CN103231705B - Brake pedal feel flexibly settable electro-hydraulic composite braking system - Google Patents
Brake pedal feel flexibly settable electro-hydraulic composite braking system Download PDFInfo
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- CN103231705B CN103231705B CN201310169466.XA CN201310169466A CN103231705B CN 103231705 B CN103231705 B CN 103231705B CN 201310169466 A CN201310169466 A CN 201310169466A CN 103231705 B CN103231705 B CN 103231705B
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Abstract
The invention relates to a brake pedal feel flexibly settable electro-hydraulic composite braking system which comprises a hydraulic braking subsystem (1). The hydraulic braking subsystem (1) is formed by an integrated braking main cylinder assembly (10) and a hydraulic control unit (30). The brake pedal feel flexibly settable electro-hydraulic composite braking system also comprises a composite braking control unit RBS (Regenerative Braking System) and a motor regenerative braking subsystem (3). The hydraulic braking subsystem (1), the composite braking control unit RBS and the motor regenerative braking subsystem (3) are sequentially connected. Compared with the prior art, the brake pedal feel flexibly settable electro-hydraulic composite braking system has the advantages of being compact in structure and simple to achieve and enabling pedal force and displacement stroke characteristics to be flexibly adjusted with signals of a pedal feel hydraulic sensor and a pedal displacement sensor as feedback by changing brake pedal feel to simulate pulse width modulation of an electromagnetic valve according to different target vehicles and audiences.
Description
Technical field
The present invention relates to a kind of brake system of car, especially relate to a kind of Electro-hydraulic brake system that can set brake pedal feel flexibly.
Background technology
Pure electronic, the new-energy automobile dynamic assembly such as hybrid power and fuel cell electric vehicle all with electrical motor-storage battery for core constitutes electric propulsion system, when car brakeing, electrical motor is with generation mode work and be battery charge, namely possesses braking energy recovering function.Originally with the energy of thermal dissipation when adopting regenerative braking effectively can reclaim car brakeing, improve energy utilization efficiency, the fuel consumption and emission performance of new-energy automobile.Because electromotor feedback braking torque is subject to motor total external characteristics and the restriction of battery charge characteristic, when higher adhesion value road surface or high speed emergency braking, car brakeing demand cannot be met.Brake with mechanical friction the Electro-hydraulic brake system combining and form, both advantages can be given full play to.Electro-hydraulic brake system not only improves speed of response and the control accuracy of car load brake system, is conducive to ensureing car brakeing safety, also reduces frequency of utilization and the intensity of mechanical braking friction lining, extends the service life of mechanical braking sytem.
In regeneration brake system, owing to there is motor braking power, the change of hydraulic braking force can be affected, affect the relation of original treadle effort and pedal stroke, also the identification of chaufeur braking intention can be affected, brake system can not be supplied to the good brake pedal feel of chaufeur, the safety of impact braking.In order to realize the good feel of brake pedal, need to install brake pedal travel simulator additional in regeneration brake system, the nonlinear relationship of brake-pedal travel and brake pedal force in simulation Conventional braking systems, i.e. brake pedal feel.Brake pedal feel is one of Electro-hydraulic brake system core content, it is directly connected to car brakeing safety and driving comfort, therefore according to different target vehicle and audient crowd, design and can realize different treadle efforts and pedal stroke characteristic, the integrated form brake master cylinder assembly adjusting brake pedal feel is neatly most important.
Electro-hydraulic brake Braking system energy regenerating ability and control policy formulate the main impact being subject to electric system and hydraulic control system, and wherein, electric system is subject to motor total external characteristics and battery charge power restriction.Along with research drops into and technical development, be applied to motor and storage battery type selecting, coupling and control technology relative maturity in the power assembly system of Electro-hydraulic brake, the hydraulic brake system meeting the demand will become the Focal point and difficult point of Electro-hydraulic brake system.
Mostly abroad carried out transforming and upgrading on its existing brake system basis by car production manufacturer and brake safe components supplying business, and be used successfully to new-energy automobile, as Toyota develop on electronic stability program VSC basis can with the electrically controlled brake system ECB of hydraulic braking cooperation control, be successfully applied to Prius vehicle, and regenerate and improvement of constantly upgrading with Prius vehicle; Honda develops the integral type master brake cylinder possessing brake pedal feel simulation and master cylinder pressure regulatory function, wherein, brake pedal feel simulator is made up of cylindrical rubber and spring, pressure adjusting function is made up of high-voltage power supply, control cock and 4 electromagnetic valves etc., has been applied to hybrid electric vehicle Civic Hybrid; TRW is based on the standard electronic stabilizing control system ESC of maturation, make full use of vacuum booster and the ESC assembly of standard, be proposed the sure brake system ESC-R possessing braking energy recovering function, this system is applicable to the vehicle different driving forms such as forerunner, rear-guard and 4 wheel driven.
