CN114810857B - Method and system for controlling separation time of electric control silicone oil fan - Google Patents
Method and system for controlling separation time of electric control silicone oil fan Download PDFInfo
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- CN114810857B CN114810857B CN202210738564.XA CN202210738564A CN114810857B CN 114810857 B CN114810857 B CN 114810857B CN 202210738564 A CN202210738564 A CN 202210738564A CN 114810857 B CN114810857 B CN 114810857B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D35/00—Fluid clutches in which the clutching is predominantly obtained by fluid adhesion
- F16D35/02—Fluid clutches in which the clutching is predominantly obtained by fluid adhesion with rotary working chambers and rotary reservoirs, e.g. in one coupling part
- F16D35/021—Fluid clutches in which the clutching is predominantly obtained by fluid adhesion with rotary working chambers and rotary reservoirs, e.g. in one coupling part actuated by valves
- F16D35/024—Fluid clutches in which the clutching is predominantly obtained by fluid adhesion with rotary working chambers and rotary reservoirs, e.g. in one coupling part actuated by valves the valve being actuated electrically, e.g. by an electromagnet
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/02—Controlling of coolant flow the coolant being cooling-air
- F01P7/04—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio
- F01P7/042—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio using fluid couplings
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Abstract
The invention relates to the technical field of engines, and provides a method and a system for controlling the disengagement time of an electric control silicone oil fan, which comprises the following steps: acquiring a set fan rotating speed and an actual fan rotating speed of the electric control silicone oil fan, and determining the fan output duty ratio of the electric control silicone oil fan according to the set fan rotating speed and the actual fan rotating speed; determining the fan meshing rotating speed of the electric control silicone oil fan, judging whether the set rotating speed of the fan is greater than the fan meshing rotating speed in real time, and adjusting the fan output duty ratio of the electric control silicone oil fan in real time according to the judgment result so as to enable the fan output duty ratio to be output according to a first threshold value or a second threshold value. The fan output duty ratio of the electric control silicone oil fan is adjusted in real time, so that when the electric control silicone oil fan reaches the highest rotating speed, the high-frequency switching of the fan duty ratio among different thresholds is always kept, the silicone oil is ensured to circulate in a critical saturated state, and when the rotating speed required by the fan is reduced, the fan is quickly disconnected, and the disconnection time of the electric control silicone oil fan is greatly reduced.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a method and a system for controlling the disengagement time of an electric control silicone oil fan.
Background
The silicone oil fan clutch (electric control silicone oil clutch fan) uses silicone oil as a medium and utilizes the shearing viscous force of the silicone oil to transfer torque. The rotating speed of the fan is designed in consideration of the condition that the engine is not overheated when the use condition is worst, so that the rotating speed of the fan should be controlled within a proper range during the normal running of the vehicle, so that the noise can be reduced, and the economy of the engine can be improved. For engine-driven fans, a fan clutch is typically used to control the speed thereof.
As shown in fig. 1, the electric control silicone oil clutch fan has the working principle that: fan silicon oil enters the working cavity through the silicon oil port by utilizing centrifugal force generated by high-speed rotation of the driving shaft through an oil storage cavity below the silicon oil port, the engine controller controls the opening of the clutch valve plate to determine the silicon oil amount of the silicon oil port through the duty ratio of the output pulse width modulation signal, and the driving shaft transmits torque through shearing torque generated by the silicon oil to drive the fan on the rear cover to rotate. The silicone oil flows back to the oil storage cavity through the oil return route by relative centrifugal force.
In the prior art, the engine ECU controls the fan only according to the existing feedforward plus closed-loop control method. When the electric control silicon oil clutch fan is in a full meshing state in the using process, if the rotating speed of the fan required by an engine is reduced at the moment, the engine ECU adjusts the duty ratio output value of the fan according to the existing feedforward and closed loop control method, so that the valve plate of the fan clutch is completely closed at the moment, and silicon oil in a supersaturated state of a full working cavity needs to flow back to an oil storage cavity through an oil outlet by utilizing relative centrifugal force.
Referring to fig. 2, when the silicone oil in the supersaturated state filling the working chamber flows back to the oil storage chamber, the time for the excessive silicone oil to flow back to the oil storage chamber through the oil outlet by using the relative centrifugal force is too long, so that the fan is separated for a relatively long time, which is about 30s-60s, and the output power of the engine is high and the oil consumption is relatively high.
Therefore, how to reduce the time for the fan to disengage from the fully engaged state is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of this, the invention provides a method and a system for controlling the disengagement time of an electronic control silicone oil fan, and aims to solve the problem of how to perform full-engagement prevention control on the electronic control silicone oil fan when the electronic control silicone oil fan enters a full-engagement state so as to reduce the disengagement time of the electronic control silicone oil fan.
