CN115163691A - Line control clutch system and control method thereof - Google Patents
Line control clutch system and control method thereof Download PDFInfo
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- CN115163691A CN115163691A CN202210807741.5A CN202210807741A CN115163691A CN 115163691 A CN115163691 A CN 115163691A CN 202210807741 A CN202210807741 A CN 202210807741A CN 115163691 A CN115163691 A CN 115163691A
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- 230000007246 mechanism Effects 0.000 claims description 12
- 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
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- 230000005489 elastic deformation Effects 0.000 description 1
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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
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Fluid Mechanics (AREA)
- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
Abstract
The invention provides a line control clutch system, a control system and a control method thereof, wherein a clutch friction torque-release bearing position mapping table is corrected according to a position correction instruction; calculating a reference position signal; collecting position sensor signals; calculating a position deviation; judging whether the deviation meets the precision, if so, maintaining the closing state of the brake, and ending the program; if not, the brake is opened; the controller calculates a control instruction; the controlled object receives the control instruction of the controller and executes corresponding action; collecting the current of a clutch motor, and estimating the resistance torque of the clutch motor; identifying the position of a clutch joint point; and 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 online correction of the position of the joint point and avoids the problem of serious friction torque deviation caused by the 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 line-controlled clutch system, and a control system and a control method thereof.
Background
The automobile clutch is a key part in an automobile transmission system, mainly plays a vital role in controlling power interruption of the transmission system and decoupling of the rotating speed of a clutch master/slave end and plays a vital role in the processes of smooth starting control and gear selection of a vehicle and mode switching of a hybrid electric vehicle. In recent years, with the progress of vehicle intellectualization and automation, automobiles are gradually replaced by wire control based on electric power in mechanical and hydraulic control modes. The drive-by-wire clutch is used as a core part of a power system and becomes a research and application object of various large vehicle enterprises and part manufacturers.
At present, the wire-control friction clutch widely applied in the field of vehicles mainly comprises the following components according to a control form: the linear control mechanical type, the linear control pneumatic type, the linear control hydraulic type and the like. The pneumatic and hydraulic systems usually need to be equipped with separate pneumatic or hydraulic components, such as an air pump, a hydraulic motor, a valve, a pressure sensor, and the like, and have the disadvantages of small application range, high cost, and the like. Compared with the prior art, the linear control mechanical clutch has the advantages of small size, strong environment adaptability, high efficiency and low production cost, and is widely concerned. However, the clutch assembly of the existing wire-controlled mechanical clutch is formed by improving a diaphragm spring clutch based on a manual transmission, the strong nonlinearity of a diaphragm spring is not favorable for the accurate control of the wire-controlled mechanical clutch, the combination impact of the clutch is large, the abrasion is serious, the comfort of a vehicle is poor, the service life of related parts is short, the driving experience of a consumer is reduced, and the use cost is increased.
In the existing diaphragm spring type clutch, the inner side of a diaphragm spring is pushed by a release bearing to realize clutch separation, otherwise, the clutch is combined. Or an electric diaphragm spring type clutch is also arranged, a motor is used as power, the power of the motor is transmitted based on mechanical transmission, the output end of the electric diaphragm spring type clutch is connected with a driving lever to control a release bearing to slide, and the release bearing pushes a diaphragm spring to realize the combination/separation of the clutch. This solution is the mainstream solution of the current by-wire dry clutch. In addition, a peripheral spring clutch is also provided, a local spiral spring and a shifting lever based on the lever principle are arranged on a clutch pressure plate in the circumferential direction, the clutch is combined/separated by shifting the shifting lever, and the spiral spring plays a role in returning.
The first two adopt diaphragm spring clutches, and the diaphragm springs have strong nonlinearity. In manual transmissions, this non-linearity is exploited to maintain the constancy of the friction torque. However, for the clutch by wire, the non-linearity makes the control design very difficult, and the control effect is difficult to improve, which becomes a difficult problem for the control of the clutch by wire.
The third structure adopts a scheme of uniformly distributing the spiral springs, the scheme realizes the linear correlation of the pressure of the separation bearing and the friction torque, but when the clutch rotates at high speed, the spiral springs can deform under the action of centrifugal force, so that the pressure of the clutch is changed, and the friction torque is unstable. In addition, in the scheme, after the friction plate of the clutch is worn, the joint point of the clutch can be deviated (in the process of combining the clutch, the friction plate can be changed 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 states is called as the joint point), so that the friction torque is changed, the performance of the clutch is reduced, and the clutch is damaged in an accelerated way.