Said system is modified on Conventional braking systems architecture basics, to meet Electro-hydraulic brake system requirements, is applied to new-energy automobile.But in such scheme, after some improvement, structure is comparatively complicated, high to manufacture process requirement; Some system requirements control logics are complicated, realize cost higher; The still reservation vacuum booster had, but need additionally to increase vacuum pump.
Summary of the invention
Object of the present invention is exactly provide a kind of and possess active and passive hydraulic booster in order to overcome defect that above-mentioned prior art exists and can adjust the Electro-hydraulic brake system of brake pedal feel flexibly, and this system can adapt to different automobile types and audient crowd.
Object of the present invention can be achieved through the following technical solutions:
A kind of Electro-hydraulic brake system that can set brake pedal feel flexibly, comprise hydraulic brake subsystem, described hydraulic brake subsystem is made up of integrated form brake master cylinder assembly and hydraulic control unit, it is characterized in that, described Electro-hydraulic brake system also comprises composite brakig control unit RBS and motor regenerative braking subsystem, and described hydraulic brake subsystem, composite brakig control unit RBS are connected successively with motor regenerative braking subsystem;
Described integrated form brake master cylinder assembly is made up of integrated form master brake cylinder and high pressure fuel source, and described integrated form master brake cylinder comprises oil cabinet, pedal sense simulates oil-feed electromagnetic valve, pedal sense simulates solenoid, pedal sense hydraulic pressure transducer and housing assembly;
Described pedal sense simulation oil-feed electromagnetic valve one end simulates solenoid one end with pedal sense and is connected, described pedal sense hydraulic pressure transducer and housing assembly are connected on pedal sense simulation oil-feed electromagnetic valve respectively and pedal sense simulates between solenoid, the other end of described pedal sense simulation oil-feed electromagnetic valve is connected with high pressure fuel source, and the other end that described pedal sense simulates solenoid is connected with oil cabinet.
Described pedal sense simulation oil-feed electromagnetic valve and pedal sense simulate solenoid and are normally-off electromagnetic valve.
Described housing assembly comprises brake pedal, pedal displacement sensor, cylinder body and is arranged on master brake cylinder push rod, boosting piston, master cylinder first piston, master cylinder first pull back spring, master cylinder second piston, master cylinder second pull back spring in cylinder body;
Described cylinder body is provided with the first through hole, the second through hole, third through-hole, fourth hole, fifth hole, the 6th through hole and the 7th through hole;
Described brake pedal and pedal displacement sensor are arranged on master brake cylinder push rod;
Described master brake cylinder push rod and boosting piston form pedal sense and simulate and passive power-assisted Compound Cavity in cylinder body, this pedal sense simulation and passive power-assisted Compound Cavity be connected with oil cabinet by the first through hole on cylinder body, and simulate oil-feed electromagnetic valve with pedal sense respectively by the second through hole, pedal sense simulates solenoid and pedal sense hydraulic pressure transducer is connected;
Described boosting piston and master cylinder first piston form initiatively power-assisted chamber in cylinder body, and this is initiatively connected with high pressure fuel source and oil cabinet by the third through-hole on cylinder body in power-assisted chamber respectively;
Described master cylinder first piston and master cylinder second piston form master cylinder back cavity in cylinder body, this master cylinder back cavity is connected with oil cabinet by the fourth hole on cylinder body, and be connected with hydraulic control unit by fifth hole, the first described pull back spring two ends are separately fixed on the end face of master cylinder first piston and master cylinder second piston;
Described master cylinder second piston and the sidewall of cylinder body form master cylinder ante-chamber, this master cylinder ante-chamber is communicated with oil cabinet by the 6th through hole on cylinder body, and be connected with hydraulic control unit by the 7th through hole, the second described pull back spring two ends are separately fixed on the end face of master cylinder second piston and the sidewall of cylinder body.
Described high pressure fuel source comprises the first check valve, motor-drive pump, the second check valve, high pressure accumulator, oil pressure pressure sensor and open type switch electromagnetic valve, described third through-hole is connected with the entrance of oil pressure pressure sensor, high pressure accumulator and switch electromagnetic valve respectively, the outlet of switch electromagnetic valve connects oil cabinet, the entrance of described motor-drive pump is connected with oil cabinet by the first check valve, and electronic delivery side of pump is connected with high pressure accumulator by the second check valve.
Described hydraulic control unit is provided with two input ports and four delivery ports, each input port correspondence is provided with two delivery ports, two described input ports connect fifth hole on cylinder body and the 7th through hole respectively, four described delivery ports connect the brake wheel cylinder of four wheels respectively, form four independently controlling brancher.
Described hydraulic control unit comprises hydraulic package for controlling four brake wheel cylinders and control group, two controlling brancher that described each input port is corresponding share one group of hydraulic package, every bar controlling brancher is equipped with control group, described hydraulic package comprises check valve, Hydraulic Pump, oil return motor and low pressure accumulator, described Hydraulic Pump lays respectively at oil return motor both sides, driven by oil return motor, respectively there is a check valve both sides of described Hydraulic Pump; Described control group is made up of open type switch electromagnetic valve and normally-off switch electromagnetic valve.
