CN217099941U

CN217099941U - Electronic hydraulic brake system

Info

Publication number: CN217099941U
Application number: CN202220207841.XU
Authority: CN
Inventors: 许辉
Original assignee: Shanghai Likeng Technology Co ltd
Current assignee: Shanghai Likeng Technology Co ltd
Priority date: 2022-01-25
Filing date: 2022-01-25
Publication date: 2022-08-02
Anticipated expiration: 2032-01-25

Abstract

An electronic hydraulic brake system comprises an oil can, a double-cavity main cylinder, a simulation main cylinder, a driving mechanism, a pedal simulator, a first pressure sensor, a stroke sensor, a first normally-open valve, a first pipeline, a second pipeline, a third pipeline, a fourth pipeline and a control unit, wherein the oil can is respectively connected with the double-cavity main cylinder and the simulation main cylinder; the first pipeline and the second pipeline are connected with the double-cavity master cylinder; the third pipeline is connected between the second pipeline and the simulation master cylinder, and the first normally open valve and the first pressure sensor are connected to the third pipeline; the fourth pipeline is connected between the simulation master cylinder and the pedal simulator; the control unit is respectively and electrically connected with the driving mechanism, the stroke sensor, the first pressure sensor and the first normally open valve. The utility model discloses an electronic hydraulic braking system can guarantee to brake the feel.

Description

Electronic hydraulic brake system

Technical Field

The utility model relates to a braking technical field, in particular to electronic hydraulic braking system.

Background

With the popularization of automobile electromotion and unmanned driving, an automobile brake system loses a convenient vacuum source, so a vacuum booster needs to be cancelled; in addition, the unmanned braking requirement puts higher requirements on the active braking performance and the service life of the system, so that an electronic stability control system (ESC) which is commonly used at present cannot meet the requirements, a new generation of brake-by-wire system is promoted to be generated and gradually popularized, and the most basic brake-by-wire system of an electronic booster is more and more applied.

The electronic boosters on the market mainly comprise the following components: one is based on the simplified version of Onebox, and its brake master cylinder and other hydraulic components are concentrated on an aluminum block. Although the system has better performance, the price is higher, and the popularization is difficult; moreover, when the ESC is externally connected and the ESC is actively pressurized, the system damping is large, and the ESC works; and secondly, the brake master cylinder is based on an independent traditional master cylinder, but when the motor fails, a driver needs to overcome a certain idle stroke to generate braking force, so that the braking distance is prolonged, the reaction time is prolonged, and the confidence of the driver is seriously reduced.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides an electronic hydraulic brake system, which can ensure the brake feel and avoid the problem of too long brake stroke in the backup mode.

An electronic hydraulic brake system comprises an oil can, a double-cavity main cylinder, a simulation main cylinder, a driving mechanism, a pedal simulator, a first pressure sensor, a stroke sensor, a first normally-open valve, a first pipeline, a second pipeline, a third pipeline, a fourth pipeline and a control unit, wherein the oil can is respectively connected with the double-cavity main cylinder and the simulation main cylinder; the first pipeline and the second pipeline are connected with the double-cavity master cylinder and used for outputting hydraulic pressure; one end of a third pipeline is connected with the second pipeline, the other end of the third pipeline is connected with the simulation master cylinder, and the first normally open valve and the first pressure sensor are connected to the third pipeline; the fourth pipeline is connected between the simulation master cylinder and the pedal simulator; the control unit is respectively and electrically connected with the driving mechanism, the stroke sensor, the first pressure sensor and the first normally open valve, and is used for controlling the driving mechanism to be started or closed and controlling the first normally open valve to be powered on or powered off.

The embodiment of the utility model provides an in, above-mentioned electronic hydraulic braking system still includes second pressure sensor and position sensor, second pressure sensor connects on the second pipeline, position sensor is used for detecting actuating mechanism's actuating position, second pressure sensor position sensor all with the control unit electric connection.