Disclosure of Invention
In view of the defects in the prior art, the invention provides a line control clutch system, a control system and a control method thereof, wherein a clutch assembly return spring of the line control clutch system adopts a special-shaped plate spring with linear characteristics, so that the linear relation between the thrust of a release bearing and the friction torque of a clutch is ensured, and the axial installation size of the clutch is reduced. The clutch of the proposed wire-controlled clutch system is of the "push" type, i.e. the clutch is engaged when the release bearing moves to the clutch side, and the clutch is disengaged otherwise. The actuating mechanism of the linear control clutch system consists of an actuator, a clutch motor and a brake. When the lifted linear control clutch system works, the lifted brake is opened, and the clutch motor and the actuator can rotate freely; when the clutch system is lifted out of operation, 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 wire control clutch system can realize an online self-correction function, recognize 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 problem that the friction torque of the linear clutch deviates seriously after the friction plate is worn.
The specific technical scheme is as follows:
the line control clutch system comprises a clutch assembly, an electric control actuating mechanism and a clutch control unit CCU;
the clutch assembly includes: the clutch comprises a flywheel, a friction plate, a pressure plate, a special-shaped plate spring, a clutch shell, a release bearing and an output shaft;
the electric control actuating mechanism comprises: the device 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 controls the operation of a clutch motor, a brake switch, the acquisition of a position sensor signal and the monitoring of the current of the clutch motor;
the flywheel is fixedly connected with the clutch shell; the friction plate is matched with the output shaft, the friction plate and the output shaft cannot rotate relatively, and the friction plate and the output shaft 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 and axially slide relative to the output shaft; the outer end of the special-shaped plate spring is connected with the clutch shell, the special-shaped plate spring is provided with a special-shaped bulge, the position of the special-shaped bulge can be contacted with the pressure plate, and the inner end of the special-shaped plate spring is contacted with the release bearing; the release bearing is mounted 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 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 meets the requirement of torque and rotating speed supply under the control of the clutch control unit;
the brake realizes the switch function and is used for locking the actuator to achieve the aim of fixing the position of the release bearing; the clutch control unit monitors current information of the clutch motor.
The special-shaped plate springs are multiple, the outer ends of the special-shaped plate springs are connected with the clutch shell, and the special-shaped plate springs are uniformly distributed in the clutch shell in a circumferential mode.
The invention also provides a control system of the wire control 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 realized in a clutch control unit;
the input of the clutch friction torque-release bearing position mapping table is required friction torque, the output is a reference position of a release bearing, and the mapping table receives a position correction instruction to realize online table value modification; the initial values of the tables are from experimental data;
the controller is a closed-loop controller, the input is a position deviation signal of the separating bearing, and the output is a control instruction which can be identified by a controlled object;
the controlled objects are the clutch assembly of the wire control clutch system and an electric control executing mechanism, and can respond to the control command requirement of a controller;
the position sensor is arranged on the electric control actuating mechanism, collects the position information of the release bearing and converts the information into an electric signal;
the current sensor 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 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 input;
the position correction module inputs the observed value of the resistance moment of the clutch motor and outputs a position correction instruction; the position correction module is internally provided with a mapping relation between the resistance torque of the clutch motor and the position of the release bearing, obtains a clutch position observed value according to the resistance torque of the clutch motor, and generates a position correction instruction for modifying a mapping table of the friction torque of the clutch and the position of the release bearing.
The invention also provides a control method of the control system of the line control clutch system; the method is executed:
the method comprises the steps of firstly, acquiring a required torque and a position correction command;
secondly, correcting a clutch friction torque-release bearing position mapping table according to a position correction command;
thirdly, calculating a reference position signal x by using the required torque as an input b_ref ；
The fourth step, collecting the position sensor signal x b ；
The fifth step, use formula e xb ＝x b_ref -x b Calculating a position deviation;
sixthly, judging the deviation e xb Whether the precision epsilon is met or not, if so, maintaining the closing state of the brake, and ending the program; if not, the brake is opened to ensure that the clutch motor can rotate freely;
seventhly, calculating a control instruction by the controller; the controlled object receives the control instruction of the controller and executes corresponding action;
step eight, collecting the current i of the clutch motor, and estimating the resistance moment of the clutch motor by the state observer according to the instruction of the controller and the current state;
the ninth step position correction module identifies the position of a clutch binding point according to the resistance moment of a clutch motor;
and step ten, 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 invention designs a special-shaped plate spring which belongs to a linear spring, a release bearing controls the separation/combination of a clutch by pushing the inner end of the special-shaped plate spring, and the positive pressure of a clutch friction plate and the thrust of the release bearing are in a 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 installed on the clutch shell, the clutch shell provides radial supporting force for the special-shaped plate spring during working, and the problem of friction torque change caused by centrifugal deformation during high-speed rotation of the clutch is solved. Meanwhile, the special-shaped plate spring scheme can reduce the axial size of the clutch.
(3) The technical scheme of the invention designs a control method based on the state observer, realizes the online correction of the position of the joint point, and avoids the problem of serious friction torque deviation caused by the abrasion of the friction plate of the linear clutch.
