CN114683839A - Wet clutch starting control method and system based on driver intention - Google Patents

Wet clutch starting control method and system based on driver intention Download PDF

Info

Publication number
CN114683839A
CN114683839A CN202210210150.XA CN202210210150A CN114683839A CN 114683839 A CN114683839 A CN 114683839A CN 202210210150 A CN202210210150 A CN 202210210150A CN 114683839 A CN114683839 A CN 114683839A
Authority
CN
China
Prior art keywords
clutch
torque
driver
engine
intention
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210210150.XA
Other languages
Chinese (zh)
Inventor
韦永恒
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lianlu Intelligent Transportation Technology Shanghai Co ltd
Original Assignee
Lianlu Intelligent Transportation Technology Shanghai Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lianlu Intelligent Transportation Technology Shanghai Co ltd filed Critical Lianlu Intelligent Transportation Technology Shanghai Co ltd
Priority to CN202210210150.XA priority Critical patent/CN114683839A/en
Publication of CN114683839A publication Critical patent/CN114683839A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K23/00—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for
    • B60K23/02—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for for main transmission clutches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/02—Conjoint control of vehicle sub-units of different type or different function including control of driveline clutches
    • B60W10/023—Fluid clutches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
    • 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
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/04—Smoothing ratio shift
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/06—Combustion engines, Gas turbines
    • B60W2510/0604—Throttle position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/06—Combustion engines, Gas turbines
    • B60W2510/0638—Engine speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2540/00—Input parameters relating to occupants
    • B60W2540/10—Accelerator pedal position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/02—Clutches
    • B60W2710/021—Clutch engagement state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/02—Clutches
    • B60W2710/027—Clutch torque
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/06—Combustion engines, Gas turbines
    • 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
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H2061/0075—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by a particular control method
    • F16H2061/0081—Fuzzy logic

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Mathematical Physics (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)

Abstract

The invention provides a wet clutch starting control method and a system based on driver intention, which comprises the following steps: step 1: identifying the operation intention of the driver according to the opening degree and the change rate of the accelerator pedal; step 2: combining the obtained operation intention of the driver with the rotation speed difference of the driving disc and the driven disc of the wet clutch to deduce the combination or separation oil pressure of the wet clutch; and step 3: and controlling the torque transmission of the clutch in the starting process of the vehicle according to the combination or separation oil pressure of different speed values to drive the vehicle to start. According to the invention, the combination or separation oil pressure of the wet clutch is adaptively output by combining the state variable of the clutch according to the operation intention of a driver, the combination/separation time of the clutch is changed, the sliding wear of the clutch and the vehicle starting time are shortened, the starting impact is reduced, and the vehicle starting quality and the comfort of drivers and passengers are improved.

