Cooling fan control method, device, controller and vehicle

Abstract

The present application is applicable to the field of vehicle cooling control technology, and provides a cooling fan control method, device, controller and vehicle, including: when it is detected that the altitude of the vehicle's driving position is higher than or equal to a first altitude threshold, determining the engagement rate of the cooling fan; if the engagement rate is greater than a preset engagement rate value, determining the control parameter corresponding to the altitude of the driving position; and controlling the speed of the cooling fan according to the control parameter. The present application adopts different control parameters for different driving altitudes, thereby improving the control accuracy 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, controller 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 is driving in a plateau environment, due to the low air pressure and low air density in the plateau area, the fan blade torque of the cooling fan is reduced during rotation, and the cooling fan full mesh speed increases, the slip becomes smaller, and the clutch return oil pressure decreases and the return oil speed decreases, resulting in the cooling fan being difficult to separate and always being in a full mesh speed state. If the cooling fan is always in a full mesh speed state, the cooling fan feedback control will fail or the sensitivity will decrease, resulting in the system being overcooled. Summary of the invention

[0004] The embodiments of the present application provide a cooling fan control method, device, controller and vehicle, which control the cooling fan by determining control parameters according to the driving height, thereby improving the control accuracy of the cooling fan.

[0005] In a first aspect, an embodiment of the present application provides a cooling fan control method, which is applied to a controller of a vehicle cooling fan, and the method includes:

[0006] When it is detected that the altitude of the vehicle driving position is higher than or equal to a first altitude threshold, determining an engagement rate of the cooling fan;

[0007] If the meshing rate is greater than a preset meshing rate value, determining a control parameter corresponding to the altitude of the driving position;

[0008] The rotation speed of the cooling fan is controlled according to the control parameter.

[0009] In a possible implementation manner of the first aspect, determining the control parameter corresponding to the altitude of the driving position includes:

[0010] The control parameter corresponding to the altitude of the driving position is determined according to a pre-stored relationship table, wherein the relationship table includes at least one altitude interval and a control parameter corresponding to each altitude interval, the control parameter corresponding to the first altitude interval is greater than the control parameter corresponding to the second altitude interval, and the maximum height of the first altitude interval is greater than the maximum height of the second altitude interval.

[0011] In a possible implementation manner of the first aspect, before determining the control parameter corresponding to the altitude of the driving position according to the pre-stored relationship table, the method further includes:

[0012] determining at least one altitude interval according to a preset altitude interval;

[0013] For each of the altitude intervals, obtaining a first target control parameter when the vehicle is traveling in the altitude interval, wherein the first target control parameter is a control parameter corresponding to controlling the meshing rate of the vehicle cooling fan to be a preset meshing rate value;

[0014] Generate the relationship table according to each of the altitude intervals and the first target control parameters corresponding to each of the altitude intervals;

[0015] Correspondingly, determining the control parameter corresponding to the altitude of the driving position according to the pre-stored relationship table includes:

[0016] A first target control parameter corresponding to the altitude of the driving position is determined according to a pre-stored relationship table, and the first target control parameter is used as the control parameter corresponding to the altitude of the driving position.

[0017] In a possible implementation manner of the first aspect, before determining the control parameter corresponding to the altitude of the driving position according to the pre-stored relationship table, the method further includes:

[0018] determining at least one altitude interval according to a preset altitude interval;

[0019] For each of the altitude intervals, a second target control parameter when the vehicle is traveling within the altitude interval is obtained, wherein the second target control parameter is a control parameter corresponding to when the meshing rate of the vehicle cooling fan is controlled to be a preset meshing rate value according to the initial control parameter, and the initial control parameter is a control parameter corresponding to when the meshing rate of the vehicle cooling fan is controlled to be a preset meshing rate value when the altitude of the vehicle driving position is lower than the first altitude threshold;

[0020] Generate the relationship table according to each of the altitude intervals and the second target control parameters corresponding to each of the altitude intervals;

[0021] Correspondingly, determining the control parameter corresponding to the altitude of the driving position according to the pre-stored relationship table includes:

[0022] A second target control parameter corresponding to the altitude of the driving position is determined according to a pre-stored relationship table, and the second target control parameter is used as the control parameter corresponding to the altitude of the driving position.

