Cooling fan control method, device, electronic equipment and vehicle

Abstract

The present application is applicable to the field of vehicle cooling control technology, and provides a cooling fan control method, device, electronic equipment and vehicle, including: determining a first speed threshold of the cooling fan input speed corresponding to the maximum application operating temperature corresponding to the physical properties of the silicone oil, obtaining the input speed of the cooling fan, and if the input speed of the cooling fan is greater than or equal to the first speed threshold, reducing the output speed of the cooling fan according to the control parameter, and when the output speed of the cooling fan is less than or equal to the second speed threshold, stopping the control of the cooling fan. When the present application determines that the input speed of the cooling fan is greater than the set speed threshold, the temperature of the fan clutch silicone oil is timely reduced by reducing the output speed of the cooling fan, thereby solving the problem that the silicone oil temperature is too high and affects the cooling function of the cooling fan.

Description

Technical Field

[0001] The present application belongs to the technical field of vehicle cooling control, and in particular, relates to a cooling fan control method, device, electronic equipment and vehicle. Background Art

[0002] The silicone oil fan clutch is a cooling fan clutch that uses silicone oil as a medium and transmits torque through the shear and viscosity of silicone oil. The silicone oil fan clutch is sealed with viscous silicone oil, and the torque is transmitted by the shear and viscosity of viscous silicone oil. The silicone oil fan clutch adjusts the speed of the fan according to the pulse width modulation signal sent by the vehicle control unit. The clutch coil of the silicone oil fan generates different Lorentz magnetic forces under different pulse width signal voltages, driving the control valve stem to drive the valve plate to adjust the valve plate opening to adjust the amount of silicone oil in the clutch working area.

[0003] However, when the vehicle's engine speed is too high, the input speed of the engaged fan clutch will also be very high. At this time, there will be a large slip when the fan clutch runs at a high speed, resulting in a larger difference between the output power of the fan clutch's output speed and the input power of the input speed. Part of the input power is converted into heating power of the fan clutch, causing the temperature of the silicone oil to be too high, affecting the cooling function of the fan. Summary of the invention

[0004] The embodiments of the present application provide a cooling fan control method, device, electronic equipment and vehicle, which solve the problem that the cooling function of the cooling fan is affected by the excessively high temperature of silicone oil.

[0005] In a first aspect, an embodiment of the present application provides a cooling fan control method, the method comprising:

[0006] Determine a first speed threshold of the cooling fan input speed corresponding to a preset silicone oil temperature, wherein the preset silicone oil temperature is a maximum application operating temperature corresponding to the physical properties of the silicone oil;

[0007] Get the input speed of the cooling fan;

[0008] If the input speed is greater than or equal to the first speed threshold, reducing the output speed of the cooling fan according to the control parameter;

[0009] When the output speed is less than or equal to a second speed threshold, the cooling fan is stopped from being controlled.

[0010] In a possible implementation manner of the first aspect, determining a first speed threshold of a cooling fan input speed corresponding to a preset silicone oil temperature includes:

[0011] controlling an input speed of the cooling fan according to at least one speed parameter;

[0012] For each of the speed parameters, in the process of controlling the cooling fan to operate according to the speed parameter, obtaining a silicone oil temperature value of the cooling fan;

[0013] Obtaining a speed-temperature relationship function according to each speed parameter and the corresponding silicone oil temperature value;

[0014] A speed parameter corresponding to a preset silicone oil temperature is determined according to the speed-temperature relationship function, and the speed parameter corresponding to the preset silicone oil temperature is used as the first speed threshold.

[0015] In a possible implementation manner of the first aspect, obtaining a speed-temperature relationship function according to each speed parameter and the corresponding silicone oil temperature value includes:

[0016] For each of the speed parameters, determining a first coefficient corresponding to the speed parameter according to the speed parameter and a corresponding silicone oil temperature value;

[0017] determining a second coefficient according to a mean value of each of the first coefficients;

[0018] The rotation speed and temperature relationship function is determined according to the second coefficient.

[0019] In a possible implementation manner of the first aspect, before reducing the output speed of the cooling fan according to the control parameter, the method further includes:

[0020] Determining an engine speed threshold corresponding to the first speed threshold according to a gear train speed ratio, wherein the gear train speed ratio is a ratio between the engine speed and the input speed of the cooling fan;

[0021] Determining the engine speed threshold and the duty cycle parameter corresponding to the second speed threshold according to a vehicle pre-table, wherein the vehicle pre-table is a table containing a correspondence between the engine speed, the duty cycle parameter and the output speed of the cooling fan;

[0022] The duty cycle parameter is used as the control parameter.

