CN115366880A - Coordination control method and system for double-clutch combined starting of power vehicle carrying DCT (discrete cosine transformation) - Google Patents

Coordination control method and system for double-clutch combined starting of power vehicle carrying DCT (discrete cosine transformation) Download PDF

Info

Publication number
CN115366880A
CN115366880A CN202210949224.1A CN202210949224A CN115366880A CN 115366880 A CN115366880 A CN 115366880A CN 202210949224 A CN202210949224 A CN 202210949224A CN 115366880 A CN115366880 A CN 115366880A
Authority
CN
China
Prior art keywords
clutch
starting
driver
intention
oil pressure
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
CN202210949224.1A
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 CN202210949224.1A priority Critical patent/CN115366880A/en
Publication of CN115366880A publication Critical patent/CN115366880A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/18—Propelling the vehicle
    • B60W30/18009—Propelling the vehicle related to particular drive situations
    • B60W30/18027—Drive off, accelerating from standstill
    • 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
    • B60W10/024—Conjoint control of vehicle sub-units of different type or different function including control of driveline clutches including control of torque converters
    • B60W10/026—Conjoint control of vehicle sub-units of different type or different function including control of driveline clutches including control of torque converters of lock-up 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
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/02—Control of vehicle driving stability
    • B60W30/025—Control of vehicle driving stability related to comfort of drivers or passengers
    • 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
    • B60W2510/02—Clutches
    • B60W2510/0208—Clutch engagement state, e.g. engaged or disengaged
    • 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
    • B60W2540/00—Input parameters relating to occupants
    • B60W2540/10—Accelerator pedal position
    • B60W2540/106—Rate of change
    • 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
    • B60W2710/0666—Engine torque
    • B60W2710/0672—Torque change rate

Landscapes

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

Abstract

The invention provides a coordination control method and a system for double-clutch combined starting of a power vehicle carrying DCT (discrete cosine transformation), which comprises the following steps: step S1: acquiring starting conditions and vehicle information; step S2: identifying the starting intention of the driver according to the opening degree and the change rate of the accelerator pedal; and step S3: based on the starting intention of a driver, a clutch combination oil pressure is deduced by combining a wet clutch oil pressure controller, and then the transmission torque is controlled; and step S4: and judging the separation threshold value of the clutch according to the starting intention of the driver. The invention solves the problems of obvious temperature rise and uneven sliding and grinding power of the clutch plate in the starting process of the single clutch of the DCT, reduces the loss of the clutch and prolongs the service life of the clutch; the starting intention of a driver is considered, the slip rate and the separation threshold value of the clutch are judged, the starting dynamic property and the starting economical efficiency of the power vehicle are effectively considered, the starting time is shortened, and the exhaust emission is reduced.

