Silicone oil fan control method, device, vehicle and storage medium

Abstract

The present application provides a control method, device, vehicle and storage medium for a silicone oil fan, which is applied to the field of vehicles. The silicone oil fan is configured in a hybrid vehicle. The method includes: obtaining the engine parameters of the vehicle, the driving parameters of the vehicle and the first required speed of the control unit of the vehicle, the first required speed including the speed of the silicone oil fan required by the control unit in the power system of the vehicle; based on the engine parameters, the driving parameters and the first required speed of the control unit, determining the target required speed of the silicone oil fan, the target required speed is the required speed that matches the current working condition of the vehicle, and the engine parameters are used to describe the state of the engine during operation; adjusting the current speed of the silicone oil fan to the target required speed. The method can select a silicone oil fan speed that meets the heat dissipation requirements of multiple components at the same time when multiple components in the vehicle need silicone oil fan heat dissipation at the same time, so as to achieve the heat dissipation requirements of the vehicle.

Description

Technical Field

[0001] The present application relates to the field of vehicles, and more specifically, to a control method, device, vehicle and storage medium for a silicone oil fan in the field of vehicles. Background Art

[0002] When a vehicle is in operation, multiple components of the vehicle will generate heat. To prevent the multiple components from generating too much heat and causing damage to the components, the vehicle needs to be cooled. Silicone oil fans can provide cooling services for the vehicle according to the vehicle's cooling needs. For example, when the engine, power battery or motor of a hybrid vehicle is in operation, the silicone oil fan can cool the engine, power battery or motor of the hybrid vehicle.

[0003] In the related art, the speed of the silicone oil fan is adjusted according to the operating parameters of the vehicle's engine and the vehicle's air conditioning parameters. However, in actual applications, in addition to the vehicle's engine and the vehicle's air conditioning, other components of the vehicle also need silicone oil fans for heat dissipation. Therefore, the silicone oil fan cannot be accurately controlled based on the heat dissipation requirements of different components, and the temperature of other components cannot be reduced, and the heat dissipation requirements of the vehicle cannot be met. Summary of the invention

[0004] The present application provides a control method, device, vehicle and storage medium for a silicone oil fan. The method can select a silicone oil fan speed that simultaneously meets the heat dissipation requirements of multiple components in a vehicle when multiple components in the vehicle simultaneously require silicone oil fan heat dissipation, so as to achieve the vehicle heat dissipation requirements.

[0005] In a first aspect, a control method for a silicone oil fan is provided, wherein the silicone oil fan is configured in a hybrid vehicle, the method comprising:

[0006] Acquire engine parameters of a vehicle, driving parameters of the vehicle, and a first required speed of a control unit of the vehicle, where the first required speed includes a speed of a silicone oil fan required by a control unit in a power system of the vehicle;

[0007] Based on the engine parameter, the driving parameter and the first required speed of the control unit, determining a target required speed of the silicone oil fan, the target required speed being a required speed matching the current working condition of the vehicle, the engine parameter being used to describe the state of the engine during operation;

[0008] The current speed of the silicone oil fan is adjusted to the target required speed.

[0009] Through the above technical solution, the method can obtain engine parameters, driving parameters of the vehicle and the first required speed of the control unit of the vehicle. The first required speed includes the speed of the silicone oil fan required by the control unit in the power system of the vehicle. The target required speed of the silicone oil fan is determined based on the engine parameters, driving parameters and the first required speed of the control unit. The target required speed is the required speed that matches the current working condition of the vehicle. The engine parameters are used to describe the state of the engine during operation. That is, when multiple components in the vehicle have required speeds, the maximum required speed is determined as the target required speed, and the current speed of the silicone oil fan is adjusted to the target required speed to increase the heat dissipation capacity of the silicone oil fan, so that the silicone oil fan can bring good heat dissipation effect to multiple components in the vehicle.

[0010] In combination with the first aspect, in some possible implementations, the engine parameter includes an engine water temperature, an actual engine intake temperature, and a transmission oil temperature, the driving parameter includes a vehicle speed, and determining a target required speed of the silicone oil fan based on the engine parameter, the driving parameter, and a first required speed of the control unit includes:

[0011] Based on the engine water temperature and vehicle speed, determining a second required speed of the silicone oil fan;

[0012] Determining a third required speed of the silicone oil fan based on an actual intake temperature of the engine, a deviation between the actual intake temperature of the engine and a target intake temperature of the engine, and the vehicle speed;

[0013] Based on the gearbox oil temperature, determining a fourth required speed of the silicone oil fan;

[0014] The largest required speed among the first required speed, the second required speed, the third required speed and the fourth required speed is determined as the target required speed of the silicone oil fan.

[0015] Through the above technical solution, when multiple components of the vehicle have heat dissipation requirements, the method can determine the maximum required speed of the silicone oil fan among the required speeds of multiple components as the target required speed of the silicone oil fan to meet all heat dissipation requirements of the vehicle.

[0016] In combination with the first aspect, in some possible implementations, determining a third required speed of the silicone oil fan based on the actual intake temperature of the engine, a deviation between the actual intake temperature of the engine and a target intake temperature of the engine, and the vehicle speed includes:

[0017] Determining a reference speed of the silicone oil fan based on an actual intake temperature of the engine and a deviation between the actual intake temperature of the engine and a target intake temperature of the engine;

[0018] Determining a first correction coefficient based on a deviation between an actual intake air temperature of the engine and a target intake air temperature of the engine and the vehicle speed;

[0019] The reference rotation speed is multiplied by the first correction coefficient to obtain a third required rotation speed of the silicone oil fan.

[0020] Through the above technical scheme, the method can determine the reference speed of the silicone oil fan based on the actual intake temperature of the engine and the deviation value between the actual intake temperature of the engine and the target intake temperature of the engine; determine the first correction coefficient based on the deviation value between the actual intake temperature of the engine and the target intake temperature of the engine and the vehicle speed; multiply the reference speed by the first correction coefficient to obtain the third required speed of the silicone oil fan, which not only takes into account the reference speed of the silicone oil fan required by the engine, but also takes into account the influence of the vehicle speed on the engine. In this case, the accuracy of the third required speed of the silicone oil fan is higher.

[0021] In combination with the first aspect, in some possible implementations, adjusting the current rotation speed of the silicone oil fan to the target required rotation speed includes:

[0022] Get the actual engine speed and the current speed of the silicone oil fan;

[0023] Determining a basic amount of silicone oil for the silicone oil fan based on the actual speed of the engine and the target required speed;

[0024] Based on the actual speed of the engine, the target required speed and the current speed of the silicone oil fan, determining a first control parameter of the target required speed, the first control parameter being used to correct an error of the target required speed;

[0025] Correcting the basic silicone oil amount based on the first control parameter to obtain a target silicone oil amount of the silicone oil fan;

[0026] Based on the target silicone oil amount of the silicone oil fan, the current rotation speed of the silicone oil fan is adjusted to the target required rotation speed.

[0027] Through the above technical scheme, since the first control parameter is used to correct the error of the target required speed, the basic silicone oil amount is corrected based on the first control parameter to obtain the target silicone oil amount of the silicone oil fan; based on the target silicone oil amount of the silicone oil fan, the current speed of the silicone oil fan is adjusted to the target required speed, thereby meeting the heat dissipation requirements of the vehicle.

[0028] In conjunction with the first aspect, in some possible implementations, the vehicle driving parameters include an accelerator pedal opening, a vehicle speed, and a gear position, the engine parameters include an actual engine speed, and the method further includes:

[0029] When the sound wave function of the vehicle is activated, the sound wave requirement parameter of the silicone oil fan is determined based on the accelerator pedal opening, the vehicle speed, the gear position and the actual engine speed. The sound wave function of the vehicle is used to control the silicone oil fan to create a sound wave sound effect;

[0030] The largest required speed among the first required speed, the second required speed, the third required speed, the fourth required speed and the sound wave requirement parameter of the silicone oil fan is determined as the target required speed of the silicone oil fan.

[0031] Through the above technical solution, when the sound wave function of the vehicle is activated, the gear position of the vehicle is the parking gear or the neutral gear, and the vehicle speed is less than or equal to the preset vehicle speed, the sound wave required speed of the silicone oil fan is determined based on the accelerator pedal opening, the actual engine speed, and the corresponding relationship with the sound wave required parameter. That is, different actual engine speeds correspond to different sound wave required speeds, and the sound wave required speed can meet the demand for creating sound waves at different engine speeds.

[0032] In combination with the first aspect, in some possible implementations, the engine parameter includes an engine water temperature and an actual engine intake temperature, and determining a target required speed of the silicone oil fan based on the engine parameter and the driving parameter includes at least one of the following:

[0033] When the actual speed of the engine is idling, determining the required speed of the engine based on the engine water temperature and the actual intake temperature of the engine; determining the target required speed of the silicone oil fan based on the required speed of the engine and a preset speed ratio between the engine and the silicone oil fan;

[0034] When the actual engine speed is greater than or equal to the preset engine speed, the target required speed of the silicone oil fan is determined based on the actual engine speed and a preset protection speed table between the actual engine speed and the silicone oil fan.

[0035] Through the above technical solution, when the actual engine speed is greater than or equal to the preset engine speed, it is determined that the speed of the silicone oil fan is in the thermal protection zone, and the target required speed of the silicone oil fan is determined from multiple speeds outside the thermal protection zone.

[0036] In combination with the first aspect, in some possible implementations, the driving parameter includes an altitude of the vehicle, the engine parameter includes an actual engine speed, and the method further includes:

[0037] When the altitude of the vehicle is higher than or equal to the first preset altitude and lower than or equal to the second preset altitude, determining a second correction coefficient corresponding to the current altitude of the vehicle based on the altitude of the vehicle;

[0038] Based on the actual speed of the engine, the target required speed and the actual speed of the silicone oil fan, determining a second control parameter of the target required speed, the second control parameter including a proportional control parameter, an integral control parameter and a differential control parameter;

[0039] The target required speed is corrected based on the second correction coefficient and the second control parameter.

[0040] Through the above technical solution, since the second control parameter includes a proportional control parameter, an integral control parameter and a differential control parameter, the target required speed is corrected based on the second correction coefficient and the second control parameter, so that the silicone oil fan can meet the heat dissipation requirements at different altitudes.

[0041] In combination with the first aspect, in some possible implementations, the method further includes:

[0042] When the target required speed is greater than the first target required speed, adjusting the current speed of the silicone oil fan to the first target required speed, the first target required speed being a maximum speed matching the altitude of the vehicle;

[0043] And / or, when the target required speed is less than a second target required speed, the current speed of the silicone oil fan is adjusted to the second target required speed, where the second target required speed is a minimum speed matched according to the current operating condition of the vehicle.

[0044] Through the above technical solution, the target required speed is limited between the first target required speed and the second target required speed, so as to achieve good heat dissipation requirements while avoiding the silicone oil fan's temperature being too high, which may cause the silicone oil in the silicone oil fan to deteriorate, thereby reducing the probability of damage to the silicone oil fan.

[0045] In a second aspect, a control device for a silicone oil fan is provided, the device comprising:

[0046] An acquisition module, used to acquire engine parameters of a vehicle, driving parameters of the vehicle, and a first required speed of a control unit of the vehicle, where the first required speed is a speed of a silicone oil fan required by the control unit;

[0047] a determination module, configured to determine a target required speed of the silicone oil fan based on the engine parameter, the driving parameter, and a first required speed of the control unit, wherein the target required speed is a required speed that matches a current operating condition of the vehicle, and the engine parameter is used to describe a state during engine operation;

[0048] The adjustment module is used to adjust the current rotation speed of the silicone oil fan to a target required rotation speed.

[0049] In a third aspect, a vehicle is provided, comprising a memory and a processor, wherein the memory is used to store executable program codes, and the processor is used to call and run the executable program codes from the memory, so that the vehicle executes the method executed by the control method of the silicone oil fan.

[0050] In a fourth aspect, a computer program product is provided, the computer program product comprising: a computer program code, when the computer program code is run on a computer, the computer executes the method executed by the control method of the silicone oil fan.