Description

Wet clutch starting control method and system based on driver intention
Technical Field
The invention relates to the technical field of vehicle control, in particular to a wet clutch starting control method and system based on driver intention.
Background
In the process of starting the vehicle, the torque of the engine is higher than the idle speed of the engine, so the speed of the engine needs to be controlled to a higher point, and the speed can be stabilized to wait for the increase of the speed of the output shaft of the clutch. At this time, any fluctuation of the engine rotation speed brings about fluctuation of the engine torque and fluctuation of the entire vehicle torque, which brings about uncomfortable feeling to the driver and misleading the driver due to the fluctuation of the rotation speed, or brings about a problem of impact of torque transmission due to poor control.
Patent document CN112208330A (application number: CN202011019358.0) discloses a start control method and device for a wet double clutch, an electronic device, and a vehicle. The starting control method of the wet double clutch is based on the position of an accelerator pedal, the change rate of the position of the accelerator pedal and starting gradient information, the starting control method is used for mapping the starting control method to a fuzzy domain in a quantized mode, and the oil pressure increment of a piston cylinder is output by using a fuzzy control rule table, so that the oil pressure in a piston cavity of the wet double clutch is controlled through the intention of a driver and the gradient information, and the purpose of stably starting the wet double clutch at different gradients is achieved by controlling the starting combination speed of the clutch.
In the starting process of the vehicle, the clutch control problem has the characteristics of nonlinearity, time-varying property, strong coupling and the like, and the intention of a driver, the vehicle condition and the road condition are changeable. At present, starting fuzzy control cannot meet the starting requirements of vehicles in different driving environments.
Disclosure of Invention
In view of the shortcomings in the prior art, it is an object of the present invention to provide a wet clutch launch control method and system based on driver intent.
The invention provides a wet clutch starting control method based on driver intention, which comprises the following steps:
step 1: identifying the operation intention of the driver together according to the opening degree and the change rate of the accelerator pedal;
step 2: combining the obtained operation intention of the driver with the rotation speed difference of the driving disc and the driven disc of the wet clutch to deduce the combination or separation oil pressure of the wet clutch;
and 3, step 3: and controlling the torque transmission of the clutch in the starting process of the vehicle according to the combination or separation oil pressure of different speed values to drive the vehicle to start.
Preferably, the opening degree and the change rate of the accelerator pedal are used as the input of the driver starting intention fuzzy controller, the output is the driver operation intention, and the driver starting intention is corresponding to different vehicle starting torque requirements through the opening degree and the change rate of the accelerator pedal;
and formulating a fuzzy control rule according to the fuzzy subset membership function of the input and output variables of the driver starting intention fuzzy controller to obtain a driver starting intention fuzzy control curved surface.
Preferably, a double-layer fuzzy control strategy is adopted according to a starting intention and a starting working condition, and in the wet clutch oil pressure controller, the operation intention of a driver, the engine rotating speed and the difference between the rotating speeds of a main engine and a secondary engine of the clutch are used as input, and the output is the clutch combination or separation oil pressure;
and formulating a fuzzy control rule according to fuzzy subset membership functions of input and output variables of the wet clutch oil pressure controller to obtain a combined oil pressure change rate fuzzy control curved surface.
Preferably, the wet clutch launch process comprises:
stage 1: preparing for starting, wherein the torque of the engine and the torque transmitted by the clutch are zero; the clutch is in a separation state, and the engine is in an idling state; the vehicle is in a static state, and the output rotating speed is zero;
and (2) stage: the engine speed is increased, the torque is gradually increased, the clutch is still in a separation state, the transmission torque of the clutch is zero, and the transmission torque of the engine is used for overcoming the resistance torque of the whole vehicle and eliminating the idle stroke of the clutch;
and (3) stage: the torque of the engine is kept constant, and the rotating speed is stably increased;
and (4) stage: the oil pressure of the clutch continues to rise, the transmission torque of the clutch is increased, the rotating speed of the engine is increased, the starting resistance of the vehicle is increased at the stage, the torque of the clutch is adjusted to the level of the torque of the engine at the end of the stage, the rotating speed of the engine begins to increase, and the oil pressure of the clutch is adjusted to control the transmitted torque, so that the combination speed of the clutch is controlled;
