CN104290737A - Brake master cylinder with function of automatic removal of brake clearance - Google Patents
Brake master cylinder with function of automatic removal of brake clearance Download PDFInfo
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- CN104290737A CN104290737A CN201410557619.2A CN201410557619A CN104290737A CN 104290737 A CN104290737 A CN 104290737A CN 201410557619 A CN201410557619 A CN 201410557619A CN 104290737 A CN104290737 A CN 104290737A
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- drive motor
- brake cylinder
- master brake
- brake
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T2201/00—Particular use of vehicle brake systems; Special systems using also the brakes; Special software modules within the brake system controller
- B60T2201/12—Pre-actuation of braking systems without significant braking effect; Optimizing brake performance by reduction of play between brake pads and brake disc
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T2220/00—Monitoring, detecting driver behaviour; Signalling thereof; Counteracting thereof
- B60T2220/04—Pedal travel sensor, stroke sensor; Sensing brake request
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T2220/00—Monitoring, detecting driver behaviour; Signalling thereof; Counteracting thereof
- B60T2220/06—Adjustment of accelerator pedal reaction forces
Abstract
The invention discloses a brake master cylinder with a function of automatic removal of a brake clearance and overcomes the problem that acting force lags. The brake master cylinder comprises a hydraulic brake subsystem and a motor drive subsystem; the motor drive subsystem comprises a motor drive mechanism (3), an accelerator pedal position sensor (5), a brake pedal positioner sensor (6), a pressure sensor (15) and a drive motor control module (16). The drive motor control module (16) is connected with the pressure sensor (15) and is connected with the brake pedal positioner sensor (6). The drive motor control module (16) is connected with the accelerator pedal position sensor (5) and is also connected with a drive motor (9) and a hydraulic electronic control unit (17) of the hydraulic brake subsystem. A gear (8) of the motor drive mechanism (3) meshes with a brake master cylinder push rod (10) of the hydraulic brake subsystem.
Description
Technical field
The invention belongs to automobile technical field, or rather, the present invention relates to a kind of master brake cylinder with brake clearance automatic eliminating function.
Background technology
Automobile in advancing needs to slow down the automobile of (keeping the speed of a motor vehicle to stablize when comprising descent run), stagnation of movement should reliable resident original place, this to maintenance vehicle safety travel, avoid traffic accident very important, these functions are born by the brake system of automobile.Typical brake system is generally made up of drg and brake operating mechanism two parts.Drg is generally arranged on wheel, and such lock torque directly can produce braking force at ground connection place; The structure of brake operation structure and composition more complicated, the most basic brake operating mechanism must include braking force control system, transmission device and braking warning device, can increase energy supply device and brakig force distribution mechanism if desired.The effect of braking force control system is the size controlling to produce braking force, as brake treadle mechanism and master brake cylinder; The effect of braking transmission device is that the actuating force of people is transferred to drg, as brake pipeline system etc.; Braking warning device breaks down in order to remind certain pipeline in chaufeur brake system.Master brake cylinder is the main brake component in car hydraulics, and the braking liquid exported by it inputs the brake wheel cylinder on brake disc through oil outlet by brake piping, thus realizes the object of automobile brake.
Drg in brake system is the frictin braek utilizing the friction of retaining element and rotating element running surface to produce lock torque, and the friction brake that current all kinds of automobile utilizes can be divided into drum brake mechanism and plate disc brake.The initial position of drg when not working, suitable gap (i.e. brake clearance) should be had between its friction lining and brake wheel (or brake disc), its setting value is specified by car manufacturer, general drum brake mechanism gap is between 0.2 ~ 0.5mm, disk brake clearance is between 0.1 ~ 0.2mm, in brake operation process, the continuous wearing and tearing of friction lining can cause brake clearance to increase gradually.
From chaufeur push down on the pedal, braking liquid by fluid reservoir through master brake cylinder, wheel cylinder is arrived by brake piping, wheel cylinder promotes friction lining and brake disc, thus produce friction drag help automobile brake, this process need regular hour completes, and in addition because current brake system has gap from brake pedal to master brake cylinder, between friction lining to brake disc, which results in hysteresis quality during brake system effect.Prepare braking from chaufeur and produce braking force to these gaps of elimination, approximately need the time of 0.1 ~ 0.2 second, be 100,000 ms/h calculate with the speed of a motor vehicle, automobile now can travel the distance of about 3 ~ 6 meters, and this is very dangerous for emergency braking.
In order to improve the safety of automobile, current also have some based on the automotive safety technology of initiatively braking.The pre-impact safety system Pre-Collision System (PCS) of such as Toyota Company, pre-safe system of the CMBS (Collision Mitigation Brake System) of Honda Company and benz etc., can make self initiatively to produce braking effect by car retardation (not necessarily stopped completely by vehicle and stop) thus the raising safety of driving a vehicle when vehicle runs into certain danger situation.Urban safety system (City Safety) is the anti-collision technique released by Volvo Aktiebolaget, urban safety system as a up-to-date active safety technologies, the rear-end collision during low speed driving that it can help driver to avoid city traffic common.When the speed of vehicle reaches 30km/h, this cover system will start automatically, monitors traffic, the situation especially in first 6 meters of headstock by the optical radar system on front windshield.Current vehicle brake, when stopping or having other obstacle, this cover system first can reinforcing in brake system automatically, shortens braking distance to help chaufeur before making action; Or it by adjustment direction dish, can also change vehicle running path, with avoiding obstacles.Certainly, if distance obstacle is very near, this cover system can automatic emergency brake and without the need to the operation of chaufeur.