Description

Double-clutch joint starting coordination control method and system for power vehicle carrying DCT (discrete cosine transformation)
Technical Field
The invention relates to the technical field of vehicle starting and process control, in particular to a method and a system for coordinately controlling a starting process of a power vehicle carrying DCT (discrete cosine transformation), and more particularly to a method and a system for coordinately controlling double-clutch joint starting of the power vehicle carrying DCT.
Background
In the starting process of a single clutch of the DCT, the temperature rise of a clutch plate is obvious, the sliding and grinding work is uneven, and the service life of the clutch plate is seriously influenced. The traditional double-clutch combined starting method judges a separation threshold value according to the slip rate of a clutch, and rarely considers the starting intention of a driver. The automobile starting is directly controlled by the driver, and is expressed by the opening degree of the accelerator pedal and the change rate of the opening degree. The problems that the two indexes of the impact degree and the sliding friction work are difficult to balance, the starting time is difficult to follow the requirements of a driver and the like are easily caused without considering the starting intention of the driver.
How to combine various changeable and random starting working conditions in actual life with various starting types of a power vehicle carrying DCT more efficiently is very important.
Patent document CN112677958A (application number: CN 202110025858.3) discloses a vehicle starting control method, system and vehicle, wherein when a vehicle starting demand is detected, a power control unit PCU of a finished vehicle controls a power source torque and a clutch torque slope, a power source torque, a clutch reference torque and a clutch offset torque are acted together, a clutch target transmission torque is finely adjusted in real time according to an actual rotating speed of the power source, and the rotating speed of a power source end is guided to rise to a target rotating speed along with a guide rotating speed until the rotating speed of the power source and the rotating speed of an input shaft of a gearbox are synchronized. However, the patent does not solve the problems that in the starting process of the single clutch of the DCT, the temperature rise of a clutch plate is obvious and the sliding and grinding work is not uniform.
Therefore, a new technical solution is needed to improve the above technical problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a coordination control method and a system for double-clutch joint starting of a power vehicle carrying DCT.
The invention provides a coordination control method for double-clutch combined starting of a power vehicle carrying DCT, which comprises the following steps:
step S1: acquiring starting conditions and vehicle information;
step S2: identifying the starting intention of the driver according to the opening degree and the change rate of the accelerator pedal;
and step S3: based on the starting intention of a driver, a clutch combination oil pressure is deduced by combining a wet clutch oil pressure controller, and then the transmission torque is controlled;
and step S4: and judging the separation threshold value of the clutch according to the starting intention of the driver.
Preferably, in the step S1:
the starting working condition and the vehicle information comprise a driver starting intention and a finished vehicle power demand.
Preferably, in the step S2:
the driver's start intention is defined as a fuzzy amount of [0,1], and is classified into a slow start, a normal start, and a quick start according to the magnitude of the value and the like.
Preferably, in the step S3:
the method comprises the steps of converting engine target torque into accelerator pedal opening through a PID algorithm, limiting the maximum impact degree of the whole vehicle as a control target, combining a wet clutch oil pressure controller to derive clutch combination oil pressure based on the starting intention of a driver, and further controlling transmission torque, wherein the relation can be expressed as follows:
Figure BDA0003788815750000021
in the formula, j is the impact degree, a is the acceleration, t is the time, m is the load of the whole vehicle, and r is the radius of the wheel;
from the above equation, the maximum allowable engine output torque rate is:
Figure BDA0003788815750000022
in the formula: m is the load of the whole vehicle; r is the wheel radius; delta is a rotation mass conversion coefficient; i.e. i 1 The clutch C1 to wheel end speed ratio; i.e. i 2 Clutch C2 to wheel end ratio; t is a unit of c1 、T c2 Torque, η, transmitted by the engine via the clutches C1 and C2, respectively v To total efficiency of the transmission system, j max The maximum longitudinal impact degree of the whole vehicle.
Preferably, the driver starting intention controller combines a fuzzy control algorithm, the opening degree and the change rate of the accelerator pedal are used as input, and the driver starting intention is used as output;
the driver starting intention controller corresponds the driving intention of the driver to different vehicle torque requirements through the opening degree and the change rate of an accelerator pedal, and a fuzzy control rule is formulated according to the fuzzy subset membership function of input and output variables of the driver driving intention fuzzy controller, so that a driver driving intention fuzzy control curved surface is obtained;