[0023] In a possible implementation manner of the first aspect, for each altitude interval, obtaining a first target control parameter when the vehicle travels in the altitude interval includes:

[0024] Determine the air pressure parameter corresponding to each altitude interval;

[0025] For each of the air pressure parameters, a first target control parameter corresponding to the vehicle traveling under the condition of the air pressure parameter is determined.

[0026] In a possible implementation manner of the first aspect, controlling the rotation speed of the cooling fan according to the control parameter includes:

[0027] Obtaining a modified control parameter according to the product of the control parameter and the initial control parameter;

[0028] The rotation speed of the cooling fan is controlled according to the corrected control parameter.

[0029] In a possible implementation manner of the first aspect, the method further includes:

[0030] Obtaining an air pressure value monitored by a vehicle controller, wherein the air pressure value is measured by a pressure sensor of the vehicle;

[0031] If it is determined that the air pressure value is greater than or equal to a preset air pressure parameter value, then it is determined that the altitude of the vehicle driving position is higher than or equal to a first altitude threshold, and the preset air pressure parameter value is the atmospheric pressure value of the first altitude threshold area.

[0032] In a possible implementation manner of the first aspect, the method further includes:

[0033] Receiving the driving position parameters of the vehicle sent by the vehicle controller, wherein the driving position parameters are satellite positioning position information or Beidou positioning position information;

[0034] If it is determined that the vehicle is traveling in a preset altitude area according to the satellite positioning position information or the Beidou positioning position information, it is determined that the altitude of the vehicle's driving position is higher than or equal to a first altitude threshold, wherein the altitude of the preset altitude area is the first altitude threshold.

[0035] In a second aspect, an embodiment of the present application provides a cooling fan control device, comprising:

[0036] a detection module, configured to determine an engagement rate of the cooling fan when it is detected that the altitude of the vehicle driving position is higher than or equal to a first altitude threshold;

[0037] a determination module, configured to determine a control parameter corresponding to the altitude of the driving position if the engagement rate is greater than a preset engagement rate value;

[0038] A control module is used to control the rotation speed of the cooling fan according to the control parameter.

[0039] In a third aspect, an embodiment of the present application provides a controller 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 vehicle, wherein the vehicle controls a silicone oil fan clutch by implementing a cooling fan control method as described in any one of the first aspects.

[0041] It can be understood that the beneficial effects of the second to fourth aspects mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here.

[0042] Compared with the prior art, the embodiments of the present application have the following beneficial effects: when the altitude of the vehicle's driving position is detected to be higher than or equal to the first altitude threshold, the engagement rate of the cooling fan is determined; if the engagement rate is greater than the preset engagement rate value, the control parameter corresponding to the altitude of the driving position is determined; and the speed of the cooling fan is controlled according to the control parameter. The present application adopts different control parameters for different driving heights, thereby improving the control accuracy of the cooling fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] 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.

[0044] Figure 1 is a schematic diagram of the structure of an engine system provided in an embodiment of the present application;

[0045] Figure 2 is a cross-sectional view of a fan clutch mechanism provided in an embodiment of the present application;

[0046] Figure 3 A comparison chart of the torque characteristics of plateau and plain fan blades provided in the embodiment of the present application;

[0047] Figure 4 A schematic diagram of a non-separated plateau silicone oil fan provided in an embodiment of the present application;

[0048] Figure 5 This is a comparison chart of the speed characteristics of the electric-controlled silicone oil fan on the plateau and plain provided by the embodiment of the present application;

[0049] Figure 6 The cooling fan control method provided in the embodiment of the present application is shown in FIG. Figure 1 ;

[0050] Figure 7 This is a schematic diagram of the normal separation of a plateau silicone oil fan provided in an embodiment of the present application;

[0051] Figure 8 The cooling fan control method provided in the embodiment of the present application is shown in FIG. Figure 2 ;

[0052] Fig. 9 The cooling fan control method provided in the embodiment of the present application is shown in FIG. Figure 3 ;

[0053] Fig.10 is a structural block diagram of a cooling fan control device provided in an embodiment of the present application;

