CN115163691B - Drive-by-wire clutch system and control method thereof - Google Patents
Drive-by-wire clutch system and control method thereof Download PDFInfo
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- CN115163691B CN115163691B CN202210807741.5A CN202210807741A CN115163691B CN 115163691 B CN115163691 B CN 115163691B CN 202210807741 A CN202210807741 A CN 202210807741A CN 115163691 B CN115163691 B CN 115163691B
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- 238000012937 correction Methods 0.000 claims abstract description 38
- 238000013507 mapping Methods 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 6
- 230000000875 corresponding effect Effects 0.000 claims abstract description 4
- 230000007246 mechanism Effects 0.000 claims description 12
- 230000002159 abnormal effect Effects 0.000 claims description 5
- 238000012986 modification Methods 0.000 claims description 3
- 230000004048 modification Effects 0.000 claims description 3
- 238000005299 abrasion Methods 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
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- 230000009347 mechanical transmission Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D28/00—Electrically-actuated clutches
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/06—Control by electric or electronic means, e.g. of fluid pressure
- F16D48/064—Control of electrically or electromagnetically actuated clutches
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/10—System to be controlled
- F16D2500/102—Actuator
- F16D2500/1021—Electrical type
- F16D2500/1023—Electric motor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/10—System to be controlled
- F16D2500/104—Clutch
- F16D2500/10443—Clutch type
- F16D2500/1045—Friction clutch
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/10—System to be controlled
- F16D2500/11—Application
- F16D2500/1107—Vehicles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/50—Problem to be solved by the control system
- F16D2500/502—Relating the clutch
- F16D2500/50233—Clutch wear adjustment operation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/70—Details about the implementation of the control system
- F16D2500/702—Look-up tables
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/62—Hybrid vehicles
Abstract
The invention provides a drive-by-wire clutch system, a control system and a control method thereof, which are used for correcting a clutch friction torque-release bearing position mapping table according to a position correction instruction; calculating a reference position signal; collecting a position sensor signal; calculating position deviation; judging whether the deviation meets the precision, if so, maintaining the closing state of the brake, and ending the process; if not, opening the brake; the controller calculates a control instruction; the controlled object receives the control instruction of the controller and executes corresponding actions; collecting current of a clutch motor, and estimating resistance moment of the clutch motor; identifying a clutch engagement point location; generating a position correction command, refreshing a clutch friction torque-release bearing position mapping table, and entering the next control cycle. The invention realizes the on-line correction of the position of the joint point, and avoids the problem of serious friction moment deviation caused by abrasion of the friction plate of the linear clutch.
Description
Technical Field
The invention belongs to the technical field of clutches, and particularly relates to a drive-by-wire clutch system, a control system and a control method thereof.
Background
The automobile clutch is a key component in an automobile transmission system, and has the main functions of controlling power interruption of the transmission system and decoupling of the rotating speed of a main end/a secondary end of the clutch, and plays a vital role in the stable starting control and gear selection of the automobile and the mode switching process of the hybrid electric vehicle. In recent years, along with the continuous progress of vehicle intellectualization and automation, automobiles are gradually replaced by drive-by-wire modes based on electric power by mechanical, hydraulic and other control modes. The drive-by-wire clutch is used as a core part of a power system and becomes a research application object of various cart enterprises and part manufacturers.
At present, the relatively wide application of the vehicle field is a wire control friction clutch, which is mainly divided into: three types of drive-by-wire mechanical type, drive-by-wire pneumatic type and drive-by-wire hydraulic type. The pneumatic and hydraulic pressure often need to be equipped with separate pneumatic or hydraulic components, such as air pumps, hydraulic motors, valves, pressure sensors, etc., and have the disadvantages of small application range, high cost, etc. In contrast, the drive-by-wire mechanical clutch has small size, strong environmental adaptability, high efficiency, low production cost and wide attention. However, the clutch assembly of the existing drive-by-wire mechanical clutch is improved based on a manual transmission diaphragm spring clutch, and the strong nonlinearity of the diaphragm spring is not beneficial to the accurate control of the drive-by-wire mechanical clutch, so that the clutch is large in combined impact and serious in abrasion, the comfort of a vehicle is poor, the service lives of relevant parts are short, the driving experience of consumers is reduced, and the use cost is increased.
