Control method and device of silicone oil fan, vehicle and storage medium

Abstract

The invention provides a control method and device for a silicone oil fan, a vehicle and a storage medium, the method is applied to the field of vehicles, the silicone oil fan is arranged in a hybrid vehicle, and the method comprises the steps that engine parameters of the vehicle, driving parameters of the vehicle and a first required rotating speed of a control unit of the vehicle are obtained, the first required rotating speed comprises the rotating speed of a silicone oil fan required by a control unit in a power system of the vehicle; based on the engine parameters, the driving parameters and the first required rotating speed of the control unit, the target required rotating speed of the silicone oil fan is determined, the target required rotating speed is the required rotating speed matched with the current working condition of the vehicle, and the engine parameters are used for describing the state of the engine in the running process; and adjusting the current rotating speed of the silicone oil fan to the target required rotating speed. According to the method, under the condition that multiple assemblies in the vehicle need silicone oil fan heat dissipation at the same time, the silicone oil fan rotating speed meeting the heat dissipation requirements of the multiple assemblies at the same time can be selected so as to meet the vehicle heat dissipation requirements.

Description

Technical Field

[0001] This application relates to the field of vehicles, and more specifically, to a method, apparatus, vehicle, and storage medium for controlling a silicone oil fan in the field of vehicles. Background Art

[0002] When a vehicle is in operation, multiple components generate heat. To prevent excessive heat from damaging these components, cooling is necessary. Silicone oil fans can provide cooling services based on the vehicle's cooling requirements. For example, in hybrid vehicles, when the engine, battery, or electric motor is operating, a silicone oil fan can cool these components.

[0003] In related technologies, the speed of the silicone oil fan is adjusted based on the operating parameters of the vehicle's engine and air conditioning. However, in practical applications, in addition to the vehicle's engine and air conditioning requiring cooling from the silicone oil fan, other components of the vehicle also require cooling from the silicone oil fan. Therefore, it is impossible to accurately control the silicone oil fan based on the cooling needs of different components, which means it is impossible to reduce the temperature of other components and thus fail to meet the vehicle's cooling requirements. Summary of the Invention

[0004] This 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 cooling needs of multiple components in a vehicle when multiple components require cooling from the silicone oil fan, thereby achieving the vehicle's cooling requirements.

[0005] In a first aspect, a method for controlling a silicone oil fan, the silicone oil fan being configured in a hybrid vehicle, is provided, the method comprising: The engine parameters of the vehicle, the driving parameters of the vehicle, and the first required speed of the vehicle's control unit are obtained. The first required speed includes the speed of the silicone oil fan required by the control unit of the vehicle's power system. Based on the engine parameters, the driving parameters, and the first required speed of the control unit, the target required speed of the silicone oil fan is determined. The target required speed is the required speed that matches the current operating conditions of the vehicle. The engine parameters are used to describe the state of the engine during operation. Adjust the current speed of the silicone oil fan to the target required speed.

[0006] Through the above technical solution, this method can obtain engine parameters, vehicle driving parameters, and the first required speed of the vehicle's control unit. The first required speed includes the speed of the silicone oil fan required by the control unit in the vehicle's powertrain. Based on the engine parameters, driving parameters, and the first required speed of the control unit, the target required speed of the silicone oil fan is determined. The target required speed is the required speed that matches the current operating conditions 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, enabling the silicone oil fan to provide good heat dissipation for multiple components in the vehicle.

[0007] In conjunction with the first aspect, in some possible implementations, the engine parameters include engine coolant temperature, actual engine intake air temperature, and transmission oil temperature; the driving parameters include vehicle speed; and the target required speed of the silicone oil fan is determined based on the engine parameters, the driving parameters, and the first required speed of the control unit, including: Based on the engine coolant temperature and vehicle speed, the second required speed of the silicone oil fan is determined; Based on the engine's actual intake air temperature, the deviation between the engine's actual intake air temperature and the engine's target intake air temperature, and the vehicle speed, the third required speed of the silicone oil fan is determined. Based on the gearbox oil temperature, the fourth required speed of the silicone oil fan is determined; The highest of the first, second, third, and fourth required speeds is determined as the target required speed of the silicone oil fan.

[0008] Through the above technical solution, this method can determine the target required speed of the silicone oil fan among the required speeds of multiple components of the vehicle when multiple components have heat dissipation requirements, so as to meet all the heat dissipation requirements of the vehicle.

[0009] In conjunction with the first aspect, in some possible implementations, the third required speed of the silicone oil fan is determined based on the actual intake air temperature of the engine, the deviation between the actual intake air temperature and the target intake air temperature of the engine, and the vehicle speed, including: 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 and the target intake temperature of the engine. Based on the deviation between the engine's actual intake air temperature and its target intake air temperature, and the vehicle speed, a first correction coefficient is determined. The reference speed is multiplied by the first correction factor to obtain the third required speed of the silicone oil fan.

[0010] Through the above technical solution, this method can determine the reference speed of the silicone oil fan based on the actual intake air temperature of the engine and the deviation between the actual intake air temperature and the target intake air temperature of the engine; determine the first correction coefficient based on the deviation between the actual intake air temperature and the target intake air temperature of the engine and the vehicle speed; and multiply the reference speed by the first correction coefficient to obtain the third required speed of the silicone oil fan. This method 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 vehicle speed on the engine. Under these circumstances, the accuracy of the third required speed of the silicone oil fan is relatively high.

[0011] In conjunction with the first aspect, in some possible implementations, the current speed of the silicone oil fan should be adjusted to the target required speed, including: Obtain the actual engine speed and the current speed of the silicone oil fan; The base amount of silicone oil for the silicone oil fan is determined based on the actual speed of the engine and the target required speed. Based on the actual engine speed, the target required speed and the current speed of the silicone oil fan, a first control parameter for the target required speed is determined, and the first control parameter is used to correct the error of the target required speed. The base amount of silicone oil is corrected based on the first control parameter to obtain the target amount of silicone oil for the silicone oil fan. Based on the target amount of silicone oil in the silicone oil fan, the current speed of the silicone oil fan is adjusted to the target required speed.

[0012] Through the above technical solution, since the first control parameter is used to correct the error of the target required speed, the target amount of silicone oil for the silicone oil fan can be obtained by correcting the basic silicone oil amount based on the first control parameter; based on the target amount of silicone oil for 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.

[0013] In conjunction with the first aspect, in some possible implementations, the vehicle's driving parameters include accelerator pedal opening, vehicle speed, and gear position; the engine parameters include actual engine speed; the method also includes: When the vehicle's sound function is activated, the sound requirements parameters of the silicone oil fan are determined based on the accelerator pedal opening, vehicle speed, gear position, and actual engine speed. The vehicle's sound function is used to control the silicone oil fan to create sound effects. The maximum required speed among the first required speed, the second required speed, the third required speed, the fourth required speed, and the noise requirement parameter of the silicone oil fan is determined as the target required speed of the silicone oil fan.

[0014] Through the above technical solution, when the vehicle's sound function is activated, the vehicle is in parking or neutral, and the vehicle speed is less than or equal to a preset speed, the required speed for the silicone oil fan's sound is determined based on the accelerator pedal opening, the actual engine speed, and the correspondence with the sound requirement parameters. In other words, different actual engine speeds correspond to different required sound speeds, and these required speeds can meet the sound generation needs at different engine speeds.

[0015] In conjunction with the first aspect, in some possible implementations, the engine parameters include engine coolant temperature and actual engine intake air temperature. The determination of the target required speed of the silicone oil fan based on these engine parameters and the driving parameters includes at least one of the following: When the engine is actually idling, the required engine speed is determined based on the engine coolant temperature and the engine's actual intake air temperature; 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 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 the preset protection speed table between the actual engine speed and the silicone oil fan.

[0016] Through the above technical solution, 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 within the thermal protection zone, and the target required speed of the silicone oil fan is determined from multiple speeds outside the thermal protection zone.

[0017] In conjunction with the first aspect, in some possible implementations, the driving parameter includes the vehicle's altitude, the engine parameter includes the actual engine speed, and the method further includes: If the vehicle's altitude is higher than or equal to the first preset altitude and lower than or equal to the second preset altitude, a second correction coefficient corresponding to the vehicle's current altitude is determined based on the vehicle's current altitude. Based on the actual engine speed, the target required speed and the actual speed of the silicone oil fan, a second control parameter for the target required speed is determined. The second control parameter includes a proportional control parameter, an integral control parameter and a derivative control parameter. Based on the second correction coefficient and the second control parameter, the target required speed is corrected.

[0018] Through the above technical solution, since the second control parameter includes proportional control parameter, integral control parameter and derivative control parameter, the target required speed can be 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.

[0019] In conjunction with the first aspect, in some possible implementations, the method also includes: If 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, which is the maximum speed that matches the altitude of the vehicle. And / or, if the target required speed is less than the second target required speed, the current speed of the silicone oil fan is adjusted to the second target required speed, which is the minimum speed matched according to the current operating conditions of the vehicle.

[0020] By using the above technical solution, the target required speed is limited to between the first target required speed and the second target required speed, so as to achieve good heat dissipation requirements while avoiding excessive temperature of the silicone oil fan, which would cause the silicone oil in the silicone oil fan to deteriorate and reduce the probability of damage to the silicone oil fan.

[0021] Secondly, a control device for a silicone oil fan is provided, the device comprising: The acquisition module is used to acquire the vehicle's engine parameters, the vehicle's driving parameters, and the first required speed of the vehicle's control unit, wherein the first required speed is the speed of the silicone oil fan required by the control unit. The determination module is used to determine 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. The target required speed is the required speed that matches the current operating conditions of the vehicle. The engine parameters are used to describe the state of the engine during operation. The adjustment module is used to adjust the current speed of the silicone oil fan to the target required speed.

[0022] Thirdly, a vehicle is provided, including a memory and a processor. The memory is used to store executable program code, and the processor is used to call and run the executable program code from the memory, causing the vehicle to perform the methods described above for controlling the silicone oil fan.

