阅读说明：本技术 一种硅油风扇控制方法及装置 (Silicone oil fan control method and device ) 是由 关孟樵 陈曼 谭宪琦 刘勇 于 2021-09-29 设计创作，主要内容包括：本申请涉及一种硅油风扇控制方法及装置,涉及车辆控制技术领域,该方法包括以下步骤：获得硅油风扇的啮合度；当啮合度的数值大于等于第一捏合度阈值时,控制硅油风扇的转速达到预设的第一目标限制转速；当啮合度的数值在第一捏合度阈值与第二啮合度阈值之间时,向硅油风扇对应的控制装置分配用于控制硅油风扇的第一PID值；当啮合度的数值小于第二啮合度阈值时,向硅油风扇对应的控制装置分配用于控制硅油风扇的第二PID值。本申请对硅油风扇的啮合度进行监测,根据不同的啮合度,采取不同的控制策略,使得硅油风扇在保持正常工作的前提下,啮合度处于合适的程度,避免发生完全啮合的情况。(The application relates to a silicone oil fan control method and a silicone oil fan control device, which relate to the technical field of vehicle control, and the method comprises the following steps: obtaining the engagement degree of the silicone oil fan; when the numerical value of the degree of engagement is larger than or equal to a first kneading degree threshold value, controlling the rotating speed of the silicone oil fan to reach a preset first target limit rotating speed; when the numerical value of the meshing degree is between the first kneading degree threshold value and the second meshing degree threshold value, a first PID value for controlling the silicone oil fan is distributed to a control device corresponding to the silicone oil fan; and when the numerical value of the meshing degree is smaller than a second meshing degree threshold value, allocating a second PID value for controlling the silicone oil fan to the control device corresponding to the silicone oil fan. This application monitors the meshing degree of silicon oil fan, according to the meshing degree of difference, takes different control strategy for the silicon oil fan is under the prerequisite that keeps normal work, and the meshing degree is in suitable degree, avoids taking place the condition of meshing completely.)

1. A silicone oil fan control method is characterized by comprising the following steps:

obtaining the engagement degree of the silicone oil fan;

when the numerical value of the engagement degree is larger than or equal to a first kneading degree threshold value, controlling the rotating speed of the silicone oil fan to reach a preset first target limit rotating speed;

when the numerical value of the meshing degree is between the first kneading degree threshold value and a second meshing degree threshold value, a first PID value used for controlling the silicone oil fan is distributed to a control device corresponding to the silicone oil fan;

when the numerical value of the meshing degree is smaller than a second meshing degree threshold value, distributing a second PID value for controlling the silicone oil fan to a control device corresponding to the silicone oil fan; wherein the content of the first and second substances,

the first kneading degree threshold value is greater than the second meshing degree threshold value;

the first PID value is greater than the second PID value.

2. The silicone oil fan control method according to claim 1, wherein when the value of the degree of engagement is equal to or greater than a first kneading degree threshold value, the method further comprises the steps of:

and controlling the silicone oil fan to be incapable of being completely meshed based on a PWM control technology.

3. The silicone oil fan control method according to claim 2, wherein the controlling that the silicone oil fan cannot be completely engaged based on the PWM control technique comprises the steps of:

and controlling the silicone oil fan to be in a complete disengagement state based on a PWM control technology until the value of the degree of rodents of the silicone oil fan is smaller than the first kneading degree threshold value.

4. The silicone oil fan control method according to claim 1, wherein the obtaining of the degree of engagement of the silicone oil fan includes the steps of:

identifying the engine rotating speed of the vehicle corresponding to the silicone oil fan and the corresponding rotating speed ratio;

calculating and obtaining a driving rotating speed corresponding to the silicone oil fan based on the rotating speed of the engine and the rotating speed ratio;

and calculating to obtain the engagement degree of the silicone oil fan based on the driving rotating speed and the fan target rotating speed of the silicone oil fan.

5. The silicone oil fan control method according to claim 1, further comprising a parameter setting process, the parameter setting process including the steps of:

adjusting the rotating speed of the silicone oil fan based on a preset first working temperature;

selecting the meshing degree corresponding to the slip ratio of the silicone oil fan and a preset first slip ratio as the first kneading degree threshold value;

and selecting the meshing degree of the silicone oil fan in a stable state as a second meshing degree threshold value.