[0023] In a possible implementation manner of the first aspect, reducing the output speed of the cooling fan according to the control parameter includes:

[0024] Determining a control voltage according to the duty cycle parameter;

[0025] controlling the valve opening of the silicone oil clutch according to the control voltage;

[0026] The output speed of the cooling fan is controlled according to the valve opening of the silicone oil clutch.

[0027] In a possible implementation manner of the first aspect, when the output speed is less than or equal to a second speed threshold, stopping controlling the cooling fan includes:

[0028] Obtaining the output speed of the cooling fan;

[0029] If the output speed is greater than the second speed threshold, determining a difference between the output speed and the second speed threshold;

[0030] Determining an adjustment duty cycle parameter corresponding to the difference;

[0031] Controlling the output speed of the cooling fan according to the adjusted duty cycle parameter;

[0032] If the output speed is less than or equal to the second speed threshold, the cooling fan is stopped from being controlled.

[0033] In a possible implementation manner of the first aspect, the control parameter is a proportional control parameter and / or an integral control parameter of the vehicle cooling fan.

[0034] In a second aspect, an embodiment of the present application provides a cooling fan control device, comprising:

[0035] A determination module, used to determine a first speed threshold of a cooling fan input speed corresponding to a preset silicone oil temperature, wherein the preset silicone oil temperature is a maximum application operating temperature corresponding to the physical properties of the silicone oil;

[0036] An acquisition module, used for acquiring the input speed of the cooling fan;

[0037] a control module, configured to reduce the output speed of the cooling fan according to a control parameter if the input speed is greater than or equal to the first speed threshold;

[0038] A stop module is used to stop controlling the cooling fan when the output speed is less than or equal to a second speed threshold.

[0039] In a third aspect, an embodiment of the present application provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the cooling fan control method as described in any one of the first aspects is implemented.

[0040] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and when a processor executes the computer-executable instructions, a cooling fan control method as described in any one of the first aspects is implemented.

[0041] In a fifth aspect, an embodiment of the present application provides a vehicle, comprising the electronic device as described in the fourth aspect.

[0042] It can be understood that the beneficial effects of the second to fifth aspects mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here.

[0043] Compared with the prior art, the embodiments of the present application have the following beneficial effects: when the input speed of the cooling fan is greater than or equal to the first speed threshold corresponding to the maximum application operating temperature corresponding to the physical properties of the silicone oil, the output speed of the cooling fan is reduced according to the control parameter, and when the output speed of the cooling fan is less than or equal to the second speed threshold, the cooling fan is stopped from being controlled. When the present application determines that the input speed of the cooling fan is greater than the set speed threshold, the temperature of the fan clutch silicone oil is timely reduced by reducing the output speed of the cooling fan, thereby solving the problem that the silicone oil temperature is too high and affects the cooling function of the cooling fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0045] Figure 1 is a schematic diagram of the structure of an engine system provided in an embodiment of the present application;

[0046] Figure 2 is a cross-sectional view of a fan clutch mechanism provided in an embodiment of the present application;

[0047] Figure 3 A schematic diagram of the change in silicone oil temperature during the operation of a fan provided in an embodiment of the present application;

[0048] Figure 4 A schematic diagram of power distribution during fan operation provided in an embodiment of the present application;

[0049] Figure 5 The cooling fan control method provided in the embodiment of the present application is shown in FIG. Figure 1 ;

[0050] Figure 6 is a schematic diagram of a thermal protection zone related to a rotation speed provided in an embodiment of the present application;

[0051] Figure 7 The cooling fan control method provided in the embodiment of the present application is shown in FIG. Figure 2 ;

[0052] Figure 8The cooling fan control method provided in the embodiment of the present application is shown in FIG. Figure 3 ;

[0053] Fig. 9 is a structural block diagram of a cooling fan control device provided in an embodiment of the present application;

[0054] Fig.10 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0055] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0056] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0057] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0058] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]", depending on the context.

[0059] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0060] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. appearing in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways.

[0061] See also Figure 1 , Figure 1 Schematic diagram of the engine system structure provided by the embodiment of the present application. Figure 1 As shown, the engine system provided by the embodiment of the present application includes an electronically controlled silicone oil clutch fan 101, a fan gear train 102, a fan control harness 103, an engine electronic control unit 104, an engine body 105, an engine crankshaft wheel 106, and a belt 107. Exemplarily, the electronically controlled silicone oil clutch fan 101 is installed on the engine body 105 through the fan gear train 102, and rotates with the engine crankshaft wheel 106 through the belt 107. The engine electronic control unit 104 is connected to the electronically controlled silicone oil clutch fan 101 through the fan control harness 103 to control the fan speed. The electronically controlled silicone oil clutch fan 101 is directly driven by the engine crankshaft wheel 106.

