CN106627551B - Integrated decoupling type electric power-assisted braking system suitable for regenerative braking - Google Patents

Abstract

The invention discloses an integrated decoupling type electric power-assisted braking system suitable for regenerative braking, which aims to solve the problem of complex pedal decoupling during pedal feel simulation and regenerative braking and comprises a brake pedal, an integrated electric power-assisted mechanism, a brake master cylinder, a liquid storage cylinder, a hydraulic system, four wheel cylinders and a liquid storage tank. The integrated electric power assisting mechanism comprises a brake pedal push rod and a brake push rod; the hydraulic system comprises a hydraulic system, a reversing valve A, a brake pedal push rod, a brake main cylinder, a second chamber oil port, a front shaft isolating valve P, a brake main cylinder, a hydraulic system and a hydraulic system, wherein a liquid storage piston rod of the liquid storage cylinder is connected with the liquid storage ball screw, the liquid storage cylinder is connected with the reversing valve A of the hydraulic system, the brake pedal push rod is connected with the brake pedal, the brake push rod is connected with the brake main cylinder, the brake main cylinder is connected with the liquid storage tank, and the second chamber oil port of the brake main cylinder is connected with the front shaft isolating valve P in the hydraulic system; the oil port of the first chamber of the brake master cylinder is connected with the P port of a rear axle isolating valve of the hydraulic system; the left front wheel pressure reducing valve of the hydraulic system is connected with the right front wheel pressure reducing valve and the two front wheel cylinders, and the right rear wheel pressure reducing valve of the hydraulic system is connected with the left rear wheel pressure reducing valve and the two rear wheel cylinders.

Description

Integrated decoupled electric power assist braking system for regenerative braking

technical field

The invention relates to an electric power-assisted braking system belonging to the technical field of automobile engineering, more precisely, the invention relates to an integrated decoupling electric power-assisted braking system suitable for regenerative braking.

Background technique

1. Brake booster

At present, the hydraulic braking system of most automobiles uses vacuum boosting. When applied to new energy vehicles, a vacuum pump needs to be equipped separately to extract the vacuum. This solution adds a vacuum pump, which increases the cost and is not conducive to space layout. Another part of the car adopts motor-assisted braking, and the size of the assist is controllable. It does not require a vacuum pump and saves layout space.

2. Regenerative braking technology

Automobile regenerative braking can realize the recovery of automobile braking energy and increase the utilization rate of the total energy of the automobile. Regenerative braking means that when a new energy vehicle is decelerating or braking, the motor is dragged back to generate braking torque, which acts on the drive shaft to convert part of the mechanical energy of the vehicle into electrical energy and store it in the energy storage element. In this process, the regenerative braking force replaces part of the frictional braking force of the drive shaft, so the frictional braking force of the drive shaft can be reduced accordingly, ensuring that the total braking force and the distribution of the braking force between the front and rear axles meet the requirements of the braking regulations.

3. Brake pedal decoupling and pedal feel simulation

The existence of regenerative braking force replaces part of the frictional braking force of the drive shaft, so the brake fluid that generates this part of the frictional braking force needs to be stored separately to realize the decoupling of the brake pedal and the brake wheel cylinder. For a car using a vacuum booster, since the boosting characteristics of the vacuum booster are fixed, it is more complicated to design a pedal feel simulator with PV characteristics that meet the pedal feel requirements to keep the pedal feel unchanged when the pedal is decoupled. The electric power-assisted braking system can meet different pedal feel requirements by adjusting the power boost of the motor. When decoupling, it only needs to add a variable-volume fluid storage cylinder to introduce the excess brake fluid during regenerative braking into the fluid storage cylinder. The decoupling of the pedal and the wheel cylinder can be realized.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the pedal feeling simulation and pedal decoupling complex problems during regenerative braking in the prior art, and provide an integrated decoupling electric power-assisted braking system suitable for regenerative braking.

In order to solve the above technical problems, the present invention is realized by adopting the following technical scheme: the integrated decoupling electric power-assisted braking system suitable for regenerative braking includes a brake pedal, an integrated electric power-assisted mechanism, a brake Master cylinder, fluid reservoir, hydraulic system, left front wheel cylinder, right front wheel cylinder, right rear wheel cylinder, left rear wheel cylinder and fluid reservoir.

The hydraulic system includes a front axle hydraulic system and a rear axle hydraulic system;

The front axle hydraulic system also includes decoupling check valve, No. 1 check valve, front axle damper, No. 2 check valve, front axle suction valve, left front wheel return check valve, left front wheel booster valve , Front axle accumulator, No. 3 one-way valve, right front wheel booster valve and right front wheel return fluid one-way valve.

The P port of the reversing valve is connected to the B port pipeline of the front axle isolation valve, the B port of the reversing valve is connected to the oil inlet pipeline of the decoupling one-way valve, and the oil outlet of the decoupling one-way valve It is connected with the oil inlet of the front axle plunger pump, the oil outlet of No. 3 check valve and the first oil port of the front axle suction valve; the P port of the front axle isolation valve and the other oil port of the front axle suction valve No. check valve oil outlet pipeline connection, A port of the front axle isolation valve and P port of the left front wheel booster valve, P port of the right front wheel booster valve, and oil outlet of the left front wheel return fluid check valve 1. One end of the right front circulation fluid check valve and the front axle damper is connected to the oil inlet pipeline of the No. 2 check valve; the outlet end of the front axle plunger pump is connected to the oil inlet pipeline of the No. 1 check valve. The oil outlet of the No. 1 one-way valve is connected to the other end of the front axle damper. The first oil port of the valve is connected to the pipeline, the A port of the right front wheel booster valve and the liquid inlet port of the right front circulation check valve are connected to the first oil port of the right front wheel pressure reducing valve, and the left front wheel pressure reducing valve The other oil port of the right front wheel is connected with the other oil port of the right front wheel pressure reducing valve and one end of the front axle accumulator is connected with the oil inlet pipeline of the No. 3 one-way valve.

The rear axle hydraulic system also includes rear axle isolating valve, No. 4 one-way valve, rear axle damper, No. 5 one-way valve, rear axle suction valve, right rear circulation fluid one-way valve, left rear circulation fluid one-way valve Valve, right rear wheel booster valve, left rear wheel booster valve, rear axle accumulator and No. 6 check valve.

The P port of the rear axle isolation valve and the first oil port of the rear axle suction valve are connected to the oil outlet pipeline of the No. 5 check valve, and the A port of the rear axle isolation valve is connected to the oil inlet of the No. 5 check valve. , the left end of the rear axle damper, the oil outlet of the right rear circulation fluid check valve, the oil outlet of the left rear circulation fluid check valve, the P port of the right rear wheel booster valve and the P port of the left rear wheel booster valve The oil inlet of the rear axle plunger pump and the other oil port of the rear axle suction valve are connected to the oil outlet of the No. The oil inlet of the valve is connected with the oil inlet pipeline of the No. 4 check valve, and the oil outlet of the No. 4 check valve is connected with the right end pipeline of the rear axle damper 28; The oil port is connected to the first oil port pipeline of the right rear wheel pressure reducing valve, and the A port of the left rear wheel booster valve and the oil inlet port of the left rear circulation fluid check valve are connected to the first interface pipeline of the left rear wheel pressure reducing valve Connect, the other oil port of the right rear wheel pressure reducing valve is connected with the other interface of the left rear wheel pressure reducing valve and one end of the rear axle accumulator is connected with the oil inlet pipeline of the No. 6 one-way valve.