In the existing diaphragm spring type clutch, the clutch is separated by pushing the inner side of the diaphragm spring through a separating bearing, and otherwise, the clutch is combined. Or an electric diaphragm spring clutch is also provided, the motor is used as power, the power of the motor is transmitted based on mechanical transmission, the output end is connected with a deflector rod to control the sliding of a release bearing, and the release bearing pushes the diaphragm spring to realize the combination/release of the clutch. This solution is the main solution for current dry-drive clutches. In addition, the clutch is also provided with a cloth spring clutch, a local spiral spring and a deflector rod based on the lever principle are arranged on a clutch pressure plate in the circumferential direction, the clutch is combined/separated by pulling the deflector rod, and the spiral spring plays a return role.
The first two employ diaphragm spring clutches, the diaphragm springs have strong nonlinearities. In manual transmissions, this nonlinearity is exploited to maintain constancy of the friction torque. However, for the line-controlled clutch, such nonlinearity makes control design very difficult, and control effect is also difficult to improve, which becomes a difficult problem for controlling the line-controlled clutch.
The third structure adopts a scheme of uniformly distributing spiral springs, and the scheme realizes the linear correlation of the release bearing pressure and the friction torque, but when the clutch rotates at a high speed, the spiral springs deform due to the centrifugal force, so that the clutch pressure changes and the friction torque is unstable. In addition, after the friction plate of the clutch is worn, the joint point of the clutch can shift (in the clutch combining process, the friction plate can be converted into a friction state from a free state along with the movement of the release bearing, and the position of the release bearing at the critical point of the two state conversion is called the joint point), so that the friction moment changes, the performance of the clutch is reduced, and the clutch is damaged in an accelerating way.
Disclosure of Invention
In view of the defects existing in the prior art, the invention provides a drive-by-wire clutch system, a control system and a control method thereof, and a clutch assembly return spring of the drive-by-wire clutch system adopts a special-shaped plate spring with linear characteristics, so that the linear relation between thrust force of a release bearing and friction torque of the clutch is ensured, and meanwhile, the axial installation size of the clutch is reduced. The clutch of the proposed drive-by-wire clutch system takes the form of a "push", i.e. the release bearing is coupled when moving to the clutch side, whereas the clutch is decoupled. The actuating mechanism of the wire control clutch system consists of an actuator, a clutch motor and a brake. When the lifted drive-by-wire clutch system works, the lifted brake is opened, and the clutch motor and the actuator can rotate freely; when the lifted clutch system stops working, the brake is closed, the clutch motor and the actuator are locked, and the position of the release bearing is fixed. The control method of the line-control clutch system can realize an online self-correction function, identify the deviation condition of the clutch joint in real time through state observation, correct the reference position of the clutch joint in time, and solve the serious problem of deviation of friction moment of the linear clutch after the friction plate is worn.
The specific technical scheme is as follows:
the drive-by-wire clutch system comprises a clutch assembly, an electric control executing mechanism and a clutch control unit CCU;
the clutch assembly includes: flywheel, friction plate, pressure plate, abnormal plate spring, clutch housing, release bearing and output shaft;
the electric control executing mechanism comprises: a shifting fork, an actuator, a position sensor, a clutch motor and a brake;
the clutch control unit is provided with a current sensor and is used for controlling the operation of a clutch motor, a brake switch, collecting position sensor signals and monitoring the current of the clutch motor;
the flywheel is fixedly connected with the clutch shell; the friction plate is matched with the output shaft, and the friction plate and the output shaft cannot rotate relatively and slide in a certain range in the axial direction; the friction plate is positioned between the flywheel and the pressure plate; the pressure plate is arranged on the output shaft and can rotate relative to the output shaft and slide axially; the outer end of the special-shaped plate spring is connected with the clutch shell, the special-shaped plate spring is provided with special-shaped protrusions, the positions of the special-shaped protrusions can be in contact with the pressure plate, and the inner end of the special-shaped plate spring is in contact with the release bearing; the separation bearing is arranged on the output shaft.
