Automobile fan air volume determination method and device, electronic equipment and medium

Abstract

The invention relates to the field of vehicle heat management, in particular to an automobile fan air volume determining method and device, electronic equipment and a medium. The method comprises the steps that the air volume requirement of a cooling liquid loop is determined according to the battery end temperature, the motor end temperature and the environment temperature; according to the environment temperature and the first difference value, the air volume requirement of a refrigerant loop is determined; the first difference value is the difference value between the outlet saturation temperature and the environment temperature or the difference value between the environment temperature and the inlet saturation temperature; determining vehicle speed compensation air volume according to the vehicle speed and the vehicle air inlet area; and the fan air volume is determined according to the cooling liquid loop air volume requirement, the refrigerant loop air volume requirement and the vehicle speed compensation air volume. The more accurate fan air volume can be obtained, and then the energy consumption of fan operation is reduced.

Description

Technical Field

[0001] The present application relates to the field of vehicle thermal management, and more specifically, to a method, device, electronic device and medium for determining the air volume of an automobile fan. Background Art

[0002] The existing automotive cooling fan control is generally composed of two parts: the coolant circuit and the refrigerant circuit. The coolant circuit is mainly controlled by determining the duty cycle through the temperature of the components or the coolant temperature, and the refrigerant circuit is controlled by determining the duty cycle through the outlet pressure. However, this method can only meet the heat dissipation requirements, that is, the duty cycle is usually larger to meet the heat dissipation requirements, but it cannot accurately assess the air volume requirements for heat dissipation, and the fan control cannot be better matched according to the air volume requirements, thereby reducing the energy consumption of the fan operation.

[0003] In view of this, this application is hereby filed. Summary of the invention

[0004] The purpose of the present application is to provide a method, device, electronic device and medium for determining the air volume of an automobile fan, so as to solve the problem that the existing technology cannot accurately evaluate the air volume requirement for heat dissipation.

[0005] In order to achieve the above objectives, this application adopts the following technical solutions: In a first aspect, the present application provides a method for determining the air volume of a vehicle fan, comprising: Determine the air volume requirement of the coolant circuit according to the battery terminal temperature, motor terminal temperature and ambient temperature; Determine the refrigerant circuit air volume requirement according to the above ambient temperature and the first difference; the above first difference is the difference between the outlet saturation temperature and the above ambient temperature, or the difference between the above ambient temperature and the inlet saturation temperature; Determine the speed compensation air volume according to the vehicle speed and the vehicle air intake area; The fan air volume is determined based on the coolant circuit air volume requirement, the refrigerant circuit air volume requirement and the vehicle speed compensation air volume.

[0006] As a further preferred technical solution, the battery terminal temperature includes the average battery temperature and the actual battery inlet water temperature, and the motor terminal temperature includes the motor body temperature, the actual motor inlet water temperature and the motor target inlet water temperature. The cooling liquid circuit air volume requirement is determined according to the battery terminal temperature, the motor terminal temperature and the ambient temperature, including: Determine the estimated heat exchange rate of the battery based on the average battery temperature and the actual battery inlet water temperature; Determine the estimated heat exchange of the motor based on the motor body temperature and the actual motor inlet water temperature; Determine the air volume requirement of the first coolant circuit according to the estimated heat exchange of the battery, the estimated heat exchange of the motor, the actual water temperature at the motor inlet, the target water temperature at the motor inlet, and the ambient temperature; Determine the air volume requirement of the second coolant circuit according to the actual inlet water temperature of the motor; The coolant circuit air volume requirement is determined according to the first coolant circuit air volume requirement and the second coolant circuit air volume requirement.

[0007] As a further preferred technical solution, the air volume requirement of the first coolant circuit is determined according to the estimated heat exchange of the battery, the estimated heat exchange of the motor, the actual inlet water temperature of the motor, the target inlet water temperature of the motor and the ambient temperature, including: Determine the heat dissipation according to the estimated heat exchange amount of the battery and the estimated heat exchange amount of the motor; According to the actual inlet water temperature of the motor, a compensation coefficient for the air volume demand of the coolant circuit is determined; the compensation coefficient for the air volume demand of the coolant circuit is used to characterize the contribution of the actual inlet water temperature of the motor to the air volume demand of the coolant circuit; The first coolant circuit air volume requirement is determined according to the heat dissipation, the coolant circuit air volume requirement compensation coefficient, the motor target inlet water temperature and the ambient temperature.

[0008] As a further preferred technical solution, according to the actual inlet water temperature of the motor, the air volume requirement of the second coolant circuit is determined, including: According to the actual inlet water temperature of the motor, query the first database whether the actual inlet water temperature of the motor exists; the first database stores the standard actual inlet water temperature of the motor and the first standard air volume requirement corresponding to the standard actual inlet water temperature of the motor; When the actual inlet water temperature of the motor exists in the first database, the air volume requirement of the second coolant circuit is determined to be the first standard air volume requirement corresponding to the actual inlet water temperature of the motor; when the actual inlet water temperature of the motor does not exist in the first database, the linear interpolation method is used to determine the air volume requirement of the second coolant circuit.

[0009] As a further preferred technical solution, before determining the refrigerant circuit air volume requirement according to the above ambient temperature and the first difference, the method further includes: Get the working mode of the refrigerant circuit; If the working mode of the refrigerant circuit is cooling mode, the first difference is the difference between the outlet saturation temperature and the ambient temperature; If the working mode of the refrigerant circuit is the heating mode, the first difference is the difference between the ambient temperature and the inlet saturation temperature.