The invention provides a method and a system for controlling the separation time of an electric control silicone oil fan, which determine the output duty ratio of the fan according to the acquired set rotating speed of the fan and the actual rotating speed of the fan, the actual rotating speed of the electric control silicone oil fan rotates according to the set rotating speed of the fan, the meshing rotating speed of the fan of the electric control silicone oil fan is determined, whether the set rotating speed of the fan is greater than the meshing rotating speed of the fan is judged in real time, the output duty ratio of the fan of the electric control silicone oil fan is adjusted in real time according to the judgment result, so that the output duty ratio of the fan of the electric control silicone oil fan is output according to a first threshold value or a second threshold value, the duty ratio of the fan is adjusted in time when the electric control silicone oil fan is detected to reach the full meshing state in advance, the fan is enabled to be in a non-full meshing state when the maximum rotating speed of the fan is ensured, the minimum silicone oil quantity required by the maximum rotating speed of the fan is maintained, when the rotating speed required by the fan is reduced, the silicone oil which maintains the maximum rotating speed of the silicone oil quantity of the silicone oil quickly flows into an oil storage cavity by using a relative centrifugal force, and the separation time of the fan is shortened.
In some embodiments of the present invention, a method for controlling a disengagement time of an electronically controlled silicone oil fan is provided, which is applied to an electronically controlled silicone oil fan on an engine, and includes:
acquiring a set fan rotating speed and an actual fan rotating speed of an electronic control silicone oil fan, and determining the fan output duty ratio of the electronic control silicone oil fan according to the set fan rotating speed and the actual fan rotating speed so that the actual fan rotating speed rotates according to the set fan rotating speed;
determining the fan meshing rotating speed of the electric control silicone oil fan, judging whether the set rotating speed of the fan is greater than the fan meshing rotating speed in real time, and adjusting the fan output duty ratio of the electric control silicone oil fan in real time according to the judgment result so as to enable the fan output duty ratio of the electric control silicone oil fan to be output according to a first threshold value or a second threshold value, wherein,
the first threshold is greater than the second threshold.
In some embodiments of the present invention, when the fan output duty ratio of the electronic control silicone oil fan is adjusted in real time according to the determination result, it is determined whether the set fan rotation speed is greater than the fan meshing rotation speed:
if not, enabling the electric control silicone oil fan to output according to the current fan output duty ratio;
if so, outputting the fan output duty ratio of the electric control silicone oil fan according to a first threshold value, and continuously judging whether the set rotating speed of the fan is greater than the meshing rotating speed of the fan:
if not, enabling the fan output duty ratio of the electric control silicone oil fan to be output according to the first threshold value;
if so, outputting the fan output duty ratio of the electric control silicone oil fan according to a second threshold value, and continuously judging whether the set rotating speed of the fan is greater than the meshing rotating speed of the fan:
if not, enabling the fan output duty ratio of the electric control silicone oil fan to be output according to the second threshold value;
if so, outputting the fan output duty ratio of the electric control silicone oil fan according to a first threshold value, continuously judging whether the set rotating speed of the fan is greater than the meshing rotating speed of the fan, and repeatedly executing the judging steps.
In some embodiments of the present invention, after the set rotation speed of the fan is determined to be less than or equal to the engaging rotation speed of the fan and the electrically controlled silicone oil fan is output according to the current fan output duty ratio, it is continuously determined whether the set rotation speed of the fan is greater than the engaging rotation speed of the fan, and the fan output duty ratio of the electrically controlled silicone oil fan is adjusted according to the determination result.
In some embodiments of the present invention, when the fan output duty ratio of the electrically controlled silicone oil fan is determined according to the set fan rotation speed and the actual fan rotation speed, a fan feed-forward duty ratio is determined according to the set fan rotation speed, a fan feedback duty ratio is determined according to a rotation speed deviation value between the set fan rotation speed and the actual fan rotation speed, and the fan output duty ratio is determined according to the fan feed-forward duty ratio and the fan feedback duty ratio.
In some embodiments of the present invention, in determining the fan engagement speed of the electrically controlled silicone oil fan, the fan engagement speed is determined according to the following equation:
fan engagement speed = engine speed x fan speed ratio (1-fan slip ratio).
Compared with the prior art, the invention has the beneficial effects that the output duty ratio of the fan of the electric control silicone oil fan is adjusted in real time, so that when the electric control silicone oil fan reaches the highest rotating speed, the high-frequency switching of the duty ratio of the fan between different thresholds is always kept, the silicone oil is ensured to circulate in a critical saturated state (the minimum amount of silicone oil required for maintaining the maximum rotating speed of the fan), and when the rotating speed required by the fan is reduced, the fan is quickly disconnected, and the disconnection time of the electric control silicone oil fan is greatly reduced.