The release bearing is also matched with the shifting fork and can axially slide on the output shaft under the control of the shifting fork; the shifting fork is connected with the actuator and can rotate along the output axis of the actuator under the control of the actuator; the position sensor is used for directly measuring or indirectly measuring the position of the release bearing and transmitting a position signal to the clutch control unit; the position sensor is used for measuring the position of the actuator; the clutch motor is a power source of the actuator, and the torque and rotation speed supply requirements are met under the control of the clutch control unit;
the brake realizes a switch function and is used for locking the actuator so as to achieve the purpose of fixing the position of the release bearing; the clutch control unit monitors current information of the clutch motor.
The clutch comprises a clutch shell, a plurality of special-shaped plate springs, and a plurality of elastic springs, wherein the outer ends of the special-shaped plate springs are connected with the clutch shell and are uniformly distributed in the clutch shell in a circumferential mode.
The invention also provides a control system of the drive-by-wire clutch system, which comprises a clutch friction torque-release bearing position mapping table, a controller, a controlled object, a position sensor, a current sensor, a state observer and a position correction module;
the clutch friction torque-release bearing position mapping table, the controller, the state observer and the position correction module are implemented in a clutch control unit;
the clutch friction torque-release bearing position mapping table is input as required friction torque, output as a reference position of the release bearing, and receives a position correction instruction to realize on-line modification of a table value; the initial values of the tables are from experimental data;
the controller is a closed-loop controller, inputs a position deviation signal of the release bearing, and outputs a control instruction which can be identified by a controlled object;
the controlled object is the clutch assembly of the drive-by-wire clutch system and the electric control executing mechanism, and can respond to the control instruction requirement of the controller;
the position sensor is arranged on the electric control executing mechanism, collects position information of the release bearing and converts the information into an electric signal;
the current sensor is arranged on the clutch control unit, acquires current information of a clutch motor and converts the information into an electric signal; the input of the state observer is a control instruction and a current signal of the controller, and the output is an observed value of the resistance moment of the clutch motor; the state observer can calculate an output result in real time according to the input;
the position correction module inputs a clutch motor resistance moment observation value and outputs a position correction instruction; and the position correction module is internally provided with a clutch motor resistance moment and a release bearing position mapping relation, obtains a clutch position observation value according to the clutch motor resistance moment, and generates a position correction instruction for modifying a clutch friction torque-release bearing position mapping table.
The invention also provides a control method of the control system of the drive-by-wire clutch system; the method is performed:
firstly, acquiring a required torque and a position correction instruction;
secondly, correcting a clutch friction torque-release bearing position mapping table according to the position correction command;
third, calculating the reference position signal x by taking the required torque as an input b_ref ；
Fourth step, collecting position sensor signal x b ；
Fifth step, utilize equation e xb ＝x b_ref -x b Calculating position deviation;
sixth, judge deviation e xb Whether the precision epsilon is satisfied, if so, maintaining the brake closed state, and ending the process; if the torque is not satisfied, the brake is opened, so that the clutch motor can rotate freely;
seventh, the controller calculates a control instruction; the controlled object receives the control instruction of the controller and executes corresponding actions;
the eighth step is to collect the current i of the clutch motor, and the state observer estimates the resistance moment of the clutch motor according to the command of the controller and the current state;
the ninth step of position correction module identifies the position of a clutch joint according to the resistance moment of the clutch motor;
and tenth, generating a position correction command, refreshing a clutch friction torque-release bearing position mapping table, and entering the next control cycle.