[0010] As a further preferred technical solution, determining the refrigerant circuit air volume requirement according to the above ambient temperature and the first difference includes: In the case where the first difference is the difference between the outlet saturation temperature and the ambient temperature, a pre-constructed second database is obtained; the second database stores the correspondence between different first differences and ambient temperatures and different refrigerant circuit air volume requirements; According to the above-mentioned ambient temperature and the above-mentioned first difference, the above-mentioned second database is queried to obtain the above-mentioned refrigerant circuit air volume requirement.

[0011] As a further preferred technical solution, determining the refrigerant circuit air volume requirement according to the above ambient temperature and the first difference includes: In the case where the first difference is the difference between the ambient temperature and the inlet saturation temperature, a pre-constructed third database is obtained; the third database stores the correspondence between different first differences and ambient temperatures and different refrigerant circuit air volume requirements; According to the above-mentioned ambient temperature and the above-mentioned first difference, the above-mentioned third database is queried to obtain the above-mentioned refrigerant circuit air volume requirement.

[0012] In a second aspect, the present application provides a device for determining the air volume of a car fan, comprising: A coolant circuit air volume demand determination module is used to determine the coolant circuit air volume demand according to the battery terminal temperature, the motor terminal temperature and the ambient temperature; A refrigerant circuit air volume demand determination module, used to determine the refrigerant circuit air volume demand according to the above-mentioned ambient temperature and a first difference; the above-mentioned first difference is the difference between the outlet saturation temperature and the above-mentioned ambient temperature, or the difference between the above-mentioned ambient temperature and the inlet saturation temperature; A vehicle speed compensation air volume determination module is used to determine the vehicle speed compensation air volume according to the vehicle speed and the vehicle air intake area; The fan air volume determination module is used to determine the fan air volume according to the coolant circuit air volume requirement, the refrigerant circuit air volume requirement and the vehicle speed compensation air volume.

[0013] In a third aspect, the present application provides an electronic device, including: at least one processor, and a memory communicatively connected to the at least one processor; The memory stores instructions that can be executed by at least one of the processors, and the instructions are executed by at least one of the processors so that the at least one processor can execute the method.

[0014] In a fourth aspect, the present application provides a computer-readable storage medium, on which computer instructions are stored, and the computer instructions are used to enable a computer to execute the above method.

[0015] Compared with the prior art, the beneficial effects of this application are: The automobile fan air volume determination method provided in the present application determines the coolant circuit air volume requirement according to the battery terminal temperature, the motor terminal temperature and the ambient temperature; determines the refrigerant circuit air volume requirement according to the ambient temperature and the first difference; determines the vehicle speed compensation air volume according to the vehicle speed and the vehicle air intake area; and finally determines the fan air volume according to the coolant circuit air volume requirement, the refrigerant circuit air volume requirement and the vehicle speed compensation air volume. The method determines the coolant circuit air volume requirement, the refrigerant circuit air volume requirement and the vehicle speed compensation air volume through specific parameters. These parameters are highly correlated with the corresponding air volume requirement or vehicle speed compensation air volume and are easy to obtain. Therefore, the air volume requirement of each circuit can be accurately known, and then the fan air volume is associated with the coolant circuit air volume requirement, the refrigerant circuit air volume requirement and the vehicle speed compensation air volume, so as to obtain a more accurate fan air volume, thereby reducing the energy consumption of the fan operation.

[0016] Furthermore, the present application respectively adopts an energy algorithm based on different temperatures and a temperature algorithm based on the actual inlet water temperature of the motor to determine the air volume requirement of the coolant circuit, and adopts a method based on the first difference and querying the corresponding database to determine the air volume requirement of the refrigerant circuit, which is more accurate and reliable than the duty cycle obtained by the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a flow chart of a method for determining the air volume of a car fan provided by the present application; Figure 2 It is a schematic diagram of the principle of automobile thermal management system; Figure 3 It is a structural schematic diagram of the automobile fan air volume determination device provided by the present application; Figure 4 It is a structural schematic diagram of the electronic device provided by this application. DETAILED DESCRIPTION

[0019] The following is a description of exemplary embodiments of the present application in conjunction with the accompanying drawings, including various details of the embodiments of the present application to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. Similarly, for the sake of clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0020] As mentioned in the background technology, the existing technology has the problem of being unable to accurately evaluate the air volume requirement for heat dissipation. In this regard, the present application determines the fan air volume based on the coolant circuit air volume requirement, the refrigerant circuit air volume requirement and the vehicle speed compensation air volume. The present application is further described in detail below in conjunction with the embodiments.

[0021] Example 1 Figure 1 This is a flow chart of a method for determining the air volume of an automobile fan provided in this embodiment. The method can be executed by an automobile fan air volume determination device, which can be composed of software and / or hardware and is generally integrated in an electronic device. The electronic device can be an ECU (electronic control unit) or a VCU (vehicle controller unit). For ease of understanding, each step in the method of this embodiment is executed by the VCU.

[0022] like Figure 1 As shown, this embodiment provides a method for determining the air volume of a car fan, comprising the following steps: S110, determining the air volume requirement of the coolant circuit according to the battery terminal temperature, the motor terminal temperature and the ambient temperature.