[0062] See also Figure 2 , Figure 2 2 is a cross-sectional view of a fan clutch mechanism provided in an embodiment of the present application. Figure 2 As shown, in Figure 1 In the engine system including the electronically controlled silicone oil clutch fan 101 provided, the fan clutch of the electronically controlled silicone oil clutch fan 101 provided in the embodiment of the present application includes a driving shaft 11, a coil assembly 12, a clutch rear cover 13, a clutch front cover 14, a valve plate 15, an active plate 16, a valve stem assembly 17, a stop seat 18, and a bearing 19. Figure 2 As shown, A is the working chamber of silicone oil, B and C are the paths of silicone oil, and D is the storage chamber of silicone oil. Specifically, the electronically controlled silicone oil clutch fan 101 is installed on the pulley 23 through the driving shaft 11, the coil assembly 12 is installed on the driving shaft 11 through the built-in bearing, the clutch rear cover 13 is connected to the driving shaft 11 through the bearing 19, the clutch rear cover 13 and the clutch front cover 14 are fixed together by bolts, the active plate 16 is hard connected to the driving shaft 11 through splines, and the clutch rear cover 13, the clutch front cover 14 and the active plate 16 have a labyrinth groove structure in the working chamber A that intersects each other and has a certain gap.

[0063] exist Figure 2On the basis of the fan clutch structure provided, the working process of the fan clutch of the electronically controlled silicone oil clutch fan 101 is as follows: after the vehicle is powered on and the engine is started, when the electronically controlled silicone oil clutch fan 101 is controlled to run at a high speed according to the engine cooling demand, the engine electronic control unit 104 sends a pulse width modulation signal to the coil assembly 12 through the fan control harness 103, and the coil assembly 12 generates a Lorentz force acting on the valve stem assembly 17. The valve stem assembly 17 moves forward and backward along the axial direction under the constraint of the stop seat 18, driving the valve plate 15 to move. The valve plate 15 is driven to move to form a normally closed structure with the active plate 16. When the valve plate 15 moves, a path B is formed; the silicone oil in the storage chamber D enters the working chamber A through the path B under the action of centrifugal force, that is, the labyrinth groove area formed by the active plate 16, the clutch rear cover 13 and the clutch front cover 14. The driving force is formed by cutting the silicone oil through this area, driving the clutch rear cover 13 and the clutch front cover 14 to rotate with the active plate 16. Under the action of centrifugal force, the silicone oil passes through the working chamber A and returns to the storage chamber D from the path C, forming a complete cycle. When the fan speed is not required, the engine electronic control unit 104 sends a pulse width modulation signal to the coil assembly 12 through the fan control harness 103, the valve plate 15 does not move, the valve plate 15 and the active plate 16 form a normally closed structure, and the path B is closed, so the silicone oil cannot enter the working chamber A, and the driving torque cannot be generated, and the fan runs at the lowest speed.

[0064] During the operation of the fan clutch of the electronically controlled silicone oil clutch fan 101, the electronically controlled silicone oil clutch fan 101 can also detect the actual speed of the fan blades through the Hall sensor integrated in its own coil assembly, and send a speed pulse signal to the engine electronic control unit 104 through the fan control harness 103. The engine electronic control unit 104 compares the actual fan speed with the target speed and uses PID to feedback control the fan speed. This control method through feedback generally uses PI control, PD control or PID control.

[0065] Figure 3 This is a schematic diagram of the change in silicone oil temperature during fan operation provided by the embodiment of the present application. Figure 3 As shown in FIG. 1 , when the fan input speed gradually increases, the silicone oil temperature gradually rises. When the maximum temperature of the silicone oil reaches the maximum application operating temperature Tlim corresponding to the physical properties of the silicone oil, at this time, the fan speed is Nlim and the fan input speed is Nin.

[0066] Figure 4 This is a schematic diagram of the power distribution of the fan during operation provided by the embodiment of the present application. Figure 4As shown, the input speed of the fan clutch is determined by the engine speed and its gear train speed ratio, and the output speed of the fan clutch is related to the input speed of the fan clutch. When the input-to-output speed ratio is high, that is, when the fan rotates slowly when the input speed is high, most of the input transfer power is converted into heat. But because the fan power demand is very low at low fan speeds, most of the little is still little. As the fan speed increases, the fan power increases, but the input-to-output speed ratio decreases, and the reduced part of the input power is converted into heat. When the fan speed approaches the input speed, the fan power approaches the input power. At this low input-to-output speed ratio, the power converted into heat is also small, and approaches zero as the fan clutch approaches lock.