Although have now many companies all in the research technology that initiatively braking is relevant, have some even to introduce to the market, these active braking technologies configure complexity mostly, and cost is higher, needs the cooperations such as acquisition radar, generally only has limousine just can select dress.And there is no now the special active cancellation element delayed for brake system application force.
Summary of the invention
Technical matters to be solved by this invention overcomes the delayed problem of application force that existing hydraulic brake system exists, and provides a kind of master brake cylinder with brake clearance automatic eliminating function.
For solving the problems of the technologies described above, the present invention adopts following technical scheme to realize: the described master brake cylinder with brake clearance automatic eliminating function includes hydraulic brake subsystem and motor drive system.
Described motor drive system comprises motor-driven mechanism, accelerator pedal position sensor, brake pedal position sensor, pressure sensor and drive motor control module.
Described drive motor control module is connected with pressure sensor electric wire, drive motor control module is connected with brake pedal position sensor electric wire, drive motor control module is connected with accelerator pedal position sensor electric wire, drive motor control module is connected with drive motor electric wire, drive motor control module is connected with the hydraulic electric control unit electric wire in hydraulic brake subsystem, and the gear in motor-driven mechanism and the master brake cylinder push rod in hydraulic brake subsystem are connected with a joggle.
Drive motor control module described in technical scheme comprises microcontroller, CAN transceiver chip and motor drive ic.Microcontroller adopts model to be the chip of SAK-XC878-16FFA; CAN transceiver chip adopts model to be the chip of TLE6251GS; Motor drive ic adopts model to be the chip of L298N.
The pin P1.1 of microcontroller is connected with the c2 pin of CAN transceiver chip, and the pin P1.4 of microcontroller is connected with the c1 pin of CAN transceiver chip; Pin P3.1, the pin P3.2 of microcontroller, pin P3.3 and pin P3.4 are connected with d4 pin with the d1 pin of motor drive ic, d2 pin, d3 pin successively.
Drive motor control module described in technical scheme is connected with pressure sensor (15) electric wire, drive motor control module is connected with brake pedal position sensor electric wire, drive motor control module is connected with accelerator pedal position sensor electric wire, drive motor control module is connected with drive motor electric wire, and drive motor control module is connected with the hydraulic electric control unit electric wire in hydraulic brake subsystem and refers to: the pin AN3 of microcontroller is connected with the interface q of pressure sensor; The pin AN2 of microcontroller is connected with the interface p of brake pedal position sensor; The pin AN1 of microcontroller is connected with the interface o of accelerator pedal position sensor; Pin d5, the pin d6 of motor drive ic, pin d7 and pin d8 are connected with interface m4 with interface m1, the interface m2 of drive motor, interface m3 successively, and the pin c6 of CAN transceiver chip is connected with interface a2 with the interface a1 of hydraulic electric control unit successively with pin c7.
Motor-driven mechanism described in technical scheme also includes drive motor.Gear is arranged on the output shaft of drive motor, and adopt bearing pin that gear is fixedly connected with the output shaft of drive motor, gear is arranged in immediately below the master brake cylinder push rod of hydraulic brake subsystem, and the rotation axis of gear is space crossed vertical with the rotation axis of master brake cylinder push rod; Described drive motor adopts asynchronous motor, permanent magnet brushless electromotor or stepping motor.
Motor drive ic when drive motor described in technical scheme adopts permanent magnet brushless electromotor in drive motor control module adopts model to be the chip of DRV8312, the pin P4.1 of the microcontroller in drive motor control module, pin P4.2, pin P4.3, pin P4.4, pin P4.5 and pin P4.6 is the pin d1 of the chip of DRV8312 successively with model, pin d2, pin d3, pin d4, pin d5 is connected with pin d6, model is the pin d7 of the chip of DRV8312, pin d8 and pin d9 successively with the interface m1 of permanent magnetic brushless, interface m2 is connected with interface m3.
Motor drive ic when drive motor described in technical scheme adopts asynchronous motor in drive motor control module adopts model to be the chip of TLE5205, pin P3.1 and the pin P3.2 of the microcontroller in drive motor control module are that the pin IN1 of the chip of TLE5205 is connected with pin IN2 successively with model, and model is that the pin OUT1 of the chip of TLE5205 is connected with interface m2 with the interface m1 of asynchronous motor successively with pin OUT2.
Hydraulic brake subsystem described in technical scheme also comprises brake pedal, connecting rod, master brake cylinder, hydraulic electric control unit, front revolver drg, rear right wheel drg, front right wheel drg and rear revolver drg.The right-hand member of brake pedal and connecting rod is hinged, the right-hand member of the master brake cylinder push rod in the left end of connecting rod and master brake cylinder is hinged, the oil inlet and outlet in master brake cylinder second chamber of master brake cylinder is connected with a mouth pipeline of hydraulic electric control unit, the oil inlet and outlet in master brake cylinder first chamber of master brake cylinder is connected with the b mouth pipeline of hydraulic electric control unit, the c mouth of hydraulic electric control unit is connected with the oil inlet and outlet pipeline of rear right wheel drg with front revolver drg, and the d mouth of hydraulic electric control unit is connected with the oil inlet and outlet pipeline of front right wheel drg with rear revolver drg.