6. The silicone oil fan control method according to claim 1, characterized in that:

the first kneading degree threshold value is 95%;

the second engagement threshold is 80%.

7. A silicone oil fan control apparatus, the apparatus comprising:

a kneading degree obtaining module for obtaining a degree of meshing of the silicone oil fan;

the first control module is used for controlling the rotating speed of the silicone oil fan to reach a preset first target limit rotating speed when the numerical value of the engagement degree is larger than or equal to a first kneading degree threshold value;

the control distribution module is used for distributing a first PID value for controlling the silicone oil fan to a corresponding control device of the silicone oil fan when the numerical value of the engagement degree is between the first kneading degree threshold value and a second engagement degree threshold value;

the control distribution module is further used for distributing a second PID value for controlling the silicone oil fan to the control device corresponding to the silicone oil fan when the numerical value of the engagement degree is smaller than a second engagement degree threshold value; wherein the content of the first and second substances,

the first kneading degree threshold value is greater than the second meshing degree threshold value;

the first PID value is greater than the second PID value.

8. The silicone oil fan control device according to claim 7, characterized in that:

the first control module is also used for controlling the silicone oil fan to be in a complete disengagement state based on a PWM control technology until the value of the degree of rodents of the silicone oil fan is smaller than the first kneading degree threshold value.

9. The silicone oil fan control device according to claim 7, characterized in that:

the kneading degree acquisition module is also used for identifying the engine rotating speed of the vehicle corresponding to the silicone oil fan and the corresponding rotating speed ratio;

the kneading degree obtaining module is also used for calculating and obtaining the driving rotating speed corresponding to the silicone oil fan based on the rotating speed of the engine and the rotating speed ratio;

the kneading degree obtaining module is also used for calculating and obtaining the meshing degree of the silicone oil fan based on the driving rotating speed and the fan target rotating speed of the silicone oil fan.

10. The silicone oil fan control device of claim 7, further comprising:

the parameter setting module is used for adjusting the rotating speed of the silicone oil fan based on a preset first working temperature;

the parameter setting module is further used for selecting the meshing degree of the slip ratio of the silicone oil fan and the preset first slip ratio as the first kneading degree threshold value;

the parameter setting module is also used for selecting the meshing degree of the silicone oil fan in a stable state as a second meshing degree threshold value.

Technical Field

The application relates to the technical field of vehicle control, in particular to a silicone oil fan control method and device.

Background

The existing silicone oil fan clutch uses silicone oil as a medium and utilizes the shearing viscous force of the silicone oil to transfer torque. The space between the front cover and the driven plate of the fan clutch is an oil storage cavity for storing high-viscosity silicone oil. During use, high viscosity silicone oil, due to its nature, results in a fan that is fully engaged when the fan is fully engaged due to the effects of air pressure and silicone oil viscosity. Once the fan is fully engaged, the disengagement time is longer and higher engine speeds are required, thus increasing engine load and increasing overall vehicle fuel consumption.

In order to solve the technical problems, a silicone oil fan control is provided to prevent the silicone oil fan from being in a complete meshing state.

Disclosure of Invention

The application provides a silicone oil fan control method and device, monitors the meshing degree of the silicone oil fan, and adopts different control strategies according to different meshing degrees, so that the meshing degree is in a proper degree on the premise of keeping normal work of the silicone oil fan, and the occurrence of complete meshing is avoided.

In a first aspect, the present application provides a silicone oil fan control method, including:

obtaining the engagement degree of the silicone oil fan;

when the numerical value of the engagement degree is larger than or equal to a first kneading degree threshold value, controlling the rotating speed of the silicone oil fan to reach a preset first target limit rotating speed;

when the numerical value of the meshing degree is between the first kneading degree threshold value and a second meshing degree threshold value, a first PID value used for controlling the silicone oil fan is distributed to a control device corresponding to the silicone oil fan;

when the numerical value of the meshing degree is smaller than a second meshing degree threshold value, distributing a second PID value for controlling the silicone oil fan to a control device corresponding to the silicone oil fan; wherein the content of the first and second substances,

the first kneading degree threshold value is greater than the second meshing degree threshold value;

the first PID value is greater than the second PID value.