[0067] exist Figure 4 Based on the power distribution diagram of the fan clutch of the example, the slip heat of the fan clutch is shown as formula (1):

[0068]

[0069] Among them, Q slip is the fan clutch slip thermal power, N max is the maximum input speed without slip, N slip is the maximum output speed when there is no slip. Figure 4 As shown, the input speed of the fan clutch is the slip speed N slip When the fan clutch slip thermal power Q slip The value of is the highest. As shown in formula (2):

[0070]

[0071] Among them, T in formula (2) slip is the slip torque loss.

[0072] According to formula (1) and (2), we get formula (3):

[0073]

[0074] Among them, T in formula (3) max It is the parameter of no slip torque loss.

[0075] By solving the differential equation of formula (3), we get the differential equation (4):

[0076]

[0077] It should be noted that by solving the differential equation of formula (4), the solution (5) is obtained, that is, the maximum slip heat Q slipThe resulting boundary is that the fan output speed is 2 / 3 of the fan input speed, as shown in formula (6).

[0078] 2N slip N max =3N slip 2 (5)

[0079]

[0080] Among them, N max is the maximum input speed without slip, N slip It is the maximum output speed when there is no slip.

[0081] like Figure 4 As shown, when the fan clutch has a high slip thermal Q slip If the fan clutch output speed is not adjusted in time, the higher slip thermal Q slip This will cause the silicone oil to exceed the maximum application operating temperature, and the viscosity of the silicone oil will decrease and cannot be restored, causing the fan clutch torque to decay rapidly, lose the function of transmitting torque, and affect the cooling function of the fan clutch. Based on this defect, an embodiment of the present invention provides a cooling fan control method. When the input speed of the fan clutch reaches the speed threshold corresponding to the maximum slip heat of the fan clutch, the output speed of the fan clutch is adjusted in time to avoid excessive slip heat, causing the silicone oil temperature of the fan clutch to reach the maximum application operating temperature corresponding to the physical properties of the silicone oil, thereby ensuring the normal operation of the fan clutch.

[0082] Figure 5 The cooling fan control method provided in the embodiment of the present application is shown in FIG. Figure 1 As an example but not a limitation, the execution subject of this embodiment is a controller of a cooling fan, and this embodiment is not particularly limited here.

[0083] S501: Determine a first speed threshold of a cooling fan input speed corresponding to a preset silicone oil temperature, wherein the preset silicone oil temperature is a maximum application operating temperature corresponding to the physical properties of the silicone oil.

[0084] In an embodiment of the present application, during the operation of the cooling fan, the silicone oil temperature of the cooling fan is monitored in real time. When the input speed of the cooling fan gradually increases, the silicone oil temperature of the cooling fan becomes higher and higher. When the silicone oil temperature of the cooling fan reaches the maximum application operating temperature corresponding to the physical properties of the silicone oil, the real-time input speed of the cooling fan at this time is recorded as the first speed threshold of the cooling fan input speed, and the real-time output speed of the cooling fan at this time is recorded as the second speed threshold of the cooling fan output speed.

[0085] It should be noted that when the silicone oil temperature of the cooling fan reaches the maximum application operating temperature corresponding to the physical properties of the silicone oil, the viscosity of the silicone oil will decrease and cannot be restored, causing the fan clutch torque to decay rapidly and lose the function of transmitting torque. In order to avoid the silicone oil temperature being too high and affecting the operation of the cooling fan, when the silicone oil temperature of the cooling fan reaches the maximum application operating temperature corresponding to the physical properties of the silicone oil, that is, when the input speed of the cooling fan reaches the first speed threshold, thermal protection measures should be taken in time to reduce the output speed of the cooling fan.

[0086] S502: Acquire the input rotation speed of the cooling fan.

[0087] In the embodiment of the present application, when the engine speed of the vehicle is too high, the input speed of the electronically controlled silicone oil cooling fan will be too high, causing the temperature of the silicone oil to be too high. Therefore, the input speed of the cooling fan is monitored in real time during the driving process of the vehicle.

[0088] S503: If the input speed is greater than or equal to the first speed threshold, reduce the output speed of the cooling fan according to the control parameter.

[0089] For example, according to Figure 3 The exemplary process of silicone oil temperature change during fan operation should be understood that when the input speed of the fan gradually increases, when the input speed reaches Nin, the maximum temperature of the silicone oil will reach the maximum application operating temperature Tlim corresponding to the physical properties of the silicone oil, and the fan input speed at this time is Nin as the first speed threshold. When the fan input speed reaches the first speed threshold, the fan output speed should be reduced in time to avoid a fault caused by excessive silicone oil temperature.