[0051] In a fifth aspect, a computer-readable storage medium is provided, which stores a computer program code. When the computer program code runs on a computer, the computer executes the method executed by the control method of the silicone oil fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a schematic diagram of an implementation environment of a control method for a silicone oil fan provided in an embodiment of the present application;

[0053] Figure 2 is a schematic flow chart of a control method for a silicone oil fan provided in an embodiment of the present application;

[0054] Figure 3 is a schematic flow chart of another method for controlling a silicone oil fan provided in an embodiment of the present application;

[0055] Figure 4 This is a schematic diagram of a thermal protection area of ​​a silicone oil fan provided in an embodiment of the present application;

[0056] Figure 5 It is a structural schematic diagram of a control device for a silicone oil fan provided in an embodiment of the present application;

[0057] Figure 6 It is a structural schematic diagram of a vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0058] The technical solution in the present application will be described clearly and in detail below in conjunction with the accompanying drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0059] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as suggesting or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0060] Currently in the vehicle field, many components in the vehicle generate heat during operation. In order to dissipate heat for multiple components in the vehicle, most vehicles are equipped with silicone oil fans. The speed of the silicone oil fan is adjusted by the flow of silicone oil in the silicone oil fan. The silicone oil fan can reduce the temperature of the coolant, thereby achieving the effect of cooling multiple components in the vehicle.

[0061] In the related art, the main components of the silicone oil fan include an actuator, a clutch, a housing, fan blades, a valve, a silicone oil chamber and a driving shaft. Among them, the housing is connected to the fan blades by bolts. There is a labyrinth groove oil circuit structure on the clutch and the housing. The end of the silicone oil fan assembly is directly connected to the front gear train of the engine through a thread. The silicone oil chamber includes an oil storage chamber, a working chamber and a valve to control the flow of silicone oil. The valve can open the oil storage chamber and allow the silicone oil in the oil storage chamber to flow into the clutch oil channel under the action of centrifugal force. When the valve is closed, the residual silicone oil in the oil channel will be scraped back to the oil storage chamber by the oil brush under the action of centrifugal force. The coil in the actuator of the silicone oil fan controls the opening and closing of the valve by suction / disconnection to adjust the silicone oil flowing into the clutch.

[0062] Figure 1 It is a schematic diagram of the implementation environment of a control method for a silicone oil fan provided in an embodiment of the present application.

[0063] For example, Figure 1 As shown, the implementation environment includes a silicone oil fan 110 , an electronic control unit (ECU) 120 , and an engine 130 .

[0064] The silicone oil fan 110 is a cooling fan clutch that uses silicone oil as a medium and transmits torque through the shear viscosity of silicone oil, also known as a silicone oil clutch. Viscous silicone oil is sealed inside the silicone oil fan, and torque is transmitted by the shear viscosity of viscous silicone oil. In some embodiments, the silicone oil fan 110 receives a pulse width modulation signal sent by the electronic control unit 120 to adjust the speed of the silicone oil fan 110. The silicone oil fan 110 is connected to the engine 130 through a fan control harness.

[0065] ECU120 is an important control unit of the vehicle, which can obtain relevant data of the vehicle and control the vehicle to perform corresponding operations based on the relevant data, for example, obtain the required speed of the silicone oil fan 110, and determine whether to control the silicone oil fan 110 to adjust the speed based on the required speed.

[0066] The engine 130 is used to provide power for the vehicle. The engine 130 can send data to 120. For example, the engine 130 can send the speed of the silicone oil fan required by the engine 130 to the ECU 120.

[0067] Figure 2 It is a flow chart of a control method of a silicone oil fan provided in an embodiment of the present application.

[0068] For example, Figure 2 As shown, taking the execution subject as an electronic control unit as an example, the method 200 includes steps 201 to 203.

[0069] Step 201 , obtaining engine parameters of the vehicle, driving parameters of the vehicle and a first required speed of a control unit of the vehicle, wherein the first required speed includes a speed of a silicone oil fan required by a control unit in a power system of the vehicle.

[0070] The engine parameters of the vehicle are used to determine the operating state of the engine. The engine parameters include parameters such as engine water temperature, actual engine intake temperature, and transmission oil temperature. The driving parameters of the vehicle include the vehicle speed.

[0071] The engine water temperature is the temperature of the engine coolant. Based on the engine water temperature, the engine operating status can be monitored. The actual engine intake temperature is the temperature of the air before entering the engine combustion chamber. The actual engine intake temperature is used to monitor the engine combustion efficiency. The transmission oil temperature is the temperature of the lubricating oil in the transmission. Based on the transmission oil temperature, the transmission operating status can be monitored.

[0072] In the case of a hybrid vehicle, the control unit of the vehicle includes a hybrid control unit (HCU). A hybrid vehicle is a car equipped with both a traditional internal combustion engine (such as a gasoline or diesel engine) and an electric motor. The HCU can monitor the operating status of various components in the vehicle. For example, the HCU can monitor the temperature of the power battery in the power system, the temperature of the electric motor, the temperature of the battery, and the operating status of the vehicle air conditioner.

[0073] Silicone oil fan is a cooling component that controls the fan speed by adjusting the amount of silicone oil filled. The viscosity of silicone oil changes with temperature, which enables the silicone oil fan to automatically adjust the fan speed according to the amount of silicone oil.

[0074] It should be understood that when the ECU detects the engine parameters, the ECU will control the silicone oil fan to push the piston of the silicone oil fan to move according to the engine's heat dissipation requirements, adjust the amount of oil in the silicone oil fan, and the silicone oil fan will send the coolant from the engine to the radiator. The coolant transfers the heat in the engine to the radiator, thereby reducing the temperature of the engine coolant, so that the silicone oil fan can dissipate heat from the engine.

[0075] When the silicone oil fan detects the first required speed of the vehicle's control unit, the ECU controls the silicone oil fan to push the piston of the silicone oil fan to move according to the first required speed to adjust the amount of oil in the silicone oil fan. The silicone oil fan blows air through the radiator to take away the heat in the radiator, thereby reducing the temperature of the battery coolant or the motor coolant. The coolant circulates between the battery and the radiator, or the coolant circulates between the motor and the radiator, thereby reducing the temperature of the battery coolant or the motor coolant, so that the silicone oil fan dissipates heat to the components in the vehicle according to the first required speed.

[0076] It should be understood that the end of the silicone oil fan assembly is directly connected to the front gear train of the engine through a thread, so the engine speed will affect the speed of the silicone oil fan. When the ECU detects that the engine temperature has risen, the ECU will move the piston according to the engine's heat dissipation requirements, so that the silicone oil filling amount increases. The speed of the silicone oil fan can be controlled based on the silicone oil filling amount. In this case, obtaining the engine parameters, the vehicle's driving parameters, and the first required speed facilitates the control of the speed of the silicone oil fan.

[0077] The driving parameters of the vehicle are used to determine the driving state of the vehicle. For example, the driving parameters include the vehicle speed. At different vehicle speeds, the engine parameters of the vehicle will be different. Since the engine is connected to the silicone oil fan, obtaining the engine parameters, the driving parameters of the vehicle, and the first required speed of the control unit facilitates the control of the silicone oil fan.

[0078] Step 202, based on the engine parameters, driving parameters and the first required speed of the control unit, determine the target required speed of the silicone oil fan, the target required speed is the required speed that matches the current working condition of the vehicle, and the engine parameters are used to describe the state of the engine during operation.

[0079] The current operating condition of the vehicle is the operating state of the vehicle at the current moment. For example, the current operating condition of the vehicle includes the driving state of the vehicle at the current moment, the altitude of the vehicle at the current moment, and other operating conditions. Different operating conditions of the vehicle at the current moment correspond to different required speeds.

[0080] The target required speed is the maximum required speed of the vehicle under the current working conditions. During the operation of the vehicle, multiple components in the vehicle need to dissipate heat, so multiple components have multiple required speeds, and the target required speed is the maximum required speed among the multiple required speeds.

[0081] For example, multiple components of a vehicle, such as a power battery, an engine, and an onboard air conditioner, all require heat dissipation, so the maximum required speed among multiple required speeds corresponding to the multiple components is determined as the target required speed.

[0082] Step 203, adjusting the current rotation speed of the silicone oil fan to the target required rotation speed.

[0083] It should be understood that during the operation of the vehicle, multiple components of the vehicle require the silicone oil fan to achieve the heat dissipation function. Since the target required speed is the required speed that matches the current working condition of the vehicle, that is, the maximum required speed among multiple required speeds, the current speed of the silicone oil fan is adjusted to the target required speed, so that the silicone oil fan can meet the maximum heat dissipation demand among multiple components in the vehicle, thereby achieving a good heat dissipation effect.

[0084] Since the silicone oil fan adjusts its speed based on the amount of silicone oil, the amount of silicone oil in the silicone oil fan is controlled from the oil storage chamber to the working chamber to increase the amount of silicone oil, thereby adjusting the current speed of the silicone oil fan to the target required speed.

[0085] An embodiment of the present application provides a control method for a silicone oil fan, which can obtain engine parameters, driving parameters of the vehicle, and a first required speed of the control unit of the vehicle. The first required speed includes the speed of the silicone oil fan required by the control unit in the power system of the vehicle. The target required speed of the silicone oil fan is determined based on the engine parameters, driving parameters, and the first required speed of the control unit. The target required speed is the required speed that matches the current working condition of the vehicle. The engine parameters are used to describe the state of the engine during operation. That is, when multiple components in the vehicle have required speeds, the maximum required speed is determined as the target required speed, and the current speed of the silicone oil fan is adjusted to the target required speed to increase the heat dissipation capacity of the silicone oil fan, so that the silicone oil fan can bring good heat dissipation effect to multiple components in the vehicle.

[0086] Figure 3 It is a schematic flow chart of another method for controlling a silicone oil fan provided in an embodiment of the present application.

[0087] It should be noted that the above steps 201-203 are a simple description of a control method for a silicone oil fan provided in an embodiment of the present application. The following will provide a more detailed description of a control method for a silicone oil fan provided in an embodiment of the present application in combination with some examples. Figure 3 Taking the execution subject as an electronic control unit as an example, the method includes the following steps 301 to 304.

[0088] Step 301, obtaining engine parameters of the vehicle, driving parameters of the vehicle and a first required speed of a control unit of the vehicle, wherein the first required speed includes a speed of a silicone oil fan required by a control unit in a power system of the vehicle.

[0089] It should be understood that when a vehicle is driving, multiple components of the vehicle will generate heat, and these multiple components need to be cooled by silicone oil fans. For example, if the vehicle is a hybrid vehicle, the components of the vehicle include batteries and motors. When the vehicle is driving, the engine, power battery, storage battery, motor, air conditioner and other components of the vehicle need to be cooled.

[0090] The vehicle is a hybrid vehicle, and the control unit of the vehicle includes an HCU, which can coordinate the operation of the engine and the motor. The HCU can receive the heat dissipation requirements of each component, and the HCU calculates the first required speed of the silicone oil fan based on the heat dissipation requirements of each component. The HCU sends the first required speed to the ECU to dissipate heat for each component through the first required speed.

[0091] For example, if the motor of the vehicle's power system needs to dissipate heat, the HCU calculates the first required speed of the silicone oil fan based on the motor's heat dissipation requirements. Based on the first required speed, the ECU controls the piston to move, increasing the oil filling amount of the silicone oil clutch, and the silicone oil fan blows air through the radiator, which takes away the heat of the motor coolant to achieve the effect of dissipating heat for the motor.

[0092] The following describes the contents of acquiring the engine parameters of the vehicle, the driving parameters of the vehicle, and the first required speed of the control unit of the vehicle.

[0093] In a possible implementation, the engine parameters are acquired based on engine sensors.

[0094] Among them, engine parameters include engine water temperature, actual engine intake temperature and transmission oil temperature.

[0095] The engine water temperature (engine coolant) is the core part of the engine cooling system. The coolant circulates inside the engine, absorbs energy and releases it into the air through the radiator.

[0096] The actual engine intake temperature refers to the temperature of the air before entering the engine combustion chamber. Too high an intake temperature will result in too little oxygen entering the engine combustion chamber, resulting in reduced engine efficiency and even possible detonation.