[0023] Fourthly, a computer program product is provided, comprising: computer program code, which, when run on a computer, causes the computer to execute the method described above for controlling the silicone oil fan.

[0024] Fifthly, a computer-readable storage medium is provided that stores computer program code, which, when executed on a computer, causes the computer to perform the method described above for controlling the silicone oil fan. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the implementation environment of a control method for a silicone oil fan provided in an embodiment of this application; Figure 2 This is a schematic flowchart of a control method for a silicone oil fan provided in an embodiment of this application; Figure 3 This is a schematic flowchart of another control method for a silicone oil fan provided in an embodiment of this application; Figure 4 This is a schematic diagram of a thermal protection zone for a silicone oil fan provided in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of a control device for a silicone oil fan provided in an embodiment of this application; Figure 6 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this application. Detailed Implementation

[0026] The following will clearly and thoroughly describe the technical solutions in this application in conjunction with the accompanying drawings. In the description of the embodiments of this 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 this application, "multiple" means two or more than two.

[0027] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to imply or suggest relative importance or implicitly indicate the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0028] Currently in the automotive industry, multiple components in a vehicle generate heat during operation. To dissipate heat from these components, most vehicles are equipped with silicone oil fans. By regulating the flow of silicone oil within the fan and adjusting its speed, the silicone oil fan can lower the coolant temperature, thereby achieving the effect of cooling multiple components within the vehicle.

[0029] In related technologies, the main components of a silicone oil fan include an actuator, clutch, housing, fan blades, valves, silicone oil chamber, and drive shaft. The housing and fan blades are connected by bolts. The clutch and housing have a labyrinthine oil passage structure. The silicone oil fan assembly is directly connected to the front-end gear train of the engine via threads. The silicone oil chamber includes an oil reservoir, a working chamber, and valves to control the flow of silicone oil. The valves open the oil reservoir, allowing the silicone oil within to flow into the clutch oil passage under centrifugal force. When the valves close, residual silicone oil in the oil passage is scraped back into the oil reservoir by an oil brush under centrifugal force. The actuator coil in the silicone oil fan controls the opening and closing of the valves via engagement / disengagement to regulate the silicone oil flowing into the clutch.

[0030] Figure 1 This is a schematic diagram of the implementation environment of a silicone oil fan control method provided in an embodiment of this application.

[0031] For example, such as Figure 1 As shown, the implementation environment includes a silicone oil fan 110, an electronic control unit (ECU) 120, and an engine 130.

[0032] 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 the silicone oil; it is also called a silicone oil clutch. The silicone oil fan is internally sealed with viscous silicone oil, and torque is transmitted through the shear viscosity of the 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 via a fan control wiring harness.

[0033] ECU120 is an important control unit of the vehicle. It can acquire relevant data of the vehicle and control the vehicle to perform corresponding operations based on the relevant data. For example, it can acquire the required speed of the silicone oil fan 110 and determine whether to control the silicone oil fan 110 to adjust its speed based on the required speed.

[0034] Engine 130 is used to provide power to the vehicle. Engine 130 is capable of sending data to ECU 120. For example, engine 130 can send the rotational speed of the silicone oil fan required by engine 130 to ECU 120.

[0035] Figure 2 This is a flowchart illustrating a control method for a silicone oil fan provided in an embodiment of this application.

[0036] For example, such as Figure 2 As shown, taking the electronic control unit as the executing entity as an example, the method 200 includes steps 201-203.

[0037] Step 201: Obtain the vehicle's engine parameters, vehicle driving parameters, and the first required speed of the vehicle's control unit. The first required speed includes the speed of the silicone oil fan required by the control unit in the vehicle's power system.

[0038] The vehicle's engine parameters are used to determine the engine's operating status. These parameters include engine coolant temperature, actual intake air temperature, and transmission fluid temperature. The vehicle's driving parameters include its speed.

[0039] Engine coolant temperature is the temperature of the engine coolant, and its operating status can be monitored. Engine intake air temperature is the temperature of the air entering the engine combustion chamber; it is used to monitor engine combustion efficiency. Transmission fluid temperature is the temperature of the lubricating oil inside the transmission. Its operating status can be monitored.

[0040] In the case of a hybrid vehicle, the vehicle's control unit includes a hybrid control unit (HCU). A hybrid vehicle is an automobile equipped with both a traditional internal combustion engine (such as a gasoline or diesel engine) and an electric motor. The HCU monitors the operating status of various components in the vehicle. For example, the HCU can monitor the temperature of the power battery, the electric motor, the battery itself, and the operating status of the vehicle's air conditioning system.

[0041] A silicone oil fan is a cooling component that controls fan speed by adjusting the amount of silicone oil supplied. The viscosity of silicone oil changes with temperature, allowing the silicone oil fan to automatically adjust its speed based on the amount of silicone oil present.

[0042] It should be understood that when the ECU detects engine parameters, it controls the silicone oil fan to move its piston according to the engine's cooling needs, adjusting the amount of oil supplied to the fan. The silicone oil fan then delivers coolant from the engine to the radiator. The coolant transfers heat from the engine to the radiator, thereby lowering the engine coolant temperature, allowing the silicone oil fan to effectively cool the engine.

[0043] Once the silicone oil fan detects the vehicle's control unit's initial required speed, the ECU controls the silicone oil fan to move its piston according to that speed, thus adjusting the amount of silicone oil supplied. The silicone oil fan blows air across the radiator, carrying away heat and lowering the temperature of the battery coolant or electric motor coolant. The coolant circulates between the battery and radiator, or between the electric motor and radiator, further reducing the temperature of the battery coolant or electric motor coolant, allowing the silicone oil fan to dissipate heat from the vehicle's components according to the initial required speed.

[0044] It should be understood that the silicone oil fan assembly is directly connected to the engine's front-end gear train via a threaded connection; therefore, the engine speed affects the silicone oil fan's speed. When the ECU detects an increase in engine temperature, it moves the piston according to the engine's cooling requirements, increasing the silicone oil level. The silicone oil level can then be used to control the silicone oil fan's speed. In this case, obtaining engine parameters, vehicle driving parameters, and the initial required speed facilitates the control of the silicone oil fan's speed.

[0045] Vehicle driving parameters are used to determine the vehicle's driving status. For example, driving parameters include vehicle speed. At different vehicle speeds, the vehicle's engine parameters will differ. Since the engine is connected to the silicone oil fan, obtaining the engine parameters, vehicle driving parameters, and the control unit's initial required speed facilitates the control of the silicone oil fan.

[0046] Step 202: Based on 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 operating conditions of the vehicle. The engine parameters are used to describe the state of the engine during operation.

[0047] The vehicle's current operating condition refers to its operating status at the current moment. For example, the vehicle's current operating condition includes its current driving state, altitude, and other conditions. Furthermore, different operating conditions at the current moment correspond to different required engine speeds.

[0048] The target required speed is the maximum required speed of the vehicle under the current operating conditions. During vehicle operation, multiple components require heat dissipation, resulting in multiple required speeds for these components. The target required speed is the highest among these multiple required speeds.

[0049] For example, multiple components of a vehicle, such as the power battery, engine, and air conditioning, require heat dissipation. Therefore, the highest required speed among the multiple required speeds for these components is determined as the target required speed.

[0050] Step 203: Adjust the current speed of the silicone oil fan to the target required speed.

[0051] It should be understood that during vehicle operation, multiple components require the silicone oil fan for cooling. Since the target required speed is the speed that matches the vehicle's current operating conditions, which is the highest required speed among multiple required speeds, adjusting the current speed of the silicone oil fan to the target required speed allows the silicone oil fan to meet the highest cooling demand among the multiple components in the vehicle, thereby achieving a good cooling effect.

[0052] Since the speed of the silicone oil fan is adjusted based on the amount of silicone oil, the amount of silicone oil in the silicone oil fan is controlled from the oil reservoir 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.

[0053] This application provides a control method for a silicone oil fan. This method acquires engine parameters, vehicle driving parameters, and a first required speed of the vehicle's control unit. The first required speed includes the speed of the silicone oil fan required by the control unit in the vehicle's powertrain. Based on the engine parameters, driving parameters, and the first required speed of the control unit, a target required speed of the silicone oil fan is determined. The target required speed is the speed matched to the vehicle's current operating conditions. The engine parameters 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 cooling capacity of the silicone oil fan, enabling it to provide good cooling for multiple components in the vehicle.

[0054] Figure 3 This is a schematic flowchart of another control method for a silicone oil fan provided in the embodiments of this application.

[0055] It should be noted that steps 201-203 above are a simplified description of a silicone oil fan control method provided in the embodiments of this application. The following will provide a more detailed description of the silicone oil fan control method provided in the embodiments of this application, using some examples. See [link to relevant documentation]. Figure 3 Taking the electronic control unit as the executing entity as an example, the method includes the following steps 301-304.

[0056] Step 301: Obtain the vehicle's engine parameters, vehicle driving parameters, and the first required speed of the vehicle's control unit. The first required speed includes the speed of the silicone oil fan required by the control unit in the vehicle's power system.

[0057] It should be understood that during vehicle operation, multiple components generate heat, which requires cooling by silicone oil fans. For example, in the case of a hybrid vehicle, the components include the battery and the electric motor. During operation, the vehicle's engine, power battery, storage battery, electric motor, and air conditioning system all require cooling.

[0058] The vehicle is a hybrid vehicle, and its control unit includes an HCU (Heat Control Unit), which coordinates the operation of the engine and electric motor. The HCU receives the cooling requirements of each component, calculates the initial required speed of the silicone oil fan based on these requirements, and sends this initial required speed to the ECU (Electronic Control Unit) to cool the components accordingly.

[0059] For example, if the electric motor in a vehicle's powertrain requires cooling, the HCU calculates the initial required speed of the silicone oil fan based on the motor's cooling needs. Based on this initial required speed, the ECU controls the piston movement, increasing the oil level in the silicone oil clutch. The silicone oil fan then blows air across the radiator, which carries away the heat from the motor's coolant, thus cooling the motor.

