temperature and the second opening degree; in the second preset correspondence, when the target temperature is greater than or equal to a preset temperature threshold, the target temperature and the second opening degree are negatively correlated when the ambient temperature remains unchanged; when the target temperature is less than the preset temperature threshold, the second opening degree is 0; when the target temperature is greater than or equal to the preset temperature threshold, the ambient temperature and the second opening degree are positively correlated when the target temperature remains unchanged.

[0028] In conjunction with the second aspect and the above implementation methods, in some implementation methods of the second aspect, the device further includes a fourth determining module, which is specifically used for: determining the compensation air volume corresponding to the air conditioner based on the ambient temperature where the air conditioner is located; determining the target air volume corresponding to the air conditioner based on the actual air volume and the compensation air volume corresponding to the air conditioner; and controlling the air conditioner to output according to the target air volume.

[0029] Combining the second aspect and the above implementation methods, in some implementation methods of the second aspect, the fourth determining module is specifically used to: query the third preset correspondence based on the ambient temperature to determine the compensation air volume; wherein, the third preset correspondence is used to determine the correspondence between the ambient temperature and the compensation air volume; in the third preset correspondence, the ambient temperature and the compensation air volume are positively correlated.

[0030] In conjunction with the second aspect and the above-described implementation methods, in some implementation methods of the second aspect, the air conditioner further includes a battery cooler and a second electronic expansion valve corresponding to the battery cooler; the device further includes a fifth determining module, which is specifically used to: acquire associated parameters related to the air conditioner; wherein, the associated parameters include the ambient temperature where the air conditioner is located, the actual temperature of the battery associated with the air conditioner, and the actual opening degree of the second electronic expansion valve; if the ambient temperature is greater than a preset ambient temperature threshold, the actual temperature is greater than a preset battery temperature threshold, and the actual opening degree of the second electronic expansion valve reaches a preset opening degree threshold, then it is determined that the air conditioner is in the target state.

[0031] In conjunction with the second aspect and the above implementation methods, in some implementation methods of the second aspect, the device further includes a sixth determining module, which is specifically used to: determine that the air conditioner is not in the target state if the associated parameters related to the air conditioner meet any of the following conditions: the duration for which the actual opening degree reaches the preset opening degree threshold is greater than the preset duration threshold; the actual superheat of the battery cooler is less than the preset superheat threshold; the outlet temperature of the battery associated with the air conditioner is less than the preset outlet temperature threshold.

[0032] In conjunction with the second aspect and the above implementation methods, in some implementation methods of the second aspect, the device further includes a seventh determining module, which is specifically used for: if it is determined that the air conditioner is not in the target state, determining the target superheat corresponding to the evaporator based on the target temperature of the evaporator and the ambient temperature where the air conditioner is located; determining the first opening degree of the first electronic expansion valve based on the target superheat; and controlling the actual opening degree of the first electronic expansion valve to reach the first opening degree.

[0033] Thirdly, a vehicle is provided, including a memory and a processor. The memory is used to store executable program code, and the processor is used to call and run the executable program code from the memory, causing the vehicle to perform the methods of the first aspect or any possible implementation thereof.

[0034] Fourthly, a computer program product is provided, comprising: computer program code, which, when run on a computer, causes the computer to perform the methods described in the first aspect or any possible implementation thereof.

[0035] Fifthly, a computer-readable storage medium is provided that stores computer program code, which, when executed on a computer, causes the computer to perform the methods described in the first aspect or any possible implementation thereof. Attached Figure Description

[0036] Figure 1 This is a schematic flowchart of an air conditioner control method provided in an embodiment of this application.

[0037] Figure 2 This is a schematic flowchart of another air conditioner control method provided in the embodiments of this application.

[0038] Figure 3 This is a schematic diagram of the structure of an air conditioner control device provided in an embodiment of this application.

[0039] Figure 4 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this application. Detailed Implementation

[0040] The technical solutions in this application will be clearly and thoroughly described below with reference to the accompanying drawings. In the description of the embodiments of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. "And / or" in the text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more than two.

[0041] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0042] In high-temperature environments, when a plug-in hybrid electric vehicle is driving at high speed in pure electric mode, the vehicle's thermal management mode will switch from passenger compartment cooling (AC, Air Conditioning) to dual passenger compartment and battery cooling (ACBC, Air Conditioning and Battery Cooling).

[0043] After the mode switch is completed, the electronic expansion valve (EXV) of the battery cooler is in the open state, and some refrigerant is diverted to the battery cooler, which causes a change in the refrigerant flow into the evaporator of the passenger compartment, which in turn causes a change in the temperature of the evaporator, ultimately causing temperature fluctuations at the air conditioning outlet.

[0044] Therefore, after completing the mode switch, how to avoid temperature fluctuations in the evaporator, and thus avoid temperature fluctuations in the air conditioner outlet, has become an urgent problem to be solved.

[0045] To at least address the aforementioned issues, this application provides an air conditioning control method applied to an air conditioning controller. This method can reduce temperature fluctuations in the evaporator, thereby reducing temperature fluctuations at the air conditioning outlet.

[0046] Figure 1 This is a schematic flowchart of an air conditioner control method provided in an embodiment of this application.

[0047] For example, such as Figure 1 As shown, the method 100 includes: Step 101: Based on the target temperature of the evaporator and the ambient temperature of the air conditioner, determine the first opening degree of the first electronic expansion valve; wherein, the first opening degree is used to represent the opening degree that the first electronic expansion valve needs to reach when the air conditioner is not in the target state.

[0048] Step 102: When it is determined that the air conditioner is in the target state, the second opening degree of the first electronic expansion valve is determined based on the target temperature of the evaporator and the ambient temperature of the air conditioner; wherein, the target state is used to indicate that the air conditioner is in the state of passenger cabin cooling and battery cooling; the second opening degree is used to indicate the opening degree required to compensate the first opening degree when the air conditioner is in the target state.

[0049] Step 103: Determine the target opening of the first electronic expansion valve based on the first opening and the second opening.

[0050] Step 104: Control the actual opening degree of the first electronic expansion valve to reach the target opening degree.