the wet clutch oil pressure controller adopts a double-layer fuzzy control strategy according to the starting intention and the driving condition of a driver, in a second-layer fuzzy controller, the starting intention of the driver, the rotating speed of an engine and the rotating speed difference of a clutch master-slave engine are used as input, the clutch is combined or separated to output oil pressure, and a fuzzy control rule is formulated according to the combination of fuzzy subset membership functions of input and output variables of the combination oil pressure change rate fuzzy controller to obtain a combination oil pressure change rate fuzzy control curved surface;
and jointly judging the size of the separation threshold of the auxiliary clutch according to the starting intention of the driver and the reference value of the separation threshold.
The invention provides a double-clutch joint starting coordination control system of a power vehicle carrying DCT, which comprises the following components:
a module M1: acquiring starting conditions and vehicle information;
a module M2: identifying the starting intention of the driver according to the opening degree and the change rate of the accelerator pedal;
a module M3: based on the starting intention of a driver, a clutch combination oil pressure is deduced by combining a wet clutch oil pressure controller, and then the transmission torque is controlled;
a module M4: and judging the separation threshold value of the clutch according to the starting intention of the driver.
Preferably, in said module M1:
the starting condition and the vehicle information comprise a driver starting intention and a whole vehicle power demand.
Preferably, in said module M2:
the driver's starting intention is defined as a fuzzy amount of [0,1], and is classified into slow starting, normal starting, and quick starting according to the magnitude of the value and the like.
Preferably, in said module M3:
the method comprises the following steps of converting engine target torque into opening degree of an accelerator pedal through a PID algorithm, limiting the maximum impact degree of the whole vehicle as a control target, combining a wet clutch oil pressure controller to derive clutch combination oil pressure based on the starting intention of a driver, and further controlling transmission torque, wherein the relation can be expressed as follows:
Figure BDA0003788815750000031
in the formula, j is the impact degree, a is the acceleration, t is the time, m is the load of the whole vehicle, and r is the radius of the wheel;
from the above equation, the maximum allowable engine output torque rate is:
Figure BDA0003788815750000032
in the formula: m is the load of the whole vehicle; r is the wheel radius; delta is a rotating mass conversion coefficient; i all right angle 1 The clutch C1 to wheel end speed ratio; i all right angle 2 Clutch C2 to wheel end ratio; t is c1 、T c2 Torque, η, transmitted by the engine via the clutches C1 and C2, respectively v To total efficiency of the transmission system, j max The maximum longitudinal impact degree of the whole vehicle.
Preferably, the driver starting intention controller is combined with a fuzzy control algorithm, the opening degree and the change rate of the accelerator pedal are used as input, and the driver starting intention is used as output;
the driver starting intention controller corresponds the driving intention of the driver to different vehicle torque requirements through the opening degree and the change rate of an accelerator pedal, and a fuzzy control rule is formulated according to fuzzy subset membership functions of input and output variables of the driver driving intention fuzzy controller in a combined mode to obtain a driver driving intention fuzzy control curved surface;
the wet clutch oil pressure controller adopts a double-layer fuzzy control strategy according to the starting intention and the driving condition of a driver, in a second-layer fuzzy controller, the starting intention of the driver, the rotating speed of an engine and the rotating speed difference of a clutch master-slave engine are used as input, the clutch is combined or separated to output oil pressure, and a fuzzy control rule is formulated according to the combination of fuzzy subset membership functions of input and output variables of the combination oil pressure change rate fuzzy controller to obtain a combination oil pressure change rate fuzzy control curved surface;
and jointly judging the size of the separation threshold of the auxiliary clutch according to the starting intention of the driver and the reference value of the separation threshold.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention solves the problems of obvious temperature rise and uneven sliding and grinding power of the clutch plate in the starting process of the single clutch of the DCT, reduces the loss of the clutch and prolongs the service life of the clutch;
2. the method considers the starting intention of the driver to judge the slip rate and the separation threshold of the clutch, effectively considers the starting dynamic property and the economical efficiency of the power vehicle, shortens the starting time and reduces the exhaust emission;
3. the invention can accurately detect the current vehicle state and the driver requirement, and improve the smoothness and the comfort of drivers and passengers in the starting process of the power vehicle.
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 control logic diagram of a starting process of a power vehicle carrying DCT in the invention;