The right end of the liquid storage piston rod of the liquid storage cylinder is loaded into the integrated electric power booster from the N port of the integrated electric power booster, and fixed on the right side of the liquid storage ball screw of the integrated electric power booster by bolts On the wall, the left end interface of the liquid storage cylinder is connected to the A-port pipeline of the reversing valve of the front axle hydraulic system, the right end of the brake pedal push rod of the integrated electric power booster is connected to the brake pedal, and the integrated electric power booster The brake push rod is in contact with the right end face of the first piston in the brake master cylinder, the two oil supply ports on the brake master cylinder are connected to the pipeline of the liquid storage tank, the oil port of the second chamber of the brake master cylinder and the The P port pipeline connection of the front axle isolation valve in the front axle hydraulic system; the oil port of the first chamber of the brake master cylinder and the P port pipeline connection of the rear axle isolation valve in the rear axle hydraulic system; the front axle hydraulic pressure The interface ports of the left front wheel pressure reducing valve and the right front wheel pressure reducing valve in the system are respectively connected with the pipelines of the left front wheel cylinder and the right front wheel cylinder, and the right rear wheel pressure reducing valve in the rear axle hydraulic system is connected with the left One interface of the rear wheel pressure reducing valve is respectively connected with the right rear wheel cylinder and the left rear wheel cylinder pipeline. , Right output terminal connection.

The integrated electric power assist mechanism described in the technical solution includes No. 1 electric power assist mechanism, No. 2 electric power assist mechanism and transmission mechanism; gear, liquid storage secondary gear and liquid storage transmission gear; the power transmission gear set is fixedly connected to the power screw nut of No. 1 electric power booster with a key, and the motor pinion is installed on the output shaft of the power booster motor through the key On, the motor pinion is externally meshed with the power transmission gear;

The clutch connects the liquid storage primary gear with the output shaft of the booster motor, the liquid storage primary gear is externally meshed with the liquid storage secondary gear arranged above and below, and the liquid storage secondary gear is externally meshed with the liquid storage transmission gear arranged above and below. The hydraulic transmission gear is set and fixedly connected to the liquid storage lead screw nut of the No. 2 electric booster mechanism with a key.

The No. 1 electric booster mechanism described in the technical solution includes a booster screw nut, a feedback disc, a booster valve body, a booster ball screw, a brake push rod and a brake pedal push rod; the booster valve body is installed on the booster ball Inside the lead screw, the brake pedal push rod is inserted into the inner cavity of the booster valve body through the booster ball screw and the right through hole in the center of the booster valve body, and inserted into the left through hole of the booster valve body, but the distance is reserved for extending out of the left through hole There is a gap of 2 to 3mm, the right side wall of the booster valve body is in contact with the inner wall of the right side wall of the booster ball screw; the booster ball screw with the booster valve body installed in the booster screw nut, the booster ball screw and the The balls of the power-assisted ball screw are between the nuts of the power-assisted screw; the disc-shaped feedback plate is installed on the left side of the inner cavity of the power-assisted valve, and the right end surface of the feedback plate is in contact with the left end of the ring-shaped boss built in the left side of the power-assisted valve body. The surfaces are in contact, and the left end surface of the feedback disc is in contact with the right end surface of the push rod.

The booster valve body described in the technical solution is a hollow cylindrical structural part, the outer diameter of the booster valve body is the same as the inner diameter of the booster ball screw, and the center of the right side wall of the booster valve body is provided with a central right through hole. The side is open, but there is a built-in boss with a rectangular cross-section in the shape of a torus. A left through hole is arranged in the center of the torus shaped boss. The diameter of the left through hole is the same as that of the right through hole. The axis of rotation of the right through hole coincides with the axis of rotation of the booster valve body.

The No. 2 electric power assist mechanism described in the technical solution includes a liquid storage screw nut and a liquid storage ball screw. The liquid storage ball screw is a hollow structure, the right end of the liquid storage ball screw is provided with a right side wall, and three through holes are evenly distributed on the right side wall from its outer surface axially inward. The through hole on the right side wall of the liquid storage ball screw is opposite to the threaded blind hole on the right end boss of the liquid storage piston rod, that is, the through hole on the right side wall of the liquid storage ball screw is aligned with the right end boss of the liquid storage piston rod. The rotation axis of the threaded blind hole is collinear; the inner diameter of the liquid storage ball screw is equal to the outer diameter of the right end boss of the liquid storage piston rod, and the liquid storage ball screw installed with the liquid storage piston rod is installed on the liquid storage screw nut. Among them, the balls of the liquid storage ball screw are between the liquid storage ball screw and the liquid storage ball screw nut.

The liquid storage cylinder described in the technical solution includes a liquid storage cylinder body, a liquid storage piston rod and a spring. The left end of the liquid storage piston rod is a piston, the diameter of the piston is equal to the inner diameter of the liquid storage cylinder, the right end is a push rod, the diameter of the push rod is equal to the inner diameter of the central through hole on the cylinder wall at the right end of the liquid storage cylinder, and the right end of the push rod is A cylindrical boss is provided, and the diameter of the cylindrical boss is equal to the inner diameter of the liquid storage ball screw in the integrated electric power-assisted mechanism. The right end of the boss is provided with three uniformly distributed bolts along the axial direction to fix the liquid storage piston rod on the storage tank. The threaded blind hole on the right side wall of the liquid ball screw; the liquid storage piston rod is installed in the liquid storage cylinder, the liquid storage piston rod and the liquid storage cylinder are in sliding connection, and the right end of the liquid storage piston rod is connected from the liquid storage cylinder The right end of the body protrudes, the spring is set on the push rod in the liquid storage piston rod, the right end surface of the spring is in contact with the right side of the left end piston of the liquid storage piston rod, and the right end surface of the spring is fixed on the inner side of the right end of the liquid storage cylinder body on the wall.

Compared with prior art, the beneficial effects of the present invention are:

1. The integrated decoupled electric power-assisted braking system suitable for regenerative braking described in the present invention adopts motor-assisted braking, does not depend on vacuum, and can maintain a pedal feel similar to that of a vacuum booster;

2. The integrated decoupled electric power-assisted braking system suitable for regenerative braking described in the present invention can keep the pedal feel unchanged by adjusting the power-assisted characteristics of the motor during regenerative braking;

3. The integrated decoupling electric power-assisted braking system suitable for regenerative braking described in the present invention makes the amount of brake fluid removed from the brake master cylinder equal to the amount of brake fluid in the storage cylinder through structural design, and the control is more accurate. convenient;

4. The integrated decoupling electric power-assisted braking system suitable for regenerative braking of the present invention realizes the coordinated braking of regenerative braking and friction braking, and can recover braking energy as much as possible.

Description of drawings

Below in conjunction with accompanying drawing, the present invention will be further described:

Fig. 1 is a schematic diagram of the structural composition of the integrated decoupling electric power-assisted braking system suitable for regenerative braking according to the present invention;

Fig. 2 is a schematic diagram of the structural composition of the integrated decoupling electric power assist braking system suitable for regenerative braking according to the present invention;

Fig. 3 is a schematic diagram of the structural composition of the integrated decoupled electric power-assisted braking system liquid storage cylinder suitable for regenerative braking according to the present invention;

Fig. 4 is a schematic diagram of the working conditions of the integrated decoupling electric power-assisted braking system suitable for regenerative braking according to the present invention during conventional braking and ABS braking;

Fig. 5 is a schematic diagram of the working conditions of the integrated decoupling electric power-assisted braking system ESP suitable for regenerative braking according to the present invention;

Fig. 6 is a schematic diagram of working conditions when the regenerative braking intensity of the integrated decoupling electric power-assisted braking system suitable for regenerative braking increases and does not reach the maximum value according to the present invention;

Fig. 7 is a schematic diagram of the working conditions of the integrated decoupled electric power-assisted braking system suitable for regenerative braking according to the present invention when the regenerative braking intensity is maintained;

Fig. 8 is a schematic view of the working conditions of the integrated decoupled electric power-assisted braking system suitable for regenerative braking according to the present invention when the regenerative braking intensity is reduced and the total braking intensity is constant;

Fig. 9 is a schematic diagram of the working conditions of the integrated decoupled electric power-assisted braking system suitable for regenerative braking according to the present invention when the regenerative braking intensity decreases and the total braking intensity increases;

Fig. 10-a is a schematic diagram of working conditions in which the wheel cylinder hydraulic pressure decreases first when the regenerative braking intensity of the integrated decoupled electric power-assisted braking system suitable for regenerative braking decreases and the total braking intensity decreases;