[0051] In this embodiment, a first opening degree of the first electronic expansion valve is determined based on the target temperature of the evaporator and the ambient temperature of the air conditioner. Then, when the air conditioner is in a target state, a second opening degree of the first electronic expansion valve is further determined based on the target temperature of the evaporator and the ambient temperature of the air conditioner. A target opening degree of the first electronic expansion valve is determined based on the first and second opening degrees. The actual opening degree of the first electronic expansion valve is then controlled to reach this target opening degree, thereby achieving tiered and compensatory control of the first electronic expansion valve under passenger cabin cooling and battery cooling conditions. Here, the target state represents the air conditioner being in passenger cabin cooling and battery cooling states; the first opening degree represents the opening degree required for the first electronic expansion valve to reach when the air conditioner is not in the target state; and the second opening degree represents the opening degree required to compensate for the first opening degree when the air conditioner is in the target state. Since the first opening provides the basic opening under non-target conditions, it can ensure the basic control requirements of the first electronic expansion valve under normal operating conditions; the second opening only compensates for the first opening under target conditions, and can correct for the situation where the refrigerant is diverted to the battery cooler and the refrigerant flow changes on the evaporator side when the passenger cabin cooling and battery cooling are carried out simultaneously. This reduces the evaporator temperature fluctuation and air conditioning outlet temperature fluctuation caused by insufficient evaporator refrigerant when the passenger cabin cooling and battery cooling are in operation.

[0052] The following is about Figure 1 The implementation of each step in the illustrated embodiment will be explained in detail.

[0053] Regarding step 101, it is understood that in this embodiment, the aforementioned air conditioner can refer to a vehicle-mounted air conditioner. This air conditioner includes an evaporator, a battery cooler, a first electronic expansion valve corresponding to the evaporator, and a second electronic expansion valve corresponding to the battery cooler. The first electronic expansion valve is used to regulate the refrigerant flow rate into the evaporator, and the second electronic expansion valve is used to regulate the refrigerant flow rate into the battery cooler.

[0054] The target temperature of the evaporator can be determined based on the cooling degree of the evaporator. The stronger the cooling degree of the evaporator, the higher the cooling demand of the passenger compartment, and therefore the lower the target temperature of the evaporator. The weaker the cooling degree of the evaporator, the lower the cooling demand of the passenger compartment, and therefore the higher the target temperature of the evaporator.

[0055] The cooling capacity of the evaporator can be understood as the energy requirement parameter needed to cool the passenger compartment. In this application, the air conditioning system can be understood as a vehicle-mounted air conditioner. This energy requirement parameter can be determined comprehensively based on the vehicle interior temperature, the exterior ambient temperature (i.e., outside temperature), ambient light intensity, and the set temperature of the vehicle-mounted air conditioner. The larger this energy requirement parameter, the stronger the cooling capacity of the evaporator and the lower the target temperature of the evaporator; conversely, the smaller the energy requirement parameter, the weaker the cooling capacity of the evaporator and the higher the target temperature of the evaporator.

[0056] Specifically, based on the energy demand parameters required for cooling the occupant cabin, the fourth preset correspondence is queried to determine the target temperature of the evaporator; wherein, the aforementioned fourth preset correspondence is used to describe the correspondence between the energy demand parameters and the target temperature of the evaporator; in the fourth preset correspondence, when the energy demand parameters are greater than or equal to the first preset energy demand parameter threshold, the energy demand parameters are negatively correlated with the target temperature.

[0057] In the aforementioned fourth preset correspondence, when the energy demand parameter is greater than or equal to the first preset energy demand parameter threshold, the target temperature gradually decreases as the energy demand parameter increases.

[0058] The aforementioned fourth preset correspondence can be represented by a fourth preset correspondence table, which can be pre-defined. The aforementioned fourth preset correspondence table can be shown in Table 1 below.

[0059]

[0060] Table 1 The data in the aforementioned fourth preset correspondence table are merely illustrative examples for ease of understanding and do not represent actual data. For instance, T1 refers to the target temperature T in column 1, i.e., the target temperature T1 when the energy demand parameter is Q1. This application embodiment does not limit the specific value of the target temperature T.

[0061] In Table 1 above, Q1, Q2, Q3, and Q4 are all greater than or equal to the first preset energy demand parameter threshold, and Q1>Q2>Q3>Q4. The energy demand parameters are negatively correlated with the target temperature. For example, as the energy demand parameters Q4, Q3, Q2, and Q1 gradually increase, the target temperatures T4, T3, T2, and T1 gradually decrease, i.e., T1... <T2<T3<T4。

[0062] However, when the energy demand parameter is less than the first preset energy demand parameter threshold, as the energy demand parameter gradually decreases, it indicates that the cooling demand of the passenger cabin gradually decreases until there is no cooling demand in the passenger cabin. At this point, the target temperature can be directly set to the maximum temperature value. That is, in Table 1 above, Q5 and Q6 are both less than the first preset energy demand parameter threshold; therefore, T5 and T6 are both maximum temperature values.

[0063] The aforementioned first preset energy demand parameter threshold can be pre-calibrated; optionally, the first preset energy demand parameter threshold can be pre-calibrated to 0.

[0064] Based on the understanding of "air conditioner" in this application as "vehicle air conditioner", the ambient temperature of the air conditioner can be understood as the outside ambient temperature of the vehicle, which can be obtained by the outside ambient temperature sensor.

[0065] Given the target temperature of the evaporator and the ambient temperature of the air conditioner, the first opening degree of the first electronic expansion valve is determined. This first opening degree indicates the required opening degree of the first electronic expansion valve when the air conditioner is not in the target state.

[0066] The following section will explain in detail how to determine the first opening degree of the first electronic expansion valve based on the target temperature of the evaporator and the ambient temperature of the air conditioner.

[0067] In some embodiments, determining the first opening degree of the first electronic expansion valve based on the target temperature of the evaporator and the ambient temperature of the air conditioner includes: determining the target superheat corresponding to the evaporator based on the target temperature and the ambient temperature; and determining the first opening degree of the first electronic expansion valve based on the target superheat corresponding to the evaporator.

[0068] Understandably, given the target temperature of the evaporator and the ambient temperature of the air conditioner, the target superheat of the evaporator is determined based on the target temperature of the evaporator and the ambient temperature of the air conditioner, and then the first opening degree of the first electronic expansion valve is determined based on the target superheat of the evaporator.

[0069] The superheat of the evaporator can be understood as the difference between the evaporator outlet temperature and the saturation temperature corresponding to the current evaporation pressure. Based on this, setting a target superheat for the evaporator is equivalent to setting a target outlet temperature for the evaporator. Therefore, if the evaporator outlet temperature is to reach the target outlet temperature, the opening of the first electronic expansion valve needs to be adjusted so that when the refrigerant flows to the evaporator outlet, the superheat of the evaporator reaches the target superheat.