According to the technical scheme, the meshing degree of the silicone oil fan is monitored, different control strategies are adopted according to different meshing degrees, the silicone oil fan keeps working normally, the meshing degree is in a proper degree, and the situation of complete meshing is avoided.

Based on the core technical idea of the technical scheme of the application, an operation flow in specific implementation is provided:

firstly, controlling a silicone oil fan according to a control requirement, and monitoring to obtain the engagement degree of the silicone oil fan;

secondly, when the meshing degree of the silicone oil fan is larger than or equal to a first kneading degree threshold value, namely the meshing degree A of the silicone oil fan is larger than or equal to 95%, the ON/OFF control of the silicone oil fan is carried out by using a PWM control technology through a control device corresponding to the silicone oil fan, so that the silicone oil fan cannot be completely meshed, and the separation time of the silicone oil fan is greatly reduced;

thirdly, when the numerical value of the meshing degree is between the first meshing degree threshold value and the second meshing degree threshold value, namely the meshing degree of the silicone oil fan is more than or equal to 80% and less than or equal to A and less than 95%, distributing a first PID value for controlling the silicone oil fan to a control device corresponding to the silicone oil fan, and realizing the control of the silicone oil fan;

and fourthly, when the numerical value of the meshing degree is smaller than a second meshing degree threshold value, namely the meshing degree A of the silicone oil fan is smaller than 80%, distributing a second PID value for controlling the silicone oil fan to a control device corresponding to the silicone oil fan, and controlling the silicone oil fan.

To sum up, the technical scheme in the application mainly controls the following three conditions, and the specific operation conditions are as follows:

the first condition is as follows: when the meshing degree of the silicone oil fan is greater than or equal to a first kneading degree threshold value, namely the meshing degree A of the silicone oil fan is greater than or equal to 95%, the PWM control technology is used for carrying out ON/OFF control ON the silicone oil fan, the rotating speed of the silicone oil fan is controlled, the silicone oil fan cannot be completely meshed, and therefore the separation time of the silicone oil fan is greatly reduced;

case two: when the numerical value of the meshing degree is between the first meshing degree threshold value and the second meshing degree threshold value, namely the meshing degree of the silicone oil fan is more than or equal to 80% and A is less than 95%, controlling the silicone oil fan by using a larger PID value, and controlling the rotating speed of the silicone oil fan;

case three: and when the numerical value of the meshing degree is smaller than a second meshing degree threshold value, namely the meshing degree A of the silicone oil fan is less than 80%, controlling the silicone oil fan by using a smaller PID value to control the rotating speed of the silicone oil fan.

Further, when the value of the degree of engagement is equal to or greater than a first kneading degree threshold value, the silicone oil fan control method further includes the steps of:

and controlling the silicone oil fan to be incapable of being completely meshed based on a PWM control technology.

Specifically, in the silicone oil fan control method, the silicone oil fan is controlled not to be completely engaged based on the PWM control technique, which includes the steps of:

and controlling the silicone oil fan to be in a complete disengagement state based on a PWM control technology until the value of the degree of rodents of the silicone oil fan is smaller than the first kneading degree threshold value.

Specifically, the method for controlling the silicone oil fan to obtain the engagement degree of the silicone oil fan comprises the following steps:

identifying the engine rotating speed of the vehicle corresponding to the silicone oil fan and the corresponding rotating speed ratio;

calculating and obtaining a driving rotating speed corresponding to the silicone oil fan based on the rotating speed of the engine and the rotating speed ratio;

and calculating to obtain the engagement degree of the silicone oil fan based on the driving rotating speed and the fan target rotating speed of the silicone oil fan.

Further, the silicone oil fan control method further comprises a parameter setting process, wherein the parameter setting process comprises the following steps:

adjusting the rotating speed of the silicone oil fan based on a preset first working temperature;

selecting the meshing degree corresponding to the slip ratio of the silicone oil fan and a preset first slip ratio as the first kneading degree threshold value;

and selecting the meshing degree of the silicone oil fan in a stable state as a second meshing degree threshold value.