[0090] Exemplarily, when the silicone oil temperature of the cooling fan reaches the maximum application operating temperature corresponding to the physical properties of the silicone oil, after determining the first speed threshold and the second speed threshold, the process of determining the control parameter is: determining the engine speed threshold corresponding to the first speed threshold according to the gear train speed ratio, determining the engine speed threshold and the duty cycle parameter corresponding to the second speed threshold according to the vehicle pre-table, and using the duty cycle parameter as the control parameter. Specifically, the gear train speed ratio is the ratio between the engine speed and the input speed of the cooling fan. Exemplarily, the vehicle pre-table is preset in the cooling fan controller. Specifically, the vehicle pre-table is a table containing the corresponding relationship between the engine speed, the duty cycle parameter and the output speed of the cooling fan.

[0091] Exemplarily, the control parameter is a PID parameter of a vehicle cooling fan. Specifically, the control parameter includes a PI control parameter, a PD control parameter or a PID control parameter.

[0092] It should be noted that the vehicle pre-table is a configuration table preset inside the vehicle controller for feedback control of the fan output speed. That is, during normal driving of the vehicle, the vehicle controller determines the corresponding feedback control parameters according to the engine speed and the target value of the cooling fan output speed that needs to be regulated.

[0093] Specifically, the process of reducing the output speed of the cooling fan according to the control parameters is as follows: determining the control voltage according to the duty cycle parameters; controlling the valve opening of the silicone oil clutch according to the control voltage; and controlling the output speed of the cooling fan according to the valve opening of the silicone oil clutch. It should be understood that in order to timely reduce the output speed of the fan, in the process of controlling the valve opening of the silicone oil clutch according to the control voltage corresponding to the duty cycle parameters, the valve opening of the silicone oil clutch is gradually reduced, and the amount of silicone oil is getting less and less, thereby achieving the purpose of reducing the output speed.

[0094] S504: When the output speed is less than or equal to the second speed threshold, stop controlling the cooling fan.

[0095] In the embodiment of the present application, according to Figure 3 An exemplary process of silicone oil temperature change during fan operation. When the maximum temperature of the silicone oil reaches the maximum application operating temperature Tlim corresponding to the physical properties of the silicone oil, at this time, the fan input speed is Nin, and the corresponding fan speed Nlim is used as the second speed threshold corresponding to the fan output speed.

[0096] Figure 6 Schematic diagram of the thermal protection zone related to the rotation speed provided in the embodiment of the present application, such as Figure 6 As shown, after adopting the cooling fan control method provided by the embodiment of the present application, when the engine speed enters a higher speed, that is, the input speed of the fan is greater than the first speed threshold, an overheating protection strategy of reducing the speed is executed, that is, the output speed of the cooling fan is reduced according to the control parameters, and the output speed of the fan will be forced to decrease. Based on the matching design of the clutch and the whole vehicle, the clutch thermal protection zone is generally in the higher speed area of ​​the engine, and limiting the fan speed in the thermal protection zone does not affect the cooling performance of the whole vehicle. At the same time, due to the material limitations of the whole vehicle, the output speed of the cooling fan is reduced according to the control parameters, so as to achieve the purpose of avoiding excessive linear speed of the fan blades when the input speed is too high.

[0097] The cooling fan control method provided in this embodiment reduces the output speed of the cooling fan according to the control parameter when the input speed of the cooling fan is greater than or equal to the first speed threshold corresponding to the maximum application operating temperature corresponding to the physical property of the silicone oil, and stops controlling the cooling fan when the output speed of the cooling fan is less than or equal to the second speed threshold. When the application determines that the input speed of the cooling fan is greater than the set speed threshold, the temperature of the fan clutch silicone oil is reduced in time by reducing the output speed of the cooling fan, thereby solving the problem that the silicone oil temperature is too high and affects the cooling function of the cooling fan.

[0098] Figure 7 The cooling fan control method provided in the embodiment of the present application is shown in FIG. Figure 2 .like Figure 7 As shown, in Figure 5 Based on the embodiment, another implementation process of determining the first speed threshold of the cooling fan input speed corresponding to the preset silicone oil temperature in S501 is as follows:

[0099] S701: Controlling an input speed of a cooling fan according to at least one speed parameter.

[0100] In the embodiment of the present application, in order to ensure the performance of the silicone oil clutch, a calibration method can also be used to simulate the thermal properties of the silicone oil to determine the thermal model between the temperature of the silicone oil and the input speed of the fan, so as to determine the input speed value of the fan corresponding to the maximum slip heat.

[0101] In the embodiment of the present application, since there is a relationship between the input speed of the fan and the engine speed, the engine speed parameter corresponding to each speed parameter can be determined according to the gear train speed ratio, and the engine can be controlled to operate according to the determined engine speed parameter, so that the input speed of the cooling fan is the set speed parameter.

