Method, device, electronic device and medium for determining air volume of automotive fan

Abstract

This application relates to the field of vehicle thermal management. Specifically, it relates to a method, device, electronic device and medium for determining the air volume of an automotive fan. The method includes: determining the air volume requirement of the coolant circuit according to the battery terminal temperature, the motor terminal temperature and the ambient temperature; determining the air volume requirement of the refrigerant circuit according to the ambient temperature and the 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; determining the vehicle speed compensation air volume according to the vehicle speed and the area of the vehicle air intake; determining the fan air volume according to the air volume requirement of the coolant circuit, the air volume requirement of the refrigerant circuit and the vehicle speed compensation air volume. This application can obtain a more accurate fan air volume, thereby reducing the energy consumption of the fan operation.

Description

Technical Field

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

[0002] The existing control of automotive cooling fans generally consists of two parts: a coolant circuit and a refrigerant circuit. The coolant circuit mainly determines the duty ratio for control based on component temperature or coolant temperature, and the refrigerant circuit determines the duty ratio for control based on the outlet pressure. However, this method can only meet the heat dissipation requirements. That is to say, the duty ratio is usually relatively large to meet the heat dissipation needs, but it cannot accurately evaluate the air volume demand for heat dissipation, and the control of the fan cannot be better matched according to the air volume demand, thus reducing the energy consumption of the fan operation.

[0003] In view of this, the present application is specifically proposed. 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 automotive fan, so as to solve the problem in the existing technology that the air volume demand for heat dissipation cannot be accurately evaluated.

[0005] To achieve the above purpose, the present application adopts the following technical solutions:

[0006] In a first aspect, the present application provides a method for determining the air volume of an automotive fan, including:

[0007] Determine the air volume demand of the coolant circuit according to the battery terminal temperature, the motor terminal temperature and the ambient temperature;

[0008] Determine the air volume demand of the refrigerant circuit according to the above ambient temperature and the first difference; the 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;

[0009] Determine the vehicle speed compensation air volume according to the vehicle speed and the automotive air intake area;

[0010] Determine the fan air volume according to the above air volume demand of the coolant circuit, the above air volume demand of the refrigerant circuit and the above vehicle speed compensation air volume.

[0011] As a further preferred technical solution, the above battery terminal temperature includes the battery average temperature and the actual battery inlet water temperature, and the above motor terminal temperature includes the motor body temperature, the actual motor inlet water temperature and the motor target inlet water temperature. Determining the air volume demand of the coolant circuit according to the battery terminal temperature, the motor terminal temperature and the ambient temperature includes:

[0012] Determine the estimated heat exchange amount of the battery according to the battery average temperature and the actual battery inlet water temperature;

[0013] Determine the estimated heat exchange capacity of the motor based on the temperature of the motor body and the actual inlet water temperature of the motor.

[0014] Determine the air volume demand of the first coolant circuit based on the above-mentioned estimated heat exchange capacity of the battery, the above-mentioned estimated heat exchange capacity of the motor, the actual inlet water temperature of the motor, the target inlet water temperature of the motor, and the ambient temperature.

[0015] Determine the air volume demand of the second coolant circuit based on the above-mentioned actual inlet water temperature of the motor.

[0016] Determine the air volume demand of the coolant circuit based on the above-mentioned air volume demand of the first coolant circuit and the above-mentioned air volume demand of the second coolant circuit.

[0017] As a further preferred technical solution, determining the air volume demand of the first coolant circuit based on the above-mentioned estimated heat exchange capacity of the battery, the above-mentioned estimated heat exchange capacity of the motor, the actual inlet water temperature of the motor, the target inlet water temperature of the motor, and the ambient temperature includes:

[0018] Determine the heat dissipation based on the above-mentioned estimated heat exchange capacity of the battery and the above-mentioned estimated heat exchange capacity of the motor.

[0019] Determine the compensation coefficient of the air volume demand of the coolant circuit based on the actual inlet water temperature of the motor; the compensation coefficient of 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.

[0020] Determine the air volume demand of the first coolant circuit based on the above-mentioned heat dissipation, the above-mentioned compensation coefficient of the air volume demand of the coolant circuit, the target inlet water temperature of the motor, and the ambient temperature.

[0021] As a further preferred technical solution, determining the air volume demand of the second coolant circuit based on the above-mentioned actual inlet water temperature of the motor includes:

[0022] Query whether the above-mentioned actual inlet water temperature of the motor exists in the first database according to the above-mentioned actual inlet water temperature of the motor; the first database stores the standard actual inlet water temperature of the motor and the first standard air volume demand corresponding to the above-mentioned standard actual inlet water temperature of the motor.

[0023] When the above-mentioned actual inlet water temperature of the motor exists in the first database, determine that the air volume demand of the second coolant circuit is the first standard air volume demand corresponding to the above-mentioned actual inlet water temperature of the motor; when the above-mentioned actual inlet water temperature of the motor does not exist in the first database, use the linear interpolation method to determine the air volume demand of the second coolant circuit.