Specifically, the first kneading degree threshold value is 95%;

the second engagement threshold is 80%.

It should be noted that, during actual operation, the silicone oil fan clutch can automatically adjust the rotation speed of the silicone oil fan according to the requirement of controlling temperature, so that the engine works at the optimal working temperature, and the performance of the silicone oil fan clutch is measured by slip and heat dissipation;

wherein, the slip ratio is generally required to be in the range of 3-7%, according to the performance index, the meshing degree of the silicone oil fan is in the range of 93-97%, and the middle value of 95% meshing degree is selected as the high meshing degree of the fan, namely the boundary value of the first section, namely the first kneading degree threshold value;

when the engagement degree of the fan reaches 80%, the rotation speed of the silicone oil fan is judged to start to enter a stable period, so that 80% is selected as a boundary value of the second section, namely a second kneading degree threshold value.

In a second aspect, the present application provides a silicone oil fan control apparatus, the apparatus comprising:

a kneading degree obtaining module for obtaining a degree of meshing of the silicone oil fan;

the first control module is used for controlling the rotating speed of the silicone oil fan to reach a preset first target limit rotating speed when the numerical value of the engagement degree is larger than or equal to a first kneading degree threshold value;

the control distribution module is used for distributing a first PID value for controlling the silicone oil fan to a corresponding control device of the silicone oil fan when the numerical value of the engagement degree is between the first kneading degree threshold value and a second engagement degree threshold value;

the control distribution module is further used for distributing a second PID value for controlling the silicone oil fan to the control device corresponding to the silicone oil fan when the numerical value of the engagement degree is smaller than a second engagement degree threshold value; wherein the content of the first and second substances,

the first kneading degree threshold value is greater than the second meshing degree threshold value;

the first PID value is greater than the second PID value.

Further, the first control module is also used for controlling the silicone oil fan to be in a complete disengagement state based on a PWM control technology until the value of the degree of rodents of the silicone oil fan is smaller than the first kneading degree threshold value.

Further, the kneading degree obtaining module is also used for identifying the engine rotating speed of the vehicle corresponding to the silicone oil fan and the corresponding rotating speed ratio;

the kneading degree obtaining module is also used for calculating and obtaining the driving rotating speed corresponding to the silicone oil fan based on the rotating speed of the engine and the rotating speed ratio;

the kneading degree obtaining module is also used for calculating and obtaining the meshing degree of the silicone oil fan based on the driving rotating speed and the fan target rotating speed of the silicone oil fan.

Further, the silicone oil fan control device further includes:

the parameter setting module is used for adjusting the rotating speed of the silicone oil fan based on a preset first working temperature;

the parameter setting module is further used for selecting the meshing degree of the slip ratio of the silicone oil fan and the preset first slip ratio as the first kneading degree threshold value;

the parameter setting module is also used for selecting the meshing degree of the silicone oil fan in a stable state as a second meshing degree threshold value.

The beneficial effect that technical scheme that this application provided brought includes:

this application monitors the meshing degree of silicon oil fan, according to the meshing degree of difference, takes different control strategy for the silicon oil fan is under the prerequisite that keeps normal work, and the meshing degree is in suitable degree, avoids taking place the condition of meshing completely.

Drawings

Interpretation of terms:

PID: a contribution Integration Differentiation, proportional integral derivative;

PWM: pulse Width Modulation.

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a flow chart of steps of a silicone oil fan control method provided in an embodiment of the present application;

FIG. 2 is a schematic flow chart of a silicone oil fan control method provided in an embodiment of the present application;

fig. 3 is a diagram illustrating a calculated relationship among an engine speed, a rotation speed ratio, a fan target rotation speed, and a degree of engagement of a silicone oil fan in the silicone oil fan control method provided in the embodiment of the present application;

fig. 4 is a block diagram of a silicone oil fan control device provided in an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

The embodiment of the application provides a silicone oil fan control method and device, the meshing degree of a silicone oil fan is monitored, different control strategies are adopted according to different meshing degrees, so that the meshing degree is in a proper degree on the premise that the silicone oil fan keeps working normally, and the situation of complete meshing is avoided.