[0054] Fig.11 It is a schematic diagram of the structure of the controller provided in the 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 an engine system including an electronically controlled silicone oil clutch fan 101, the fan clutch of the electronically controlled silicone oil clutch fan 101 provided in the embodiment of the present application includes an active 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 2As 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 2 On 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 threaded magnetic force acting on the valve stem assembly 17. Under the constraint of the stop seat 18, the valve stem assembly 17 moves forward and backward along the axial direction, 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 uses PID to feedback control the fan speed by comparing the actual fan speed with the target speed. This control method through feedback generally uses PID control. During the driving process of the vehicle, the engine speed changes at any time. Therefore, in the calibration process of the silicone oil fan, the stability of the speed control is generally pursued. The principle of selecting the PID control parameters is to minimize the speed fluctuation, so the P and I control factors are fixed values.

[0065] During the actual driving of the vehicle, the torque of the silicone oil fan is calculated as shown in formula (1):

[0066]

[0067] Among them, T fan is the torque corresponding to the rotation of the fan, μ is the viscosity of the silicone oil, d n is the speed difference between the active plate and the housing, d y is the clearance between the active plate and the labyrinth groove of the shell, A is the surface area of ​​the working chamber, μ, d y and A is related to the fan's clutch.

[0068] When the vehicle enters a plateau environment, under the condition of a constant fan speed, due to the low air density and low air pressure in the plateau environment, the torque required for the fan to rotate is also reduced. Figure 3 The comparison diagram of the torque characteristics of the plateau and plain fan blades provided in the embodiment of the present application is as follows: Figure 3 As shown, at different engine speeds, the fan torque demand in plateaus is always lower than that in plains, and the higher the engine speed, the greater the reduction in the required torque.

[0069] Based on formula (1), when the vehicle enters the plateau environment, under the condition of constant fan speed, due to the low air density and low air pressure in the plateau environment, the torque required for the fan to rotate is also reduced, that is, T in formula (1) fan Reduced. Due to μ, d y and A remains unchanged, then accordingly, d n According to T fan The decrease in the speed will lead to a decrease in the meshing speed of the electronically controlled silicone oil clutch fan 101, which will increase. However, based on the feedback control of the fan speed by the PID corresponding to the current speed, the meshing speed of the electronically controlled silicone oil clutch fan 101 will continue to increase, and the return oil pressure will decrease due to the small slip, resulting in a decrease in the clutch speed regulation sensitivity. When the return oil pressure of the silicone oil decreases, the return oil flow of the silicone oil decreases and the return oil time is extended, the adjustment accuracy of the fan clutch decreases, and the electronically controlled silicone oil clutch fan continues to run at a high speed in a fully meshed speed state, resulting in increased vehicle fuel consumption, system overcooling and other problems.

[0070] Figure 4 This is a schematic diagram of a non-separated highland silicone oil fan provided in an embodiment of the present application. Figure 4 As shown in FIG. 1 , the fan target speed is lower than the fan actual speed, and the fan is now in a fully engaged state.

[0071] Figure 5 This is a comparison chart of the speed characteristics of the electric-controlled silicone oil fan on the plateau and plain provided by the embodiment of the present application. Figure 5As shown, at different engine speeds, when the electronically controlled silicone oil clutch fan is operating in a fully engaged state, the fan speed corresponding to driving on a plateau is always higher than the fan speed when driving on a plain.

[0072] Figure 6 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 an electronically controlled silicone oil clutch fan, and this embodiment is not particularly limited here.

[0073] S601: When it is detected that the altitude of the vehicle driving position is higher than or equal to a first altitude threshold, determining an engagement rate of a cooling fan.

[0074] In the embodiment of the present application, when the vehicle is traveling in an area with a high altitude, Figure 4 In the embodiment, the fan of the electronically controlled silicone oil clutch operates in a fully engaged state, and the speed regulation sensitivity of the clutch decreases due to the small slip and the reduced return oil pressure.

[0075] In the embodiment of the present application, when the vehicle enters a plateau area, such as an area with high air pressure or when the altitude reaches a certain threshold, the current fan engagement rate is calculated. If the fan engagement rate reaches a certain threshold, the control parameters corresponding to the plateau area are used to control the speed of the cooling fan.

