Two-box dual-redundancy brake-by-wire system

Abstract

The utility model relates to vehicle line control brake technical field discloses a kind of Two-box double-redundancy line control brake systems, including DEB module and ESC module, ESC module directly from whole car oil can suction oil, and the oil port of whole car oil can is connected with first plunger pump oil inlet, second plunger pump oil inlet by oil passage respectively;The oil port of whole car oil can is connected with first pressure-reducing valve, second pressure-reducing valve, third pressure-reducing valve, fourth pressure-reducing valve by oil passage respectively, and ESC module directly oil to whole car oil can is discharged.DEB module not only provides the high-pressure oil of running brake, but also provides the power source when ABS, ESC, TCS of ESC module triggers, reduces product noise, improves the top foot problem when ABS function, effectively improves the reliability of product.

Description

Technical Field

[0001] This utility model relates to the field of vehicle brake-by-wire technology, and in particular to a Two-box dual-redundant brake-by-wire system. Background Technology

[0002] In the current field of vehicle brake-by-wire systems, there are brake-by-wire systems for passenger cars and commercial vehicles, mainly based on One-box (integrating multiple functions into one module) and Two-box (two independent modules) braking system solutions. Existing Two-box braking systems basically consist of two main modules: one is an independent brake booster DEB (or DPB, Digital Electro-Hydraulic Brake) module, whose main function is to handle the high-pressure hydraulic oil required for service braking and to decouple the mechanical master cylinder and the electric plunger cylinder, essentially acting as a braking power module; the other is an ESC (Electronic Stability Control) module. The ESC module implements functions such as ABS (Anti-lock Braking System), ESC, TCS (Traction Control System), and electric redundant braking backup. In implementing these functions, the high-pressure hydraulic oil is supplied by a plunger pump driven by the ESC assembly's motor. Considering cost, the ESC assembly's motor typically uses a brushed motor, which is prone to wear and failure, resulting in insufficient reliability, limited lifespan, and high operating noise. In addition, existing designs often suffer from poor pedal feel when the ABS is working, such as a heavy pedal feel or pedal resistance. Summary of the Invention

[0003] To overcome the shortcomings of the existing technology, this utility model provides a Two-box dual-redundant brake-by-wire system. It eliminates the intake valve and accumulator of the existing ESC module, redesigns the oil pipeline, and supplies the required high-pressure oil to the plunger driven by the brushless motor of the DEB module. When the DEB module fails, the ESC module's motor drives the plunger pump to directly draw oil from the reservoir, achieving electric redundant braking backup and functions such as ABS, ESC, and TCS. When both the DEB and ESC modules fail, when the vehicle brakes, the manual pedal movement drives the mechanical master cylinder piston forward to supply high-pressure oil, achieving mechanical redundant braking. The technical solution adopted in this utility model is: a Two-box dual-redundant brake-by-wire system, including a DEB module and an ESC module. The DEB module includes a vehicle oil reservoir, and the ESC module includes a first plunger pump, a second plunger pump, a first pressure reducing valve, a second pressure reducing valve, a third pressure reducing valve, and a fourth pressure reducing valve. The oil port of the vehicle oil reservoir is connected to the oil inlet of the first plunger pump and the oil inlet of the second plunger pump through oil passages, and the ESC module directly draws oil from the vehicle oil reservoir. The oil port of the vehicle oil reservoir is connected to the first pressure reducing valve, the second pressure reducing valve, the third pressure reducing valve, and the fourth pressure reducing valve through oil passages, and the ESC module directly discharges oil to the vehicle oil reservoir.

[0004] Furthermore, the DEB module also includes a first-loop isolation valve, a second-loop isolation valve, a first-plunger isolation valve, and a second-plunger isolation valve; the ESC module also includes a first-pressure relief valve, a second-pressure relief valve, a first-pressure booster valve, a second-pressure booster valve, a third-pressure booster valve, and a fourth-pressure booster valve; the oil outlets of the first-loop isolation valve and the first-plunger isolation valve are connected to the oil inlet of the first-pressure relief valve; the oil outlets of the second-loop isolation valve and the second-plunger isolation valve are connected to the oil inlet of the second-pressure relief valve; the oil outlet of the first-pressure relief valve is connected to the first-pressure booster valve and the second-pressure booster valve respectively, and the oil outlet of the second-pressure relief valve is connected to the third-pressure booster valve and the fourth-pressure booster valve respectively.