The invention has the technical effects that:
(1) The technical scheme designs the special-shaped plate spring, the special-shaped plate spring belongs to a linear spring, and the release bearing controls the separation/combination of the clutch by pushing the inner end of the special-shaped plate spring, so that the positive pressure of the friction plate of the clutch and the thrust of the release bearing are in linear relation.
(2) According to the technical scheme, the assembly mode of the special-shaped plate spring is designed, the outer end of the special-shaped plate spring is arranged on the clutch shell, and the clutch shell provides radial supporting force for the special-shaped plate spring when in operation, so that the problem of friction moment change caused by centrifugal deformation when the clutch rotates at a high speed is solved. At the same time, the contoured plate spring solution can reduce the axial size of the clutch.
(3) The control method based on the state observer is designed by the technical proposal of the invention, the on-line correction of the position of the combining point is realized, and the problem of serious friction moment deviation caused by abrasion of the friction plate of the linear clutch is avoided.
Drawings
FIG. 1 is a schematic illustration of a brake-by-wire clutch system architecture of the present invention;
FIG. 2 is a schematic view of a shaped leaf spring of the present invention;
FIG. 3 is a schematic view of the assembly of the shaped plate spring and clutch housing of the present invention;
FIG. 4 is a control system diagram of the present brake-by-wire clutch system;
FIG. 5 is a control method of the brake-by-wire clutch system of the present invention.
Detailed Description
The specific technical scheme of the invention is described with reference to the accompanying drawings.
As shown in fig. 1, a clutch-by-wire system is based on a clutch assembly of a linear shaped plate spring 6 and an electrically controlled actuator with a brake 11, position and current sensors. The clutch assembly includes: flywheel 4, friction disc 5, pressure disk 3, abnormal plate spring 6, clutch housing 2, release bearing 7, output shaft 8 constitute. The electric control executing mechanism comprises: fork 9, actuator 1, position sensor 14, current sensor 13, clutch motor 10, brake 11 and clutch control unit 12 (CCU), wherein CCU can control clutch motor 10 operation, brake 11 switch, collect position sensor 14 signal and monitor clutch motor 10 current.
The flywheel 4 of the drive-by-wire clutch system is fixedly connected with the clutch housing 2; the friction plate 5 is matched with the output shaft 8, and the friction plate and the output shaft cannot rotate relatively, so that a certain range of sliding is realized in the axial direction; the friction plate 5 is positioned between the flywheel 4 and the pressure plate 3; the pressure plate 3 is arranged on the output shaft 8 and can rotate and slide axially relative to the output shaft 8; the outer end of the special-shaped plate spring 6 is connected with the clutch housing 2, the special-shaped plate spring 6 is provided with special-shaped protrusions, the positions of the special-shaped protrusions can be in contact with the pressure plate 3, and the inner end of the special-shaped plate spring 6 is in contact with the release bearing 7; the release bearing 7 is mounted on the output shaft 8.
When the release bearing 7 pushes the inner end of the special-shaped plate spring 6, the special-shaped plate spring 6 elastically deforms, the special-shaped protruding part of the special-shaped plate spring 6 moves circularly around the deformation axis, and the clutch pressure plate 3 is pushed to generate pressure between the clutch pressure and the friction plate 5. When the release bearing 7 is evacuated, the shaped plate spring 6 resumes its shape, and the pressure on the clutch disc 3 also disappears.
