Decoupling type electronic braking system

Abstract

The invention discloses a decoupling type electronic braking system which comprises a pedal assembly module, a control module and an electronic braking module. The pedal assembly module sends a control signal to the pressure building module, pressure building, pressure maintaining and pressure reducing control is conducted on at least two wheels of an automobile through the pressure building module, and the wheels comprise two front wheels and two rear wheels; the backup module is used for monitoring a hydraulic pressure signal generated by the pressure building module in the control process, assisting hydraulic pressure control and carrying out backup pressure building on front wheels of the automobile; the brake system is designed and improved, the number of electromagnetic valves in the system is reduced, the cost is reduced, meanwhile, the redundant power-assisted brake capacity is achieved, wheel cylinder pressure adjustment can be achieved, and therefore redundant backup for the anti-lock function and the vehicle body stability control function is achieved.

Description

Technical Field

[0001] The invention relates to the field of automobile brake control, and in particular to a decoupled electronic brake system. Background Art

[0002] In traditional braking system solutions, the vacuum booster responsible for building pressure is used in conjunction with the ESC / ABS system responsible for regulating wheel-end pressure. However, with the continuous advancement of automotive technology, integrated braking systems have been invented to replace the performance and functions that can be achieved by the combination of vacuum boosters and ESC / ABS systems.

[0003] When the existing integrated brake system is in normal working mode, the master cylinder isolation valve and the active pressure building mechanism isolation valve will be powered on, decoupling the driver's operation on the brake pedal from the pressure building of the active pressure building mechanism. At the same time, the pedal feel simulator switch valve is powered on and opened, allowing the fluid flow generated by the driver's depressing the brake pedal to enter the pedal feel simulator, producing a pedal feel similar to that of a traditional vacuum booster vehicle. The vehicle's braking intention can be collected and calculated by the pedal displacement sensor, or it can be input through other vehicle modules such as ADAS (Advanced Driver Assistance System) to input the braking target to the integrated brake system for execution.

[0004] When the system fails and is in mechanical backup mode, the solenoid valve coil and the active pressure building mechanism do not work. When the driver steps on the brake pedal, the brake fluid generates braking pressure under the driver's human power and enters the wheel cylinders to generate braking force.

[0005] The integrated braking system has some shortcomings due to its highly integrated design: a large number of solenoid valves, high material costs, high process difficulty, and high manufacturing costs; it only has the braking capability of mechanical failure backup, and does not have the backup capability of the power-assist function. In the event of failure, it must rely on the driver's timely intervention, otherwise it may cause danger. It cannot adjust the wheel cylinder pressure in the backup mode, so it cannot back up the anti-lock braking function or the body stability control function. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a decoupled electronic brake system.

[0007] In order to achieve the above object, the present invention adopts the following technical solution: a decoupled electronic braking system, comprising:

[0008] Pedal assembly module;

[0009] The pedal assembly module sends a control signal to the pressure building module, and the pressure building module controls the pressure building, pressure maintaining and pressure reducing of at least two wheels of the vehicle.

[0010] The wheels include two front wheels and two rear wheels;

[0011] The backup module monitors the hydraulic pressure signal generated by the pressure building module during the control process, and assists in hydraulic pressure control and backup pressure building for the front wheels of the vehicle.

[0012] As a further description of the above technical solution: the pedal assembly module includes: a brake pedal, the brake pedal is connected to a pedal simulator via a first sensor, and the first sensor sends the collected displacement signal and pressure signal to the pressure building module.

[0013] As a further description of the above technical solution: the pressure building module includes: a liquid storage tank, the liquid storage tank is connected to an active pressure building mechanism, the active pressure building mechanism is connected to four boosting valves, the boosting valves are connected in series with the wheels, and the boosting valves are also connected in parallel with a one-way valve.

[0014] As a further description of the above technical solution: the liquid storage tank is also connected to four pressure reducing valves, and the pressure reducing valves are connected in parallel with the boosting valves.

[0015] As a further description of the above technical solution: the backup module is connected to the liquid storage tank, the backup module includes a second sensor, and the second sensor is connected to any one of the front wheels.