[0024] As a further preferred technical solution, before determining the air volume demand of the refrigerant circuit according to the above-mentioned ambient temperature and the first difference, it further includes:

[0025] Obtain the working mode of the refrigerant circuit.

[0026] If the operating mode of the above refrigerant circuit is the refrigeration mode, the above first difference is the difference between the outlet saturation temperature and the ambient temperature;

[0027] If the operating mode of the above refrigerant circuit is the heating mode, the above first difference is the difference between the ambient temperature and the inlet saturation temperature.

[0028] As a further preferred technical solution, according to the above ambient temperature and the first difference, determine the air volume requirement of the refrigerant circuit, including:

[0029] In the case where the above first difference is the difference between the outlet saturation temperature and the ambient temperature, obtain a pre-constructed second database; different first differences and ambient temperatures are stored in the second database, and the corresponding relationship with different air volume requirements of the refrigerant circuit;

[0030] According to the above ambient temperature and the above first difference, query the second database to obtain the air volume requirement of the refrigerant circuit.

[0031] As a further preferred technical solution, according to the above ambient temperature and the first difference, determine the air volume requirement of the refrigerant circuit, including:

[0032] In the case where the above first difference is the difference between the ambient temperature and the inlet saturation temperature, obtain a pre-constructed third database; different first differences and ambient temperatures are stored in the third database, and the corresponding relationship with different air volume requirements of the refrigerant circuit;

[0033] According to the above ambient temperature and the above first difference, query the third database to obtain the air volume requirement of the refrigerant circuit.

[0034] In a second aspect, the present application provides an automotive fan air volume determination device, including:

[0035] A coolant circuit air volume requirement determination module, configured to determine the coolant circuit air volume requirement according to the battery terminal temperature, the motor terminal temperature, and the ambient temperature;

[0036] A refrigerant circuit air volume requirement determination module, configured to 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;

[0037] A vehicle speed compensation air volume determination module, configured to determine the vehicle speed compensation air volume according to the vehicle speed and the automotive air intake area;

[0038] A fan air volume determination module, configured to determine the fan air volume according to the above coolant circuit air volume requirement, the above refrigerant circuit air volume requirement, and the above vehicle speed compensation air volume.

[0039] In a third aspect, the present application provides an electronic device, including:

[0040] at least one processor, and a memory communicatively connected to at least one of the above-mentioned processors;

[0041] Wherein, the above-mentioned memory stores instructions executable by at least one of the above-mentioned processors, and the above-mentioned instructions are executed by at least one of the above-mentioned processors, so that at least one of the above-mentioned processors can execute the above-mentioned method.

[0042] In a fourth aspect, the present application provides a computer-readable storage medium, on which computer instructions are stored, and the above-mentioned computer instructions are used to cause a computer to execute the above-mentioned method.

[0043] Compared with the prior art, the beneficial effects of the present application are:

[0044] The method for determining the air volume of an automotive fan provided by the present application determines the air volume requirement of the coolant circuit according to the battery terminal temperature, the motor terminal temperature, and the ambient temperature; determines the air volume requirement of the refrigerant circuit according to the ambient temperature and the first difference; determines the vehicle speed compensation air volume according to the vehicle speed and the automotive air intake area; and finally determines the fan air volume according to the above-mentioned air volume requirement of the coolant circuit, the above-mentioned air volume requirement of the refrigerant circuit, and the above-mentioned vehicle speed compensation air volume. This method determines the air volume requirement of the coolant circuit, the air volume requirement of the refrigerant circuit, and the vehicle speed compensation air volume through specific parameters. These parameters have a high correlation with the corresponding air volume requirements or vehicle speed compensation air volume and are easy to obtain. Therefore, the air volume requirements of each circuit can be accurately known, and then the fan air volume is associated with the air volume requirement of the coolant circuit, the air volume requirement of the refrigerant circuit, 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.

[0045] Furthermore, the present application respectively uses 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 uses the method of 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 compared to the duty ratio obtained by the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0047] Figure 1 is a flowchart of the method for determining the air volume of an automotive fan provided by the present application;

[0048] Figure 2 is a schematic diagram of the principle of an automotive thermal management system;

[0049] Figure 3 is a schematic structural diagram of the automotive fan air volume determination device provided by this application;

[0050] Figure 4 is a schematic structural diagram of the electronic device provided by this application. Detailed implementation manners

[0051] The following makes an explanation of exemplary embodiments of this application in conjunction with the accompanying drawings. Various details of the embodiments of this application are included to facilitate understanding, and they should be considered merely exemplary. Therefore, those of ordinary skill in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this application. Similarly, for the sake of clarity and conciseness, the description of well-known functions and structures is omitted below.