In some embodiments of the present invention, the fan speed is adjusted by detecting that the fan demanded speed exceeds a certain threshold value, and changing the duty ratio of the output pulse width modulation signal to make the fan silicone oil in a critical saturation state (minimum silicone oil amount for maintaining the maximum fan speed), and making the fan clutch in a non-complete engagement state. The fan can quickly respond when the fan is separated, the separation time is shortened, the system is effectively ensured to work in the optimal temperature range all the time, the service life of the system or parts is prolonged, the energy consumption is reduced, the working efficiency is improved, and the noise caused by the fan can be reduced.
In some embodiments of the present invention, a system for controlling a disengagement time of an electronically controlled silicone oil fan is provided, which is applied to an electronically controlled silicone oil fan on an engine, and includes:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a set fan rotating speed and an actual fan rotating speed of an electric control silicone oil fan, and determining the fan output duty ratio of the electric control silicone oil fan according to the set fan rotating speed and the actual fan rotating speed so that the actual fan rotating speed rotates according to the set fan rotating speed;
the processing module is used for determining the fan meshing rotating speed of the electric control silicone oil fan, judging whether the set rotating speed of the fan is greater than the fan meshing rotating speed in real time, and adjusting the fan output duty ratio of the electric control silicone oil fan in real time according to the judgment result so as to enable the fan output duty ratio of the electric control silicone oil fan to be output according to a first threshold value or a second threshold value, wherein,
the first threshold is greater than the second threshold.
In some embodiments of the present invention, the processing module is further configured to determine whether the set rotational speed of the fan is greater than the engaging rotational speed of the fan when the fan output duty ratio of the electronically controlled silicone oil fan is adjusted in real time according to the determination result:
if not, enabling the electric control silicone oil fan to output according to the current fan output duty ratio;
if so, outputting the fan output duty ratio of the electric control silicone oil fan according to a first threshold value, and continuously judging whether the set rotating speed of the fan is greater than the meshing rotating speed of the fan:
if not, enabling the fan output duty ratio of the electric control silicone oil fan to be output according to the first threshold value;
if so, outputting the fan output duty ratio of the electric control silicone oil fan according to a second threshold value, and continuously judging whether the set rotating speed of the fan is greater than the meshing rotating speed of the fan:
if not, enabling the fan output duty ratio of the electric control silicone oil fan to be output according to the second threshold value;
if so, outputting the fan output duty ratio of the electric control silicone oil fan according to a first threshold value, continuously judging whether the set rotating speed of the fan is greater than the meshing rotating speed of the fan, and repeatedly executing the judging steps.
In some embodiments of the present invention, the processing module is further configured to continuously determine whether the set rotation speed of the fan is greater than the meshing rotation speed of the fan after determining that the set rotation speed of the fan is less than or equal to the meshing rotation speed of the fan and the electrically controlled silicone oil fan is output according to the current output duty ratio of the fan, and adjust the output duty ratio of the fan of the electrically controlled silicone oil fan according to the determination result.
In some embodiments of the present invention, the processing module is further configured to, when determining the fan output duty ratio of the electronically-controlled silicone oil fan according to the set fan rotation speed and the actual fan rotation speed, determine a feedforward fan duty ratio according to the set fan rotation speed, determine a feedback fan duty ratio according to a rotation speed deviation value between the set fan rotation speed and the actual fan rotation speed, and determine the output fan duty ratio according to the feedforward fan duty ratio and the feedback fan duty ratio.
In some embodiments of the invention, the processing module is further configured to, when determining the fan engagement speed of the electrically controlled silicone oil fan, determine the fan engagement speed according to:
fan engagement speed = engine speed x fan speed ratio (1-fan slip ratio).
The method and the system for controlling the disengagement time of the electric control silicone oil fan have the same beneficial effects, and are not described again.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is an internal structural view of an electric control silicone oil clutch fan provided in an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a control of a fully engaged state of a conventional fan according to an embodiment of the present invention;
FIG. 3 is a first control logic diagram of the electrically controlled silicone oil clutch fan according to an embodiment of the present invention;
FIG. 4 is a flowchart of a method for controlling a disengagement time of an electrically controlled silicone oil fan according to an embodiment of the present invention
FIG. 5 is a second control logic diagram of the electrically controlled silicone oil clutch fan according to the embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating a fully engaged state control scenario provided by an embodiment of the present invention;
fig. 7 is a functional block diagram of a system for controlling the disengagement time of an electrically controlled silicone oil fan according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 3, in the engine electric control silicone oil clutch fan control, the engine ECU adopts a maximum value algorithm according to the fan required rotation speed corresponding to the vehicle real-time operation parameters (such as engine temperature, air conditioning state, in-cylinder compression brake, hydraulic oil temperature, transmission oil temperature, and the like), and the maximum value is used as a final fan required rotation speed value, namely the fan set rotation speed. The engine ECU obtains a fan duty ratio feedforward value based on the set fan rotating speed and the engine rotating speed, meanwhile, a closed loop value of the fan duty ratio is obtained through proportional, integral and differential control based on the deviation of the set fan rotating speed and the actual fan rotating speed collected by a fan rotating speed sensor, and the sum of the feedforward value and the closed loop value is used as a final output value of the fan duty ratio.