The embodiment of the present invention provides an embodiment, the above-mentioned electronic hydraulic brake system further includes a first liquid inlet pipe, a second liquid inlet pipe, a third liquid inlet pipe and a second normally open valve, the first liquid inlet pipe with the second liquid inlet pipe connect in the oilcan with between the two-chamber master cylinder, the third liquid inlet pipe connect in the oilcan with between the simulation master cylinder, the second normally open valve connect in on the third liquid inlet pipe, the second normally open valve with the control unit electric connection, the control unit is used for controlling the second normally open valve to get or lose power.

The utility model discloses an in the embodiment, above-mentioned electronic hydraulic braking system still includes fifth pipeline and first check valve, the feed liquor end of fifth pipeline with go out the liquid end all with the third inlet tube is connected, first check valve is located the fifth pipeline the feed liquor end with go out between the liquid end, first check valve is connected on the fifth pipeline

The utility model discloses an in the embodiment, above-mentioned the control unit includes the self-checking circuit, the self-checking circuit can be according to the leakproofness of the signal determination system return circuit that first pressure sensor with second pressure sensor gathered.

In an embodiment of the present invention, the electronic hydraulic brake system further includes a damper, and the damper is connected to the fourth pipe.

The utility model discloses an in the embodiment, above-mentioned electronic hydraulic braking system still includes sixth pipeline and second check valve, the feed liquor end of sixth pipeline with go out the liquid end all with the fourth tube coupling, the attenuator is located the sixth pipeline the feed liquor end with go out between the liquid end, the second check valve is connected on the sixth pipeline.

In an embodiment of the present invention, the above-mentioned electronic hydraulic braking system further includes a plurality of wheel cylinders or ABS/ESC, and the liquid outlet end of the first pipeline and the second pipeline is connected with a plurality of wheel cylinders or ABS/ESC respectively.

The utility model discloses an in the embodiment, above-mentioned two-chamber master cylinder includes first master cylinder, first drive shaft and installs first piston, second piston, first spring and second spring in the first master cylinder, first piston with the mutual interval setting of second piston, first spring coupling in the inner wall of first master cylinder with between the first piston, second spring coupling in first piston with between the second piston, the one end movably of first drive shaft is connected in the second piston, the other end of first drive shaft passes first master cylinder and with actuating mechanism connects.

The utility model discloses a pedal simulator of electronic hydraulic braking system can perfectly simulate out the feel that the driver needs and do not produce the side effect, has overcome non-decoupling zero formula and mechanical decoupling zero formula braking feel poor problem, has both guaranteed the braking feel, has avoided the too long problem of braking stroke under the backup mode again, is favorable to increasing driver's confidence. And the utility model discloses an electronic hydraulic braking system simple structure, the design cost is low, promotes easily.

Drawings

Fig. 1 is a schematic structural diagram of an electro-hydraulic brake system of the present invention;

fig. 2 is a schematic view of the electronic hydraulic brake system according to the present invention during normal braking;

fig. 3 is a schematic diagram of the backup brake operating state of the electro-hydraulic brake system of the present invention;

fig. 4 is a schematic diagram of a first self-checking operating state of the electro-hydraulic brake system of the present invention;

fig. 5 is a schematic diagram of a second self-checking operating state of the electronic hydraulic brake system of the present invention.

Detailed Description

The utility model provides an electronic hydraulic braking system.

In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

In order to facilitate understanding of those skilled in the art, the present invention provides a specific implementation process of the technical solution provided by the present invention through the following embodiments.

Fig. 1 is a schematic structural diagram of an electronic hydraulic brake system of the present invention, as shown in fig. 1, the electronic hydraulic brake system includes an oil can 11, a dual-chamber master cylinder 12, a simulation master cylinder 14, a driving mechanism 15, a pedal 16, a pedal simulator 17, a first pressure sensor 18, a stroke sensor 19, a first normally open valve 20, a first pipeline 21, a second pipeline 22, a third pipeline 23, a fourth pipeline 24 and a control unit (not shown), wherein:

the oil pot 11 is respectively connected with the dual-cavity master cylinder 12 and the simulation master cylinder 14, the driving mechanism 15 of the dual-cavity master cylinder 12 is connected with the dual-cavity master cylinder 12, the pedal 16 is connected with the simulation master cylinder 14, and the stroke sensor 19 is used for detecting the moving stroke of the pedal 16;