In order to achieve the technical effects, the general idea of the application is as follows:

a silicone oil fan control method comprises the following steps:

s1, obtaining the engagement degree of the silicone oil fan;

s2, when the numerical value of the degree of engagement is larger than or equal to the first kneading degree threshold value, controlling the rotating speed of the silicone oil fan to reach a preset first target limit rotating speed;

s3, when the numerical value of the meshing degree is between the first kneading degree threshold value and the second meshing degree threshold value, allocating a first PID value for controlling the silicone oil fan to the control device corresponding to the silicone oil fan;

s4, when the numerical value of the meshing degree is smaller than a second meshing degree threshold value, distributing a second PID value for controlling the silicone oil fan to a control device corresponding to the silicone oil fan; wherein the content of the first and second substances,

the first kneading degree threshold value is larger than the second meshing degree threshold value;

the first PID value is greater than the second PID value.

Embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

In a first aspect, referring to fig. 1 to 3, an embodiment of the present application provides a silicone oil fan control method, including:

s1, obtaining the engagement degree of the silicone oil fan;

s2, when the numerical value of the degree of engagement is larger than or equal to the first kneading degree threshold value, controlling the rotating speed of the silicone oil fan to reach a preset first target limit rotating speed;

s3, when the numerical value of the meshing degree is between the first kneading degree threshold value and the second meshing degree threshold value, allocating a first PID value for controlling the silicone oil fan to the control device corresponding to the silicone oil fan;

s4, when the numerical value of the meshing degree is smaller than a second meshing degree threshold value, distributing a second PID value for controlling the silicone oil fan to a control device corresponding to the silicone oil fan; wherein the content of the first and second substances,

the first kneading degree threshold value is larger than the second meshing degree threshold value;

the first PID value is greater than the second PID value.

It should be noted that, in the field of automobiles at the present stage, the existing silicone oil fan clutch uses silicone oil as a medium, and utilizes the shear adhesion of the silicone oil to transmit torque;

the space between the front cover and the driven plate of the fan clutch is an oil storage cavity for storing high-viscosity silicone oil;

during use, due to the influence of air pressure and viscosity of the silicone oil, the silicone oil with high viscosity can cause the fan to be completely engaged when the fan is completely engaged due to the characteristics of the silicone oil;

once the fan is fully engaged, the disengagement time is longer and higher engine speeds are required, thus increasing engine load and increasing overall vehicle fuel consumption.

Therefore, based on the technical scheme in the embodiment of the application, the meshing degree of the silicone oil fan is monitored, and different control strategies are adopted according to different meshing degrees, so that the meshing degree is in a proper degree on the premise that the silicone oil fan keeps working normally, and the condition of complete meshing is avoided;

in addition, in the embodiment of the application, when the silicone oil fan is controlled, a control scheme of a self-adaptive variable PID parameter is specifically adopted, and different PID parameters are adopted under the requirements of different rotating speeds and ambient temperatures, so that the engagement degree of the silicone oil fan is self-adaptively adjusted, and the silicone oil fan does not enter a full engagement state at a higher rotating speed.

Specifically, the first kneading degree threshold value is 95%;

the second engagement threshold is 80%.

It should be noted that, during actual operation, the silicone oil fan clutch can automatically adjust the rotation speed of the silicone oil fan according to the requirement of controlling temperature, so that the engine works at the optimal working temperature, and the performance of the silicone oil fan clutch is measured by slip and heat dissipation;

wherein, the slip ratio is generally required to be in the range of 3-7%, according to the performance index, the meshing degree of the silicone oil fan is in the range of 93-97%, and the middle value of 95% meshing degree is selected as the high meshing degree of the fan, namely the boundary value of the first section, namely the first kneading degree threshold value;

when the engagement degree of the fan reaches 80%, the rotation speed of the silicone oil fan is judged to start to enter a stable period, so that 80% is selected as a boundary value of the second section, namely a second kneading degree threshold value.