[0060] The following explains how to obtain the vehicle's engine parameters, driving parameters, and the first required speed of the vehicle's control unit.

[0061] In one possible implementation, engine parameters are acquired based on engine sensors.

[0062] The engine parameters include engine coolant temperature, actual engine intake air temperature, and transmission oil temperature.

[0063] Engine coolant temperature is the core component of the engine cooling system. The coolant circulates inside the engine, absorbing energy and releasing it into the air through the radiator.

[0064] The actual intake air temperature of an engine refers to the temperature of the air before it enters the engine's combustion chamber. Excessively high intake air temperatures result in too little oxygen entering the combustion chamber, leading to decreased engine efficiency and potentially even knocking.

[0065] For transmissions, excessively high transmission oil temperature can cause the oil to deteriorate, reduce lubrication, increase wear, and even lead to transmission failure.

[0066] In some embodiments, an engine sensor for detecting engine coolant temperature is installed in the coolant lines of the engine cooling system. The engine sensor is a thermistor with a negative temperature coefficient. As the engine coolant temperature rises, the resistance of the thermistor decreases, thereby enabling the determination of the engine coolant temperature.

[0067] In some embodiments, an engine sensor for detecting the actual intake air temperature is installed between the air filter and the throttle valve in the intake system. The engine sensor is a temperature monitoring sensor. For example, the engine sensor is a thermistor with a negative temperature coefficient. As the engine intake air temperature increases, the resistance of this thermistor decreases, thereby enabling the acquisition of the actual engine intake air temperature.

[0068] In this implementation, engine parameters are obtained based on engine sensors, enabling real-time monitoring of the engine's operating status to determine whether to cool the engine.

[0069] It should be understood that the higher the vehicle speed, the faster the engine speed, and the greater the cooling demand. At lower speeds and in congested or uphill conditions, the engine load is greater, resulting in higher engine speeds and even greater cooling demands. Therefore, the silicone oil fan needs to operate at a higher speed. In such situations, it is necessary to obtain the vehicle speed to determine whether the silicone oil fan is needed to cool multiple vehicle components.

[0070] In one possible implementation, the vehicle speed is obtained based on driving parameters obtained from a vehicle speed sensor or a navigation system.

[0071] In some embodiments, the vehicle speed is determined based on pulse signals generated by multiple wheel speed sensors and the tire radius.

[0072] In this implementation, the accuracy of obtaining vehicle speed based on vehicle speed sensors or navigation systems is relatively high.

[0073] In one possible implementation, the first required speed of the HCU is obtained based on the Controller Area Network (CAN) bus.

[0074] The CAN bus is a high-speed, real-time, and reliable serial communication protocol used for communication between the ECU and HCU. The primary required speed also includes the speed of the silicone oil fan required by the control unit in the vehicle's powertrain system and the required speed of the silicone oil fan for the vehicle's air conditioning system.

[0075] For example, if the vehicle's powertrain electric motor requires cooling, the HCU calculates the initial required speed of the silicone oil fan based on the motor's cooling needs. Similarly, if the vehicle's air conditioning system requires cooling, the HCU calculates the initial required speed of the silicone oil fan based on the air conditioning system's cooling needs.

[0076] In some embodiments, the temperature of each component in the vehicle is detected by a temperature sensor, the heat dissipation requirement of each component is determined based on the temperature of each component, 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.

[0077] Duty cycle, also known as signal duty cycle, is the ratio of the high-level (or on) time of a signal to the total time of the pulse cycle, usually expressed as a percentage. The mathematical expression for duty cycle is: Duty cycle = (High level time / Cycle time) × 100% In some embodiments, the duty cycle corresponds to the speed of the silicone oil fan as 0-100% corresponds to 0-5000 rpm.

[0078] In some embodiments, the HCU sends an acknowledgment signal to the ECU to confirm that the ECU can communicate with the HCU. If the ECU does not receive an acknowledgment signal within a first preset time period, it determines that the first required speed is a preset speed.

[0079] The first preset duration is automatically determined by the vehicle controller or set by technicians according to actual conditions; this application embodiment does not limit this. For example, the first preset duration is 10 seconds.

[0080] The preset speed is either automatically determined by the vehicle controller or set by technicians based on actual conditions; this application embodiment does not limit this. For example, the preset speed is 2500 rpm.

[0081] For example, if the ECU does not receive a confirmation signal within 10 seconds, the first required speed is determined to be 2500 rpm.

[0082] It should be understood that if the ECU does not receive a confirmation signal within the first preset time period, the first required speed will be adjusted to the preset speed to avoid the HCU's heat dissipation requirements being unmet, thereby preventing damage to vehicle components.

[0083] In some embodiments, air conditioning parameters are obtained based on pressure sensors.

[0084] Among the air conditioning parameters is the air conditioning pressure. A pressure sensor is used to monitor the pressure of the vehicle's air conditioning system. If the silicone oil fan cannot dissipate heat from the air conditioning unit, the high-pressure side pressure will increase. Therefore, the cooling performance of the vehicle's air conditioning system can be monitored based on the air conditioning pressure.

[0085] In some embodiments, the pressure sensor is connected to the high-pressure side and low-pressure side interfaces of the vehicle air conditioner, respectively, to record the pressure value of the vehicle air conditioner.

[0086] In this implementation, the first required speed of the HCU is obtained based on the CAN bus, so as to control the silicone oil fan based on the first required speed.

[0087] Step 302: Based on 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 operating conditions of the vehicle.

[0088] During vehicle operation, multiple components require heat dissipation, thus each component requires a different speed from its silicone oil fan. Therefore, to simultaneously meet the heat dissipation needs of multiple vehicle components, the target required speed of the silicone oil fan needs to be determined based on engine parameters, driving parameters, and the control unit's initial required speed.

[0089] The target required speed is the speed required to match the vehicle's current operating conditions. Engine parameters are used to describe the state of the engine during operation.

[0090] It should be understood that at the same engine speed, the speed of the silicone oil fan will vary depending on the atmospheric pressure at different altitudes. In other words, the target required engine speed is affected by the vehicle's current operating conditions.

[0091] The following explains how to determine the target required speed of the silicone oil fan based on engine parameters, driving parameters, and the first required speed of the control unit.

[0092] In one possible implementation, a second required speed of the silicone oil fan is determined based on engine coolant temperature and vehicle speed; a third required speed of the silicone oil fan is determined based on the actual engine intake air temperature, the deviation between the actual engine intake air temperature and the engine's target intake air temperature, and vehicle speed; a fourth required speed of the silicone oil fan is determined based on transmission oil temperature; and the largest required speed among the first, second, third, and fourth required speeds is determined as the target required speed of the silicone oil fan.

[0093] The target intake air temperature is the intake air temperature required for the engine to operate under ideal conditions.

[0094] The deviation between the engine's actual intake air temperature and the engine's target intake air temperature is used to monitor and adjust the engine's actual intake air temperature.

[0095] In this implementation, a second required speed for the silicone oil fan is determined based on engine coolant temperature and vehicle speed. A third required speed is determined based on the actual engine intake air temperature, the deviation between the actual engine intake air temperature and the engine's target intake air temperature, and vehicle speed. A fourth required speed is determined based on transmission oil temperature. The highest required speed among the first, second, third, and fourth required speeds is determined as the target required speed for the silicone oil fan. In other words, when multiple components of the vehicle have cooling requirements, the highest required speed among the required speeds of the silicone oil fan for these components is determined as the target required speed for the silicone oil fan to meet all the vehicle's cooling needs.

[0096] To provide a more detailed explanation of the above embodiments, the following description is divided into several parts.

[0097] The first part explains how to determine the second required speed of the silicone oil fan based on engine coolant temperature and vehicle speed.

[0098] In some possible implementations, the second required speed of the silicone oil fan is determined based on a table showing the correspondence between engine coolant temperature, vehicle speed, and silicone oil fan speed.

[0099] Table 1 is a schematic table of different engine coolant temperatures, vehicle speeds, and corresponding second required speeds of silicone oil fans in the embodiments of this application.

[0100] Table 1

[0101] For example, as shown in Table 1, the y-axis represents vehicle speed, and the x-axis represents engine coolant temperature. Based on vehicle speed and engine coolant temperature, the required speed of the silicone oil fan can be determined, which is the second required speed of the silicone oil fan represented by the x-axis. Since different vehicle speeds affect engine speed—the faster the vehicle speed, the faster the engine speed, and therefore the higher the engine coolant temperature—it is necessary to determine the corresponding speed of the silicone oil fan to lower the engine coolant temperature. Table 1 shows that when the engine coolant temperature is 93℃, regardless of the vehicle speed, the engine coolant temperature is relatively low. In this case, the silicone oil fan does not need to cool the engine, so the second required speed of the silicone oil fan is 0. When the engine coolant temperature is between 96℃ and 99℃, the vehicle speed has little impact on the engine coolant temperature, and the engine coolant temperature is low. In this case, a second required speed of 500-700 RPM for the silicone oil fan is sufficient to meet the engine's cooling needs. When the engine coolant temperature is between 102℃ and 106℃, it is relatively high. At this temperature, vehicle speed has a significant impact on the engine coolant temperature; therefore, the secondary required speed of the silicone oil fan increases with increasing vehicle speed. When the engine coolant temperature is between 108℃ and 112℃, it is also relatively high, and the secondary required speed of the silicone oil fan is also relatively high. As shown in Table 1, when the engine coolant temperature exceeds 112℃, to avoid engine damage due to high engine coolant temperature, the silicone oil fan needs to be controlled at its highest secondary required speed of 4150 rpm.

[0102] Since the engine coolant temperature is obtained from a temperature sensor, if the temperature sensor malfunctions, the engine coolant temperature cannot be accurately determined. Consequently, the determined secondary required speed of the silicone oil fan will be inaccurate and unable to meet the engine's cooling needs. In this situation, to prevent engine damage due to overheating, the silicone oil fan is controlled to operate at its highest secondary required speed of 4150 rpm.

[0103] In this implementation, the second required speed of the silicone oil fan is determined based on the correspondence table between engine coolant temperature, vehicle speed, and silicone oil fan, which is highly accurate and can meet the engine's heat dissipation requirements.