a first line 21 and a second line 22 are connected to the dual chamber master cylinder 12, the first line 21 and the second line 22 being used for outputting hydraulic pressure;

one end of a third pipeline 23 is connected with the second pipeline 22, the other end of the third pipeline 23 is connected with the simulation master cylinder 14, and the first normally open valve 20 and the first pressure sensor 18 are connected on the third pipeline 23;

the fourth pipeline 24 is connected between the simulation master cylinder 14 and the pedal simulator 17;

the control unit is respectively electrically connected with the driving mechanism 15, the stroke sensor 19, the first pressure sensor 18 and the first normally open valve 20, and is used for controlling the driving mechanism 15 to be started or closed and controlling the first normally open valve 20 to be powered on or powered off; the first normally open valve 20 is energized to block the third conduit 23 and the first normally open valve 20 is de-energized to conduct the third conduit 23.

When the electronic hydraulic brake system brakes under a normal condition (the driving mechanism 15 does not fail), the control unit controls the first normally open valve 20 to be electrified to block the third pipeline 23, the pedal 16 is stepped to drive the simulation master cylinder 14 at the moment, meanwhile, the stroke sensor 19 detects the moving stroke of the pedal 16 in real time, one part of hydraulic pressure output by the simulation master cylinder 14 reaches the first normally open valve 20 through the third pipeline 23, the fluid pressure in the third pipeline 23 is sensed by the first pressure sensor 18, the other part of hydraulic pressure output by the simulation master cylinder 14 reaches the pedal simulator 17 through the fourth pipeline 24 to realize foot feel simulation, and the control unit starts the driving mechanism 15 according to signals collected by the stroke sensor 19 and the first pressure sensor 18 so that the driving mechanism 15 drives the dual-cavity master cylinder 12 to realize the hydraulic output of the first pipeline 21 and the second pipeline 22.

When the electronic hydraulic brake system brakes in a first backup working state (the driving mechanism 15 fails), the control unit controls the first normally open valve 20 to lose power and conduct the third pipeline 23, the pedal 16 is stepped on at the moment to further drive the simulation main cylinder 14, the simulation main cylinder 14 outputs hydraulic pressure, and a part of the hydraulic pressure drives the dual-cavity main cylinder 12 through the third pipeline 23 and the second pipeline 22, so that hydraulic pressure output of the first pipeline 21 and the second pipeline 22 is realized; another part of the hydraulic pressure reaches the pedal simulator 17 through a fourth conduit 24, and the foot feeling simulation is realized.

The utility model discloses a pedal simulator 17 of electronic hydraulic braking system can perfectly simulate out the feel that the driver needs and not produce the side effect, has overcome non-decoupling zero formula and mechanical decoupling zero formula braking feel poor problem, has both guaranteed the braking feel, has avoided the too long problem of braking stroke under the backup mode again, is favorable to increasing driver's confidence. And the utility model discloses an electronic hydraulic braking system simple structure, the design cost is low, promotes easily.

Optionally, the electronic hydraulic brake system further includes a second pressure sensor 25 and a position sensor 26, the second pressure sensor 25 is connected to the second pipeline 22, the position sensor 26 is used for detecting the driving position of the driving mechanism 15, and both the second pressure sensor 25 and the position sensor 26 are electrically connected to the control unit. In this embodiment, the control unit may control the power, activation, or deactivation of the driving mechanism 15 in real time based on the signals detected by the second pressure sensor 25 and the position sensor 26.

Optionally, the electronic hydraulic brake system further includes a first liquid inlet pipe 27, a second liquid inlet pipe 28, a third liquid inlet pipe 29 and a second normally-open valve 30, the first liquid inlet pipe 27 and the second liquid inlet pipe 28 are connected between the oil can 11 and the dual-cavity master cylinder 12, the third liquid inlet pipe 29 is connected between the oil can 11 and the simulation master cylinder 14, the second normally-open valve 30 is connected to the third liquid inlet pipe 29, the second normally-open valve 30 is electrically connected to the control unit, the control unit is configured to control the second normally-open valve 30 to be powered on or powered off, the second normally-open valve 30 is powered on and blocks the third liquid inlet pipe 29, and the second normally-open valve 30 is powered off and conducts the third liquid inlet pipe 29.