[0023] First of all, it should be noted that the order of steps S110-S130 in this embodiment is only an example. In fact, the three steps can be performed simultaneously or in a different order, as long as they are performed before S140. It should also be noted that the parameters involved in this embodiment will change over time, so the parameters are continuously collected in real time. Each time a fan air volume is obtained according to the method of this embodiment, it can be applied to fan air volume control.

[0024] Among them, "battery terminal temperature" refers to the temperature related to the heat dissipation of the vehicle power battery, including but not limited to the average battery temperature, the actual battery inlet water temperature, the actual battery outlet water temperature, etc. "Motor terminal temperature" refers to the temperature related to the heat dissipation of the motor, including but not limited to the motor body temperature, the actual motor inlet water temperature, the motor target inlet water temperature, the actual motor outlet water temperature, etc. "Battery average temperature" refers to the average temperature of the vehicle power battery. Since the vehicle power battery is usually composed of multiple battery packs, it is easier to determine the air volume required for its cooling by using the average temperature. "Battery actual inlet water temperature" refers to the actual water temperature at the battery inlet in the coolant circuit. "Motor body" includes the front drive motor body and the rear drive motor body. In the same circuit, the temperature of the front drive motor body and the rear drive motor body is related to their own working state. Therefore, the "motor body temperature" in this embodiment actually includes the front drive motor body temperature and the rear drive motor body temperature. The actual inlet water temperature of the front drive motor and the actual inlet water temperature of the rear drive motor are basically the same, so the "actual inlet water temperature of the motor" is uniformly used to represent the actual water temperature at the inlet of the motor in the coolant circuit. "Ambient temperature" refers to the temperature of the external environment in which the vehicle is located. The above temperatures can all be collected using temperature sensors. "Motor target inlet water temperature" refers to the pre-set target water temperature at the motor inlet in the coolant loop, which varies depending on whether the motor loop is in heat dissipation mode or insulation mode.

[0025] The fan in this embodiment is installed at the rear end of the low-temperature radiator, located at the front end of the vehicle, and its function is to force air cooling. By introducing air, it accelerates the dissipation of heat from the low-temperature radiator and effectively reduces the temperature of the cooling pipes of components connected to the low-temperature radiator.

[0026] like Figure 2 As shown in the figure, the "coolant circuit" refers to the circuit that flows through the cooling water pipes of components, such as the circuit composed of low-temperature radiators, batteries, battery water pumps, multi-way valves, electric drive water pumps, rear-drive motors, and front-drive motors. It is a circuit composed of cooling water pipes and components. The "refrigerant circuit" mainly refers to the refrigerant circulation path in the automobile air-conditioning system. It is mainly composed of a compressor, an in-vehicle condenser, a refrigeration solenoid valve, a refrigeration electronic expansion valve, an in-vehicle evaporator, and pipes connecting these components. The automobile thermal management system includes a coolant circuit and a refrigerant circuit, wherein the refrigerant circuit includes a refrigerant refrigeration circuit and a refrigerant heating circuit. Figure 2 The above circuits are shown. In the coolant circuit, the coolant flows through the low-temperature radiator, the front drive motor, the rear drive motor, the electric drive water pump, the multi-way valve, the battery water pump and the battery in sequence; in the refrigerant refrigeration circuit, the refrigerant flows through the refrigeration electronic expansion valve, the in-vehicle evaporator, the compressor, the refrigeration solenoid valve and the outdoor condenser in sequence; in the refrigerant heating circuit, the refrigerant flows through the heating electronic expansion valve, the outdoor condenser, the heating solenoid valve, the compressor and the in-vehicle condenser in sequence.

[0027] In an optional embodiment, the battery terminal temperature includes the battery average temperature and the actual battery inlet water temperature, the motor terminal temperature includes the motor body temperature, the actual motor inlet water temperature and the motor target inlet water temperature, and the coolant circuit air volume requirement is determined according to the battery terminal temperature, the motor terminal temperature and the ambient temperature, including: Determine the estimated heat exchange rate of the battery based on the average battery temperature and the actual battery inlet water temperature; Determine the estimated heat exchange of the motor based on the motor body temperature and the actual motor inlet water temperature; Determine the air volume requirement of the first coolant circuit according to the estimated heat exchange of the battery, the estimated heat exchange of the motor, the actual water temperature at the motor inlet, the target water temperature at the motor inlet, and the ambient temperature; Determine the air volume requirement of the second coolant circuit according to the actual inlet water temperature of the motor; The coolant circuit air volume requirement is determined according to the first coolant circuit air volume requirement and the second coolant circuit air volume requirement.

[0028] This embodiment decomposes the coolant circuit air volume demand into the first coolant circuit air volume demand and the second coolant circuit air volume demand. The coolant circuit air volume demand can be obtained by respectively determining the first coolant circuit air volume demand and the second coolant circuit air volume demand in a specific manner. Among them, the first coolant circuit air volume demand is obtained based on an energy algorithm at different temperatures, and the second coolant circuit air volume demand is obtained based on a temperature algorithm based on the actual inlet water temperature of the motor. Compared with obtaining the corresponding duty cycle only by looking up a table, it is more accurate and reliable. Among them, "the first coolant circuit air volume demand" refers to the air volume demand determined based on the heat dissipation of the coolant circuit. "The second coolant circuit air volume demand" refers to the air volume demand determined based on the water temperature change of the coolant circuit. After obtaining the first coolant circuit air volume demand and the second coolant circuit air volume demand, the larger value of the two is used as the coolant circuit air volume demand.