[0076] Exemplarily, the air pressure value monitored by the vehicle controller is obtained. If the air pressure value is determined to be greater than or equal to a preset air pressure parameter value, then the altitude of the vehicle's driving position is determined to be higher than or equal to a first altitude threshold, and the preset air pressure parameter value is the atmospheric pressure value of the first altitude threshold area. Specifically, the air pressure value is measured by the vehicle's pressure sensor. The air pressure value can be measured according to the pressure sensor. The altitude of the vehicle's current driving position is determined according to the measured air pressure value.

[0077] Exemplarily, the driving position parameters of the vehicle sent by the vehicle controller are received, wherein the driving position parameters are the position information of the Global Positioning System (GPS) or the Beidou positioning position information; if the vehicle is determined to be traveling in a preset altitude area based on the satellite positioning position information or the Beidou positioning position information, then the altitude of the vehicle's driving position is determined to be higher than or equal to the first altitude threshold, wherein the altitude of the preset altitude area is the first altitude threshold. It should be noted that before determining whether the altitude of the vehicle's driving position is higher than or equal to the first altitude threshold, the area above the first altitude threshold will be determined as the preset altitude area. The current driving position of the vehicle is determined based on a vehicle-mounted positioning device such as a GPS positioning system or a Beidou positioning system. If it is determined that the vehicle is traveling in a preset altitude area, the altitude of the vehicle's driving position is determined to be higher than or equal to the first altitude threshold.

[0078] S602: If the engagement rate is greater than a preset engagement rate value, determine a control parameter corresponding to the altitude of the driving position.

[0079] In an embodiment of the present application, when the altitude of the vehicle's driving position is higher than or equal to the first altitude threshold, the engagement rate of the current cooling fan is obtained. Specifically, it is based on the ratio between the measured actual speed of the fan and the input target fan speed. For example, when the engagement rate is greater than the preset engagement rate value, it means that the fan is currently in a fully engaged state, and the fan speed needs to be adjusted in time to avoid overcooling.

[0080] Exemplarily, the control parameters corresponding to the altitude of the driving position are determined according to a pre-stored relationship table, wherein the relationship table includes at least one altitude interval and the control parameters corresponding to each altitude interval, the control parameters corresponding to the first altitude interval are greater than the control parameters corresponding to the second altitude interval, and the maximum height of the first altitude interval is greater than the maximum height of the second altitude interval.

[0081] In an embodiment of the present application, the control parameter is a proportional control parameter and / or an integral control parameter of the vehicle cooling fan. Exemplarily, the first target control parameter corresponding to each altitude interval is stored in the relationship table, or the second target control parameter corresponding to each altitude interval is stored in the relationship table. Among them, the first target control parameter is the control parameter corresponding to the meshing rate of the vehicle cooling fan being controlled to a preset meshing rate value at each altitude interval. The second target control parameter is the control parameter corresponding to the meshing rate of the vehicle cooling fan being controlled to a preset meshing rate value according to the initial control parameter at each altitude interval. Specifically, the initial control parameter is the control parameter corresponding to the meshing rate of the vehicle cooling fan being controlled to a preset meshing rate value when the altitude of the vehicle's driving position is lower than the first altitude threshold. That is, the initial control parameter is the existing control parameter when the vehicle is driving on a plain.

[0082] Exemplarily, after the control parameter is determined according to the relationship table storing the first target control parameter corresponding to each altitude interval, when the first target control parameter is a proportional control parameter of a vehicle cooling fan, the pre-stored relationship table is as shown in Table 1:

[0083] Table 1

[0084]

[0085] Among them, the proportional control parameter gradually increases with the increase of the altitude interval. Exemplarily, P1, P2, P3, P4 and P5 increase in sequence. In a possible implementation, P1, P2, P3, P4 and P5 gradually increase according to the preset proportional coefficient, P1 is 0.1500, the preset proportional coefficient is 1.05, then P2, P3, P4 and P5 are 0.1500*1.05, 0.1500*1.05*1.05, 0.1500*1.05*1.05*1.05, 0.1500*1.05*1.05*1.05, that is, P1, P2, P3, P4 and P5 are 0.15, 0.1575, 0.1654, 0.1736 and 0.1823 respectively.

[0086] Exemplarily, when the first target control parameter is an integral control parameter of a vehicle cooling fan, the pre-stored relationship table is shown in Table 2:

[0087] Table 2

[0088]

[0089] The integral control parameter gradually increases with the increase of the altitude interval. For example, I1, I2, I3, I4 and I5 increase in sequence. The integral control parameter gradually increases with the increase of the altitude interval. For example, I1, I2, I3, I4 and I5 increase in sequence. In a possible implementation, I1, I2, I3, I4 and I5 gradually increase according to a preset integral coefficient, I1 is 0.000011, and the preset integral coefficient is 1.06, then I2, I3, I4 and I5 are 0.000011*1.06, 0.000011*1.06*1.06, 0.000011*1.06*1.06*1.06, 0.000011*1.06*1.06*1.06, 0.000011*1.06*1.06*1.06, that is, I1, I2, I3, I4 and I5 are 0.000011, 0.00001166, 0.00001224, 0.00001286 and 0.0000135 respectively.

[0090] In a possible implementation, when the control parameter includes a proportional control parameter and an integral control parameter of a vehicle cooling fan, the fan speed is controlled according to the product of the proportional control parameter determined in Table 1 and the integral control parameter determined in Table 2.

[0091] S603: Control the speed of the cooling fan according to the control parameter.

[0092] In an embodiment of the present application, exemplarily, when the control parameters include integral control parameters and proportional control parameters, that is, when the pre-stored relationship table includes Table 1 and Table 2, when it is determined that the altitude of the vehicle's current driving position is 1800 meters, the control parameters determined according to Table 1 and Table 2 include proportional control parameter P2 and integral control parameter I2, and the speed of the cooling fan is feedback controlled according to the product of P2 and I2.

[0093] In a possible implementation, illustratively, when the second target control parameter is a proportional control parameter of a vehicle cooling fan, the initial control parameter is P0. After determining the proportional control parameter corresponding to the altitude of the current driving position according to the relationship table storing the second target control parameter corresponding to each altitude interval, a modified control parameter is obtained according to the product of the initial control parameter P0 and the proportional control parameter corresponding to the altitude of the current driving position, and feedback control is performed on the speed of the cooling fan according to the modified control parameter.

[0094] In a possible implementation, illustratively, when the second target control parameter is an integral control parameter of the vehicle cooling fan, the initial control parameter is I 0. After the integral control parameter corresponding to the altitude of the current driving position is determined according to the relationship table storing the second target control parameter corresponding to each altitude interval, a modified control parameter is obtained according to the product of the initial control parameter I 0 and the integral control parameter corresponding to the altitude of the current driving position, and feedback control is performed on the speed of the cooling fan according to the modified control parameter.

[0095] Figure 7 This is a schematic diagram of the normal separation of the plateau silicone oil fan provided in the embodiment of the present application. Figure 7 As shown, by adopting the cooling fan control method provided in the embodiment of the present application, the control parameters correspond to the altitude at which the vehicle is traveling, thereby improving the fan speed control accuracy so that the actual fan speed follows the fan target speed.

[0096] The cooling fan control method provided in this embodiment adopts different feedback control parameters for different driving heights to avoid an increase in the amount of meshing, and improves the control accuracy of the cooling fan by increasing the return oil pressure.

[0097] Figure 8 The cooling fan control method provided in the embodiment of the present application is shown in FIG. Figure 2 .exist Figure 6 The cooling fan control method provided in the embodiment is based on Figure 8 As shown, before determining the control parameter corresponding to the altitude of the driving position in S602, the specific process of obtaining the relationship table is as follows:

[0098] S801: Determine at least one altitude interval according to a preset altitude interval.

[0099] S802: For each altitude interval, obtaining a first target control parameter when the vehicle is traveling in the altitude interval, wherein the first target control parameter is a control parameter corresponding to controlling an engagement rate of a cooling fan of the vehicle to be a preset engagement rate value.

[0100] In the embodiment of the present application, the vehicle is set to travel in areas with different altitudes. When the vehicle travels in any altitude interval, the control parameter is adjusted so that the meshing ratio corresponding to the fan speed and the target fan speed reaches a preset meshing ratio value, thereby determining the first target control parameter corresponding to the current altitude interval.