The brake wheel cylinder of four described wheels is equipped with wheel speed sensors.
Described motor regenerative braking subsystem comprises the motor, electric machine controller MCU, entire car controller VMS, battery management system BMS and the battery pack that connect successively, and described entire car controller VMS is connected with composite brakig control unit RBS.
Described composite brakig control unit RBS possesses data acquisition interface, driver output interface and communication interface, described data acquisition interface respectively with pedal displacement sensor, oil pressure pressure sensor, wheel speed sensors and pedal sense hydraulic pressure transducer connect, described driver output interface and pedal sense simulate oil-feed electromagnetic valve, pedal sense simulates solenoid and is connected with the motor-drive pump in high pressure fuel source and open type switch electromagnetic valve, described communication interface at least comprises two, a communication interface is connected with entire car controller VMS, another communication interface is connected with hydraulic control unit.
This system has initial preparation state, normal working and failure state three kinds of mode of operations, described normal working comprises conventional brake master mode, ABS master mode and ASR master mode, described ABS master mode is divided into two kinds of control methods: 1) when ABS enters control, regenerative braking is exited immediately; 2) when ABS enters control, regenerative braking power participates in ABS and controls.
Compared with prior art, the present invention has the following advantages:
1, the present invention is integrated with pedal sense simulation and main passive hydraulic booster function, compares with the composite braking system of traditional vacuum force aid system with motor mechanism power-assisted, compact conformation of the present invention, flexible for installation, control accurately.
2, the present invention can according to different target vehicle type and audient crowd, solenoid modulation pulsewidth is simulated by control pedal sensation simulation oil-feed electromagnetic valve and pedal sense, realize different treadle efforts and pedal stroke characteristic, adjust brake pedal feel flexibly, ensure the conformability of Electro-hydraulic brake system brake pedal feel under different master mode.
3, the present invention possesses main passive hydraulic booster function, improves braking response speed, is conducive to accurately controlling pressure of wheel braking cylinder and improving brake efficiency.
4, the present invention possesses emergency braking function under failure state, still possesses passive hydraulic booster function, effectively ensure that brake safe under failure state.
5, the present invention adopts the hydraulic control unit of conventional ABS-system, continues to use Conventional braking systems master cylinder, and production technology is simple, cost is lower.
6, extendability and applicability good, composite brakig control unit RBS of the present invention can possessing ESP, from using the function such as to cruise, can be widely used in pure electric automobile, hybrid vehicle and fuel cell powered vehicle after expansion.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure: 1, hydraulic brake subsystem; 101, the first check valve; 102, motor-drive pump; 103, the second check valve; 104, high pressure accumulator; 105, oil pressure pressure sensor; 106, open type switch electromagnetic valve; 201, oil cabinet; 202, pedal sense simulation oil-feed electromagnetic valve; 203, pedal sense simulates solenoid; 204, pedal sense hydraulic pressure transducer; 205, housing assembly; 206, brake pedal; 207, pedal displacement sensor; 208, cylinder body; 209, master brake cylinder push rod; 210, pedal sense simulation and passive power-assisted Compound Cavity; 211, boosting piston; 212, active power-assisted chamber; 213, master cylinder first piston; 214, master cylinder back cavity; 215, master cylinder first pull back spring; 216, master cylinder second piston; 217, master cylinder ante-chamber; 218, master cylinder second pull back spring; 2-1, the first through hole; 2-2, the second through hole; 2-3, third through-hole; 2-4, fourth hole; 2-5, fifth hole; 2-6, the 6th through hole; 2-7, the 7th through hole; 30, hydraulic control unit; 301,302,303,304, check valve; 305,306, Hydraulic Pump; 307, oil return motor; 308,309, low pressure accumulator; 310,311,312,313, open type switch electromagnetic valve; 314,315,316,317, normally-off switch electromagnetic valve; 401, the near front wheel brake wheel cylinder; 402, off hind wheel brake wheel cylinder; 403, off front wheel brake wheel cylinder; 404, left rear wheel brake wheel cylinder; 405,406,407,408, wheel speed sensors; RBS, composite brakig control unit; 3, motor regenerative braking subsystem; 3-1, motor; VMS, entire car controller; MCU, electric machine controller; BMS, battery management system; 3-2, battery pack.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment
As shown in Figure 1, a kind of Electro-hydraulic brake system that can set brake pedal feel flexibly, comprise hydraulic brake subsystem 1, described hydraulic brake subsystem 1 is made up of integrated form brake master cylinder assembly 10 and hydraulic control unit 30, described Electro-hydraulic brake system also comprises composite brakig control unit RBS and motor regenerative braking subsystem 3, and described hydraulic brake subsystem 1, composite brakig control unit RBS are connected successively with motor regenerative braking subsystem 3; Described motor regenerative braking subsystem 3 is made up of motor 3-1, electric machine controller MCU, entire car controller VMS, battery management system BMS and battery pack 3-2.
Described integrated form brake master cylinder assembly 10 is made up of integrated form master brake cylinder and high pressure fuel source, and described integrated form master brake cylinder comprises oil cabinet 201, pedal sense simulates oil-feed electromagnetic valve 202, pedal sense simulates solenoid 203, pedal sense hydraulic pressure transducer 204 and housing assembly 205; Described pedal sense simulation oil-feed electromagnetic valve 202 simulates solenoid 203 with pedal sense and is connected, its intermediate connection point is connected with pedal sense hydraulic pressure transducer 204 and housing assembly 205 respectively, the other end of described pedal sense simulation oil-feed electromagnetic valve 202 is connected with high pressure fuel source, and the other end that described pedal sense simulates solenoid 203 is connected with oil cabinet 201.
Basic functional principle: composite brakig control unit RBS gathers brake pedal displacement pickup 207 and obtains driver's brake operating intention, calculates braking force needed for driver; Vehicle running state is obtained by gathering wheel speed sensors 405,406,407,408; Control motor-drive pump 102 and open type switch electromagnetic valve 106 for integrated form master brake cylinder by gathering oil pressure pressure sensor 105 initiatively hydraulic booster is provided; By CAN and motor regenerative braking subsystem 3 carry out communication obtain vehicle current maximum can regenerative braking power; According to vehicle's current condition and road condition, determine master mode, reasonable distribution electricity regenerative braking power and hydraulic braking force.Composite brakig control unit RBS is controlled each pressure of wheel braking cylinder and change thereof by CAN hydraulic control control unit 30.
Brake pedal feel simulation process comprises to be stepped on brake pedal 206 and lifts brake pedal 206 two parts, when stepping on brake pedal 206, pedal sense simulation oil-feed electromagnetic valve 202 is closed, and simulates solenoid 203 modulate pulsewidth by collection pedal sense hydraulic pressure transducer 204 and pedal displacement sensor 207 signal control pedal sense; When lifting brake pedal 206, pedal sense simulates solenoid 203 and closes, modulate pulsewidth by collection pedal sense hydraulic pressure transducer 204 and pedal displacement sensor 207 signal control pedal sense simulation oil-feed electromagnetic valve 202, ensure good treadle effort and pedal stroke characteristic in braking procedure.The present invention is according to different target vehicle and audient crowd, simulate solenoid 203 by control pedal sensation simulation oil-feed electromagnetic valve 202 and pedal sense and modulate pulsewidth, different treadle efforts and pedal stroke characteristic can be realized, adjust brake pedal feel flexibly.
Because electro-motive vehicle is generally f-w-d, thus below with the electro-motive vehicle of f-w-d for embodiment, further illustrate a kind of mode of operation of Electro-hydraulic brake system and the working process of master mode that can set brake pedal feel flexibly.
1, initial preparation state
When motor vehicle braking system does not power on, Electro-hydraulic brake system is in initial condition, now, do not step on brake pedal 206, motor-drive pump 102 does not work, and open type switch electromagnetic valve 106 is opened, and high pressure accumulator 104 does not set up high pressure, boosting piston 211, master cylinder first piston 213 and master cylinder second piston 216 are positioned at the rightmost of respective movement travel respectively under master cylinder first pull back spring 215 and the effect of master cylinder second pull back spring 218 in cylinder body, i.e. initial position; Pedal sense simulation oil-feed electromagnetic valve 202 and pedal sense simulate solenoid 203 and all close, pedal sense simulation and passive power-assisted Compound Cavity 210 are full of braking liquid, master brake cylinder push rod 209 is in pedal sense simulation and passive power-assisted Compound Cavity 210 low order end, with cylinder body 208 sidewall contact; Initiatively power-assisted chamber 212 is communicated with oil cabinet 201 by the open type switch electromagnetic valve 106 opened, master cylinder ante-chamber 217, master cylinder back cavity 214 communicate with oil cabinet 201 respectively by the 6th through hole 306 and fourth hole 304, and master cylinder ante-chamber 217, master cylinder back cavity 214 communicate with hydraulic control unit respectively by the 7th through hole 307 and fifth hole 305; Whole integrated form brake master cylinder assembly everywhere pressure is zero.
After Electro-hydraulic brake system electrification, system enters readiness, this phase duration is shorter, open type switch electromagnetic valve 106 is closed, motor-drive pump 102 extracts braking liquid from oil cabinet 201 and after the second check valve 103, pumps into high pressure accumulator 104 and active power-assisted chamber 212 after the first check valve 101, master cylinder first piston 213 and master cylinder second piston 216 move to left under the effect of active power-assisted chamber 212, close fourth hole 304 and the 6th through hole 306 respectively, master cylinder back cavity 214 and master cylinder ante-chamber 217 disconnect with oil cabinet 201, and set up high pressure; Brak control unit, by gathering oil pressure pressure sensor 105 signal, maintains the stable of high pressure accumulator 104 pressure by controlling motor-drive pump 102, for braking maneuver afterwards provides initiatively power-assisted; Pedal sense simulation oil-feed electromagnetic valve 202 and pedal sense simulate solenoid 203 and keep closing.
2, normal working
During Electro-hydraulic brake system worked well, step on brake pedal 206, master brake cylinder push rod 209 moves to left under brake pedal 206 acts on, pedal sense simulation oil-feed electromagnetic valve 202 is closed, simulate solenoid 203 by collection pedal sense hydraulic pressure transducer 204 and pedal displacement sensor 207 signal control pedal sense and modulate pulsewidth, with control feel simulation and passive power-assisted Compound Cavity 210 braking liquid discharge and pressure, owing to setting up high pressure in active power-assisted chamber 212, boosting piston 211 can not move to left, sensation simulation and passive power-assisted Compound Cavity 210 braking liquid react on master brake cylinder push rod 209, suitable brake pedal feel is provided, braking liquid flows on the right side of master brake cylinder push rod 209 and space between cylinder body 208 right side wall from oil cabinet 201 through the first through hole 301.In brake system course of normal operation, motor-drive pump 102 and high pressure accumulator 104 are constantly for the pressure adjustment of four brake wheel cylinders provides high-pressure brake liquid.In normal operation, system comprises conventional brake master mode, ABS master mode, ASR master mode and ESP pattern, composite brakig control unit RBS, according to the master mode of vehicle-state and road condition determination Electro-hydraulic brake system, sets forth these four kinds of master modes below respectively:
1) conventional brake master mode
Conventional brake master mode refers to that each parts of motor vehicle braking system normally work, and control for brake pattern when vehicle locking, understeer does not occur and turns to too much etc. trend, comprise pure hydraulic braking, pure regenerative braking and Electro-hydraulic brake three kinds of modes.
When chaufeur steps on brake pedal 206, braking intention and the braking requirement of chaufeur is explained from the output signal of pedal displacement sensor 207, entire car controller VMS obtains the vehicle engine assembly such as drive motor and electrokinetic cell information by CAN from electric machine controller MCU and battery management system BMS, the current maximum Return moment value T0 that can provide of drive motor is provided, and maximum Return moment value T0 is sent to composite brakig control unit RBS by CAN.
Composite brakig control unit RBS is according to wheel speed sensors 405, 406, 407, 408 and oil pressure pressure sensor 105, before distributing according to brake legislation, rear axle braking force is respectively M1, M2, in conjunction with the maximum Return moment value T0 that motor regenerative braking subsystem 3 is determined, the motor regenerative braking power of front axle and hydraulic braking force are distributed, obtain current motor regenerative braking power T1 and hydraulic braking force T2, current motor regenerative braking power T1 is sent to entire car controller VMS by CAN, motor regenerative braking power T1 instruction sends to electric machine controller MCU to send regenerative braking moment to control drive motor by CAN by entire car controller, front axle hydraulic braking force T2 and rear axle hydraulic braking force M2 instruction are sent to hydraulic control unit 30 by CAN by composite brakig control unit RBS.Hydraulic control unit 30 is according to front axle hydraulic braking force T2 and rear axle hydraulic braking force M2 instruction change, by controlling the open type switch electromagnetic valve 310,311,312,313 of brake wheel cylinder 401,402,403,404 branch road and normally-off switch electromagnetic valve 314,315,316,317, the supercharging of brake wheel cylinder 401,402,403,404, pressurize and decompression is realized, to reach target hydraulic braking force by pulse duration modulation.
When the speed of a motor vehicle is reduced to a certain value, drive motor rotating speed drops to a certain lower value thereupon, and the Return moment that drive motor can provide diminishes rapidly and reduces to zero (this is determined by drive motor self character).When composite brakig control unit RBS divides gas-distributing motor regenerative braking power T1 and hydraulic braking force T2, will motor regenerative braking power T1 be reduced gradually and increase hydraulic braking force T2, to meet total braking requirement.
At the end of braking procedure, pedal sense simulates solenoid 203 and closes, and modulates pulsewidth brake pedal 206 get back to initial position by collection pedal sense hydraulic pressure transducer 204 and pedal displacement sensor 207 signal control pedal sense simulation oil-feed electromagnetic valve 202 under pedal sense simulation and passive main force Compound Cavity 209 act on; Open type switch electromagnetic valve 310,311,312,313 and normally-off switch electromagnetic valve 314,315,316,317 are all closed, oil return motor 307 drives Hydraulic Pump 305,306 to work, and gets back to master cylinder back cavity 214 and master cylinder ante-chamber 217 by coming braking liquid in low pressure accumulator 308,309 in braking procedure by brake piping.
2) ABS master mode
Have wheel lockup trend when composite brakig control unit RBS monitors in braking procedure, system enters ABS master mode, and this master mode comprises two kinds of control methods:
A, when ABS enters control, regenerative braking is exited immediately
When composite brakig control unit RBS monitor need to carry out ABS control time, communication is carried out by CAN and entire car controller VMS, entire car controller VMS controls electric machine controller MCU, according to certain strategy, regenerative braking moment is kept to zero, exits braking energy feedback braking.When ABS controls to exit, composite brakig control unit RBS sends entire car controller VMS by CAN and recovers braking energy feedback braking, entire car controller VMS sends the current motor regenerative braking torque command value T1 that should be applied to wheel and sends to electric machine controller MCU, adopts the above-mentioned control method in braking energy loop control pattern to carry out regenerative braking.When ABS enters control, after regenerative braking is exited immediately, abs braking control realized by hydraulic braking force completely, specific implementation and ABS master mode similar.
B, when ABS enters control, regenerative braking power participate in ABS control
When composite brakig control unit RBS monitor need to carry out ABS control time, composite brakig control unit RBS carries out communication by CAN and entire car controller VMS, enter ABS immediately to control, entire car controller VMS notifies that electric machine controller MCU enters ABS immediately and controls, Electro-hydraulic brake control unit RBS to adjustment regenerative braking power and hydraulic braking force, realizes the overall-in-one control schema of ABS and regenerative braking according to corresponding control policy.When ABS controls to exit, composite brakig control unit RBS notifies that entire car controller VMS recovers regenerative braking, adopts the above-mentioned control method in braking energy feedback master mode to carry out regenerative braking.When ABS enters control, motor regenerative braking power and hydraulic braking force act on wheel simultaneously, complete in abs braking process, achieve the recovery of energy.
Need in ABS master mode to reduce pressure to a certain wheel pressure of wheel braking cylinder, pressurize and boost control.Suppose that locking slippage trend appears in the near front wheel 401, now, close open type switch electromagnetic valve 310, open normally-off switch electromagnetic valve 314 according to certain pulsewidth that controls, the near front wheel 401 pressure of wheel cylinder inside brake liquid is gone back low pressure accumulator 309, and brake wheel cylinder 401 pressure reduces.Pressure decrease rate realizes by the modulation pulsewidth controlling normally-off switch electromagnetic valve 314.Equally, by controlling closedown open type switch electromagnetic valve 310 and normally-off switch electromagnetic valve 314, pressurize and the supercharging of the near front wheel pressure of wheel cylinder 401 in ABS master mode can be realized.
3) ASR master mode
ASR is called that Anti-slip regulation controls, and is also called TCS.When vehicle travels on low attachment road surface, during the violent stepping on accelerator pedal of chaufeur, drive wheel can trackslip, and now enters ASR master mode.ASR master mode can by implementing braking to the wheel that trackslips thus reduce its slip level.When certain drive wheel trackslips, for the near front wheel brake wheel cylinder 401, close normally-off switch electromagnetic valve 314, open open type switch electromagnetic valve 310 according to certain modulation pulsewidth, the near front wheel pressure of wheel cylinder 401 pressure is raised, reduces slip level.Rate of pressure rise realizes by the modulation pulsewidth controlling open type switch electromagnetic valve 310.Equally, by controlling closedown open type switch electromagnetic valve 310 and normally-off switch electromagnetic valve 314, pressurize and the step-down of the near front wheel brake wheel cylinder 401 pressure in ASR master mode can be realized.
3, failure state
If when electric system lost efficacy (as unexpected power down) or high-voltage power supply can not set up high pressure (as high pressure accumulator 104 fault), Electro-hydraulic brake system of the present invention entered failure mode.Open type switch electromagnetic valve 310,311,312,313, normally-off switch electromagnetic valve 314,315,316,317 is all closed; Motor-drive pump 102 quits work, and open type switch electromagnetic valve 106 is opened, and high pressure accumulator 104 can not provide high pressure, and initiatively power-assisted chamber 212 is communicated with oil cabinet 201 by the open type switch electromagnetic valve 106 opened, and can not reoffer initiatively power-assisted; Pedal sense simulation oil-feed electromagnetic valve 202 and pedal sense simulate solenoid 203 and all close, and pedal sense simulation and passive power-assisted Compound Cavity 210 are full of braking liquid; Boosting piston 211, master cylinder first piston 213 and master cylinder second piston 216 get back to initial position respectively under master cylinder first pull back spring 215 and the effect of master cylinder second pull back spring 218, and master cylinder ante-chamber 217, master cylinder back cavity 214 communicate with fluid reservoir 201 respectively by the 6th through hole 2-6 and fourth hole 2-4.