[0029] It should be noted that the actual vehicle coolant circuit includes two types, namely the motor circuit, and the motor circuit and the battery circuit in series. In the case where the coolant circuit type is the motor circuit, there is actually no "actual battery inlet water temperature", so the water temperature can be determined to be 0, and the estimated battery heat exchange is 0. Therefore, in another optional embodiment, the above-mentioned determination of the coolant circuit air volume requirement based on the battery terminal temperature, the motor terminal temperature and the ambient temperature can also be: judging the coolant circuit type; in the case where the above-mentioned coolant circuit type is the motor circuit, the coolant circuit air volume requirement is determined according to the front drive motor body temperature, the rear drive motor body temperature and the actual motor inlet water temperature; in the case where the above-mentioned coolant circuit type is the motor circuit and the battery circuit in series, the coolant circuit air volume requirement is determined according to the average battery temperature, the actual battery inlet water temperature, the front drive motor body temperature, the rear drive motor body temperature and the actual motor inlet water temperature. This embodiment is essentially the same as the above-mentioned embodiment, but it is slightly different in form.

[0030] Optionally, the estimated heat exchange amount of the battery is calculated using the following formula: estimated heat exchange amount of the battery = (average battery temperature - actual battery inlet water temperature) / battery thermal resistance coefficient. The battery thermal resistance coefficient can be obtained by testing with a professional thermal resistance test instrument (the principle is to arrange a separate heating source and a temperature sensor, and calculate the thermal resistance of the object based on the temperature change of the object).

[0031] Since the faster the fluid speed, the smaller the thermal resistance, the battery thermal resistance coefficient needs to be corrected according to the battery water flow demand by looking up a one-dimensional table. The specific method is as follows: Test the thermal resistance (obtained by a thermal resistance instrument) under the control of different duty cycles of the water pump (10%~100% corresponds to the water pump stopping to full speed operation) in sections, and then record it. Finally, obtain the corresponding thermal resistance coefficient by looking up the table of the water pump duty cycle. Table 1 shows the relationship between the water pump duty cycle and the thermal resistance coefficient.

[0032] Table 1 Relationship between water pump duty cycle and thermal resistance coefficient

[0033] Table 1 is calibrated in the following way: by testing the thermal resistance (obtained by thermal resistance instrument) under different duty ratios of the water pump (10-100% corresponding to the water pump stopping to full speed operation) in sections, and then recording. By looking up the duty ratio of the water pump in Table 1, the corresponding thermal resistance coefficient can be obtained.

[0034] Optionally, the estimated heat exchange amount of the motor is calculated using the following formula: Here, the thermal resistance coefficient of the front drive motor and the thermal resistance coefficient of the rear drive motor are obtained in a similar way to the thermal resistance coefficient of the battery, which will not be repeated here.

[0035] Optionally, as mentioned above, since parameters such as temperature are collected in real time, there may be some abnormal fluctuations on the temperature curve. In this case, first-order lag filtering is required to improve the reliability of the data.

[0036] In an optional embodiment, the air volume requirement of the first coolant circuit is determined according to the estimated heat exchange amount of the battery, the estimated heat exchange amount of the motor, the actual inlet water temperature of the motor, the target inlet water temperature of the motor and the ambient temperature, including: Determine the heat dissipation according to the estimated heat exchange amount of the battery and the estimated heat exchange amount of the motor; According to the actual inlet water temperature of the motor, a compensation coefficient for the air volume demand of the coolant circuit is determined; the compensation coefficient for the air volume demand of the coolant circuit is used to characterize the contribution of the actual inlet water temperature of the motor to the air volume demand of the coolant circuit; The first coolant circuit air volume requirement is determined according to the heat dissipation, the coolant circuit air volume requirement compensation coefficient, the motor target inlet water temperature and the ambient temperature.

[0037] Optionally, heat dissipation = estimated battery heat exchange amount + estimated motor heat exchange amount.

[0038] Table 2 shows the relationship between the actual motor inlet temperature and the coolant circuit air volume demand compensation coefficient. Optionally, the coolant circuit air volume demand compensation coefficient is determined using Table 2, where T1 is the highest motor circuit water temperature in the 38°C thermal balance test of the vehicle. When the actual motor inlet water temperature is neither less than or equal to T1-10°C, nor greater than or equal to T1, nor equal to T1-5°C, the corresponding compensation coefficient is determined using linear interpolation.

[0039] Table 2 Relationship between actual motor inlet temperature and compensation coefficient of coolant circuit air volume demand

[0040] For example, if the actual motor inlet temperature is T1, the cooling liquid circuit air volume demand compensation coefficient is 20%. If the actual motor inlet temperature is T1-5°C, the cooling liquid circuit air volume demand compensation coefficient is 10%.

[0041] Optionally, the air volume requirement of the first coolant circuit can be calculated using the following formula: .

[0042] The unit of heat dissipation is W, the unit of temperature is °C, the air density is 1.05~1.2kg / m³, and the specific heat capacity of air at constant pressure is .

[0043] In an optional implementation, determining the air volume requirement of the second coolant circuit according to the actual inlet water temperature of the motor includes: According to the actual inlet water temperature of the motor, query the first database whether the actual inlet water temperature of the motor exists; the first database stores the standard actual inlet water temperature of the motor and the first standard air volume requirement corresponding to the standard actual inlet water temperature of the motor; When the actual inlet water temperature of the motor exists in the first database, the air volume requirement of the second coolant circuit is determined to be the first standard air volume requirement corresponding to the actual inlet water temperature of the motor; when the actual inlet water temperature of the motor does not exist in the first database, the linear interpolation method is used to determine the air volume requirement of the second coolant circuit.