[0052] As mentioned in the background art, the prior art has the problem that it is unable to accurately evaluate the air volume requirement for heat dissipation. In this regard, this application determines the fan air volume based on the air volume requirement of the coolant circuit, the air volume requirement of the refrigerant circuit, and the vehicle speed compensation air volume. The following further elaborates on this application in conjunction with embodiments.

[0053] Embodiment 1

[0054] Figure 1 is a flowchart of a method for determining the air volume of an automotive fan provided in this embodiment. This method can be executed by an automotive fan air volume determination device, which can be composed of software and / or hardware and is generally integrated in an electronic device. This electronic device can be an ECU (Electronic Control Unit) or a VCU (Vehicle Control Unit). For the convenience of understanding, each step in the method of this embodiment takes the VCU as the execution entity.

[0055] As Figure 1 shown, this embodiment provides a method for determining the air volume of an automotive fan, including the following steps:

[0056] S110. Determine the air volume requirement of the coolant circuit according to the battery terminal temperature, the motor terminal temperature, and the ambient temperature.

[0057] First, it should be noted that the order between steps S110 - S130 in this embodiment is only an example. In fact, the three steps can be carried out simultaneously or in a different order, as long as they are executed before S140. It should also be noted that the parameters involved in this embodiment change with time, so the parameters are continuously collected in real time. Each time the parameters are collected, a fan air volume is obtained according to the method of this embodiment, and then it can be applied to the control of the fan air volume.

[0058] Among them, the "battery end temperature" refers to the temperature related to the heat dissipation of the vehicle's power battery, including but not limited to the average battery temperature, the actual inlet water temperature of the battery, the actual outlet water temperature of the battery, etc. The "motor end temperature" refers to the temperature related to the heat dissipation of the motor, including but not limited to the motor body temperature, the actual inlet water temperature of the motor, the target inlet water temperature of the motor, the actual outlet water temperature of the motor, etc. The "average battery temperature" refers to the average temperature of the in-vehicle power battery. Since the in-vehicle power battery usually consists of multiple battery packs, it is more convenient to use the average temperature to determine the required air volume for its cooling. The "actual inlet water temperature of the battery" refers to the actual water temperature at the battery inlet in the coolant circuit. The "motor body" includes the front-drive motor body and the rear-drive motor body. Under the same circuit, the temperatures of the front-drive motor body and the rear-drive motor body are related to their own working states. 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 temperatures of the front-drive motor and the rear-drive motor are basically the same. Therefore, they are uniformly represented by the "actual inlet water temperature of the motor", which represents the actual water temperature at the motor inlet in the coolant circuit. The "ambient temperature" refers to the temperature of the external environment where the vehicle is located. All the above temperatures can be collected by temperature sensors. The "target inlet water temperature of the motor" refers to the target water temperature at the motor inlet in the coolant circuit set in advance, and this target water temperature varies according to whether the motor circuit is in the heat dissipation mode or the heat preservation mode.

[0059] In this embodiment, the fan is installed at the rear end of the low-temperature radiator and is located at the front end of the whole vehicle. Its function is forced air cooling. By introducing air, it accelerates the heat dissipation of the low-temperature radiator and effectively reduces the temperature of the cooling pipes of the components connected to the low-temperature radiator.

[0060] As Figure 2 shown, the "coolant circuit" refers to the circuit that flows through the component cooling water pipes, such as the circuit composed of a low-temperature radiator, a battery, a battery water pump, a multi-way valve, an electric drive water pump, a rear-drive motor, and a front-drive motor. It is a circuit composed of cooling water pipes and components. The "refrigerant circuit" mainly refers to the refrigerant circulation path in the vehicle air conditioning system, which is mainly composed of a compressor, an in-vehicle condenser, a refrigeration solenoid valve, a refrigeration electronic expansion valve, an in-vehicle evaporator, and the pipes connecting these components. The vehicle thermal management system includes a coolant circuit and a refrigerant circuit, and the refrigerant circuit includes a refrigerant refrigeration circuit and a refrigerant heating circuit. Figure 2The above-mentioned respective circuits are shown. In the coolant circuit, the coolant sequentially 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 the refrigerant refrigeration circuit, the refrigerant sequentially flows through the refrigeration electronic expansion valve, the in-vehicle evaporator, the compressor, the refrigeration solenoid valve, and the out-of-vehicle condenser; in the refrigerant heating circuit, the refrigerant sequentially flows through the heating electronic expansion valve, the out-of-vehicle condenser, the heating solenoid valve, the compressor, and the in-vehicle condenser.