[0016] As a further description of the above technical solution: the backup module also includes an integrated valve, two of which are provided and are connected in series with the boost valve connected to the front wheel.

[0017] As a further description of the above technical solution: the liquid storage tank is connected to the suction valve, two suction valves are provided, the output end of the suction valve is connected to the plunger pump, and the plunger pump is connected to the backup pressure building motor.

[0018] As a further description of the above technical solution: when building pressure, the suction valve is powered on and opened, so that the brake fluid is transported from the fluid storage tank to the plunger pump, and the backup pressure building motor builds backup pressure for the two front wheels.

[0019] As a further description of the above technical solution: the pedal simulator includes one or more combinations of a hydraulic damper, a spring, a reed, and rubber.

[0020] As a further description of the above technical solution: the active pressure building mechanism includes a motor, the output end of the motor is connected to a transmission mechanism, and the transmission mechanism drives the plunger to reciprocate.

[0021] The above technical solution has the following advantages or beneficial effects:

[0022] 1. By improving the design of the braking system, the number of solenoid valves in the system is reduced, the cost is reduced, and at the same time, redundant power-assisted braking capabilities are provided, and wheel cylinder pressure regulation can be achieved, thereby achieving redundant backup for the anti-lock braking function and body stability control function.

[0023] 2. The pedal assembly module, pressure building module, and backup pressure building module can be installed, disassembled, and replaced independently. Compared with the integrated braking system, it is easier to maintain and optimizes the structural space by reducing the number of solenoid valves. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural diagram of the existing pressure building backup system;

[0025] Figure 2 This is a schematic diagram of the structure of the braking system proposed by the present invention.

[0026] Legend:

[0027] 1. Pedal assembly module; 2. Pressure building module; 3. Backup module; 4. Front wheel; 5. Rear wheel; 6. Pedal simulator; 7. First sensor; 8. Brake pedal; 9. Liquid storage tank; 10. Active pressure building mechanism; 11. Boost valve; 12. Pressure reducing valve; 13. Second sensor; 14. Suction valve; 15. Integrated valve; 16. Plunger pump; 17. Backup pressure building motor. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Reference Figure 2 An embodiment of the present invention provides: a decoupled electronic brake system, comprising: a pedal assembly module 1; the pedal assembly module 1 sends a control signal to a pressure building module 2, and the pressure building module 2 controls at least two wheels of a car to build pressure, maintain pressure, and reduce pressure, and the wheels include two front wheels 4 and two rear wheels 5; a backup module 3 monitors the hydraulic pressure signal generated by the pressure building module 2 during the control process, assists in hydraulic pressure control, and performs backup pressure building on the front wheels 4 of the car.

[0030] In this embodiment, the pedal assembly module 1 performs pedal braking simulation, and monitors the displacement and pressure of the brake pedal 8 during the braking process through the first sensor 7, and generates a corresponding control signal, which is sent to the pressure building module 2. The pressure building module 2 is used to respond to the braking requirements of the driver or modules such as ADAS, and to build pressure, maintain pressure, and reduce pressure for a single wheel or multiple wheels. The pressure building module 2 builds pressure, maintains pressure, and reduces pressure on the wheels of the vehicle, and the backup module 3 assists in hydraulic pressure control and backup pressure building for the front wheels 4. The hydraulic pressure of the two front wheels 4 can be adjusted individually, and it has the backup capabilities of braking assistance, anti-lock braking function, and body stability control function for the front wheels 4, and can perform braking control, anti-lock braking control, body stability control and other functions according to the needs of the driver or the needs from systems such as ADAS.

[0031] The pedal assembly module 1 includes: a brake pedal 8 , which is connected to a pedal simulator 6 via a first sensor 7 , and the first sensor 7 sends the collected displacement signal and pressure signal to the pressure building module 2 .

[0032] In this embodiment, the first sensor 7 is a pedal sensor (capable of monitoring pedal displacement and pressure), which is connected to the brake pedal 8 to collect the driver's braking intention, and collects the speed and force of the driver's stepping on the brake pedal through the displacement sensor and the pressure sensor to comprehensively judge the size and speed of the required braking. In order to achieve the ability to support redundant power-assisted braking, the displacement sensor and the pressure sensor use two independent power supply solutions to power the displacement sensor and the pressure sensor respectively, so as to ensure that the brake pedal 8 can still have the data monitoring function in the event of a power failure.