and (5) stage: the clutch torque and the engine torque are equal, so the engine speed begins to remain stable;
and 6: at the beginning of this phase, the engine speed is synchronized with the clutch speed and the clutch is engaged, resulting in a reduction in the torque transmitted by the clutch, due to the increase in the moment of inertia, and then remaining unchanged.
Preferably, the wet clutch realizes torque transmission by controlling oil pressure and the change rate thereof, and is divided into locking, sliding and separating according to the working state of the friction plates of the driving and driven discs, the transmitted torque respectively corresponds to static friction torque, sliding friction torque and no torque, and the functional relational expression is as follows:
Figure BDA0003530670230000021
when the clutch is worn, the transmission torque is determined by the oil pressure, and the rotating speed difference between the driving disc and the driven disc of the clutch is as follows:
Δωec＝ωe-ωc
when the clutch is worn or locked, the transmission torque T of the driving friction plate and the driven friction plate of the clutch under different conditionscExpressed as:
Figure BDA0003530670230000031
in the formula: mu is the friction factor, including the static friction factor mu at lock-upsAnd dynamic friction factor mu in slidingc；PnPositive pressure on the clutch friction plate; s is the action area on the friction plate of the clutch; z is the number of friction pairs; r is1And r2The outer diameter and the inner diameter of the friction plate are respectively; sgn () is a sign function; omegaeIs the engine speed; omegacThe clutch driven plate rotational speed.
According to the present invention, there is provided a wet clutch start control system based on driver's intention, comprising:
module M1: identifying the operation intention of the driver according to the opening degree and the change rate of the accelerator pedal;
module M2: combining the obtained operation intention of the driver with the rotation speed difference of the driving disc and the driven disc of the wet clutch to deduce the combination or separation oil pressure of the wet clutch;
module M3: and controlling the torque transmission of the clutch in the starting process of the vehicle according to the combination or separation oil pressure of different speed values to drive the vehicle to start.
Preferably, the opening degree and the change rate of the accelerator pedal are used as the input of the driver starting intention fuzzy controller, the output is the driver operation intention, and the driver starting intention is corresponding to different vehicle starting torque requirements through the opening degree and the change rate of the accelerator pedal;
and formulating a fuzzy control rule according to the fuzzy subset membership function of the input and output variables of the driver starting intention fuzzy controller to obtain a driver starting intention fuzzy control curved surface.
Preferably, according to a starting intention and a starting working condition, a double-layer fuzzy control strategy is adopted, in a wet clutch oil pressure controller, a driver operation intention, an engine rotating speed and a clutch master-slave engine rotating speed difference are used as input, and output is clutch combination or separation oil pressure;
and formulating a fuzzy control rule according to fuzzy subset membership functions of input and output variables of the wet clutch oil pressure controller to obtain a combined oil pressure change rate fuzzy control curved surface.
Preferably, the wet clutch launch process includes:
stage 1: preparing for starting, wherein the torque of the engine and the torque transmitted by the clutch are zero; the clutch is in a separation state, and the engine is in an idling state; the vehicle is in a static state, and the output rotating speed is zero;
and (2) stage: the engine speed is increased, the torque is gradually increased, the clutch is still in a separation state, the transmission torque of the clutch is zero, and the transmission torque of the engine is used for overcoming the resistance torque of the whole vehicle and eliminating the idle stroke of the clutch;
and (3) stage: the torque of the engine is kept constant, and the rotating speed is stably increased;
and (4) stage: the oil pressure of the clutch continues to rise, the transmission torque of the clutch is increased, the rotating speed of the engine is increased, the starting resistance of the vehicle is increased at the stage, the torque of the clutch is adjusted to the level of the torque of the engine at the end of the stage, the rotating speed of the engine begins to increase, and the oil pressure of the clutch is adjusted to control the transmitted torque, so that the combination speed of the clutch is controlled;
and (5) stage: the clutch torque and the engine torque are equal, so the engine speed begins to remain stable;
and 6: at the beginning of this phase, the engine speed is synchronized with the clutch speed and the clutch is engaged, resulting in a reduction in the torque transmitted by the clutch, due to the increase in the moment of inertia, and then remaining unchanged.