FIG. 2 is a driver's intent to launch recognition fuzzy controller graph in accordance with the present invention;
FIG. 3 is a diagram of the DCT bind/separate oil pressure change rate fuzzy controller of the present invention.
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 present invention.
Example 1:
according to the method and the system for coordinated control of the starting process of the power vehicle with the DCT, as shown in the figures 1-3, the method comprises the following steps:
step S1: acquiring starting conditions and vehicle information;
step S2: identifying the starting intention of a driver according to the opening degree and the change rate of the accelerator pedal, and dividing the starting intention into slow starting, normal starting and quick starting;
and step S3: based on the starting intention of a driver, a clutch combination oil pressure is deduced by combining a wet clutch oil pressure controller, and then the transmission torque is controlled;
and step S4: and judging the separation threshold value of the clutch according to the starting intention of the driver.
Preferably, the starting condition and the vehicle information in the step S1 include a driver starting intention and a vehicle power demand.
Preferably, the driver's intention to start is recognized based on the accelerator opening and the rate of change thereof, wherein the driver's intention to start is defined as a fuzzy amount of [0,1], and is classified into a slow start, a normal start, and a rapid start according to the range of values thereof and the like.
Preferably, the engine target torque is converted into the opening degree of an accelerator pedal through a PID algorithm, the maximum impact degree of the whole vehicle is limited as a control target, the clutch combination oil pressure is derived by combining a wet clutch oil pressure controller based on the starting intention of a driver, and then the transmission torque is controlled, and the relation can be expressed as:
Figure BDA0003788815750000051
in the formula, j is the impact degree, a is the acceleration, t is the time, m is the load of the whole vehicle, and r is the radius of the wheel;
from the above equation, the maximum allowable engine output torque rate is:
Figure BDA0003788815750000052
in the formula: m is the load of the whole vehicle; r is the wheel radius; delta is a rotation mass conversion coefficient; i.e. i 1 The clutch C1 to wheel end speed ratio; i.e. i 2 Clutch C2 to wheel end ratio; t is c1 、T c2 Torque, η, transmitted by the engine via the clutches C1 and C2, respectively v To total efficiency of the transmission system, j max The maximum longitudinal impact degree of the whole vehicle.
Preferably, a fuzzy control algorithm is combined, so as to obtain the accelerator pedal opening (alpha) of the driver and the change rate thereof
Figure BDA0003788815750000053
For input, the driver's intention to start (I) is output, which is defined as the driver's intention to start controller. The driver starting intention controller: the method comprises the steps that the opening degree and the change rate of an accelerator pedal are used as input, the starting intention of a driver is used as output, the driving intention of the driver corresponds to different vehicle torque requirements through the opening degree and the change rate of the accelerator pedal, and a fuzzy control rule is formulated according to input of a driver driving intention fuzzy controller and a fuzzy subset membership function of output variables, so that a driver driving intention fuzzy control curved surface is obtained;
the wet clutch oil pressure controller: according to the starting intention of a driver and the running condition, a double-layer fuzzy control strategy is adopted, in a second-layer fuzzy controller, the starting intention of the driver, the rotating speed of an engine and the difference between the rotating speed of a main engine and the rotating speed of a slave engine of a clutch are used as input, the combination or separation of the oil pressure of the clutch is used as output, and a fuzzy control rule is established according to the combination of fuzzy subset membership functions of input variables and output variables of the combination oil pressure change rate fuzzy controller, so that a combination oil pressure change rate fuzzy control curved surface is obtained.
Preferably, the magnitude of the separation threshold value of the auxiliary clutch is jointly judged according to the starting intention of the driver and the reference value of the separation threshold value.
The invention also provides a coordinated control method and a coordinated control system for the starting process of the power vehicle carrying the DCT, wherein the system comprises the following modules:
a module M1: acquiring starting conditions and vehicle information;
a module M2: identifying the starting intention of a driver according to the opening degree and the change rate of the accelerator pedal, and dividing the starting intention into slow starting, normal starting and quick starting;
a module M3: based on the starting intention of a driver, a clutch combination oil pressure is deduced by combining a wet clutch oil pressure controller, and then the transmission torque is controlled;
a module M4: and judging the separation threshold value of the clutch according to the starting intention of the driver.
Preferably, the starting condition and the vehicle information in the module M1 include a driver starting intention and a vehicle power demand.