Master brake cylinder push rod described in technical scheme is cylindrical straight-bar class formation part, left section of master brake cylinder push rod is cylindrical polished rod section, right section of master brake cylinder push rod is processed with the tooth be meshed with gear, namely right section of master brake cylinder push rod has tooth section for columniform, and master brake cylinder pusher structure will meet: the high order end of tooth section that has on master brake cylinder push rod should be greater than the maximum functional stroke of master brake cylinder push rod to the distance of the cylinder body low order end of master brake cylinder; The length of tooth section that has of master brake cylinder push rod also should be greater than the maximum functional stroke of master brake cylinder push rod.
Compared with prior art the invention has the beneficial effects as follows:
1. the master brake cylinder with brake clearance automatic eliminating function of the present invention is a set of motor pushing mechanism structurally in parallel with master cylinder push rod with the key distinction of traditional braking master cylinder, motor pushing mechanism does not affect normal brake application, and device is simple.
2. of the present inventionly only need on the basis of existing master cylinder push rod with the active master brake cylinder in the master brake cylinder of brake clearance automatic eliminating function, a motor pushing mechanism in parallel, do not need to carry out large change to traditional brake system, structure is simply easy to realize, cost is lower.
3. the master brake cylinder with brake clearance automatic eliminating function of the present invention employs motor as driver train, and motor response is fast, precise control, method are ripe.
4. the master brake cylinder with brake clearance automatic eliminating function of the present invention can the brake system in-service time of actv. when reducing emergency braking, and less stopping distance, improves the safety of vehicle.
5. the control process logic of the master brake cylinder with brake clearance automatic eliminating function of the present invention is simply clear, easily operates.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further illustrated:
Fig. 1 is the brake master cylinder structure schematic block diagram with brake clearance automatic eliminating function of the present invention;
Fig. 2 is the structure with hydraulic brake subsystem structure, hydraulic brake circuit, motor drive system in the master brake cylinder of brake clearance automatic eliminating function of the present invention and annexation schematic block diagram.
Fig. 3-a is the front view with the rack and pinion drive mechanism in the master brake cylinder of brake clearance automatic eliminating function of the present invention;
Fig. 3-b is the left view with the rack and pinion drive mechanism in the master brake cylinder of brake clearance automatic eliminating function of the present invention;
Fig. 4 is the structural representation of drive motor control module when adopting stepping motor in the master brake cylinder with brake clearance automatic eliminating function of the present invention;
Fig. 5 is the structural representation of drive motor control module when adopting permanent magnetic brushless in the master brake cylinder with brake clearance automatic eliminating function of the present invention;
Fig. 6 is the structural representation of drive motor control module when adopting asynchronous motor in the master brake cylinder with brake clearance automatic eliminating function of the present invention;
In figure: 1. acceleration pedal, 2. brake pedal, 3. motor-driven mechanism, 4. master brake cylinder, 5. accelerator pedal position sensor, 6. brake pedal position sensor, 7. connecting rod, 8. gear, 9. drive motor, 10. master brake cylinder push rod, braking liquid inlet after 11., braking liquid inlet before 12., 13. master brake cylinder first chambeies, 14. master brake cylinder second chambeies, 15. pressure sensors, 16. drive motor control modules, 17. hydraulic electric control unit, revolver before 18., 19. rear right wheels, 20. front right wheels, revolver after 21., revolver drg before 22., 23. rear right wheel drgs, 24. front right wheel drgs, revolver drg after 25., 26. brake wheel cylinders, 27. friction shoes, 28. brake discs, 29. microcontrollers, 30.CAN transponder chip, 31. motor drive ics,
Solid line in Fig. 1, Fig. 2 between parts represents hydraulic pipe route, represented by dotted arrows electric signal route.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is explained in detail:
Brake system effect hysteresis quality refers to brake response time, and brake response time starts action with brake pedal and evaluates to the time reached needed for given brake efficiency.Stopping distance refers to that chaufeur starts to brake the distance that crosses of automobile stopping automobile.
The hysteresis quality of described brake system effect mainly comes the gap of automatic brake system, and the gap of brake system is mainly from the idle travel of brake pedal, the idle travel of master brake cylinder push rod and the gap between friction shoe and brake disc.
The described elimination to brake system gap, judge according to the pressure size in pipeline, when pipeline inner pressure reaches a certain value, then think that the gap of brake system is eliminated, brake system starts to produce braking force.
Consult Fig. 1 and Fig. 2, the master brake cylinder with brake clearance automatic eliminating function of the present invention includes hydraulic brake subsystem and motor drive system.
Of the present inventionly comprise brake pedal 2, connecting rod 7, master brake cylinder 4, hydraulic electric control unit 17, front revolver drg 22, rear right wheel drg 23, front right wheel drg 24 and rear revolver drg 25 with the hydraulic brake subsystem in the master brake cylinder of brake clearance automatic eliminating function.
Front revolver drg 22 of the present invention, rear right wheel drg 23, front right wheel drg 24 are identical with rear revolver drg 25 structure, all adopt same drg, can select traditional plate disc brake.Each drg all comprises brake wheel cylinder 26, friction shoe 27 and brake disc 28.Described hydraulic electric control unit 17 is the pressure distribution device in Conventional braking systems, such as anti-blocking brake system and EBD (Electric Brakeforce Distribution) etc., for there is sale in market, and the matured product that automobile has been equipped, the 9th generation ABS of such as Bosch.Described master brake cylinder 4 separates for ante-chamber and back cavity two chambeies with piston.Described brake pedal 2 and acceleration pedal 1 are electronic pedal, are judged the position of pedal by Voltage force signal.Described brake pedal position sensor 6 is used for detecting the position signal of brake pedal 2, described accelerator pedal position sensor 5 is used for detecting the position signal of acceleration pedal 1, accelerator pedal position sensor 5 and brake pedal position sensor 6 can adopt existing matured product on market, the efp/brake pedal position sensor of such as Heng Run scientific & technical corporation, the YTC065 pedal position sensor etc. of Zhejiang Qing Yuan company.