[0101] It should be noted that, the higher the altitude corresponding to the altitude interval, the larger the corresponding first target control parameter.

[0102] Specifically, the air pressure parameter corresponding to each altitude interval is determined; for each air pressure parameter, a first target control parameter corresponding to the vehicle traveling under the condition of the air pressure parameter is determined.

[0103] Exemplarily, the process of driving a vehicle in areas at different altitudes can be simulated by setting the vehicle to drive in different air pressure environments. Specifically, the air pressure parameters corresponding to each altitude interval are determined. Among them, the higher the altitude corresponding to the altitude interval, the lower the corresponding air pressure parameters. In a confined space, the air pressure is set according to the air pressure parameters corresponding to the altitude interval, and the first target control parameters corresponding to the vehicle driving in the space are obtained.

[0104] S803: Generate a relationship table according to each altitude interval and the first target control parameter corresponding to each altitude interval.

[0105] In an embodiment of the present application, a relationship table is generated for a proportional control parameter and / or an integral control parameter based on the first target control parameter obtained. Exemplarily, when the first target control parameter is a proportional control parameter, on the one hand, a relationship table can be directly generated based on each altitude interval and the proportional control parameter corresponding to each of them, and on the other hand, a coefficient can be determined based on the ratio between the proportional control parameter and the existing control parameters of the vehicle, including the proportional control parameter, and a relationship table is generated based on each altitude interval and the coefficient corresponding to each of them. When the first target control parameter is an integral control parameter, the relationship table generation process corresponding to the above-mentioned proportional control parameter is executed.

[0106] The cooling fan control method provided in the present embodiment adopts a calibration method to set the vehicle to travel under air pressure parameters corresponding to different altitude intervals, determine the first target control parameters corresponding to when the vehicle travels in different altitude intervals, and generate a relationship table based on the determined first target control parameters corresponding to the different altitude intervals. In the process of controlling the fan speed, the first target control parameter corresponding to the altitude area can be determined based on the relationship table, thereby improving the control efficiency of the cooling fan.

[0107] Fig. 9 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 Fig. 9 As shown, before determining the control parameter corresponding to the altitude of the driving position in S602, the specific process of obtaining the relationship table is as follows:

[0108] S901: Determine at least one altitude interval according to a preset altitude interval.

[0109] S902: For each altitude interval, obtain a second target control parameter when the vehicle is traveling within the altitude interval, wherein the second target control parameter is a control parameter corresponding to when the engagement rate of the vehicle cooling fan is controlled to be a preset engagement rate value according to the initial control parameter, and the initial control parameter is a control parameter corresponding to when the altitude of the vehicle driving position is lower than the first altitude threshold, when the engagement rate of the vehicle cooling fan is controlled to be a preset engagement rate value.

[0110] In the embodiment of the present application, the vehicle is set to travel in areas with different altitudes. When the vehicle travels in any altitude interval, the control parameters are adjusted based on the initial control parameters corresponding to the altitude of the vehicle's driving position being lower than the first altitude threshold, so that the meshing rate corresponding to the fan speed and the target fan speed reaches a preset meshing rate value, thereby determining the second target control parameter corresponding to the current altitude interval.

[0111] It should be noted that, the higher the altitude corresponding to the altitude interval, the larger the corresponding second target control parameter.

[0112] Specifically, the air pressure parameter corresponding to each altitude interval is determined; for each air pressure parameter, the second target control parameter corresponding to the vehicle driving under the condition of the air pressure parameter is determined.

[0113] Exemplarily, the process of driving a vehicle in areas at different altitudes can be simulated by setting the vehicle to drive in different air pressure environments. Specifically, the air pressure parameters corresponding to each altitude interval are determined. Among them, the higher the altitude corresponding to the altitude interval, the lower the corresponding air pressure parameters. In a confined space, the air pressure is set according to the air pressure parameters corresponding to the altitude interval, and the fan speed is regulated based on the initial control parameters corresponding to the altitude of the vehicle's driving position when it is lower than the first altitude threshold, and the second target control parameters corresponding to the vehicle driving in the space are obtained.

[0114] S903: Generate a relationship table according to each altitude interval and the second target control parameter corresponding to each altitude interval.