It should be mentioned that, the utility model discloses an even the unable work of breaking down all appears in first normally open valve 20 and second normally open valve 30 in the electronic hydraulic braking system, also can guarantee backup operating condition's braking effect, first normally open valve 20 and second normally open valve 30 can't work promptly, and third pipeline 23 and third inlet pipe 29 all are in the on-state this moment.

Optionally, the electronic hydraulic brake system further includes a fifth pipeline 31 and a first check valve 32, a liquid inlet end and a liquid outlet end of the fifth pipeline 31 are both connected to the third liquid inlet pipe 29, the first check valve 32 is located between the liquid inlet end and the liquid outlet end of the fifth pipeline 31, and the first check valve 32 is connected to the fifth pipeline 31.

Optionally, the control unit comprises a self-test circuit (not shown) which determines the tightness of the system circuit on the basis of the signals collected by the first pressure sensor 18 and the second pressure sensor 25.

When the control unit controls the driving mechanism 15 to start and controls the first normally open valve 20 to be powered on, the self-detection circuit determines the tightness of the loop formed by the dual-chamber master cylinder 12, the wheel cylinder and the first normally open valve 20 according to the signal collected by the second pressure sensor 25, that is, when the pressure value detected by the second pressure sensor 25 is within the set pressure interval, the loop formed by the dual-chamber master cylinder 12, the wheel cylinder and the first normally open valve 20 is not leaked, otherwise, the loop is leaked.

When the control unit controls the driving mechanism 15 to be started, controls the first normally-open valve 20 to be powered off and controls the second normally-open valve 30 to be powered on, the self-detection circuit determines the tightness of a loop formed by the dual-chamber master cylinder 12, the simulated master cylinder 14, the wheel cylinder and the second normally-open valve 30 according to signals collected by the first pressure sensor 18 and the second pressure sensor 25, namely when pressure values detected by the first pressure sensor 18 and the second pressure sensor 25 are within a set pressure interval, the loop formed by the dual-chamber master cylinder 12, the simulated master cylinder 14, the wheel cylinder and the second normally-open valve 30 does not leak, and otherwise, the loop leaks.

Optionally, the electro-hydraulic brake system further comprises a damper 33, the damper 33 being connected to the fourth line 24. In the present embodiment, the damper 33 is used to increase the fluid damping, which is advantageous to increase the feeling of the foot during automation.

Optionally, the electronic hydraulic brake system further includes a sixth pipeline 34 and a second check valve 35, the liquid inlet end and the liquid outlet end of the sixth pipeline 34 are both connected to the fourth pipeline 24, the damper 33 is located between the liquid inlet end and the liquid outlet end of the sixth pipeline 34, and the second check valve 35 is connected to the sixth pipeline 34. When the driver steps on the pedal 16 to drive the simulation master cylinder 14, the brake fluid cannot pass through the second check valve 35; when the driver releases the pedal 16, the brake fluid in the pedal simulator 17 may flow back to the simulation master cylinder 14 through the second check valve 35; the second check valve 35 helps the brake fluid to be quickly retracted when the driver releases the pedal 16.

Optionally, the electronic hydraulic brake system further comprises a plurality of wheel cylinders or ABS/ESC36, and the liquid outlet ends of the first pipeline 21 and the second pipeline 22 are respectively connected with the plurality of wheel cylinders or ABS/ESC 36. When the first pipeline 21 and the second pipeline 22 are in butt joint with an ESC (electronic stability control system), the system can ensure the active pressurization capacity of the ESC.

Optionally, the dual-chamber master cylinder 12 includes a first master cylinder 121, a first driving shaft 122, and a first piston 123, a second piston 124, a first spring 125 and a second spring 126 which are installed in the first master cylinder 121, the first piston 123 and the second piston 124 are disposed at an interval, the first spring 125 is connected between an inner wall of the first master cylinder 121 and the first piston 123, the second spring 126 is connected between the first piston 123 and the second piston 124, one end of the first driving shaft 122 is movably connected to the second piston 124, and the other end of the first driving shaft 122 passes through the first master cylinder 121 and is connected to the driving mechanism 15. In this embodiment, the first liquid inlet pipe 27 and the second liquid inlet pipe 28 are respectively communicated with two chambers of the first main cylinder 121, and the oil can 11 supplies the liquid to the dual-chamber main cylinder 12 through the first liquid inlet pipe 27 and the second liquid inlet pipe 28.