Preferably, the wet clutch realizes torque transmission by controlling oil pressure and the change rate thereof, and is divided into locking, sliding and separating according to the working state of the friction plates of the driving and driven discs, the transmitted torque respectively corresponds to static friction torque, sliding friction torque and no torque, and the functional relational expression is as follows:
Figure BDA0003530670230000041
when the clutch is worn, the transmission torque is determined by the oil pressure, and the rotating speed difference between the driving disc and the driven disc of the clutch is as follows:
Δωec＝ωe-ωc
when the clutch is worn or locked, the transmission torque T of the driving friction plate and the driven friction plate of the clutch under different conditionscExpressed as:
Figure BDA0003530670230000042
in the formula: mu is the friction factor, including the static friction factor mu at lock-upsAnd dynamic friction factor mu in slidingc；PnPositive pressure on the clutch friction plate; s is the action area on the friction plate of the clutch; z is the number of friction pairs; r is1And r2The outer diameter and the inner diameter of the friction plate are respectively; sgn () is a sign function; omegaeIs the engine speed; omegacIs a clutch slaveRotating speed of the movable disc.
Compared with the prior art, the invention has the following beneficial effects:
the invention can adaptively output the combination or separation oil pressure of the wet clutch by combining the state variable of the clutch according to the operation intention of a driver, change the combination/separation time of the clutch, shorten the time for sliding friction of the clutch and starting of the vehicle, reduce the starting impact degree and improve the starting quality of the vehicle and the comfort of drivers and passengers.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic diagram of a vehicle launch process control logic;
FIG. 2 is a driver starting intention recognition fuzzy control curved surface;
FIG. 3 is a fuzzy control curve of the wet clutch engagement oil pressure change rate;
fig. 4 is a breakaway torque/speed analysis diagram.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the invention.
Example (b):
as shown in fig. 1, the control logic diagram of the vehicle starting process is mainly divided into three major parts:
(1) driver operation intention recognition: obtaining the opening degree (depth) of an accelerator pedal according to a signal of the accelerator pedal of the vehicle, obtaining the change rate (change speed) of the opening degree of the accelerator pedal according to the signal of the accelerator pedal of the vehicle and a derivative value, and identifying the operation of a driver on the accelerator pedal in the starting process according to the opening degree and the change rate of the accelerator pedal to obtain the starting operation intention of the driver;
(2) and (3) calling a clutch state variable: calculating the rotating speeds of a driving disc and a driven disc of the wet clutch through a kinetic equation so as to obtain a rotating speed difference between the driving disc and the driven disc of the wet clutch;
(3) combined control of driver operating intention and clutch state variables: and combining the obtained operation intention of the driver with factors such as the rotating speed difference of the clutch driving disk and the driven disk to obtain the combination or separation oil pressure of the wet clutch so as to control the torque transmission of the clutch. Meanwhile, the impact degree of the vehicle is taken as a target, the magnitude of the torque transmitted by the clutch is controlled by the change rate of the torque, and the quality of the starting process is ensured.
According to a control logic diagram of a starting process, two fuzzy controllers designed in the text are respectively as follows: a driver operation intention controller, a wet clutch oil pressure controller;
driver operation intention controller: based on the opening degree alpha of the accelerator pedal and the change rate thereof
Figure BDA0003530670230000051
And for inputting, the operation intention I of the driver is output, and the starting intention of the driver corresponds to different vehicle starting torque requirements through the opening degree and the change rate of the accelerator pedal.
Assume that the fuzzy language of accelerator pedal opening α is: { very small VS, small S, medium M, large B, very large VB }, the domain of fundamental argument belongs to: [0,1](ii) a Rate of change of accelerator pedal opening
Figure BDA0003530670230000052
The fuzzy language of (1) is: { negative big NB, negative middle NM, negative small NS, zero Z, positive small PS, positive PM, positive big PB }, with the basic domain of discourse being [ -1, 1](ii) a The fuzzy language of the driver's operation intention I is: { very small VS, small S, medium M, large B, very large VB }, the domain of fundamental argument belongs to: [0,1]。
And (3) obtaining a driver starting intention fuzzy control curved surface by combining the fuzzy subset membership function of the input and output variables of the driver starting intention fuzzy controller and formulating a fuzzy control rule, as shown in fig. 2.
