Silicone oil fan control method, silicone oil fan control device and vehicle

Abstract

The present invention discloses a control method for a silicone oil fan, a control device for a silicone oil fan and a vehicle. The control method for the silicone oil fan comprises: obtaining operating parameters of the engine and operating parameters of a vehicle air conditioner to determine a target speed of the silicone oil fan; obtaining an actual speed of the silicone oil fan and determining a speed deviation from the target speed of the silicone oil fan; obtaining a response time of the silicone oil fan; and adjusting the speed of the silicone oil fan in real time according to the speed deviation between the actual speed of the silicone oil fan and the target speed and according to the response time of the silicone oil fan.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to a control method for a silicone oil fan, a control device for a silicone oil fan, and a vehicle. Background Art

[0002] Cooling fans are widely used in the automotive industry to cool vehicle engines, air conditioner condensers, etc. because of their controllable speed, high control accuracy and speed adjustment range, as well as low power consumption and good heat dissipation performance.

[0003] In the related art, the water pump and fan of the engine use a mechanical water pump and a direct-connected fan, which are driven by a belt and the engine crankshaft and have a fixed transmission ratio. At each engine speed, the auxiliary power of the water pump and the fan is constant, and the adjustability is poor, which is not conducive to the precise thermal management control of the engine. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a control method for a silicone oil fan, which can control the on-off of the silicone oil fan and adjust the speed of the silicone oil fan in real time according to the speed deviation between the actual speed of the silicone oil fan and the target speed and according to the response time of the silicone oil fan.

[0005] The invention also provides a control device for the silicone oil fan.

[0006] The present invention also provides a vehicle.

[0007] According to the first aspect of the present invention, a control method for a silicone oil fan is provided for dissipating heat from an engine, comprising: obtaining operating parameters of the engine and operating parameters of a vehicle air conditioner to determine a target speed of the silicone oil fan; obtaining an actual speed of the silicone oil fan and determining a speed deviation from the target speed of the silicone oil fan; obtaining a response time of the silicone oil fan; and adjusting the speed of the silicone oil fan in real time according to the speed deviation between the actual speed of the silicone oil fan and the target speed and according to the response time of the silicone oil fan.

[0008] According to the control method of the silicone oil fan of the embodiment of the present invention, compared with the existing structure in which the mechanical fan is directly connected to the engine, the silicone oil fan in the present invention is connected to the engine through the silicone oil medium, has the characteristics of controllable speed, high control accuracy and speed adjustment range, low power consumption and good heat dissipation performance. Moreover, for the control method of the mechanical fan, generally only the final speed is output after re-correction based on the deviation between the target speed and the actual speed. The present invention is different from this. The present invention not only makes a comprehensive judgment based on the deviation value between the target speed and the actual speed, but also makes a comprehensive correction based on the responsiveness of the silicone oil fan and the rotation stability of the silicone oil fan. According to the above-mentioned multiple factors, a speed value suitable for the steady-state rotation of the silicone oil fan can be determined, thereby ensuring that the silicone oil fan can show good followability and controllability at different target speeds, and the corresponding coolant temperature, intercooler outlet temperature, etc. can meet the heat dissipation requirements of the engine.

[0009] According to some embodiments of the present invention, the step of obtaining the operating parameters of the engine and the operating parameters of the vehicle air conditioner to determine the target speed of the silicone oil fan also includes: comparing the requested speed determined according to the operating parameters of the engine with the requested speed determined according to the operating parameters of the vehicle air conditioner, and selecting the largest requested speed value as the requested speed of the silicone oil fan.

[0010] According to some embodiments of the present invention, the step of obtaining the operating parameters of the engine and the operating parameters of the vehicle air conditioner to determine the target speed of the silicone oil fan also includes: comparing the requested speed of the silicone oil fan with the maximum allowable speed of the silicone oil fan, and selecting the smaller speed value as the target speed of the silicone oil fan.

[0011] According to some embodiments of the present invention, the target speed of the silicone oil fan is controlled according to a duty cycle at each pre-calibrated target speed and output as a final speed of the silicone oil fan.

[0012] According to some embodiments of the present invention, the final speed of the silicone oil fan is adjusted in real time according to pre-calibrated proportional-integral control parameters based on the response time of the silicone oil fan and the deviation between the actual speed of the silicone oil fan and the final speed.