[0044] Among them, "standard motor actual inlet water temperature" refers to the actual inlet water temperature of the motor used in the simulation or calibration test. "First standard air volume requirement" refers to the air volume requirement obtained in the simulation or calibration test.

[0045] Optionally, the first database is as shown in Table 3: Table 3 The first database

[0046] For example, if the actual inlet water temperature of the motor is 60°C, and the actual inlet water temperature of the motor is found in the first database, the air volume requirement of the second coolant circuit is determined to be the first standard air volume requirement corresponding to the actual inlet water temperature of the motor, that is, F3. If the actual inlet water temperature of the motor is 55°C, and the actual inlet water temperature of the motor is not found in the first database, the linear interpolation method is used to determine the air volume requirement of the second coolant circuit to be (F3-F2) / 2+F2.

[0047] Optionally, the first database is constructed in the following manner: Define the first air volume requirement when the actual inlet water temperature of the standard motor is less than or equal to the above standard motor heat dissipation temperature point as 0; Collect the second air volume requirement of the above standard motor with the actual inlet water temperature as the derating point in the thermal simulation test; The air volume requirements at other temperature points are determined according to the first air volume requirement and the second air volume requirement, where the other temperature points are temperature points between the heat dissipation temperature point and the derating point.

[0048] The thermal simulation test may be a 38°C thermal balance simulation test.

[0049] The first database can be obtained by calibration method, which is: start from the water temperature that the motor actually needs to dissipate heat and the temperature range of the highest water temperature point of the thermal balance test exceeding 38°C, and the air volume demand is 0 when it is less than the heat dissipation temperature point of the components. When it reaches the starting derating point (after the derating point, the operation of the components is not good for the components, so the derating point is the highest temperature point for the normal operation of the components), the air volume demand is replaced by the air volume simulated by the thermal simulation modeling. The corresponding air volume demand is calculated by the linear difference method for other temperature points in the middle.

[0050] S120. Determine the refrigerant circuit air volume requirement based on the above-mentioned ambient temperature and the first difference; the above-mentioned first difference is the difference between the outlet saturation temperature and the ambient temperature, or the difference between the ambient temperature and the inlet saturation temperature.

[0051] Among them, "outlet saturation temperature" refers to the saturation temperature corresponding to the compressor outlet pressure. "Inlet saturation temperature" refers to the saturation temperature corresponding to the compressor inlet pressure. The above outlet pressure or inlet pressure is collected by the pressure sensor.

[0052] In an optional implementation, before determining the refrigerant circuit air volume requirement according to the ambient temperature and the first difference, the method further includes: Get the working mode of the refrigerant circuit; If the working mode of the refrigerant circuit is the cooling mode, the first difference is the difference between the outlet saturation temperature and the ambient temperature; If the working mode of the refrigerant circuit is the heating mode, the first difference is the difference between the ambient temperature and the inlet saturation temperature.

[0053] In this embodiment, the working mode of the refrigerant circuit is firstly obtained, and different values ​​are used for the first difference in different working modes, so as to improve the accuracy of the first difference.

[0054] In an optional implementation, determining the refrigerant circuit air volume requirement according to the ambient temperature and the first difference includes: In the case where the first difference is the difference between the outlet saturation temperature and the ambient temperature, a pre-constructed second database is obtained; the second database stores the correspondence between different first differences and ambient temperatures and different refrigerant circuit air volume requirements; The second database is queried according to the ambient temperature and the first difference to obtain the refrigerant circuit air volume requirement.

[0055] The second database is constructed when the working mode of the refrigerant circuit is the cooling mode. Optionally, the second database is constructed in the following manner: Obtaining a first difference value at the beginning of a first calibration test; Collect the air volume of the first refrigerant circuit when the first difference is stable and reaches a preset first difference under different test environment temperatures and different test compressor speeds; The test environment temperature is taken as the standard environment temperature, the first difference at the beginning of the calibration test is taken as the standard first difference, and the first refrigerant circuit air volume is taken as the second standard air volume requirement to construct a second database.

[0056] The above-mentioned “first calibration test” refers to a calibration test when the air conditioner is operating in cooling mode.

[0057] In the process of constructing the second database, different test environment temperatures may be 16-40°C, different test compressor speeds may be 1000-8000 rpm, every 1000 revolutions is a test point, and the preset first difference is 10-20°C.

[0058] The second database can be obtained by a calibration method, and the calibration method is: If the working mode of the refrigerant circuit is the cooling mode, it is necessary to release heat to the environment, and the difference between the outlet saturation temperature and the ambient temperature is usually around 10-20°C. Therefore, the required air volume is calibrated according to this difference range. The calibration principle is to calibrate a fixed compressor speed (1000-8000rpm) when the working mode of the refrigerant circuit is turned on in the cooling mode at different ambient temperatures (16-40°C), and every 1000 revolutions are a test point. After the difference between the outlet saturation temperature and the ambient temperature stabilizes, the air volume demand of the refrigerant circuit is calibrated. Collect observation data and calculate whether the difference between the outlet saturation temperature and the ambient temperature is within 10-20 degrees Celsius. If it is not in this range, calibrate and adjust the air volume demand of the refrigerant circuit until the temperature difference meets the range requirement of 10-20°C. After the temperature difference meets the requirements, finally record the difference between the outlet saturation temperature and the ambient temperature at the beginning of the test, the ambient temperature value, and the calibrated air volume demand value when the temperature difference is met, so as to obtain the second database.