Wet clutch oil pressure controller: taking the starting intention and the starting working condition into consideration, adopting a double-layer fuzzy control strategy and taking the driver operation intention I as the firstInput variables of a two-layer fuzzy controller, the second layer of which is the driver's operation intention I and the engine speed omegaeThe rotation speed difference delta omega of the clutch master-slave engineeTo input, the clutch engages or disengages oil pressure to output.
Assume that the fuzzy language of the driver's operation intention I is: { very small VS, small S, medium M, large B, very large VB }, the domain of fundamental argument belongs to: [ -1, 1 ]; the fuzzy language of the rotating speed difference | delta omega | of the clutch driving disk and the clutch driven disk is as follows: { very small VS, small S, medium M, large B, very large VB }, the domain of fundamental argument belongs to: [0, 1 ]; the fuzzy language of the clutch engagement or disengagement oil pressure P is: { negative large VS, negative middle S, negative small MS, zero S, positive small MB, middle B, and positive large VB }, with a basic domain of argument being [0, 1 ].
And (3) formulating a fuzzy control rule according to the fuzzy subset membership function of the input variable and the output variable of the fuzzy controller combined with the oil pressure change rate to obtain a fuzzy control curved surface combined with the oil pressure change rate, as shown in figure 3.
Analysis of a starting process of the wet DCT:
the starting process of the wet DCT clutch is analyzed in detail in six stages, and as shown in FIG. 4, the torque and rotating speed analysis diagram of the starting process is shown.
Stage 1: preparing for starting, wherein the torque of the engine is zero, and the torque transmitted by the clutch is zero; the clutch is in a separation state, and the engine is in an idling state; the vehicle is in a static state and the output rotating speed is zero.
And (2) stage: the engine speed rises, the torque gradually increases, the clutch is still in a separation state, the transmission torque of the clutch is zero, and the transmission torque of the engine is used for overcoming the resistance torque of the whole vehicle and eliminating the idle stroke of the clutch.
And (3) stage: the engine torque is kept constant and the rotation speed is steadily increased.
And (4) stage: the oil pressure of the clutch continues to rise, the transmission torque of the clutch increases, the rotating speed of the engine rises, the vehicle starting resistance is increased at the stage, the torque of the clutch is adjusted to the torque level of the engine at the end of the stage, the rotating speed of the engine begins to increase slowly, and the oil pressure of the clutch can be adjusted to control the transmitted torque, so that the combination speed of the clutch is controlled.
And (5) stage: the clutch torque and the engine torque are equal, so the engine speed begins to remain stable.
And 6: at the beginning of this phase, the engine speed is synchronized with the clutch speed and the clutch is engaged. The torque transmitted by the clutch is reduced and then kept constant, due to the increase in the moment of inertia.
Wet clutch torque transfer model:
the wet clutch realizes torque transmission by controlling oil pressure and the change rate thereof, can be divided into three conditions that torque transmitted by locking, sliding and separating respectively corresponds to static friction torque, sliding friction torque and no torque according to the working state of the friction plates of the driving disk and the driven disk, and the functional relational expression is as follows:
Figure BDA0003530670230000071
when the clutch is in sliding friction, the transmission torque is determined by the oil pressure, and the rotating speed difference between the driving disk and the driven disk of the clutch is delta omegaec＝ωe-ωc(ii) a When the clutch is worn or locked, the transmission torque T of the driving friction plate and the driven friction plate of the clutch under different conditionscCan be expressed as:
Figure BDA0003530670230000072
in the formula: mu is the friction factor, including the static friction factor mu at lock-upsAnd dynamic friction factor mu in slidingc；PnPositive pressure (n.m) on the clutch plates; s is the area of action (m) on the clutch friction plate2) (ii) a Z is the number of friction pairs; r is1And r2The outer diameter (m) and the inner diameter (m) of the friction plate are respectively; sgn (omega)ec) Is a sign function; omegaeIs the engine speed; omegacThe clutch driven plate rotational speed.
Those skilled in the art will appreciate that, in addition to implementing the systems, apparatus, and various modules thereof provided by the present invention in purely computer readable program code, the same procedures can be implemented entirely by logically programming method steps such that the systems, apparatus, and various modules thereof are provided in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Therefore, the system, the device and the modules thereof provided by the present invention can be considered as a hardware component, and the modules included in the system, the device and the modules thereof for implementing various programs can also be considered as structures in the hardware component; modules for performing various functions may also be considered to be both software programs for performing the methods and structures within hardware components.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims (10)