Fig. 10-b is a schematic diagram of the working condition of the regenerative brake hydraulic pressure after the regenerative brake hydraulic pressure is reduced when the regenerative braking intensity of the integrated decoupling electric power-assisted braking system suitable for regenerative braking is reduced and the total braking intensity is reduced according to the present invention ;

In the figure: 1. Brake pedal, 2. Integrated electric booster mechanism, 3. Brake master cylinder, 4. Fluid storage cylinder, 5. Rear axle isolation valve, 6. Reversing valve, 7. Front axle isolation valve, 8. Decoupling check valve, 9. Front axle plunger pump, 10. No. 1 check valve, 11. Front axle damper, 12. No. 2 check valve, 13. Front axle suction valve, 14. Left front circulation Hydraulic one-way valve, 15. Left front wheel booster valve, 16. Front axle accumulator, 17. No. 3 one-way valve, 18. Right front wheel booster valve, 19. Right front wheel fluid one-way valve, 20. Left front wheel pressure reducing valve, 21. Right front wheel pressure reducing valve, 22. Left front wheel cylinder, 23. Right front wheel cylinder, 24. Right rear wheel cylinder, 25. Left rear wheel cylinder, 26. Rear axle plunger pump, 27. No. 4 check valve, 28. Rear axle damper, 29. No. 5 check valve, 30. Rear axle suction valve, 31. Right rear circulation fluid check valve, 32. Right rear Wheel booster valve, 33. Rear axle accumulator, 34. No. 6 one-way valve, 35. Left rear wheel booster valve, 36. Left rear wheel fluid check valve, 37. Right rear wheel decompression valve, 38 .Left rear wheel pressure reducing valve, 39. Booster transmission gear, 40. Booster screw nut, 41. Feedback plate, 42. Booster valve body, 43. Booster ball screw, 44. Booster motor, 45. Motor pinion, 46. clutch, 47. liquid storage primary gear, 48. liquid storage secondary gear, 49. liquid storage transmission gear, 50. liquid storage screw nut, 51. liquid storage ball screw, 52. liquid storage piston rod, 53. Brake push rod, 54. Brake pedal push rod, 55. Fluid storage tank.

Detailed ways

The present invention is described in detail below in conjunction with accompanying drawing:

Referring to Fig. 1, the integrated decoupling electric power-assisted braking system suitable for regenerative braking according to the present invention is suitable for vehicles with type II brake pipeline arrangement, and is a front axle decoupling braking system.

The integrated decoupled electric power-assisted braking system suitable for regenerative braking includes a brake pedal 1, an integrated electric power-assisted mechanism 2, a brake master cylinder 3, a fluid storage cylinder 4, a hydraulic system, and a left front wheel Cylinder 22, right front wheel cylinder 23, right rear wheel cylinder 24, left rear wheel cylinder 25 and liquid storage tank 55.

The hydraulic system of the integrated decoupling electric power-assisted braking system suitable for regenerative braking includes a front axle hydraulic system and a rear axle hydraulic system, and the front axle hydraulic system includes decoupling components.

The front axle hydraulic system includes a reversing valve 6, a front axle isolation valve 7, a decoupling check valve 8, a front axle plunger pump 9, a first check valve 10, a front axle damper 11, and a second check valve. Valve 12, front axle suction valve 13, left front circulation fluid one-way valve 14, right front circulation fluid one-way valve 19, left front wheel boost valve 15, right front wheel boost valve 18, front axle accumulator 16, No.3 Check valve 17, left front wheel pressure reducing valve 20 and right front wheel pressure reducing valve 21.

The P port of the reversing valve 6 is connected to the B port of the front axle isolation valve 7, the A port is connected to the left end interface of the liquid storage cylinder 4, and the B port of the reversing valve 6 is connected to the decoupling check valve. 8 is connected to the inlet end pipeline. When the reversing valve 6 works at the left end position, its P port and A port are connected, which is the normal state of the reversing valve 6. When the reversing valve 6 works at the right end position, its A port and B port are connected. connected.

The front axle isolating valve 7 is a three-position three-way electromagnetic reversing valve, the P port of the front axle isolating valve 7 is connected with the oil port pipeline of the second chamber of the brake master cylinder 3, and the port of the front axle isolating valve 7 is A port is connected to the P port pipeline of the left front wheel boost valve 15 and the right front wheel boost valve 18, the B port of the front axle isolation valve 7 is connected to the P port pipeline of the reversing valve 6, and the front axle isolation valve 7 When it works at the right end position, its P port and A port are connected, which is the normal state of the front axle isolation valve 7. When the front axle isolation valve 7 works at the middle position, its P port, A port and B port are not connected to each other, and the front axle isolation valve 7 is not connected to each other. When the valve 7 works at the left end position, its port P and port B are in communication; a pipeline is used between the port P and the port A and a No. 2 check valve 12 is connected. The outlet of the one-way valve 12 is connected to the P port.

The inlet end of the decoupling one-way valve 8 is connected to the B port pipeline of the reversing valve 6, and the outlet end is connected to the inlet pipeline of the front axle plunger pump 9.

The front axle plunger pump 9 and the rear axle plunger pump 26 are respectively connected with the left and right output ends of the same motor by couplings, and the inlet end of the front axle plunger pump 9 is connected to the other end of the front axle suction valve 13. 1. The outlet of No. 3 check valve 17 is connected to the outlet pipeline of decoupling check valve 8; the outlet of front axle plunger pump 9 is connected to the inlet pipeline of No. 1 check valve 10, and The outlet end of the valve 10 is connected to the pipeline at one end of the front axle damper 11 , and the other end of the front axle damper 11 is connected to the A port pipeline of the front axle isolation valve 7 .

The front axle suction valve 13 is a normally closed two-position two-way electromagnetic reversing valve. One interface end of the front axle suction valve 13 is connected with the second chamber pipeline of the brake master cylinder 3. The front axle suction valve 13 The other interface end of the front axle piston pump 9 is connected with the inlet pipeline.

The left front wheel booster valve 15 and the right front wheel booster valve 18 are normally open two-position two-way electromagnetic reversing valves, that is, high-speed switching valves, and the left front wheel booster valve 15 and the right front wheel booster valve The liquid inlet port of 18, that is, P port, is connected to the A port pipeline of the front axle isolation valve 7, and the liquid outlet port of the left front wheel booster valve 15 and the right front wheel booster valve 18, that is, A port, are connected to the left front wheel wheel respectively. Cylinder 22 and right front wheel cylinder 23.

The liquid inlet ports of the left front circulation fluid check valve 14 and the right front circulation fluid check valve 19 are respectively connected with the A port pipelines of the left front wheel boost valve 15 and the right front wheel boost valve 18, and the left front loop fluid single The liquid outlets of the directional valve 14 and the right front wheel return check valve 19 are respectively connected with the P port pipelines of the left front wheel booster valve 15 and the right front wheel booster valve 18 .

The left front wheel pressure reducing valve 20 and the right front wheel pressure reducing valve 21 are both normally closed two-position two-way electromagnetic reversing valves, that is, high-speed switching valves, and the left front wheel pressure reducing valve 20 and the right front wheel pressure reducing valve One port of 21 is respectively connected with the left front wheel cylinder 22 and the right front wheel cylinder 23 pipelines, and the other port of the left front wheel decompression valve 20 and the right front wheel decompression valve 21 are connected with the third one-way valve 17 Inlet pipe connection.

The front axle accumulator 16 is connected to the inlet port of the No. 3 one-way valve 17, an interface of the left front wheel pressure reducing valve 20 and an interface of the right front wheel pressure reducing valve 21.

The rear axle hydraulic system includes rear axle isolation valve 5, rear axle plunger pump 26, No. 4 check valve 27, rear axle damper 28, No. 5 check valve 29, rear axle suction valve 30, right rear circulation Liquid one-way valve 31, left rear circulation fluid one-way valve 36, right rear wheel booster valve 32, left rear wheel booster valve 35, rear axle accumulator 33, No. 6 one-way valve 34, right rear wheel decompression Valve 37 and left rear wheel decompression valve 38.