[0097] For the transmission, excessively high transmission oil temperature will cause the oil to deteriorate, reduce lubrication effect, increase wear, and even cause transmission failure.

[0098] In some embodiments, an engine sensor for detecting the engine water temperature is installed in a coolant pipe of an engine cooling system. The engine sensor is a thermistor with a negative temperature coefficient. As the engine water temperature increases, the resistance value of the thermistor decreases, thereby being able to obtain the engine water temperature.

[0099] In some embodiments, an engine sensor for detecting the actual intake air temperature of the engine is installed between the air filter and the throttle of the intake system. The engine sensor is a sensor for monitoring temperature. For example, the engine sensor is a thermistor with a negative temperature coefficient. As the intake air temperature of the engine increases, the resistance value of the thermistor decreases, thereby being able to obtain the actual intake air temperature of the engine.

[0100] In this embodiment, the engine parameters are obtained based on the engine sensors, and the operating status of the engine can be monitored in real time to determine whether to dissipate heat for the engine.

[0101] It should be understood that the higher the vehicle speed, the faster the engine speed will be, and the greater the heat dissipation demand of the vehicle. When the vehicle speed is relatively low and the vehicle is in a congested or climbing section, the greater the load on the engine, the higher the engine speed, and the greater the heat dissipation demand of the vehicle, so the silicone oil fan needs to work at a higher speed. In this case, it is necessary to obtain the vehicle speed to determine whether the silicone oil fan is needed to dissipate heat for multiple components of the vehicle.

[0102] In a possible implementation, the vehicle speed of the driving parameter is acquired based on a vehicle speed sensor or a navigation system.

[0103] In some embodiments, the vehicle speed is determined based on pulse signals generated by a plurality of wheel speed sensors and a tire radius.

[0104] In this implementation, the vehicle speed obtained based on the vehicle speed sensor or the navigation system has higher accuracy.

[0105] In a possible implementation, the first required rotation speed of the HCU is acquired based on a controller area network (CAN) bus.

[0106] The CAN bus is a high-speed, real-time, and reliable serial communication protocol used for communication between ECUs and HCUs. The first required speed also includes the speed of the silicone oil fan required by the control unit in the vehicle's power system and the required speed of the silicone oil fan required by the vehicle air conditioner.

[0107] For example, if the motor of the vehicle's power system needs to dissipate heat, the HCU calculates the first required speed of the silicone oil fan based on the motor's heat dissipation requirements. If the vehicle air conditioner needs to dissipate heat, the HCU calculates the first required speed of the silicone oil fan based on the vehicle air conditioner's heat dissipation requirements.

[0108] In some embodiments, the temperature of each component in the vehicle is detected based on a temperature sensor, the heat dissipation requirement of each component is determined based on the temperature of each component, and the heat dissipation requirement of each component is sent to the HCU in the form of a duty cycle. The HCU calculates a first required speed based on the duty cycle, and the HCU sends the first required speed to the ECU.

[0109] Among them, the duty cycle refers to the ratio of the high level (or power-on) time of the signal to the entire cycle time in a pulse cycle, usually expressed as a percentage. The mathematical expression of the duty cycle is:

[0110] Duty cycle = high level time / cycle time × 100%

[0111] In some embodiments, the corresponding relationship between the duty cycle and the rotation speed of the silicone oil fan is 0-100% corresponding to 0-5000 rpm.

[0112] In some embodiments, the HCU sends a confirmation signal to the ECU to confirm that the ECU can communicate with the HCU. If the ECU does not receive the confirmation signal within a first preset time period, the first required speed is determined to be the preset speed.

[0113] The first preset time length is automatically determined by the vehicle controller, or is set by a technician according to actual conditions, and this embodiment of the present application does not limit this. For example, the first preset time length is 10S.

[0114] The preset speed is automatically determined by the vehicle controller or set by the technician according to the actual situation, which is not limited in the present embodiment. For example, the preset speed is 2500 rpm.

[0115] For example, if the confirmation signal is not received in the ECU 10S, it is determined that the first required rotation speed is 2500 rpm.

[0116] It should be understood that if the ECU does not receive a confirmation signal within the first preset time period, the first required speed is adjusted to the preset speed to avoid the heat dissipation demand of the HCU being unmet, thereby avoiding damage to the vehicle components.

[0117] In some embodiments, air conditioning parameters are acquired based on a pressure sensor.

[0118] Among them, the air conditioning parameters include the air conditioning pressure. The pressure sensor is used to monitor the pressure of the vehicle air conditioning. If the silicone oil fan cannot dissipate heat for the vehicle air conditioning, the pressure on the high-pressure side of the vehicle air conditioning will increase. Therefore, the heat dissipation of the vehicle air conditioning can be monitored based on the air conditioning pressure.

[0119] In some embodiments, the pressure sensor is respectively connected to the high-pressure side and low-pressure side interfaces of the vehicle air conditioner to record the pressure value of the vehicle air conditioner.

[0120] In this embodiment, the first required speed of the HCU is acquired based on the CAN bus, so as to control the silicone oil fan based on the first required speed.

[0121] Step 302, based on the engine parameters, the driving parameters and the first required speed of the control unit, determine the target required speed of the silicone oil fan, the target required speed being the required speed that matches the current working condition of the vehicle.

[0122] During the driving process of the vehicle, multiple components of the vehicle need to dissipate heat, so the speed of the silicone oil fan required by each component is different. In this case, in order to simultaneously meet the heat dissipation requirements of multiple components of the vehicle, it is necessary to determine the target required speed of the silicone oil fan based on the engine parameters, driving parameters and the first required speed of the control unit.

[0123] The target required speed is the required speed that matches the current working condition of the vehicle. The engine parameters are used to describe the state of the engine during operation.

[0124] It should be understood that at the same engine speed, when the vehicle is at different altitudes, the speed of the silicone oil fan will also be different due to the different atmospheric pressures of the silicone oil fan. That is, the target required speed is affected by the current working conditions of the vehicle.

[0125] The following describes the content of determining the target required speed of the silicone oil fan based on the engine parameters, the driving parameters and the first required speed of the control unit.

[0126] In one possible implementation, a second required speed of the silicone oil fan is determined based on the engine water temperature and the vehicle speed; a third required speed of the silicone oil fan is determined based on the actual engine intake temperature, the deviation between the actual engine intake temperature and the target engine intake temperature, and the vehicle speed; a fourth required speed of the silicone oil fan is determined based on the transmission oil temperature; and the largest required speed among the first required speed, the second required speed, the third required speed and the fourth required speed is determined as the target required speed of the silicone oil fan.

[0127] The target intake air temperature is the intake air temperature required when the engine operates under ideal conditions.

[0128] The deviation value between the actual intake air temperature of the engine and the target intake air temperature of the engine is used to monitor and adjust the actual intake air temperature of the engine.

[0129] In this embodiment, the second required speed of the silicone oil fan is determined based on the engine water temperature and the vehicle speed, the third required speed of the silicone oil fan is determined based on the actual engine intake temperature, the deviation between the actual engine intake temperature and the target engine intake temperature, and the vehicle speed, the fourth required speed of the silicone oil fan is determined based on the gearbox oil temperature, and the largest required speed among the first required speed, the second required speed, the third required speed, and the fourth required speed is determined as the target required speed of the silicone oil fan. That is, when multiple components of the vehicle have heat dissipation requirements, the largest required speed among the required speeds of the silicone oil fan required by the multiple components is determined as the target required speed of the silicone oil fan to meet all heat dissipation requirements of the vehicle.

[0130] In order to explain the above implementation in more detail, the above implementation is explained in several parts below.

[0131] The first part describes the content of determining the second required speed of the silicone oil fan based on the engine water temperature and the vehicle speed.

[0132] In some possible implementations, the second required speed of the silicone oil fan is determined based on a correspondence table among the engine water temperature, the vehicle speed, and the silicone oil fan.

[0133] Table 1 is a schematic table of different engine water temperatures, vehicle speeds and corresponding second required speeds of the silicone oil fan in an embodiment of the present application.

[0134] Table 1

[0135]

[0136] Exemplarily, as shown in Table 1, the y direction represents the vehicle speed, and the lateral direction represents the engine water temperature. Based on the vehicle speed and the engine water temperature, the required speed of different silicone oil fans can be determined, that is, the x direction represents the second required speed of the silicone oil fan. Since different vehicle speeds affect the engine speed, the faster the vehicle speed, the faster the engine speed, and the higher the engine coolant water temperature, in order to reduce the temperature of the engine coolant, it is necessary to determine the corresponding silicone oil fan speed. It can be seen from Table 1 that when the engine water temperature is 93°C, no matter how much the vehicle speed is, the engine water temperature is low. In this case, the silicone oil fan does not need to dissipate heat for the engine, so the second required speed of the silicone oil fan is 0. When the engine water temperature is between 96°C and 99°C, the vehicle speed has little effect on the engine water temperature, and the engine water temperature is low. In this case, the second required speed of the silicone oil fan is 500 to 700 rpm, which can meet the engine's heat dissipation needs. When the engine water temperature is between 102℃ and 106℃, the engine water temperature is relatively high. At this time, the vehicle speed has a greater impact on the engine water temperature. Therefore, the second required speed of the silicone oil fan increases with the increase of the vehicle speed. When the engine water temperature is between 108℃ and 112℃, the engine water temperature is relatively high. At this time, the second required speed of the silicone oil fan is relatively high. It can be seen from Table 1 that when the engine water temperature is greater than 112℃, in order to avoid engine damage caused by the higher engine water temperature, the silicone oil fan needs to be controlled at the highest second required speed of the silicone oil fan, 4150rpm.

[0137] Since the engine water temperature is obtained by the temperature sensor, when the temperature sensor fails, the engine water temperature cannot be accurately obtained, and the second required speed of the silicone oil fan determined is inaccurate and cannot meet the engine's heat dissipation needs. In this case, in order to avoid engine damage caused by high engine water temperature, the silicone oil fan is controlled to work at the highest second required speed of 4150rpm.

[0138] In this implementation, based on the correspondence table of the engine water temperature, the vehicle speed and the silicone oil fan, the second required speed of the silicone oil fan is determined with high accuracy and can meet the heat dissipation requirements of the engine.

[0139] In the second part, a third required speed of the silicone oil fan is determined based on the actual intake temperature of the engine, the deviation between the actual intake temperature of the engine and the target intake temperature of the engine, and the vehicle speed.

[0140] In one possible implementation, a reference speed of the silicone oil fan is determined based on the actual intake temperature of the engine and the deviation between the actual intake temperature of the engine and the target intake temperature of the engine; a first correction coefficient is determined based on the deviation between the actual intake temperature of the engine and the target intake temperature of the engine and the vehicle speed; and the reference speed is multiplied by the first correction coefficient to obtain a third required speed of the silicone oil fan.

[0141] In some embodiments, the target intake air temperature is calculated as follows:

[0142] Target intake air temperature = (basic target intake air temperature + target intake air temperature correction deviation value) * target correction coefficient.

[0143] The target intake air temperature correction deviation value includes an environment correction deviation value and an air conditioning correction deviation value.

[0144] Since the target intake temperature of the engine is the intake air temperature required when the engine works under ideal conditions, and the target intake temperature affects the fuel efficiency of the engine, in order to obtain an accurate target intake temperature, it is necessary to obtain the engine at different speeds and different engine loads, and determine the basic target intake temperature based on the engine speed and engine load.

[0145] Since the oxygen content in the air is different at different ambient temperatures, it is necessary to determine the environmental correction deviation value of the target intake air temperature for different ambient temperatures. In fuel vehicles, the air conditioner condenser is usually installed in front of the low-temperature radiator. The low-temperature radiator affects the temperature of the coolant, which in turn affects the target intake air temperature. In this case, it is necessary to determine the air conditioning correction deviation value of the target intake air temperature for different air conditioning pressures.