The a mouth of described hydraulic electric control unit 17 is connected with the oil inlet and outlet pipeline in master brake cylinder second chamber 14 of master brake cylinder 4, the b mouth of hydraulic electric control unit 17 is connected with the oil inlet and outlet pipeline in master brake cylinder first chamber 13 of master brake cylinder 4, the c mouth of hydraulic electric control unit 17 is connected with the oil inlet and outlet pipeline of front revolver drg 22, rear right wheel drg 23, and the d mouth of hydraulic electric control unit 17 is connected with the oil inlet and outlet pipeline of front right wheel drg 24, rear revolver drg 25.The connecting line in the b mouth of hydraulic electric control unit 17 and master brake cylinder first chamber 13 of master brake cylinder 4 is provided with pressure sensor 15, be used for the pressure of signal piping, pressure sensor 15 can adopt existing matured product on market, the QSY8116 piezoelectric pressure indicator of such as Qi Shi edge company.
Consult Fig. 2, the hydraulic brake circuit of the hydraulic brake subsystem of the master brake cylinder with brake clearance automatic eliminating function of the present invention is: the oil inlet and outlet in master brake cylinder first chamber 13 is connected with the b port tube of hydraulic electric control unit 17, the oil inlet and outlet in master brake cylinder second chamber 14 is connected with a port tube of hydraulic electric control unit 17, the c mouth of hydraulic electric control unit 17 is connected with the oil inlet and outlet pipeline of front revolver drg 22, rear right wheel drg 23, and the d mouth of hydraulic electric control unit 17 is connected with the oil inlet and outlet pipeline of front right wheel drg 24, rear revolver drg 25.
The annexation of the braking force control system of the hydraulic brake subsystem of the master brake cylinder with brake clearance automatic eliminating function of the present invention is: brake pedal 2 carries out hinged with one end of connecting rod 7, the other end of connecting rod and one (right side) of master brake cylinder push rod 10 hold carry out hinged.
Consult Fig. 1 and Fig. 2, the principle of work of the hydraulic brake subsystem of the described master brake cylinder with brake clearance automatic eliminating function is: after chaufeur steps on brake pedal 2, brake pedal 2 promotes master brake cylinder push rod 10 by connecting rod 7 and moves, braking liquid enters brake piping by master brake cylinder first chamber 13 of front braking liquid inlet 12 and rear braking liquid inlet 11 approach master brake cylinder 4 and master brake cylinder second chamber 14, again by hydraulic electric control unit 17, braking liquid is transported to front revolver drg 22 by brake piping, rear right wheel drg 23, front right wheel drg 24 and rear revolver drg 25.After arriving each drg, braking liquid promotes friction shoe 27 motion by brake wheel cylinder 26 and carries out contact friction with brake disc 28, thus produces braking force, makes vehicle carry out slowing down or stopping.
Consult Fig. 1 and Fig. 2, described comprises motor-driven mechanism 3, accelerator pedal position sensor 5, brake pedal position sensor 6, pressure sensor 15 and drive motor control module 16 with the motor drive system in the master brake cylinder of brake clearance automatic eliminating function.
Described drive motor control module 16, in order to realize controlling the rotation displacement of drive motor, can adopt its function of chip microcontroller.
Described hydraulic electric control unit 17 is connected with drive motor control module 16 electric wire, drive motor control module 16 is connected with pressure sensor 15 electric wire, drive motor control module 16 is connected with drive motor 9 electric wire, drive motor control module 16 is connected with accelerator pedal position sensor 5 electric wire, and drive motor control module 16 is connected with brake pedal position sensor 6 electric wire.
Described motor-driven mechanism 3 comprises gear 8 and drive motor 9.Gear 8 is arranged on the output shaft of drive motor 9, the i.e. rotor coaxial of gear 8 and drive motor 9, and adopt bearing pin that gear 8 is fixedly connected with the output shaft of drive motor 9, gear 8 is arranged in immediately below the master brake cylinder push rod 10 of hydraulic brake subsystem, and the rotation axis of gear 8 is space crossed vertical with the rotation axis of master brake cylinder push rod 10.Described drive motor 9 can adopt asynchronous motor, permanent magnet brushless electromotor, stepping motor etc.
The electronic pedal that described acceleration pedal 1 and brake pedal 2 all adopt Current vehicle extensively to adopt, can judge pedal position by potential change.Described accelerator pedal position sensor 5 is arranged on the back side of acceleration pedal 1, in order to gather the potential change of acceleration pedal 1, and the potential value collected is sent to drive motor control module 16, in order to calculate position and the change in location of acceleration pedal 1.Described brake pedal position sensor 6 is arranged on the back side of brake pedal 2, in order to gather the potential change of brake pedal 2, and the potential value collected is sent to drive motor control module 16, in order to calculate position and the change in location of brake pedal 2.
Described pressure sensor 15 is arranged on a hydraulic tubing between master brake cylinder 4 and hydraulic electric control unit 17, in order to detect the hydraulic fluid pressure size of brake piping.