The rear axle isolation valve 5 is a normally open two-position two-way electromagnetic reversing valve, that is, an on-off valve. The P port of the rear axle isolation valve 5 is connected to the first chamber pipeline of the brake master cylinder 3. Port A of the isolation valve 5 is connected with the port P of the right rear wheel boost valve 32 and the port P of the left rear wheel boost valve 35 .

The rear axle plunger pump 26 and the front axle plunger pump 9 are respectively connected with the left and right output ends of the same motor by a coupling, and the inlet end of the rear axle plunger pump 26 is connected to the other end of the rear axle suction valve 30. The interface end is connected to the outlet pipeline of the No. 6 check valve 34, the outlet end of the rear axle plunger pump 26 is connected to the inlet pipeline of the No. 4 check valve 27, and the outlet end of the No. 4 check valve 27 is connected to the rear axle One end of the damper 28 is connected to the pipeline, and the other end of the rear axle damper 28 is connected to the A port pipeline of the rear axle isolating valve 5 .

The rear axle suction valve 30 is a normally closed two-position two-way electromagnetic reversing valve, that is, an on-off valve. One interface end of the rear axle suction valve 30 is connected to the oil port pipeline of the first chamber of the brake master cylinder 3 , the other interface end of the rear axle suction valve 30 is connected to the inlet port of the rear axle plunger pump 26 in a pipeline.

The right rear wheel booster valve 32 and the left rear wheel booster valve 35 are normally open two-position two-way electromagnetic reversing valves, that is, high-speed switch valves, and the right rear wheel booster valve 32 and the left rear wheel booster valve The P ports of 35 are all connected to the A port pipeline of the rear axle isolation valve 5, and the A ports of the right rear wheel booster valve 32 and the left rear wheel booster valve 35 are connected with the right rear wheel cylinder 24 and the left rear wheel cylinder respectively. 25 pipeline connections.

The liquid inlet ports of the right rear circulation fluid check valve 31 and the left rear circulation fluid check valve 36 are respectively connected with the A port pipelines of the right rear wheel booster valve 32 and the left rear wheel booster valve 35. The liquid outlets of the circulating fluid one-way valve 31 and the left rear circulating fluid one-way valve 36 are connected to the P port pipelines of the right rear wheel boost valve 32 and the left rear wheel boost valve 35 respectively.

The right rear wheel pressure reducing valve 37 and the left rear wheel pressure reducing valve 38 are normally closed two-position two-way electromagnetic reversing valves, that is, high-speed switch valves, and the right rear wheel pressure reducing valve 37 is connected with the left rear wheel pressure reducing valve. One interface end of 38 is connected with right rear wheel cylinder 24 and left rear wheel cylinder 25 pipelines successively, and the other interface end of right rear wheel decompression valve 37 and left rear wheel decompression valve 38 and No. 6 one-way valve 34 inlet pipe connection.

The interface of the rear axle accumulator 33 is connected to the inlet of the No. 6 one-way valve 34, the other interface of the right rear wheel decompression valve 37, and the other interface of the left rear wheel decompression valve 38. .

All the above-mentioned valves, except the single valve, are electronically controlled valves, which are controlled in different valve positions under different working conditions according to the brake control strategy in the brake ECU.

The brake master cylinder 3 is a brake master cylinder suitable for passenger cars, and the brake master cylinder 3 includes a brake master cylinder block, a second piston and a first piston; the second piston and the first piston will brake The inner cavity of the main cylinder is divided into 3 independent spaces, from left to right are the second chamber, the first chamber and the right chamber.

The center of the right side of the right piston is provided with a hemispherical groove, and the left end of the brake push rod 53 is arranged as a hemispherical top. The radius of curvature of the top of the top is the same, and the left end of the brake push rod 53 is installed in cooperation with the hemispherical groove on the right piston in the brake master cylinder 3, that is, the left side of the brake push rod 53 extends into the brake master cylinder during assembly. In the right chamber of 3, it is in contact with the hemispherical groove on the right piston of brake master cylinder 3, and it is not connected firmly between the two.

Referring to Fig. 2, the integrated electric power booster 2 includes the No. 1 electric power booster, the No. 2 electric power booster and the transmission mechanism;

The No. 1 electric booster mechanism includes a booster screw nut 40 , a feedback disc 41 , a booster valve body 42 , a booster ball screw 43 , a brake push rod 53 and a brake pedal push rod 54 .

The transmission mechanism includes a booster transmission gear 39, a booster motor 44, a motor pinion 45, a clutch 46, a liquid storage primary gear 47, a liquid storage secondary gear 48 and a liquid storage transmission gear 49;

The No. 2 electric power assist mechanism includes a liquid storage screw nut 50 and a liquid storage ball screw 51 .

The motor pinion 45 is fixed on the output shaft of the booster motor 44 through a key, and the motor pinion 45 is externally meshed with the booster transmission gear 39 . The booster transmission gear 39 is set and fixedly connected on the booster screw nut 40 with a key. The booster screw nut 40 rotates under the drive of the booster transmission gear 39 , thereby driving the booster ball screw 43 to move axially and linearly. The inside of the booster ball screw 43 is hollow, and the center of the right side wall of the booster ball screw 43 is provided with a central right through hole. The inner diameter of the booster ball screw 43 is the same as the outer diameter of the booster valve body 42. The rotary motion is transformed into the linear motion of the power-assisted ball screw 43, and at the same time, the power-assisted valve body 42 is pushed to do the linear motion.

The booster valve body 42 is installed inside the booster ball screw 43, the booster valve body 42 is a hollow cylindrical structure, the center of the right side wall of the booster valve body 42 is provided with a central right through hole, and the left side has no bottom. It is an open type, but it has a built-in boss with a rectangular cross-section. There is a left through hole in the center of the boss. The diameter of the left through hole is the same as that of the right through hole. The axis of rotation coincides with the axis of rotation of the booster valve body 42, and the brake pedal push rod 54 can be inserted into the inside of the booster valve body 42 through the right through hole of the booster valve body 42, and inserted into the left through hole, but the distance is reserved for extending out of the left through hole. There is a gap, about 2-3mm, the right side wall of the booster valve body 42 is in contact with the inner surface of the right side wall of the booster ball screw 43, and the booster valve body 42 moves linearly under the push of the booster ball screw 43, and the booster ball screw Between 43 and the booster screw nut 40 is the ball of the booster ball screw.

The feedback disc 41 is a disc-shaped structural member installed on the left side of the inner cavity of the booster valve body 42, and the right end surface of the feedback disc 41 is in contact with the left end surface of the ring-shaped boss built in the left side of the booster valve body 42. The left end surface of the feedback disk 41 is in contact with the right end surface of the brake push rod 53. After the brake pedal push rod 54 moves to the left and the reserved gap is eliminated, the right end surface of the feedback disk 41 is also in contact with the brake pedal push rod 54. The left end surfaces are in contact, and the feedback disc 41 transmits the motor power assist and the human braking force to the brake push rod 53 , and the brake push rod 53 acts on the right piston of the brake master cylinder 3 .

The left end of the brake push rod 53 is made into a convex hemispherical shape, and the center of the right side of the right piston of the brake master cylinder 3 is provided with a hemispherical groove, and the hemispherical groove at the left end of the brake push rod 53 is The top is matched with the hemispherical groove on the right piston of the brake master cylinder 3, that is, the left end of the brake push rod 53 protrudes from the M port of the integrated electric booster mechanism 2 during assembly, and extends into the brake master cylinder 3 In the right chamber of the brake master cylinder 3, it is in contact with the hemispherical groove on the right piston of the brake master cylinder 3. There is no solid connection between the two. The right end of the brake push rod 53 is in contact with the left end surface of the feedback disc 41 to receive the feedback disc The power that 41 transmits is passed to the right piston of brake master cylinder 3.