[0070] In some embodiments, determining the target superheat of the evaporator based on the target temperature and the ambient temperature includes: querying a first preset correspondence relationship based on the target temperature and the ambient temperature to determine the target superheat of the evaporator; wherein, the first preset correspondence relationship is used to describe the correspondence between the combination of the target temperature and the ambient temperature and the target superheat; in the first preset correspondence relationship, when the ambient temperature remains unchanged, the target temperature and the target superheat are positively correlated.

[0071] It is understandable that the above-mentioned first preset correspondence is used to describe the correspondence between the combination of target temperature and ambient temperature and target superheat. Based on the combination of target temperature and ambient temperature, by querying the above-mentioned first preset correspondence, the target superheat corresponding to the evaporator can be obtained.

[0072] In the first preset correspondence mentioned above, when the ambient temperature remains constant, the target superheat gradually increases as the target temperature increases; when the target temperature remains constant, the target superheat remains constant or increases slightly as the ambient temperature increases.

[0073] In some embodiments, the first preset correspondence can be represented by a first preset correspondence table, which can be pre-defined. The first preset correspondence table can be as shown in Table 2 below.

[0074] Table 2

[0075] The data in the aforementioned first preset correspondence table are merely illustrative examples for ease of understanding and do not represent actual data. For instance, S11 refers to the target superheat S in the first row and first column of table 2, i.e., the target superheat S11 when the target temperature is T1 and the ambient temperature is O1. S44 refers to the target superheat S in the fourth row and fourth column of table 2, i.e., the target superheat S44 when the target temperature is T4 and the ambient temperature is O4. This application embodiment does not limit the specific value of the target superheat S.

[0076] In Table 2 above, when the ambient temperature remains constant, the target temperature and the target superheat are positively correlated. For example, when the ambient temperature is O1, the target superheat gradually increases with the increase of the target temperature, that is, it gradually increases from S11 to S41. When the target temperature remains constant, the target superheat remains constant or increases slightly with the increase of the ambient temperature. For example, when the target temperature is T1, it remains constant or increases slightly from S11 to S14.

[0077] After obtaining the target superheat by querying the first preset correspondence, the superheat difference is calculated based on the actual superheat of the evaporator and the target superheat of the evaporator. This superheat difference is then subjected to PI control to obtain the first opening degree of the first electronic expansion valve, as shown in the following formula:

[0078] in, This refers to the first opening degree of the first electronic expansion valve, typically measured in "steps". The initial opening of the first electronic expansion valve is usually determined based on the actual temperature of the power battery, the ambient temperature of the air conditioner, and the actual speed of the compressor. For proportional gain; For integral gain; The superheat difference is calculated by subtracting the target superheat of the evaporator from the actual superheat of the evaporator.

[0079] It is evident that, under constant ambient temperature, as the target temperature increases, the cooling demand of the passenger compartment gradually decreases. If the target superheat gradually increases, the superheat difference gradually decreases, and thus the first opening of the first electronic expansion valve also gradually decreases, thereby reducing the refrigerant flow in the evaporator. Consequently, the actual temperature of the evaporator gradually increases, so that the actual temperature of the evaporator reaches the target temperature of the evaporator, thereby meeting the gradually decreasing cooling demand of the passenger compartment.

[0080] For step 102, it can be understood that the air conditioner being in the target state refers to the air conditioner being in the state of cooling the passenger cabin and cooling the battery.

[0081] The aforementioned passenger cabin cooling refers to an operating mode aimed at regulating the thermal comfort of the passenger cabin. This mode involves controlling the refrigerant to enter the evaporator in the passenger cabin, where it evaporates and absorbs heat, cooling the air flowing through the evaporator, and then sending the cooled air into the passenger cabin to bring the passenger cabin temperature close to or to the set temperature.

[0082] The aforementioned battery cooling refers to an operating mode in which the refrigerant is controlled to enter the battery cooler to regulate the temperature of the power battery. The refrigerant evaporates and absorbs heat in the battery cooler, cooling the battery coolant. The coolant then flows through the battery pack cold plate or cooling channel to exchange heat with the battery cells, thereby controlling the temperature of the power battery within a certain range.

[0083] In practical applications, the following methods can be used to determine whether the air conditioner is in the target state.

[0084] In some embodiments, before determining the first opening degree of the first electronic expansion valve based on the target temperature of the evaporator and the ambient temperature where the air conditioner is located, when it is determined that the air conditioner is in a target state, the method further includes: acquiring associated parameters related to the air conditioner; wherein, the associated parameters include the ambient temperature where the air conditioner is located, the actual temperature of the battery associated with the air conditioner, and the actual opening degree of the second electronic expansion valve; if the ambient temperature is greater than a preset ambient temperature threshold, the actual temperature is greater than a preset battery temperature threshold, and the actual opening degree of the second electronic expansion valve reaches a preset opening degree threshold, then it is determined that the air conditioner is in a target state.

[0085] It is understandable that the aforementioned preset ambient temperature threshold is used to determine whether the ambient temperature of the air conditioner is too high. The preset ambient temperature threshold can be pre-calibrated, and optionally, the preset ambient temperature threshold can be pre-calibrated to 35℃.

[0086] The aforementioned preset battery temperature threshold is used to determine whether the actual temperature of the battery associated with the air conditioner is too high. The preset battery temperature threshold can be pre-calibrated, and optionally, the preset battery temperature threshold can be pre-calibrated to 42°C.

[0087] The aforementioned preset opening threshold is used to determine whether the actual opening of the second electronic expansion valve has reached the minimum opening. The preset opening threshold can be pre-calibrated, and optionally, the preset opening threshold can be pre-calibrated to 70 steps.

[0088] If the ambient temperature where the air conditioner is located is determined to be greater than the preset ambient temperature threshold, it means that the ambient temperature where the air conditioner is located is relatively high. In order to ensure the heat dissipation needs of the passenger cabin, it is necessary to ensure that the air conditioner is in the target state. By compensating the first opening of the first electronic expansion valve with the second opening of the first electronic expansion valve, the actual opening of the first electronic expansion valve is increased, so as to reduce the temperature fluctuation of the evaporator and thus ensure that the air conditioner can dissipate heat normally.

[0089] If the actual temperature of the battery associated with the air conditioner is determined to be greater than the preset battery temperature threshold, it indicates that the actual temperature of the battery is relatively high. In order to ensure the heat dissipation needs of both the battery and the passenger compartment, it is necessary to ensure that the air conditioner is in both passenger compartment cooling and battery cooling states. Therefore, it can be determined that the air conditioner is in the target state. At the same time, by compensating the first opening of the first electronic expansion valve with the second opening of the first electronic expansion valve, the actual opening of the first electronic expansion valve is increased to reduce the temperature fluctuation of the evaporator, thereby ensuring that the passenger compartment can dissipate heat normally.