When chaufeur has braking requirement, by deeply stepping on brake pedal 206, master brake cylinder push rod 209 promote master brake cylinder push rod 219 promote pedal sense simulation and passive power-assisted Compound Cavity 210 in braking liquid, act on boosting piston 211, and act on master cylinder first piston 213, set up high pressure at master cylinder ante-chamber 217 and master cylinder back cavity 214 simultaneously, master cylinder ante-chamber 217 and master cylinder back cavity 214 inside brake liquid flow to four brake wheel cylinders 401, 402, 403, 404, ensure four brake wheel cylinders 401, 402, 403, the brake-pressure of 404, achieve the emergency braking under failure state.After boosting piston 211 moves to left, brake pedal force achieves amplification under pedal sense simulation and the effect of passive power-assisted Compound Cavity 210 hydraulic booster, namely can realize the passive power-assisted of brake pedal under failure state.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments within the spirit and principles in the present invention, equivalently to replace and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. one kind can set the Electro-hydraulic brake system of brake pedal feel flexibly, comprise hydraulic brake subsystem (1), described hydraulic brake subsystem (1) is made up of integrated form brake master cylinder assembly (10) and hydraulic control unit (30), it is characterized in that, described Electro-hydraulic brake system also comprises composite brakig control unit RBS and motor regenerative braking subsystem (3), and described hydraulic brake subsystem (1), composite brakig control unit RBS are connected successively with motor regenerative braking subsystem (3);
Described integrated form brake master cylinder assembly (10) is made up of integrated form master brake cylinder and high pressure fuel source, and described integrated form master brake cylinder comprises oil cabinet (201), pedal sense simulates oil-feed electromagnetic valve (202), pedal sense simulates solenoid (203), pedal sense hydraulic pressure transducer (204) and housing assembly (205);
Described pedal sense simulation oil-feed electromagnetic valve (202) one end simulates solenoid (203) one end with pedal sense and is connected, described pedal sense hydraulic pressure transducer (204) and housing assembly (205) are connected on pedal sense simulation oil-feed electromagnetic valve (202) respectively and pedal sense simulates between solenoid (203), the other end of described pedal sense simulation oil-feed electromagnetic valve (202) is connected with high pressure fuel source, and the other end that described pedal sense simulates solenoid (203) is connected with oil cabinet (201).
2. a kind of Electro-hydraulic brake system that can set brake pedal feel flexibly according to claim 1, it is characterized in that, described pedal sense simulation oil-feed electromagnetic valve (202) and pedal sense simulate solenoid (203) and are normally-off electromagnetic valve.
3. a kind of Electro-hydraulic brake system that can set brake pedal feel flexibly according to claim 1, it is characterized in that, described housing assembly (205) comprises brake pedal (206), pedal displacement sensor (207), cylinder body (208) and is arranged on master brake cylinder push rod (209), boosting piston (211), master cylinder first piston (213), master cylinder first pull back spring (215), master cylinder second piston (216), master cylinder second pull back spring (218) in cylinder body (208);
Described cylinder body (208) is provided with the first through hole (2-1), the second through hole (2-2), third through-hole (2-3), fourth hole (2-4), fifth hole (2-5), the 6th through hole (2-6) and the 7th through hole (2-7);
Described brake pedal (206) and pedal displacement sensor (207) are arranged on master brake cylinder push rod (209);
Described master brake cylinder push rod (209) and boosting piston (211) form pedal sense and simulate and passive power-assisted Compound Cavity (210) in cylinder body (208), this pedal sense simulation and passive power-assisted Compound Cavity (210) be connected with oil cabinet (201) by the first through hole (2-1) on cylinder body (208), and simulate oil-feed electromagnetic valve (202) with pedal sense respectively by the second through hole (2-2), pedal sense simulates solenoid (203) and pedal sense hydraulic pressure transducer (204) is connected;
Described boosting piston (211) and master cylinder first piston (213) are formed initiatively power-assisted chamber (212) in cylinder body (208), and this active power-assisted chamber (212) is connected with high pressure fuel source and oil cabinet (201) respectively by the third through-hole (2-3) on cylinder body (208);
Described master cylinder first piston (213) and master cylinder second piston (216) form master cylinder back cavity (214) in cylinder body (208), this master cylinder back cavity (214) is connected with oil cabinet by the fourth hole (2-4) on cylinder body (208), and be connected with hydraulic control unit (30) by fifth hole (2-5), described the first pull back spring (215) two ends are separately fixed on the end face of master cylinder first piston (213) and master cylinder second piston (216);
Described master cylinder second piston (216) forms master cylinder ante-chamber (217) with the sidewall of cylinder body (208), this master cylinder ante-chamber (217) is communicated with oil cabinet (201) by the 6th through hole (2-6) on cylinder body (208), and be connected with hydraulic control unit (30) by the 7th through hole (2-7), described the second pull back spring (218) two ends are separately fixed on the end face of master cylinder second piston (216) and the sidewall of cylinder body (208).
4. a kind of Electro-hydraulic brake system that can set brake pedal feel flexibly according to claim 3, it is characterized in that, described high pressure fuel source comprises the first check valve (101), motor-drive pump (102), second check valve (103), high pressure accumulator (104), oil pressure pressure sensor (105) and open type switch electromagnetic valve (106), described third through-hole (2-3) respectively with oil pressure pressure sensor (105), high pressure accumulator (104) is connected with the entrance of open type switch electromagnetic valve (106), the outlet of open type switch electromagnetic valve (106) connects oil cabinet (201), the entrance of described motor-drive pump (102) is connected with oil cabinet (201) by the first check valve (101), the outlet of motor-drive pump (102) is connected with high pressure accumulator (104) by the second check valve (103).