[0061] In an alternative embodiment, the above-mentioned battery terminal temperature includes the battery average temperature and the actual battery inlet water temperature, the above-mentioned motor terminal temperature includes the motor body temperature, the actual motor inlet water temperature, and the target motor inlet water temperature. Determining the air volume demand of the coolant circuit according to the battery terminal temperature, the motor terminal temperature, and the ambient temperature includes:

[0062] Determine the estimated heat exchange quantity of the battery according to the battery average temperature and the actual battery inlet water temperature;

[0063] Determine the estimated heat exchange quantity of the motor according to the motor body temperature and the actual motor inlet water temperature;

[0064] Determine the first coolant circuit air volume demand according to the above-mentioned estimated battery heat exchange quantity, the above-mentioned estimated motor heat exchange quantity, the actual motor inlet water temperature, the target motor inlet water temperature, and the ambient temperature;

[0065] Determine the second coolant circuit air volume demand according to the above-mentioned actual motor inlet water temperature;

[0066] Determine the coolant circuit air volume demand according to the above-mentioned first coolant circuit air volume demand and the above-mentioned second coolant circuit air volume demand.

[0067] In this embodiment, the coolant circuit air volume demand is decomposed into the first coolant circuit air volume demand and the second coolant circuit air volume demand. By respectively using specific methods to determine the first coolant circuit air volume demand and the second coolant circuit air volume demand, the coolant circuit air volume demand can be obtained. Among them, the first coolant circuit air volume demand is obtained based on the energy algorithm at different temperatures, and the second coolant circuit air volume demand is obtained based on the temperature algorithm of the actual motor inlet water temperature. Compared with only obtaining the corresponding duty ratio by looking up the 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.

[0068] It should be noted that the coolant circuits of actual vehicles include two types, namely the motor circuit and the series connection of the motor circuit and the battery circuit. In the case where the coolant circuit type is the motor circuit, there is actually no "actual inlet water temperature of the battery", so this water temperature can be determined to be 0, and thus the estimated heat exchange amount of the battery is 0. Therefore, in another alternative implementation, the determination of the air volume requirement of the coolant circuit according to the battery terminal temperature, the motor terminal temperature, and the ambient temperature can also be: judge the type of the coolant circuit; in the case where the type of the coolant circuit is the motor circuit, determine the air volume requirement of the coolant circuit according to the temperature of the front drive motor body, the temperature of the rear drive motor body, and the actual inlet water temperature of the motor; in the case where the type of the coolant circuit is the series connection of the motor circuit and the battery circuit, determine the air volume requirement of the coolant circuit according to the average battery temperature, the actual inlet water temperature of the battery, the temperature of the front drive motor body, the temperature of the rear drive motor body, and the actual inlet water temperature of the motor. This implementation is substantially the same as the previous implementation, except for a slight difference in form.

[0069] Optionally, the estimated heat exchange amount of the battery is calculated by the following formula: Estimated heat exchange amount of the battery = (Average battery temperature - Actual inlet water temperature of the battery) / Battery thermal resistance coefficient. The battery thermal resistance coefficient can be obtained by testing with a professional thermal resistance testing instrument (the principle is to arrange a separate heating source and temperature sensors, and calculate the thermal resistance of the object based on the temperature change of the object and these data).

[0070] Since the faster the fluid velocity, the smaller the thermal resistance, the battery thermal resistance coefficient needs to be corrected according to the battery water flow requirement, and the method is to look up a one-dimensional table. The specific method is as follows: Test the thermal resistance (obtained by testing with a thermal resistance instrument) under different duty ratios of the water pump (10% - 100% corresponds to the water pump stopping to full speed operation) by segments, and then record it. Finally, obtain the corresponding thermal resistance coefficient by looking up the duty ratio of the water pump in the table. Table 1 shows the relationship table between the duty ratio of the water pump and the thermal resistance coefficient.

[0071] Table 1 Relationship Table between Duty Ratio of Water Pump and Thermal Resistance Coefficient

[0072]

[0073] Table 1 is calibrated in the following way: Test the thermal resistance (obtained by testing with a thermal resistance instrument) under different duty ratios of the water pump (10 - 100% corresponds to the water pump stopping to full speed operation) by segments, and then record it. The corresponding thermal resistance coefficient can be obtained by looking up the duty ratio of the water pump in Table 1.

[0074] Optionally, the estimated heat exchange amount of the motor is calculated by the following formula:

[0075] . Here, the thermal resistance coefficients of the front drive motor and the rear drive motor are obtained in a similar way to the battery thermal resistance coefficient, and will not be elaborated here.

[0076] Optionally, as described above, since parameters such as temperature are collected in real time, there may be some abnormal fluctuations in the temperature curve. At this time, first-order lag filtering processing is required to improve the reliability of the data.

[0077] In an alternative embodiment, according to the above-mentioned estimated heat exchange amount of the battery, the above-mentioned 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, determine the air volume demand of the first coolant circuit, including:

[0078] Determine the heat dissipation amount according to the above-mentioned estimated heat exchange amount of the battery and the above-mentioned estimated heat exchange amount of the motor;

[0079] Determine the air volume demand compensation coefficient of the coolant circuit according to the actual inlet water temperature of the motor; the air volume demand compensation coefficient 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;

[0080] Determine the air volume demand of the first coolant circuit according to the above-mentioned heat dissipation amount, the above-mentioned air volume demand compensation coefficient of the coolant circuit, the target inlet water temperature of the motor, and the ambient temperature.