[0005] Furthermore, the DEB module also includes a plunger motor, which is a brushless motor. When both the DEB module and the ESC module are functioning normally, the high-pressure oil required to realize the function of the ESC module is provided by the plunger motor of the DEB module. The high-pressure oil flows through the first plunger isolation valve and the second plunger isolation valve, then through the first pressure limiting valve and the second pressure limiting valve, and then splits into four paths through the first pressure boosting valve, the second pressure boosting valve, the third pressure boosting valve, and the fourth pressure boosting valve to reach the wheel end.

[0006] Compared with the prior art, the beneficial effects of this utility model are: Reduce product costs: Eliminating the intake valve and accumulator of the existing ESC module can reduce material and manufacturing costs by at least 15%, which can greatly enhance the product's market competitiveness; Improve product reliability: The innovative design of the Two-box structure allows the high-pressure oil required when triggering functions such as ABS and ESC under normal conditions to be provided by the plunger driven by the brushless motor of the DEB module. Compared with the existing technology that uses the ESC brushed motor to drive the plunger pump, the reliability of the product is greatly improved. Optimizing product performance: Since the ABS, ESC, TCS and other functions provided by this utility model are implemented by DEB, the motor and plunger pump on the original ESC can be turned off, which can effectively reduce noise. The solution provided by this utility model also effectively solves the problem of poor master cylinder pedal feel when ABS is working, which directly and effectively improves the driver's experience and highlights the product advantages. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the Two-box dual-redundant linear control braking system provided by this utility model; Among them: 1-Vehicle oil reservoir, 2-Test isolation valve, 3-Master cylinder, 4-Simulator isolation valve, 5-Pedal simulator, 6-Plunger motor, 7-Plunger, 81-First circuit isolation valve, 82-Second circuit isolation valve, 91-First plunger isolation valve, 92-Second plunger isolation valve, 101-First pressure limiting valve, 102-Second pressure limiting valve, 11-Plunger pump motor, 121-First plunger pump, 122-Second plunger pump, 131-First booster valve, 132-Second booster valve, 133-Third booster valve, 134-Fourth booster valve, 141-First pressure reducing valve, 142-Second pressure reducing valve, 143-Third pressure reducing valve, 144-Fourth pressure reducing valve. Detailed Implementation

[0008] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0009] Compared to existing two-box brake-by-wire systems, the design provided by this invention first eliminates the intake valve and accumulator in existing ESC modules. In the embodiments provided by this invention, the ESC module may also include an ESC oil reservoir, and the DEB module may include a DEB oil reservoir. The plunger pump of the ESC module directly draws oil from the vehicle oil reservoir / ESC oil reservoir / DEB oil reservoir, and the pressure relief valve of the ESC module directly discharges oil into the reservoir. Furthermore, the design provided by this invention creatively alters the working principles of the DEB and ESC modules under normal conditions. The DEB module is not only responsible for providing the high-pressure oil required for service braking and decoupling the mechanical master cylinder and electric plunger cylinder, but also for providing the high-pressure oil required for the ESC module to trigger its function.

[0010] like Figure 1 As shown, a Two-box dual-redundant brake-by-wire system includes a DEB module and an ESC module. The DEB module includes a vehicle oil reservoir 1, a test isolation valve 2, a master cylinder 3, a simulator isolation valve 4, a pedal simulator 5, a plunger 7, a plunger motor 6, a first circuit isolation valve 81, a second circuit isolation valve 82, a first plunger isolation valve 91, and a second plunger isolation valve 92. The ESC module includes a first pressure relief valve 101, a second pressure relief valve 102, a plunger pump motor 11, a first plunger pump 121, a second plunger pump 122, a first booster valve 131, a second booster valve 132, a third booster valve 133, a fourth booster valve 134, a first pressure relief valve 141, a second pressure relief valve 142, a third pressure relief valve 143, and a fourth pressure relief valve 144. The oil inlet of the vehicle oil reservoir 1 is connected to the oil inlet of the first plunger pump and the oil inlet of the second plunger pump through oil passages; the oil inlet of the vehicle oil reservoir 1 is connected to the first pressure reducing valve 141, the second pressure reducing valve 142, the third pressure reducing valve 143, and the fourth pressure reducing valve 144 through oil passages; the oil outlets of the first circuit isolation valve 81 and the first plunger isolation valve 91 are connected to the oil inlet of the first pressure limiting valve 101; the oil outlets of the second circuit isolation valve 82 and the second plunger isolation valve 92 are connected to the oil inlet of the second pressure limiting valve 102; the oil outlet of the first pressure limiting valve 101 is connected to the first pressure boosting valve 131 and the second pressure boosting valve 132, respectively, and the oil outlet of the second pressure limiting valve 102 is connected to the third pressure boosting valve 133 and the fourth pressure boosting valve 134, respectively.