Preferably, the engine target torque is converted into the opening degree of an accelerator pedal through a PID algorithm, the maximum impact degree of the whole vehicle is limited as a control target, the clutch combination oil pressure is derived by combining a wet clutch oil pressure controller based on the starting intention of a driver, and then the transmission torque is controlled, and the relation can be expressed as:
Figure BDA0003788815750000061
from the above equation, the maximum allowable engine output torque rate is:
Figure BDA0003788815750000062
in the formula: m is the load of the whole vehicle; r is the wheel radius; delta is a rotation mass conversion coefficient; i.e. i 1 Clutch C1 to wheel end ratio; i all right angle 2 Clutch C2 to wheel end ratio; t is c1 、T c2 Torque, η, transmitted by the engine via the clutches C1 and C2, respectively v To total efficiency of the transmission system, j max The maximum longitudinal impact degree of the whole vehicle.
The driver starting intention controller: the method comprises the steps that the opening degree and the change rate of an accelerator pedal are used as input, the starting intention of a driver is used as output, the driving intention of the driver corresponds to different vehicle torque requirements through the opening degree and the change rate of the accelerator pedal, and a fuzzy control rule is formulated according to the input of a driver driving intention fuzzy controller and a fuzzy subset membership function of an output variable, so that a driver driving intention fuzzy control curved surface is obtained;
the wet clutch oil pressure controller: according to the starting intention and the running condition of a driver, a double-layer fuzzy control strategy is adopted, in a second-layer fuzzy controller, the starting intention of the driver, the engine rotating speed and the difference between the rotating speeds of a master engine and a slave engine of a clutch are used as input, the combination or separation oil pressure of the clutch is used as output, a fuzzy control rule is established according to the combination of the input of the fuzzy controller combining the oil pressure change rate and the membership function of a fuzzy subset of output variables, and a fuzzy control curved surface combining the oil pressure change rate is obtained.
Preferably, the magnitude of the separation threshold value of the auxiliary clutch is jointly judged according to the starting intention of the driver and the reference value of the separation threshold value.
Example 2:
example 2 is a preferred example of example 1, and the present invention will be described in more detail.
The invention provides a coordinated control method and a coordinated control system for a starting process of a power vehicle carrying DCT (discrete cosine transformation), wherein the key and difficulty of the control of the starting process are the key problems of how to process the identification of driving intentions, the speed of combining oil pressure of a clutch and the like in a short time. The engine and double clutch combined starting process control logic diagram is shown in fig. 1, and is mainly divided into three parts:
(1) identifying starting intention based on driver starting;
(2) controlling the combination oil pressure of the target combination and auxiliary clutch;
(3) disengagement threshold control of the auxiliary clutch.
A starting process strategy is established based on double-layer fuzzy control, the maximum torque change rate is limited according to the maximum impact index, the starting intention of a driver is identified through the opening degree and the change rate of the accelerator pedal, and the starting intention is divided into slow starting, normal starting and quick starting. And deducing clutch combination oil pressure by combining the starting intention, and further controlling the clutch to transmit torque. Meanwhile, the size of the separation threshold value of the auxiliary clutch is judged together according to the starting intention of the driver and the separation threshold value reference value.
The starting condition and the vehicle information comprise a driver starting intention and a whole vehicle power demand.
The starting intention of the driver is recognized through the opening degree and the change rate of the accelerator pedal, and the starting intention is divided into slow starting, normal starting and quick starting.
The method comprises the following steps of converting engine target torque into opening degree of an accelerator pedal through a PID algorithm, limiting the maximum impact degree of the whole vehicle as a control target, combining a wet clutch oil pressure controller to derive clutch combination oil pressure based on the starting intention of a driver, and further controlling transmission torque, wherein the relation can be expressed as follows:
Figure BDA0003788815750000081
from the above equation, the maximum allowable engine output torque rate is:
Figure BDA0003788815750000082
in the formula: m is the load of the whole vehicle; r is the wheel radius; delta is a rotating mass conversion coefficient; i.e. i 1 The clutch C1 to wheel end speed ratio; i.e. i 2 Clutch C2 to wheel end ratio; t is c1 、T c2 Torque, η, transmitted by the engine via the clutches C1 and C2, respectively v To total efficiency of the transmission system, j max The maximum longitudinal impact degree of the whole vehicle.
According to a starting process control logic diagram of a power vehicle carrying DCT, two fuzzy controllers designed in the text are respectively: the driver operates the starting intention controller and the wet clutch oil pressure controller.