[0081] Optionally, the heat dissipation amount = the estimated heat exchange amount of the battery + the estimated heat exchange amount of the motor.

[0082] As shown in Table 2, it is a relationship table between the actual inlet temperature of the motor and the air volume demand compensation coefficient of the coolant circuit. Optionally, the air volume demand compensation coefficient of the coolant circuit is determined by Table 2, where T1 is the highest motor circuit water temperature in the 38°C heat balance test of the vehicle. When the actual inlet water temperature of the motor 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 by linear interpolation.

[0083] Table 2 Relationship table between the actual inlet temperature of the motor and the air volume demand compensation coefficient of the coolant circuit

[0084]

[0085] Exemplarily, if the actual inlet temperature of the motor is T1, the air volume demand compensation coefficient of the coolant circuit is 20%. If the actual inlet water temperature of the motor is T1 - 5°C, the air volume demand compensation coefficient of the coolant circuit is 10%.

[0086] Optionally, the air volume demand of the first coolant circuit can be calculated by the following formula:

[0087] 。

[0088] Wherein, the unit of the heat dissipation amount is W, the unit of the temperature is °C, the air density is taken as 1.05 - 1.2 kg / m³, and the specific heat capacity at constant pressure of the air is taken 。

[0089] In an alternative embodiment, determining the air volume requirement of the second coolant circuit according to the actual inlet water temperature of the motor described above includes:

[0090] According to the actual inlet water temperature of the motor described above, query whether the actual inlet water temperature of the motor exists in the first database; 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;

[0091] When the actual inlet water temperature of the motor exists in the first database, determine that the air volume requirement of the second coolant circuit is 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, use the linear interpolation method to determine the air volume requirement of the second coolant circuit.

[0092] Among them, the "standard actual inlet water temperature of the motor" refers to the water temperature at the actual inlet of the motor used during simulation or calibration tests. The "first standard air volume requirement" refers to the air volume requirement obtained during simulation or calibration tests.

[0093] Optionally, the first database is as shown in Table 3:

[0094] Table 3 First Database

[0095]

[0096] Exemplarily, if the actual inlet water temperature of the motor is 60 °C and it is found that the actual inlet water temperature of the motor exists in the first database after querying, then determine that the air volume requirement of the second coolant circuit is 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 it is found that the actual inlet water temperature of the motor does not exist in the first database after querying, then use the linear interpolation method to determine that the air volume requirement of the second coolant circuit is (F3 - F2) / 2 + F2.

[0097] Optionally, the first database is constructed in the following manner:

[0098] Define that the first air volume requirement when the standard actual inlet water temperature of the motor is less than or equal to the standard motor heat dissipation temperature point is 0;

[0099] Collect the second air volume requirement when the standard actual inlet water temperature of the motor is the derating point in the thermal simulation test;

[0100] According to the first air volume requirement and the second air volume requirement, determine the air volume requirements at other temperature points, and the other temperature points are the temperature points between the heat dissipation temperature point and the derating point.

[0101] Among them, the thermal simulation test can be a 38°C thermal equilibrium simulation test.

[0102] The above-mentioned first database can be obtained by a calibration method. The calibration method is as follows: Start looking up the table from the water temperature that the motor actually needs to dissipate heat and within the temperature range above the highest water temperature point in the 38°C thermal equilibrium test. When the temperature is lower than the component heat dissipation temperature point, the air volume requirement is 0. When reaching the starting derating point (after the derating point, the operation of the components is unfavorable to the parts, so the derating point is the highest temperature point for the normal operation of the components), the air volume requirement is replaced by the air volume simulated by the thermal simulation model. The air volume requirements for other intermediate temperature points are calculated using the linear interpolation method.

[0103] S120. Determine the refrigerant circuit air volume requirement according to 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.

[0104] Among them, the "outlet saturation temperature" refers to the saturation temperature corresponding to the compressor outlet pressure. The "inlet saturation temperature" refers to the saturation temperature corresponding to the compressor inlet pressure. The above outlet pressure or inlet pressure is collected by a pressure sensor.

[0105] In an alternative embodiment, before determining the refrigerant circuit air volume requirement according to the ambient temperature and the first difference, it further includes:

[0106] Obtain the working mode of the refrigerant circuit;

[0107] If the working mode of the refrigerant circuit is the refrigeration mode, then the first difference is the difference between the outlet saturation temperature and the ambient temperature;

[0108] If the working mode of the refrigerant circuit is the heating mode, then the first difference is the difference between the ambient temperature and the inlet saturation temperature.

[0109] This embodiment first obtains the working mode of the refrigerant circuit, and different values are used for the first difference in different working modes, thereby improving the accuracy of the first difference.