[0104] The second part determines the third required speed of the silicone oil fan based on the engine's actual intake air temperature, the deviation between the engine's actual intake air temperature and the engine's target intake air temperature, and the vehicle speed.

[0105] In one possible implementation, a reference speed of the silicone oil fan is determined based on the actual intake air temperature of the engine and the deviation between the actual intake air temperature and the target intake air temperature of the engine; a first correction coefficient is determined based on the deviation between the actual intake air temperature and the target intake air temperature of the engine and the vehicle speed; and the reference speed is multiplied by the first correction coefficient to obtain the third required speed of the silicone oil fan.

[0106] In some embodiments, the formula for calculating the target intake air temperature is as follows: Target intake temperature = (basic target intake temperature + target intake temperature correction deviation value) * target correction coefficient.

[0107] The target intake air temperature correction deviation value includes the environmental correction deviation value and the air conditioning correction deviation value.

[0108] Since the target intake air temperature of an engine is the intake air temperature required for the engine to operate under ideal conditions, and the target intake air temperature affects the engine's fuel efficiency, in order to obtain an accurate target intake air temperature, it is necessary to obtain the engine at different speeds and different engine loads, and determine the basic target intake air temperature based on the engine speed and engine load.

[0109] Because the oxygen content in the air varies with different ambient temperatures, it is necessary to determine the environmental correction deviation value for the target intake air temperature for different ambient temperatures. In fuel-powered vehicles, the air conditioning condenser is usually installed in front of the low-temperature radiator. The low-temperature radiator affects the coolant temperature, which in turn affects the target intake air temperature. In this case, it is necessary to determine the air conditioning correction deviation value for the target intake air temperature for different air conditioning pressures.

[0110] Different driving modes result in different engine speeds and vehicle speeds, leading to different requirements for target intake air temperature and thus different target correction factors. For example, in standard mode, the required engine speed remains constant, so the target correction factor is 1. However, in economy mode, at a speed of 30 km / h, the engine needs to fully combust the fuel, requiring sufficient air; in this case, the target correction factor is determined to be 1.01.

[0111] It should be understood that adjusting the target intake air temperature can make the target intake air temperature more closely match the actual conditions of the vehicle, thereby improving the engine's operating efficiency.

[0112] It should be understood that the target intake air temperature and the actual intake air temperature of the engine affect the engine's working efficiency. If the target intake air temperature or the actual intake air temperature of the engine is too high, the excessively high intake air temperature will result in too little oxygen entering the engine combustion chamber, which will lead to a decrease in engine working efficiency. Therefore, it is necessary to use a silicone oil fan to reduce the actual intake air temperature of the engine.

[0113] Table 2 below is a schematic table of the actual intake air temperature, vehicle speed and corresponding reference speed of silicone oil fan for different engines in the embodiments of this application.

[0114] Table 2

[0115] As shown in Table 2, 'a' represents the actual engine intake air temperature, and 'b' represents the deviation between the actual and target engine intake air temperatures. The reference speed of the silicone oil fan is determined based on the actual engine intake air temperature and the deviation. It can be understood that, as shown in Table 2, when the actual engine intake air temperature is less than or equal to 40°C, the actual intake air temperature is low, and the oxygen content in the air is sufficient; therefore, a silicone oil fan is not needed to cool the engine. When the deviation between the actual and target engine intake air temperatures is 0, it means that the oxygen content in the air meets the requirements of the engine's combustion chamber. Therefore, even if the actual engine intake air temperature is higher, a silicone oil fan is not needed to cool the engine, and in this case, the reference speed of the silicone oil fan is 0. When the actual engine intake air temperature is greater than 40°C, the actual engine intake air temperature is high. A higher deviation between the actual and target intake air temperatures indicates a lower oxygen content in the engine intake air, thus requiring a higher speed for the silicone oil fan. As shown in Table 2, the higher the deviation between the actual intake air temperature and the target intake air temperature, the higher the reference speed of the silicone oil fan.

[0116] It should be understood that if the actual intake air temperature of the engine is higher than the target intake air temperature, then the actual increase in intake air temperature required is a negative value. Conversely, if the actual intake air temperature of the engine is lower than the target intake air temperature, then the actual increase in intake air temperature required is a positive value.

[0117] In some embodiments, the actual increase in intake temperature required for the engine's combustion chamber is determined based on the deviation between the engine's actual intake temperature and the engine's target intake temperature.

[0118] In some embodiments, the first correction factor is between 0 and 4. The higher the vehicle speed and the greater the actual increase in intake air temperature required, the larger the first correction factor becomes.

[0119] It should be understood that different vehicle speeds require different engine speeds, and therefore the target intake air temperature varies at different vehicle speeds. In this case, the reference speed of the silicone oil fan is adjusted based on the vehicle speed.

[0120] That is, the reference speed is multiplied by the first correction factor to obtain the third required speed of the silicone oil fan.

[0121] In this implementation, the reference speed of the silicone oil fan is determined based on the actual intake air temperature of the engine and the deviation between the actual intake air temperature and the target intake air temperature of the engine; a first correction coefficient is determined based on the deviation between the actual intake air temperature and the target intake air temperature of the engine and the vehicle speed; the reference speed is multiplied by the first correction coefficient to obtain the third required speed of the silicone oil fan. This method 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 vehicle speed on the engine. In this case, the accuracy of the third required speed of the silicone oil fan is relatively high.

[0122] Part Three explains the relevant content regarding determining the fourth required speed of the silicone oil fan based on the transmission oil temperature.

[0123] In one possible implementation, the Telematics Control Unit (TCU) in the vehicle sends the cooling requirements of the transmission to the ECU. If the ECU does not receive a confirmation signal within a second preset time period, the TCU determines the fourth required speed to be the preset speed.

[0124] The second preset duration is automatically determined by the vehicle controller or set by technicians according to actual conditions; this embodiment does not limit this. For example, the second preset duration is 10 seconds.

[0125] The preset speed is either automatically determined by the vehicle controller or set by technicians based on actual conditions; this application embodiment does not limit this. For example, the preset speed is 2500 rpm.

[0126] For example, if the ECU does not receive a confirmation signal within 10 seconds, it determines that the fourth required speed is 2500 rpm.

[0127] It should be understood that if the ECU does not receive a confirmation signal within the second preset time period, it will adjust the fourth required speed to the preset speed to meet the heat dissipation requirements of the transmission, thereby preventing the transmission from being damaged due to overheating.

[0128] It should be understood that excessively high transmission fluid temperature can lead to fluid deterioration, reduced lubrication, increased wear, and even transmission failure. Therefore, the ECM can adjust the speed of the silicone oil fan to ensure that the transmission fluid temperature remains within a relatively safe range, extending the transmission's lifespan and improving shift smoothness.

[0129] In one possible implementation, the fourth required speed of the silicone oil fan is determined based on a table showing the relationship between transmission oil temperature and silicone oil fan speed.

[0130] Table 3 is a schematic table of the fourth required speed of the silicone oil fan corresponding to different transmission oil temperatures in the embodiments of this application.

[0131] Table 3

[0132] As shown in Table 3, a transmission oil temperature below 80℃ indicates a low transmission oil temperature, meaning the transmission does not require a silicone oil fan for cooling. A transmission oil temperature greater than or equal to 80℃ but less than 90℃ indicates a relatively high transmission oil temperature; in this case, the cooling demand is lower, and the required speed for the silicone oil fan is 800 rpm. The higher the transmission oil temperature, the greater the cooling demand, and therefore the higher the required speed for the silicone oil fan. If the cooling demand is greater in the signal sent from the TCU to the ECU, the higher the required speed for the silicone oil fan.

[0133] In this implementation, based on the relationship table between transmission oil temperature and silicone oil fan, the fourth required speed of silicone oil fan is determined, and the fourth required speed of silicone oil fan that meets the cooling requirements of transmission can be obtained.

[0134] Part Four: The maximum required speed among the first, second, third, and fourth required speeds is determined as the target required speed for the silicone oil fan.

[0135] It should be understood that if multiple components in a vehicle need to be cooled, then multiple components correspond to multiple required speeds. In order for the silicone oil fan to meet the cooling needs of all components, the maximum value among the multiple required speeds is taken to determine the target required speed of the silicone oil fan.

[0136] For example, if 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, then the first required speed is the largest. Therefore, the first required speed of 4120 rpm is determined as the target required speed of the silicone oil fan.

[0137] Optionally, in practical applications, silicone oil fans generate noise during operation, which can be attractive to users. Therefore, some vehicles' silicone oil fans also have a required speed corresponding to the noise function.

[0138] The following explains how the target required speed of the silicone oil fan is determined based on the accelerator pedal opening and the actual engine speed when the vehicle's sound function is activated.

[0139] In one possible implementation, when the vehicle's sound function is activated, the sound demand parameters of the silicone oil fan are determined based on the accelerator pedal opening, vehicle speed, gear position, and actual engine speed. The vehicle's sound function is used to control the silicone oil fan to create a sound effect. The maximum demand speed among the first demand speed, second demand speed, third demand speed, fourth demand speed, and the silicone oil fan's sound demand parameters is determined as the target demand speed of the silicone oil fan.

[0140] The vehicle's sound function controls the silicone oil fan to create sound effects. The accelerator pedal opening is the pedal opening parameter in the driving parameters. Accelerator pedal opening monitors the accelerator pedal position, and the vehicle's gear position monitors the transmission.

[0141] The noise requirement parameters include the required engine speed.

[0142] It should be understood that, given that multiple components of the vehicle require heat dissipation and the silicone oil fan also needs to generate a sound effect, in order to meet the vehicle's heat dissipation and sound requirements, the highest required speed among the multiple required speeds and the silicone oil fan's sound effect requirements is determined as the target required speed of the silicone oil fan.