Driver launch intention controlThe device comprises: based on the opening degree alpha of the accelerator pedal and the change rate thereof
Figure BDA0003788815750000083
For input, the driver's initiation intention I is output. The starting intention of the driver is corresponding to different vehicle running torque requirements through the opening degree of the accelerator pedal and the change rate of the opening degree 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) }, basic discourse field ∈: [0,1](ii) a Rate of change of accelerator pedal opening
Figure BDA0003788815750000084
The fuzzy language of (1) is: { negative large (NB), negative Medium (NM), negative Small (NS), zero (Z), positive Small (PS), positive Medium (PM), positive large (PB) }, basic domain of discourse e: [ -1,1](ii) a The fuzzy language of the starting intention (I) of the driver is as follows: { Very Small (VS), small (S), medium (M), large (B), very large (VB) }, basic discourse field ∈: [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 figure 3.
Wet clutch oil pressure controller: taking the starting intention and the starting condition into consideration, adopting a double-layer fuzzy control strategy, taking the driver starting intention I as an input variable of a second-layer fuzzy controller, and taking the driving intention I and the engine rotating speed omega on the second layer e Speed difference delta omega between clutch main and engine e To input, the clutch engages or disengages oil pressure to output.
Assume that the fuzzy language of the driver's intention to start (I) is: { Very Small (VS), small (S), medium (M), large (B), very large (VB) }, basic discourse field ∈: [ -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) }, basic discourse field ∈: [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), positive large (VB) }, the basic discourse field epsilon: [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.
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 double-clutch joint starting coordination control method for a power vehicle carrying DCT is characterized by comprising the following steps:
step S1: acquiring starting conditions and vehicle information;
step S2: identifying a starting intention of a driver according to the opening degree and the change rate of the accelerator pedal;
and step S3: based on the starting intention of a driver, a clutch combination oil pressure is deduced by combining a wet clutch oil pressure controller, and then the transmission torque is controlled;
and step S4: and judging the separation threshold value of the clutch according to the starting intention of the driver.
2. The method for coordinately controlling a dual clutch joint start of a power vehicle equipped with a DCT as claimed in claim 1, wherein in step S1:
the starting working condition and the vehicle information comprise a driver starting intention and a finished vehicle power demand.
3. The method for coordinately controlling a dual clutch joint start of a power vehicle equipped with a DCT as claimed in claim 1, wherein in step S2:
the driver's start intention is defined as a fuzzy amount of [0,1], and is classified into a slow start, a normal start, and a quick start according to the magnitude of the value and the like.
4. The method for coordinately controlling a dual clutch joint start of a power vehicle equipped with a DCT as claimed in claim 1, wherein in step S3:
the method comprises the steps of converting engine target torque into accelerator pedal opening through a PID algorithm, limiting the maximum impact degree of the whole vehicle as a control target, combining a wet clutch oil pressure controller to derive clutch combination oil pressure based on the starting intention of a driver, and further controlling transmission torque, wherein the relation can be expressed as follows:
Figure FDA0003788815740000011
in the formula, j is the impact degree, a is the acceleration, t is the time, m is the load of the whole vehicle, and r is the radius of the wheel;
from the above equation, the maximum allowable engine output torque rate is:
Figure FDA0003788815740000012
in the formula: m is the load of the whole vehicle; r is the wheel radius; delta is a rotation mass conversion coefficient; i.e. i 1 The clutch C1 to wheel end speed ratio; i.e. i 2 Clutch C2 to wheel end ratio; t is c1 、T c2 Torque, η, transmitted by the engine via the clutches C1 and C2, respectively v To total efficiency of the transmission system, j max The maximum longitudinal impact degree of the whole vehicle.
5. The method for coordinately controlling double-clutch joint starting of a power vehicle carrying a DCT as defined in claim 1, wherein:
the driver starting intention controller combines a fuzzy control algorithm, the opening degree and the change rate of an accelerator pedal are used as input, and the driver starting intention is used as output;
the driver starting intention controller corresponds the driving intention of the driver to different vehicle torque requirements through the opening degree and the change rate of an accelerator pedal, and a fuzzy control rule is formulated according to fuzzy subset membership functions of input and output variables of the driver driving intention fuzzy controller in a combined mode to obtain a driver driving intention fuzzy control curved surface;