[0110] In an alternative embodiment, determining the refrigerant circuit air volume requirement according to the ambient temperature and the first difference includes:

[0111] In the case where the first difference is the difference between the outlet saturation temperature and the ambient temperature, obtain a pre-constructed second database; different first differences and ambient temperatures are stored in the second database, and the corresponding relationship with different refrigerant circuit air volume requirements;

[0112] Query the second database according to the ambient temperature and the first difference to obtain the refrigerant circuit air volume requirement.

[0113] The above-mentioned second database is constructed when the working mode of the refrigerant circuit is the refrigeration mode. Optionally, the second database is constructed in the following manner:

[0114] Obtain the first difference at the start of the first calibration test;

[0115] Collect the first refrigerant circuit air volume when the first difference is stable and reaches a preset first difference under different test ambient temperatures and different test compressor speeds;

[0116] Use the above-mentioned test ambient temperature as the standard ambient temperature, the first difference at the start of the above-mentioned calibration test as the standard first difference, and the above-mentioned first refrigerant circuit air volume as the second standard air volume demand to construct the second database.

[0117] The above-mentioned "first calibration test" refers to the calibration test when the air conditioner working mode is the refrigeration mode.

[0118] During the process of constructing the second database, different test ambient temperatures can be 16 - 40 °C, different test compressor speeds can be 1000 - 8000 rpm, with each 1000 rpm as a test point, and the preset first difference is 10 - 20 °C.

[0119] The above-mentioned second database can be obtained through a calibration method, and the calibration method is as follows:

[0120] When the working mode of the refrigerant circuit is the refrigeration mode, heat needs to be released to the environment, and the difference between the outlet saturation temperature and the ambient temperature is usually appropriately around 10 - 20 °C. Therefore, the required air volume is calibrated according to this difference range. The calibration principle is to turn on the working mode of the refrigerant circuit as the refrigeration mode to calibrate a fixed compressor speed (1000 - 8000 rpm) at different ambient temperatures (16 - 40 °C), with each 1000 rpm as a test point. After the difference between the outlet saturation temperature and the ambient temperature is stable, then calibrate the air volume demand of the refrigerant circuit. Collect the observed data, calculate whether the difference between the outlet saturation temperature and the ambient temperature is within 10 - 20 degrees Celsius. If it is not within this range, adjust the calibration of 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 requirement, finally record the difference between the outlet saturation temperature and the ambient temperature at the start of the current 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.

[0121] In an alternative embodiment, determining the refrigerant circuit air volume demand according to the ambient temperature and the first difference includes:

[0122] When the first difference is the difference between the ambient temperature and the inlet saturation temperature, obtain a pre-constructed third database; different first differences, ambient temperatures, and corresponding relationships with different refrigerant circuit air volume requirements are stored in the third database.

[0123] According to the ambient temperature and the first difference, query the third database to obtain the refrigerant circuit air volume requirement.

[0124] The above-mentioned third database is constructed under the heating mode of the refrigerant circuit. Optionally, the third database is constructed in the following manner:

[0125] Obtain the first difference at the start of the second calibration test.

[0126] Collect the second refrigerant circuit air volume when the first difference is stable and reaches a preset first difference under different test ambient temperatures and different test compressor speeds.

[0127] Take the above-mentioned test ambient temperature as the standard ambient temperature, the first difference at the start of the calibration test as the standard first difference, and the above-mentioned second refrigerant circuit air volume as the third standard air volume requirement to construct the third database.

[0128] The "second calibration test" refers to the calibration test under the heating mode of the air conditioner.

[0129] During the process of constructing the third database, different test ambient temperatures can be -25~16°C, different test compressor speeds can be 1000~8000 rpm, with each 1000 rpm as a test point, and the preset first difference is 10~20°C.

[0130] The above-mentioned third database can be obtained through a calibration method. The calibration method is as follows:

[0131] When the working mode of the refrigerant circuit is the heating mode, heat needs to be absorbed from the environment, and the ambient temperature and the inlet saturation temperature are usually more suitable at about 10 - 20°C. The calibration principle is to calibrate a fixed compressor speed (1000 - 8000 rpm) with each 1000 rpm as a test point under different ambient temperatures (-25 - 16°C) when the working mode of the refrigerant circuit is the heating mode. After the difference between the ambient temperature and the inlet saturation temperature is stable, then calibrate the air volume requirement of the refrigerant circuit. Collect and observe data, calculate whether the difference between the ambient temperature and the inlet saturation temperature is within 10 - 20 degrees Celsius. If it is not within this range, adjust the calibration of the air volume requirement of the refrigerant circuit until the temperature difference meets the range requirement of 10 - 20°C. After the temperature difference meets the requirement, finally record the difference between the ambient temperature and the inlet saturation temperature at the start of the current test, the ambient temperature value, and the calibrated air volume requirement value when the temperature difference is met, so as to obtain the third database.