[0143] In this implementation, when the vehicle's sound function is activated, the sound requirement parameters for the silicone oil fan are determined based on the accelerator pedal opening, vehicle speed, gear position, and actual engine speed. The vehicle's sound function controls the silicone oil fan to create a sound effect. The maximum required speed among the first, second, third, and fourth required speeds, and the silicone oil fan's sound requirement parameters, is determined as the target required speed for the silicone oil fan. In other words, when multiple vehicle components require heat dissipation and the silicone oil fan also needs to create a sound effect, the maximum required speed among the multiple required speeds and the silicone oil fan's sound requirement parameters is determined as the target required speed for the silicone oil fan to meet both the vehicle's heat dissipation and sound requirements.

[0144] To provide a more detailed explanation of the above embodiments, the following description is divided into several parts.

[0145] The first part explains how to determine the required parameters for the sound 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.

[0146] In one possible implementation, when the vehicle's sound function is activated, the vehicle is in parking or neutral gear, and the vehicle speed is less than or equal to a preset speed, the required speed for the silicone oil fan is determined based on the accelerator pedal opening, the actual engine speed, and the correspondence with the sound demand parameters.

[0147] It should be understood that, in the embodiments of this application, the preset vehicle speed can be set to zero.

[0148] Table 4 is a schematic table illustrating the required speed of the silicone oil fan for different accelerator pedal openings, actual engine speeds, and corresponding noise levels in the embodiments of this application.

[0149]

[0150] It should be noted that in Table 4 above, p represents the required engine speed for the sound effect, and q represents the accelerator pedal opening. The content shown in Table 4 is for illustrative purposes only. In actual applications, the values ​​of X, Y, Z1, Z2, Z3, Z4, Z5, Z6, Z7, Z8, Z9, and Z10 can be set according to the actual situation. Furthermore, the required engine speeds for the sound effect shown in Table 4 are the speeds necessary for the silicone oil fan to create the desired sound effect.

[0151] In this scenario, with the vehicle's sound function activated, the vehicle in park or neutral, and the vehicle speed less than or equal to a preset speed, the required speed for the silicone oil fan's sound is determined based on the accelerator pedal opening, the actual engine speed, and the correspondence with the sound requirement parameters. In other words, different actual engine speeds correspond to different required sound speeds, and these required speeds can meet the sound generation needs at different engine speeds.

[0152] The second part explains how to determine the target speed of the silicone oil fan as the highest speed among the first, second, third, and fourth required speeds, as well as the noise level requirement parameters of the silicone oil fan.

[0153] It should be understood that if multiple components in a vehicle need to be cooled and the user also needs the silicone oil fan to create a sound effect, then multiple components correspond to multiple required speeds. In order for the silicone oil fan to meet the cooling needs and sound function of all components, the maximum value among the multiple required speeds is taken to determine the target required speed of the silicone oil fan.

[0154] For example, if the first required speed is 4120 rpm, the second required speed is 2000 rpm, the third required speed is 1500 rpm, the fourth required speed is 2500 rpm, and the noise requirement parameter is 2400 rpm, then the first required speed is the largest, and so the first required speed is determined as the target required speed of the silicone oil fan.

[0155] It should be understood that the end of the silicone oil fan is directly connected to the front pulley system of the engine via a thread, and the speed of the silicone oil fan is affected by the engine speed. When the vehicle is idling, the engine is still running and needs to dissipate heat; however, the speed of the silicone oil fan decreases as the engine speed decreases, thus causing the silicone oil fan to be unable to meet the engine's cooling needs. In this situation, to avoid the above problem, the target required speed of the silicone oil fan needs to be re-determined based on the engine's required speed.

[0156] The following explains how to determine the target required speed of the silicone oil fan when the engine is actually idling.

[0157] In one possible implementation, when the engine's actual speed is idling, the required engine speed is determined based on the engine coolant temperature and the engine's actual intake air temperature; the target required speed of the silicone oil fan is determined based on the engine's required speed and the preset speed ratio between the engine and the silicone oil fan.

[0158] The silicone oil fan is a cooling component that controls the fan speed by adjusting the amount of silicone oil supplied. The viscosity of silicone oil changes with temperature, allowing the silicone oil fan to automatically adjust its speed based on the engine temperature.

[0159] The engine's actual speed is idling, which means that the engine is working at a low speed. Since the end of the silicone oil fan is directly connected to the front wheel system of the engine through a thread, when the engine is working at a low speed, the speed of the silicone oil fan is also low. Therefore, the speed of the silicone oil fan is completely unable to meet the vehicle's heat dissipation needs.

[0160] Once engine parameters are detected, the vehicle controller controls the silicone oil fan to move its piston according to the engine's cooling needs, adjusting the oil supply to the fan. The silicone oil fan then blows air across the radiator, carrying away heat and lowering the engine coolant temperature. The coolant circulates between the engine and radiator, transferring heat from the engine to the radiator so the silicone oil fan can effectively cool the engine.

[0161] 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 coolant temperature and the engine's actual intake air temperature; the target required speed of the silicone oil fan is determined based on the engine's required speed and the preset speed ratio between the engine and the silicone oil fan.

[0162] In this implementation, when the engine's actual speed is idling, the required engine speed is determined based on the engine coolant temperature and the engine's actual intake air temperature; based on the required engine speed and the preset speed ratio between the engine and the silicone oil fan, the target required speed of the silicone oil fan is determined. This ensures that the silicone oil fan meets the engine's cooling needs when the engine's actual speed is idling.

[0163] To provide a more detailed explanation of the above embodiments, the following description is divided into several parts.

[0164] The first part explains how to determine the required engine speed based on engine coolant temperature and actual intake air temperature when the engine is idling.

[0165] In one possible implementation, when the actual engine speed is idling, the required engine speed is determined based on the relationship between engine coolant temperature and the required engine speed.

[0166] It should be understood that the engine continuously generates heat when the vehicle is idling. If the engine coolant temperature remains above or equal to the first preset temperature and below or equal to the third preset temperature for an extended period, it indicates that the engine requires cooling by the silicone oil fan to avoid affecting engine performance. Therefore, the engine speed needs to be increased to the target speed to increase the speed of the silicone oil fan.

[0167] Table 5 is an illustrative table showing the relationship between different engine coolant temperatures and required engine speeds in the embodiments of this application.

[0168]

[0169] For example, as shown in Table 5 above, when the engine coolant temperature is 108°C and the duration of the engine coolant temperature is 2 seconds, the required engine speed is obtained from the table above as 1100 rpm, thereby increasing the required engine speed to 1100 rpm.

[0170] In this implementation, when the engine's actual speed is idling, the engine's required speed is determined based on the relationship between the engine coolant temperature and the engine's required speed. This allows the target required speed of the silicone oil fan to meet the engine's cooling needs, thereby increasing the speed of the silicone oil fan and reducing the engine coolant temperature.

[0171] It should be understood that when the engine's actual speed is idling, the engine's actual intake air temperature has a significant impact on the engine's working efficiency. Therefore, the engine's cooling demand is greater when the engine's actual intake air temperature corresponds to the engine's actual intake air temperature. Thus, the engine's required speed is determined based on the relationship between the engine's actual intake air temperature and the engine's required speed.

[0172] In one possible implementation, when the engine's actual speed is idling, the required engine speed is determined based on the correspondence between the engine's actual intake air temperature and the engine's required speed.

[0173] Table 6 is an illustrative table showing the actual intake air temperature of different engines and the required engine speed in the embodiments of this application.

[0174]

[0175] For example, as shown in Table 6 above, when the engine intake air temperature is 65°C and the duration of the engine intake air temperature is 60 seconds, the required engine speed is obtained from the table above as 1000 r / min, thereby increasing the required engine speed to 1000 r / min.

[0176] With the engine's actual speed at idle, the engine's required speed is determined based on the relationship between the engine's actual intake air temperature and the engine's required speed, so as to obtain the target required speed of the silicone oil fan that can meet the engine's cooling needs.

[0177] The second part explains how to determine the target required speed of the silicone oil fan based on the engine's required speed and the preset speed ratio between the engine and the silicone oil fan.

[0178] The preset speed ratio refers to the proportional relationship between the speed of the silicone oil fan and the engine speed. The formula for calculating the speed of the silicone oil fan is as follows.

[0179] Silicone oil fan speed = engine required speed * preset speed ratio In some embodiments, the preset speed ratio between the silicone oil fan and the engine is affected by the meshing rate of the silicone oil fan. The meshing rate 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 decrease accordingly for the same engine speed requirement.

[0180] It should be understood that the engagement ratio of the silicone oil fan can be adjusted by adjusting the design parameters of the silicone oil fan. This application embodiment uses the silicone oil fan in full engagement as an example to determine the transmission ratio between the silicone oil fan and the engine.

[0181] For example, if the preset speed ratio between the silicone oil fan and the engine is 1.2, and the engine's required speed is 1000 r / min, then the speed of the silicone oil fan will be 1200 r / min.

[0182] It should be understood that when a vehicle is idling, the engine continuously generates heat, thus requiring significant cooling. However, because the engine is connected to the silicone oil fan, there is a preset speed ratio between the fan's speed and the engine's speed. Even when the silicone oil fan is fully engaged, its maximum speed is determined based on the engine's speed and this preset speed ratio. Full engagement means that all the silicone oil in the fan's reservoir has entered the working chamber. The reservoir stores the silicone oil, and the working chamber engages the silicone oil clutch to increase the fan's speed. The silicone oil fan reaches its maximum speed when fully engaged.

[0183] In this implementation, 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 cooling requirements of the engine.

[0184] It should be understood that during the operation of a silicone oil fan, silicone oil flows in the gap between the drive disc and the housing. Due to the viscosity of silicone oil, frictional heat is generated during its flow. The higher the fan speed, the more heat is generated by the silicone oil. If the silicone oil temperature becomes too high, it will deteriorate, thus affecting the performance and lifespan of the silicone oil fan.

[0185] Therefore, to avoid the aforementioned temperature rise of silicone oil due to its flow, engineers have incorporated heat dissipation mechanisms into the design of silicone oil fans to help dissipate heat generated by friction. Typically, silicone oil fans have a temperature ceiling for heat dissipation; the temperature of the silicone oil must not exceed this ceiling. If the silicone oil temperature exceeds this ceiling, the silicone oil fan will overheat, affecting its performance and lifespan, and in severe cases, potentially causing it to malfunction.