[0146] For different driving modes of the vehicle, the engine speed and vehicle speed are different. In this case, the requirements for the target intake temperature are different, so the target correction coefficient is different. For example, when the vehicle is in standard mode, the engine speed requirement remains unchanged, so in standard mode, the target correction coefficient is 1. If the vehicle is in economic mode, when the vehicle speed is 30km / h, the engine's combustion chamber needs to fully burn the fuel, so sufficient air is required. In this case, the target correction coefficient is determined to be 1.01.

[0147] It should be understood that correcting the target intake air temperature can make the target intake air temperature more consistent with the actual conditions of the vehicle, thereby improving the operating efficiency of the engine.

[0148] It should be understood that since the target intake temperature and the actual intake temperature of the engine affect the operating efficiency of the engine, when the target intake temperature is too high or the actual intake temperature of the engine is too high, the excessively high intake temperature will result in too little oxygen entering the engine combustion chamber, which will lead to reduced engine operating efficiency. Therefore, it is necessary to lower the actual intake temperature of the engine based on a silicone oil fan.

[0149] The following Table 2 is a schematic table of actual intake air temperatures of different engines, vehicle speeds, and corresponding reference speeds of silicone oil fans in an embodiment of the present application.

[0150] Table 2

[0151]

[0152] As shown in Table 2, a represents the actual intake temperature of the engine, and b represents the deviation between the actual intake temperature of the engine and the target intake temperature of the engine. The reference speed of the silicone oil fan is determined based on the actual intake temperature of the engine and the deviation between the actual intake temperature of the engine and the target intake temperature of the engine. It can be understood that, as shown in Table 2, when the actual intake temperature of the engine is less than or equal to 40°C, it means that the actual intake temperature of the engine is low. At this time, the oxygen content in the air is sufficient, so there is no need for the silicone oil fan to dissipate heat for the engine. The deviation between the actual intake temperature of the engine and the target intake temperature of the engine is 0, which means that the oxygen content in the air meets the requirements of the combustion chamber of the engine. Therefore, even if the actual intake temperature of the engine is higher, there is no need for the silicone oil fan to cool the engine. In this case, the reference speed of the silicone oil fan is 0. When the actual intake temperature of the engine is greater than 40°C, the actual intake temperature of the engine is high. If the deviation between the actual intake temperature of the engine and the target intake temperature is higher, it means that the oxygen content in the engine intake is thinner, so the silicone oil fan needs a higher speed. As shown in Table 2, the higher the deviation between the actual intake temperature and the target intake temperature, the higher the reference speed of the silicone oil fan.

[0153] It should be understood that if the actual intake temperature of the engine is higher and the target intake temperature is lower, the intake temperature actually required to be increased is a negative value. If the actual intake temperature of the engine is lower and the target intake temperature is higher, the intake temperature actually required to be increased is a positive value.

[0154] In some embodiments, the intake air temperature actually required to be increased in the combustion chamber of the engine is determined based on a deviation between the actual intake air temperature of the engine and the target intake air temperature of the engine.

[0155] In some embodiments, the first correction coefficient is between 0 and 4. The greater the vehicle speed and the greater the actual intake air temperature that needs to be increased, the greater the first correction coefficient.

[0156] It should be understood that since different vehicle speeds have different requirements for engine speed, the target intake temperatures corresponding to different vehicle speeds are different. In this case, the reference speed of the silicone oil fan is corrected based on the vehicle speed.

[0157] That is, the reference rotation speed is multiplied by the first correction coefficient to obtain the third required rotation speed of the silicone oil fan.

[0158] Under this embodiment, a reference speed of the silicone oil fan is determined based on the actual intake temperature of the engine and the deviation between the actual intake temperature of the engine and the target intake temperature of the engine; a first correction coefficient is determined based on the deviation between the actual intake temperature of the engine and the target intake temperature of the engine and the vehicle speed; the reference speed is multiplied by the first correction coefficient to obtain a third required speed of the silicone oil fan, which takes into account not only the reference speed of the silicone oil fan required by the engine but also the influence of the vehicle speed on the engine. In this case, the accuracy of the obtained third required speed of the silicone oil fan is higher.

[0159] The third part explains the relevant contents of determining the fourth required speed of the silicone oil fan based on the transmission oil temperature.

[0160] In a possible implementation, a telematics control unit (TCU) in the vehicle sends a heat dissipation requirement of the transmission to the ECU. If the ECU does not receive a confirmation signal within a second preset time period, the TCU determines that the fourth required speed is the preset speed.

[0161] The second preset time length is automatically determined by the vehicle controller, or is set by a technician according to actual conditions, and this embodiment of the present application does not limit this. For example, the second preset time length is 10S.

[0162] The preset speed is automatically determined by the vehicle controller or set by the technician according to the actual situation, which is not limited in the present embodiment. For example, the preset speed is 2500 rpm.

[0163] For example, if the confirmation signal is not received in the ECU 10S, it is determined that the fourth required rotation speed is 2500 rpm.

[0164] It should be understood that if the ECU does not receive a confirmation signal within the second preset time period, the fourth required speed is adjusted to the preset speed to meet the heat dissipation requirements of the gearbox, thereby preventing the gearbox from being damaged due to increased temperature.

[0165] It should be understood that excessive transmission oil temperature will cause oil deterioration, reduce lubrication effect, increase wear, and even cause transmission failure. Therefore, ECM can ensure that the transmission oil temperature remains in a relatively safe range by adjusting the speed of the silicone oil fan, extending the service life of the transmission and improving the smoothness of gear shifting.

[0166] In a possible implementation manner, the fourth required speed of the silicone oil fan is determined based on a relationship table corresponding to the transmission oil temperature and the silicone oil fan.

[0167] Table 3 is a schematic table of the fourth required speed of the silicone oil fan corresponding to different gearbox oil temperatures in an embodiment of the present application.

[0168] Table 3

[0169]

[0170] As shown in Table 3, when the gearbox oil temperature is less than 80°C, it means that the gearbox oil temperature is not high, so the gearbox does not need a silicone oil fan for heat dissipation. When the gearbox oil temperature is greater than or equal to 80°C and less than 90°C, it means that the gearbox oil temperature is high. At this time, the gearbox heat dissipation demand is small, so the corresponding required speed of the silicone oil fan is 800 rpm. The higher the gearbox oil temperature, the greater the gearbox heat dissipation demand, and the greater the fourth required speed of the silicone oil fan. If the heat dissipation demand carried in the signal sent by the TCU to the ECU is greater, the fourth required speed of the silicone oil fan will be greater.

[0171] In this implementation, based on the relationship table between the gearbox oil temperature and the silicone oil fan, the fourth required speed of the silicone oil fan is determined, and the fourth required speed of the silicone oil fan that meets the heat dissipation requirement of the gearbox can be obtained.

[0172] In the fourth part, the maximum required speed among the first required speed, the second required speed, the third required speed and the fourth required speed is determined as the target required speed of the silicone oil fan.

[0173] It should be understood that if multiple components in a vehicle need to dissipate heat, then multiple components correspond to multiple required speeds. In order to make the silicone oil fan meet the heat dissipation requirements of all components, the maximum value among the multiple required speeds is taken to determine the target required speed of the silicone oil fan.

[0174] For example, the first required speed is 4120 rpm, the second required speed is 2000 rpm, the third required speed is 1500 rpm, and the fourth required speed is 2500 rpm. The first required speed is the largest, so the first required speed 4120 rpm is determined as the target required speed of the silicone oil fan.

[0175] Optionally, in actual applications, the silicone oil fan will generate sound during operation, and the sound can be attractive to users, so the silicone oil fans of some vehicles also have a required speed corresponding to the sound function.

[0176] The following is an explanation of how to determine the target required speed of the silicone oil fan based on the accelerator pedal opening and the actual engine speed when the sound wave function of the vehicle is activated.

[0177] In one possible implementation, when the sound function of the vehicle is activated, the sound requirement parameters of the silicone oil fan are determined based on the accelerator pedal opening, vehicle speed, gear position and actual engine speed, and the sound function of the vehicle is used to control the silicone oil fan to create sound effects; the first required speed, the second required speed, the third required speed, the fourth required speed and the largest required speed among the sound requirement parameters of the silicone oil fan are determined as the target required speed of the silicone oil fan.

[0178] Among them, the vehicle's sound wave function is used to control the silicone oil fan to create a sound wave effect. The throttle pedal opening is the pedal opening in the driving parameters. The throttle pedal opening is used to monitor the throttle pedal position, and the vehicle's gear position is used to monitor the gearbox.

[0179] The sound wave requirement parameters include the sound wave requirement rotation speed.

[0180] It should be understood that when multiple components of a vehicle need to dissipate heat and the silicone oil fan also needs to create sound effects, in order to meet the vehicle's heat dissipation and sound requirements, the maximum required speed among multiple required speeds and the silicone oil fan's sound requirement parameters is determined as the target required speed of the silicone oil fan.

[0181] In this implementation, when the sound wave function of the vehicle is activated, the sound wave requirement parameters of the silicone oil fan are determined based on the accelerator pedal opening, vehicle speed, gear position and actual engine speed. The sound wave function of the vehicle is used to control the silicone oil fan to create a sound wave sound effect; the first required speed, the second required speed, the third required speed, the fourth required speed and the maximum required speed of the sound wave requirement parameters of the silicone oil fan are determined as the target required speed of the silicone oil fan. That is, when multiple components of the vehicle need to dissipate heat and the silicone oil fan also needs to create a sound wave sound effect, the multiple required speeds and the maximum required speed of the sound wave requirement parameters of the silicone oil fan are determined as the target required speed of the silicone oil fan to meet the heat dissipation and sound wave requirements of the vehicle.

[0182] In order to explain the above implementation in more detail, the above implementation is explained in several parts below.

[0183] The first part explains the contents of determining the required sound parameters of the silicone oil fan based on the accelerator pedal opening, vehicle speed, gear position and actual engine speed when the vehicle's sound function is activated.

[0184] In a possible implementation, when the sound function of the vehicle is activated, the vehicle is in parking or neutral and the vehicle speed is less than or equal to a preset speed, the sound requirement speed of the silicone oil fan is determined based on the accelerator pedal opening, the actual engine speed and the corresponding relationship with the sound requirement parameters.

[0185] It should be understood that in the embodiment of the present application, the preset vehicle speed can be set to zero.

[0186] Table 4 is a schematic table of different accelerator pedal openings, actual engine speeds, and corresponding required speeds for the sound of the silicone oil fan in an embodiment of the present application.

[0187]

[0188] It should be noted that in Table 4, p represents the required speed for sound waves, and q represents the accelerator pedal opening. The contents shown in Table 4 are only used for illustration. In actual application, the values ​​of X, Y, Z1, Z2, Z3, Z4, Z5, Z6, Z7, Z8, Z9, and Z10 can be set according to actual conditions. In addition, the required speeds for sound waves shown in Table 4 are the speeds that the silicone oil fan must have to create a sound wave effect.

[0189] In this case, when the sound wave function of the vehicle is activated, the gear position of the vehicle is the parking gear or the neutral gear, and the vehicle speed is less than or equal to the preset vehicle speed, the sound wave required speed of the silicone oil fan is determined based on the accelerator pedal opening, the actual engine speed, and the corresponding relationship with the sound wave required parameter. That is, different actual engine speeds correspond to different sound wave required speeds, and the sound wave required speed can meet the demand for creating sound waves at different engine speeds.

[0190] The second part describes the content of determining the largest required speed among the first required speed, the second required speed, the third required speed, the fourth required speed and the sound requirement parameter of the silicone oil fan as the target required speed of the silicone oil fan.

[0191] It should be understood that if multiple components in a vehicle need to dissipate heat and the user also needs a silicone oil fan to create sound effects, then multiple components correspond to multiple required speeds. In order to make the silicone oil fan meet the heat dissipation requirements and sound functions of all components, the maximum value among the multiple required speeds is taken to determine the target required speed of the silicone oil fan.

[0192] For example, the first required speed is 4120rpm, the second required speed is 2000rpm, the third required speed is 1500rpm, the fourth required speed is 2500rpm, and the sound wave requirement parameter is 2400rpm. The first required speed is the largest, so the first required speed is determined as the target required speed of the silicone oil fan.