When the engine speed is fixed, if the engine requires the fan speed to rotate at the maximum capacity, the engine ECU uses the existing feedforward and closed loop control method, the duty ratio output of the fan is a threshold value 2, namely the fan clutch valve plate is fully opened, the working cavity is filled with silicon oil, and the silicon oil is in a supersaturated state. The fan is rotated at maximum capacity, which is the fully engaged state of the fan. The fan speed is referred to herein as the meshing speed. The fan is not rigidly connected with the driving shaft, and torque is transmitted through silicon oil shearing force, namely the meshing rotating speed of the fan is as follows: engine speed transmission ratio (1-fan slip ratio).
The fan is in a full meshing state, if the rotating speed of the fan required by the engine is reduced at the moment, the engine ECU changes the duty ratio output of the fan into a threshold value 1 according to the existing feedforward and closed loop control method, namely the valve plate of the fan clutch is completely closed at the moment, and the silicone oil filled in the supersaturated state of the working cavity needs to flow back to the oil storage cavity through the oil outlet by utilizing relative centrifugal force. The excessive silicone oil flows back to the oil storage cavity through the oil outlet by using the relative centrifugal force for too long time, so that the fan is separated for a relatively long time which is about 30-60 s, and the engine is high in output power and relatively high in oil consumption.
Referring to fig. 2, under the control data of the current fan, the duty ratio of the fan in the full-engagement state is fixed at the threshold value 2, and when the required rotation speed of the fan is reduced, the actual rotation speed disengagement time needs about 35s.
The embodiment provides a method for controlling disengagement time of an electric control silicone oil fan, and by adopting the method, when the fan enters a full engagement state, full engagement prevention control is performed, so that the output duty ratio of the fan is output according to a dynamic change value, the fan control is in a full engagement critical state, a fan valve plate is kept vibrating at high frequency, and silicone oil in a working area is in an active critical saturation state (the minimum amount of silicone oil required by the maximum rotating speed of the fan is maintained). If the requirement for the set rotating speed of the fan is reduced, the silicone oil clutch valve plate is closed quickly, critical saturated silicone oil can flow into the oil storage cavity quickly by using a relative centrifugal force, the critical saturated silicone oil can be separated from the rotation of the rear cover fan caused by the shearing force of the silicone oil driven by the driving shaft quickly, and the actual rotating speed of the fan is reduced quickly.
Referring to fig. 4, the present embodiment provides a method for controlling a disengagement time of an electronic control silicone oil fan, which is applied to an electronic control silicone oil fan on an engine, and includes the following steps:
the method comprises the following steps: acquiring a set fan rotating speed and an actual fan rotating speed of the electronic control silicone oil fan, and determining the fan output duty ratio of the electronic control silicone oil fan according to the set fan rotating speed and the actual fan rotating speed so that the actual fan rotating speed rotates according to the set fan rotating speed;
step two: determining the fan meshing rotating speed of the electronic control silicone oil fan, judging whether the set rotating speed of the fan is larger than the fan meshing rotating speed in real time, and adjusting the fan output duty ratio of the electronic control silicone oil fan in real time according to a judgment result so that the fan output duty ratio of the electronic control silicone oil fan is output according to a first threshold value or a second threshold value.
Specifically, the first threshold is greater than the second threshold. It can be understood that, when the electronic control silicone oil fan is in a full-meshing state, if the fan output duty ratio of the electronic control silicone oil fan adopts the first threshold value for output, the rotating speed of the electronic control silicone oil fan is increased, and if the fan output duty ratio of the electronic control silicone oil fan adopts the second threshold value for output, the rotating speed of the electronic control silicone oil fan is decreased. The values of the first threshold and the second threshold can be determined by those skilled in the art according to actual situations. The first threshold value and the second threshold value only need to meet the requirement that the rotating speed can be respectively reduced and increased when the electric control silicone oil fan is in a full meshing state.