[0186] The following explains how to determine the target required speed of the silicone oil fan when the actual engine speed is greater than or equal to the preset engine speed.

[0187] In one 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.

[0188] When the actual engine speed is greater than or equal to the preset engine speed, the speed of the silicone oil fan, which is a component for cooling the engine and vehicle, will affect the speed of the silicone oil fan. If the temperature of the silicone oil fan exceeds its upper temperature limit during operation, the silicone oil inside will deteriorate. Therefore, to prevent the temperature of the silicone oil fan from exceeding this upper temperature limit, technicians typically pre-determine a theoretical thermal protection zone for the silicone oil fan. Specifically, when the silicone oil fan operates outside this theoretical thermal protection zone for an extended period, the theoretical thermal equilibrium point of the silicone oil temperature will not exceed 230°C. Conversely, when the silicone oil fan operates within the theoretical thermal protection zone for a long period, once the silicone oil temperature reaches equilibrium, it will exceed the upper temperature limit, easily leading to performance damage to the silicone oil fan.

[0189] The preset engine speed is either automatically determined by the vehicle controller or set by technicians based on actual conditions; this application embodiment does not limit this. For example, the preset engine speed is 4300 rpm.

[0190] In this embodiment of the 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 within the thermal protection zone, and the target required speed of the silicone oil fan is determined from multiple speeds outside the thermal protection zone.

[0191] To provide a more detailed explanation of the above embodiments, the following description is divided into several parts.

[0192] The first part explains the thermal protection zone of the silicone oil fan.

[0193] For example, such as Figure 4 As shown, Figure 4 The shaded area is the thermal protection area of ​​the silicone oil fan in this embodiment.

[0194] Technicians discovered through experiments that when the engine speed is 4300 rpm, the silicone oil fan operates in the aforementioned thermal protection zone, causing the temperature of the silicone oil inside the fan to rise sharply, exceeding the theoretical thermal equilibrium point of the silicone oil. Since the actual operating speed of the silicone oil fan is adjusted according to the required speed, the fact that the silicone oil fan is in the thermal protection zone means that the required speed of the silicone oil fan is within the thermal protection zone.

[0195] Based on this, technicians conducted experiments to determine multiple fan speeds that ensured the temperature of the silicone oil inside the silicone oil fan did not exceed the theoretical thermal equilibrium point when the engine speed exceeded 4300 rpm, as well as the highest speed achievable under normal engine operating conditions (4300 rpm). Figure 1 (The speed is 6000 rpm), and the above-mentioned thermal protection zone is preset.

[0196] like Figure 1 As shown, the thermal protection zone has four boundary lines: an upper boundary line, a lower boundary line, a left boundary line, and a right boundary line. In this embodiment, the left boundary line corresponds to multiple engine speeds greater than or equal to 4300 rpm, the right boundary line corresponds to an engine speed of 6000 rpm, the upper boundary line corresponds to a fan speed of 4150 rpm, and the lower boundary line corresponds to multiple fan speeds. The upper boundary line can be considered as the "highest speed line of the thermal protection zone," and the lower boundary line can be considered as the "lowest speed line of the thermal protection zone." 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.

[0197] Table 7 is a schematic table showing the maximum and minimum speed lines of the thermal protection zone provided in the embodiments of this application, corresponding to the various fan speeds.

[0198] Table 7

[0199] In addition to the maximum and minimum speed lines corresponding to the thermal protection zone, silicone oil fans also have corresponding maximum and minimum speeds. The maximum speed (i.e., Figure 4 The maximum fan speed (in the text) is the theoretically achievable upper speed limit for a silicone oil fan during operation, while the minimum speed (i.e., the lowest speed) is... Figure 4 The minimum fan speed (in the figure) is the theoretically achievable lower limit of the speed of a silicone oil fan during operation.

[0200] It should be understood that during vehicle engine operation, due to the mechanical connection between the silicone oil fan and the engine, even under low demand conditions, the silicone oil fan cannot completely stop as long as the engine is running; it will rotate along with the belt connecting the silicone oil fan and the engine. Therefore, the silicone oil fan speed will not completely drop to 0 rpm during operation, but will maintain a minimum speed, which is the "minimum silicone oil fan speed" (i.e., the second target demand speed). In this embodiment, the minimum silicone oil fan speed is set to 200 rpm.

[0201] Regarding the maximum speed of the silicone oil fan (i.e., the first target required speed), the maximum speed that the silicone oil fan can achieve varies depending on the engine speed when driving the silicone oil fan. Generally, due to the mechanical connection between the engine and the silicone oil fan, there is a fixed transmission ratio between the engine speed and the silicone oil fan speed, approximately 1:1.2-1.4. That is, when the engine speed is 1000 rpm, the silicone oil fan speed is 1200-1400 rpm. However, during actual vehicle operation, environmental factors must be considered, and technicians need to limit the silicone oil fan speed to avoid excessively high silicone oil temperatures. Therefore, in this embodiment, technicians can recalibrate the maximum speed of the silicone oil fan by considering various influencing factors.

[0202] It should be understood that at the same engine speed, when a vehicle is at different altitudes, the atmospheric pressure around the silicone oil fan will vary, resulting in different fan speeds. In other words, both the vehicle's altitude and the engine speed can affect the silicone oil fan's speed.

[0203] Based on this, in the embodiments of this application, technicians can pre-calibrate the rotational speed of the silicone oil fan at different altitudes and different engine speeds according to the actual driving scenarios of the vehicle, and record it as the "basic rotational speed of the silicone oil fan".

[0204] Table 8 is a schematic table of the rotational speed of the silicone oil fan corresponding to different altitudes and different engine speeds in the embodiments of this application.

[0205] Table 8

[0206] For example, as shown in Table 8, the effect of different altitudes on the speed of the silicone oil fan is caused by different atmospheric pressures. Therefore, different atmospheric pressures are used to represent different altitudes in Table 8. m represents the atmospheric pressure (kPa) corresponding to different altitudes, and n represents different engine speeds. Table 8 shows the base speed of the silicone oil fan under different atmospheric pressures and different engine speeds. As can be seen from Table 8, when the altitude is constant, the higher the engine speed, the higher the base speed of the silicone oil fan. This is because an increase in engine speed is usually accompanied by higher cooling requirements, thus requiring a corresponding increase in the speed of the silicone oil fan to meet these higher cooling demands.

[0207] It should be understood that at the same altitude, a vehicle can have multiple different speeds, and these different speeds will affect the rotational speed of the silicone oil fan. Therefore, in this embodiment, vehicle speed can be used as the first influencing factor on the rotational speed of the silicone oil fan. Multiple second correction coefficients are pre-set for multiple vehicle speeds and multiple altitudes, and the rotational speed of the silicone oil fan in Table 8 is corrected according to the second correction coefficients.

[0208] Table 9 is a schematic table of the second correction coefficients for the rotational speed of the silicone oil fan at different altitudes and vehicle speeds, provided in the embodiments of this application.

[0209] Table 9

[0210] For example, as shown in Table 9, c represents the atmospheric pressure corresponding to different altitudes, and d represents different vehicle speeds. Table 9 shows that the second correction factor for the silicone oil fan speed varies at different altitudes and vehicle speeds.

[0211] Furthermore, at the same engine speed, the road gradient varies depending on the road conditions during vehicle operation. Therefore, in this embodiment, in addition to correcting the base speed of the silicone oil fan by vehicle speed, the gradient can also be used as a second influencing factor on the base speed of the silicone oil fan. Multiple third correction coefficients are pre-set for multiple vehicle speeds and multiple altitudes, and the base speed of the silicone oil fan in Table 8 is corrected according to the multiple third correction coefficients.

[0212] Table 10 is an illustrative table of the third correction coefficients corresponding to different engine speeds and different slopes provided in the embodiments of this application.

[0213] Table 10

[0214] For example, as shown in Table 10, x represents different slopes and y represents different engine speeds. Table 10 shows that the third correction factor for the first target speed requirement of the silicone oil fan also differs under different slopes and engine speeds.

[0215] Based on the second and third correction coefficients determined under different altitudes, engine speeds, vehicle speeds, and slopes, the base 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).

[0216] Specifically, the first target required speed = base speed × second correction factor × third correction factor During actual driving, the vehicle can determine the base speed of the silicone oil fan by referring to Table 8 based on the current engine speed and altitude. Then, using the current altitude and vehicle speed, it can obtain the second correction factor corresponding to the base speed from Table 9. Finally, it can obtain the third correction factor by using the current engine speed and the slope of the road. Multiplying these three factors together yields the first target required speed under the current driving conditions.

[0217] like Figure 4 As shown, the "first target speed requirement of the silicone oil fan" curve is the curve showing the change of the maximum speed of the silicone oil fan at multiple consecutive moments during a single vehicle journey.

[0218] It should be noted that, Figure 4 In the first target speed requirement curve for the silicone oil fan, when the engine speed is 5000 rpm, the maximum fan speed (first target speed requirement) corresponds to approximately 4250 rpm. However, Table 8 shows that when the engine speed is 5000 rpm, the base speed of the silicone oil fan is only 2300 rpm. Since both the first and second correction coefficients are at most 1, this means that if the base speed, the first correction coefficient, and the second correction coefficient are used, the first target speed requirement for the silicone oil fan will inevitably be less than or equal to 2300 rpm. Figure 4 The discrepancy in the curve is due to the fact that the base speed of the silicone oil fan in Table 8 was intentionally set lower by the technicians during actual vehicle testing, taking into account the influence of the thermal protection zone. The purpose was to prevent the silicone oil in the silicone oil fan from overheating when the engine speed is high. 4250rpm, on the other hand, is the theoretical maximum fan speed without considering the influence of the thermal protection zone.