[0193] It should be understood that the end of the silicone oil fan is directly connected to the front gear train of the engine through a thread, and the speed of the silicone oil fan is affected by the speed of the engine. When the vehicle is in an idling state, the engine of the vehicle is working and needs to dissipate heat. However, the speed of the silicone oil fan will decrease as the engine speed decreases, so the silicone oil fan cannot meet the engine heat dissipation. In this case, in order to avoid the above problems, it is necessary to redetermine the target required speed of the silicone oil fan based on the required speed of the engine.

[0194] The following is a description of the content of determining the target required speed of the silicone oil fan when the actual engine speed is idling.

[0195] In one possible implementation, when the actual engine speed is idling, the required engine speed is determined based on the engine water temperature and the actual engine intake temperature; the target required speed of the silicone oil fan is determined based on the required engine speed and a preset speed ratio between the engine and the silicone oil fan.

[0196] The silicone oil fan is a cooling component that controls the fan speed by adjusting the amount of silicone oil filled. The viscosity of silicone oil changes with temperature, which enables the silicone oil fan to automatically adjust the fan speed according to the temperature of the engine.

[0197] The actual engine speed is idle speed, which means the engine is running at a lower speed. Since the end of the silicone oil fan is directly connected to the front gear train of the engine through threads, when the engine is running at a lower speed, the speed of the silicone oil fan is also lower, so the speed of the silicone oil fan cannot meet the cooling needs of the vehicle at all.

[0198] After detecting the engine parameters, the vehicle controller will control the silicone oil fan to push the piston of the silicone oil fan to move according to the engine's cooling requirements, adjust the amount of oil in the silicone oil fan, and the silicone oil fan will blow air through the radiator to take away the heat in the radiator, thereby reducing the temperature of the engine coolant. The coolant circulates between the engine and the radiator, transferring the engine's heat to the radiator, so that the silicone oil fan can dissipate heat from the engine.

[0199] In some embodiments, when the engine's cooling requirements cannot be met, the engine speed is increased to the required speed based on the engine water temperature and the actual engine intake temperature; the target required speed of the silicone oil fan is determined based on the engine's required speed and a preset speed ratio between the engine and the silicone oil fan.

[0200] In this implementation, when the actual engine speed is at idle speed, the required engine speed is determined based on the engine water temperature and the actual engine intake temperature; and the target required speed of the silicone oil fan is determined based on the required engine speed and the preset speed ratio between the engine and the silicone oil fan. When the actual engine speed is at idle speed, the silicone oil fan can meet the heat dissipation demand of the engine.

[0201] In order to explain the above implementation in more detail, the above implementation is explained in several parts below.

[0202] The first part explains how to determine the required engine speed based on the engine water temperature and the actual engine intake temperature when the actual engine speed is idling.

[0203] In a possible implementation, when the actual engine speed is idling, the required engine speed is determined based on a corresponding relationship between the engine water temperature and the required engine speed.

[0204] It should be understood that when the vehicle is in an idling state, the engine continues to generate heat. If the engine water temperature is greater than or equal to the first preset temperature and less than or equal to the third preset temperature for a long period of time, it means that the engine needs a silicone oil fan to dissipate heat at this time to avoid affecting the performance of the engine, so the engine speed needs to be increased to the target speed to increase the speed of the silicone oil fan.

[0205] Table 5 is a schematic table showing the correspondence between different engine water temperatures and the required engine speeds in an embodiment of the present application.

[0206]

[0207] For example, as shown in Table 5 above, when the engine water temperature is 108°C and the duration of the engine water temperature is 2S, the required engine speed is 1100 revolutions per minute (r / min) based on the table above, thereby increasing the required engine speed to 1100 r / min.

[0208] In this embodiment, when the actual engine speed is idling, the required engine speed is determined based on the correspondence between the engine water temperature and the required engine speed to obtain a target required speed of the silicone oil fan that can meet the engine cooling requirements, so that the speed of the silicone oil fan is increased, thereby reducing the engine water temperature.

[0209] It should be understood that when the actual engine speed is idling, the actual engine intake temperature has a greater impact on the engine's operating efficiency, and the engine heat dissipation requirement corresponding to the actual engine intake temperature is greater. Therefore, the required engine speed is determined based on the correspondence between the actual engine intake temperature and the required engine speed.

[0210] In a possible implementation, when the actual engine speed is at idle speed, the required engine speed is determined based on a corresponding relationship between the actual engine intake temperature and the required engine speed.

[0211] Table 6 is a schematic table showing the correspondence between the actual intake temperatures of different engines and the required engine speeds in an embodiment of the present application.

[0212]

[0213] For example, as shown in Table 6 above, when the engine intake temperature is 65°C and the duration of the engine intake temperature is 60S, the required engine speed is 1000 r / min based on the table above, thereby increasing the required engine speed to 1000 r / min.

[0214] When the actual engine speed is idling, the required engine speed is determined based on the corresponding relationship between the actual engine intake temperature and the required engine speed to obtain a target required speed of the silicone oil fan that can meet the engine cooling requirement.

[0215] The second part describes the content of determining the target required speed of the silicone oil fan based on the required speed of the engine and the preset speed ratio between the engine and the silicone oil fan.

[0216] The preset speed ratio refers to the proportional relationship between the speed of the silicone oil fan and the engine speed. The speed calculation formula of the silicone oil fan is as follows.

[0217] Silicone oil fan speed = engine required speed * preset speed ratio

[0218] In some embodiments, the preset speed ratio between the silicone oil fan and the engine is affected by the meshing ratio of the silicone oil fan. The meshing ratio of the silicone oil fan is the contact area between the silicone oil fan and the engine. If the contact area between the silicone oil fan and the engine is small, the speed of the silicone oil fan will be reduced accordingly at the same required speed of the engine.

[0219] It should be understood that the meshing rate of the silicone oil fan can be adjusted by adjusting the design parameters of the silicone oil fan. The embodiment of the present application takes the full meshing of the silicone oil fan as an example to determine the transmission ratio between the silicone oil fan and the engine.

[0220] For example, if the preset speed ratio between the silicone oil fan and the engine is 1.2 and the required speed of the engine is 1000 r / min, the speed of the silicone oil fan is 1200 r / min.

[0221] It should be understood that when the vehicle is idling, the engine continues to generate heat, so the engine's heat dissipation requirements are relatively large. However, since the engine is connected to the silicone oil fan, there is a preset speed ratio between the speed of the silicone oil fan and the speed of the engine. Even if the silicone oil fan is in a fully engaged state, the maximum speed of the silicone oil fan is determined based on the engine speed and the preset speed ratio. Among them, the silicone oil fan in a fully engaged state means that all the silicone oil in the oil storage chamber of the silicone oil fan has entered the working chamber. The oil storage chamber is used to store silicone oil, and the working chamber is used to engage the silicone oil clutch based on silicone oil to increase the speed of the silicone oil fan. When the silicone oil fan is in a fully engaged state, the speed of the silicone oil fan is the largest.

[0222] In this embodiment, the target required speed of the silicone oil fan is determined based on the transmission ratio between the silicone oil fan and the engine and the required speed of the engine; the speed of the silicone oil fan is increased so that the speed of the silicone oil fan meets the heat dissipation requirements of the engine.

[0223] It should be understood that during the operation of the silicone oil fan, the silicone oil flows in the gap between the drive disk and the housing. Due to the viscosity of the silicone oil, the silicone oil generates friction heat during the flow process. The higher the speed of the silicone oil fan, the higher the heat generated by the silicone oil. If the temperature of the silicone oil is too high, it will cause the silicone oil to deteriorate, thereby affecting the performance and life of the silicone oil fan.

[0224] Therefore, in order to avoid the increase in silicone oil temperature caused by the flow of silicone oil, technicians also considered a certain heat dissipation mechanism in the design of silicone oil fans, which can help dissipate the heat generated by friction. Usually, silicone oil fans have an upper temperature limit for heat dissipation, that is, the temperature of the silicone oil cannot exceed this upper temperature limit. If the silicone oil temperature exceeds this upper temperature limit, it will cause the silicone oil fan to overheat, thereby affecting the performance and life of the silicone oil fan, and in severe cases, it may also cause the silicone oil fan to malfunction.

[0225] The following describes the content of determining the target required speed of the silicone oil fan when the actual engine speed is greater than or equal to the preset engine speed.

[0226] In a possible implementation, when the actual engine speed is greater than or equal to a preset engine speed, the target required speed of the silicone oil fan is determined based on the actual engine speed and a preset protection speed table between the actual engine speed and the silicone oil fan.

[0227] Among them, when the actual engine speed is greater than or equal to the preset engine speed, since the silicone oil fan is a component for cooling the engine and the vehicle, the actual engine speed will affect the speed of the silicone oil fan. When the silicone oil fan is working, if the temperature of the silicone oil fan exceeds the upper temperature limit, the silicone oil in the silicone oil fan will deteriorate. Therefore, in order to avoid the temperature of the silicone oil fan exceeding the upper temperature limit, technicians generally pre-set the theoretical thermal protection area of ​​the silicone oil fan. Specifically, when the silicone oil fan works outside the theoretical thermal protection area for a long time, the final theoretical thermal equilibrium point of the silicone oil temperature will not be greater than 230°C; on the contrary, when the silicone oil fan runs in the theoretical thermal protection area for a long time, once the silicone oil temperature is balanced, the silicone oil temperature will exceed the upper temperature limit, which can easily cause the performance of the silicone oil fan to be damaged.

[0228] The preset engine speed is automatically determined by the vehicle controller, or is set by the technician according to the actual situation, and the present application embodiment does not limit this. For example, the preset engine speed is 4300rpm.

[0229] In an embodiment of the present application, when the actual engine speed is greater than or equal to the preset engine speed, the speed of the silicone oil fan is determined to be in the thermal protection zone, and the target required speed of the silicone oil fan is determined from multiple speeds outside the thermal protection zone.

[0230] In order to explain the above implementation in more detail, the above implementation is explained in several parts below.

[0231] The first part explains the thermal protection area of ​​the silicone oil fan.

[0232] For example, Figure 4 As shown, Figure 4 The shaded area is the thermal protection area of ​​the silicone oil fan in the embodiment of the present application.

[0233] Through experiments, technicians found that when the engine speed is 4300rpm, the silicone oil fan will run in the above-mentioned thermal protection area, causing the silicone oil temperature in the silicone oil fan to rise sharply, exceeding the theoretical thermal equilibrium point of the silicone oil. Since the actual speed of the silicone oil fan during operation is adjusted according to the required speed. Therefore, the above-mentioned silicone oil fan is in the thermal protection area, which means that the required speed of the silicone oil fan is in the thermal protection area.

[0234] Based on this, the technicians were able to ensure that the temperature of the silicone oil in the silicone oil fan did not exceed the theoretical thermal equilibrium point when the engine speed exceeded 4300rpm during the experiment, as well as the above 4300rpm and the maximum speed that can be obtained under normal engine conditions ( Figure 1 The above thermal protection area is preset.

[0235] like Figure 1 As shown, the thermal protection area corresponds to four boundary lines, namely the upper boundary line, the lower boundary line, the left boundary line and the right boundary line. In the embodiment of the present application, the left boundary line corresponds to multiple engine speeds greater than or equal to 4300rpm, the right boundary line corresponds to the engine speed of 6000rpm, the upper boundary line corresponds to the fan speed of 4150rpm, and the lower boundary line corresponds to multiple fan speeds. The upper boundary line can be regarded as the "maximum speed line of the thermal protection area", and the lower boundary line can be regarded as the "minimum speed line of the thermal protection area". Among them, the first target required speed of the silicone oil fan is the upper limit of the speed that the silicone oil fan can reach during operation, and the second target required speed of the silicone oil fan is the lower limit of the speed that the silicone oil fan can reach during operation.

[0236] Table 7 is a schematic table of various fan speeds corresponding to a maximum speed line of a thermal protection zone and a minimum speed line of a thermal protection zone provided in an embodiment of the present application.