[0013] According to some embodiments of the present invention, the step of adjusting the final speed of the silicone oil fan in real time according to pre-calibrated proportional-integral control parameters based on the response time of the silicone oil fan and the deviation between the actual speed and the final speed of the silicone oil fan also includes: presetting a set of proportional-integral control parameters; determining the input speed of the engine; changing the cooling requirement of the engine, obtaining the response time of the silicone oil fan and obtaining the final speed and actual speed of the silicone oil fan; adjusting the proportional-integral control parameters according to the response time of the silicone oil fan and the deviation between the actual speed and the final speed, and recalibrating the adjusted proportional-integral control parameter values ​​until the speed deviation of the silicone oil fan at different final speeds is controlled within the calibrated proportional-integral control parameters.

[0014] According to some embodiments of the present invention, the operating parameters of the engine include: a water temperature parameter of the engine to determine a first requested speed of the silicone oil fan; and / or an oil temperature parameter of the engine to determine a second requested speed of the silicone oil fan.

[0015] According to some embodiments of the present invention, the operating parameter of the air conditioner includes: acquiring an outlet pressure parameter of the air conditioner condenser to determine a third requested speed of the silicone oil fan.

[0016] According to the second aspect of the present invention, a control device for a silicone oil fan includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the control method are implemented.

[0017] A vehicle according to an embodiment of the third aspect of the present invention comprises: a silicone oil fan and a control device for the silicone oil fan, wherein the silicone oil fan operates according to the control method for the silicone oil fan.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 The control process of the silicone oil fan according to the embodiment of the present invention is as follows: Figure 1 ;

[0021] Figure 2 The control process of the silicone oil fan according to the embodiment of the present invention is as follows: Figure 2 . DETAILED DESCRIPTION

[0022] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0023] Reference below Figure 1-Figure 2 A control method for a silicone oil fan according to an embodiment of the present invention is described, and the present invention also proposes a control device and a vehicle for a silicone oil fan having the control method.

[0024] About the working principle of the silicone oil fan: The fan silicone oil enters the working chamber through the silicone oil port from the oil storage chamber below the silicone oil port using the centrifugal force generated by the high-speed rotation of the driving shaft. The engine controller controls the opening of the clutch valve to determine the amount of silicone oil in the silicone oil port, and the shear torque generated by the silicone oil is used to transmit torque through the driving shaft to drive the fan on the rear cover to rotate. The silicone oil then flows back to the oil storage chamber through the oil return route due to relative centrifugal force.

[0025] The engine crankshaft is connected to the crankshaft pulley, the crankshaft pulley is connected to the water pump pulley through a transmission belt, the silicone oil fan is connected to the water pump pulley, the water pump pulley is fixed to the water pump housing, and the water pump housing is installed on the engine cylinder block. The crankshaft pulley drives the water pump pulley to rotate, and the water pump pulley drives the silicone oil fan and the water pump impeller to rotate.

[0026] like Figure 1-Figure 2 As shown, the control method of the silicone oil fan includes: obtaining the operating parameters of the engine and the operating parameters of the vehicle air conditioner to determine the target speed of the silicone oil fan; obtaining the actual speed of the silicone oil fan, and determining the speed deviation from the target speed of the silicone oil fan; obtaining the response time of the silicone oil fan; and adjusting the speed of the silicone oil fan in real time according to the speed deviation between the actual speed of the silicone oil fan and the target speed, and according to the response time of the silicone oil fan.

[0027] Since the operating conditions of the engine and the vehicle air conditioner are the two major factors that affect the silicone oil fan, the target speed of the silicone oil fan can be determined by obtaining the operating parameters of the engine, such as the water temperature, oil temperature, and air outlet temperature of the engine, and by obtaining the operating parameters of the vehicle air conditioner, such as the outlet pressure and outlet temperature of the vehicle air conditioner condenser. After determining the target speed of the silicone oil fan, the silicone oil fan rotates according to the above cooling requirements to cool the engine of the vehicle, the condenser of the vehicle air conditioner, etc. During the use of the silicone oil fan, since the speed is limited by the engine speed and changes with the fluctuation of the engine speed during operation, therefore, during this operation, the speed deviation between the actual speed of the silicone oil fan and the target speed is detected, that is, the followability of the silicone oil fan, and the response time of the silicone oil fan, that is, the responsiveness of the silicone oil fan, is obtained. By judging the followability and responsiveness of the silicone oil fan, the silicone oil fan can be controlled on and off and the speed of the silicone oil fan can be adjusted in real time.