It can be seen that, in the embodiment, the output duty ratio of the fan of the electronic control silicone oil fan is adjusted in real time, so that when the electronic control silicone oil fan reaches the highest rotating speed, the duty ratio of the fan is always kept to be switched at high frequency between different thresholds, silicone oil is ensured to circulate in a critical saturation state (the minimum amount of silicone oil required for maintaining the maximum rotating speed of the fan), and when the rotating speed required by the fan is reduced, the fan is quickly disconnected, and the disconnection time of the electronic control silicone oil fan is greatly reduced.
With reference to fig. 5, in the second step, when the fan output duty ratio of the electronic control silicone oil fan is adjusted in real time according to the determination result, it is determined whether the set rotation speed of the fan is greater than the meshing rotation speed of the fan:
if not, enabling the electric control silicone oil fan to output according to the current fan output duty ratio;
if so, outputting the fan output duty ratio of the electric control silicone oil fan according to a first threshold value, and continuously judging whether the set rotating speed of the fan is greater than the meshing rotating speed of the fan:
if not, enabling the fan output duty ratio of the electric control silicone oil fan to be output according to the first threshold value;
if so, outputting the fan output duty ratio of the electric control silicone oil fan according to a second threshold value, and continuously judging whether the set rotating speed of the fan is greater than the meshing rotating speed of the fan:
if not, enabling the fan output duty ratio of the electric control silicone oil fan to be output according to the second threshold value;
if so, outputting the fan output duty ratio of the electric control silicone oil fan according to a first threshold value, continuously judging whether the set rotating speed of the fan is greater than the meshing rotating speed of the fan, and repeatedly executing the judging steps.
Specifically, when the output duty ratio of the fan of the electronic control silicone oil fan is adjusted in real time according to the judgment result and the set rotating speed of the fan is judged to be greater than the meshing rotating speed of the fan, full meshing prevention control is performed on the electronic control silicone oil fan.
Specifically, when the full-meshing prevention control is performed on the electric control silicone oil fan, whether the set rotating speed of the fan is larger than the meshing rotating speed of the fan or not is continuously judged, and the fan output duty ratio of the electric control silicone oil fan is switched between a first threshold value and a second threshold value at a high frequency according to the judgment result.
Referring to fig. 6, in the present embodiment, the duty ratio of the fan in the fully engaged state is frequently switched between the first threshold value and the first threshold value, and when the required rotation speed of the fan decreases, the actual rotation speed disengagement time takes about 15s, so that the disengagement time of the fan can be greatly reduced.
Specifically, the fan required rotation speed is the maximum value of the in-cylinder compression fan set rotation speed, the engine load factor set rotation speed, the engine temperature set rotation speed, the intake air temperature set rotation speed, the air conditioner compressor set rotation speed, and the fan set minimum rotation speed affected by the engine rotation speed in the present logic.
Specifically, when the fan requirement set rotating speed is less than the fan meshing rotating speed, the duty ratio of a pulse width modulation signal is output through fan set rotating speed feedforward and PID control of the deviation of the fan set rotating speed feedforward and the fan actual rotating speed, and the driving capability output to a driving device is adjusted, so that the rotating speed of the fan is adjusted, and the fan actual rotating speed is enabled to rotate along with the fan set rotating speed;
specifically, when the required rotating speed of the fan exceeds the meshing rotating speed of the fan, the duty ratio of the fan is output by a second threshold value to enable the actual rotating speed of the fan to be increased rapidly, when the actual rotating speed of the fan reaches the meshing rotating speed of the fan, the duty ratio of the fan is output by a first threshold value, the actual rotating speed of the fan is reduced, and when the actual rotating speed of the fan is smaller than the meshing rotating speed of the fan, the duty ratio of the fan is output by a second threshold value, so that the duty ratio of the fan is switched between the first threshold value (which is a calibrated value) and the second threshold value (which is a calibrated value), and silicone oil is circulated in a critical saturated state (minimum amount of silicone oil required for maintaining the maximum rotating speed of the fan).
Specifically, when the required rotating speed of the fan is less than the meshing rotating speed of the fan, the silicone oil clutch valve plate is closed quickly, critical saturated silicone oil (the minimum amount of silicone oil required for maintaining the maximum rotating speed of the fan) can flow into the oil storage cavity quickly by using a relative centrifugal force, the critical saturated silicone oil is separated from the rotation of the rear cover fan caused by the shearing force of the silicone oil driven by the driving shaft quickly, and the actual rotating speed of the fan is reduced quickly. The fan control controls the actual rotating speed of the fan to rotate along with the required rotating speed of the fan according to the original control.
It can be seen that when the fan reaches the maximum rotation speed through the control logic, the duty ratio of the fan is always kept to be switched at high frequency between different thresholds, so that the silicone oil is ensured to circulate in a critical saturation state (the minimum amount of silicone oil required for maintaining the maximum rotation speed of the fan), and when the rotation speed required by the fan is reduced, the fan is quickly disconnected.