The electric potential signal that described accelerator pedal position sensor 5 and brake pedal position sensor 6 can will speed up pedal 1 and brake pedal 2 sends to drive motor control module 16, drive motor control module 16 can calculate the change in location of acceleration pedal 1 and brake pedal 2, the speed of change in location by the electric potential signal gathered, and amount of force when can judge that now chaufeur tramples brake pedal 2 by the acceleration/accel of brake pedal 2 change in displacement.
Consult Fig. 4, drive motor control module 16 comprises microcontroller 29, CAN transceiver chip 30 and motor drive ic 31.In figure, the Vcc pin of each device represents power interface, and GND pin represents ground connection, and drive motor 9 adopts stepping motor.
Microcontroller 29 is core controllers of drive motor control module 16, the model of employing Infineon company is the chip (XC878) of SAK-XC878-16FFA, model is that the chip package of SAK-XC878-16FFA has 64 pins, only indicates the part pin of needs in figure; CAN transceiver chip 30 adopts the model of Infineon company to be the chip of TLE6251GS, in order to realize the transmission-receiving function of CAN message; Motor drive ic 31 adopts the model of ST Microelectronics to be the chip of L298N, in order to realize the driving to stepping motor.
The pin P1.1 of microcontroller 29 is connected with the c2 pin of CAN transceiver chip 30, the pin P1.4 of microcontroller 29 is connected with the c1 pin of CAN transceiver chip 30, fetches by the connected of two pins the function realizing microcontroller 29 transceiving communication data; The pin AN1 of microcontroller 29 is connected with the interface o of accelerator pedal position sensor 5, and the electric potential signal being used for gathering acceleration pedal 1 changes; The pin AN2 of microcontroller 29 is connected with the interface p of brake pedal position sensor 6, and the electric potential signal being used for gathering brake pedal 2 changes; The pin AN3 of microcontroller 29 is connected with the interface q of pressure sensor 15, is used for gathering the signal of pressure sensor 15, thus is used for calculating hydraulic tubing force value now; Pin P3.1, the pin P3.2 of microcontroller 29, pin P3.3 and pin P3.4 are connected with pin d4 with pin d1, the pin d2 of motor drive ic 31, pin d3 successively, are used for sending instruction from microcontroller 29 to motor drive ic 31.The pin c6 of CAN transceiver chip 30 is connected with interface a2 with the interface a1 of hydraulic electric control unit 17 successively with pin c7, is used for realizing the CAN communication between drive motor control module 16 and hydraulic electric control unit 17.Pin d5, the pin d6 of motor drive ic 31, pin d7 and pin d8 are connected with interface m4 with interface m1, the interface m2 of drive motor 9, interface m3 successively, are used for realizing the control to drive motor 9.
The control policy of described drive motor control module 16 is as follows:
Microcontroller 29 receives the signal from accelerator pedal position sensor 5, brake pedal position sensor 6, judges whether to need drive motor 9 to carry out the automatic elimination of brake clearance by calculating; When judging to need to start drive motor 9, microcontroller 29 sends instruction by pin P3.1, pin P3.2, pin P3.3 and pin P3.4 to motor drive ic 31, and motor drive ic 31 drives drive motor 9 to operate; Pressure sensor 15 sends signal to microcontroller 29, microcontroller 29 can calculate the pressure size in now hydraulic tubing, when meeting stop condition, microcontroller 29 sends halt instruction to motor drive ic 31, and motor drive ic 31 controls motor 9 and shuts down; Microcontroller 29 carries out data communication by CAN transceiver chip 30 and hydraulic electric control unit 17, receives and sends relevant data communication.
Consult Fig. 2, master brake cylinder push rod 10 is cylindrical straight-bar class formation part, left section of master brake cylinder push rod 10 is cylindrical polished rod section, right section of master brake cylinder push rod 10 is processed with the tooth be meshed with gear 8, namely right section of master brake cylinder push rod 10 has tooth section for columniform, the rotation of gear 8 can be changed into the translation of master brake cylinder push rod 10.Gear 8 meets national standard with the tooth on master brake cylinder push rod 10.
Consult Fig. 3, the cross section of master brake cylinder push rod 10 is circular, and right-hand member processes the meshing relation of master brake cylinder push rod 10 and gear 8 after tooth as shown in FIG..
Described requires as follows with master brake cylinder push rod 10 demand fulfillment in the master brake cylinder of brake clearance automatic eliminating function:
1. consult Fig. 2, because master brake cylinder push rod 10 needs to promote the motion of master brake cylinder 4 inner carrier, so master brake cylinder push rod 10 there is the high order end of tooth section should be greater than the maximum functional stroke of master brake cylinder push rod 10 to the distance of master brake cylinder 4 cylinder body low order end.
2. move, so the length of tooth section that has of master brake cylinder push rod 10 also should be greater than the maximum functional stroke of master brake cylinder push rod 10 because gear 8 needs to promote master brake cylinder push rod 10.
3., based on the consideration of the aspects such as safety, component strength and job requirement, the diameter of section of tooth section that has of master brake cylinder push rod 10 will enough greatly, and the master brake cylinder push rod 10 of some models is meticulous.Time meticulous, need master brake cylinder push rod 10 overstriking, only need will have the overstriking of tooth section.
4. will there be enough spaces in the surrounding of master brake cylinder push rod 10 to install drive motor 9.