[0102] S702: For each speed parameter, in the process of controlling the cooling fan to operate according to the speed parameter, a silicone oil temperature value of the cooling fan is obtained.

[0103] For example, in the process of adjusting the input speed of the fan by controlling the speed of the engine so that the input speed of the cooling fan runs according to the set multiple speed parameters, the silicone oil temperature inside the fan clutch is detected and recorded in real time.

[0104] It should be noted that in order to improve the accuracy of the determined thermal model, a relatively large parameter can be selected as at least one speed parameter within the set speed range, and the interval between each speed parameter is also relatively small. Among them, the speed range is from ambient temperature to the maximum input speed of the cooling fan determined according to empirical values. It should be noted that when the input speed of the cooling fan is the maximum input speed of the cooling fan determined according to empirical values, the silicone oil temperature inside the fan clutch is lower than the maximum application operating temperature corresponding to the physical properties of the silicone oil. It should be understood that by selecting the speed parameter within the speed range, the silicone oil temperature inside the fan clutch does not need to reach the maximum application operating temperature, that is, the silicone oil temperature thermal model inside the fan clutch can be obtained according to the speed parameter and the corresponding silicone oil temperature values ​​monitored, thereby estimating the first speed threshold and ensuring the normal operation of the fan clutch.

[0105] S703: Obtain a speed-temperature relationship function according to each speed parameter and the corresponding silicone oil temperature value.

[0106] In an embodiment of the present application, the temperature change rate of the reference silicone oil becomes lower and lower as the input speed of the fan increases. Therefore, the logarithmic function model can be used as the initial model of the silicone oil change thermal model, and the base of the logarithmic function can be determined based on the actual detected engine speed and silicone oil temperature values.

[0107] Exemplarily, for each speed parameter, a first coefficient corresponding to the speed parameter is determined according to the speed parameter and the corresponding silicone oil temperature value, a second coefficient is determined according to the mean of each first coefficient, and a speed-temperature relationship function is determined according to the second coefficient.

[0108] It should be noted that in order to improve the accuracy of the determined speed-temperature relationship function, the base of the logarithmic function corresponding to each speed parameter can be determined according to each speed parameter and the corresponding silicone oil temperature value. And each speed parameter is determined as the parameter of the speed-temperature relationship function with the mean of the corresponding base.

[0109] It should be noted that after determining the second coefficient according to the mean of each first coefficient, the constant of the logarithmic function can be determined according to the maximum speed parameter and the corresponding silicone oil temperature, and the speed-temperature relationship function can be obtained according to the determined constant and the mean of each speed parameter with the corresponding base.

[0110] S704: Determine a speed parameter corresponding to a preset silicone oil temperature according to a speed-temperature relationship function, and use the speed parameter corresponding to the preset silicone oil temperature as a first speed threshold.

[0111] In an embodiment of the present application, after determining a speed-temperature relationship function that can represent the silicone oil thermal model, a speed parameter corresponding to a preset silicone oil temperature is determined according to the speed-temperature relationship function, and the speed parameter corresponding to the preset silicone oil temperature is used as the first speed threshold.

[0112] The cooling fan control method provided in the present embodiment adopts a calibration method to set the cooling fan to operate under different input speed parameters, measure the silicone oil temperature of the cooling fan at different input speeds, and determine the silicone oil thermal model, i.e., the speed-temperature relationship function, based on the measured silicone oil temperature and the corresponding speed parameter, and determine the speed parameter corresponding to the preset silicone oil temperature based on the speed-temperature relationship function. The cooling fan control method provided in the present embodiment of the application determines the input speed of the fan corresponding to the maximum application operating temperature corresponding to the physical properties of the silicone oil when the maximum temperature of the silicone oil reaches the maximum application operating temperature corresponding to the physical properties of the silicone oil without affecting the normal function of the fan clutch.

[0113] Figure 8 The cooling fan control method provided in the embodiment of the present application is shown in FIG. Figure 3 .exist Figure 6 The cooling fan control method provided in the embodiment is based on Figure 8 As shown, after the output speed of the cooling fan is reduced according to the control parameters in S502, the control process of the cooling fan is specifically as follows:

[0114] S801: Acquire the input speed of the cooling fan.

[0115] S802: If the input speed is greater than or equal to the first speed threshold, reduce the output speed of the cooling fan according to the control parameter.

[0116] In the embodiment of the present application, the method and effect implemented by S801 to S802 are similar to Figure 5 S502 to S503 in the embodiment are consistent and will not be described again.

[0117] S803: Obtain the output speed of the cooling fan.