the wet clutch oil pressure controller adopts a double-layer fuzzy control strategy according to the starting intention and the driving condition of a driver, in a second-layer fuzzy controller, the starting intention of the driver, the rotating speed of an engine and the rotating speed difference of a clutch master-slave engine are used as input, the clutch is combined or separated to output oil pressure, and a fuzzy control rule is formulated according to the combination of fuzzy subset membership functions of input and output variables of the combination oil pressure change rate fuzzy controller to obtain a combination oil pressure change rate fuzzy control curved surface;
and jointly judging the size of the separation threshold value of the auxiliary clutch according to the starting intention of the driver and the reference value of the separation threshold value.
6. The utility model provides a carry on DCT's power vehicle double clutch and unite coordinated control system of starting which characterized in that includes:
a module M1: acquiring starting conditions and vehicle information;
a module M2: identifying the starting intention of the driver according to the opening degree and the change rate of the accelerator pedal;
a module M3: based on the starting intention of a driver, a clutch combination oil pressure is deduced by combining a wet clutch oil pressure controller, and then the transmission torque is controlled;
a module M4: and judging the separation threshold value of the clutch according to the starting intention of the driver.
7. The coordinated control system for double-clutch combined start of a DCT-equipped powered vehicle as defined in claim 1, wherein in the module M1:
the starting working condition and the vehicle information comprise a driver starting intention and a finished vehicle power demand.
8. The coordinated control system for double-clutch joint starting of a power vehicle carrying a DCT as recited in claim 1, wherein in the module M2:
the driver's start intention is defined as a fuzzy amount of [0,1], and is classified into a slow start, a normal start, and a quick start according to the magnitude of the value and the like.
9. The coordinated control system for double-clutch joint starting of a power vehicle carrying a DCT as recited in claim 1, wherein in the module M3:
the method comprises the steps of converting engine target torque into accelerator pedal opening through a PID algorithm, limiting the maximum impact degree of the whole vehicle as a control target, combining a wet clutch oil pressure controller to derive clutch combination oil pressure based on the starting intention of a driver, and further controlling transmission torque, wherein the relation can be expressed as follows:
Figure FDA0003788815740000031
in the formula, j is the impact degree, a is the acceleration, t is the time, m is the load of the whole vehicle, and r is the radius of the wheel;
from the above equation, the maximum allowable engine output torque rate is:
Figure FDA0003788815740000032
in the formula: m is the load of the whole vehicle; r is the wheel radius; delta is a rotation mass conversion coefficient; i.e. i 1 The clutch C1 to wheel end speed ratio; i.e. i 2 Clutch C2 to wheel end ratio; t is c1 、T c2 Torque, η, transmitted by the engine via the clutches C1 and C2, respectively v To total efficiency of the transmission system, j max The maximum longitudinal impact degree of the whole vehicle.
10. The DCT-equipped dual-clutch joint start coordination control system for the power vehicle as claimed in claim 1, wherein the DCT-equipped dual-clutch joint start coordination control system comprises:
the driver starting intention controller combines a fuzzy control algorithm, takes the opening degree and the change rate of an accelerator pedal as input, and takes the driver starting intention as output;
the driver starting intention controller corresponds the driving intention of the driver to different vehicle torque requirements through the opening degree and the change rate of an accelerator pedal, and a fuzzy control rule is formulated according to the fuzzy subset membership function of input and output variables of the driver driving intention fuzzy controller, so that a driver driving intention fuzzy control curved surface is obtained;
the wet clutch oil pressure controller adopts a double-layer fuzzy control strategy according to the starting intention and the driving condition of a driver, in a second-layer fuzzy controller, the starting intention of the driver, the engine speed and the difference between the master engine speed and the slave engine speed of the clutch are used as input, the combination or separation oil pressure of the clutch is used as output, and a fuzzy control rule is formulated according to the combination of the input of the combination oil pressure change rate fuzzy controller and the fuzzy subset membership function of an output variable to obtain a combination oil pressure change rate fuzzy control curved surface;
and jointly judging the size of the separation threshold of the auxiliary clutch according to the starting intention of the driver and the reference value of the separation threshold.
CN202210949224.1A 2022-08-09 2022-08-09 Coordination control method and system for double-clutch combined starting of power vehicle carrying DCT (discrete cosine transformation) Pending CN115366880A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210949224.1A CN115366880A (en) 2022-08-09 2022-08-09 Coordination control method and system for double-clutch combined starting of power vehicle carrying DCT (discrete cosine transformation)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210949224.1A CN115366880A (en) 2022-08-09 2022-08-09 Coordination control method and system for double-clutch combined starting of power vehicle carrying DCT (discrete cosine transformation)