[0028] Therefore, compared with the existing structure in which the mechanical fan is directly connected to the engine, the silicone oil fan in the present invention is connected to the engine through the silicone oil medium, has the characteristics of controllable speed, high control accuracy and speed adjustment range, low power consumption and good heat dissipation performance. Moreover, for the control method of the mechanical fan, generally only the final speed is output after re-correction based on the deviation between the target speed and the actual speed. The present invention is different from this. The present invention not only makes a comprehensive judgment based on the deviation value between the target speed and the actual speed, but also makes a comprehensive correction based on the above-mentioned multiple factors, and can determine the speed value suitable for the steady-state rotation of the silicone oil fan, thereby ensuring that the silicone oil fan can show good followability and controllability at different target speeds, and the corresponding coolant temperature, intercooler outlet temperature, etc. can meet the heat dissipation requirements of the engine.

[0029] Furthermore, the step of obtaining the operating parameters of the engine and the operating parameters of the vehicle air conditioner to determine the target speed of the silicone oil fan also includes: comparing the requested speed determined according to the operating parameters of the engine with the requested speed determined according to the operating parameters of the vehicle air conditioner, and selecting the largest requested speed value as the requested speed of the silicone oil fan.

[0030] That is to say, the requested speed of the corresponding parameters is determined according to the operating parameters of the engine. For example, at this time, the water temperature of the engine is T1°C, and the corresponding requested speed is V1rpm, and different water temperatures correspond to different requested speeds; and the requested speed is determined according to the operating parameters of the vehicle air conditioner. For example, at this time, the outlet temperature of the condenser of the vehicle air conditioner is T2°C, and the corresponding requested speed is V2rpm. V1rpm and V2rpm are compared, and the larger value is selected as the requested speed of the silicone oil fan, thereby ensuring effective cooling of the engine and the condenser of the vehicle air conditioner.

[0031] Furthermore, the step of obtaining the operating parameters of the engine and the vehicle air conditioner to determine the target speed of the silicone oil fan also includes: comparing the requested speed of the silicone oil fan with the maximum allowable speed of the silicone oil fan, and selecting the smaller speed value as the target speed of the silicone oil fan.

[0032] Among them, since the speed of the silicone oil fan is related to the speed of the engine, the maximum allowable speed of the silicone oil fan is first determined based on the transmission ratio between the silicone oil fan and the engine, and the corresponding allowable speed needs to be lowered under the strength limit of the silicone oil fan to avoid affecting the life of the silicone oil fan. In this way, the maximum allowable speed of the silicone oil fan can be obtained.

[0033] That is to say, the requested speed of the silicone oil fan is compared with the maximum allowable speed of the silicone oil fan, and the smaller value is selected as the target speed of the silicone oil fan. That is, if the requested speed is greater than the maximum allowable speed, the maximum allowable speed is output as the target speed of the silicone oil fan; if the maximum allowable speed is greater than the requested speed, the requested speed is output as the target speed of the silicone oil fan. This can ensure that the silicone oil fan will never run beyond the range of the maximum allowable speed, thereby ensuring the durability and controllability of the silicone oil fan.

[0034] Furthermore, the target speed of the silicone oil fan is controlled according to the duty cycle at each pre-calibrated target speed and output as the final speed of the silicone oil fan.

[0035] That is to say, the target speed is converted into the duty cycle value of PWM control, and different target speeds correspond to different duty cycle values. Among them, the engine ECU (electronic control unit) obtains the engine water temperature, inlet and outlet air temperature, engine speed, outlet temperature of the vehicle air conditioner, silicone oil fan speed and other signals, and after comprehensive sorting and calculation of the above data, outputs an electric pulse instruction to control the opening of the clutch valve plate in the silicone oil fan according to the pulse width modulation theory (PWM). The clutch valve plate here is used to adjust the size of the oil inlet hole. The larger the opening of the clutch valve plate, the more silicone oil enters the clutch working room, and the higher the speed of the silicone oil fan. In this way, by controlling the amount of silicone oil entering the clutch working room, the speed of the silicone oil fan can be changed, and this is used as the final speed of the silicone oil fan, which can well correspond to the cooling requirements of the engine. In other words, the engine ECM issues different PWM control instructions, corresponding to different voltage signals, and controls the opening size of the clutch valve plate through the size of the voltage signal, thereby adjusting the amount of silicone oil flowing into the silicone oil cavity. Different amounts of silicone oil will produce different clutch friction forces, and finally realize the control of the speed of the silicone oil fan. Among them, if the actual speed of the silicone oil fan does not match the final speed of the silicone oil fan, the engine ECU will issue an adjustment instruction through calculation until the actual speed of the silicone oil fan matches the set speed of the fan.

[0036] Furthermore, according to the response time of the silicone oil fan and the deviation between the actual rotation speed of the silicone oil fan and the final rotation speed, the final rotation speed of the silicone oil fan is adjusted in real time according to the pre-calibrated proportional-integral control parameters.