1. A wet clutch launch control method based on driver intent, comprising:
step 1: identifying the operation intention of the driver according to the opening degree and the change rate of the accelerator pedal;
step 2: combining the obtained operation intention of the driver with the rotation speed difference of the driving disc and the driven disc of the wet clutch to deduce the combination or separation oil pressure of the wet clutch;
and step 3: and controlling the torque transmission of the clutch in the starting process of the vehicle according to the combination or separation oil pressure of different speed values to drive the vehicle to start.
2. The method for controlling the start of the wet clutch based on the driver's intention as claimed in claim 1, wherein the opening degree and the change rate of the accelerator pedal are used as the input of the fuzzy controller of the driver's start intention, the output is the driver's operation intention, and the driver's start intention is corresponding to different vehicle start torque demands through the opening degree and the change rate of the accelerator pedal;
and formulating a fuzzy control rule according to the fuzzy subset membership function of the input and output variables of the driver starting intention fuzzy controller to obtain a driver starting intention fuzzy control curved surface.
3. The method for controlling the start of the wet clutch according to the driver's intention as claimed in claim 1, wherein a double-layer fuzzy control strategy is adopted according to the start intention and the start condition, and the hydraulic controller of the wet clutch takes the driver's operation intention, the engine speed, and the difference between the clutch speed and the engine speed as the input, and the output is the clutch engaging or disengaging hydraulic pressure;
and formulating a fuzzy control rule according to fuzzy subset membership functions of input and output variables of the wet clutch oil pressure controller to obtain a combined oil pressure change rate fuzzy control curved surface.
4. The driver intent based wet clutch launch control method of claim 1, wherein the wet clutch launch process comprises:
stage 1: preparing for starting, wherein the torque of the engine and the torque transmitted by the clutch are zero; the clutch is in a separation state, and the engine is in an idling state; the vehicle is in a static state, and the output rotating speed is zero;
and (2) stage: the engine speed is increased, the torque is gradually increased, the clutch is still in a separation state, the transmission torque of the clutch is zero, and the transmission torque of the engine is used for overcoming the resistance torque of the whole vehicle and eliminating the idle stroke of the clutch;
and (3) stage: the torque of the engine is kept constant, and the rotating speed is stably increased;
and (4) stage: the oil pressure of the clutch continues to rise, the transmission torque of the clutch is increased, the rotating speed of the engine is increased, the starting resistance of the vehicle is increased at the stage, the torque of the clutch is adjusted to the level of the torque of the engine at the end of the stage, the rotating speed of the engine begins to increase, and the oil pressure of the clutch is adjusted to control the transmitted torque, so that the combination speed of the clutch is controlled;
and (5) stage: the clutch torque and the engine torque are equal, so the engine speed begins to remain stable;
and 6: at the beginning of this phase, the engine speed is synchronized with the clutch speed and the clutch is engaged, resulting in a reduction in the torque transmitted by the clutch, due to the increase in the moment of inertia, and then remaining unchanged.
5. The driver's intention-based wet clutch starting control method as claimed in claim 1, wherein the wet clutch performs torque transmission by controlling the magnitude of the oil pressure and the change rate thereof, and is divided into a lock-up state, a slip-on state and a release state according to the operating states of the friction plates of the driving and driven discs, the transmitted torques respectively correspond to a static friction torque, a slip-on torque and a no-torque, and the functional relational expression is:
Figure FDA0003530670220000021
when the clutch is worn, the transmission torque is determined by the oil pressure, and the rotating speed difference between the driving disc and the driven disc of the clutch is as follows:
Δωec＝ωe-ωc
when the clutch is worn or locked, the transmission torque T of the driving friction plate and the driven friction plate of the clutch under different conditionscExpressed as:
Figure FDA0003530670220000022
in the formula: mu is the friction factor, including the static friction factor mu at lock-upsAnd dynamic friction factor mu in slidingc；PnPositive pressure on the clutch friction plate; s is the action area on the friction plate of the clutch; z is the number of friction pairs; r is1And r2The outer diameter and the inner diameter of the friction plate are respectively; sgn () is a sign function; omegaeIs the engine speed; omegacThe clutch driven plate rotational speed.
6. A wet clutch launch control system based on driver intent, comprising:
module M1: identifying the operation intention of the driver according to the opening degree and the change rate of the accelerator pedal;
module M2: combining the obtained operation intention of the driver with the rotation speed difference of the driving disc and the driven disc of the wet clutch to deduce the combination or separation oil pressure of the wet clutch;
module M3: and controlling the torque transmission of the clutch in the starting process of the vehicle according to the combination or separation oil pressure of different speed values to drive the vehicle to start.
7. The system for controlling the start of the wet clutch based on the driver's intention as claimed in claim 6, wherein the opening degree and the change rate of the accelerator pedal are used as the input of the fuzzy controller of the driver's intention to start, the output is the driver's operation intention, and the driver's intention to start is corresponding to different vehicle starting torque demands through the opening degree and the change rate of the accelerator pedal;
and formulating a fuzzy control rule according to the fuzzy subset membership function of the input and output variables of the driver starting intention fuzzy controller to obtain a driver starting intention fuzzy control curved surface.
8. The system as claimed in claim 6, wherein a double-layer fuzzy control strategy is adopted according to the starting intention and the starting condition, and the wet clutch hydraulic controller takes the driver operation intention, the engine speed and the clutch master-slave engine speed difference as the input and the output as the clutch combination or separation hydraulic pressure;
and formulating a fuzzy control rule according to fuzzy subset membership functions of input and output variables of the wet clutch oil pressure controller to obtain a combined oil pressure change rate fuzzy control curved surface.
9. The driver intent based wet clutch launch control system of claim 6, wherein the wet clutch launch process comprises:
stage 1: preparing for starting, wherein the torque of the engine and the torque transmitted by the clutch are zero; the clutch is in a separation state, and the engine is in an idling state; the vehicle is in a static state, and the output rotating speed is zero;
and (2) stage: the engine speed is increased, the torque is gradually increased, the clutch is still in a separation state, the transmission torque of the clutch is zero, and the transmission torque of the engine is used for overcoming the resistance torque of the whole vehicle and eliminating the idle stroke of the clutch;
and (3) stage: the torque of the engine is kept constant, and the rotating speed is stably increased;
and (4) stage: the oil pressure of the clutch continues to rise, the transmission torque of the clutch is increased, the rotating speed of the engine is increased, the starting resistance of the vehicle is increased at the stage, the torque of the clutch is adjusted to the level of the torque of the engine at the end of the stage, the rotating speed of the engine begins to increase, and the oil pressure of the clutch is adjusted to control the transmitted torque, so that the combination speed of the clutch is controlled;
and (5) stage: the clutch torque and the engine torque are equal, so the engine speed begins to remain stable;
and 6: at the beginning of this phase, the engine speed is synchronized with the clutch speed and the clutch is engaged, resulting in a reduction in the torque transmitted by the clutch, due to the increase in the moment of inertia, and then remaining unchanged.
10. The system as claimed in claim 6, wherein the wet clutch is configured to transmit torque by controlling the magnitude of the oil pressure and the change rate thereof, and is divided into a lock-up state, a slip-off state and a disengagement state according to the operation states of the friction plates of the driving and driven discs, the transmitted torque corresponds to the static friction torque, the slip-off torque and the no-torque, respectively, and the functional relationship expression is:
Figure FDA0003530670220000031
when the clutch is worn, the transmission torque is determined by the oil pressure, and the rotating speed difference between the driving disc and the driven disc of the clutch is as follows:
Δωec＝ωe-ωc
when the clutch is worn or locked, the transmission torque T of the driving friction plate and the driven friction plate of the clutch under different conditionscExpressed as:
Figure FDA0003530670220000041
in the formula: mu is the friction factor, including the static friction factor mu at lock-upsAnd dynamic friction factor mu in slidingc；PnPositive pressure on the clutch friction plate; s is the action area on the friction plate of the clutch; z is the number of friction pairs; r is1And r2The outer diameter and the inner diameter of the friction plate are respectively; sgn () is a sign function; omegaeIs the engine speed; omegacThe clutch driven plate rotational speed.
CN202210210150.XA 2022-03-03 2022-03-03 Wet clutch starting control method and system based on driver intention Pending CN114683839A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210210150.XA CN114683839A (en) 2022-03-03 2022-03-03 Wet clutch starting control method and system based on driver intention