Alternatively, the driving mechanism 15 includes a motor 151, an output shaft 152, and a linkage assembly 153, the output shaft 152 being connected to the motor 151, and the linkage assembly 153 being connected between the first driving shaft 122 and the output shaft 152. In other embodiments, the drive mechanism 15 comprises a cylinder or an air cylinder.

Alternatively, the dummy master cylinder 14 includes a second master cylinder 141, a second driving shaft 142, and a third piston 143 and a third spring 144 installed in the second master cylinder 141, the third piston 143 is slidably installed in the second master cylinder 141, one end of the third spring 144 is connected to an inner wall of the second master cylinder 141, the other end of the third spring 144 is connected to the third piston 143, one end of the second driving shaft 142 is movably connected to a side of the third piston 143 away from the third spring 144, and the other end of the second driving shaft 142 passes through the second master cylinder 141 and is connected to the pedal 16.

Optionally, the electro-hydraulic brake system further includes a stop lamp switch 37, and the stop lamp switch 37 and the stroke sensor 19 are connected to the second drive shaft 142. When the driver steps on the pedal 16 to move the second driving shaft 142 and the second piston 124, the stop lamp switch 37 is turned on to provide a braking start signal to other systems, and the stroke sensor 19 detects the stroke of the second driving shaft 142 in real time.

Optionally, a movable chamber is provided in the pedal simulator 17, and a sliding plate and a spring are installed in the movable chamber to simulate the feeling of feet.

Fig. 2 is the utility model discloses a schematic diagram of electronic hydraulic braking system during normal braking, fig. 3 is the utility model discloses a backup brake operating condition's of electronic hydraulic braking system schematic diagram, as shown in fig. 2 and fig. 3, the utility model discloses still provide an electronic hydraulic braking method, electronic hydraulic braking method is used for foretell electronic hydraulic braking system, electronic hydraulic braking method includes:

when the drive mechanism 15 is not disabled:

controlling the first normally open valve 20 to be electrified and blocking the third pipeline 23;

the pedal 16 is stepped to drive the simulation master cylinder 14, the control unit starts the driving mechanism 15 according to signals detected by the first pressure sensor 18 and the stroke sensor 19, and the driving mechanism 15 drives the dual-cavity master cylinder 12 to enable the first pipeline 21 and the second pipeline 22 to output hydraulic pressure;

when the drive mechanism 15 fails:

controlling the first normally open valve 20 to lose power to conduct the third pipeline 23;

when the pedal 16 is depressed, the dummy master cylinder 14 applies a braking force, and the brake fluid drives the dual chamber master cylinder 12 through the third conduit 23, so that the first conduit 21 and the second conduit 22 output hydraulic pressure.

Optionally, fig. 4 is the utility model discloses a first self-checking operating condition's of electronic hydraulic brake system schematic diagram, as shown in fig. 4, connects second pressure sensor 25 on second pipeline 22, and the method of detecting the leakproofness of electronic hydraulic brake system includes:

controlling the driving mechanism 15 to start and controlling the first normally open valve 20 to be electrified;

the circuit tightness of the dual-chamber master cylinder 12 and the first normally open valve 20 is determined from the signal detected by the second pressure sensor 25.

Optionally, fig. 5 is a schematic diagram of a second self-checking operating state of the electronic hydraulic brake system of the present invention, as shown in fig. 5, a third liquid inlet pipe 29 is connected between the oil can 11 and the auxiliary master cylinder, and a second normally open valve 30 is connected to the third liquid inlet pipe 29; the method for detecting the tightness of the electronic hydraulic brake system further comprises the following steps:

controlling the driving mechanism 15 to start, controlling the first normally-open valve 20 to lose power and controlling the second normally-open valve 30 to be powered;

the circuit tightness of the dual-chamber master cylinder 12, the dummy master cylinder 14 and the second normally-open valve 30 is determined based on the signals acquired by the first pressure sensor 18 and the second pressure sensor 25.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the details of the above embodiments, and the technical concept of the present invention can be within the scope of the present invention, and can be modified to various simple variants, and these simple variants all belong to the protection scope of the present invention. The various features described in the foregoing detailed description may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations.