Publications (1)

Publication Number Publication Date
CN115366880A true CN115366880A (en) 2022-11-22

Family

ID=84062766

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210949224.1A Pending CN115366880A (en) 2022-08-09 2022-08-09 Coordination control method and system for double-clutch combined starting of power vehicle carrying DCT (discrete cosine transformation)

Country Status (1)

Country Link
CN (1) CN115366880A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116292876A (en) * 2023-02-23 2023-06-23 广州汽车集团股份有限公司 Vehicle starting control method, device, equipment and storage medium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116292876A (en) * 2023-02-23 2023-06-23 广州汽车集团股份有限公司 Vehicle starting control method, device, equipment and storage medium
CN116292876B (en) * 2023-02-23 2024-04-26 广州汽车集团股份有限公司 Vehicle starting control method, device, equipment and storage medium

Similar Documents

Publication Publication Date Title
CN1986271B (en) Coast-down shift control device for a vehicle
CN101898549B (en) hybrid electric powertrain
CN104487299B (en) The equipment controlling for the coast of vehicle and method
DE102008013772B4 (en) Torque-based machine control and method for regulating drive torque
CN101966848B (en) Motor-assist shift control in a hybrid vehicle transmission
US9598085B2 (en) Regenerative-braking transmission downshift torque limiting
CN101342901B (en) Method for controlling idle stop mode in hybrid electric vehicle
US7998024B2 (en) System for using mechanical power to operate a hybrid electric vehicle
JP4135107B2 (en) Hybrid vehicle drive device and control method thereof
CN101746261A (en) Flywheel driveline and control arrangement
DE102013208239A1 (en) HYBRID TORQUE TEMPERATURE CONTROL DURING A ROLLING POWER PLANT STARTER FOR TRANSMISSION CONTROL
CN103863307A (en) Shift control method and system for hybrid vehicle
US20150274146A1 (en) Clutch stroke adaptation on engine shutdown
CN114379532A (en) Starting control method and system for plug-in hybrid electric vehicle with DCT (discrete cosine transformation)
US10562521B2 (en) Method for controlling hydraulic pressure refilling operation for engine clutch of hybrid electric vehicle
CN102062166A (en) Optimized clutch control method based on wet clutch
CN204623112U (en) A kind of hybrid electric drive system
CN115366880A (en) Coordination control method and system for double-clutch combined starting of power vehicle carrying DCT (discrete cosine transformation)
WO2013022038A1 (en) Control device
CN109969163A (en) Vehicle console device
CN113665558B (en) Method for combining speed regulation control clutch of generator of transmission of hybrid vehicle
CN115257750A (en) Plug-in hybrid vehicle starting control method and system
JP4288171B2 (en) Automotive drivetrain and drivetrain control method
CN115257749A (en) Coordination control method and system for dynamic processes of starting and mode switching of power vehicle
CN114683839A (en) Wet clutch starting control method and system based on driver intention

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