5. a kind of Electro-hydraulic brake system that can set brake pedal feel flexibly according to claim 3, it is characterized in that, described hydraulic control unit (30) is provided with two input ports and four delivery ports, each input port correspondence is provided with two described delivery ports, two described input ports connect fifth hole (2-5) on cylinder body (205) and the 7th through hole (2-7) respectively, four described delivery ports connect the brake wheel cylinder (401,402,403,404) of four wheels respectively, form four independently controlling brancher.
6. a kind of Electro-hydraulic brake system that can set brake pedal feel flexibly according to claim 5, it is characterized in that, described hydraulic control unit (30) comprises for controlling four brake wheel cylinders (401, 402, 403, 404) hydraulic package and control group, two controlling brancher that described each input port is corresponding share one group of hydraulic package, every bar controlling brancher is equipped with control group, described hydraulic package comprises check valve (301, 302, 303, 304), Hydraulic Pump (305, 306), oil return motor (307) and low pressure accumulator (308, 309), described Hydraulic Pump (305, 306) oil return motor (307) both sides are laid respectively at, driven by oil return motor (307), described Hydraulic Pump (305, 306) respectively there is a check valve both sides, described control group is made up of open type switch electromagnetic valve (310,311,312,313) and normally-off switch electromagnetic valve (314,315,316,317).
7. a kind of Electro-hydraulic brake system that can set brake pedal feel flexibly according to claim 5, it is characterized in that, the brake wheel cylinder (401,402,403,404) of four described wheels is equipped with wheel speed sensors (405,406,407,408).
8. a kind of Electro-hydraulic brake system that can set brake pedal feel flexibly according to claim 1, it is characterized in that, described motor regenerative braking subsystem (3) comprise connect successively motor (3-1), electric machine controller MCU, entire car controller VMS, battery management system BMS and battery pack (3-2), described entire car controller VMS is connected with composite brakig control unit RBS.
9. a kind of Electro-hydraulic brake system that can set brake pedal feel flexibly according to claim 4, it is characterized in that, described composite brakig control unit RBS possesses data acquisition interface, driver output interface and communication interface, described data acquisition interface respectively with pedal displacement sensor (207), oil pressure pressure sensor (105), wheel speed sensors (405, 406, 407, 408) and pedal sense hydraulic pressure transducer (204) connect, described driver output interface and pedal sense simulate oil-feed electromagnetic valve (202), pedal sense simulates solenoid (203) and is connected with the motor-drive pump (102) in high pressure fuel source and open type switch electromagnetic valve (106), described communication interface at least comprises two, a communication interface is connected with entire car controller VMS, another communication interface is connected with hydraulic control unit (30).
10. a kind of Electro-hydraulic brake system that can set brake pedal feel flexibly according to claim 1, it is characterized in that, this system has initial preparation state, normal working and failure state three kinds of mode of operations, described normal working comprises conventional brake master mode, ABS master mode and ASR master mode, described ABS master mode is divided into two kinds of control methods: 1) when ABS enters control, regenerative braking is exited immediately; 2) when ABS enters control, regenerative braking power participates in ABS and controls.
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| KR101734038B1 (en) * | 2013-12-13 | 2017-05-11 | 주식회사 만도 | Device for regulate of flex brake pedal feeling |
| CN103786703B (en) * | 2014-01-28 | 2017-04-12 | 同济大学 | Electro-hydraulic composite braking system hierarchical control structure and method of integrated braking cylinder |
| CN104033434A (en) * | 2014-06-19 | 2014-09-10 | 北京北方车辆集团有限公司 | Automatic oil return device for vehicular hydraulic systems and control circuit thereof |
| KR101638345B1 (en) * | 2015-01-26 | 2016-07-13 | 주식회사 만도 | Electric brake system |
| CN105070180A (en) * | 2015-07-15 | 2015-11-18 | 无锡商业职业技术学院 | Automobile hydraulic brake system experimental device |
| JP6634980B2 (en) * | 2016-07-27 | 2020-01-22 | 株式会社アドヴィックス | Vehicle braking control device |
| US10464536B2 (en) | 2016-11-11 | 2019-11-05 | Honda Motor Co., Ltd. | Adaptive vehicle braking systems, and methods of use and manufacture thereof |
| US10173661B2 (en) * | 2016-11-23 | 2019-01-08 | GM Global Technology Operations LLC | Brake fade management system for a brake-by-wire system |
| CN108032848B (en) * | 2018-01-08 | 2023-09-08 | 吉林大学 | Braking energy recovery device and control method thereof |
| CN108162942B (en) * | 2018-02-06 | 2019-07-19 | 吉林大学 | The line traffic control brake fluid system and its brake control method of four-wheel pressure independent control |
| CN109353323A (en) * | 2018-10-25 | 2019-02-19 | 宁波圣龙汽车动力系统股份有限公司 | The ABS control system and method for Electro-hydraulic brake based on hub motor |
| CN109367395B (en) * | 2018-11-14 | 2023-06-09 | 南京航空航天大学 | Electrohydraulic composite braking system and control method thereof |
| CN110182187B (en) * | 2019-05-21 | 2020-12-29 | 清华大学 | Energy feedback type active braking system with failure protection capability and control method |
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