[0237] Table 7

[0238]

[0239] In addition to the maximum speed line and the minimum speed line corresponding to the thermal protection area, the silicone oil fan also has a maximum speed and a minimum speed. Figure 4 The maximum speed of the fan in the figure is the upper limit of the speed that the silicone oil fan can theoretically reach during operation. The minimum speed (i.e. Figure 4 The minimum fan speed in the figure is the lower limit of the speed that the silicone oil fan can theoretically reach during operation.

[0240] It should be understood that during the operation of the vehicle engine, due to the mechanical connection between the silicone oil fan and the engine, even when the silicone oil fan is in low demand, as long as the engine is running, the silicone oil fan cannot be completely stopped and will rotate with the rotation of the belt between the silicone oil fan and the engine. Therefore, the speed of the silicone oil fan will not completely drop to 0rpm during operation, but will maintain a minimum speed, which is the "minimum speed of the silicone oil fan" (that is, the second target demand speed). In the embodiment of the present application, the minimum speed of the silicone oil fan is set to 200rpm.

[0241] For the maximum speed of the silicone oil fan (that is, the first target required speed), when the engine drives the silicone oil fan to rotate, the maximum speed that the silicone oil fan can reach is different at different engine speeds. In general, due to the mechanical connection between the engine and the silicone oil fan, there is a fixed transmission ratio corresponding to the engine speed and the silicone oil fan speed, which is approximately 1:1.2-1.4, that is, when the engine speed is 1000rpm, the silicone oil fan speed is 1200-1400rpm. However, during the actual vehicle driving process, affected by environmental factors, technicians need to limit the speed of the silicone oil fan in combination with the environmental factors during the actual vehicle operation process to avoid the situation where the silicone oil temperature is high due to the excessively high silicone oil speed. Therefore, in the embodiment of the present application, technicians can recalibrate the maximum speed of the silicone oil fan in combination with various influencing factors.

[0242] It should be understood that at the same engine speed, when the vehicle is at different altitudes, the speed of the silicone oil fan will also be different due to the different atmospheric pressures in which the silicone oil fan is located. In other words, the altitude of the vehicle and the engine speed can affect the speed of the silicone oil fan at the same time.

[0243] Based on this, in an embodiment of the present application, the technician can calibrate the speed of the silicone oil fan at different altitudes and different engine speeds in advance according to the actual driving scenarios of the vehicle, and record it as the "basic speed of the silicone oil fan".

[0244] Table 8 is a schematic table of the rotation speeds of the silicone oil fan corresponding to different altitudes and different engine speeds in an embodiment of the present application.

[0245] Table 8

[0246]

[0247] For example, as shown in Table 8, the influence of different altitudes on the speed of the silicone oil fan is caused by different atmospheric pressures. Therefore, different altitudes are represented by different atmospheric pressures in Table 8. m represents the atmospheric pressure (Kpa) corresponding to different altitudes, and n represents different engine speeds. Table 8 shows the basic speed of the silicone oil fan at different atmospheric pressures and different engine speeds. It can be seen from Table 8 that when the altitude is fixed, the greater the engine speed, the greater the basic speed of the silicone oil fan. This is because an increase in engine speed is usually accompanied by a higher cooling demand, so the speed of the silicone oil fan needs to increase accordingly to adapt to the higher cooling demand.

[0248] It should be understood that at the same altitude, the vehicle may correspond to multiple different vehicle speeds, and different vehicle speeds will also affect the speed of the silicone oil fan. Therefore, in the embodiment of the present application, the vehicle speed can be used as the first influencing factor of the silicone oil fan speed, and the corresponding second correction coefficients at multiple vehicle speeds and multiple altitudes are pre-set, and the speed of the silicone oil fan in Table 8 is corrected according to the second correction coefficient.

[0249] Table 9 is a schematic table of the second correction coefficient of the corresponding silicone oil fan speed at different altitudes and different vehicle speeds provided in an embodiment of the present application.

[0250] Table 9

[0251]

[0252] For example, as shown in Table 9, c represents the atmospheric pressure corresponding to different altitudes, and d represents different vehicle speeds. It can be seen from Table 9 that the second correction coefficient of the silicone oil fan speed is different at different altitudes and different vehicle speeds.

[0253] In addition, at the same engine speed, the road slope of the vehicle is different due to the influence of road factors during the vehicle's driving process. Therefore, in the embodiment of the present application, in addition to correcting the basic speed of the silicone oil fan by the vehicle speed, the slope can also be used as a second influencing factor on the basic speed of the silicone oil fan, and multiple third correction coefficients corresponding to multiple vehicle speeds and multiple altitudes are pre-set, and the basic speed of the silicone oil fan in Table 8 is corrected according to the multiple third correction coefficients.

[0254] Table 10 is a schematic table of the third correction coefficient corresponding to different engine speeds and different slopes provided in an embodiment of the present application.

[0255] Table 10

[0256]

[0257] Exemplarily, as shown in Table 10, x represents different slopes, and y represents different engine speeds. It can be seen from Table 10 that under different slopes and different engine speeds, the third correction coefficient of the first target required speed of the silicone oil fan is also different.

[0258] Based on the second correction coefficient and the third correction coefficient determined at the above-mentioned different altitudes, different engine speeds, different vehicle speeds and different slopes, the basic speed of the silicone oil fan can be corrected to obtain the first target required speed of the silicone oil fan (that is, the maximum speed of the silicone oil fan).

[0259] Specifically, the first target required speed = basic speed ˙ second correction coefficient ˙ third correction coefficient

[0260] In the specific driving process, the vehicle can look up Table 8 to obtain the current basic speed of the silicone oil fan according to the current vehicle engine speed and the current altitude of the vehicle. Further, the current altitude and the current vehicle speed are used to look up Table 9 to obtain the second correction coefficient corresponding to the current basic speed, and the current engine speed and the slope of the road on which the vehicle is currently located are used to obtain the third correction coefficient. Finally, the three are multiplied to obtain the first target required speed under the current driving condition.

[0261] like Figure 4 As shown, the "first target required speed of the silicone oil fan" curve is a curve of the maximum speed of the silicone oil fan at multiple consecutive moments during a certain driving process of the vehicle.

[0262] It should be noted that Figure 4 In the first target required speed curve of the silicone oil fan in , when the engine speed is 5000rpm, the value corresponding to the maximum fan speed (first target required speed) is about 4250rpm, while when the engine speed is 5000rpm as shown in Table 8, the basic speed of the silicone oil fan is only 2300rpm, because the maximum values ​​of the first correction coefficient and the second correction coefficient are both 1. In other words, if the first target required speed of the silicone oil fan is obtained according to the basic speed, the first correction coefficient and the second correction coefficient, it must be less than or equal to 2300rpm, and Figure 4 This is because the basic speed of the silicone oil fan in Table 8 is set lower intentionally by the technicians during the actual vehicle experiment, considering the influence of the thermal protection area, in order to prevent the silicone oil in the silicone oil fan from overheating when the engine speed is high, while 4250rpm is the maximum fan speed under theoretical conditions without considering the influence of the thermal protection area.

[0263] like Figure 4 As shown, the thermal protection zone corresponds to a maximum speed (the first target required speed), called the "maximum speed of the thermal protection zone", which is less than the maximum speed of the silicone oil fan, and its corresponding engine speed is approximately 4300rpm. Similarly, the thermal protection zone corresponds to a minimum speed (the second target required speed), called the "minimum speed of the thermal protection zone", which is greater than the minimum speed of the silicone oil fan.

[0264] In addition, from Figure 4It can also be seen that the thermal protection zone includes an upper boundary line and a lower boundary line. The upper boundary line takes the highest speed of the thermal protection zone as the highest point. As the engine speed increases, the speed of the silicone oil fan shows a downward trend. This boundary line constitutes the "highest speed line of the thermal protection zone". The lower boundary line takes the lowest speed of the thermal protection zone as the lowest point. As the engine speed increases, the speed of the silicone oil fan shows a downward trend. This boundary line constitutes the "lowest speed line of the thermal protection zone".

[0265] The second part explains the contents of determining the target required speed of the silicone oil fan based on the actual engine speed and a preset protection speed table between the actual engine speed and the silicone oil fan when the actual engine speed is greater than or equal to the preset engine speed.

[0266] It should be understood that without considering the working temperature of the silicone oil, the required speed of the silicone oil fan can be directly used as the target required speed of the silicone oil fan. However, if the silicone oil temperature is too high, it will affect the performance of the silicone oil fan. Therefore, in an embodiment of the present application, in order to prevent the working temperature of the silicone oil from exceeding its theoretical thermal equilibrium temperature, a thermal protection zone is pre-set for the silicone oil fan. After the ECM determines the required speed of the silicone oil fan and the engine speed, in order to ensure that the silicone oil fan avoids the thermal protection zone during operation, the ECM needs to first determine whether the required speed of the silicone oil fan is in the thermal protection zone, that is, the preset speed zone.

[0267] For example, the preset engine speed is 4300 rpm.

[0268] When the engine speed is greater than or equal to 4300rpm, the silicone oil fan may be in the thermal protection zone. In other words, when the engine speed is less than 4300rpm, the silicone oil fan does not have the possibility of working in the thermal protection zone. Therefore, the ECM will further determine whether the required speed is in the thermal protection zone only when the engine speed is greater than or equal to 4300rpm.

[0269] The speed of the silicone oil fan is closely related to the engine speed. The reason is that the silicone oil fan is connected to the crankshaft or camshaft of the engine through a belt. The rotation of the engine is transmitted to the silicone oil fan through the belt. Therefore, the speed of the silicone oil fan is directly affected by the engine speed.

[0270] In a possible implementation, when the target required speed is greater than the first target required speed, the current speed of the silicone oil fan is adjusted to the first target required speed, where the first target required speed is a maximum speed that matches the altitude of the vehicle.

[0271] It should be understood that if the target required speed of the silicone oil fan exceeds the maximum speed of the thermal protection zone, the silicone oil in the silicone oil fan may deteriorate. To avoid the above problem, the target required speed needs to be controlled within the thermal protection zone.

[0272] In this implementation, when the target required speed is greater than the first target required speed, the current speed of the silicone oil fan is adjusted to the first target required speed to avoid the silicone oil fan speed being too high, resulting in poor heat dissipation of the silicone oil fan and deterioration of the silicone oil.

[0273] In a possible implementation, when the target required speed is less than a second target required speed, the current speed of the silicone oil fan is adjusted to the second target required speed, where the second target required speed is a minimum speed matched according to the current operating condition of the vehicle.

[0274] It should be understood that during the operation of the vehicle engine, since the silicone oil in the silicone oil fan cannot be completely discharged into the oil storage chamber, and due to the structural relationship between the silicone oil fan and the engine, under low engine demand conditions, as long as the engine is running, the silicone oil fan cannot be completely stopped and will rotate with the rotation of the belt. Therefore, the speed of the silicone oil fan will not completely drop to 0rpm during operation, but will maintain a minimum speed.

[0275] In this implementation, when the target required rotation speed is less than the second target required rotation speed, the current rotation speed of the silicone oil fan is adjusted to the second target required rotation speed to achieve good heat dissipation requirements.

[0276] Step 303: Correct the target required speed based on the actual engine speed and the second control parameter.

[0277] It should be understood that when the vehicle is driving in a plateau environment, due to the low air pressure and low air density in the plateau area, the blade torque of the silicone oil fan is reduced during rotation, resulting in an increase in the full mesh speed of the silicone oil fan, a decrease in slip, a decrease in the clutch return oil pressure, and a decrease in the return oil speed, which causes the silicone oil fan to be difficult to separate and always be in a full mesh speed state. If the silicone oil fan is always in a full mesh speed state, the feedback control of the silicone oil fan will fail or the sensitivity will decrease, resulting in the system being overcooled. To solve the above problems, the target required speed is corrected based on the actual engine speed and the second control parameter.

[0278] In a possible implementation, when the vehicle is located at an altitude higher than or equal to a first preset altitude and lower than or equal to a second preset altitude, a second correction coefficient corresponding to the current altitude of the vehicle is determined based on the vehicle's altitude, and a second control parameter of the target required speed is determined based on the actual engine speed, the target required speed and the actual speed of the silicone oil fan, the second control parameter including a proportional control parameter, an integral control parameter and a differential control parameter; the target required speed is corrected based on the second correction coefficient and the second control parameter.