[0118] S804: If the output speed is greater than the second speed threshold, determine the difference between the output speed and the second speed threshold.

[0119] In the embodiment of the present application, the control effect of the fan output speed is related to the actual driving environment of the vehicle. Therefore, after reducing the output speed of the cooling fan according to the control parameter, the output speed after control may still be greater than the second speed threshold.

[0120] In order to ensure the effect of reducing the output speed of the cooling fan, the output speed of the fan may be further regulated by determining the difference between the output speed and the second speed threshold to ensure the effect of the thermal protection strategy.

[0121] S805: Determine an adjustment duty cycle parameter corresponding to the difference.

[0122] In the embodiment of the present application, for example, the control parameters corresponding to the continued regulation of the fan output speed can be determined according to the vehicle pre-table. Specifically, the adjustment duty cycle parameters corresponding to the difference can be determined through the vehicle pre-table.

[0123] S806: Control the output speed of the cooling fan according to the adjusted duty cycle parameter.

[0124] S807: If the output speed is less than or equal to the second speed threshold, stop controlling the cooling fan.

[0125] In an embodiment of the present application, the output speed of the cooling fan is continued to be controlled according to the adjusted duty cycle parameter, and the output speed of the cooling fan is continued to be reduced so that the output speed meets or is equal to the second speed threshold condition, thereby achieving the purpose of reducing the silicone oil temperature.

[0126] The cooling fan control method provided in this embodiment detects the actual change of the output speed of the cooling fan. When the output speed of the cooling fan does not reach a condition that is less than or equal to the second speed threshold, the output speed of the cooling fan is continuously regulated according to the difference between the output speed of the cooling fan and the second speed threshold, so as to timely reduce the output speed of the cooling fan and achieve the purpose of reducing the silicone oil temperature.

[0127] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0128] Corresponding to the cooling fan control method described in the above embodiment, Fig. 9 : is a structural block diagram of a cooling fan control device provided in an embodiment of the present application. For the sake of convenience of explanation, only the parts related to the embodiment of the present application are shown.

[0129] Reference Fig. 9 The cooling fan control device includes: a determination module 901, an acquisition module 902, a control module 903 and a stop module 904.

[0130] The determination module 901 is used to determine a first speed threshold of a cooling fan input speed corresponding to a preset silicone oil temperature, wherein the preset silicone oil temperature is a maximum application operating temperature corresponding to the physical properties of the silicone oil;

[0131] The acquisition module 902 is used to acquire the input speed of the cooling fan;

[0132] The control module 903 is configured to reduce the output speed of the cooling fan according to a control parameter if the input speed is greater than or equal to the first speed threshold;

[0133] The stopping module 904 is configured to stop controlling the cooling fan when the output speed is less than or equal to a second speed threshold.

[0134] It should be noted that the information interaction, execution process, etc. between the above-mentioned modules / units are based on the same concept as the method embodiment of the present application. Their specific functions and technical effects can be found in the method embodiment part and will not be repeated here.

[0135] in addition, Fig. 9 The cooling fan control device shown may be a software unit, a hardware unit, or a combination of software and hardware units built into an existing terminal device, or may be integrated into the terminal device as an independent pendant, or may exist as an independent terminal device.

[0136] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0137] Fig.10 1 is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. The electronic device 100 provided in an embodiment of the present application includes: at least one processor 101 ( Fig.10 Only one is shown), a memory 102 and a computer program 103 stored in the memory 102 and executable on the at least one processor 101, wherein the processor 101 implements the steps performed by the electronic device in any of the above cooling fan control method embodiments when executing the computer program 103.

[0138] The processor 101 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0139] In some embodiments, the memory 102 may be an internal storage unit of the electronic device 100, such as a hard disk or memory of the electronic device 100. In other embodiments, the memory 102 may also be an external storage device of the electronic device 100, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the electronic device 100. Further, the electronic device 100 may also include both an internal storage unit of the electronic device 100 and an external storage device. The memory 102 is used to store an operating system, an application program, a boot loader (Boot Loader), data and other programs, such as the program code of the computer program, etc. The memory 102 may also be used to temporarily store data that has been output or is to be output.

[0140] An embodiment of the present application further provides a vehicle, comprising an electronic device, wherein the electronic device can execute the steps in any of the above-mentioned cooling fan control methods.

[0141] An embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps executed by the electronic device in any of the above cooling fan control method embodiments can be implemented.

[0142] An embodiment of the present application provides a computer program product. When the computer program product is run on a terminal device, the terminal device implements the steps performed by the electronic device in any of the above cooling fan control method embodiments.