[0115] In an embodiment of the present application, a relationship table is generated for a proportional control parameter and / or an integral control parameter based on the obtained second target control parameter. Exemplarily, when the second target control parameter is a proportional control parameter, on the one hand, a relationship table can be directly generated based on each altitude interval and the corresponding proportional control parameter, and on the other hand, a coefficient can be determined based on the ratio between the proportional control parameter and the existing control parameters of the vehicle, including the proportional control parameter, and a relationship table is generated based on each altitude interval and the corresponding coefficient. When the second target control parameter is an integral control parameter, the above-mentioned relationship table generation process corresponding to the proportional control parameter is executed.

[0116] The cooling fan control method provided in this embodiment controls the fan speed based on the initial control parameters corresponding to the vehicle when traveling on a plain, so as to determine the vehicle traveling in different altitude ranges and the corresponding second target control parameters. This not only reduces the time for determining the control parameters, but also meets the control requirement of small speed fluctuation during feedback control, while improving the feedback control accuracy of the vehicle in a plateau environment.

[0117] 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.

[0118] Corresponding to the cooling fan control method described in the above embodiment, Fig.10 : 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.

[0119] Reference Fig.10 The cooling fan control device includes: a detection module 1001, a determination module 1002 and a control module 1003.

[0120] The detection module 1001 is used to determine the engagement rate of the cooling fan when it is detected that the altitude of the vehicle driving position is higher than or equal to a first altitude threshold;

[0121] The determination module 1002 is configured to determine a control parameter corresponding to the altitude of the driving position if the engagement rate is greater than a preset engagement rate value;

[0122] The control module 1003 is used to control the rotation speed of the cooling fan according to the control parameter.

[0123] 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.

[0124] in addition, Fig.10 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.

[0125] 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.

[0126] Fig.11 1 is a schematic diagram of the structure of the controller provided in the embodiment of the present application. The controller 110 provided in the embodiment of the present application includes: at least one processor 111 ( Fig.11 Only one is shown), a memory 112 and a computer program 113 stored in the memory 112 and executable on the at least one processor 111, wherein the processor 111 implements the steps executed by the controller in any of the above cooling fan control method embodiments when executing the computer program 113.

[0127] The processor 111 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.

[0128] In some embodiments, the memory 112 may be an internal storage unit of the controller 110, such as a hard disk or memory of the controller 110. In other embodiments, the memory 112 may also be an external storage device of the controller 110, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the controller 110. Further, the controller 110 may also include both an internal storage unit of the controller 110 and an external storage device. The memory 112 is used to store an operating system, an application program, a boot loader, data, and other programs, such as the program code of the computer program. The memory 112 may also be used to temporarily store data that has been output or is to be output.

[0129] An embodiment of the present application further provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the steps performed by the baseboard management controller in any of the above cooling fan control method embodiments can be implemented.

[0130] 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 executed by the controller in any of the above cooling fan control method embodiments.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] 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.

[0135] 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.

[0136] 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: A controller for a vehicle cooling fan, the method comprising: When it is detected that the altitude of the vehicle driving position is higher than or equal to a first altitude threshold, determining an engagement rate of the cooling fan; If the meshing rate is greater than a preset meshing rate value, determining a control parameter corresponding to the altitude of the driving position; controlling the speed of the cooling fan according to the control parameter; The determining of the control parameter corresponding to the altitude of the driving position includes: The control parameters corresponding to the altitude of the driving position are determined according to a pre-stored relationship table, wherein the control parameters are a proportional control parameter and an integral control parameter of the vehicle cooling fan, the relationship table includes at least one altitude interval and a control parameter corresponding to each altitude interval, the control parameter corresponding to the first altitude interval is greater than the control parameter corresponding to the second altitude interval, the maximum height of the first altitude interval is greater than the maximum height of the second altitude interval, and the higher the altitude corresponding to the altitude interval, the greater the corresponding control parameter.