[0090] If the actual opening degree of the second electronic expansion valve reaches the preset opening degree threshold, it means that the actual opening degree of the second electronic expansion valve has reached the minimum opening degree. In order to ensure the heat dissipation effect of the battery, it is necessary to ensure that the air conditioner is in the battery cooling state, and at the same time, it is determined that the air conditioner is in the passenger cabin cooling state to ensure the heat dissipation effect of the passenger cabin. Therefore, it can be determined that the air conditioner is in the target state.

[0091] If all the above conditions are met, it indicates that there is a significant heat dissipation requirement in the passenger cabin, and therefore the air conditioning can be determined to be in the target state.

[0092] The following section will explain in detail how to determine the second opening degree of the first electronic expansion valve based on the target temperature of the evaporator and the ambient temperature of the air conditioner.

[0093] In some embodiments, determining the second opening degree of the first electronic expansion valve based on the target temperature of the evaporator and the ambient temperature of the air conditioner includes: querying a second preset correspondence relationship based on the target temperature and the ambient temperature to determine the second opening degree of the first electronic expansion valve; wherein, the second preset correspondence relationship describes the correspondence between the combination of the target temperature and the ambient temperature and the second opening degree; in the second preset correspondence relationship, when the target temperature is greater than or equal to a preset temperature threshold, the target temperature and the second opening degree are negatively correlated when the ambient temperature remains unchanged; when the target temperature is less than the preset temperature threshold, the second opening degree is 0; when the target temperature is greater than or equal to the preset temperature threshold, the ambient temperature and the second opening degree are positively correlated when the target temperature remains unchanged.

[0094] It is understandable that the second opening degree mentioned above is used to indicate the opening degree required to compensate for the first opening degree when the air conditioner is in the target state.

[0095] The aforementioned second preset correspondence is used to describe the correspondence between the combination of target temperature and ambient temperature and the second opening degree. By querying the aforementioned second preset correspondence based on the combination of target temperature and ambient temperature, the second opening degree of the first electronic expansion valve can be obtained.

[0096] In the second preset correspondence, when the target temperature is greater than or equal to the preset temperature threshold, the target temperature is negatively correlated with the second opening degree when the ambient temperature remains unchanged; when the target temperature is less than the preset temperature threshold, the second opening degree is 0; when the target temperature remains unchanged, the ambient temperature is positively correlated with the second opening degree.

[0097] In some embodiments, the second preset correspondence can be represented by a second preset correspondence table, which can be pre-defined. The second preset correspondence table can be as shown in Table 3 below.

[0098] Table 3

[0099] The data in the aforementioned second preset correspondence table are merely illustrative examples for ease of understanding and do not represent actual data. For instance, E21 refers to the second opening degree E in the second row and first column of table 3, i.e., the second opening degree E21 when the target temperature is T1' and the ambient temperature is O1'. E44 refers to the second opening degree E in the fourth row and fourth column of table 3, i.e., the second opening degree E44 when the target temperature is T4' and the ambient temperature is O4'. This application embodiment does not limit the specific value of the second opening degree E.

[0100] In Table 3 above, when the target temperature is greater than or equal to the preset temperature threshold (which can be understood as any value between T1` and T2`), the target temperature and the second opening degree are negatively correlated when the ambient temperature remains unchanged. For example, when the ambient temperature is O1`, the second opening degree E gradually decreases as the target temperature increases, that is, it gradually decreases from E21 to E41. When the target temperature is less than the preset temperature threshold, the second opening degree is 0. For example, when the ambient temperature is O1` and the target temperature is less than the preset temperature threshold (that is, the target temperature is T1`), the second opening degree is 0.

[0101] When the target temperature is greater than or equal to the preset temperature threshold, the ambient temperature is positively correlated with the second opening degree while the target temperature remains unchanged. For example, when the target temperature is T2', the second opening degree E gradually increases as the ambient temperature increases, that is, it gradually increases from E21 to E24.

[0102] It can be seen that when the target temperature is greater than or equal to the preset temperature threshold, under the condition that the ambient temperature remains unchanged, as the target temperature increases, the cooling demand of the passenger cabin gradually decreases. If the second opening gradually decreases, the refrigerant flow in the evaporator can be reduced, thereby causing the actual temperature of the evaporator to gradually increase, so that the actual temperature of the evaporator reaches the target temperature of the evaporator. With the ambient temperature remaining constant, as the target temperature decreases, it indicates that the cooling demand of the passenger cabin is gradually increasing. If the second opening degree is gradually increased, the refrigerant flow in the evaporator can be increased so that the actual temperature of the evaporator reaches the target temperature of the evaporator. However, the target temperature of the evaporator cannot decrease indefinitely. If the target temperature of the evaporator is too low, it will cause the compressor to stop. Therefore, when the target temperature is less than the preset temperature threshold, the second opening degree is directly set to 0 to prevent the opening degree of the first electronic expansion valve from opening indefinitely.

[0103] When the target temperature is greater than or equal to the preset temperature threshold, with the target temperature remaining constant, the increase in ambient temperature indicates that the heat dissipation demand of the passenger compartment is gradually increasing. Therefore, it is necessary to increase the cooling demand of the passenger compartment. If the second opening degree is gradually increased, the refrigerant flow in the evaporator can be increased, thereby increasing the cooling demand of the passenger compartment.

[0104] For step 103, it can be understood that, having obtained the first opening degree and the second opening degree respectively, adding the first opening degree and the second opening degree will yield the target opening degree of the first electronic expansion valve, as shown in the following formula:

[0105] in, The target opening degree of the first electronic expansion valve. This represents the first opening degree of the first electronic expansion valve. This is the second opening degree of the first electronic expansion valve.

[0106] For step 104, it can be understood that once the target opening degree of the first electronic expansion valve is obtained, the actual opening degree of the first electronic expansion valve can be controlled to reach the target opening degree.

[0107] In addition, to further avoid temperature fluctuations in the evaporator, the airflow of the evaporator can be limited.

[0108] In some embodiments, when it is determined that the air conditioner is in a target state, the method further includes: determining the compensation air volume corresponding to the air conditioner based on the ambient temperature where the air conditioner is located; determining the target air volume corresponding to the air conditioner based on the actual air volume and the compensation air volume; and controlling the air conditioner to output according to the target air volume.

[0109] Understandably, given that the air conditioner is in the target state, the corresponding compensation air volume can be determined based on the ambient temperature where the air conditioner is located.

[0110] The following section will explain in detail how to determine the corresponding compensation air volume for the air conditioner based on the ambient temperature.