The release bearing 7 is also matched with the shifting fork 9 and can axially slide on the output shaft 8 under the control of the shifting fork 9; the shifting fork 9 is connected with the actuator 1 and can rotate along the output shaft 8 of the actuator 1 under the control of the actuator 1; the position sensor 14 may be used to directly or indirectly measure the position of the release bearing 7 and to transmit a position signal to the CCU; the position sensor 14 is mounted on the actuator 1 or can be mounted at any position that meets the measurement requirements; the clutch motor 10 is a power source of the actuator 1, and can meet the torque and rotation speed supply requirement under the control of the clutch control unit 12; the brake 11 can realize a switching function and is used for locking the actuator 1 so as to achieve the purpose of fixing the position of the release bearing 7; the clutch is mounted at the tail end of the clutch motor 10, but is not limited to being mounted there, and the braking requirement is satisfied. The clutch control unit 12, i.e. CCU, may monitor the current information of the clutch motor 10.
As shown in fig. 2, the proposed shaped plate spring 6 includes three parts of an inner end, an outer end, and a shaped protrusion.
As shown in fig. 3, the outer end of the shaped plate spring 6 is connected with the clutch housing 2 and is uniformly distributed in the clutch housing 2 in a circumferential manner. Six shaped leaf springs 6 are shown, but not limited to six.
As shown in fig. 4, the control system includes a clutch friction torque-release bearing position map, a controller, a controlled object, a position sensor 14, a current sensor 13, a state observer, a position correction module, and the like. Wherein the clutch friction torque-release bearing position map, controller, state observer, and position correction module, etc. are implemented in the CCU shown in fig. 1.
The clutch friction torque-release bearing position mapping table is input into a required friction torque and output into a reference position of the release bearing, and the mapping table can receive a position correction instruction to realize on-line modification of a table value. The initial values of the tables are from experimental data.
Specifically, as shown in fig. 4, the controller is a closed-loop controller, inputs a position deviation signal of the release bearing, and outputs a control command recognizable by the controlled object.
The controlled object is the clutch assembly of the drive-by-wire clutch system and the electric control executing mechanism, and can respond to the control instruction requirement of the controller;
the position sensor 14 is arranged on the electric control executing mechanism, collects position information of the release bearing and converts the information into an electric signal;
the current sensor 13 is arranged on the clutch control unit, collects current information of a clutch motor and converts the information into an electric signal;
the input of the state observer is a control command and a current signal of the controller, and the output is an observed value of the resistance torque of the clutch motor 10. The state observer can calculate an output result in real time according to the input.
The position correction module inputs the observed value of the resistance moment of the clutch motor 10 and outputs a position correction command. The position correction module is internally provided with a position mapping relation between the resistance moment of the clutch motor 10 and the release bearing 7, and can obtain a clutch position observation value according to the resistance moment of the clutch motor 10 and generate a position correction instruction for modifying a clutch friction torque-release bearing position mapping table.
As shown in fig. 5, the control method of the control system of the drive-by-wire clutch system is that, when the method is executed:
firstly, acquiring a required torque and a position correction instruction;
secondly, correcting a clutch friction torque-release bearing position mapping table according to the position correction command;
third, calculating the reference position signal x by taking the required torque as an input b_ref ；
Fourth step, the position sensor 14 signal x is collected b ；
Fifth step, using the formulae xb ＝x b_ref -x b Calculating position deviation;
sixth, judge deviation e xb Whether the precision epsilon is satisfied, if so, maintaining the closing state of the brake 11, and ending the process; if not, opening the brake 11 to ensure that the clutch motor 10 can rotate freely;
seventh, the controller calculates a control instruction; the controlled object receives the control instruction of the controller and executes corresponding actions;
the eighth step is to collect the current i of the clutch motor 10, and the state observer estimates the resistance moment of the clutch motor 10 according to the controller command and the current state;
the ninth step position correction module identifies the clutch engagement point position according to the resistance torque of the clutch motor 10;
and tenth, generating a position correction command, refreshing a clutch friction torque-release bearing position mapping table, and entering the next control cycle.