[0279] Among them, when the altitude of the vehicle is higher than or equal to the first preset altitude and lower than or equal to the second preset altitude, it means that the vehicle is traveling in an area with a higher altitude. The fan of the electronically controlled silicone oil clutch is running in a fully engaged state. Due to the small slip difference, the return oil pressure is reduced, resulting in a decrease in the clutch speed adjustment sensitivity. In order to avoid the above problems, the target required speed at different altitudes is corrected.

[0280] In order to explain the above implementation in more detail, the above implementation is explained in several parts below.

[0281] The first part describes the content of determining a second correction coefficient corresponding to the current altitude of the vehicle based on the altitude of the vehicle when the altitude of the vehicle is higher than or equal to the first preset altitude and lower than or equal to the second preset altitude.

[0282] It can be understood that, based on the altitude of the vehicle, the specific implementation method of determining the second correction factor corresponding to the current altitude of the vehicle can be referred to the contents of the aforementioned Tables 8 and 9, which will not be repeated here.

[0283] The second part determines the second control parameter of the target required speed based on the actual engine speed, the target required speed and the actual speed of the silicone oil fan. The second control parameter includes a proportional control parameter, an integral control parameter and a differential control parameter; and explains the content of correcting the target required speed based on the second correction coefficient and the second control parameter.

[0284] Specifically, in the embodiment of the present application, the ECM controls the rotation speed of the silicone oil fan based on a proportional-integral-derivative (PID) method during the process of controlling the rotation of the silicone oil fan.

[0285] Determine the target proportional coefficient, target integral coefficient and target differential coefficient corresponding to the speed adjustment of the silicone oil fan according to the actual speed of the silicone oil fan, the target required speed and the engine speed;

[0286] Determine a target duty cycle of the silicone oil fan according to a target proportional coefficient, a target integral coefficient, a target differential coefficient, and a basic duty cycle of the silicone oil fan;

[0287] According to the target duty cycle, the operation of the silicone oil fan is controlled so that the speed of the silicone oil fan is adjusted from the actual speed to the target required speed.

[0288] The specific calculation formula of PID is shown in the following formula.

[0289]

[0290] Among them, in the above formula: e(t): speed error, that is, the difference between the target required speed and the actual speed;

[0291] Kp: proportional coefficient P; Kp / Ti: integral coefficient I; Kp·Td: differential coefficient D; u(t): PID output, usually a unitless value.

[0292] When the silicone oil fan is PID-regulated, the second control parameter includes a proportional control parameter, an integral control parameter, and a differential control parameter. During the regulation process, the ECM also needs to be combined with the engine speed.

[0293] Specifically, at any time during the adjustment process, the ECM can obtain the actual speed of the silicone oil fan at the current time through the speed sensor of the silicone oil fan, and calculate the difference between the actual speed and the target required speed, that is, e(t) in formula (1).

[0294] In the embodiment of the present application, technicians can pre-set the proportional coefficient P, integral coefficient I and differential coefficient D corresponding to different engine speeds based on experiments.

[0295] Tables 11-13 are schematic tables of the corresponding relationship between the proportional coefficient P, the integral coefficient I and the differential coefficient D at different engine speeds provided in an embodiment of the present application.

[0296] Table 11

[0297]

[0298] For example, as shown in Table 11, s represents the engine speed, and w represents e(t). Table 9 shows the corresponding proportional coefficient P (×10 -4 ).

[0299] Table 12

[0300]

[0301] For example, as shown in Table 12, s represents the engine speed, and w represents e(t). Table 6 shows the corresponding integral coefficient I (×10 -6 ).

[0302] Table 13

[0303]

[0304] For example, as shown in Table 13, x represents the engine speed, and y represents e(t). Table 11 shows the corresponding differential coefficient D (×10-3 ).

[0305] Therefore, when the ECM performs PID control on the silicone oil fan based on the target required speed and the actual speed, at each adjustment moment, the ECM can obtain the actual speed of the silicone oil fan and the engine speed corresponding to the current adjustment moment, and calculate the difference between the actual speed and the target required speed. Then, according to the difference between the actual speed and the target required speed, as well as the engine speed, by looking up the above Tables 11-13, the proportional control parameters, integral control parameters, and differential control parameters at the adjustment moment are obtained.

[0306] After obtaining the proportional control parameter, the integral control parameter and the differential control parameter, the ECM can calculate the output u(t) of the PID according to the above formula, which is also the second control parameter.

[0307] After calculating the PID output u(t), the ECM can normalize u(t) and convert it into a duty cycle to correct the target demand speed.

[0308] Step 304, adjusting the current rotation speed of the silicone oil fan to the target required rotation speed.

[0309] After obtaining the target required speed of the silicone oil fan, the ECM may control the operation of the silicone oil fan based on the target required speed.

[0310] It should be understood that in actual applications, the rotation speed of the silicone oil fan changes in real time. In order to reduce the real-time error of the silicone oil rotation speed, the target required rotation speed of the silicone oil fan is corrected.

[0311] In one possible implementation, the actual engine speed and the current speed of the silicone oil fan are obtained; based on the actual engine speed and the target required speed, a basic silicone oil amount of the silicone oil fan is determined; based on the actual engine speed, the target required speed and the current speed of the silicone oil fan, a first control parameter of the target required speed is determined, the first control parameter being used to correct the error of the target required speed; based on the first control parameter, the basic silicone oil amount is corrected to obtain a target silicone oil amount for the silicone oil fan; based on the target silicone oil amount of the silicone oil fan, the current speed of the silicone oil fan is adjusted to the target required speed.

[0312] The basic silicone oil volume is a preset silicone oil volume, which refers to the default silicone oil volume of the silicone oil fan without any additional control input. The basic silicone oil volume can provide a reasonable initial state for PID adjustment and is a static silicone oil volume.

[0313] The first control parameter includes a proportional control parameter, an integral control parameter, and a differential control parameter.

[0314] Under this possible implementation mode, since the first control parameter is used to correct the error of the target required speed, the basic silicone oil amount is corrected based on the first control parameter to obtain the target silicone oil amount of the silicone oil fan; based on the target silicone oil amount of the silicone oil fan, the current speed of the silicone oil fan is adjusted to the target required speed, thereby meeting the heat dissipation requirements of the vehicle.

[0315] In order to explain the above implementation in more detail, the above implementation is explained in several parts below.

[0316] The first part describes the content of the first control parameter for determining the target required speed based on the actual engine speed, the target required speed and the current speed of the silicone oil fan.

[0317] It can be understood that the relevant contents of determining the first control parameter of the target required speed can refer to the relevant description of determining the second control parameter in the aforementioned step, which will not be repeated here.

[0318] The first control parameter is based on the proportional control parameter, the integral control parameter and the differential control parameter. The ECM can calculate the output u(t) of the PID according to the above formula.

[0319] The second part describes how to correct the basic silicone oil amount based on the first control parameter to obtain the target silicone oil amount of the silicone oil fan.

[0320] It should be understood that the duty cycle obtained by the normalization of u(t) above is the adjustment duty cycle calculated by the ECM based on the difference between the actual speed of the silicone oil fan and the target required speed at the current adjustment moment. Correspondingly, the silicone oil fan is generally also provided with a base duty cycle (Base Duty Cycle). The base duty cycle is pre-set and refers to the default duty cycle of the silicone oil fan in the absence of any additional control input. The base duty cycle can provide a reasonable initial state for PID regulation and is a static duty cycle, while the adjustment duty cycle is dynamic and will be adjusted according to the real-time speed error. When controlling the silicone oil fan, the duty cycle actually used to control the silicone oil fan is equal to the sum of the base duty cycle and the adjustment duty cycle.

[0321] Specifically, in the embodiment of the present application, the technicians can set up multiple sets of correspondence tables between the engine speed, the target required speed of the silicone oil fan and the basic duty cycle according to the engine speed and the target required speed of the silicone oil fan.

[0322] Table 14 is a schematic table of the correspondence between different engine speeds, different target required speeds and basic duty cycles provided in an embodiment of the present application.

[0323] Table 14

[0324]

[0325] For example, as shown in Table 14, after finding the adjusted duty cycle of the PID output, the ECM can look up Table 14 through the engine speed and the target required speed at the current adjustment time to obtain the basic duty cycle corresponding to the current adjustment time, and add the basic duty cycle and the adjusted duty cycle to obtain the final target duty cycle, that is, the duty cycle actually used to control the silicone oil fan. Finally, the ECM outputs a pulse width modulation (PWM) signal corresponding to the target duty cycle to achieve the effect of adjusting the speed of the silicone oil fan.

[0326] In some embodiments, the ECM determines a target silicone oil amount according to the target duty cycle to control the speed of the silicone oil fan.

[0327] In the third part, based on the target silicone oil amount of the silicone oil fan, the current speed of the silicone oil fan is adjusted to the target required speed.

[0328] In some embodiments, after determining the target silicone oil amount of the silicone oil fan, the ECU controls the valve of the oil storage chamber of the silicone oil fan to open to control the target silicone oil amount to flow into the working chamber of the silicone oil fan, thereby adjusting the speed of the silicone oil fan.

[0329] An embodiment of the present application provides a control method for a silicone oil fan, which can obtain engine parameters, driving parameters of the vehicle, and a first required speed of the control unit of the vehicle, wherein the first required speed includes the speed of the silicone oil fan required by the control unit in the power system of the vehicle. The target required speed of the silicone oil fan is determined based on the engine parameters, driving parameters, and the first required speed of the control unit, and the target required speed is the required speed that matches the current working condition of the vehicle. That is, when multiple components in the vehicle have required speeds, the maximum required speed is determined as the target required speed, and the target required speed is corrected to make the target required speed more accurate, and the current speed of the silicone oil fan is adjusted to the target required speed to increase the heat dissipation capacity of the silicone oil fan, so that the silicone oil fan can bring good heat dissipation effect to multiple components in the vehicle.

[0330] Figure 5 A control device for a silicone oil fan is provided in an embodiment of the present application.

[0331] For example, Figure 5 As shown, the device 500 includes:

[0332] An acquisition module 501 is used to acquire engine parameters of the vehicle, driving parameters of the vehicle and a first required speed of a control unit of the vehicle, where the first required speed includes a speed of a silicone oil fan required by a control unit in a power system of the vehicle;

[0333] A determination module 502 is used to determine a target required speed of the silicone oil fan based on the engine parameters, the driving parameters and the first required speed of the control unit, where the target required speed is a required speed that matches the current working condition of the vehicle, and the engine parameters are used to describe the state of the engine during operation;

[0334] The adjustment module 503 is used to adjust the current rotation speed of the silicone oil fan to the target required rotation speed.

[0335] In a possible implementation manner, the device 500 further includes:

[0336] A determination module 502, configured to determine a second required speed of the silicone oil fan based on the engine water temperature and the vehicle speed;

[0337] A determination module 502, configured to determine a third required speed of the silicone oil fan based on an actual intake air temperature of the engine, a deviation between the actual intake air temperature of the engine and a target intake air temperature of the engine, and a vehicle speed;

[0338] A determination module 502, configured to determine a fourth required speed of the silicone oil fan based on the transmission oil temperature;

[0339] The determination module 502 is used to determine the maximum required speed among the first required speed, the second required speed, the third required speed and the fourth required speed as the target required speed of the silicone oil fan.

[0340] In a possible implementation manner, the device 500 further includes:

[0341] A reference speed determination module is used to determine a reference speed of the silicone oil fan based on an actual intake air temperature of the engine and a deviation value between the actual intake air temperature of the engine and a target intake air temperature of the engine;

[0342] A correction coefficient determination module, configured to determine a first correction coefficient based on a deviation between an actual engine intake temperature and a target engine intake temperature and a vehicle speed;

[0343] The multiplication module is used to multiply the reference rotation speed by the first correction coefficient to obtain a third required rotation speed of the silicone oil fan.