[0111] In some embodiments, determining the compensation air volume corresponding to the air conditioner based on the ambient temperature includes: querying a third preset correspondence relationship based on the ambient temperature to determine the compensation air volume; wherein, the third preset correspondence relationship is used to determine the correspondence between the ambient temperature and the compensation air volume; in the third preset correspondence relationship, the ambient temperature and the compensation air volume are positively correlated.

[0112] It is understandable that the above-mentioned third preset correspondence is used to determine the correspondence between ambient temperature and compensation air volume. By querying the above-mentioned third preset correspondence based on the ambient temperature, the compensation air volume corresponding to the air conditioner can be obtained.

[0113] In the third preset correspondence, as the ambient temperature increases, the corresponding compensation air volume of the air conditioner also gradually increases.

[0114] In some embodiments, the above-mentioned third preset correspondence may be represented by a third preset correspondence table, which may be pre-calibrated, and the above-mentioned third preset correspondence table may be as shown in Table 4 below.

[0115] Table 4

[0116] The data in the above third preset correspondence table are only exemplary illustrations for ease of understanding, and do not represent real data. For example, the above-mentioned FB1 refers to the compensation air volume FB in the first column of Table 4, that is, the compensation air volume FB1 when the ambient temperature is P1. The embodiments of the present application do not limit the specific value of the compensation air volume FB.

[0117] In the above Table 4, the ambient temperature is positively correlated with the compensation air volume. For example, when the ambient temperatures P1, P2, P3, and P4 gradually increase, that is, P1<P2<P3<P4, the compensation air volumes FB1, FB2, FB3, and FB4 also gradually increase, that is, FB1<FB2<FB3<FB4.

[0118] For the actual air volume corresponding to the above air conditioner, the actual air volume may be determined based on the energy requirement parameter required for the air conditioner to perform cooling.

[0119] Specifically, based on the energy requirement parameter required for the air conditioner to perform cooling, a fifth preset correspondence is queried to determine the actual air volume corresponding to the air conditioner; wherein the above-mentioned fifth preset correspondence is used to describe the correspondence between the energy requirement parameter and the actual air volume corresponding to the air conditioner; in the fifth preset correspondence, when the energy requirement parameter is greater than or equal to the second preset energy requirement parameter threshold, the energy requirement parameter is positively correlated with the actual air volume, and when the energy requirement parameter is less than the second preset energy requirement parameter threshold, the energy requirement parameter is negatively correlated with the actual air volume.

[0120] In the above fifth preset correspondence, when the energy requirement parameter is greater than or equal to the second preset energy requirement parameter threshold, the actual air volume gradually increases as the energy requirement parameter increases; when the energy requirement parameter is less than the second preset energy requirement parameter threshold, the actual air volume gradually increases as the energy requirement parameter decreases.

[0121] The above-mentioned fifth preset correspondence may be represented by a fifth preset correspondence table, which may be pre-calibrated, and the above-mentioned fifth preset correspondence table may be as shown in Table 5 below.

[0122] Table 5

[0123] The data in the above fifth preset correspondence table is only an exemplary illustration for ease of understanding and does not represent real data. For example, the above FO1 refers to the actual air volume FO in the first column of Table 5, that is, the actual air volume FO1 when the energy demand parameter is Q1`. The embodiments of the present application do not limit the specific value of the actual air volume FO.

[0124] In the above Table 5, Q1`, Q2`, and Q3` are all greater than or equal to the second preset energy demand parameter threshold, and Q1`>Q2`>Q3`. The energy demand parameter is positively correlated with the actual air volume. For example, as the energy demand parameters Q3`, Q2`, and Q1` gradually increase, it indicates that the cooling demand of the passenger compartment is also gradually increasing, which further indicates that the cooling load of the passenger compartment is also gradually increasing. In order to meet the cooling load of the passenger compartment, the actual air volumes FO3, FO2, and FO1 also need to gradually increase, that is, FO1>FO2>FO3, and the actual air volume at this time is the actual cooling air volume.

[0125] In the above Table 5, Q4`, Q5`, and Q6` are all less than the second preset energy demand parameter threshold, and Q4`>Q5`>Q6`. The energy demand parameter is negatively correlated with the actual air volume. For example, as the numerical values of the energy demand parameters Q4`, Q5`, and Q6` gradually decrease, it indicates that the heating demand of the passenger compartment is also gradually increasing, which further indicates that the heating load of the passenger compartment is also gradually increasing. In order to meet the heating load of the passenger compartment, the actual air volumes FO4, FO5, and FO6 also need to gradually increase, that is, FO4<FO5<FO6, and the actual air volume at this time is the actual heating air volume.

[0126] The above second preset energy demand parameter threshold may be calibrated in advance. Optionally, the second preset energy demand parameter threshold may be calibrated to 0 in advance.

[0127] After the actual air volume and the compensation air volume are obtained, the target air volume corresponding to the air conditioner can be obtained by subtracting the compensation air volume corresponding to the air conditioner from the actual air volume corresponding to the air conditioner, which is specifically shown in the following formula:

[0128] wherein, is the target air volume corresponding to the air conditioner, is the actual air volume corresponding to the air conditioner, is the compensation air volume corresponding to the air conditioner.

[0129] After the target air volume is obtained, the air volume of the air conditioner is controlled to decrease from the actual air volume to the target air volume at a first preset rate, and the first preset rate may be calibrated to 5 m in advance 3 / s.

[0130] By controlling the air conditioner to output at the target air volume, the air volume of the air conditioner can be reduced, thereby reducing the temperature fluctuation of the evaporator.

[0131] Specifically, in the case where the target air volume is obtained, a sixth preset correspondence relationship is queried based on the target air volume to determine the target voltage of the blower of the air conditioner, and the blower is controlled to operate according to the target voltage; wherein, the above-mentioned sixth preset correspondence relationship is used to describe the correspondence between the target air volume corresponding to the air conditioner and the target voltage of the blower; in the sixth preset correspondence relationship, the target air volume is positively correlated with the target voltage.

[0132] In the above sixth preset correspondence relationship, as the target air volume corresponding to the air conditioner gradually increases, the target voltage of the blower also gradually increases.

[0133] The above sixth preset correspondence relationship may be represented by a sixth preset correspondence table, the sixth preset correspondence table may be calibrated in advance, and the above sixth preset correspondence table may be as shown in Table 6 below.

[0134] Table 6

[0135] The data in the above sixth preset correspondence relationship is only an exemplary description for ease of understanding, and does not represent real data. For example, the above V1 refers to the target voltage V in the first column of Table 6, that is, the target voltage V1 when the target air volume is FW1. The embodiments of the present application do not limit the specific value of the target voltage V.