2. The cooling fan control method according to claim 1, wherein: Before determining the control parameter corresponding to the altitude of the driving position according to the pre-stored relationship table, the method further includes: determining at least one altitude interval according to a preset altitude interval; For each of the altitude intervals, obtaining a first target control parameter when the vehicle is traveling in the altitude interval, wherein the first target control parameter is a control parameter corresponding to controlling the meshing rate of the vehicle cooling fan to be a preset meshing rate value; Generate the relationship table according to each of the altitude intervals and the first target control parameters corresponding to each of the altitude intervals; Correspondingly, determining the control parameter corresponding to the altitude of the driving position according to the pre-stored relationship table includes: A first target control parameter corresponding to the altitude of the driving position is determined according to a pre-stored relationship table, and the first target control parameter is used as the control parameter corresponding to the altitude of the driving position.

3. The cooling fan control method according to claim 1, wherein: Before determining the control parameter corresponding to the altitude of the driving position according to the pre-stored relationship table, the method further includes: determining at least one altitude interval according to a preset altitude interval; For each of the altitude intervals, a second target control parameter when the vehicle is traveling in the altitude interval is obtained, wherein the second target control parameter is a control parameter corresponding to when the meshing rate of the vehicle cooling fan is controlled to be a preset meshing rate value according to the initial control parameter, and the initial control parameter is a control parameter corresponding to when the meshing rate of the vehicle cooling fan is controlled to be a preset meshing rate value when the altitude of the vehicle driving position is lower than the first altitude threshold; Generate the relationship table according to each of the altitude intervals and the second target control parameters corresponding to each of the altitude intervals; Correspondingly, determining the control parameter corresponding to the altitude of the driving position according to the pre-stored relationship table includes: A second target control parameter corresponding to the altitude of the driving position is determined according to a pre-stored relationship table, and the second target control parameter is used as the control parameter corresponding to the altitude of the driving position.

4. The cooling fan control method according to claim 2, wherein: The step of obtaining, for each altitude interval, a first target control parameter when the vehicle travels within the altitude interval includes: Determine the air pressure parameter corresponding to each altitude interval; For each of the air pressure parameters, a first target control parameter corresponding to the vehicle traveling under the condition of the air pressure parameter is determined.

5. The cooling fan control method according to claim 3, wherein: The controlling the speed of the cooling fan according to the control parameter comprises: Obtaining a modified control parameter according to the product of the control parameter and the initial control parameter; The rotation speed of the cooling fan is controlled according to the corrected control parameter.

6. The cooling fan control method according to claim 1, wherein: Also includes: Obtaining an air pressure value monitored by a vehicle controller, wherein the air pressure value is measured by a pressure sensor of the vehicle; If it is determined that the air pressure value is greater than or equal to a preset air pressure parameter value, then it is determined that the altitude of the vehicle driving position is lower than or equal to a first altitude threshold, and the preset air pressure parameter value is the atmospheric pressure value of the first altitude threshold area.

7. The cooling fan control method according to claim 1, wherein: Also includes: Receiving the driving position parameters of the vehicle sent by the vehicle controller, wherein the driving position parameters are satellite positioning position information or Beidou positioning position information; If it is determined that the vehicle is traveling in a preset altitude area according to the satellite positioning position information or the Beidou positioning position information, it is determined that the altitude of the vehicle's driving position is higher than or equal to a first altitude threshold, wherein the altitude of the preset altitude area is the first altitude threshold.

8. A cooling fan control device, characterized in that: The device comprises: a detection module, configured to determine an engagement rate of the cooling fan when it is detected that the altitude of the vehicle driving position is higher than or equal to a first altitude threshold; a determination module, configured to determine a control parameter corresponding to the altitude of the driving position if the engagement rate is greater than a preset engagement rate value; A control module, used to control the speed of the cooling fan according to the control parameter; Among them, determining the control parameters corresponding to the altitude of the driving position includes: determining the control parameters corresponding to the altitude of the driving position according to a pre-stored relationship table, the control parameters are proportional control parameters and integral control parameters of the vehicle cooling fan, the relationship table includes at least one altitude interval and the control parameters corresponding to each altitude interval, the control parameter corresponding to the first altitude interval is greater than the control parameter corresponding to the second altitude interval, the maximum height of the first altitude interval is greater than the maximum height of the second altitude interval, and the higher the altitude corresponding to the altitude interval, the larger the corresponding control parameter.

9. A controller, 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 7 when executing the computer program.

10. A vehicle, characterized in that: The vehicle controls the silicone oil fan clutch by the method described in any one of claims 1-7.

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