Further, when the value of the degree of engagement is equal to or greater than a first kneading degree threshold value, the silicone oil fan control method further includes the steps of:

and controlling the silicone oil fan to be incapable of being completely meshed based on a PWM control technology.

Specifically, the method for controlling the silicone oil fan to be incapable of being completely engaged based on the PWM control technology includes the following steps:

and controlling the silicone oil fan to be in a complete disengagement state based on a PWM control technology until the value of the degree of rodents of the silicone oil fan is smaller than the first kneading degree threshold value.

It should be noted that, the PWM control method is the most widely used technical means for controlling the rotation speed of the silicone oil fan at present, and converts the PWM wave into a control signal capable of directly driving the silicone oil fan motor, and controls the silicone oil fan to be turned on and off at a specific frequency, and when the engagement degree of the fan is greater than a first engagement degree threshold value, that is, greater than 95%, the PWM is requested to be 0%, that is, the silicone oil fan is controlled to be in a fully disengaged state, until the engagement degree of the silicone oil fan is restored below the first engagement degree threshold value, that is, below 95%.

Specifically, the method for obtaining the engagement degree of the silicone oil fan comprises the following steps:

identifying the engine rotating speed of the vehicle corresponding to the silicone oil fan and the corresponding rotating speed ratio;

calculating and obtaining a driving rotating speed corresponding to the silicone oil fan based on the rotating speed of the engine and the rotating speed ratio;

and calculating to obtain the engagement degree of the silicone oil fan based on the driving rotating speed and the fan target rotating speed of the silicone oil fan.

As shown in fig. 3 of the drawings of the specification, fig. 3 is a graph showing a calculated relationship among the engine speed, the rotation speed ratio, the fan target speed, and the degree of engagement of the silicone oil fan;

the driving rotating speed corresponding to the silicone oil fan is equal to the product of the rotating speed of the engine and the rotating speed ratio corresponding to the silicone oil fan;

the engagement degree of the silicone oil fan is the fan target rotating speed corresponding to the silicone oil fan divided by the driving rotating speed corresponding to the silicone oil fan.

Further, the silicone oil fan control method further comprises a parameter setting process, wherein the parameter setting process comprises the following steps:

adjusting the rotating speed of the silicone oil fan based on a preset first working temperature;

selecting the meshing degree corresponding to the slip ratio of the silicone oil fan and a preset first slip ratio as the first kneading degree threshold value;

and selecting the meshing degree of the silicone oil fan in a stable state as a second meshing degree threshold value.

Based on the core technical idea of the technical scheme of the embodiment of the application, an operation flow in specific implementation is provided:

firstly, controlling a silicone oil fan according to a control requirement, and monitoring to obtain the engagement degree of the silicone oil fan;

secondly, when the meshing degree of the silicone oil fan is larger than or equal to a first kneading degree threshold value, namely the meshing degree A of the silicone oil fan is larger than or equal to 95%, the ON/OFF control of the silicone oil fan is carried out by using a PWM control technology through a control device corresponding to the silicone oil fan, so that the silicone oil fan cannot be completely meshed, and the separation time of the silicone oil fan is greatly reduced;

thirdly, when the numerical value of the meshing degree is between the first meshing degree threshold value and the second meshing degree threshold value, namely the meshing degree of the silicone oil fan is more than or equal to 80% and less than or equal to A and less than 95%, distributing a first PID value for controlling the silicone oil fan to a control device corresponding to the silicone oil fan, and realizing the control of the silicone oil fan;

and fourthly, when the numerical value of the meshing degree is smaller than a second meshing degree threshold value, namely the meshing degree A of the silicone oil fan is smaller than 80%, distributing a second PID value for controlling the silicone oil fan to a control device corresponding to the silicone oil fan, and controlling the silicone oil fan.