Claims (2)
1. The control system of the drive-by-wire clutch system comprises a clutch assembly, an electric control executing mechanism and a Clutch Control Unit (CCU);
the clutch assembly includes: flywheel (4), friction plate (5), pressure plate (3), abnormal plate spring (6), clutch housing (2), release bearing (7) and output shaft (8);
the electric control executing mechanism comprises: a shifting fork (9), an actuator (1), a position sensor (14), a clutch motor (10) and a brake (11);
the clutch control unit CCU (12) is provided with a current sensor (13), the clutch control unit (12) controls the clutch motor (10) to operate, the brake (11) to switch, the current sensor (13) is used for collecting current information of the clutch motor, and the position sensor (14) is used for collecting position information of the release bearing;
the flywheel (4) is connected with the clutch housing (2) through bolts; the friction plate (5) is connected with the output shaft (8) through a spline, and the friction plate and the output shaft cannot rotate relatively, so that sliding in a certain range is realized in the axial direction; the friction plate (5) is positioned between the flywheel (4) and the pressure plate (3); the pressure plate (3) is arranged on the output shaft (8) and can rotate and slide axially relative to the output shaft (8); the outer end of the special-shaped plate spring (6) is connected with the clutch housing (2), the special-shaped plate spring (6) is provided with special-shaped protrusions, the positions of the special-shaped protrusions can be in contact with the pressure plate (3), and the inner end of the special-shaped plate spring (6) is in contact with the release bearing (7); the release bearing (7) is arranged on the output shaft (8);
the release bearing (7) is also matched with the shifting fork (9) and can axially slide on the output shaft (8) under the control of the shifting fork (9); the shifting fork (9) is connected with the actuator (1) and can rotate along the axis of the output shaft (8) of the actuator (1) under the control of the actuator (1); the position sensor (14) is used for directly measuring or indirectly measuring the position of the release bearing (7) and transmitting a position signal to the clutch control unit (12); the clutch motor (10) is a power source of the actuator (1) and meets the torque and rotation speed supply requirement under the control of the clutch control unit (12);
the brake (11) realizes a switching function and is used for locking the actuator (1) to achieve the purpose of fixing the position of the release bearing (7); the clutch control unit (12) monitors current information of the clutch motor (10) through a current sensor (13); the plurality of the abnormal plate springs (6) are arranged, the outer ends of the abnormal plate springs are connected with the clutch housing (2) and are uniformly distributed in the clutch housing (2) in a circumferential mode;
the control system is characterized by comprising a clutch friction torque-release bearing position mapping table, a controller, a state observer and a position correction module;
the clutch friction torque-release bearing position map, controller, state observer and position correction module are implemented in a clutch control unit (12);
the clutch friction torque-release bearing position mapping table is input as required friction torque, output as a reference position of the release bearing, and receives a position correction instruction to realize on-line modification of a table value; the initial values of the tables are from experimental data;
the controller is a closed-loop controller, inputs a position deviation signal of the release bearing, and outputs a control instruction which can be identified by a controlled object;
the controlled object is the clutch assembly and the electric control executing mechanism, and responds to the control instruction requirement of the controller;
the position sensor (14) is arranged on the electric control executing mechanism to collect position information of the release bearing and convert the information into an electric signal;
the current sensor (13) is arranged on the clutch control unit, acquires current information of a clutch motor and converts the information into an electric signal;
the input of the state observer is a control instruction and a current signal of the controller, and the output is an observed value of the resistance moment of the clutch motor (10); the state observer can calculate an output result in real time according to the input;
the position correction module inputs a resistance moment observation value of the clutch motor (10) and outputs a position correction instruction; the position correction module is internally provided with a position mapping relation between the resistance moment of the clutch motor (10) and the position of the release bearing (7), obtains a clutch position observation value according to the resistance moment of the clutch motor (10), and generates a position correction instruction for modifying a clutch friction torque-release bearing position mapping table.