5. after installing motor-driven mechanism 3 additional, there is certain requirement to the length of master brake cylinder push rod 10, during curtailment, need master brake cylinder push rod 10 to do corresponding prolongation.
Having in tooth section holder housing of described drive motor 9, gear 8 and master brake cylinder push rod 10, housing and vehicle body connect firmly, thus the position of motor-driven mechanism 3 can be fixed.
The described control policy with the motor drive system in the master brake cylinder of brake clearance automatic eliminating function is: the signal that accelerator pedal position sensor 5 and brake pedal position sensor 6 can will speed up pedal 1 and brake pedal 2 sends to drive motor control module 16, and drive motor control module 16 can drive drive motor 9 the need of rotation according to condition.When needs drive drive motor 9 carry out rotating thus promote master brake cylinder push rod 10, can judge by the signal feedback of pressure sensor 15 size producing pressure, thus determine whether to need to drive drive motor 9 stop motion.When drive motor 9 rotates, gear 8 can promote master brake cylinder push rod 10 to carry out moving thus producing pressure, promotes friction shoe 27 contact with brake disc 28 by brake wheel cylinder 26, reaches the object eliminating brake clearance.
The specific works process of the master brake cylinder with brake clearance automatic eliminating function of the present invention is as follows:
1. during running car, the potential change that accelerator pedal position sensor 5 and brake pedal position sensor 6 can will speed up pedal 1 and brake pedal 2 sends to drive motor control module 16, and drive motor control module 16 can calculate the change in location of acceleration pedal 1 and brake pedal 2 and the speed of change in location accordingly.
2., when not having bend the throttle 1 and brake pedal 2, the stroke of acceleration pedal 1 and brake pedal 2 is 0.The threshold value Sa of setting acceleration pedal 1 stroke, during chaufeur release the gas pedal 1, when stroke is less than threshold value Sa, thinks that chaufeur release the gas pedal 1 stopping is accelerated, otherwise thinks that chaufeur just accelerates at step on the accelerator 1.When chaufeur release the gas pedal 1, drive motor control module 16 can calculate change in location and the rate of change of now acceleration pedal 1, when rate of change is greater than a certain value, think that now chaufeur has the tendency of emergency braking, drive motor control module 16 controls drive motor 9 and rotates, move to promote master brake cylinder push rod 10, eliminate brake clearance.Now the force value of pipeline can be fed back to drive motor control module 16 by pressure sensor 15, and drive motor control module 16 can judge whether to need drive motor 9 to stop operating according to force value.
3. when automobile is run at high speed, when the speed of a motor vehicle is higher than a certain numerical value, as long as chaufeur release the gas pedal 1, the trend of emergency braking whether is had regardless of chaufeur, drive motor control module 16 all can control drive motor 9 and rotate, and promotes master brake cylinder push rod 10 and carries out moving to eliminate brake clearance.
4. remove chaufeur to have outside the trend of emergency braking and the too high two kinds of situations of the speed of a motor vehicle, in all the other situations, after chaufeur release the gas pedal 1, motor drive system can not carry out the automatic elimination of brake clearance.
5., when chaufeur tramples brake pedal 2, the potential change of brake pedal 2 can be sent to drive motor control module 16 by brake pedal position sensor 6, and drive motor control module 16 can calculate the now change in location of brake pedal 2 and the speed of change in location.If now the change in location of brake pedal 2 is very fast, when rate of change is greater than a certain numerical value, then think that chaufeur carries out emergency braking, if previous stage, motor drive system did not have action automatically to eliminate gap, then drive motor control module 16 can control drive motor 9 and carries out moving to eliminate brake clearance; If previous stage, motor drive system eliminated brake clearance, then motor drive system no longer action.
6. by the potential change of brake pedal 2, drive motor control module 16 can judge that now chaufeur tramples the size of brake pedal force, if judge now chaufeur energetically trample brake pedal 2, then think that braking is very urgent, drive motor control module 16 can control drive motor 9 and rotate, omnidistance driver assistance is braked, thus can shorten stopping distance.
When motor drive system is failure to actuate, chaufeur is stepped on brake pedal 2 and can be braked normally, and the rotor of drive motor 9 is free to rotate, and can not affect normal braking, and chaufeur also can not be made to feel difference.
Consult Fig. 4 to Fig. 6, represent in Fig. 4 in technical scheme of the present invention and adopt stepping motor as drive motor 9, when adopting other motors as drive motor 9, drive motor control module 16 is also similar with it, only motor drive ic 31 need be changed into the driving chip being applicable to drive corresponding motor, remainder without the need to replacing, specifically as shown in Fig. 4 and Fig. 6.Fig. 5 represents that use permanent magnet brushless electromotor forms as the structure of drive motor control module 16 during drive motor 9; Fig. 6 represents that employing asynchronous motor forms as the structure of drive motor control module 16 during drive motor 9.
Consult Fig. 5, when using permanent magnet brushless electromotor as drive motor 9, adopt Texas Instruments produce model be the chip of DRV8312 as motor drive ic 31, model is that the chip package of DRV8312 has 36 pins, only indicates the pin used in figure.Permanent magnetic brushless adopts pwm signal to control, pin P4.1, the pin P4.2 of microcontroller 29, pin P4.3, pin P4.4, pin P4.5 and pin P4.6 are pin d1, the pin d2 of the chip of DRV8312 successively with model, pin d3, pin d4, pin d5 are connected with pin d6, are used for being that the chip (motor drive ic 31) of DRV8312 sends instruction from microcontroller 29 to model; Model is that pin d7, the pin d8 of the chip (motor drive ic 31) of DRV8312 is connected with interface m3 with interface m1, the interface m2 of permanent magnetic brushless (drive motor 9) successively with pin d9, in order to realize the control to permanent magnetic brushless (drive motor 9).
Consult Fig. 6, when using asynchronous motor as drive motor 9, adopt the model of Infineon company be the chip of TLE5205 as motor drive ic 31, model is the chip of TLE5205 is the motor drive ic having 7 pin package, built-in full-bridge to drive.Pin P3.1 and the pin P3.2 of microcontroller 29 are that the pin IN1 of the chip (motor drive ic 31) of TLE5205 is connected with pin IN2 successively with model, are used for being that the chip (motor drive ic 31) of TLE5205 sends instruction from microcontroller 29 to model; Model is that the pin OUT1 of the chip (motor drive ic 31) of TLE5205 is connected with interface m2 with the interface m1 of asynchronous motor successively with pin OUT2, in order to realize the control to asynchronous motor (drive motor 9).
The motor drive system of the master brake cylinder with brake clearance automatic eliminating function in the present invention also can as the replacement device of the vacuum booster in existing hydraulic brake system, for chaufeur provides electronics power-assisted, electric machine control precision can be given full play to high, the advantages such as response time is fast.
When thrashing, chaufeur can be braked normally, and motor drive system can not have an impact to braking.
In addition, the alarm device for the master brake cylinder with brake clearance automatic eliminating function can also be set, give the alarm when breaking down with the master brake cylinder of brake clearance automatic eliminating function in order to checkout and diagnosis.
When being applied in the brake system being provided with the work-saving devices such as vacuum booster, described with the sequence of erection of primary member in the master brake cylinder of brake clearance automatic eliminating function is: brake pedal 2-connecting rod 7-motor-driven mechanism 3-work-saving device-master brake cylinder 4.
Above detailed description of the invention is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to concrete embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of the present invention program, it all should be encompassed in the middle of right of the present invention.
Claims (8)
1. with a master brake cylinder for brake clearance automatic eliminating function, comprise hydraulic brake subsystem, it is characterized in that, the described master brake cylinder with brake clearance automatic eliminating function also includes motor drive system;
Described motor drive system comprises motor-driven mechanism (3), accelerator pedal position sensor (5), brake pedal position sensor (6), pressure sensor (15) and drive motor control module (16);
Described drive motor control module (16) is connected with pressure sensor (15) electric wire, drive motor control module (16) is connected with brake pedal position sensor (6) electric wire, drive motor control module (16) is connected with accelerator pedal position sensor (5) electric wire, drive motor control module (16) is connected with drive motor (9) electric wire, drive motor control module (16) is connected with hydraulic electric control unit (17) electric wire in hydraulic brake subsystem, gear (8) in motor-driven mechanism (3) is connected with a joggle with the master brake cylinder push rod (10) in hydraulic brake subsystem.
2. according to the master brake cylinder with brake clearance automatic eliminating function according to claim 1, it is characterized in that, described drive motor control module (16) comprises microcontroller (29), CAN transceiver chip (30) and motor drive ic (31);
Microcontroller (29) adopts model to be the chip of SAK-XC878-16FFA; CAN transceiver chip (30) adopts model to be the chip of TLE6251GS; Motor drive ic (31) adopts model to be the chip of L298N;
The pin P1.1 of microcontroller (29) is connected with the c2 pin of CAN transceiver chip (30), and the pin P1.4 of microcontroller (29) is connected with the c1 pin of CAN transceiver chip (30); Pin P3.1, the pin P3.2 of microcontroller (29), pin P3.3 and pin P3.4 are connected with d4 pin with the d1 pin of motor drive ic (31), d2 pin, d3 pin successively.
3. according to the master brake cylinder with brake clearance automatic eliminating function according to claim 1, it is characterized in that, described drive motor control module (16) is connected with pressure sensor (15) electric wire, drive motor control module (16) is connected with brake pedal position sensor (6) electric wire, drive motor control module (16) is connected with accelerator pedal position sensor (5) electric wire, drive motor control module (16) is connected with drive motor (9) electric wire, drive motor control module (16) is connected with hydraulic electric control unit (17) electric wire in hydraulic brake subsystem and refers to:
The pin AN3 of microcontroller (29) is connected with the interface q of pressure sensor (15); The pin AN2 of microcontroller (29) is connected with the interface p of brake pedal position sensor (6); The pin AN1 of microcontroller (29) is connected with the interface o of accelerator pedal position sensor (5); Pin d5, the pin d6 of motor drive ic (31), pin d7 and pin d8 are connected with interface m4 with interface m1, the interface m2 of drive motor (9), interface m3 successively, and the pin c6 of CAN transceiver chip (30) is connected with interface a2 with the interface a1 of hydraulic electric control unit (17) successively with pin c7.
4. according to the master brake cylinder with brake clearance automatic eliminating function according to claim 1, it is characterized in that, described motor-driven mechanism (3) also includes drive motor (9);
Gear (8) is arranged on the output shaft of drive motor (9), and adopt bearing pin that gear (8) is fixedly connected with the output shaft of drive motor (9), gear (8) is arranged in immediately below the master brake cylinder push rod (10) of hydraulic brake subsystem, and the rotation axis of gear (8) is space crossed vertical with the rotation axis of master brake cylinder push rod (10); Described drive motor (9) adopts stepping motor, permanent magnet brushless electromotor or asynchronous motor.
5. according to the master brake cylinder with brake clearance automatic eliminating function according to claim 4, it is characterized in that, motor drive ic (31) when described drive motor (9) adopts permanent magnet brushless electromotor in drive motor control module (16) adopts model to be the chip of DRV8312, the pin P4.1 of the microcontroller (29) in drive motor control module (16), pin P4.2, pin P4.3, pin P4.4, pin P4.5 and pin P4.6 is the pin d1 of the chip of DRV8312 successively with model, pin d2, pin d3, pin d4, pin d5 is connected with pin d6, model is the pin d7 of the chip of DRV8312, pin d8 and pin d9 successively with the interface m1 of permanent magnetic brushless, interface m2 is connected with interface m3.
6. according to the master brake cylinder with brake clearance automatic eliminating function according to claim 4, it is characterized in that, motor drive ic (31) when described drive motor (9) adopts asynchronous motor in drive motor control module (16) adopts model to be the chip of TLE5205, pin P3.1 and the pin P3.2 of the microcontroller (29) in drive motor control module (16) are that the pin IN1 of the chip of TLE5205 is connected with pin IN2 successively with model, model is that the pin OUT1 of the chip of TLE5205 is connected with interface m2 with the interface m1 of asynchronous motor successively with pin OUT2.
7. according to the master brake cylinder with brake clearance automatic eliminating function according to claim 1, it is characterized in that, described hydraulic brake subsystem also comprises brake pedal (2), connecting rod (7), master brake cylinder (4), hydraulic electric control unit (17), front revolver drg (22), rear right wheel drg (23), front right wheel drg (24) and rear revolver drg (25);
Brake pedal (2) is hinged with the right-hand member of connecting rod (7), the right-hand member of the master brake cylinder push rod (10) in the left end of connecting rod (7) and master brake cylinder (4) is hinged, the oil inlet and outlet in master brake cylinder second chamber (14) of master brake cylinder (4) is connected with a mouth pipeline of hydraulic electric control unit (17), the oil inlet and outlet in master brake cylinder first chamber (13) of master brake cylinder (4) is connected with the b mouth pipeline of hydraulic electric control unit (17), the c mouth of hydraulic electric control unit (17) is connected with the oil inlet and outlet pipeline of rear right wheel drg (23) with front revolver drg (22), the d mouth of hydraulic electric control unit (17) is connected with the oil inlet and outlet pipeline of front right wheel drg (24) with rear revolver drg (25).
8. according to the master brake cylinder with brake clearance automatic eliminating function according to claim 7, it is characterized in that, described master brake cylinder push rod (10) is cylindrical straight-bar class formation part, left section of master brake cylinder push rod (10) is cylindrical polished rod section, right section of master brake cylinder push rod (10) is processed with the tooth be meshed with gear (8), namely right section of master brake cylinder push rod (10) has tooth section for columniform, master brake cylinder push rod (10) structure to meet: the high order end of tooth section that has on master brake cylinder push rod (10) should be greater than the maximum functional stroke of master brake cylinder push rod (10) to the distance of the cylinder body low order end of master brake cylinder (4), the length of tooth section that has of master brake cylinder push rod (10) also should be greater than the maximum functional stroke of master brake cylinder push rod (10).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410557619.2A CN104290737A (en) | 2014-10-19 | 2014-10-19 | Brake master cylinder with function of automatic removal of brake clearance |
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| CN201410557619.2A CN104290737A (en) | 2014-10-19 | 2014-10-19 | Brake master cylinder with function of automatic removal of brake clearance |
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| CN104290737A true CN104290737A (en) | 2015-01-21 |
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| CN201410557619.2A Pending CN104290737A (en) | 2014-10-19 | 2014-10-19 | Brake master cylinder with function of automatic removal of brake clearance |
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Cited By (6)
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| CN106143459A (en) * | 2016-08-08 | 2016-11-23 | 合肥泰好乐电子科技有限公司 | A kind of electric controlled brake system of autonomous driving vehicle |
| CN106828466A (en) * | 2017-02-28 | 2017-06-13 | 安徽江淮汽车集团股份有限公司 | A kind of pure electric vehicle power-assisted braking arrangement and braking method |
| CN107796343A (en) * | 2017-11-17 | 2018-03-13 | 杭州航验环境技术有限公司 | A kind of high-precision positioner and high accuracy positioning householder method |
| CN112339732A (en) * | 2020-09-07 | 2021-02-09 | 上海熙众新能源技术有限公司 | Braking system and braking method thereof |
| CN113928285A (en) * | 2021-09-30 | 2022-01-14 | 浙江吉利控股集团有限公司 | Method for reducing drag torque of brake |
| CN107796343B (en) * | 2017-11-17 | 2024-05-10 | 杭州航验环境技术有限公司 | High-precision positioning device and high-precision positioning auxiliary method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107796343A (en) * | 2017-11-17 | 2018-03-13 | 杭州航验环境技术有限公司 | A kind of high-precision positioner and high accuracy positioning householder method |
| CN107796343B (en) * | 2017-11-17 | 2024-05-10 | 杭州航验环境技术有限公司 | High-precision positioning device and high-precision positioning auxiliary method |
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| CN113928285A (en) * | 2021-09-30 | 2022-01-14 | 浙江吉利控股集团有限公司 | Method for reducing drag torque of brake |
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