Specifically, when the fan is monitored to reach a full meshing state in advance, the duty ratio signal of the fan is adjusted in time, when the fan is ensured to reach the highest rotating speed, the fan is in a non-full meshing state, the silicone oil quantity is enabled to maintain the minimum silicone oil quantity required by the maximum rotating speed of the fan, and when the rotating speed required by the fan is reduced, the silicone oil maintaining the maximum rotating speed silicone oil quantity rapidly flows into the oil storage cavity by utilizing the relative centrifugal force, so that the fan disengaging time is shortened.
Specifically, after the set rotating speed of the fan is judged to be less than or equal to the meshing rotating speed of the fan and the electric control silicone oil fan is output according to the current fan output duty ratio, whether the set rotating speed of the fan is greater than the meshing rotating speed of the fan or not is continuously judged, and the fan output duty ratio of the electric control silicone oil fan is adjusted according to a judgment result.
Specifically, when the fan output duty ratio of the electric control silicone oil fan is determined according to the set fan rotating speed and the actual fan rotating speed, the fan feedforward duty ratio is determined according to the set fan rotating speed, the fan feedback duty ratio is determined according to the rotating speed deviation value between the set fan rotating speed and the actual fan rotating speed, and the fan output duty ratio is determined according to the fan feedforward duty ratio and the fan feedback duty ratio.
Specifically, when determining the fan engagement speed of the electrically controlled silicone oil fan, the fan engagement speed is determined according to the following formula:
fan engagement speed = engine speed fan speed ratio (1-fan slip ratio).
It can be seen that in the above embodiment, if the required rotation speed of the fan exceeds a certain threshold, the fan silicone oil is in the critical saturation state (the minimum silicone oil amount for maintaining the maximum rotation speed of the fan) by changing the duty ratio of the output pulse width modulation signal, and the fan clutch is in the incomplete engagement state to adjust the rotation speed of the fan. The fan can quickly respond when the fan is separated, the separation time is shortened, the system is effectively ensured to work in the optimal temperature range all the time, the service life of the system or parts is prolonged, the energy consumption is reduced, the working efficiency is improved, and the noise caused by the fan can be reduced.
Specifically, the method for controlling the disengagement time of the electrically-controlled silicone oil fan in the embodiment is implemented specifically, and the following examples are given:
the engine speed is 1000rpm/min, the fan transmission ratio is 1.3, the theoretical maximum speed of the fan (electric control silicone oil fan) is 1000 × 1.3=1300rpm/min, the actual maximum speed of the fan cannot reach 1300rpm/min according to the physical characteristics of the silicone oil fan, and the theoretical meshing speed of the fan is as follows: 1300 x (1-7%) =1209 rpm/min, in this case, if the actual rotation speed of the fan reaches over 1209rpm/min and is maintained for a period of time, the fan enters the full engagement state, and if the required rotation speed of the fan is reduced, the fan leaves the full engagement state for a longer time.
The method according to the embodiment: if the fan rotating speed demand exceeds the meshing rotating speed, the ECU adjusts the fan output duty ratio to be 0% according to normal feedforward plus PID control, if the actual rotating speed of the fan is detected to reach 1209rpm/min, the ECU immediately adjusts the fan output duty ratio to be 100%, the actual rotating speed of the fan is reduced at the moment, when the actual rotating speed of the fan is lower than the meshing rotating speed, the ECU controls the fan output duty ratio to be 0% according to normal feedforward plus PID, the rotating speed of the fan is increased, when the rotating speed of the fan reaches 1209rpm/min, the ECU immediately adjusts the duty ratio to be 100%, and the steps are repeated in sequence until the demanded rotating speed is reduced.
By adopting the method, the fan can maintain the maximum cooling capacity, and can be quickly separated from the full-meshing state, so that the fuel economy is effectively improved.
In another preferred implementation mode based on the foregoing embodiment, referring to fig. 7, the present embodiment provides a system for controlling a disengagement time of an electronically controlled silicone oil fan, which is applied to an electronically controlled silicone oil fan on an engine, and includes:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a set fan rotating speed and an actual fan rotating speed of an electric control silicone oil fan, and determining the fan output duty ratio of the electric control silicone oil fan according to the set fan rotating speed and the actual fan rotating speed so that the actual fan rotating speed rotates according to the set fan rotating speed;
the processing module is used for determining the fan meshing rotating speed of the electric control silicone oil fan, judging whether the set rotating speed of the fan is greater than the fan meshing rotating speed in real time, and adjusting the fan output duty ratio of the electric control silicone oil fan in real time according to the judgment result so as to enable the fan output duty ratio of the electric control silicone oil fan to be output according to a first threshold value or a second threshold value, wherein,
specifically, the first threshold is greater than the second threshold.