[0033] By improving the design of the braking system, the number of solenoid valves in the system is reduced, the cost is reduced, and at the same time, redundant power-assisted braking capabilities are provided, and wheel cylinder pressure regulation can be achieved, thereby achieving redundant backup for the anti-lock braking function and body stability control function.

[0034] The pedal assembly module 1 can be installed on the firewall of the whole vehicle. The strength requirement for the firewall is no different from that of traditional vehicles, and is lower than the strength requirement of the firewall of the existing integrated braking system. The pressure building module 2 and the backup pressure building module 3 are installed in places such as the front cabin or other locations of the whole vehicle. They can be flexibly installed and arranged in the front cabin or other areas of the whole vehicle, which is beneficial to the vehicle space design. At the same time, the pedal assembly module, the pressure building module, and the backup pressure building module can be independently installed, disassembled and replaced, which is easier to maintain than the integrated braking system, and the structural space can be optimized by reducing the number of solenoid valves.

[0035] The pedal simulator 6 includes one or more combinations of hydraulic dampers, springs, reeds, and rubbers, and transmits force to the driver's feet through the pedal. It can simulate the displacement and pressure generated by pressing down the actual brake pedal during braking.

[0036] The pressure building module 2 includes: a liquid storage tank 9, the liquid storage tank 9 is connected to an active pressure building mechanism 10, the active pressure building mechanism 10 is connected to four boosting valves 11, and the boosting valves 11 are connected in series with the wheels; the liquid storage tank 9 is also connected to four pressure reducing valves 12, the pressure reducing valves 12 are connected in parallel with the boosting valves 11, and the boosting valves 11 are also connected in parallel with a one-way valve.

[0037] In this embodiment, the fluid storage tank 9 is used to store brake fluid, provide the brake fluid required for braking and contain the brake fluid discharged when the wheel is depressurized through the pressure reducing valve 12; the active pressure building mechanism 10 includes a motor, a transmission mechanism, and a plunger, wherein the motor is a power source, the transmission mechanism converts the rotational motion of the motor into appropriate linear motion and pushes the plunger piston to build pressure, the transmission mechanism can be a crank rocker mechanism (not shown), and the plunger pressurizes the brake fluid and transmits it to each wheel to achieve braking.

[0038] By designing four boost valves 11 and four pressure reducing valves 12, the boost, pressure maintaining and pressure reducing actions of each wheel can be controlled independently, supporting the system to realize the anti-lock braking function and the vehicle body stability control function. A one-way valve is also arranged in parallel on the outside of the boost valve 11. When the pressure of the brake fluid delivered by the fluid storage tank 9 is relatively high, overflow can be carried out through the one-way valve to prevent the brake fluid from directly acting on the wheel for braking.

[0039] The backup module 3 is connected to the liquid storage tank 9 . The backup module 3 includes a second sensor 13 . The second sensor 13 is connected to any one of the front wheels 4 .

[0040] The inventor found in the research that the front wheels of the car play a dominant role in braking and stability control. Considering the cost and utility, this solution backs up the braking capacity of the front wheels. This module can realize backup power-assisted braking and wheel cylinder pressure regulation, thereby realizing redundant backup of anti-lock braking function and body stability control function. The second sensor 13 is a pressure sensor, which is used to collect the hydraulic pressure generated by the pressure building module 2, and assist in pressure control and hydraulic leakage and other system diagnosis functions.

[0041] The backup module 3 also includes an integrated valve 15, two of which are connected in series to the boost valve 11 connected to the front wheel 4; the liquid storage tank 9 is connected to the suction valve 14, two of which are provided, and the output end of the suction valve 14 is connected to the plunger pump 16, which is connected to the backup pressure building motor 17.

[0042] When pressure is being built up, the suction valve 14 is powered on and opened, so that the brake fluid is delivered from the fluid reservoir 9 to the plunger pump 16 , and the backup pressure-building motor 17 builds up backup pressure for the two front wheels 4 .