2. The control method of a control system of a brake-by-wire clutch system according to claim 1, comprising the steps of:
firstly, acquiring a required torque and a position correction instruction;
secondly, correcting a clutch friction torque-release bearing position mapping table according to the position correction command;
third, the reference position signal is calculated by taking the required torque as inputx b_ref ；
Fourth, collect the signal of position sensor (14)x b ；
Fifth step, using the formulae xb =x b_ref -x b Calculating position deviation;
sixth, judge the deviatione xb Whether or not to meet the precisionεIf so, maintaining the brake (11) in a closed state, and ending the process; if not, opening a brake (11) to ensure that the clutch motor (10) can rotate freely;
seventh, the controller calculates a control instruction; the controlled object receives the control instruction of the controller and executes corresponding actions;
eighth step, the current of the clutch motor (10) is collectediThe state observer estimates the resistance moment of the clutch motor (10) according to the controller command and the current state;
a ninth step, a position correction module identifies the position of a clutch joint according to the resistance moment of the clutch motor (10);
and tenth, generating a position correction command, refreshing a clutch friction torque-release bearing position mapping table, and entering the next control cycle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210807741.5A CN115163691B (en) | 2022-07-08 | 2022-07-08 | Drive-by-wire clutch system and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210807741.5A CN115163691B (en) | 2022-07-08 | 2022-07-08 | Drive-by-wire clutch system and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115163691A CN115163691A (en) | 2022-10-11 |
| CN115163691B true CN115163691B (en) | 2024-02-06 |
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| CN202210807741.5A Active CN115163691B (en) | 2022-07-08 | 2022-07-08 | Drive-by-wire clutch system and control method thereof |
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| CN103967970A (en) * | 2014-05-16 | 2014-08-06 | 西华大学 | Control mechanism for clutch and control method of control mechanism |
| CN110836226A (en) * | 2018-08-16 | 2020-02-25 | 舍弗勒技术股份两合公司 | Motor vehicle clutch with leaf spring reinforcement and contact plate prepared therefor |
| CN114502857A (en) * | 2019-10-17 | 2022-05-13 | 舍弗勒技术股份两合公司 | Torsional vibration damper |
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| GB1451502A (en) * | 1972-12-21 | 1976-10-06 | Aisin Seiki | Device for displacing a rotatable friction member of a clutch |
| CN1139629A (en) * | 1995-02-01 | 1997-01-08 | 菲希特尔及萨克斯有限公司 | Friction clutch with servo driver |
| CN1526969A (en) * | 2003-03-03 | 2004-09-08 | ¬��Ħ��Ƭ����������Ϲ�˾ | Separating system |
| DE102010025453A1 (en) * | 2009-07-30 | 2011-02-03 | Luk Lamellen Und Kupplungsbau Beteiligungs Kg | Self-adjusting friction clutch for vehicle, has mainspring connected with disk spring lever, and transportation securing device i.e. hook component, preventing rotation of mainspring and/or disk spring lever in transport position of lever |
| CN201953857U (en) * | 2011-03-18 | 2011-08-31 | 刘建 | Automatic clutch control mechanism |
| CN102678779A (en) * | 2012-03-19 | 2012-09-19 | 吉林大学 | Automatic vehicle clutch system driven by motor |
| CN203098618U (en) * | 2012-12-28 | 2013-07-31 | 长城汽车股份有限公司 | Clutch structure capable of improving vehicle starting stationarity |
| CN103362975A (en) * | 2013-07-13 | 2013-10-23 | 临颍县颍机机械制造有限公司 | Grass grasping machine with diaphragm spring clutch |
| CN103967970A (en) * | 2014-05-16 | 2014-08-06 | 西华大学 | Control mechanism for clutch and control method of control mechanism |
| CN110836226A (en) * | 2018-08-16 | 2020-02-25 | 舍弗勒技术股份两合公司 | Motor vehicle clutch with leaf spring reinforcement and contact plate prepared therefor |
| CN114502857A (en) * | 2019-10-17 | 2022-05-13 | 舍弗勒技术股份两合公司 | Torsional vibration damper |
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| Publication number | Publication date |
|---|---|
| CN115163691A (en) | 2022-10-11 |
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