[0059] In an optional implementation, determining the refrigerant circuit air volume requirement according to the ambient temperature and the first difference includes: In the case where the first difference is the difference between the ambient temperature and the inlet saturation temperature, a pre-constructed third database is obtained; the third database stores the correspondence between different first differences and ambient temperatures and different refrigerant circuit air volume requirements; The third database is queried according to the ambient temperature and the first difference to obtain the refrigerant circuit air volume requirement.

[0060] The third database is constructed when the working mode of the refrigerant circuit is heating mode. Optionally, the third database is constructed in the following manner: Obtaining a first difference value at the beginning of a second calibration test; Collect the air volume of the second refrigerant circuit when the first difference is stable and reaches a preset first difference under different test environment temperatures and different test compressor speeds; The test environment temperature is taken as the standard environment temperature, the first difference at the beginning of the calibration test is taken as the standard first difference, and the second refrigerant circuit air volume is taken as the third standard air volume requirement to construct a third database.

[0061] The "second calibration test" refers to a calibration test in which the air conditioner operates in heating mode.

[0062] In the process of constructing the third database, different test environment temperatures can be -25~16°C, different test compressor speeds can be 1000~8000rpm, every 1000 revolutions is a test point, and the preset first difference is 10~20°C.

[0063] The third database can be obtained by a calibration method, and the calibration method is: If the working mode of the refrigerant circuit is heating mode, it is necessary to absorb heat from the environment, and the ambient temperature and the inlet saturation temperature are usually around 10-20°C, which is more appropriate. The calibration principle is to calibrate a fixed compressor speed (1000-8000rpm) when the working mode of the refrigerant circuit is turned on in heating mode at different ambient temperatures (-25-16°C), and every 1000 revolutions are a test point. After the difference between the ambient temperature and the inlet saturation temperature stabilizes, the air volume demand of the refrigerant circuit is calibrated. Collect observation data and calculate whether the difference between the ambient temperature and the inlet saturation temperature is within 10-20 degrees Celsius. If it is not in this range, calibrate and adjust the air volume demand of the refrigerant circuit until the temperature difference meets the range requirement of 10-20°C. After the temperature difference meets the requirements, finally record the difference between the ambient temperature and the inlet saturation temperature at the beginning of the test, the ambient temperature value, and the calibrated air volume demand value when the temperature difference is met, so as to obtain the third database.

[0064] The above second and third databases are constructed using relevant data from the calibration test. At the beginning of the calibration test, there is a specific value of the first difference. As the test progresses, the specific value of the first difference will change. When it stabilizes near a value and reaches the preset first difference, the corresponding air volume at this time is reasonable, so it is determined as the corresponding standard air volume. If during the test, the specific value of the first difference first stabilizes near a value, but does not reach the preset first difference, then the air volume in the refrigerant circuit needs to be adjusted so that the first difference reaches the preset first difference, and the air volume at this time is determined as the corresponding standard air volume.

[0065] S130: Determine the speed compensation air volume according to the vehicle speed and the vehicle air intake area.

[0066] Optionally, the vehicle speed compensation air volume is calculated using the following formula: vehicle speed compensation air volume = vehicle speed * vehicle air intake area * air density. Similar to the aforementioned temperature parameter, the vehicle speed is also preferably filtered.

[0067] S140, determining the fan air volume according to the coolant circuit air volume requirement, the refrigerant circuit air volume requirement and the vehicle speed compensation air volume.

[0068] Optionally, the fan air volume is calculated using the following formula: fan air volume = max (coolant circuit air volume requirement, refrigerant circuit air volume requirement) - vehicle speed compensation air volume.

[0069] The above-mentioned method for determining the air volume of a car fan determines the coolant circuit air volume requirement according to the battery terminal temperature, the motor terminal temperature and the ambient temperature; determines the refrigerant circuit air volume requirement according to the ambient temperature and the first difference; determines the vehicle speed compensation air volume according to the vehicle speed and the vehicle air intake area; and finally determines the fan air volume according to the coolant circuit air volume requirement, the refrigerant circuit air volume requirement and the vehicle speed compensation air volume. The method determines the coolant circuit air volume requirement, the refrigerant circuit air volume requirement and the vehicle speed compensation air volume through specific parameters. These parameters are highly correlated with the corresponding air volume requirement or vehicle speed compensation air volume and are easy to obtain. Therefore, the air volume requirement of each circuit can be accurately known, and then the fan air volume is associated with the coolant circuit air volume requirement, the refrigerant circuit air volume requirement and the vehicle speed compensation air volume, so as to obtain a more accurate fan air volume, thereby reducing the energy consumption of the fan operation.

[0070] Furthermore, the present application respectively adopts an energy algorithm based on different temperatures and a temperature algorithm based on the actual inlet water temperature of the motor to determine the air volume requirement of the coolant circuit, and adopts a method based on the first difference and querying the corresponding database to determine the air volume requirement of the refrigerant circuit, which is more accurate and reliable than the existing technology for obtaining the corresponding duty cycle.