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210210150.XA CN114683839A (en) 2022-03-03 2022-03-03 Wet clutch starting control method and system based on driver intention

Publications (1)

Publication Number Publication Date
CN114683839A true CN114683839A (en) 2022-07-01

Family

ID=82137135

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210210150.XA Pending CN114683839A (en) 2022-03-03 2022-03-03 Wet clutch starting control method and system based on driver intention

Country Status (1)

Country Link
CN (1) CN114683839A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116181899A (en) * 2023-04-26 2023-05-30 中国第一汽车股份有限公司 Gear shifting control method, device, equipment and medium

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116181899A (en) * 2023-04-26 2023-05-30 中国第一汽车股份有限公司 Gear shifting control method, device, equipment and medium

Similar Documents

Publication Publication Date Title
DE102008013772B4 (en) Torque-based machine control and method for regulating drive torque
Zhang et al. System dynamic modelling and adaptive optimal control for automatic clutch engagement of vehicles
Dong et al. Coordinated clutch slip control for the engine start of vehicles with P2-hybrid automatic transmissions
DE102013206193A1 (en) Pilot and feedback adjustment of engine torque during a clutch engagement
DE102013208239A1 (en) HYBRID TORQUE TEMPERATURE CONTROL DURING A ROLLING POWER PLANT STARTER FOR TRANSMISSION CONTROL
CN101746261A (en) Flywheel driveline and control arrangement
US20100105523A1 (en) Vehicle Launch Using a Transmission Clutch
CN101486343A (en) Vehicle launch using a transmission input clutch
CN114683839A (en) Wet clutch starting control method and system based on driver intention
FR2844569B1 (en) HYDRAULIC PRESSURE CONTROL MECHANISM FOR AUTOMATIC VEHICLE TRANSMISSION AND CONTROL METHOD FOR FRICTION HYDRAULIC CLUTCH DEVICE FOR AUTOMATIC TRANSMISSION OF VEHICLE
CN114379532A (en) Starting control method and system for plug-in hybrid electric vehicle with DCT (discrete cosine transformation)
CN113665558B (en) Method for combining speed regulation control clutch of generator of transmission of hybrid vehicle
JP5803736B2 (en) Control device
RU2495289C1 (en) Method and system for clutch disengagement
CN114763838B (en) Automobile gear shifting control method
CN115366880A (en) Coordination control method and system for double-clutch combined starting of power vehicle carrying DCT (discrete cosine transformation)
DE102014214782B4 (en) METHOD OF OPERATING A TRANSMISSION AND VEHICLE
Trieu Minh Clutch control and vibration reduction for a hybrid electric vehicle
Afzulpurkar Automatic control of clutch engagement and slip for hybrid vehicle
CN115257750A (en) Plug-in hybrid vehicle starting control method and system
CN110360245B (en) Automatic control method and automatic control system of clutch
CN115257749A (en) Coordination control method and system for dynamic processes of starting and mode switching of power vehicle
Zhu et al. Comparative study on the temperature rise of a dry dual clutch under different starting conditions
CN116176555A (en) Hybrid electric vehicle and shift control method thereof
CN108482361A (en) The control method stepped on the gas plus kept off and hybrid power system of hybrid power system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination