Automobile cooling fan control method and device and automobile

Abstract

The embodiment of the invention provides an automobile cooling fan control method and device and a vehicle, and relates to the technical field of automobile cooling fan control, after it is judged that a whole vehicle is in a high-voltage or charging state, engine water temperature correction is carried out based on the current driving environment and vehicle state parameters, and a first duty ratio is obtained; air conditioner temperature correction is conducted based on the current vehicle speed and the air conditioner operation condition, and a second duty ratio is obtained; based on the current vehicle speed and the temperature condition of the preset part, temperature correction is conducted on other parts, and a third duty ratio is obtained; and taking the maximum value in the corrected duty ratio as a target duty ratio for controlling the operation of the cooling fan. According to correction of temperature angles of different parts, comprehensive heat dissipation considerations are obtained, and after the heat dissipation considerations are weighed and selected, the control precision of the automobile heat dissipation fan is higher, and the service life of the automobile parts can be prolonged.

Description

[Technical field]

[0001] The embodiments of the present application relate to the technical field of automobile cooling fan control, and more particularly to an automobile cooling fan control method, device and vehicle. [Background technology]

[0002] At present, most of the control of automobile cooling fans simply obtains the temperature information of the device to be cooled, and then converts the temperature information and the engine water pump opening to calculate the cooling fan speed for duty cycle control. When the engine is equipped with a mechanical water pump, the fan control accuracy is affected and the cooling effect is not ideal. In fact, as the operating environment and operating conditions change, the capacity of the cooling fan also changes. Therefore, it is necessary to optimize the control strategy of the cooling fan to match the vehicle's operating conditions and environment. [Summary of the invention]

[0003] The embodiments of the present application propose a method, device and vehicle for controlling an automobile cooling fan, which relate to the technical field of automobile cooling fan control and can optimize automobile fan control and improve the stability of fan control when the vehicle operating conditions change.

[0004] In a first aspect, an embodiment of the present application provides a method for controlling a cooling fan of an automobile, the method comprising:

[0005] Determine the vehicle power supply mode;

[0006] After determining that the vehicle is in an upper high voltage or charging state, the engine water temperature is corrected based on the current driving environment and vehicle state parameters to obtain a first duty cycle of the cooling fan;

[0007] Based on the current vehicle speed and the air conditioning operation status, the air conditioning temperature is corrected to obtain a second duty cycle of the cooling fan;

[0008] Based on the current vehicle speed and the temperature of the preset components, the temperature of the remaining components is corrected to obtain a third duty cycle of the cooling fan;

[0009] Taking the maximum value among the first duty cycle, the second duty cycle, and the third duty cycle to obtain a target duty cycle request value;

[0010] The cooling fan is controlled to operate based on the target duty cycle request value.

[0011] In at least one possible implementation, the engine water temperature correction based on the current driving environment and vehicle state parameters includes:

[0012] Determining a first initial duty cycle based on current engine speed and engine load;

[0013] Obtaining a pre-calibrated first correction coefficient according to the engine water temperature, the actual torque of the engine and the calculated target torque;

[0014] According to the current vehicle speed, a pre-calibrated second correction coefficient is obtained; and,

[0015] According to the multi-dimensional information of the current driving scene, a plurality of pre-calibrated third correction coefficients are obtained;

[0016] The first initial duty cycle is combined with the first correction coefficient, the second correction coefficient, and the third correction coefficient to obtain the first duty cycle.

[0017] In at least one possible implementation manner, obtaining the third duty cycle of the cooling fan includes:

[0018] A second initial duty cycle is obtained by querying a pre-calibrated comparison table based at least on the water temperature of the motor water channel and the duty cycle request value of the motor water pump;

[0019] The second initial duty cycle is combined with the second correction coefficient to obtain a third duty cycle.

[0020] In at least one possible implementation manner, the method of determining the first initial duty cycle includes:

[0021] Pre-calibrate the temperature of each engine load corresponding to different engine speed values, balance the duty cycle value within a given temperature range, and construct a comparison table;

[0022] The first initial duty cycle under the current engine operating condition is determined by looking up a comparison table using the current engine speed and engine load.

[0023] In at least one possible implementation, the control method further includes: at least detecting whether the engine or the motor or the motor controller exceeds a preset temperature threshold; if exceeded, controlling the cooling fan to operate according to a preset maximum duty cycle limit.

[0024] In at least one possible implementation, the control method further includes: after determining that the entire vehicle is in a power-off process, determining the operating state of the cooling fan according to the power-off duration and the temperature of the engine and / or preset components.

[0025] The technical effects of this scheme can be referred to as follows: after determining that the whole vehicle is in the upper high voltage or charging state, the engine water temperature is corrected based on the current driving environment and vehicle state parameters to obtain a first duty cycle; the air-conditioning temperature is corrected based on the current vehicle speed and air-conditioning operation conditions to obtain a second duty cycle; the temperature of the remaining components is corrected based on the current vehicle speed and the temperature of the preset components to obtain a third duty cycle; the maximum value of the above-mentioned corrected duty cycles is taken as the target duty cycle for controlling the operation of the cooling fan.

[0026] It can be seen that this application selects the corresponding control strategy to reasonably control the opening and closing of the cooling fan according to the current external environment information and the vehicle operating parameters, so as to reduce the temperature to a safe temperature, thereby ensuring the normal operation of various components of the vehicle and reducing unnecessary energy loss; and further through the torque deviation correction logic, it can significantly improve the stability of the cooling fan control when the vehicle working conditions change; in addition, by introducing load judgment conditions, the cooling fan can also be accurately controlled on the basis of a mechanical water pump. While improving the control accuracy of the car fan and extending the service life of the components, this application also provides a good driving experience.

[0027] In a second aspect, an embodiment of the present application provides a vehicle cooling fan control device, the device comprising:

[0028] Vehicle status detection module, used to determine the power supply mode of the whole vehicle;

[0029] A first correction module is used to correct the engine water temperature based on the current driving environment and vehicle state parameters after determining that the vehicle is in an upper high voltage or charging state, and obtain a first duty cycle of the cooling fan;

[0030] A second correction module, used to correct the air-conditioning temperature based on the current vehicle speed and the air-conditioning operation status, and obtain a second duty cycle of the cooling fan;

[0031] A third correction module, used to correct the temperature of other components based on the current vehicle speed and the temperature of preset components, to obtain a third duty cycle of the cooling fan;

[0032] a target duty cycle calculation module, configured to obtain a maximum value among the first duty cycle, the second duty cycle, and the third duty cycle to obtain a target duty cycle request value;

[0033] The cooling fan control module is used to control the operation of the cooling fan based on the target duty cycle request value.

[0034] In a third aspect, an embodiment of the present application provides an electronic device, comprising: one or more processors, a memory, and one or more computer programs, wherein the memory may adopt a non-volatile storage medium, wherein the one or more computer programs are stored in the memory, and the one or more computer programs include instructions, and when the instructions are executed by the device, the electronic device performs the method as described in the first aspect or any possible implementation manner of the first aspect.

[0035] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores a computer program. When the computer-readable storage medium is run on a computer, the computer executes the method as described in the first aspect or any possible implementation of the first aspect.

[0036] In a fifth aspect, an embodiment of the present application provides a vehicle, comprising the electronic device in the embodiment of the third aspect and the computer-readable storage medium in the embodiment of the fourth aspect.

[0037] It should be understood that the second to fifth aspects of the embodiments of the present application are consistent with the technical solutions of the first aspect of the embodiments of the present application, and the beneficial effects achieved by each aspect and the corresponding feasible implementation methods are similar and will not be repeated here.

Brief Description of the Drawings

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 A schematic flow chart of a method for controlling a cooling fan of an automobile provided in an embodiment of the present application;

[0040] Figure 2 A schematic diagram of the structure of an automobile cooling fan control device provided in an embodiment of the present application. [Specific implementation method]

[0041] In order to better understand the technical solution of this specification, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0042] It should be clear that the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this specification.

[0043] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit this specification. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0044] In view of the above-mentioned current status of cooling fan control, the embodiment of the present application provides a method for controlling a cooling fan of an automobile. In the method, a corresponding control strategy is selected according to the current external environment information and the vehicle operation parameters to reasonably control the opening and closing of the cooling fan, so that the temperature is reduced to a safe temperature, thereby ensuring the normal operation of various components of the vehicle and reducing unnecessary energy loss. While improving the control accuracy of the automobile fan and extending the service life of the components, the present application also provides a good driving experience.

[0045] The technical solution protected by the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0046] See also Figure 1 , is a flow chart of a method for controlling a car cooling fan provided by an embodiment of the present application. The flow chart of the method is described as follows:

[0047] Step S1, determining the vehicle power supply mode;

[0048] Step S2: after determining that the vehicle is in the upper high voltage or charging state, the engine water temperature is corrected based on the current driving environment and vehicle state parameters to obtain a first duty cycle of the cooling fan;

[0049] The reason for mentioning engine water temperature correction here is that it is unreliable and does not meet the actual working conditions if the cooling fan is simply controlled by water temperature and engine speed (related to the opening of the mechanical water pump) in different environments and vehicle conditions. Therefore, it is proposed to comprehensively consider the factors affecting the engine water temperature and fan control accuracy through parameters such as the sensing system, positioning system and vehicle operation data, so as to obtain the first duty cycle data for driving the electronic fan.

[0050] Specifically, the engine water temperature correction based on the current driving environment and vehicle state parameters includes:

[0051] Determining a first initial duty cycle based on current engine speed and engine load;

[0052] Obtaining a pre-calibrated first correction coefficient according to the engine water temperature, the actual torque of the engine and the calculated target torque;

[0053] According to the current vehicle speed, a pre-calibrated second correction coefficient is obtained; and,

[0054] According to the multi-dimensional information of the current driving scene, a plurality of pre-calibrated third correction coefficients are obtained;

[0055] The first initial duty cycle is combined with the first correction coefficient, the second correction coefficient, and the third correction coefficient to obtain the first duty cycle.

[0056] The above-mentioned method of obtaining the initial duty cycle can be specifically as follows: the initial duty cycle under the current starting operating condition can be determined by querying a preset comparison table (the above-mentioned vehicle state parameters can be used for calibration, for example, calibration can be carried out in the engine water temperature range of 80 to 90 degrees, and the duty cycle of the electronic fan can be adjusted so that the temperature balance corresponding to each load at different speed values ​​is between 80-90°C).

[0057] Next, based on the corresponding relationship between the engine water temperature and the difference between the actual torque and the target torque (which can also be obtained by looking up a pre-calibrated second comparison table), the engine operating condition correction coefficient γ can be obtained.

[0058] It can be pointed out that the consideration in this link is that the engine water temperature will be affected by the engine load, and the deviation between the actual engine torque and the calculated target torque will also affect the accuracy of the cooling fan control. Therefore, it is considered to introduce the engine load to obtain the initial duty cycle, and then obtain the correction coefficient γ by torque control.

[0059] The reference implementation examples for obtaining the second and third correction coefficients are as follows:

[0060] Vehicle speed correction: The vehicle speed can be calculated based on the wheel speed sensor, and the speed correction coefficient β can be obtained by looking up the comparison table;

[0061] Slope correction, one of the multi-dimensional information of the current driving scene: the slope of the vehicle can be obtained according to the slope recognition module inside the HCU, and the slope correction coefficient i can be obtained by looking up the comparison table;

[0062] Ambient temperature correction, one of the multi-dimensional information of the current driving scene: the ambient temperature can be obtained from an external sensor, and the temperature correction coefficient j can be obtained by looking up the comparison table;

[0063] Altitude correction, one of the multi-dimensional information of the current driving scene: the ambient pressure can be obtained from the external sensor, and the altitude correction coefficient k can be obtained by looking up the comparison table;

[0064] The principles of the above-mentioned correction considerations can be referred to as follows: the fan drive duty cycle can be appropriately reduced in the uphill stage of the vehicle to improve the climbing power performance of the entire vehicle; in the downhill stage, the sliding force of the entire vehicle can be used to drive the fan speed to take away the excess heat energy of the system, so the fan drive duty cycle can be appropriately reduced to save vehicle energy consumption; in addition, technical personnel in this field can understand that the higher the vehicle speed and the higher the ambient temperature, the worse the heat dissipation effect, and the more likely it is that auxiliary heat dissipation will be needed; and the lower the temperature, the better the heat dissipation effect, and the smaller the demand for auxiliary heat dissipation; similarly, the environmental pressure in low-altitude areas is greater, so when the ambient temperature is high and the altitude is low, the fan drive duty cycle can be appropriately reduced; and when the ambient temperature is low and the altitude is high, the fan drive duty cycle can be appropriately increased.

[0065] Finally, the first initial duty cycle may be multiplied by i, j, k, β, and γ to obtain a first duty cycle A of the cooling fan.

[0066] Continuing from the above, step S3, based on the current vehicle speed and the air conditioning operation status, the air conditioning temperature is corrected to obtain a second duty cycle of the cooling fan;

[0067] It can be explained that when the vehicle is powered on and is driving, creeping, or charging, if the cabin cooling is turned on or there is a battery cooling demand, in order to maintain the stable pipe pressure of the air-conditioning system at this time, the heat generated by the air-conditioning can be removed by the operation of the cooling fan to adjust the pipe pressure of the air-conditioning system. Based on this analysis, this embodiment proposes to add the relationship between the pipe pressure of the air-conditioning and the vehicle speed, and query the comparison table (which can be calibrated) to obtain the duty cycle request B for the current air-conditioning operating condition.

[0068] Step S4, based on the current vehicle speed and the temperature of the preset components, the temperature of the remaining components is corrected to obtain a third duty cycle of the cooling fan;

[0069] Regarding the temperature correction of other preset vehicle components, for example, the second initial duty cycle can be obtained by querying a pre-calibrated comparison table based on the water temperature of the motor water channel and the duty cycle request value of the motor water pump; then the second initial duty cycle value is multiplied by the vehicle speed correction coefficient β (second correction coefficient) mentioned above to obtain a third duty cycle request C, (the consideration of this link is that, according to the installation position of the cooling fan, other components that generate heat besides the engine and air conditioner can be added. Since only the motor is taken as an example in this embodiment, it can be understood that in actual operation, the third duty cycle may not be limited to one).

[0070] Step S5, taking the maximum value among the first duty cycle, the second duty cycle, and the third duty cycle to obtain a target duty cycle request value;

[0071] Step S6: controlling the operation of the cooling fan based on the target duty cycle request value.

[0072] It can also be added here that the above-mentioned use of the maximum value of the three corrected duty cycles for control is mainly for most situations. In real scenarios, other abnormal working conditions may also occur, such as overheating of components. At this time, the above scheme is not optimal. Therefore, in other preferred embodiments of the present application, it is also proposed that the control method also includes: at least detecting whether the engine and / or motor and / or motor controller exceeds a preset temperature threshold, such as engine water temperature>110°C (calibrable, hysteresis 5°C), P1 / P3 motor temperature>135°C (calibrable, hysteresis 5°C), P1&P3 motor controller temperature>85°C (calibrable, hysteresis 5°C). If any of the above situations occurs, the HCU controls the operation of the cooling fan according to the preset duty cycle upper limit of the cooling fan (that is, fixed frame control, the fan is fully open).

[0073] Finally, it can be pointed out that the above judgment on the vehicle power supply mode, in addition to high voltage or charging, can also include at least the following two types:

[0074] First, when it is determined that the vehicle is in the process of being powered off, the operating state of the cooling fan can be determined based on the duration of the power-off and the temperature of the engine and / or preset components.

[0075] For example, if the vehicle is powered off for less than 40 seconds (calibrable), and the engine water temperature is greater than 110°C (calibrable), or other components (e.g., P1 & P3 motor temperature is greater than 135°C (calibrable)), the HCU will fully open the fan according to the preset duty cycle upper limit; if the temperature of the engine and other components is not high or the vehicle is powered off for ≥40 seconds, the cooling fan can be controlled to be closed.

[0076] Second, when it is determined that the entire vehicle is not powered on, it is understandable that the HCU controls the cooling fan to turn off, which is not elaborated in this application.

[0077] See also Figure 2 Based on the same inventive concept, the embodiment of the present application also provides a vehicle cooling fan control device, the device comprising:

[0078] The vehicle status detection module 201 is used to determine the power supply mode of the vehicle;

[0079] The first correction module 202 is used to correct the engine water temperature based on the current driving environment and vehicle state parameters after determining that the vehicle is in the upper high voltage or charging state, and obtain a first duty cycle of the cooling fan;

[0080] The second correction module 203 is used to correct the air-conditioning temperature based on the current vehicle speed and the air-conditioning operation status to obtain a second duty cycle of the cooling fan;

[0081] A third correction module 204, configured to correct the temperature of other components based on the current vehicle speed and the temperature of the preset components, and obtain a third duty cycle of the cooling fan;

[0082] A target duty cycle calculation module 205 is used to obtain a maximum value among the first duty cycle, the second duty cycle, and the third duty cycle to obtain a target duty cycle request value;

[0083] The cooling fan control module 206 is used to control the operation of the cooling fan based on the target duty cycle request value.

[0084] Based on the same inventive concept, an embodiment of the present application also provides an electronic device, including at least one processor, which is used to execute a computer program stored in a memory to implement the flow chart steps of the above-mentioned automobile cooling fan control method provided in the embodiment of the present application.

[0085] Optionally, the processor may specifically be a central processing unit, a specific ASIC, or one or more integrated circuits for controlling program execution.

[0086] Optionally, the electronic device may further include a memory connected to at least one processor, and the memory may include ROM, RAM, and disk storage. The memory is used to store data required by the processor when it is running, that is, it stores instructions that can be executed by at least one processor, and at least one processor executes the methods mentioned in the above embodiments by executing the instructions stored in the memory. Among them, the number of memories is one or more. Among them, the number of memories is one or more.

[0087] An embodiment of the present application also provides a computer storage medium, wherein the computer storage medium stores computer instructions. When the computer instructions are executed on a computer, the computer executes the methods mentioned in the above embodiments.

[0088] Based on the same inventive concept, the embodiment of the present application further provides a vehicle, comprising at least the above electronic device and / or computer-readable storage medium. The selection of the vehicle can be determined based on the correct understanding and reasonable implementation of the above solution by those skilled in the art.

[0089] The above description is only a preferred embodiment of this specification and is not intended to limit this specification. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this specification should be included in the scope of protection of this specification.

Claims

1. A method for controlling a car cooling fan, characterized in that: The method comprises: Determine the vehicle power supply mode; After determining that the vehicle is in an upper high voltage or charging state, the engine water temperature is corrected based on the current driving environment and vehicle state parameters to obtain a first duty cycle of the cooling fan; Based on the current vehicle speed and the air conditioning operation status, the air conditioning temperature is corrected to obtain a second duty cycle of the cooling fan; Based on the current vehicle speed and the temperature of the preset components, the temperature of the remaining components is corrected to obtain a third duty cycle of the cooling fan; Taking the maximum value among the first duty cycle, the second duty cycle, and the third duty cycle to obtain a target duty cycle request value; The cooling fan is controlled to operate based on the target duty cycle request value.

2. The automobile cooling fan control method according to claim 1, characterized in that: The engine water temperature correction based on the current driving environment and vehicle state parameters includes: Determining a first initial duty cycle based on current engine speed and engine load; Obtaining a pre-calibrated first correction coefficient according to the engine water temperature, the actual torque of the engine and the calculated target torque; According to the current vehicle speed, a pre-calibrated second correction coefficient is obtained; and, According to the multi-dimensional information of the current driving scene, a plurality of pre-calibrated third correction coefficients are obtained; The first initial duty cycle is combined with the first correction coefficient, the second correction coefficient, and the third correction coefficient to obtain the first duty cycle.

3. The automobile cooling fan control method according to claim 2, characterized in that: The step of obtaining a third duty cycle of the cooling fan comprises: A second initial duty cycle is obtained by querying a pre-calibrated comparison table based at least on the water temperature of the motor water channel and the duty cycle request value of the motor water pump; The second initial duty cycle is combined with the second correction coefficient to obtain a third duty cycle.

4. The automobile cooling fan control method according to claim 2, characterized in that: The method of determining the first initial duty cycle includes: Pre-calibrate the temperature of each engine load corresponding to different engine speed values, balance the duty cycle value within a given temperature range, and construct a comparison table; The first initial duty cycle under the current engine operating condition is determined by looking up a comparison table using the current engine speed and engine load.

5. The automobile cooling fan control method according to claim 1, characterized in that: The control method further includes: at least detecting whether the temperature of the engine, the motor or the motor controller exceeds a preset temperature threshold; if exceeded, controlling the cooling fan to operate according to a preset maximum limit of the duty cycle.

6. The automobile cooling fan control method according to any one of claims 1 to 5, characterized in that: The control method further includes: after determining that the entire vehicle is in a power-off process, determining the operating state of the cooling fan according to the power-off duration and the temperature of the engine and / or preset components.

7. A car cooling fan control device, characterized in that: The device comprises: Vehicle status detection module, used to determine the power supply mode of the whole vehicle; A first correction module is used to correct the engine water temperature based on the current driving environment and vehicle state parameters after determining that the vehicle is in an upper high voltage or charging state, and obtain a first duty cycle of the cooling fan; A second correction module, used to correct the air-conditioning temperature based on the current vehicle speed and the air-conditioning operation status, and obtain a second duty cycle of the cooling fan; A third correction module, used to correct the temperature of other components based on the current vehicle speed and the temperature of preset components, to obtain a third duty cycle of the cooling fan; a target duty cycle calculation module, configured to obtain a maximum value among the first duty cycle, the second duty cycle, and the third duty cycle to obtain a target duty cycle request value; The cooling fan control module is used to control the operation of the cooling fan based on the target duty cycle request value.

8. An electronic device, characterized in that: include: One or more processors, a memory and one or more computer programs, wherein the one or more computer programs are stored in the memory, and the one or more computer programs include instructions, and when the instructions are executed by the electronic device, the electronic device executes the automobile cooling fan control method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the automobile cooling fan control method according to any one of claims 1 to 6 is implemented.

10. A vehicle, characterized in that: The vehicle is provided with the electronic device of claim 8 or the computer-readable storage medium of claim 9.

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