[0136] In the above Table 6, the target air volume is positively correlated with the target voltage. For example, when the target air volumes FW1, FW2, FW3, and FW4 gradually increase, that is, FW1<FW2<FW3<FW4, the target voltages V1, V2, V3, and V4 also gradually increase, that is, V1<V2<V3<V4.

[0137] In practical applications, when it is determined that the air conditioner is not in the target state, there is no need to acquire the additional second opening degree of the first electronic expansion valve, and only the first opening degree of the first electronic expansion valve needs to be determined. Specifically, it can be determined through the following steps that the air conditioner is not in the target state.

[0138] In some embodiments, the method further comprises: if it is determined that the associated parameters related to the air conditioner satisfy any of the following conditions, determining that the air conditioner is not in the target state: the duration during which the actual opening degree reaches the preset opening degree threshold is greater than the preset duration threshold; the actual superheat of the battery cooler is less than the preset superheat threshold; the outlet temperature of the battery associated with the air conditioner is less than the preset outlet temperature threshold.

[0139] It can be understood that the above preset duration threshold is used to determine whether the duration during which the actual opening degree of the second electronic expansion valve reaches the preset opening degree threshold is relatively long, the preset duration threshold may be calibrated in advance, and optionally, the preset duration threshold may be calibrated to 50s in advance.

[0140] The aforementioned preset overheat threshold is used to determine whether the actual overheat of the battery cooler is too small. The preset overheat threshold can be pre-calibrated, and optionally, the preset overheat threshold can be pre-calibrated to 10°C.

[0141] The aforementioned preset outlet temperature threshold is used to determine whether the outlet temperature of the battery associated with the air conditioner is too low. This preset overheat threshold can be pre-calibrated.

[0142] If it is determined that the actual opening degree of the second electronic expansion valve reaches the preset opening degree threshold for a long period of time, it indicates that the battery does not currently have a large heat dissipation demand, and therefore it can be determined that the air conditioner is not in the target state.

[0143] If the actual overheat of the battery cooler is determined to be less than the preset overheat threshold, it means that the battery cooler does not currently have a large heat dissipation demand, and therefore it can be determined that the air conditioner is not in the target state.

[0144] If the outlet temperature of the battery associated with the air conditioner is determined to be lower than the preset outlet temperature threshold, it indicates that the temperature of the coolant in the battery is also low, which also indicates that the battery does not currently have a large heat dissipation demand. Therefore, it can also be determined that the air conditioner is not in the target state.

[0145] If any of the above conditions are met, it indicates that the air conditioner does not currently have a significant heat dissipation demand, and therefore it can be determined that the air conditioner is not in the target state.

[0146] In some embodiments, the method further includes: if it is determined that the air conditioner is not in the target state, determining the target superheat of the evaporator based on the target temperature of the evaporator and the ambient temperature where the air conditioner is located; determining the first opening degree of the first electronic expansion valve based on the target superheat; and controlling the actual opening degree of the first electronic expansion valve to reach the first opening degree.

[0147] It is understandable that if the target state is not determined, it means that the air conditioner does not have a large heat dissipation demand. Therefore, there is no need to obtain the second opening degree of the first electronic expansion valve. It is only necessary to look up the first preset correspondence based on the target temperature of the evaporator and the ambient temperature of the air conditioner, determine the target superheat degree corresponding to the evaporator, and determine the first opening degree of the first electronic expansion valve based on the target superheat degree corresponding to the evaporator.

[0148] When the air conditioner exits the target state, the actual opening of the first electronic expansion valve is reduced from the target opening to the first opening at a second preset rate. The second preset rate can be pre-calibrated to 1 step / s to reduce temperature fluctuations in the evaporator.

[0149] Furthermore, if it is determined that the air conditioner is not in the target state, there is no need to additionally determine the compensation air volume of the air conditioner. Therefore, when the air conditioner exits the target state, the air volume of the air conditioner is controlled to increase from the target air volume to the actual air volume at a third preset rate. The aforementioned third preset rate can be pre-calibrated to 10m. 3 / s.

[0150] Figure 2 This is a schematic flowchart of another air conditioner control method provided in the embodiments of this application.

[0151] For example, such as Figure 2 As shown, the method 200 includes: Step 201: Obtain the associated parameters related to the air conditioner; wherein, the associated parameters include the ambient temperature of the air conditioner, the actual temperature of the battery associated with the air conditioner, and the actual opening degree of the second electronic expansion valve corresponding to the battery cooler.

[0152] Step 202: Determine whether the ambient temperature is greater than a preset ambient temperature threshold. If yes, proceed to step 203; otherwise, continue with step 202.

[0153] Step 203: Determine whether the actual temperature is greater than the preset battery temperature threshold. If yes, proceed to step 204; otherwise, continue with step 203.

[0154] Step 204: Determine whether the actual opening degree of the second electronic expansion valve has reached the preset opening degree. If yes, proceed to step 205; otherwise, continue with step 204.

[0155] Step 205: Obtain the target temperature of the evaporator.

[0156] Step 206: Based on the target temperature and the ambient temperature, query the first preset correspondence to determine the target superheat corresponding to the evaporator.

[0157] Step 207: Determine the first opening degree of the first electronic expansion valve based on the target superheat corresponding to the evaporator.

[0158] Step 208: If the air conditioner is in the target state, based on the target temperature and the ambient temperature, query the second preset correspondence to determine the second opening degree of the first electronic expansion valve.

[0159] Step 209: Determine the target opening of the first electronic expansion valve based on the first opening and the second opening.

[0160] Step 210: Control the actual opening degree of the first electronic expansion valve to reach the target opening degree.

[0161] Step 211: Based on the ambient temperature of the air conditioner, query the third preset correspondence to determine the corresponding compensation air volume of the air conditioner.

[0162] Step 212: Determine the target air volume for the air conditioner based on the actual air volume and the compensation air volume.

[0163] Step 213: Control the air conditioner to output air according to the target air volume.