As shown in fig. 2 of the specification, fig. 2 is a schematic flow chart of a technical solution of an embodiment of the present application;

to sum up, the technical solution in the embodiment of the present application mainly controls the following three situations, specifically as follows:

the first condition is as follows: when the meshing degree of the silicone oil fan is greater than or equal to a first kneading degree threshold value, namely the meshing degree A of the silicone oil fan is greater than or equal to 95%, the PWM control technology is used for carrying out ON/OFF control ON the silicone oil fan, the rotating speed of the silicone oil fan is controlled, the silicone oil fan cannot be completely meshed, and therefore the separation time of the silicone oil fan is greatly reduced;

case two: when the numerical value of the meshing degree is between the first meshing degree threshold value and the second meshing degree threshold value, namely the meshing degree of the silicone oil fan is more than or equal to 80% and A is less than 95%, controlling the silicone oil fan by using a larger PID value, and controlling the rotating speed of the silicone oil fan;

case three: and when the numerical value of the meshing degree is smaller than a second meshing degree threshold value, namely the meshing degree A of the silicone oil fan is less than 80%, controlling the silicone oil fan by using a smaller PID value to control the rotating speed of the silicone oil fan.

In a second aspect, referring to fig. 4, an embodiment of the present application provides a silicone oil fan control device for executing the silicone oil fan control method mentioned based on the first aspect, where the device includes:

a kneading degree obtaining module for obtaining a degree of meshing of the silicone oil fan;

the first control module is used for controlling the rotating speed of the silicone oil fan to reach a preset first target limit rotating speed when the numerical value of the engagement degree is larger than or equal to a first kneading degree threshold value;

the control distribution module is used for distributing a first PID value for controlling the silicone oil fan to a corresponding control device of the silicone oil fan when the numerical value of the engagement degree is between the first kneading degree threshold value and a second engagement degree threshold value;

the control distribution module is further used for distributing a second PID value for controlling the silicone oil fan to the control device corresponding to the silicone oil fan when the numerical value of the engagement degree is smaller than a second engagement degree threshold value; wherein the content of the first and second substances,

the first kneading degree threshold value is greater than the second meshing degree threshold value;

the first PID value is greater than the second PID value.

It should be noted that, in the field of automobiles at the present stage, the existing silicone oil fan clutch uses silicone oil as a medium, and utilizes the shear adhesion of the silicone oil to transmit torque;

the space between the front cover and the driven plate of the fan clutch is an oil storage cavity for storing high-viscosity silicone oil;

during use, due to the influence of air pressure and viscosity of the silicone oil, the silicone oil with high viscosity can cause the fan to be completely engaged when the fan is completely engaged due to the characteristics of the silicone oil;

once the fan is fully engaged, the disengagement time is longer and higher engine speeds are required, thus increasing engine load and increasing overall vehicle fuel consumption.

Therefore, based on the technical scheme in the embodiment of the application, the meshing degree of the silicone oil fan is monitored, and different control strategies are adopted according to different meshing degrees, so that the meshing degree is in a proper degree on the premise that the silicone oil fan keeps working normally, and the condition of complete meshing is avoided;

in addition, in the embodiment of the application, when the silicone oil fan is controlled, a control scheme of a self-adaptive variable PID parameter is specifically adopted, and different PID parameters are adopted under the requirements of different rotating speeds and ambient temperatures, so that the engagement degree of the silicone oil fan is self-adaptively adjusted, and the silicone oil fan does not enter a full engagement state at a higher rotating speed.

Specifically, the first kneading degree threshold value is 95%;

the second engagement threshold is 80%.

It should be noted that, during actual operation, the silicone oil fan clutch can automatically adjust the rotation speed of the silicone oil fan according to the requirement of controlling temperature, so that the engine works at the optimal working temperature, and the performance of the silicone oil fan clutch is measured by slip and heat dissipation;

wherein, the slip ratio is generally required to be in the range of 3-7%, according to the performance index, the meshing degree of the silicone oil fan is in the range of 93-97%, and the middle value of 95% meshing degree is selected as the high meshing degree of the fan, namely the boundary value of the first section, namely the first kneading degree threshold value;

when the engagement degree of the fan reaches 80%, the rotation speed of the silicone oil fan is judged to start to enter a stable period, so that 80% is selected as a boundary value of the second section, namely a second kneading degree threshold value.

Further, the first control module is also used for controlling the silicone oil fan to be in a complete disengagement state based on a PWM control technology until the value of the degree of rodents of the silicone oil fan is smaller than the first kneading degree threshold value.