Drawings
FIG. 1 is a line-controlled clutch system architecture of the present invention;
FIG. 2 is a schematic view of a shaped leaf spring according to the present invention;
FIG. 3 is a schematic view of the assembly of the shaped leaf spring and clutch housing of the present invention;
FIG. 4 is a control system diagram of the by-wire clutch system of the present invention;
FIG. 5 illustrates a method for controlling a by-wire clutch system according to the present invention.
Detailed Description
The specific technical scheme of the invention is explained by combining the attached drawings.
As shown in fig. 1, a wire-controlled clutch system is based on a clutch assembly of linear profiled leaf springs 6 and an electrically controlled actuator with brakes 11, position and current sensors. The clutch assembly includes: flywheel 4, friction disc 5, pressure disk 3, special-shaped plate spring 6, clutch housing 2, release bearing 7, output shaft 8 are constituteed. The electric control actuating mechanism comprises: the device comprises a shifting fork 9, an actuator 1, a position sensor 14, a current sensor 13, a clutch motor 10, a brake 11 and a clutch control unit 12 (CCU), wherein the CCU can control the operation of the clutch motor 10, the brake 11 is switched on and off, signals of the position sensor 14 are collected, and the current of the clutch motor 10 is monitored.
A 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, the friction plate and the output shaft cannot rotate relatively, and 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 relatively 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 a special-shaped bulge, the position of the special-shaped bulge can be contacted with the pressure plate 3, and the inner end of the special-shaped plate spring 6 is contacted with the release bearing 7; the release bearing 7 is mounted on an 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 generates elastic deformation, the special-shaped convex part of the special-shaped plate spring 6 performs circular motion around a deformation axis, and the clutch pressure plate 3 is pushed to generate pressure between the clutch pressure plate and the friction plate 5. When the release bearing 7 is removed, the deformed plate spring 6 is deformed again, and the pressure on the clutch pressure plate 3 is eliminated.
The release bearing 7 is also matched with a 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 measure the release bearing 7 position directly or indirectly 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 supply requirement of torque and rotating speed under the control of the clutch control unit 12; the brake 11 can realize the switch function and is used for locking the actuator 1 to achieve the purpose of fixing the position of the release bearing 7; the clutch is installed at the tail end of the clutch motor 10, but is not limited to be installed at the tail end, and the braking requirement can be met. The clutch control unit 12, i.e. the CCU, may monitor the current information of the clutch motor 10.
As shown in fig. 2, the proposed shaped leaf spring 6 comprises three parts, an inner end, an outer end and a shaped projection.
As shown in fig. 3, the outer ends of the shaped plate springs 6 are connected with the clutch housing 2 and are uniformly distributed in the clutch housing 2 in a circumferential manner. The figure shows an arrangement of six profiled leaf springs 6, but is not limited to six.
As shown in fig. 4, the control system includes a clutch friction torque-release bearing position mapping table, a controller, a controlled object, a position sensor 14, a current sensor 13, a state observer, and a position correction module. Wherein the clutch friction torque-release bearing position map, controller, state observer, position correction module, and the like are implemented in the CCU shown in fig. 1.
The input of the clutch friction torque-release bearing position mapping table is the required friction torque, the output is the reference position of the release bearing, and the mapping table can receive a position correction instruction to realize online table value modification. The initial values of the tables are from experimental data.
Specifically, as shown in fig. 4, the controller is a closed-loop controller, which receives a position deviation signal of the release bearing and outputs a control command recognizable for the controlled object.
The controlled objects are the clutch assembly of the wire control clutch system and an electric control executing mechanism, and can respond to the control command requirement of a controller;
the position sensor 14 is arranged on the electric control actuating mechanism, collects the 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 resisting moment of the clutch motor 10. The state observer can calculate an output result in real time according to input.
The position correction module inputs the observed value of the resisting moment of the clutch motor 10 and outputs a position correction instruction. The position correction module is internally provided with a mapping relation between the resistance torque of the clutch motor 10 and the position of the release bearing 7, can obtain a clutch position observed value according to the resistance torque of the clutch motor 10, and generates a position correction instruction for modifying a mapping table of the clutch friction torque and the release bearing position.