The clutch 46 connects the liquid storage primary gear 47 and the output shaft of the booster motor 44, and controls the combination or separation of the liquid storage primary gear 47 and the output shaft of the booster motor 44 according to the braking control strategy. The liquid storage secondary gear 48 is externally meshed with the liquid storage primary gear 47 and the liquid storage transmission gear 49 arranged up and down. The liquid storage transmission gear 49 is externally meshed with the liquid storage secondary gear 48, and the liquid storage transmission gear 49 is set and fixedly connected to the liquid storage lead screw nut 50 by keys. The liquid storage screw nut 50 rotates under the drive of the liquid storage transmission gear 49 , thereby driving the liquid storage ball screw 51 to move linearly along its axial direction.

The liquid storage ball screw 51 is a hollow structural member, and its right side is provided with a right side wall, and three through holes are evenly distributed on the right side wall from its outer surface axially inward. The threaded blind hole at the center of the right end face of the right end boss of the liquid storage piston rod 52 installed therein is relatively aligned, that is, the through hole on the right side wall of the liquid storage ball screw 51 is in line with the thread blind hole on the right end boss of the liquid storage piston rod 52. The axes of rotation of the holes are collinear; the inner diameter of the liquid storage ball screw 51 is equal to the outer diameter of the boss at the right end of the liquid storage piston rod 52, and the liquid storage piston rod 52 is fixed on the right side wall of the liquid storage ball screw 51 by bolts , the liquid storage ball screw 51 equipped with the liquid storage piston rod 52 is installed in the liquid storage ball screw nut 50, and the ball between the liquid storage ball screw 51 and the liquid storage ball screw nut 50 is the ball of the liquid storage ball screw; thus When the liquid storage screw nut 50 rotates, the liquid storage ball screw 51 can drive the liquid storage piston rod 52 to move linearly along its axis.

The integrated electric booster mechanism 2 uses the booster motor 44 as a power source to provide power for the piston movement in the brake master cylinder 3 and the liquid storage cylinder 4, and the brake pedal push rod 54 is inserted into the booster valve body 42 through the L port. A certain axial gap is reserved with the feedback disc 41 for inputting the brake pedal force. The feedback disc 41 receives the pedal force and the power boost of the booster motor 44, and transmits it to the brake push rod 53. The brake push rod 53 communicates with the brake pedal through the M port. The right piston of the moving master cylinder 3 contacts and drives it to move, and the liquid storage piston rod 52 extends into the integrated electric booster mechanism 2 through the N port, and is fixedly connected to the liquid storage ball screw 51, so that the liquid storage cylinder 4 pistons It can move axially under the drive of the booster motor 44.

In the described integrated electric booster mechanism 2, the two-stage transmission is from the booster motor 44 to the booster ball screw 43, and the three-stage transmission is from the booster motor 44 to the liquid storage ball screw 51, and the brake push rod 53 and the liquid storage The direction of linear motion of the piston rod 52 is opposite. The magnitude of the boost and the rotation direction of the output shaft of the boost motor 44 are determined by the brake control strategy in the brake ECU.

Referring to Fig. 3, the liquid storage cylinder 4 includes a liquid storage cylinder body, a liquid storage piston rod 52 and a spring;

The left end of the liquid storage piston rod 52 is a piston whose diameter is equal to the inner diameter of the liquid storage cylinder, and the right end is a push rod whose diameter is equal to the inner diameter of the central through hole on the right end cylinder wall of the liquid storage cylinder. The right end is provided with a columnar boss, and the right end of the boss is provided with three threaded blind holes evenly distributed along the axial direction. The liquid storage piston rod 52 can be fixed on the right side wall of the liquid storage ball screw 51 by using bolts, and the power is assisted under the control of the ECU. The motor 44 drives the liquid storage piston rod 52 to move axially, so that the piston of the liquid storage cylinder 4 moves axially to change the volume of the liquid storage cylinder 4 .

The liquid storage piston rod 52 is put into the liquid storage cylinder body, and the liquid storage piston rod 52 is slidingly connected with the liquid storage cylinder body. The N port of the booster mechanism 2 extends into the inner hole of the liquid storage ball screw 51, and is fixedly connected to the right side wall of the liquid storage ball screw 51 by bolts, and the right side of the left end piston of the liquid storage piston rod 52 is connected with a The spring of the push rod set in the liquid storage piston rod 52, the right end of the spring is fixed on the inner wall of the right end of the liquid storage cylinder body, when the piston moves to the right, the spring will be compressed, and when the left end piston of the liquid storage piston rod 52 reaches the right limit position, regeneration The braking strength reaches the maximum value that the system can provide, but due to the limitation of the braking control strategy, the actual regenerative braking strength is usually smaller than the maximum strength limited by the system, so the left end piston of the liquid storage piston rod 52 usually cannot reach the right limit position, The left end interface of the liquid storage cylinder body is connected with the A port pipeline of the reversing valve 6 .

The working principle of the described integrated decoupled electric power-assisted braking system suitable for regenerative braking:

Referring to Fig. 1 and Fig. 2, when the integrated decoupled electric power-assisted braking system suitable for regenerative braking according to the present invention needs power-assisted braking, when the driver depresses the brake pedal 1, the brake ECU controls the power-assisted motor 44 action, the brake assist is provided by the booster motor 44, through the motor pinion 45, the booster transmission gear 39, the booster screw nut 40, the booster ball screw 43, the booster valve body 42, the feedback disc 41 and the brake push rod 53 will The rotary motion of the output shaft of the booster motor 44 is converted into the linear motion of the brake push rod 53, and exerts force on the brake master cylinder 3, and the brake hydraulic pressure in the brake master cylinder 3 enters the brake hydraulic circuit.

The second chamber of the brake master cylinder 3 is connected to the front axle brake circuit, and the first chamber is connected to the rear axle brake circuit. The regenerative braking is used for the drive shaft. In this example, the front axle is the drive shaft. The piping arrangement is Type II, decoupled on the front axle.

When the integrated decoupling electric power-assisted braking system suitable for regenerative braking according to the present invention requires decoupling of the pedal, the power-assisted motor 44 provides braking power, the clutch 46 is engaged, and the first-stage gear 47 of the liquid storage is connected to the power-assisted motor The output shaft of 44 converts the rotary motion of the output shaft of the booster motor 44 into storage through the liquid storage secondary gear 48, the liquid storage transmission gear 49, the liquid storage screw nut 50, the liquid storage ball screw 51 and the liquid storage piston rod 52. The linear movement of the liquid piston rod 52 exerts a force on the piston of the liquid storage cylinder 4, and drives the piston in the liquid storage cylinder 3 to move to the left. The axle brake fluid enters the fluid storage cylinder 4 to realize decoupling.

In the integrated decoupled electric power-assisted braking system suitable for regenerative braking, when the power-assisted motor 44 fails, the brake pedal push rod 54 directly pushes the feedback disc 41 after overcoming the idle stroke to perform manual braking.

Referring to Fig. 4, when the integrated decoupling electric power-assisted braking system suitable for regenerative braking according to the present invention is judged as normal braking and ABS braking working conditions, the front axle isolation valve 7 is in the right position, that is, the front axle isolation valve 7 is in the right position, that is, the The P and A ports of the shaft isolation valve are connected, and the reversing valve 6 is located in the left position, that is, the P and A ports of the reversing valve 6 are connected, the rear axle isolation valve 5 is connected, and the front axle suction valve 13 and the rear axle suction valve 30 are disconnected. , the clutch 46 is disengaged, so that the liquid storage primary gear 47 is separated from the output shaft of the booster motor 44, and the booster motor 44 only acts as a brake booster, without pedal decoupling, and the brake fluid is isolated from the brake master cylinder 3 through the front axle Valve 7, rear axle isolation valve 5, left front wheel booster valve 15, right front wheel booster valve 18, right rear wheel booster valve 32, left rear wheel booster valve 36 enter the brake wheel cylinder, left front wheel booster Pressure valve 15, right front wheel booster valve 18, right rear wheel booster valve 32 and left rear wheel booster valve 35 are fully connected to increase wheel cylinder pressure. The high-speed opening and closing of the pressure valve is used to realize boosting, pressure maintaining, and decompression. These two processes do not involve regenerative braking. Exit regenerative braking mode.