It should be noted that, the PWM control method is the most widely used technical means for controlling the rotation speed of the silicone oil fan at present, and converts the PWM wave into a control signal capable of directly driving the silicone oil fan motor, and controls the silicone oil fan to be turned on and off at a specific frequency, and when the engagement degree of the fan is greater than a first engagement degree threshold value, that is, greater than 95%, the PWM is requested to be 0%, that is, the silicone oil fan is controlled to be in a fully disengaged state, until the engagement degree of the silicone oil fan is restored below the first engagement degree threshold value, that is, below 95%.

Further, the kneading degree obtaining module is also used for identifying the engine rotating speed of the vehicle corresponding to the silicone oil fan and the corresponding rotating speed ratio;

the kneading degree obtaining module is also used for calculating and obtaining the driving rotating speed corresponding to the silicone oil fan based on the rotating speed of the engine and the rotating speed ratio;

the kneading degree obtaining module is also used for calculating and obtaining the meshing degree of the silicone oil fan based on the driving rotating speed and the fan target rotating speed of the silicone oil fan.

It should be noted that the driving rotation speed corresponding to the silicone oil fan is equal to the product of the engine rotation speed and the rotation speed ratio corresponding to the silicone oil fan;

the engagement degree of the silicone oil fan is the fan target rotating speed corresponding to the silicone oil fan divided by the driving rotating speed corresponding to the silicone oil fan.

Further, the apparatus further comprises:

the parameter setting module is used for adjusting the rotating speed of the silicone oil fan based on a preset first working temperature;

the parameter setting module is further used for selecting the meshing degree of the slip ratio of the silicone oil fan and the preset first slip ratio as the first kneading degree threshold value;

the parameter setting module is also used for selecting the meshing degree of the silicone oil fan in a stable state as a second meshing degree threshold value.

Based on the core technical idea of the technical scheme of the embodiment of the application, an operation flow in specific implementation is provided:

firstly, controlling a silicone oil fan according to a control requirement, and monitoring to obtain the engagement degree of the silicone oil fan;

secondly, when the meshing degree of the silicone oil fan is larger than or equal to a first kneading degree threshold value, namely the meshing degree A of the silicone oil fan is larger than or equal to 95%, the ON/OFF control of the silicone oil fan is carried out by using a PWM control technology through a control device corresponding to the silicone oil fan, so that the silicone oil fan cannot be completely meshed, and the separation time of the silicone oil fan is greatly reduced;

thirdly, when the numerical value of the meshing degree is between the first meshing degree threshold value and the second meshing degree threshold value, namely the meshing degree of the silicone oil fan is more than or equal to 80% and less than or equal to A and less than 95%, distributing a first PID value for controlling the silicone oil fan to a control device corresponding to the silicone oil fan, and realizing the control of the silicone oil fan;

and fourthly, when the numerical value of the meshing degree is smaller than a second meshing degree threshold value, namely the meshing degree A of the silicone oil fan is smaller than 80%, distributing a second PID value for controlling the silicone oil fan to a control device corresponding to the silicone oil fan, and controlling the silicone oil fan.

To sum up, the technical solution in the embodiment of the present application mainly controls the following three situations, specifically as follows:

the first condition is as follows: when the meshing degree of the silicone oil fan is greater than or equal to a first kneading degree threshold value, namely the meshing degree A of the silicone oil fan is greater than or equal to 95%, the PWM control technology is used for carrying out ON/OFF control ON the silicone oil fan, the rotating speed of the silicone oil fan is controlled, the silicone oil fan cannot be completely meshed, and therefore the separation time of the silicone oil fan is greatly reduced;

case two: when the numerical value of the meshing degree is between the first meshing degree threshold value and the second meshing degree threshold value, namely the meshing degree of the silicone oil fan is more than or equal to 80% and A is less than 95%, controlling the silicone oil fan by using a larger PID value, and controlling the rotating speed of the silicone oil fan;

case three: and when the numerical value of the meshing degree is smaller than a second meshing degree threshold value, namely the meshing degree A of the silicone oil fan is less than 80%, controlling the silicone oil fan by using a smaller PID value to control the rotating speed of the silicone oil fan.

It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present application and are presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.