[0219] 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." The maximum speed of the thermal protection zone is less than the maximum speed of the silicone oil fan, and its corresponding engine speed is approximately 4300 rpm. Similarly, the thermal protection zone corresponds to a minimum speed (the second target required speed), called the "minimum speed of the thermal protection zone." The minimum speed of the thermal protection zone is greater than the minimum speed of the silicone oil fan.

[0220] 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 is defined by the highest engine speed within the thermal protection zone. As the engine speed increases, the speed of the silicone oil fan decreases; this boundary line forms the "highest engine speed line of the thermal protection zone." The lower boundary line is defined by the lowest engine speed within the thermal protection zone. As the engine speed increases, the speed of the silicone oil fan decreases; this boundary line forms the "lowest engine speed line of the thermal protection zone."

[0221] The second part explains how, 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.

[0222] It should be understood that, without considering the operating 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, excessively high silicone oil temperatures will affect the performance of the silicone oil fan. Therefore, in this embodiment, to prevent the operating 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 within the thermal protection zone, i.e., the preset speed range.

[0223] For example, the preset engine speed is 4300 rpm.

[0224] The silicone oil fan can only be in its thermal protection zone when the engine speed is greater than or equal to 4300 rpm. In other words, when the engine speed is less than 4300 rpm, the silicone oil fan cannot possibly operate in its thermal protection zone. Therefore, the ECM will only further determine whether the required speed is within the thermal protection zone when the engine speed is greater than or equal to 4300 rpm.

[0225] The speed of a silicone oil fan is closely related to the engine speed. This is because the silicone oil fan is connected to the engine's crankshaft or camshaft via a belt. The engine's rotation is transmitted to the silicone oil fan through the belt. Therefore, the silicone oil fan speed is directly affected by the engine speed.

[0226] In one possible implementation, if 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, which is the maximum speed that matches the altitude at which the vehicle is located.

[0227] It should be understood that if the target speed of the silicone oil fan exceeds the maximum speed of the thermal protection zone, the silicone oil in the fan may deteriorate. To avoid this problem, the target speed needs to be controlled within the thermal protection zone.

[0228] In this implementation, if 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, which would result in poor heat dissipation and prevent the silicone oil from deteriorating.

[0229] In one possible implementation, if the target required speed is less than the second target required speed, the current speed of the silicone oil fan is adjusted to the second target required speed, which is the minimum speed matched according to the current operating conditions of the vehicle.

[0230] It should be understood that during vehicle engine operation, due to the structural relationship between the silicone oil fan and the engine, not all the silicone oil in the silicone oil fan can be discharged to the oil reservoir. Therefore, even under low engine demand, as long as the engine is running, the silicone oil fan cannot completely stop and will rotate along with the belt. Consequently, the silicone oil fan speed will not completely drop to 0 rpm during operation, but will maintain a minimum operating speed.

[0231] In this implementation, if the target required speed is less than the second target required speed, the current speed of the silicone oil fan is adjusted to the second target required speed to achieve good heat dissipation.

[0232] Step 303: Correct the target required speed based on the actual engine speed and the second control parameter.

[0233] It should be understood that when a vehicle is driven in a high-altitude environment, the low air pressure and low air density in the high-altitude area reduce the torque of the silicone oil fan blades. This results in an increase in the full-engagement speed of the silicone oil fan, a decrease in slip, and a drop in clutch return oil pressure and speed. Consequently, the silicone oil fan may be difficult to disengage and remain in a fully engaged speed state. If the silicone oil fan remains in a fully engaged speed state, the feedback control of the silicone oil fan may fail or its sensitivity may decrease, leading to system overcooling. To solve the above problems, the target speed is adjusted based on the actual engine speed and the second control parameter.

[0234] In one possible implementation, when the vehicle's altitude is 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 vehicle's current altitude is determined based on the vehicle's altitude. A second control parameter for the target speed is determined based on the engine's actual speed, the target required speed, and the actual speed of the silicone oil fan. This second control parameter includes a proportional control parameter, an integral control parameter, and a derivative control parameter. The target required speed is then corrected based on the second correction coefficient and the second control parameter.

[0235] Specifically, when the vehicle's altitude is higher than or equal to the first preset altitude but lower than or equal to the second preset altitude, it indicates that the vehicle is traveling in a high-altitude area. In this case, the electronically controlled silicone oil clutch fan operates in a fully engaged state. Due to the smaller slip, the return oil pressure decreases, leading to a reduction in clutch speed regulation sensitivity. To avoid these problems, the target required speed is adjusted for different altitudes.

[0236] To provide a more detailed explanation of the above embodiments, the following description is divided into several parts.

[0237] The first part explains how, when the vehicle's altitude is higher than or equal to the first preset altitude and lower than or equal to the second preset altitude, the second correction coefficient corresponding to the vehicle's current altitude is determined based on the vehicle's current altitude.

[0238] It is understandable that the specific implementation of determining the second correction system corresponding to the current altitude of the vehicle based on the vehicle's altitude can be found in Tables 8-9 above, and will not be repeated here.

[0239] The second part explains the second control parameter for determining the target speed based on the actual engine speed, the target required speed, and the actual speed of the silicone oil fan. This second control parameter includes proportional control parameters, integral control parameters, and derivative control parameters. The part also explains the correction of the target required speed based on the second correction coefficient and the second control parameter.

[0240] Specifically, in the embodiments of this application, the ECM controls the rotation speed of the silicone oil fan based on the proportional-integral-derivative (PID) method.

[0241] Based on the actual speed of the silicone oil fan, the target required speed, and the engine speed, determine the target proportional coefficient, target integral coefficient, and target derivative coefficient corresponding to the silicone oil fan speed adjustment; The target duty cycle of the silicone oil fan is determined based on the target proportional coefficient, target integral coefficient, target differential coefficient, and the basic duty cycle of the silicone oil fan. The operation of the silicone oil fan is controlled according to the target duty cycle so that the speed of the silicone oil fan is adjusted from the actual speed to the target required speed.

[0242] The specific calculation formula for PID is shown below.

[0243]

[0244] In the above formula: e(t): speed error, that is, the difference between the target required speed and the actual speed; Kp: proportional coefficient P; Kp / Ti: integral coefficient I; Kp·Td: derivative coefficient D; u(t): PID output, usually a unitless value.

[0245] When performing PID control on a silicone oil fan, the second control parameters include proportional control parameters, integral control parameters, and derivative control parameters. During the adjustment process, the ECM also needs to consider the engine speed.

[0246] Specifically, at any moment during the adjustment process, the ECM can obtain the actual speed of the silicone oil fan at the current moment through the speed sensor of the silicone oil fan, and calculate the difference between the actual speed and the target required speed, i.e., e(t) in formula (1).

[0247] In the embodiments of this application, technicians can pre-set the proportional coefficient P, integral coefficient I, and derivative coefficient D corresponding to different engine speeds based on experiments.

[0248] Tables 11-13 are illustrative tables showing the correspondence between the proportional coefficient P, integral coefficient I, and derivative coefficient D at different engine speeds, as provided in the embodiments of this application.

[0249] Table 11

[0250] For example, as shown in Table 11, s represents the engine speed, and w represents e(t). Table 9 shows the proportionality coefficient P (×10) for different engine speeds and different e(t). -4 ).

[0251] Table 12

[0252] For example, as shown in Table 12, s represents the engine speed, and w represents e(t). Table 6 shows the integral coefficient I (×10) for different engine speeds and different e(t). -6 ).

[0253] Table 13

[0254] For example, as shown in Table 13, x represents the engine speed, and y represents e(t). Table 11 shows the corresponding differential coefficients D (×10) for different engine speeds and different e(t). -3 ).

[0255] 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, based on the difference between the actual speed and the target required speed, and the engine speed, the proportional control parameters, integral control parameters, and derivative control parameters for that adjustment moment are obtained by referring to Tables 11-13 above.

[0256] After obtaining the proportional control parameters, integral control parameters, and derivative control parameters, the ECM can calculate the PID output u(t) according to the above formula. This is also the second control parameter.

[0257] After calculating the PID output u(t), the ECM can normalize u(t) and convert it into a duty cycle to correct for the target required speed.

[0258] Step 304: Adjust the current speed of the silicone oil fan to the target required speed.

[0259] After obtaining the target required speed of the silicone oil fan, the ECM can control the operation of the silicone oil fan based on the target required speed.

[0260] It should be understood that in practical applications, the speed of the silicone oil fan changes in real time. In order to reduce the real-time error of the silicone oil fan speed, the target required speed of the silicone oil fan is corrected.

[0261] 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, the basic silicone oil quantity 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 for the target required speed is determined, the first control parameter being used to correct for errors in the target required speed; the basic silicone oil quantity is corrected based on the first control parameter to obtain the target silicone oil quantity of the silicone oil fan; based on the target silicone oil quantity of the silicone oil fan, the current speed of the silicone oil fan is adjusted to the target required speed.

[0262] The base silicone oil level is a pre-set silicone oil level, referring to the default silicone oil level of the silicone oil fan without any additional control input. The base silicone oil level provides a reasonable initial state for PID control and is a static silicone oil level.

[0263] The first control parameters include proportional control parameters, integral control parameters, and derivative control parameters.

[0264] In this possible implementation, since the first control parameter is used to correct the error of the target required speed, the target amount of silicone oil for the silicone oil fan can be obtained by correcting the basic silicone oil amount based on the first control parameter; based on the target amount of silicone oil for the silicone oil fan, the current speed of the silicone oil fan is adjusted to the target required speed, thereby meeting the vehicle's heat dissipation requirements.

[0265] To provide a more detailed explanation of the above embodiments, the following description is divided into several parts.

[0266] The first part explains the content of the first control parameter for determining the target speed based on the actual engine speed, the target required speed, and the current speed of the silicone oil fan.

[0267] It is understandable that the relevant content for determining the first control parameter of the target required speed can be found in the description of the previous steps for determining the second control parameter, and will not be repeated here.

[0268] The first control parameter is obtained by calculating the PID output u(t) based on the proportional control parameter, integral control parameter, and derivative control parameter.