Specifically, the processing module is further configured to determine whether the set fan speed is greater than the fan meshing speed when the fan output duty ratio of the electronically controlled silicone oil fan is adjusted in real time according to the determination result:
if not, enabling the electric control silicone oil fan to output according to the current fan output duty ratio;
if so, outputting the fan output duty ratio of the electric control silicone oil fan according to a first threshold value, and continuously judging whether the set rotating speed of the fan is greater than the meshing rotating speed of the fan:
if not, enabling the fan output duty ratio of the electric control silicone oil fan to be output according to the first threshold value;
if so, outputting the fan output duty ratio of the electric control silicone oil fan according to a second threshold value, and continuously judging whether the set rotating speed of the fan is greater than the meshing rotating speed of the fan:
if not, enabling the fan output duty ratio of the electric control silicone oil fan to be output according to the second threshold value;
if so, outputting the fan output duty ratio of the electric control silicone oil fan according to a first threshold value, continuously judging whether the set rotating speed of the fan is greater than the meshing rotating speed of the fan, and repeatedly executing the judging steps.
Specifically, the processing module is further configured to continuously determine whether the set fan rotation speed is greater than the fan engagement rotation speed after determining that the set fan rotation speed is less than or equal to the fan engagement rotation speed and enabling the electronic control silicone oil fan to output according to the current fan output duty ratio, and adjust the fan output duty ratio of the electronic control silicone oil fan according to a determination result.
Specifically, the processing module is further configured to determine a fan feed-forward duty ratio according to the set fan rotation speed when the fan output duty ratio of the electronic control silicone oil fan is determined according to the set fan rotation speed and the actual fan rotation speed, determine a fan feedback duty ratio according to a rotation speed deviation value between the set fan rotation speed and the actual fan rotation speed, and determine the fan output duty ratio according to the fan feed-forward duty ratio and the fan feedback duty ratio.
Specifically, the processing module is further configured to, when determining the fan engagement rotation speed of the electronically controlled silicone oil fan, determine the fan engagement rotation speed according to the following equation:
fan engagement speed = engine speed x fan speed ratio (1-fan slip ratio).
It can be seen that in the above embodiment, if the required fan speed exceeds a certain threshold, the fan silicone oil is in the critical saturation state (the minimum silicone oil amount for maintaining the maximum fan speed) by changing the duty ratio of the output pulse width modulation signal, and the fan clutch is in the incomplete engagement state to adjust the fan speed. The fan temperature control system can quickly respond when the fan is separated, the separation time is shortened, the system can be effectively ensured to work in the optimal temperature range all the time, the service life of the system or parts is prolonged, the energy consumption is reduced, the working efficiency is improved, and the noise caused by the fan can be reduced.
For those skilled in the art, when the system for controlling the disengagement time of the electronic control silicone oil fan is implemented specifically, the system can be implemented based on the method for controlling the disengagement time of the electronic control silicone oil fan, and the method and the system have the same advantages, and are not described herein again.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (6)
1. A method for controlling the disengagement time of an electric control silicone oil fan is characterized in that the method is applied to the electric control silicone oil fan on an engine and comprises the following steps:
acquiring a set fan rotating speed and an actual fan rotating speed of an electronic control silicone oil fan, and determining the fan output duty ratio of the electronic control silicone oil fan according to the set fan rotating speed and the actual fan rotating speed so that the actual fan rotating speed rotates according to the set fan rotating speed;
determining the fan meshing rotating speed of the electric control silicone oil fan, judging whether the set rotating speed of the fan is greater than the fan meshing rotating speed in real time, and adjusting the fan output duty ratio of the electric control silicone oil fan in real time according to the judgment result so as to enable the fan output duty ratio of the electric control silicone oil fan to be output according to a first threshold value or a second threshold value, wherein,
the first threshold is greater than the second threshold;
when the fan output duty ratio of the electric control silicone oil fan is determined according to the set rotating speed of the fan and the actual rotating speed of the fan, determining a feedforward duty ratio of the fan according to the set rotating speed of the fan, determining a feedback duty ratio of the fan according to a rotating speed deviation value between the set rotating speed of the fan and the actual rotating speed of the fan, and determining the output duty ratio of the fan according to the feedforward duty ratio of the fan and the feedback duty ratio of the fan;
when the fan output duty ratio of the electric control silicone oil fan is adjusted in real time according to the judgment result, whether the set rotating speed of the fan is greater than the meshing rotating speed of the fan is judged:
if not, enabling the electric control silicone oil fan to output according to the current fan output duty ratio;
if so, outputting the fan output duty ratio of the electric control silicone oil fan according to a first threshold value, and continuously judging whether the set rotating speed of the fan is greater than the meshing rotating speed of the fan:
if not, enabling the fan output duty ratio of the electric control silicone oil fan to be output according to the first threshold value;
if so, outputting the fan output duty ratio of the electric control silicone oil fan according to a second threshold value, and continuously judging whether the set rotating speed of the fan is greater than the meshing rotating speed of the fan:
if not, enabling the fan output duty ratio of the electric control silicone oil fan to be output according to the second threshold value;
if so, outputting the fan output duty ratio of the electric control silicone oil fan according to a first threshold value, continuously judging whether the set rotating speed of the fan is greater than the meshing rotating speed of the fan, and repeatedly executing the judging steps.