[0164] In summary, the air conditioning control method provided in this application has the following beneficial effects: The first opening degree of the first electronic expansion valve is determined based on the target temperature of the evaporator and the ambient temperature of the air conditioner. Then, assuming the air conditioner is in the target state, the second opening degree of the first electronic expansion valve is further determined based on the same parameters. The target opening degree of the first electronic expansion valve is determined based on both the first and second opening degrees. The actual opening degree of the first electronic expansion valve is then controlled to reach this target opening degree. This achieves tiered and compensatory control of the first electronic expansion valve under both passenger cabin cooling and battery cooling conditions. Here, the target state represents the air conditioner's operation in both passenger cabin cooling and battery cooling states; the first opening degree represents the required opening degree of the first electronic expansion valve when the air conditioner is not in the target state; and the second opening degree represents the opening degree required to compensate for the first opening degree when the air conditioner is in the target state. Since the first opening provides the basic opening under non-target conditions, it can ensure the basic control requirements of the first electronic expansion valve under normal operating conditions; the second opening only compensates for the first opening under target conditions, and can correct for the situation where the refrigerant is diverted to the battery cooler and the refrigerant flow changes on the evaporator side when the passenger cabin cooling and battery cooling are carried out simultaneously. This reduces the evaporator temperature fluctuation and air conditioning outlet temperature fluctuation caused by insufficient evaporator refrigerant when the passenger cabin cooling and battery cooling are in operation.

[0165] Figure 3 This is a schematic diagram of the structure of an air conditioner control device provided in an embodiment of this application.

[0166] For example, such as Figure 3 As shown, the device 300 includes: The first determining module 301 is used to determine the first opening degree of the first electronic expansion valve based on the target temperature of the evaporator and the ambient temperature of the air conditioner; wherein the first opening degree is used to represent the opening degree that the first electronic expansion valve needs to reach when the air conditioner is not in the target state.

[0167] The second determining module 302 is used to determine the second opening degree of the first electronic expansion valve based on the target temperature of the evaporator and the ambient temperature of the air conditioner when the air conditioner is determined to be in the target state; wherein, the target state is used to indicate that the air conditioner is in the state of passenger cabin cooling and battery cooling; the second opening degree is used to indicate the opening degree required to compensate the first opening degree when the air conditioner is in the target state.

[0168] The third determining module 303 is used to determine the target opening degree of the first electronic expansion valve based on the first opening degree and the second opening degree.

[0169] The control module 304 is used to control the actual opening degree of the first electronic expansion valve to reach the target opening degree.

[0170] In one possible implementation, the first determining module is specifically used to: determine the target superheat corresponding to the evaporator based on the target temperature and the ambient temperature; and determine the first opening degree of the first electronic expansion valve based on the target superheat corresponding to the evaporator.

[0171] In one possible implementation, the first determining module is specifically used to: query a first preset correspondence based on the target temperature and the ambient temperature to determine the target superheat corresponding to the evaporator; wherein, the first preset correspondence is used to describe the correspondence between the combination of the target temperature and the ambient temperature and the target superheat; in the first preset correspondence, when the ambient temperature remains unchanged, the target temperature and the target superheat are positively correlated.

[0172] In one possible implementation, the second determining module is specifically used to: query a second preset correspondence based on the target temperature and the ambient temperature to determine the second opening degree of the first electronic expansion valve; wherein, the second preset correspondence is used to describe the correspondence between the combination of the target temperature and the ambient temperature and the second opening degree; in the second preset correspondence, when the target temperature is greater than or equal to a preset temperature threshold, the target temperature and the second opening degree are negatively correlated when the ambient temperature remains unchanged; when the target temperature is less than the preset temperature threshold, the second opening degree is 0; when the target temperature is greater than or equal to the preset temperature threshold, the ambient temperature and the second opening degree are positively correlated when the target temperature remains unchanged.

[0173] In one possible implementation, the device further includes a fourth determining module, which is specifically used to: determine the compensation air volume corresponding to the air conditioner based on the ambient temperature where the air conditioner is located; determine the target air volume corresponding to the air conditioner based on the actual air volume and the compensation air volume; and control the air conditioner to output according to the target air volume.

[0174] In one possible implementation, the fourth determining module is specifically used to: query a third preset correspondence based on the ambient temperature to determine the compensation air volume; wherein, the third preset correspondence is used to determine the correspondence between the ambient temperature and the compensation air volume; in the third preset correspondence, the ambient temperature and the compensation air volume are positively correlated.

[0175] In one possible implementation, the air conditioner further includes a battery cooler and a second electronic expansion valve corresponding to the battery cooler; the device also includes a fifth determining module, which is specifically used to: acquire associated parameters related to the air conditioner; wherein, the associated parameters include the ambient temperature where the air conditioner is located, the actual temperature of the battery associated with the air conditioner, and the actual opening degree of the second electronic expansion valve; if the ambient temperature is greater than a preset ambient temperature threshold, the actual temperature is greater than a preset battery temperature threshold, and the actual opening degree of the second electronic expansion valve reaches a preset opening degree threshold, then it is determined that the air conditioner is in the target state.

[0176] In one possible implementation, the device further includes a sixth determining module, which is specifically used to: determine that the air conditioner is not in the target state if the associated parameters related to the air conditioner meet any of the following conditions: the duration of the actual opening degree reaching the preset opening degree threshold is greater than the preset duration threshold; the actual superheat of the battery cooler is less than the preset superheat threshold; and the outlet temperature of the battery associated with the air conditioner is less than the preset outlet temperature threshold.

[0177] In one possible implementation, the device further includes a seventh determining module, which is specifically used to: if it is determined that the air conditioner is not in the target state, determine the target superheat of the evaporator based on the target temperature of the evaporator and the ambient temperature where the air conditioner is located; determine the first opening degree of the first electronic expansion valve based on the target superheat; and control the actual opening degree of the first electronic expansion valve to reach the first opening degree.

[0178] Figure 4 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this application.

[0179] For example, such as Figure 4 As shown, the vehicle 400 includes a memory 401 and a processor 402. The memory 401 stores executable program code 4011, and the processor 402 is used to call and execute the executable program code 4011 to perform an air conditioning control method.

[0180] Furthermore, embodiments of this application also protect an apparatus that may include a memory and a processor, wherein the memory stores executable program code, and the processor is used to call and execute the executable program code to perform an air conditioner control method provided in embodiments of this application.

[0181] This embodiment can divide the device into functional modules based on the above method example. For example, each module can correspond to a separate function, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware. It should be noted that the module division in this embodiment is illustrative and only represents one logical functional division. In actual implementation, there may be other division methods.

[0182] When each functional module is divided according to its corresponding function, the device may further include a determining module, a second determining module, a third determining module, and a control module, etc. It should be noted that all relevant content of each step involved in the above method embodiments can be referenced from the functional description of the corresponding functional module, and will not be repeated here.

[0183] It should be understood that the device provided in this embodiment is used to execute the above-described air conditioner control method, and therefore can achieve the same effect as the above-described implementation method.