[0269] The second part explains how to correct the base amount of silicone oil based on the first control parameter to obtain the target amount of silicone oil for the silicone oil fan.

[0270] It should be understood that the duty cycle obtained by normalizing u(t) above is the adjustment duty cycle calculated by the ECM based on the difference between the actual speed of the silicone fan and the target required speed at the current adjustment moment. Correspondingly, silicone fans generally also have a base duty cycle. The base duty cycle is preset and refers to the default duty cycle of the silicone fan without any additional control input. The base duty cycle provides a reasonable initial state for PID regulation and is a static duty cycle, while the adjustment duty cycle is dynamic and is adjusted according to the real-time speed error. When controlling a silicone fan, the actual duty cycle used to control the silicone fan is equal to the sum of the base duty cycle and the adjustment duty cycle.

[0271] Specifically, in the embodiments of this application, technicians can pre-set multiple sets of correspondence tables between engine speed, target required speed of silicone oil fan and basic duty cycle based on engine speed and target required speed of silicone oil fan.

[0272] Table 14 is an illustrative table showing the correspondence between different engine speeds, different target required speeds, and basic duty cycles provided in the embodiments of this application.

[0273] Table 14

[0274] For example, as shown in Table 14, after determining the adjustment duty cycle of the PID output, the ECM can look up the base duty cycle corresponding to the current adjustment time in Table 14 using the engine speed and the target required speed at the current adjustment moment. The base duty cycle and the adjustment duty cycle are then added together to obtain the final target duty cycle, which is the actual duty cycle 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 silicone oil fan speed.

[0275] In some embodiments, the ECM determines the target amount of silicone oil based on the target duty cycle in order to control the speed of the silicone oil fan.

[0276] The third part involves adjusting the current speed of the silicone oil fan to the target required speed based on the target amount of silicone oil.

[0277] In some embodiments, after determining the target amount of silicone oil for the silicone oil fan, the ECU controls the valve of the silicone oil fan's oil reservoir to open, thereby controlling the flow of the target amount of silicone oil into the working chamber of the silicone oil fan, and thus adjusting the speed of the silicone oil fan.

[0278] This application provides a control method for a silicone oil fan. This method acquires engine parameters, vehicle driving parameters, and a first required speed of the vehicle's control unit. The first required speed includes the speed of the silicone oil fan required by the control unit in the vehicle's powertrain. Based on the engine parameters, driving parameters, and the first required speed of the control unit, a target required speed of the silicone oil fan is determined. This target required speed is the speed matched to the vehicle's current operating conditions. That is, when multiple components in the vehicle have required speeds, the maximum required speed is determined as the target required speed. This target required speed is then corrected to make it more accurate, and the current speed of the silicone oil fan is adjusted to the target required speed to increase the cooling capacity of the silicone oil fan, enabling it to provide good cooling for multiple components in the vehicle.

[0279] Figure 5 This application provides a control device for a silicone oil fan.

[0280] For example, Figure 5 As shown, the device 500 includes: The acquisition module 501 is used to acquire the vehicle's engine parameters, vehicle driving parameters, and the first required speed of the vehicle's control unit. The first required speed includes the speed of the silicone oil fan required by the control unit in the vehicle's power system. The determination module 502 is used to determine the target required speed of the silicone oil fan based on 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 operating conditions of the vehicle. The engine parameters are used to describe the state of the engine during operation. The adjustment module 503 is used to adjust the current speed of the silicone oil fan to the target required speed.

[0281] In one possible implementation, the device 500 further includes: The determination module 502 is used to determine the second required speed of the silicone oil fan based on the engine coolant temperature and vehicle speed; The determination module 502 is used to determine the third required speed of the silicone oil fan based on the actual intake air temperature of the engine, the deviation between the actual intake air temperature of the engine and the target intake air temperature of the engine, and the vehicle speed. The determination module 502 is used to determine the fourth required speed of the silicone oil fan based on the transmission oil temperature; The determining module 502 is used to determine the largest demand speed among the first demand speed, the second demand speed, the third demand speed, and the fourth demand speed as the target demand speed of the silicone oil fan.

[0282] In one possible implementation, the device 500 further includes: The reference speed determination module is used to determine the reference speed of the silicone oil fan based on the actual intake air temperature of the engine and the deviation between the actual intake air temperature and the target intake air temperature of the engine. The correction factor determination module is used to determine the first correction factor based on the deviation between the actual intake air temperature of the engine and the target intake air temperature of the engine and the vehicle speed. The multiplication module is used to multiply the reference speed by the first correction factor to obtain the third required speed of the silicone oil fan.

[0283] In one possible implementation, the device 500 further includes: The acquisition module is used to acquire the actual engine speed and the current speed of the silicone oil fan; The silicone oil quantity determination module is used to determine the basic silicone oil quantity of the silicone oil fan based on the actual engine speed and the target required speed. The control parameter determination module is used to determine the first control parameter of the target speed based on the actual engine speed, the target required speed and the current speed of the silicone oil fan. The first control parameter is used to correct the error of the target required speed. The correction module is used to correct the basic silicone oil quantity based on the first control parameter in order to obtain the target silicone oil quantity for the silicone oil fan. The adjustment module 503 is used to adjust the current speed of the silicone oil fan to the target required speed based on the target amount of silicone oil in the silicone oil fan.

[0284] In one possible implementation, the device 500 further includes: The module for determining sound wave demand parameters is used to determine the sound wave demand 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 wave function is activated. The vehicle's sound wave function is used to control the silicone oil fan to create sound wave effects. The determining module 502 is used to determine the maximum demand speed among the first demand speed, the second demand speed, the third demand speed, the fourth demand speed, and the noise demand parameter of the silicone oil fan as the target demand speed of the silicone oil fan.

[0285] In one possible implementation, the device 500 further includes: The determination module 502 is used to determine the required engine speed based on the engine coolant temperature and the actual intake air temperature when the actual engine speed is idling; and to determine the target required speed of the silicone oil fan based on the required engine speed and the preset speed ratio between the engine and the silicone oil fan. 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.

[0286] In one possible implementation, the device 500 further includes: The correction coefficient determination module is used to determine the second correction coefficient corresponding to the current altitude of the vehicle, based on the vehicle's altitude, when the vehicle's altitude is higher than or equal to the first preset altitude and lower than or equal to the second preset altitude. The correction coefficient determination module is used to determine the second control parameter of the target 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 proportional control parameter, integral control parameter and derivative control parameter. The correction module is used to correct the target required speed based on the second correction coefficient and the second control parameter.

[0287] In one possible implementation, the device 500 further includes: The adjustment module 503 is used to adjust the current speed of the silicone oil fan to the first target speed when the target required speed is greater than the first target required speed. The first target required speed is the maximum speed that matches the altitude of the vehicle. The adjustment module 503 is used to adjust the current speed of the silicone oil fan to the second target 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 operating conditions of the vehicle.

[0288] Figure 6 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this application.

[0289] For example, such as Figure 6 As shown, the vehicle 600 includes a memory 601 and a processor 602. The memory 601 stores 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.

[0290] Furthermore, embodiments of this application also protect an apparatus that may include a memory and a processor, wherein the memory stores executable program code, and the processor is used to call and execute the executable program code to perform a control method for a silicone oil fan provided in embodiments of this application.

[0291] This embodiment can divide the device into functional modules based on the above method example. For example, each module can correspond to a separate function, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware. It should be noted that the module division in this embodiment is illustrative and only represents one logical functional division. In actual implementation, there may be other division methods.

[0292] When each function is divided into modules corresponding to its function, the device may further include a module for determining the correction coefficient, a correction module, and a module for determining the amount of silicone oil. It should be noted that all relevant content regarding the steps involved in the above method embodiments can be referenced from the functional descriptions of the corresponding modules, and will not be repeated here.

[0293] It should be understood that the device provided in this embodiment is used to execute the above-described control method for a silicone oil fan, and therefore can achieve the same effect as the above-described implementation method.

[0294] When using 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 can be used to control and manage the vehicle's movements. The storage module can be used to support the vehicle in executing relevant program code.

[0295] The processing module may be a processor or a controller, which can implement or execute various exemplary logic blocks, modules, and circuits shown in conjunction with the disclosure of this application. The processor may also be a combination of functions that implement computing capabilities, such as a combination of one or more microprocessors, a combination of digital signal processing (DSP) and microprocessors, etc., and the storage module may be a memory.

[0296] In addition, the device provided in the embodiments of this application may specifically be a chip, component or module. The chip may include a connected processor and a memory. The memory is used to store instructions. When the processor calls and executes the instructions, the chip can execute a silicone oil fan control method provided in the above embodiments.

[0297] This embodiment also provides a computer-readable storage medium storing computer program code. When the computer program code is run on a computer, the computer executes the above-described related method steps to implement the silicone oil fan control method provided in the above embodiment.

[0298] This embodiment also provides a computer program product that, when run on a computer, causes the computer to perform the aforementioned related steps to implement a silicone oil fan control method provided in the above embodiment.

[0299] In this embodiment, the device, computer-readable storage medium, computer program product, or chip are all used to execute the corresponding methods provided above. Therefore, the beneficial effects they can achieve can be referred to the beneficial effects in the corresponding methods provided above, and will not be repeated here.

[0300] Through the above description of the embodiments, those skilled in the art will understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above 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.

[0301] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0302] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the 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; 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 the current working condition of the vehicle, and the engine parameter is used to describe the state of the engine during operation; 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 engine parameters include engine water temperature, actual engine intake temperature and transmission oil temperature, the driving parameters include vehicle speed, and determining a target required speed of the silicone oil fan based on the engine parameters, the driving parameters and a 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; 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.

3. The method according to claim 2, characterized in that 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; The reference rotation speed is multiplied by the first correction coefficient to obtain a third required rotation speed of the silicone oil fan.

4. 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.

5. The method according to claim 2, 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.

6. 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.

7. 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.

8. 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.

9. 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, 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 of the engine during operation; The adjustment module is used to adjust the current rotation speed of the silicone oil fan to a target required rotation speed.

10. 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 8.

11. 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 8 is implemented.

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