Claims

1. The utility model provides an electronic hydraulic braking system, its characterized in that includes oilcan, two-chamber master cylinder, simulation master cylinder, actuating mechanism, footboard simulator, first pressure sensor, stroke sensor, first normally open valve, first pipeline, second pipeline, third pipeline, fourth pipeline and the control unit, wherein:

the oil pot is respectively connected with the double-cavity main cylinder and the simulation main cylinder, the driving mechanism of the double-cavity main cylinder is connected with the double-cavity main cylinder, the pedal is connected with the simulation main cylinder, and the stroke sensor is used for detecting the moving stroke of the pedal;

the first pipeline and the second pipeline are connected with the dual-cavity master cylinder and are used for outputting hydraulic pressure;

one end of the third pipeline is connected with the second pipeline, the other end of the third pipeline is connected with the simulation master cylinder, and the first normally-open valve and the first pressure sensor are connected to the third pipeline;

the fourth pipeline is connected between the simulation master cylinder and the pedal simulator;

the control unit is electrically connected with the driving mechanism, the stroke sensor, the first pressure sensor and the first normally open valve respectively, and is used for controlling the driving mechanism to be started or closed and controlling the first normally open valve to be powered on or powered off.

2. The electro-hydraulic brake system of claim 1, further comprising a second pressure sensor connected to the second line and a position sensor for detecting a drive position of the drive mechanism, the second pressure sensor and the position sensor being electrically connected to the control unit.

3. The electro-hydraulic brake system as claimed in claim 2, further comprising a first fluid inlet pipe, a second fluid inlet pipe, a third fluid inlet pipe and a second normally open valve, wherein the first fluid inlet pipe and the second fluid inlet pipe are connected between the oil pot and the dual-chamber master cylinder, the third fluid inlet pipe is connected between the oil pot and the dummy master cylinder, the second normally open valve is connected to the third fluid inlet pipe, the second normally open valve is electrically connected to the control unit, and the control unit is configured to control the second normally open valve to be powered on or powered off.

4. The electro-hydraulic brake system of claim 3, further comprising a fifth line and a first check valve, wherein a liquid inlet end and a liquid outlet end of the fifth line are both connected to the third liquid inlet pipe, the first check valve is located between the liquid inlet end and the liquid outlet end of the fifth line, and the first check valve is connected to the fifth line.

5. The electro-hydraulic brake system of claim 3, wherein the control unit includes a self-test circuit that determines the leak-tightness of the system circuit based on the signals collected by the first and second pressure sensors.

6. The electro-hydraulic brake system of any one of claims 1 through 5, further comprising a damper connected to the fourth line.

7. The electro-hydraulic brake system as set forth in claim 6, further comprising a sixth line and a second check valve, wherein an inlet end and an outlet end of said sixth line are connected to said fourth line, said damper is located between said inlet end and said outlet end of said sixth line, and said second check valve is connected to said sixth line.

8. The electro-hydraulic brake system as claimed in any one of claims 1 to 5, further comprising a plurality of wheel cylinders or ABS/ESCs, and the fluid outlet ends of the first and second conduits are connected to the plurality of wheel cylinders or ABS/ESCs, respectively.

9. The electro-hydraulic brake system as defined in any one of claims 1 to 5, wherein the dual chamber master cylinder includes a first master cylinder, a first actuating shaft, and a first piston, a second piston, a first spring and a second spring installed in the first master cylinder, the first piston and the second piston being spaced apart from each other, the first spring being connected between an inner wall of the first master cylinder and the first piston, the second spring being connected between the first piston and the second piston, one end of the first actuating shaft being movably connected to the second piston, and the other end of the first actuating shaft passing through the first master cylinder and being connected to the actuating mechanism.