Referring to Fig. 5, when the integrated decoupled electric power-assisted braking system suitable for regenerative braking according to the present invention is judged to be in the ESP braking condition, the front axle isolation valve 7 is in the neutral position, that is, the front axle isolation valve 7 Ports P, A, and B of the reversing valve 6 are not connected to each other, and the reversing valve 6 is in the left position, that is, the P and A ports of the reversing valve 6 are connected, the front axle suction valve 13 and the rear axle suction valve 30 are disconnected, and the clutch 46 is separated, so that The liquid storage primary gear 47 is separated from the output shaft of the booster motor 44, and the booster motor 44 only acts as a brake booster without pedal decoupling. The brake fluid is sucked from the brake master cylinder 3 through the front axle suction valve 13 and the rear axle Valve 30, front axle plunger pump 9 and rear axle plunger pump 26, No. 1 check valve 10 and No. 4 check valve 27, front axle damper 11 and rear axle damper 28, left front wheel booster valve 15 , the right front wheel booster valve 18, the right rear wheel booster valve 32, the left rear wheel booster valve 36 enter the brake wheel cylinder, the system can rely on the left front wheel booster valve 15, the right front wheel booster valve 18, the right Rear wheel boost valve 32, left rear wheel boost valve 35, left front wheel pressure reducing valve 20, right front wheel pressure reducing valve 21, right rear wheel pressure reducing valve 37, left rear wheel pressure reducing valve 38, front axle accumulator Energy device 16 and rear axle accumulator 33 realize ESP braking, and this process does not have regenerative braking to participate in, if regenerative braking operating condition is going on when judging as ESP braking operating condition, then should exit regenerative braking operating condition.

Referring to Fig. 6, when the integrated decoupling electric power-assisted braking system suitable for regenerative braking according to the present invention is judged to be under the condition that the intensity of regenerative braking is enhanced and the maximum value is not reached, the front axle isolation valve 7 is located on the left position, that is, the P and B ports of the front axle isolation valve 7 are connected, the rear axle isolation valve 5 is disconnected, the reversing valve 6 is in the left position, that is, the P and A ports of the reversing valve 6 are connected, the front axle suction valve 13, the rear axle The shaft suction valve 30 is disconnected, and the clutch 46 is engaged, so that the liquid storage primary gear 47 is engaged with the output shaft of the booster motor 44, and the power of the booster motor 44 passes through the clutch 46, the liquid storage primary gear 47, the liquid storage secondary gear 48, The liquid storage transmission gear 49, the liquid storage screw nut 50 and the liquid storage ball screw 51 act on the liquid storage piston rod 52. During this process, the rotational motion of the output shaft of the booster motor 44 is converted into the linear motion of the liquid storage piston rod 52. , since the booster motor 44 to the booster ball screw 43 is a two-stage gear transmission, and the booster motor 44 to the liquid storage ball screw 51 is a three-stage gear transmission, the linear motion direction of the brake push rod 53 and the liquid storage piston rod 52 is opposite. Therefore, when the booster motor 44 pushes the first piston and the second piston in the brake master cylinder 3 to move to the left to release the brake hydraulic pressure, the liquid storage piston rod 52 moves to the right, so that the volume of the liquid storage cylinder 4 increases, and the brake The liquid enters the liquid storage cylinder 4 through the front axle isolation valve 7 and the reversing valve 6. Through the design of the gear transmission ratio and the effective area of the piston of the liquid storage cylinder 4, the volume increase of the liquid storage cylinder 4 is equal to the braking force in the brake master cylinder 3. The amount of fluid removed is equal, and its value is controlled according to the brake control strategy in the brake ECU. Since the brake fluid removed from the brake master cylinder 3 enters the fluid storage cylinder 4, the hydraulic pressure of the wheel cylinder of the drive shaft wheel does not increase, and the drive The axle wheels do not generate braking force, and the pedal decoupling during regenerative braking is realized. At this time, because the rear axle isolation valve 5 is disconnected, the rear axle does not generate braking force either.

Referring to Fig. 7, when the integrated decoupling electric power-assisted braking system suitable for regenerative braking according to the present invention is judged to be in the condition of maintaining the strength of regenerative braking, the front axle isolation valve 7 is in the right position, that is, the front axle isolating The P and A ports of the valve 7 are connected, the rear axle isolation valve 5 is connected, the reversing valve 6 is located in the left position, that is, the P and A ports of the reversing valve 6 are connected, the front axle suction valve 13 and the rear axle suction valve 30 are disconnected, When the clutch 46 is disengaged, the power booster motor 44 only acts as a brake booster, and the brake fluid in the liquid storage cylinder 4 continues to be stored therein. Since the clutch 46 is disengaged, the left side of the piston in the liquid storage cylinder 4 is braked in the liquid storage cylinder 4. The right side becomes the free end due to the hydraulic action of the hydraulic fluid, but due to the action of the spring on the right side in the fluid storage cylinder 4, the position of the piston in the fluid storage cylinder 4 remains unchanged. As the braking strength increases, the piston of the brake master cylinder 3 continues to Move to the left to release the brake fluid, and the newly extruded brake fluid passes through the front axle isolation valve 7, the rear axle isolation valve 5, the left front wheel booster valve 15, the right front wheel booster valve 18, and the right rear wheel booster valve 32. The booster valve 35 of the left rear wheel enters the left front wheel cylinder 22, the right front wheel cylinder 23, the right rear wheel cylinder 24, and the left rear wheel cylinder 25. The wheels increase the braking force, but the regenerative braking intensity remains constant. Change.

Referring to Fig. 8, when the integrated decoupling electric power-assisted braking system suitable for regenerative braking according to the present invention is judged to be under the condition that the intensity of regenerative braking is reduced and the total braking intensity is constant, the front axle isolation valve 7 In the right position, that is, the P and A ports of the front axle isolation valve 7 are connected, the rear axle isolation valve 5 is disconnected, the reversing valve 6 is in the right position, that is, the A and B ports of the reversing valve 6 are connected, and the front axle suction valve 13 , The rear axle suction valve 30 is disconnected, the clutch 46 is disengaged, the front axle plunger pump 9 works, and the brake fluid in the liquid storage cylinder 4 passes through the reversing valve 6, the decoupling check valve 8, and the front axle plunger pump 9 , No. 1 one-way valve 10, front axle damper 11, left front wheel booster valve 15, right front wheel booster valve 18 are pumped into the left front wheel cylinder 22 and the right front wheel cylinder 23, along with the liquid storage cylinder The brake fluid in 4 is reduced, and the piston in the storage cylinder 4 moves to the left under the action of the spring, and the maximum can reach the left limit position. The reduction of the brake fluid in the storage cylinder 4 is determined by the regenerative braking strength determined by the braking control strategy In this process, no new brake fluid is removed from the brake master cylinder 3, and the brake fluid removed from the liquid storage cylinder 4 enters the drive shaft brake wheel cylinder, and the reduction of regenerative braking strength is controlled by the drive shaft wheel This is supplemented by an increase in braking strength to keep the overall braking strength unchanged.