[0071] In an optional implementation, after determining the fan air volume according to the coolant circuit air volume requirement, the refrigerant circuit air volume requirement and the vehicle speed compensation air volume, the method further includes: In response to the fan enabling state being changed to being inoperative, it is determined that the fan air volume remains the same as the last air volume before the enabling state is changed within a preset time.

[0072] This implementation can avoid frequent starts and stops of the fan. The above-mentioned "preset time" is, for example, 10-15 seconds.

[0073] Optionally, during the fan control process, an air intake table of the fan under different duty cycles can be obtained, and the fan air volume obtained according to the above method can be looked up in the table to obtain the corresponding fan duty cycle control target for controlling the fan air output.

[0074] Example 2 like Figure 3 As shown, this embodiment provides a device for determining the air volume of a car fan, comprising: A coolant circuit air volume requirement determination module 201 is used to determine the coolant circuit air volume requirement according to the battery terminal temperature, the motor terminal temperature and the ambient temperature; A refrigerant circuit air volume demand determination module 202 is used to determine the refrigerant circuit air volume demand according to the above-mentioned ambient temperature and a first difference; the above-mentioned first difference is the difference between the outlet saturation temperature and the above-mentioned ambient temperature, or the difference between the above-mentioned ambient temperature and the inlet saturation temperature; The vehicle speed compensation air volume determination module 203 is used to determine the vehicle speed compensation air volume according to the vehicle speed and the vehicle air intake area; The fan air volume determination module 204 is used to determine the fan air volume according to the coolant circuit air volume requirement, the refrigerant circuit air volume requirement and the vehicle speed compensation air volume.

[0075] The device is used to execute the above method, and thus has at least functional modules and beneficial effects corresponding to the above method.

[0076] Example 3 like Figure 4 As shown, this embodiment provides an electronic device, including: at least one processor; and A memory communicatively connected to at least one of the above processors; wherein, The memory stores instructions executable by at least one of the processors, and the instructions are executed by at least one of the processors so that the at least one processor can perform the method. At least one processor in the electronic device can perform the method, and thus has at least the same advantages as the method.

[0077] Optionally, the electronic device also includes interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. The various components are connected to each other using different buses and can be installed on a common mainboard or installed in other ways as needed. The processor can process instructions executed in the electronic device, including instructions stored in or on a memory to display graphical information of a GUI (Graphical User Interface) on an external input / output device (such as a display device coupled to an interface). In other embodiments, if necessary, multiple processors can be used together with multiple memories, and / or multiple buses can be used together with multiple memories. Similarly, multiple electronic devices can be connected (for example, as a server array, a group of blade servers, or a multi-processor system), and each device provides some necessary operations. Figure 4 A processor 301 is taken as an example.

[0078] The memory 302, as a computer-readable storage medium, can be used to store software programs, computer executable programs and modules, such as the program instructions / modules corresponding to the automobile fan air volume determination method in the embodiment of the present application (for example, the coolant circuit air volume demand determination module, the refrigerant circuit air volume demand determination module, the vehicle speed compensation air volume determination module, and the fan air volume determination module in the automobile fan air volume determination device). The processor 301 executes various functional applications and data processing of the device by running the software programs, instructions and modules stored in the memory 302, that is, realizes the above-mentioned automobile fan air volume determination method.

[0079] The memory 302 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system and at least one application required for a function; the data storage area may store data created according to the use of the terminal, etc. In addition, the memory 302 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some instances, the memory 302 may further include a memory remotely arranged relative to the processor 301, and these remote memories may be connected to the device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0080] The electronic device may further include: an input device 303 and an output device 304. The processor 301, the memory 302, the input device 303 and the output device 304 may be connected via a bus or other means. Figure 4 The example of connecting through bus is taken in the following.

[0081] The input device 303 can receive input digital or character information, and the output device 304 can include a display device, an auxiliary lighting device (e.g., LED), and a tactile feedback device (e.g., a vibration motor), etc. The display device can include, but is not limited to, a liquid crystal display (LCD), a light emitting diode (LED) display, and a plasma display. In some embodiments, the display device can be a touch screen.

[0082] Example 4 This embodiment provides a computer-readable storage medium, on which computer instructions are stored, and the computer instructions are used to enable a computer to execute the above method. The computer instructions on the computer-readable storage medium are used to enable a computer to execute the above method, and thus have at least the same advantages as the above method.

[0083] The medium in this application may adopt any combination of one or more computer-readable media. The medium may be a computer-readable signal medium or a computer-readable storage medium. The medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination thereof. More specific examples of the medium (a non-exhaustive list) include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this document, the medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, device, or device.

[0084] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, which carry computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0085] The program code contained on the computer-readable medium can be transmitted using any appropriate medium, including but not limited to wireless, wire, optical cable, RF (Radio Frequency), etc., or any suitable combination of the above.

[0086] Computer program code for performing the operation of the present application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (e.g., using an Internet service provider to connect through the Internet).

[0087] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this application can be executed in parallel, sequentially or in different orders, as long as the expected results of the technical solution disclosed in this application can be achieved, and this document is not limited here.

[0088] The above specific implementations do not constitute a limitation on the protection scope of this application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this application should be included in the protection scope of this application.

Claims

1. A method for determining the air volume of a car fan, characterized in that: include: Determine the air volume requirement of the coolant circuit according to the battery terminal temperature, motor terminal temperature and ambient temperature; Determining the refrigerant circuit air volume requirement according to the ambient temperature and a first difference; the first difference is the difference between the outlet saturation temperature and the ambient temperature, or the difference between the ambient temperature and the inlet saturation temperature; Determine the speed compensation air volume according to the vehicle speed and the vehicle air intake area; The fan air volume is determined according to the coolant circuit air volume requirement, the refrigerant circuit air volume requirement and the vehicle speed compensation air volume.