[0132] The above second database and third database are constructed using the relevant data of the calibration test. At the beginning of the calibration test, there is a specific value of a first difference. As the test progresses, the specific value of this 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. Therefore, it is determined as the corresponding standard air volume. If during the test, the specific value of this first difference first stabilizes near a value but does not reach the preset first difference, then it is necessary to adjust the air volume in the refrigerant circuit so that the first difference reaches the preset first difference, and determine the air volume at this time as the corresponding standard air volume.

[0133] S130. Determine the vehicle speed compensation air volume according to the vehicle speed and the area of the vehicle air inlet.

[0134] Optionally, the vehicle speed compensation air volume is calculated by the following formula: vehicle speed compensation air volume = vehicle speed * vehicle air inlet area * air density. Similar to the aforementioned temperature parameters, the vehicle speed is also preferably filtered.

[0135] S140. Determine the fan air volume according to the above coolant circuit air volume demand, the above refrigerant circuit air volume demand, and the above vehicle speed compensation air volume.

[0136] Optionally, the fan air volume is calculated by the following formula: fan air volume = max(coolant circuit air volume demand, refrigerant circuit air volume demand) - vehicle speed compensation air volume.

[0137] The above method for determining the vehicle fan air volume determines the coolant circuit air volume demand according to the battery end temperature, the motor end temperature, and the ambient temperature; determines the refrigerant circuit air volume demand according to the ambient temperature and the first difference; determines the vehicle speed compensation air volume according to the vehicle speed and the area of the vehicle air inlet; and finally determines the fan air volume according to the above coolant circuit air volume demand, the above refrigerant circuit air volume demand, and the above vehicle speed compensation air volume. This method determines the coolant circuit air volume demand, the refrigerant circuit air volume demand, and the vehicle speed compensation air volume through specific parameters. These parameters have a high correlation with the corresponding air volume demand or vehicle speed compensation air volume and are easy to obtain. Therefore, the air volume demand of each circuit can be accurately known, and then the fan air volume is associated with the coolant circuit air volume demand, the refrigerant circuit air volume demand, 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.

[0138] Furthermore, the present application respectively uses an energy algorithm based on different temperatures and a temperature algorithm based on the actual inlet water temperature of the motor to determine the coolant circuit air volume demand, and uses a method based on the first difference and querying the corresponding database to determine the refrigerant circuit air volume demand. Compared with the prior art for obtaining the corresponding duty ratio, it is more accurate and reliable.

[0139] In an alternative embodiment, after determining the fan air volume according to the above-mentioned coolant circuit air volume demand, the refrigerant circuit air volume demand, and the vehicle speed compensation air volume, the following steps are further included:

[0140] In response to the fan enabling state changing to not working, it is determined that the fan air volume remains the same as the last air volume before the enabling state change within a preset time.

[0141] This embodiment can avoid frequent start and stop of the fan. The above-mentioned "preset time" is, for example, 10 - 15 s.

[0142] Optionally, during the fan control process, an air intake volume table for different duty cycles of the fan can be obtained. The fan duty cycle control target corresponding to the fan air volume obtained by the above method can be obtained by looking up the table, so as to control the fan air output.

[0143] Embodiment 2

[0144] As Figure 3 shown, this embodiment provides an automotive fan air volume determination device, including:

[0145] A coolant circuit air volume demand determination module 201, configured to determine the coolant circuit air volume demand according to the battery terminal temperature, the motor terminal temperature, and the ambient temperature;

[0146] A refrigerant circuit air volume demand determination module 202, configured to determine the refrigerant circuit air volume demand according to the above-mentioned ambient temperature and the 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;

[0147] A vehicle speed compensation air volume determination module 203, configured to determine the vehicle speed compensation air volume according to the vehicle speed and the automotive air intake area;

[0148] A fan air volume determination module 204, configured to determine the fan air volume according to the above-mentioned coolant circuit air volume demand, the above-mentioned refrigerant circuit air volume demand, and the above-mentioned vehicle speed compensation air volume.

[0149] This device is used to execute the above method, and thus has at least corresponding functional modules and beneficial effects to the above method.

[0150] Embodiment 3

[0151] As Figure 4 shown, this embodiment provides an electronic device, including:

[0152] At least one processor; and

[0153] A memory communicatively connected to at least one of the above processors; wherein,

[0154] The above-mentioned memory stores instructions that can be executed by at least one of the above-mentioned processors. The above-mentioned instructions are executed by at least one of the above-mentioned processors so that at least one of the above-mentioned processors can execute the above-mentioned method. At least one processor in the electronic device can execute the above-mentioned method, and thus has at least the same advantages as the above-mentioned method.