Referring to Figure 9, the integrated decoupling electric power-assisted braking system suitable for regenerative braking according to the present invention judges that the regenerative braking intensity is reduced and the total braking intensity is increased, that is, the driver needs to brake The strength increases, but the regenerative braking force limited by the system becomes smaller, the front axle isolation valve 7 is in the right position, that is, the P and A ports of the front axle isolation valve 7 are connected, the rear axle isolation valve 5 is connected, and the reversing valve 6 is in the right position , that is, the A and B ports of the reversing valve 6 are connected, the front axle suction valve 13 and the rear axle suction valve 30 are disconnected, the left front wheel boost valve 15, the right front wheel boost valve 18, and the right rear wheel boost valve 32 , the left rear wheel booster valve 35 are all connected, the first piston and the second piston of the brake master cylinder 3 move to the left to release the brake hydraulic pressure, and the newly pressed brake fluid passes through the front axle isolation valve 7 and the rear axle isolation valve 5. Left front wheel booster valve 15, right front wheel booster valve 18, right rear wheel booster valve 32, left rear wheel booster valve 35 enter left front wheel cylinder 22, right front wheel cylinder 23, right rear wheel cylinder The wheel cylinder 24, the left rear wheel cylinder 25, the clutch 46 is disengaged, the front axle plunger pump 9 works, and the brake fluid in the liquid storage cylinder 4 passes through the reversing valve 6, the decoupling check valve 8, the front axle column Plug pump 9, No. 1 one-way valve 10, front axle damper 11, left front wheel booster valve 15, right front wheel booster valve 18 pump into left front wheel brake cylinder 22, right front wheel brake cylinder 23. As the brake fluid in the storage cylinder 4 decreases, the piston in the storage cylinder 4 moves to the left under the action of the spring, and the maximum can reach the left limit position. The reduction of the brake fluid in the storage cylinder 4 is determined by the brake control strategy Determining the strength of regenerative braking.

Referring to Fig. 10-a, when the integrated decoupling electric power assist braking system suitable for regenerative braking according to the present invention judges that the regenerative braking intensity is reduced and the total braking intensity is reduced, that is, the driver's demand When the braking strength is reduced and the regenerative braking strength also needs to be reduced, the wheel cylinder hydraulic pressure should be reduced first, that is, the wheel cylinder hydraulic pressure braking strength should be reduced, the first piston and the second piston of the brake master cylinder 3 move to the right, and the front axle The isolation valve 7 is in the right position, that is, the P and A ports of the front axle isolation valve 7 are connected, the rear axle isolation valve 5 is connected, the reversing valve 6 is in the left position, that is, the P and A ports of the reversing valve 6 are connected, and the front axle suction Valve 13, rear axle suction valve 30 disconnected, left front wheel booster valve 15, right front wheel booster valve 18, right rear wheel booster valve 32, left rear wheel booster valve 35, left front wheel pressure reducing valve 20 , the right front wheel pressure reducing valve 21, the right rear wheel pressure reducing valve 37, and the left rear wheel pressure reducing valve 38 are all in the normal state, the front axle plunger pump 9 and the rear axle plunger pump 26 do not work, and the brake in the wheel cylinder The liquid is sent through the left front circulation fluid check valve 14, the right front circulation fluid check valve 19, the right rear circulation fluid check valve 31, the left rear circulation fluid check valve 36, the second check valve 12, and the fifth check valve 29. Back to master cylinder 3.

Referring to Fig. 10-b, the integrated decoupling electric power-assisted braking system suitable for regenerative braking according to the present invention judges that the regenerative braking intensity is reduced and the total braking intensity is reduced, that is, the driver's demand When the braking strength is reduced and the regenerative braking strength also needs to be reduced, after the wheel cylinder hydraulic pressure drops to zero, the brake fluid in the liquid storage cylinder 4 is pumped back into the brake master cylinder 3 to reduce the regenerative braking strength At this time, the front axle isolation valve 7 is in the right position, that is, the P and A ports of the front axle isolation valve 7 are connected, the rear axle isolation valve 5 is connected, and the reversing valve 6 is in the right position, that is, the A and B ports of the reversing valve 6 are connected. Connected, front axle suction valve 13, rear axle suction valve 30 disconnected, left front wheel booster valve 15, right front wheel booster valve 18, right rear wheel booster valve 32, left rear wheel booster valve 35, left front wheel booster valve The wheel pressure reducing valve 20, the right front wheel pressure reducing valve 21, the right rear wheel pressure reducing valve 37, and the left rear wheel pressure reducing valve 38 are all in the normal state. The brake fluid is sent back to the brake master cylinder 3 through the reversing valve 6, decoupling check valve 8, front axle plunger pump 9, No. 1 check valve 10, front axle damper 11 and No. 2 check valve 12, As the brake fluid in the liquid storage cylinder 4 decreases, the piston in the liquid storage cylinder 4 moves to the left under the action of the spring, and the clutch 46 is engaged, so that the liquid storage primary gear 47 is engaged with the output shaft of the booster motor 44, and when the brake master cylinder When the first piston and the second piston of 3 move to the right, the piston in the liquid storage cylinder 4 moves to the left, that is, the piston of the liquid storage cylinder 4 is jointly affected by the thrust of the spring and the motor during this process, and the amount of brake fluid in the liquid storage cylinder 4 is reduced by The regenerative braking strength determined by the braking control strategy determines that the 4 pistons of the fluid storage cylinder can reach the left limit position as far as possible.

Claims (6)