2. The method for determining the air volume of a car fan according to claim 1, characterized in that: The battery terminal temperature includes the battery average temperature and the actual battery inlet water temperature. The motor terminal temperature includes the motor body temperature, the actual motor inlet water temperature and the motor target inlet water temperature. The cooling liquid circuit air volume requirement is determined according to the battery terminal temperature, the motor terminal temperature and the ambient temperature, including: Determine the estimated heat exchange rate of the battery based on the average battery temperature and the actual battery inlet water temperature; Determine the estimated heat exchange of the motor based on the motor body temperature and the actual motor inlet water temperature; Determine the air volume requirement of the first coolant circuit according to the estimated heat exchange of the battery, the estimated heat exchange of the motor, the actual water temperature at the motor inlet, the target water temperature at the motor inlet, and the ambient temperature; Determining the air volume requirement of the second coolant circuit according to the actual inlet water temperature of the motor; The coolant circuit air volume requirement is determined according to the first coolant circuit air volume requirement and the second coolant circuit air volume requirement.

3. The method for determining the air volume of a car fan according to claim 2, characterized in that: Determining the air volume requirement of the first coolant circuit according to the estimated heat exchange of the battery, the estimated heat exchange of the motor, the actual water temperature at the motor inlet, the target water temperature at the motor inlet, and the ambient temperature includes: Determining heat dissipation according to the estimated heat exchange amount of the battery and the estimated heat exchange amount of the motor; Determine the cooling liquid circuit air volume demand compensation coefficient according to the actual motor inlet water temperature; the cooling liquid circuit air volume demand compensation coefficient is used to characterize the contribution of the actual motor inlet water temperature to the cooling liquid circuit air volume demand; The first coolant circuit air volume requirement is determined according to the heat dissipation, the coolant circuit air volume requirement compensation coefficient, the motor target inlet water temperature and the ambient temperature.

4. The method for determining the air volume of a car fan according to claim 2, characterized in that: According to the actual inlet water temperature of the motor, the air volume requirement of the second coolant circuit is determined, including: According to the actual motor inlet water temperature, querying the first database whether the actual motor inlet water temperature exists; the first database stores the standard motor actual inlet water temperature and the first standard air volume requirement corresponding to the standard motor actual inlet water temperature; When the actual inlet water temperature of the motor exists in the first database, the air volume requirement of the second coolant circuit is determined to be the first standard air volume requirement corresponding to the actual inlet water temperature of the motor; when the actual inlet water temperature of the motor does not exist in the first database, the linear interpolation method is used to determine the air volume requirement of the second coolant circuit.

5. The method for determining the air volume of a car fan according to claim 1, characterized in that: Before determining the refrigerant circuit air volume requirement according to the ambient temperature and the first difference, the method further includes: Get the working mode of the refrigerant circuit; If the working mode of the refrigerant circuit is the cooling mode, the first difference is the difference between the outlet saturation temperature and the ambient temperature; If the working mode of the refrigerant circuit is the heating mode, the first difference is the difference between the ambient temperature and the inlet saturation temperature.

6. The method for determining the air volume of a car fan according to claim 5, characterized in that: Determining the air volume requirement of the refrigerant circuit according to the ambient temperature and the first difference includes: In the case where the first difference is the difference between the outlet saturation temperature and the ambient temperature, a pre-constructed second database is obtained; the second database stores the correspondence between different first differences and ambient temperatures and different refrigerant circuit air volume requirements; The second database is queried according to the ambient temperature and the first difference to obtain the refrigerant circuit air volume requirement.

7. The method for determining the air volume of a car fan according to claim 5, characterized in that: Determining the air volume requirement of the refrigerant circuit according to the ambient temperature and the first difference includes: In the case where the first difference is the difference between the ambient temperature and the inlet saturation temperature, a pre-constructed third database is obtained; the third database stores the correspondence between different first differences and ambient temperatures and different refrigerant circuit air volume requirements; The third database is queried according to the ambient temperature and the first difference to obtain the refrigerant circuit air volume requirement.

8. A device for determining the air volume of a car fan, characterized in that: include: A coolant circuit air volume demand determination module is used to determine the coolant circuit air volume demand according to the battery terminal temperature, the motor terminal temperature and the ambient temperature; A refrigerant circuit air volume demand determination module, used to determine the refrigerant circuit air volume demand according to the ambient temperature and a first difference; the first difference is the difference between the outlet saturation temperature and the ambient temperature, or the difference between the ambient temperature and the inlet saturation temperature; A vehicle speed compensation air volume determination module is used to determine the vehicle speed compensation air volume according to the vehicle speed and the vehicle air intake area; The fan air volume determination module is used to determine the fan air volume according to the coolant circuit air volume requirement, the refrigerant circuit air volume requirement and the vehicle speed compensation air volume.

9. An electronic device, characterized in that: include: at least one processor, and a memory communicatively coupled to at least one of the processors; The memory stores instructions executable by at least one of the processors, and the instructions are executed by at least one of the processors so that the at least one processor can execute the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The medium stores computer instructions, and the computer instructions are used to enable a computer to execute the method according to any one of claims 1 to 7.

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