As shown in fig. 5, the control method of the control system of the by-wire clutch system is that the method is executed:
the method comprises the steps of firstly, acquiring a required torque and a position correction command;
secondly, correcting a clutch friction torque-release bearing position mapping table according to the position correction instruction;
thirdly, calculating a reference position signal x by using the required torque as an input b_ref ；
The fourth step, collecting the position sensor 14 signal x b ；
The fifth step, using formula e xb ＝x b_ref -x b Calculating a position deviation;
sixthly, judging the deviation e xb Whether the precision epsilon is met or not, if so, maintaining the closing state of the brake 11, and ending the program; if not, the brake 11 is opened to ensure that the clutch motor 10 can rotate freely;
seventhly, calculating a control instruction by the controller; the controlled object receives the control instruction of the controller and executes corresponding action;
the eighth step, collecting the current i of the clutch motor 10, and estimating the resisting moment of the clutch motor 10 by a state observer according to the instruction of the controller and the current state;
the ninth step position correction module identifies the position of a clutch joint point according to the resisting moment of the clutch motor 10;
and step ten, generating a position correction command, refreshing a clutch friction torque-release bearing position mapping table, and entering the next control cycle.
Claims (4)
1. The line control clutch system is characterized by comprising a clutch assembly, an electric control actuating mechanism and a Clutch Control Unit (CCU);
the clutch assembly includes: the clutch comprises a flywheel (4), a friction plate (5), a pressure plate (3), a special-shaped plate spring (6), a clutch shell (2), a release bearing (7) and an output shaft (8);
the electric control actuating mechanism comprises: the device comprises a shifting fork (9), an actuator (1), a position sensor (14), a clutch motor (10) and a brake (11);
a current sensor (13) is arranged on the clutch control unit CCU (12), the clutch control unit (12) controls the clutch motor (10) to operate and the brake (11) to be switched on and off, 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 shell (2) through a bolt; the friction plate (5) is connected with the output shaft (8) through a spline, the friction plate and the output shaft cannot rotate relatively, and the friction plate and the output shaft can slide in a certain range 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 relatively rotate and axially slide relative to the output shaft (8); the outer end of the special-shaped plate spring (6) is connected with the clutch shell (2), the special-shaped plate spring (6) is provided with a special-shaped bulge, the position of the special-shaped bulge can be contacted with the pressure plate (3), and the inner end of the special-shaped plate spring (6) is contacted 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 an output shaft (8) of the actuator (1) under the control of the actuator (1); the position sensor (14) is used for directly or indirectly measuring the position of the release bearing (7) and transmitting a position signal to the clutch control unit (12); the position sensor (14) is used for measuring the position of the actuator (1); the clutch motor (10) is a power source of the actuator (1) and meets the requirement of torque and rotating speed supply 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).
2. The clutch-by-wire system according to claim 1, characterized in that the profiled leaf springs (6) are provided in a plurality, connected at their outer ends to the clutch housing (2) and distributed circumferentially and uniformly in the clutch housing (2).
3. The control system of the clutch-by-wire system according to claim 1 or 2, characterized by comprising a clutch friction torque-release bearing position map, a controller, a controlled object, a position sensor (14), a current sensor (13), 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 (12);
the input of the clutch friction torque-release bearing position mapping table is required friction torque, the output is a reference position of a release bearing, and the mapping table receives a position correction instruction to realize online table value modification; the initial values of the table are from experimental data;
the controller is a closed-loop controller, the input is a position deviation signal of the separating bearing, and the output is a control instruction which can be identified by a controlled object;
the controlled objects are the clutch assembly and the electric control actuating mechanism and respond to the control instruction requirement of the controller;
the position sensor (14) is arranged on the electric control actuating mechanism to collect the 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, 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 moment of the clutch motor (10); the state observer can calculate an output result in real time according to input;
the input of the position correction module is a resistance moment observation value of a clutch motor (10), and the output is a position correction instruction; the position correction module is internally provided with a mapping relation between the resistance moment of a clutch motor (10) and the position of a release bearing (7), obtains a clutch position observed 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.
4. The control method of the control system of the clutch-by-wire system according to claim 3, characterized by comprising the steps of:
the method comprises the steps of firstly, acquiring a required torque and a position correction command;
secondly, correcting a clutch friction torque-release bearing position mapping table according to a position correction command;
thirdly, calculating a reference position signal x using the required torque as an input b_ref ；
Fourthly, collecting the signal x of the position sensor (14) b ；
The fifth step, use formula e xb ＝x b_ref -x b Calculating a position deviation;
the sixth step, judge the deviation e xb Whether the precision epsilon is met or not, if so, maintaining the closing state of the brake (11), and ending the program; if not, the brake (11) is opened to ensure that the clutch motor (10) can rotate freely;
step seven, the controller calculates a control instruction; the controlled object receives the control instruction of the controller and executes corresponding action;
the eighth step, collecting the current i of the clutch motor (10), and estimating the resisting moment of the clutch motor (10) by a state observer according to the instruction of the controller and the current state;
the ninth step position correction module identifies the position of a clutch joint point according to the resistance moment of a clutch motor (10);
and step ten, generating a position correction command, refreshing a clutch friction torque-release bearing position mapping table, and entering the next control cycle.
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| Publication number | Publication date |
|---|---|
| CN115163691B (en) | 2024-02-06 |
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