2. The method for controlling the release time of an electrically controlled silicone oil fan according to claim 1,
and after the set rotating speed of the fan is judged to be less than or equal to the meshing rotating speed of the fan and the electric control silicone oil fan is output according to the current fan output duty ratio, continuously judging whether the set rotating speed of the fan is greater than the meshing rotating speed of the fan or not, and adjusting the fan output duty ratio of the electric control silicone oil fan according to a judgment result.
3. The method for controlling disengagement time of an electrically controlled silicone oil fan according to claim 1, wherein in determining the fan engagement speed of the electrically controlled silicone oil fan, the fan engagement speed is determined according to:
fan engagement speed = engine speed fan speed ratio (1-fan slip ratio).
4. A system for controlling the disengagement time of an electronic control silicone oil fan, which is applied to the electronic control silicone oil fan on an engine, comprises:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a fan set rotating speed and a fan actual rotating speed of an electronic control silicone oil fan, and determining a fan output duty ratio of the electronic control silicone oil fan according to the fan set rotating speed and the fan actual rotating speed so that the actual rotating speed of the electronic control silicone oil fan rotates according to the fan set rotating speed;
the processing module is used for determining the fan meshing rotating speed of the electric control silicone oil fan, judging whether the set rotating speed of the fan is greater than the fan meshing rotating speed in real time, and adjusting the fan output duty ratio of the electric control silicone oil fan in real time according to the judgment result so as to enable the fan output duty ratio of the electric control silicone oil fan to be output according to a first threshold value or a second threshold value, wherein,
the first threshold is greater than the second threshold;
the processing module is further used for determining a fan feedforward duty ratio according to the set rotating speed of the fan, determining a fan feedback duty ratio according to a rotating speed deviation value between the set rotating speed of the fan and the actual rotating speed of the fan, and determining the fan output duty ratio according to the fan feedforward duty ratio and the fan feedback duty ratio when determining the fan output duty ratio of the electric control silicone oil fan according to the set rotating speed of the fan and the actual rotating speed of the fan;
the processing module is further used for judging whether the set rotating speed of the fan is greater than the meshing rotating speed of the fan when the fan output duty ratio of the electric control silicone oil fan is adjusted in real time according to the judgment result:
if not, enabling the electric control silicone oil fan to output according to the current fan output duty ratio;
if so, outputting the fan output duty ratio of the electric control silicone oil fan according to a first threshold value, and continuously judging whether the set rotating speed of the fan is greater than the meshing rotating speed of the fan:
if not, enabling the fan output duty ratio of the electric control silicone oil fan to be output according to the first threshold value;
if so, outputting the fan output duty ratio of the electric control silicone oil fan according to a second threshold value, and continuously judging whether the set rotating speed of the fan is greater than the meshing rotating speed of the fan:
if not, enabling the fan output duty ratio of the electric control silicone oil fan to be output according to the second threshold value;
if so, outputting the fan output duty ratio of the electric control silicone oil fan according to a first threshold value, continuously judging whether the set rotating speed of the fan is greater than the meshing rotating speed of the fan, and repeatedly executing the judging steps.
5. System for controlling the disengagement time of an electrically controlled silicone oil fan according to claim 4,
and the processing module is further used for continuously judging whether the set rotating speed of the fan is greater than the meshing rotating speed of the fan or not after judging that the set rotating speed of the fan is less than or equal to the meshing rotating speed of the fan and enabling the electric control silicone oil fan to output according to the current output duty ratio of the fan, and adjusting the output duty ratio of the fan of the electric control silicone oil fan according to the judgment result.
6. System for controlling the disengagement time of an electronically controlled silicone oil fan according to claim 4,
the processing module is further used for determining the fan meshing rotating speed according to the following formula when determining the fan meshing rotating speed of the electric control silicone oil fan:
fan engagement speed = engine speed x fan speed ratio (1-fan slip ratio).
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