[0143] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, which can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may at least include: any entity or device that can carry the computer program code to the device / terminal device, a recording medium, a computer memory, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), an electric carrier signal, a telecommunication signal, and a software distribution medium. For example, a USB flash drive, a mobile hard disk, a magnetic disk or an optical disk. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electric carrier signals and telecommunication signals.

[0144] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0145] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0146] In the embodiments provided in the present application, it should be understood that the disclosed devices / terminal equipment and methods can be implemented in other ways. For example, the device / terminal equipment embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0147] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0148] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A cooling fan control method, characterized in that: The method comprises: Determine a first speed threshold of the cooling fan input speed corresponding to a preset silicone oil temperature, wherein the preset silicone oil temperature is a maximum application operating temperature corresponding to the physical properties of the silicone oil; Get the input speed of the cooling fan; If the input speed is greater than or equal to the first speed threshold, reducing the output speed of the cooling fan according to the control parameter; When the output speed is less than or equal to a second speed threshold, stop controlling the cooling fan; the second speed threshold is the real-time output speed of the cooling fan when the silicone oil temperature of the cooling fan reaches the maximum application operating temperature corresponding to the physical properties of the silicone oil.

2. The cooling fan control method according to claim 1, wherein: The step of determining a first speed threshold of the cooling fan input speed corresponding to the preset silicone oil temperature includes: controlling an input speed of the cooling fan according to at least one speed parameter; For each of the speed parameters, in the process of controlling the cooling fan to operate according to the speed parameter, obtaining a silicone oil temperature value of the cooling fan; Obtaining a speed-temperature relationship function according to each speed parameter and the corresponding silicone oil temperature value; A speed parameter corresponding to a preset silicone oil temperature is determined according to the speed-temperature relationship function, and the speed parameter corresponding to the preset silicone oil temperature is used as the first speed threshold.

3. The cooling fan control method according to claim 2, wherein: The obtaining of the speed-temperature relationship function according to each speed parameter and the corresponding silicone oil temperature value comprises: For each of the speed parameters, determining a first coefficient corresponding to the speed parameter according to the speed parameter and a corresponding silicone oil temperature value; determining a second coefficient according to a mean value of each of the first coefficients; The rotation speed and temperature relationship function is determined according to the second coefficient.

4. The cooling fan control method according to claim 2, wherein: Before reducing the output speed of the cooling fan according to the control parameter, the method further comprises: Determining an engine speed threshold corresponding to the first speed threshold according to a gear train speed ratio, wherein the gear train speed ratio is a ratio between the engine speed and the input speed of the cooling fan; Determining the engine speed threshold and the duty cycle parameter corresponding to the second speed threshold according to a vehicle pre-table, wherein the vehicle pre-table is a table containing a correspondence between the engine speed, the duty cycle parameter and the output speed of the cooling fan; The duty cycle parameter is used as the control parameter.

5. The cooling fan control method according to claim 4, wherein: The step of reducing the output speed of the cooling fan according to the control parameter comprises: Determining a control voltage according to the duty cycle parameter; controlling the valve opening of the silicone oil clutch according to the control voltage; The output speed of the cooling fan is controlled according to the valve opening of the silicone oil clutch.

6. The cooling fan control method according to claim 5, characterized in that: When the output speed is less than or equal to a second speed threshold, stopping controlling the cooling fan includes: Obtaining the output speed of the cooling fan; If the output speed is greater than the second speed threshold, determining a difference between the output speed and the second speed threshold; Determining an adjustment duty cycle parameter corresponding to the difference; Controlling the output speed of the cooling fan according to the adjusted duty cycle parameter; If the output speed is less than or equal to the second speed threshold, the cooling fan is stopped from being controlled.

7. A cooling fan control device, characterized in that: The device comprises: A determination module, used to determine a first speed threshold of a cooling fan input speed corresponding to a preset silicone oil temperature, wherein the preset silicone oil temperature is a maximum application operating temperature corresponding to the physical properties of the silicone oil; An acquisition module, used for acquiring the input speed of the cooling fan; a control module, configured to reduce the output speed of the cooling fan according to a control parameter if the input speed is greater than or equal to the first speed threshold; A stop module is used to stop controlling the cooling fan when the output speed is less than or equal to a second speed threshold; the second speed threshold is the real-time output speed of the cooling fan when the silicone oil temperature of the cooling fan reaches the maximum application operating temperature corresponding to the physical properties of the silicone oil.

8. An electronic device, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the cooling fan control method according to any one of claims 1 to 6 when executing the computer program.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and when the processor executes the computer-executable instructions, the cooling fan control method according to any one of claims 1 to 6 is implemented.

10. A vehicle, characterized in that: Comprising the electronic device as claimed in claim 8.

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