[0043] In this embodiment, when pressure buildup is required, the suction valve 14 is powered on and opened, so that the brake fluid can be transferred from the fluid storage tank 9 to the plunger pump 16, and the backup pressure buildup motor 17 starts working, driving the plunger pump 16 to build up the fluid pressure, and at the same time, the integrated valve 15 is powered on and controlled according to the required brake pressure and change trend. When pressure reduction is required, the integrated valve 15 can be made to reduce the current to achieve opening control or fully open the valve core to reduce pressure; when pressure maintenance is required, the actions of the integrated valve 15 and the backup pressure buildup motor 17 can be coordinated and controlled to achieve constant pressure control for a single wheel.

[0044] Since each front wheel 4 is connected to a set of suction valves 14 and integrated valves 15, the hydraulic pressure of the two front wheels 4 can be adjusted individually, including pressure increase, pressure reduction, and pressure maintenance, and it has the backup capabilities of brake assist, anti-lock braking function and body stability control function for the front wheels 4.

[0045] It should be noted that, because a backup pressure-building motor 17 drives two plunger pumps 16, but not every wheel has the need to build pressure under various working conditions, a separate design of the suction valve 14 can ensure that the control of the wheels that do not require pressure building is not affected. By designing the suction valve 14, it is also possible to prevent pressure fluctuations in the liquid storage tank 9 from affecting the plunger pump 16.

[0046] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A decoupled electronic braking system, characterized in that: include: Pedal assembly module (1); The pedal assembly module (1) sends a control signal to the pressure building module (2), and the pressure building module (2) controls the pressure building, pressure maintenance and pressure reduction of at least two wheels of the vehicle. The wheels include two front wheels (4) and two rear wheels (5); The backup module (3) monitors the hydraulic pressure signal generated by the pressure building module (2) during the control process, assists in hydraulic pressure control and performs backup pressure building on the front wheels (4) of the vehicle.

2. A decoupled electronic brake system according to claim 1, characterized in that: The pedal assembly module (1) comprises: a brake pedal (8), wherein the brake pedal (8) is connected to a pedal simulator (6) via a first sensor (7), and the first sensor (7) sends a collected displacement signal and pressure signal to the pressure building module (2).

3. A decoupled electronic brake system according to claim 1, characterized in that: The pressure building module (2) comprises: a liquid storage tank (9), the liquid storage tank (9) is connected to an active pressure building mechanism (10), the active pressure building mechanism (10) is connected to four boosting valves (11), the boosting valves (11) are connected in series with the wheels, and the boosting valves (11) are also connected in parallel with a one-way valve.

4. A decoupled electronic brake system according to claim 3, characterized in that: The liquid storage tank (9) is also connected to four pressure reducing valves (12), and the pressure reducing valves (12) are connected in parallel with the pressure increasing valves (11).

5. A decoupled electronic brake system according to claim 3, characterized in that: The backup module (3) is connected to the liquid storage tank (9), and the backup module (3) comprises a second sensor (13), and the second sensor (13) is connected to any one of the front wheels (4).

6. A decoupled electronic brake system according to claim 4, characterized in that: The backup module (3) further comprises an integrated valve (15), wherein two integrated valves (15) are provided and are connected in series with the boost valve (11) connected to the front wheel (4).

7. A decoupled electronic brake system according to claim 3, characterized in that: The liquid storage tank (9) is connected to a suction valve (14), two suction valves (14) are provided, the output end of the suction valve (14) is connected to a plunger pump (16), and the plunger pump (16) is connected to a backup pressure-building motor (17).

8. A decoupled electronic brake system according to claim 7, characterized in that: When pressure is being built up, the suction valve (14) is powered on and opened, so that brake fluid is transported from the fluid storage tank (9) to the plunger pump (16), and the backup pressure building motor (17) builds up backup pressure for the two front wheels (4).

9. The decoupled electronic brake system according to claim 2, characterized in that: The pedal simulator (6) comprises one or more combinations of a hydraulic damper, a spring, a reed, and rubber.

10. The decoupled electronic brake system according to claim 3, characterized in that: The active pressure building mechanism (10) comprises a motor, the output end of which is connected to a transmission mechanism, and the transmission mechanism drives the plunger to perform reciprocating motion.

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