[0344] In a possible implementation manner, the device 500 further includes:

[0345] An acquisition module is used to obtain the actual engine speed and the current speed of the silicone oil fan;

[0346] A module for determining the amount of silicone oil, used to determine the basic amount of silicone oil for the silicone oil fan based on the actual engine speed and the target required speed;

[0347] A control parameter determination module, used to determine a first control parameter of the target required speed based on the actual engine speed, the target required speed and the current speed of the silicone oil fan, wherein the first control parameter is used to correct an error of the target required speed;

[0348] A correction module, used for correcting the basic silicone oil amount based on the first control parameter to obtain a target silicone oil amount of the silicone oil fan;

[0349] The adjustment module 503 is used to adjust the current rotation speed of the silicone oil fan to the target required rotation speed based on the target silicone oil amount of the silicone oil fan.

[0350] In a possible implementation manner, the device 500 further includes:

[0351] A module for determining the sound wave requirement parameters is used to determine the sound wave requirement parameters of the silicone oil fan based on the accelerator pedal opening, vehicle speed, gear position and actual engine speed when the sound wave function of the vehicle is activated. The sound wave function of the vehicle is used to control the silicone oil fan to create a sound wave sound effect;

[0352] The determination module 502 is used to determine the largest required speed among the first required speed, the second required speed, the third required speed, the fourth required speed and the sound wave requirement parameter of the silicone oil fan as the target required speed of the silicone oil fan.

[0353] In a possible implementation manner, the device 500 further includes:

[0354] The determination module 502 is used to determine the required speed of the engine based on the engine water temperature and the actual engine intake temperature when the actual engine speed is idle; determine the target required speed of the silicone oil fan based on the required speed of the engine and a preset speed ratio between the engine and the silicone oil fan;

[0355] The determination module 502 is used to determine the target required speed of the silicone oil fan based on the actual engine speed and a preset protection speed table between the actual engine speed and the silicone oil fan when the actual engine speed is greater than or equal to the preset engine speed.

[0356] In a possible implementation manner, the device 500 further includes:

[0357] A correction coefficient determination module, configured to determine a second correction coefficient corresponding to the current altitude of the vehicle based on the altitude of the vehicle when the altitude of the vehicle is higher than or equal to the first preset altitude and lower than or equal to the second preset altitude;

[0358] A correction coefficient determination module is used to determine a second control parameter of the target required speed based on the actual engine speed, the target required speed and the actual speed of the silicone oil fan, the second control parameter including a proportional control parameter, an integral control parameter and a differential control parameter;

[0359] The correction module is used to correct the target required rotation speed based on the second correction coefficient and the second control parameter.

[0360] In a possible implementation manner, the device 500 further includes:

[0361] An adjustment module 503 is used to adjust the current speed of the silicone oil fan to the first target required speed when the target required speed is greater than the first target required speed, where the first target required speed is a maximum speed that matches the altitude of the vehicle;

[0362] The adjustment module 503 is used to adjust the current speed of the silicone oil fan to the second target required speed when the target required speed is less than the second target required speed. The second target required speed is the minimum speed matched according to the current working condition of the vehicle.

[0363] Figure 6 It is a structural schematic diagram of a vehicle provided in an embodiment of the present application.

[0364] For example, Figure 6 As shown, the vehicle 600 includes: a memory 601 and a processor 602, wherein the memory 601 stores an executable program code 6011, and the processor 602 is used to call and execute the executable program code 603 to perform a control method for a silicone oil fan.

[0365] In addition, an embodiment of the present application also protects a device, which may include a memory and a processor, wherein the memory stores an executable program code, and the processor is used to call and execute the executable program code to execute a control method for a silicone oil fan provided in an embodiment of the present application.

[0366] In this embodiment, the functional modules of the device can be divided according to the above method example. For example, each functional module can be corresponded, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware. It should be noted that the division of modules in this embodiment is schematic and is only a logical function division. There may be other division methods in actual implementation.

[0367] In the case of dividing each functional module according to each function, the device may also include a correction coefficient determination module, a correction module, and a silicone oil amount determination module, etc. It should be noted that all relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module, which will not be repeated here.

[0368] It should be understood that the device provided in this embodiment is used to execute the above-mentioned control method of a silicone oil fan, and thus can achieve the same effect as the above-mentioned implementation method.

[0369] In the case of an integrated unit, the device may include a processing module and a storage module. When the device is applied to a vehicle, the processing module may be used to control and manage the actions of the vehicle. The storage module may be used to support the vehicle in executing related program codes, etc.

[0370] The processing module may be a processor or a controller, which may implement or execute various exemplary logic blocks, modules and circuits shown in combination with the contents disclosed in this application. The processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of digital signal processing (DSP) and a microprocessor, etc. The storage module may be a memory.

[0371] In addition, the device provided in the embodiments of the present application may specifically be a chip, a component or a module, and the chip may include a connected processor and a memory; wherein the memory is used to store instructions, and when the processor calls and executes the instructions, the chip can execute a control method for a silicone oil fan provided in the above embodiments.

[0372] This embodiment also provides a computer-readable storage medium, in which a computer program code is stored. When the computer program code is executed on a computer, the computer executes the above-mentioned related method steps to implement a control method for a silicone oil fan provided in the above embodiment.

[0373] This embodiment further provides a computer program product. When the computer program product is run on a computer, the computer is caused to execute the above-mentioned related steps to implement a control method for a silicone oil fan provided in the above embodiment.

[0374] Among them, the device, computer-readable storage medium, computer program product or chip provided in this embodiment is used to execute the corresponding method provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding method provided above, and will not be repeated here.

[0375] Through the description of the above implementation methods, technical personnel in the relevant field can understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0376] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, 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.

[0377] The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A control method for a silicone oil fan, characterized in that: The silicone oil fan is configured in a hybrid vehicle, and the method comprises: Acquiring engine parameters of a vehicle, driving parameters of the vehicle, and a first required speed of a control unit of the vehicle, wherein the first required speed includes a speed of a silicone oil fan required by the control unit in a power system of the vehicle; Based on the engine parameter, the driving parameter and the first required speed of the control unit, determining a target required speed of the silicone oil fan, wherein the target required speed is a required speed that matches the current working condition of the vehicle, the engine parameter is used to describe the state of the engine during operation; the engine parameter includes an engine water temperature, an actual engine intake temperature and a transmission oil temperature, and the driving parameter includes a vehicle speed; The determining the target required speed of the silicone oil fan based on the engine parameter, the driving parameter and the first required speed of the control unit includes: Determining a second required speed of the silicone oil fan based on the engine water temperature and the vehicle speed; determining a third required speed of the silicone oil fan based on the actual intake temperature of the engine, a deviation between the actual intake temperature of the engine and a target intake temperature of the engine, and the vehicle speed; Based on the gearbox oil temperature, determining a fourth required speed of the silicone oil fan; Determine the largest required speed among the first required speed, the second required speed, the third required speed, and the fourth required speed as the target required speed of the silicone oil fan; The determining the third required speed of the silicone oil fan based on the actual intake temperature of the engine, the deviation between the actual intake temperature of the engine and the target intake temperature of the engine, and the vehicle speed includes: Determining a reference speed of the silicone oil fan based on the actual intake temperature of the engine and a deviation value between the actual intake temperature of the engine and a target intake temperature of the engine; determining a first correction coefficient based on a deviation between the actual intake air temperature of the engine and the target intake air temperature of the engine and the vehicle speed; Multiplying the reference speed by the first correction coefficient to obtain a third required speed of the silicone oil fan; The current rotation speed of the silicone oil fan is adjusted to the target required rotation speed.

2. The method according to claim 1, characterized in that: The step of adjusting the current rotation speed of the silicone oil fan to a target required rotation speed includes: Obtaining the actual engine speed and the current speed of the silicone oil fan; Determining a basic amount of silicone oil for the silicone oil fan based on the actual engine speed and the target required speed; Determining a first control parameter of the target required speed based on the actual engine speed, the target required speed and the current speed of the silicone oil fan, wherein the first control parameter is used to correct an error of the target required speed; Correcting the basic silicone oil amount based on the first control parameter to obtain a target silicone oil amount for the silicone oil fan; Based on the target silicone oil amount of the silicone oil fan, the current rotation speed of the silicone oil fan is adjusted to the target required rotation speed.

3. The method according to claim 1, characterized in that The vehicle driving parameters include accelerator pedal opening, vehicle speed and gear position, the engine parameters include actual engine speed, and the method further includes: When the sound wave function of the vehicle is activated, the sound wave requirement parameter of the silicone oil fan is determined based on the accelerator pedal opening, the vehicle speed, the gear position and the actual engine speed, and the sound wave function of the vehicle is used to control the silicone oil fan to create a sound wave sound effect; The largest required speed among the first required speed, the second required speed, the third required speed, the fourth required speed and the sound wave requirement parameter of the silicone oil fan is determined as the target required speed of the silicone oil fan.

4. The method according to claim 1, characterized in that: The engine parameters include the engine water temperature and the actual engine intake temperature. The determining the target required speed of the silicone oil fan based on the engine parameters and the driving parameters includes at least one of the following: When the actual engine speed is idling, determining the required engine speed based on the engine water temperature and the actual engine intake temperature; determining the target required engine speed of the silicone oil fan based on the required engine speed and a preset speed ratio between the engine and the silicone oil fan; When the actual engine speed is greater than or equal to a preset engine speed, the target required speed of the silicone oil fan is determined based on the actual engine speed and a preset protection speed table between the actual engine speed and the silicone oil fan.

5. The method according to claim 1, characterized in that The driving parameter includes the altitude of the vehicle, the engine parameter includes the actual engine speed, and the method further includes: When the altitude of the vehicle is higher than or equal to the first preset altitude and lower than or equal to the second preset altitude, determining a second correction coefficient corresponding to the current altitude of the vehicle based on the altitude of the vehicle; Determining a second control parameter of the target required speed based on the actual engine speed, the target required speed and the actual speed of the silicone oil fan, wherein the second control parameter includes a proportional control parameter, an integral control parameter and a differential control parameter; The target required speed is corrected based on the second correction coefficient and the second control parameter.

6. The method according to claim 1, characterized in that The method further comprises: When the target required speed is greater than a first target required speed, adjusting the current speed of the silicone oil fan to the first target required speed, wherein the first target required speed is a maximum speed matching the altitude of the vehicle; And / or, when the target required speed is less than a second target required speed, the current speed of the silicone oil fan is adjusted to the second target required speed, where the second target required speed is a minimum speed matched according to the current operating condition of the vehicle.

7. A control device for a silicone oil fan, characterized in that: The device comprises: An acquisition module, used to acquire engine parameters of a vehicle, driving parameters of the vehicle, and a first required speed of a control unit of the vehicle, wherein the first required speed includes a speed of a silicone oil fan required by the control unit in a power system of the vehicle; a determination module, for determining a target required speed of the silicone oil fan based on the engine parameters, the driving parameters and the first required speed of the control unit, the target required speed being a required speed matching the current working condition of the vehicle, the engine parameters being used to describe the state of the engine during operation, the engine parameters including the engine water temperature, the actual engine intake temperature and the gearbox oil temperature, and the driving parameters including the vehicle speed; determining a second required speed of the silicone oil fan based on the engine water temperature and the vehicle speed; determining a second required speed of the silicone oil fan based on the actual engine intake temperature, the deviation between the actual engine intake temperature and the target engine intake temperature and the vehicle speed. a third required speed; based on the transmission oil temperature, determining a fourth required speed of the silicone oil fan; determining the largest required speed among the first required speed, the second required speed, the third required speed and the fourth required speed as the target required speed of the silicone oil fan; determining a reference speed of the silicone oil fan based on the actual intake temperature of the engine and the deviation between the actual intake temperature of the engine and the target intake temperature of the engine; determining a first correction coefficient based on the deviation between the actual intake temperature of the engine and the target intake temperature of the engine and the vehicle speed; multiplying the reference speed by the first correction coefficient to obtain the third required speed of the silicone oil fan; The adjustment module is used to adjust the current rotation speed of the silicone oil fan to a target required rotation speed.

8. A vehicle, characterized in that: The vehicle comprises: A memory for storing executable program codes; A processor, configured to call and run the executable program code from the memory, so that the vehicle executes the method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed, the method according to any one of claims 1 to 6 is implemented.

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