[0184] When using an integrated unit, the device may include a processing module and a storage module. When the device is applied to a vehicle, the processing module can be used to control and manage the vehicle's movements. The storage module can be used to support the vehicle in executing relevant program code.

[0185] The processing module may be a processor or a controller, which can implement or execute various exemplary logic blocks, modules, and circuits shown in conjunction with the disclosure of this application. The processor may also be a combination of functions that implement computing capabilities, such as a combination of one or more microprocessors, a combination of digital signal processing (DSP) and a microprocessor, etc., and the storage module may be a memory.

[0186] In addition, the device provided in the embodiments of this application may specifically be a chip, component or module. The chip may include a connected processor and a memory. The memory is used to store instructions. When the processor calls and executes the instructions, the chip can execute an air conditioner control method provided in the above embodiments.

[0187] This embodiment also provides a computer-readable storage medium storing computer program code. When the computer program code is run on a computer, the computer executes the above-described related method steps to implement the air conditioner control method provided in the above embodiment.

[0188] This embodiment also provides a computer program product. When the computer program product is run on a computer, it causes the computer to perform the above-mentioned related steps to realize the air conditioner control method provided in the above embodiment.

[0189] In this embodiment, the device, computer-readable storage medium, computer program product, or chip are all used to execute the corresponding methods provided above. Therefore, the beneficial effects they can achieve can be referred to the beneficial effects in the corresponding methods provided above, and will not be repeated here.

[0190] Through the above description of the embodiments, those skilled in the art will understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0191] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0192] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for controlling an air conditioner, characterized in that, The air conditioner includes an evaporator and a first electronic expansion valve corresponding to the evaporator, and the method includes: Based on the target temperature of the evaporator and the ambient temperature of the air conditioner, the first opening degree of the first electronic expansion valve is determined; wherein, the first opening degree is used to represent the opening degree that the first electronic expansion valve needs to reach when the air conditioner is not in the target state; When the air conditioner is determined to be in the target state, a second opening degree of the first electronic expansion valve is determined based on the target temperature of the evaporator and the ambient temperature of the air conditioner; wherein, the target state is used to indicate that the air conditioner is in a state of passenger cabin cooling and battery cooling; the second opening degree is used to indicate the opening degree required to compensate for the first opening degree when the air conditioner is in the target state. Based on the first opening degree and the second opening degree, the target opening degree of the first electronic expansion valve is determined; The actual opening degree of the first electronic expansion valve is controlled to reach the target opening degree.

2. The method according to claim 1, characterized in that, Determining the first opening degree of the first electronic expansion valve based on the target temperature of the evaporator and the ambient temperature of the air conditioner includes: Based on the target temperature and the ambient temperature, the target superheat corresponding to the evaporator is determined; The first opening degree of the first electronic expansion valve is determined based on the target superheat corresponding to the evaporator.

3. The method according to claim 2, characterized in that, Determining the target superheat of the evaporator based on the target temperature and the ambient temperature includes: Based on the target temperature and the ambient temperature, a first preset correspondence is queried to determine the target superheat corresponding to the evaporator; wherein, the first preset correspondence is used to describe the correspondence between the combination of the target temperature and the ambient temperature and the target superheat; in the first preset correspondence, when the ambient temperature remains unchanged, the target temperature and the target superheat are positively correlated.

4. The method according to claim 1, characterized in that, Determining the second opening degree of the first electronic expansion valve based on the target temperature of the evaporator and the ambient temperature of the air conditioner includes: Based on the target temperature and the ambient temperature, a second preset correspondence is queried to determine the second opening degree of the first electronic expansion valve; wherein, the second preset correspondence is used to describe the correspondence between the combination of the target temperature and the ambient temperature and the second opening degree; In the second preset correspondence, when the target temperature is greater than or equal to the preset temperature threshold, the target temperature is negatively correlated with the second opening degree when the ambient temperature remains unchanged; when the target temperature is less than the preset temperature threshold, the second opening degree is 0. When the target temperature is greater than or equal to a preset temperature threshold, the ambient temperature is positively correlated with the second opening degree while the target temperature remains unchanged.

5. The method according to claim 1, characterized in that, If the air conditioner is determined to be in the target state, the method further includes: Based on the ambient temperature where the air conditioner is located, determine the corresponding compensation air volume for the air conditioner; Based on the actual air volume corresponding to the air conditioner and the compensation air volume, the target air volume corresponding to the air conditioner is determined; The air conditioner is controlled to output air according to the target air volume.

6. The method according to claim 5, characterized in that, The step of determining the compensation air volume corresponding to the air conditioner based on the ambient temperature includes: Based on the ambient temperature, a third preset correspondence is queried to determine the compensation air volume; wherein, the third preset correspondence is used to determine the correspondence between the ambient temperature and the compensation air volume; in the third preset correspondence, the ambient temperature and the compensation air volume are positively correlated.

7. The method according to claim 1, characterized in that, The air conditioner also includes a battery cooler and a second electronic expansion valve corresponding to the battery cooler; Before determining the second opening degree of the first electronic expansion valve based on the target temperature of the evaporator and the ambient temperature of the air conditioner, after determining that the air conditioner is in the target state, the method further includes: Obtain the associated parameters related to the air conditioner; wherein, the associated parameters include the ambient temperature where the air conditioner is located, the actual temperature of the battery associated with the air conditioner, and the actual opening degree of the second electronic expansion valve; If the ambient temperature is greater than a preset ambient temperature threshold, the actual temperature is greater than a preset battery temperature threshold, and the actual opening degree of the second electronic expansion valve reaches a preset opening degree threshold, then the air conditioner is determined to be in the target state.

8. The method according to claim 7, characterized in that, The method further includes: If any of the associated parameters related to the air conditioner are determined to meet any of the following conditions, then the air conditioner is determined not to be in the target state: The duration during which the actual opening degree reaches the preset opening threshold is greater than the preset duration threshold. The actual overheating of the battery cooler is less than the preset overheating threshold. The outlet temperature of the battery associated with the air conditioner is lower than a preset outlet temperature threshold.

9. The method according to claim 1, characterized in that, The method further includes: If it is determined that the air conditioner is not in the target state, then the target superheat of the evaporator is determined based on the target temperature of the evaporator and the ambient temperature where the air conditioner is located. Based on the target superheat, determine the first opening degree of the first electronic expansion valve; Control the actual opening degree of the first electronic expansion valve to reach the first opening degree.

10. A vehicle, characterized in that, The air conditioner includes: Memory, used to store executable program code; A processor for calling and running the executable program code from the memory, causing the vehicle to perform the method as described in any one of claims 1 to 9.

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