[0011] The implementation process of the two-box dual-redundant linear braking system under different operating conditions is as follows: (1) Service braking conditions When the vehicle is in motion, the driver presses the brake pedal. The travel sensor sends the master cylinder displacement signal to the brake-by-wire system controller (ECU). The ECU then issues a command to close the first / second circuit isolation valve and open the simulator isolation valve and the first / second plunger isolation valve. Simultaneously, the plunger motor of the DEB module begins to operate. Because the first / second circuit isolation valve is closed and the simulator isolation valve is open, pressurized oil from the front chamber of the master cylinder enters the pedal simulator. At this time, the plunger motor of the DEB module drives the plungers to rapidly build up pressure. The high-pressure oil passes through the first / second plunger isolation valve, the first / second pressure relief valve, and the first / second / third / fourth pressure boosting valve to reach the wheel ends, braking the wheels.

[0012] (2) Triggering ABS function condition When the service brakes trigger the ABS, the first / second / third / fourth pressurization valves close, and the first / second / third / fourth depressurization valves open. High-pressure oil flows directly into the reservoir through the pipeline. Then, the plunger motor of the DEB module drives the plunger to continue pushing forward and increasing pressure. When the pressure reaches the lock-up point, the first / second / third / fourth pressurization valves close, and the first / second / third / fourth depressurization valves open, allowing high-pressure oil to flow directly into the reservoir through the pipeline. This cycle repeats until the vehicle comes to a stop.

[0013] (3) Redundant braking condition When the DEB module fails and the vehicle brakes, the first / second pressure relief valve closes, the ESC module's plunger pump motor runs, driving the plunger pump to draw oil directly from the reservoir, and then the first / second plunger pump pressurizes it, generating high-pressure oil that reaches the wheel end through the first / second / third / fourth pressure boosting valves to perform braking.

[0014] (4) Mechanical backup operating condition When both the DEB and ESC modules fail, the vehicle brakes by manually pressing the brake pedal, which drives the master cylinder piston forward to generate high-pressure oil. This oil then passes through the first / second circuit isolation valve, the first / second pressure relief valve, and the first / second / third / fourth pressure boosting valve to reach the wheel end and apply the brakes.

Claims

1. A two-box dual-redundant brake-by-wire system, comprising a DEB module and an ESC module, characterized in that: The DEB module includes a vehicle oil reservoir, and the ESC module includes a first plunger pump, a second plunger pump, a first pressure reducing valve, a second pressure reducing valve, a third pressure reducing valve, and a fourth pressure reducing valve. The oil inlet of the vehicle oil reservoir is connected to the oil inlet of the first plunger pump and the oil inlet of the second plunger pump through oil passages, and the ESC module directly draws oil from the vehicle oil reservoir. The oil inlet of the vehicle oil reservoir is connected to the first pressure reducing valve, the second pressure reducing valve, the third pressure reducing valve, and the fourth pressure reducing valve through oil passages, and the ESC module directly discharges oil to the vehicle oil reservoir.

2. The Two-box dual-redundant brake-by-wire system according to claim 1, characterized in that: The DEB module further includes a first loop isolation valve, a second loop isolation valve, a first plunger isolation valve, and a second plunger isolation valve; the ESC module further includes a first pressure limiting valve, a second pressure limiting valve, a first booster valve, a second booster valve, a third booster valve, and a fourth booster valve; the oil outlets of the first loop isolation valve and the first plunger isolation valve are connected to the oil inlet of the first pressure limiting valve; the oil outlets of the second loop isolation valve and the second plunger isolation valve are connected to the oil inlet of the second pressure limiting valve; the oil outlet of the first pressure limiting valve is connected to the first booster valve and the second booster valve respectively, and the oil outlet of the second pressure limiting valve is connected to the third booster valve and the fourth booster valve respectively.

3. The Two-box dual-redundant brake-by-wire system according to claim 2, characterized in that: The DEB module also includes a plunger motor, which is a brushless motor. When both the DEB module and the ESC module are functioning normally, the high-pressure oil required to realize the function of the ESC module is provided by the plunger motor of the DEB module. The high-pressure oil flows through the first plunger isolation valve and the second plunger isolation valve, then through the first pressure limiting valve and the second pressure limiting valve, and then through four paths through the first pressure boosting valve, the second pressure boosting valve, the third pressure boosting valve and the fourth pressure boosting valve to reach the wheel end.

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