[0037] That is to say, due to the certain response lag and volatility of the silicone oil fan, that is, the actual speed fluctuates around the final speed, therefore, according to the response time of the silicone oil fan and the deviation between the actual speed and the final speed of the silicone oil fan, the final speed is adjusted in real time according to the calibrated proportional-integral control parameters to ensure that the silicone oil fan can always be adjusted to rotate within a certain speed range.

[0038] Among them, the calibrated proportional integral control parameter (i.e. PID) can be understood as the speed deviation control range of the silicone oil fan. For different final speeds of the silicone oil fan, it can always ensure that the deviation between the actual speed and the output final speed is controlled within a certain range. In this way, the silicone oil fan can have a steady-state output and can respond promptly and effectively according to the engine ECM control instructions, thereby improving the followability and responsiveness of the silicone oil fan.

[0039] Furthermore, combined with Figure 2 As shown, according to the response time of the silicone oil fan and the deviation between the actual speed and the final speed of the silicone oil fan, the step of adjusting the final speed of the silicone oil fan in real time according to the pre-calibrated proportional-integral control parameters also includes: presetting a set of proportional-integral control parameters; determining the input speed of the engine; changing the cooling demand of the engine to obtain the response time of the silicone oil fan and the final speed and actual speed of the silicone oil fan; adjusting the proportional-integral control parameters according to the response time of the silicone oil fan and the deviation between the final speed and the actual speed, and recalibrating the adjusted proportional-integral control parameter values ​​until the response time and speed deviation of the silicone oil fan at different final speeds are controlled within the calibrated proportional-integral control parameters.

[0040] That is to say, after PID confirms the input speed of the engine, it changes the cooling demand of the engine. For example, by changing the water temperature signal, the engine ECU obtains the changed water temperature signal, sorts out the calculations, and then issues a command to control the speed of the silicone oil fan. Then, the response time and actual speed of the silicone oil fan are obtained. The proportional-integral control parameters are adjusted through the speed deviation between the actual speed and the final speed. Then, the engine is continuously loaded with load to increase the speed of the engine, thereby changing the operating parameters of the engine. For example, the water temperature increases, thereby changing the final speed of the silicone oil fan. Then, according to the response time of the silicone oil fan and the speed deviation between the actual speed and the final speed, the proportional-integral control parameters are adjusted again. In this way, by adjusting the silicone oil The speed regulation characteristics of the entire fan section and the speed fluctuation can ultimately determine a set of proportional-integral control parameter values ​​that are suitable for different final speeds. The proportional-integral control parameter values ​​are relative parameter values ​​that have been calibrated and repeatedly compared and measured. In this way, for the output of different final speeds of the silicone oil fan, a set of reasonable proportional-integral control parameter values ​​can be adjusted in real time, which can not only meet the followability of the silicone oil fan, but also improve the responsiveness of the silicone oil fan. Compared with the existing fan control method that only adjusts the deviation between the actual speed and the target speed, it can ensure that the silicone oil fan can always maintain good followability and controllability at different target speeds, and the corresponding coolant temperature and intercooler outlet temperature meet the heat dissipation requirements.

[0041] Among them, the proportional-integral control parameter value will be synchronously input into the MAP in the engine ECU, and the MAP can be expressed as: a table pre-stored in the engine ECU. In other words, the proportional-integral control parameter value obtained through the above multiple test calibrations and repeated comparisons and measurements is input into the MAP, and the engine ECU outputs a control instruction after sorting and calculating according to the proportional-integral control parameter input into the MAP, so as to adjust the speed of the silicone oil fan. Moreover, the speed of the silicone oil fan can be adjusted in real time with the constantly changing proportional-integral control parameter.

[0042] In addition, the operating parameters of the engine include: a water temperature parameter of the engine to determine a first requested speed of the silicone oil fan; and / or an oil temperature parameter of the engine to determine a second requested speed of the silicone oil fan.

[0043] That is to say, the water temperature signal of the engine or the oil temperature signal of the engine can be collected to determine the corresponding requested speed. Of course, the operating parameters such as the intake temperature or exhaust temperature signal of the engine can also be collected. For example, if the collected engine water temperature signal is T3°C, the corresponding first requested speed is V3rmp, and if the collected engine oil temperature signal is T4°C, the corresponding second requested speed is V4rmp. Different water temperature signals / oil temperature signals correspond to different requested speeds.