[0155] Optionally, the electronic device further includes an interface for connecting various components, including a high-speed interface and a low-speed interface. Each component is interconnected using different buses and can be mounted on a common motherboard or otherwise installed as required. The processor can process instructions executed within the electronic device, including instructions for storing graphical information in the memory or on the memory to display a GUI (Graphical User Interface) on an external input / output device (such as a display device coupled to the interface). In other embodiments, if needed, 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 set of blade servers, or a multi-processor system), and each device provides part of the necessary operations. Figure 4 Take a processor 301 as an example.

[0156] The memory 302, as a computer-readable storage medium, can be used to store software programs, computer-executable programs, and modules, such as program instructions / modules corresponding to the method for determining the air volume of an automotive fan in the embodiments 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 automotive 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, implements the above-mentioned method for determining the air volume of an automotive fan.

[0157] The memory 302 mainly includes a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function; the data storage area can store data created according to the use of the terminal, etc. In addition, the memory 302 can include high-speed random access memory and can also include non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage devices. In some instances, the memory 302 can further include a memory remotely set relative to the processor 301, and these remote memories can be connected to the device through a network. Examples of the above-mentioned network include but are not limited to the Internet, an enterprise intranet, a local area network, a mobile communication network, and combinations thereof.

[0158] 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 by a bus or other means. Figure 4 Taking the connection through the bus as an example.

[0159] The input device 303 can receive input digital or character information. The output device 304 may include a display device, an auxiliary lighting device (e.g., an LED), a tactile feedback device (e.g., a vibration motor), etc. The display device may 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 may be a touch screen.

[0160] Example 4

[0161] This embodiment provides a computer-readable storage medium, on which computer instructions are stored. The computer instructions are used to cause a computer to execute the above method. The computer instructions on the computer-readable storage medium are used to cause a computer to execute the above method, and thus have at least the same advantages as the above method.

[0162] 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, apparatus, or device, or any combination of the above. More specific examples of the medium (a non-exhaustive list) include: an electrical connection having 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 of the above. In this document, the medium may be any tangible medium that contains or stores a program, and the program can be used by or in combination with an instruction execution system, apparatus, or device.

[0163] The computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, in which computer-readable program code is carried. Such a propagated data signal may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. The computer-readable signal medium may also be any computer-readable medium other than the computer-readable storage medium, and the computer-readable medium can send, propagate, or transmit a program for use by or in combination with an instruction execution system, apparatus, or device.

[0164] The program code contained on a computer-readable medium can be transmitted using any suitable medium, including but not limited to wireless, wire, optical fiber cable, RF (Radio Frequency), etc., or any suitable combination of the above.

[0165] The computer program code for performing the operations of the present application can be written in one or more programming languages or combinations thereof. The programming languages include object-oriented programming languages such as Java, Smalltalk, C++, and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, executed as a stand-alone 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, it can be connected to an external computer (for example, by using an Internet service provider to connect through the Internet).

[0166] It should be understood that the various forms of the flow shown above can be used, with steps reordered, added, or deleted. For example, the steps recited in the present application can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions disclosed in the present application can be achieved, and no limitations are imposed herein.

[0167] The above specific embodiments do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present application shall be included within the protection scope of the present application.

Claims

1. A method for determining the air volume of a car fan, characterized in that: include: Determine the cooling liquid circuit air volume requirement according to the battery terminal temperature, the motor terminal temperature and the ambient temperature; wherein the battery terminal temperature includes the battery average 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; determine the battery estimated heat exchange according to the battery average temperature and the actual battery inlet water temperature; determine the motor estimated heat exchange according to the motor body temperature and the actual motor inlet water temperature; determine the first cooling liquid circuit air volume requirement according to the battery estimated heat exchange, the motor estimated heat exchange, the motor actual inlet water temperature, the motor target inlet water temperature and the ambient temperature; determine the second cooling liquid circuit air volume requirement according to the actual motor inlet water temperature; determine the cooling liquid circuit air volume requirement according to the first cooling liquid circuit air volume requirement and the second cooling liquid circuit air volume requirement; 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: 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.

3. The method for determining the air volume of a car fan according to claim 1, 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.

4. 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.

5. The method for determining the air volume of a car fan according to claim 4, 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.

6. The method for determining the air volume of a car fan according to claim 4, 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.

7. A device for determining the air volume of a car fan, characterized in that: include: A module for determining the air volume requirement of a coolant circuit is used to determine the air volume requirement of a coolant circuit according to the battery terminal temperature, the motor terminal temperature and the ambient temperature; wherein 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 estimated heat exchange of the battery is determined according to the average battery temperature and the actual battery inlet water temperature; the estimated heat exchange of the motor is determined according to the motor body temperature and the actual motor inlet water temperature; the first coolant circuit air volume requirement is determined according to the estimated battery heat exchange, the estimated motor heat exchange, the actual motor inlet water temperature, the target motor inlet water temperature and the ambient temperature; the second coolant circuit air volume requirement is determined according to the actual motor inlet water temperature; 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; 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.

8. 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 6.

9. 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 6.

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