1. An integrated decoupling electric power-assisted braking system suitable for regenerative braking, characterized in that the integrated decoupled electric power-assisted braking system suitable for regenerative braking includes a brake pedal (1), integrated electric booster mechanism (2), brake master cylinder (3), fluid storage cylinder (4), hydraulic system, left front wheel cylinder (22), right front wheel cylinder (23), right Rear wheel cylinder (24), left rear wheel cylinder (25) and liquid storage tank (55); The hydraulic system includes a front axle hydraulic system and a rear axle hydraulic system; The front axle hydraulic system also includes decoupling check valve (8), No. 1 check valve (10), front axle damper (11), No. 2 check valve (12), front axle suction valve (13 ), left front wheel fluid return check valve (14), left front wheel booster valve (15), front axle accumulator (16), No. 3 check valve (17), right front wheel booster valve (18) and Right front circulation liquid check valve (19); The P port of the reversing valve (6) is connected to the B port of the front axle isolation valve (7), and the B port of the reversing valve (6) is connected to the oil inlet pipeline of the decoupling check valve (8). Decoupling the oil outlet of the check valve (8) and the oil inlet of the front axle plunger pump (9), the oil outlet of the No. 3 check valve (17) and the first oil port pipe of the front axle suction valve (13) The P port of the front axle isolation valve (7) and the other oil port of the front axle suction valve (13) are connected with the oil outlet pipeline of the No. 2 check valve (12), and the port of the front axle isolation valve (7) A port and the P port of the left front wheel booster valve (15), the P port of the right front wheel booster valve (18), the oil outlet of the left front wheel return fluid check valve (14), the right front wheel return fluid check valve ( 19), one end of the front axle damper (11) is connected to the oil inlet pipeline of the No. 2 check valve (12); the outlet end of the front axle plunger pump (9) is connected to the No. The oil inlet pipeline is connected, the oil outlet of the No. 1 one-way valve (10) is connected with the other end pipeline of the front axle damper (11), the A port of the left front wheel booster valve (15) and The oil inlet of the left front circulation fluid check valve (14) is connected with the oil port one of the left front wheel decompression valve (20), and the A port of the right front wheel booster valve (18) is connected with the right front circulation fluid check valve. The liquid inlet port of (19) is connected with an oil port of the right front wheel pressure reducing valve (21), and the other oil port of the left front wheel pressure reducing valve (20) is connected with the oil port of the right front wheel pressure reducing valve (21). The other oil port and one end of the front axle accumulator (16) are connected with the oil inlet pipeline of No. 3 check valve (17); The rear axle hydraulic system also includes a rear axle isolation valve (5), a No. 4 check valve (27), a rear axle damper (28), a No. 5 check valve (29), a rear axle suction valve (30) , Right rear circulation fluid one-way valve (31), left rear circulation fluid one-way valve (36), right rear wheel booster valve (32), left rear wheel booster valve (35), rear axle accumulator (33 ) and No. six check valve (34); Port P of the rear axle isolation valve (5) and an oil port of the rear axle suction valve (30) are connected to the oil outlet pipeline of the No. 5 one-way valve (29), and the rear axle isolation valve (5) Port A and the oil inlet of the No. 5 check valve (29), the left end of the rear axle damper (28), the oil outlet of the right rear circulation fluid check valve (31), the left rear circulation fluid check valve (36 ), the P port of the right rear wheel booster valve (32) is connected with the P port pipeline of the left rear wheel booster valve (35); the oil inlet of the rear axle plunger pump (26) and the rear axle The other oil port of the suction valve (30) is connected to the oil outlet pipeline of the No. 6 check valve (34), and the oil outlet of the rear axle plunger pump (26) is connected to the oil inlet of the No. The oil outlet of the No. 4 check valve (27) is connected with the right end pipeline of the rear axle damper 28; the A port of the right rear wheel booster valve (32) is connected with the right rear circulation fluid check valve ( The oil inlet of 31) is connected with an oil port pipeline of the right rear wheel decompression valve (37), and the A port of the left rear wheel booster valve (35) is connected with the oil inlet of the left rear wheel fluid check valve (36). The oil port of the left rear wheel pressure reducing valve (38) is connected with the pipeline, and the other oil port of the right rear wheel pressure reducing valve (37) is connected with the other port of the left rear wheel pressure reducing valve (38) and the rear axle One end of the accumulator (33) is connected with the oil inlet pipeline of the No. 6 check valve (34); The right end of the liquid storage piston rod (52) of the liquid storage cylinder (4) is loaded into the integrated electric power booster (2) from the N port of the integrated electric power booster (2), and fixed to the integrated power booster with bolts. On the right side wall of the liquid storage ball screw (51) of the electric power assist mechanism (2), the left end port of the liquid storage cylinder (4) is connected to the A-port pipeline of the reversing valve (6) of the front axle hydraulic system, integrated The right end of the brake pedal push rod (54) of the integrated electric power booster mechanism (2) is connected to the brake pedal (1), and the brake push rod (53) of the integrated electric power booster mechanism (2) is connected to the brake master cylinder (3 ), the right end face of the first piston in the brake master cylinder (3) is connected to the right end surface of the brake master cylinder (3), and the oil supply port on the brake master cylinder (3) is connected to the pipeline of the liquid storage tank (55), and the oil port of the second chamber of the brake master cylinder (3) It is connected with the P port pipeline of the front axle isolating valve (7) in the front axle hydraulic system; the oil port of the first chamber of the brake master cylinder (3) is connected with the rear axle isolating valve (5) in the rear axle hydraulic system The P port pipeline connection of the front axle hydraulic system; the left front wheel pressure reducing valve (20) and the right front wheel pressure reducing valve (21) in the front axle hydraulic system are respectively connected to the left front wheel cylinder (22) and the right front wheel wheel Cylinder (23) pipeline connection, the right rear wheel decompression valve (37) and one interface of left rear wheel decompression valve (38) in the rear axle hydraulic system respectively and the right rear wheel cylinder (24) and left rear wheel The wheel cylinder (25) pipeline is connected, and the front axle plunger pump (9) in the hydraulic system is connected with the left and right output ends of the same motor with the rear axle plunger pump (26) respectively. 2. The integrated decoupling electric power-assisted braking system suitable for regenerative braking according to claim 1, characterized in that the integrated electric power-assisted mechanism (2) includes No. 1 electric power-assisted mechanism, No. 2 Electric booster mechanism and transmission mechanism; The transmission mechanism includes a booster transmission gear (39), a booster motor (44), a motor pinion (45), a clutch (46), a liquid storage primary gear (47), a liquid storage secondary gear (48) and a storage Hydraulic transmission gear (49); The booster transmission gear (39) is set and fixedly connected to the booster lead screw nut (40) of the No. 1 electric booster mechanism with a key, and the motor pinion (45) is installed on the output shaft of the booster motor (44) through a key , the motor pinion (45) is externally meshed with the booster transmission gear (39); The clutch (46) connects the output shaft of the liquid storage primary gear (47) and the booster motor (44). The liquid storage primary gear (47) is externally meshed with the liquid storage secondary gear (48) arranged up and down. The stage gear (48) is externally engaged with the liquid storage transmission gear (49) arranged up and down, and the liquid storage transmission gear (49) suits and adopts a key to be fixedly connected on the liquid storage leading screw nut (50) of No. 2 electric booster mechanism. 3. The integrated decoupling electric power-assisted braking system suitable for regenerative braking according to claim 2, characterized in that the No. 1 electric power-assisted mechanism includes a power-assisted screw nut (40), a feedback disc ( 41), booster valve body (42), booster ball screw (43), brake push rod (53) and brake pedal push rod (54); The booster valve body (42) is installed inside the booster ball screw (43), and the brake pedal push rod (54) is inserted into the power booster through the center right through hole of the booster ball screw (43) and the booster valve body (42). The inner cavity of the valve body (42) is inserted into the left through hole of the booster valve body (42), but a gap of 2 to 3 mm is reserved from the left through hole, and the right side wall of the booster valve body (42) is in contact with the booster valve body (42). The inner wall surface of the right side wall of the ball screw (43) is in contact; the booster ball screw (43) with the booster valve body (42) installed in the booster screw nut (40), the booster ball screw (43) and The balls of the booster ball screw are between the booster screw nuts (40); the disc-shaped feedback disc (41) is installed on the left side of the inner cavity of the booster valve body (42), and the right end surface of the feedback disc (41) is in contact with the booster The left end surface of the built-in torus-shaped boss on the left side of the valve body (42) is in contact, and the left end surface of the feedback disc (41) is in contact with the right end surface of the push rod (53). 4. The integrated decoupling electric power-assisted braking system suitable for regenerative braking according to claim 3, characterized in that, the booster valve body (42) is a hollow cylindrical structural member, and the booster valve The outer diameter of the body (42) is the same as the inner diameter of the booster ball screw (43), and the center of the right side wall of the booster valve body (42) is provided with a central right through hole, and the left side is an open type, but a built-in cross section is Rectangular ring-shaped boss, the center of the ring-shaped boss is provided with a left through hole, the left through hole and the right through hole have the same aperture, and the rotation axes of the left through hole and the right through hole are the same as the booster valve body. (42) axis of revolution coincides. 5. The integrated decoupling electric power-assisted braking system suitable for regenerative braking according to claim 2, characterized in that the No. 2 electric power-assisted mechanism includes a liquid storage lead screw nut (50) and a liquid storage Ball screw (51); The liquid storage ball screw (51) is a hollow structural member, the right end of the liquid storage ball screw (51) is provided with a right side wall, and there are three evenly distributed on the right side wall along the axial direction from its outer surface. The through hole opened inside, the through hole on the right side wall of the liquid storage ball screw (51) is opposite to the threaded blind hole on the right end boss of the liquid storage piston rod (52), that is, the right side of the liquid storage ball screw (51) The through hole on the side wall is in line with the axis of rotation of the threaded blind hole on the boss at the right end of the liquid storage piston rod (52); The outer diameters are equal, the storage ball screw (51) with the storage piston rod (52) installed in the storage screw nut (50), the storage ball screw (51) and the storage screw nut ( 50) are the balls of the liquid storage ball screw. 6. The integrated decoupling electric power-assisted braking system suitable for regenerative braking according to claim 1, characterized in that, the liquid storage cylinder (4) includes a liquid storage cylinder body, a liquid storage piston rod ( 52) with a spring; The left end of the liquid storage piston rod (52) is a piston whose diameter is equal to the inner diameter of the liquid storage cylinder, and the right end is a push rod whose diameter is equal to the inner diameter of the central through hole on the right end cylinder wall of the liquid storage cylinder. The right end of the push rod is provided with a cylindrical boss, the diameter of which is equal to the inner diameter of the liquid storage ball screw (51) in the integrated electric booster mechanism (2), and the right end of the boss is provided with three utilization points evenly distributed along the axial direction. The bolt fixes the liquid storage piston rod (52) in the threaded blind hole on the right side wall of the liquid storage ball screw (51); The liquid storage piston rod (52) is packed into the liquid storage cylinder body, and the liquid storage piston rod (52) is slidingly connected with the liquid storage cylinder body, and the right end of the liquid storage piston rod (52) extends from the right end of the liquid storage cylinder body. out, the spring is set on the push rod in the liquid storage piston rod (52), the right end surface of the spring is in contact with the right side of the left end piston of the liquid storage piston rod (52), and the right end surface of the spring is fixed on the right end of the liquid storage cylinder on the inner wall.

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