[0044] Specifically, the requested speed of the silicone oil fan is determined according to the water temperature parameters of the engine, and a certain control range is designed. The specific reference is as follows:

[0045] When the engine water temperature T is less than 93°C and the vehicle is at any speed, the requested speed of the silicone oil fan is 0rpm;

[0046] When the engine water temperature is 93℃≤T≤112℃, the requested speed of the silicone oil fan is within 500~4000rpm;

[0047] When the engine water temperature T>112℃, the required speed of the silicone oil fan is within 4100~4200rpm.

[0048] In summary, different requested speeds of the silicone oil fan are designed according to different water temperature ranges, so as to well meet the cooling needs of the engine at different water temperatures, improve the heat dissipation performance and reduce power consumption.

[0049] Moreover, the operating parameters of the vehicle air conditioner include: obtaining an outlet pressure parameter of the vehicle air conditioner condenser to determine the third requested speed of the silicone oil fan. In this way, the outlet pressure value of the condenser of the vehicle air conditioner can be collected to determine the corresponding third requested speed. Of course, the outlet temperature value of the condenser can also be collected to determine the corresponding requested speed.

[0050] According to the second aspect of the present invention, a control device for a silicone oil fan includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the control method when executing the computer program.

[0051] A vehicle according to an embodiment of the third aspect of the present invention comprises a silicone oil fan and a control device for the silicone oil fan, wherein the silicone oil fan operates according to the control method for the silicone oil fan of the above-mentioned embodiment.

[0052] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0054] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A control method for a silicone oil fan for cooling an engine, characterized in that: include: Obtaining operating parameters of the engine and operating parameters of the vehicle air conditioner to determine a target speed of the silicone oil fan; Acquire the actual rotation speed of the silicone oil fan, and determine the rotation speed deviation from the target rotation speed of the silicone oil fan; Obtaining the response time of the silicone oil fan; According to the speed deviation between the actual speed of the silicone oil fan and the target speed, and according to the response time of the silicone oil fan, the speed of the silicone oil fan is adjusted in real time; The target speed of the silicone oil fan is controlled according to the duty ratio at each pre-calibrated target speed and then output as the final speed of the silicone oil fan; According to the response time of the silicone oil fan and the deviation between the actual rotation speed of the silicone oil fan and the final rotation speed, the final rotation speed of the silicone oil fan is adjusted in real time according to a pre-calibrated proportional-integral control parameter.

2. The control method of the silicone oil fan according to claim 1, characterized in that: The step of obtaining the operating parameters of the engine and the operating parameters of the vehicle air conditioner to determine the target speed of the silicone oil fan also includes: The requested speed determined according to the operating parameters of the engine is compared with the requested speed determined according to the operating parameters of the vehicle air conditioner, and the largest requested speed value is selected as the requested speed of the silicone oil fan.

3. The control method of the silicone oil fan according to claim 2, characterized in that: The step of obtaining the operating parameters of the engine and the operating parameters of the vehicle air conditioner to determine the target speed of the silicone oil fan also includes: The requested rotation speed of the silicone oil fan is compared with the maximum allowable rotation speed of the silicone oil fan, and the smaller rotation speed value is selected as the target rotation speed of the silicone oil fan.

4. The control method of the silicone oil fan according to claim 1, characterized in that: The step of adjusting the final speed of the silicone oil fan in real time according to a pre-calibrated proportional-integral control parameter based on the response time of the silicone oil fan and the deviation between the actual speed of the silicone oil fan and the final speed also includes: Preset a set of proportional-integral control parameters; determining an input speed of the engine; Changing the cooling requirement of the engine, obtaining the response time of the silicone oil fan, and obtaining the final speed and actual speed of the silicone oil fan; According to the response time of the silicone oil fan and the deviation between the actual speed and the final speed, the proportional-integral control parameter is adjusted, and the adjusted proportional-integral control parameter value is recalibrated until the speed deviation of the silicone oil fan at different final speeds is controlled within the calibrated proportional-integral control parameter.

5. The control method of the silicone oil fan according to claim 1, characterized in that: The operating parameters of the engine include: a water temperature parameter of the engine to determine a first requested speed of the silicone oil fan; and / or, The oil temperature parameter of the engine is used to determine the second requested speed of the silicone oil fan.

6. The control method of the silicone oil fan according to claim 1, characterized in that: The operating parameters of the air conditioner include: obtaining an outlet pressure parameter of the air conditioner condenser to determine a third requested speed of the silicone oil fan.

7. A control device for a silicone oil fan, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

8. A vehicle, characterized in that: include: A silicone oil fan and a control device for the silicone oil fan according to claim 7, wherein the silicone oil fan is operated by the control method for the silicone oil fan according to any one of claims 1 to 6.

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