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CN-122009126-A - Redundant braking system backup method and control system

CN122009126ACN 122009126 ACN122009126 ACN 122009126ACN-122009126-A

Abstract

The invention discloses a redundancy braking system backup method and a redundancy braking system backup control system, which comprise the steps that a hydraulic braking power-assisting module receives a braking signal sent by an electronic hydraulic braking system and calculates target hydraulic pressure, the braking hydraulic pressure of the braking module is monitored according to the target hydraulic pressure, whether the braking module acts or not is judged, if not, braking is not carried out, pressurization is carried out, the braking signal is sent to an ESC judging module, the electronic hydraulic braking system sends a pressurization request command to the ESC judging module through the hydraulic braking power-assisting module, and the ESC judging module controls a pressure building module to calculate the pressure building hydraulic pressure. By the designed backup method of the braking system, the braking module is judged to act or not when hydraulic braking is carried out, the built-up hydraulic pressure is compensated, enough hydraulic pressure can be provided for braking when emergency braking is needed, the risk of failure caused by electronic hydraulic braking can be reduced, and the safety in the driving and driving processes is improved.

Inventors

  • XU SONGYUN
  • SHI DEYU
  • HUANG PINGYU

Assignees

  • 千顾汽车科技(江苏)有限公司

Dates

Publication Date
20260512
Application Date
20231221

Claims (10)

  1. 1. A redundant braking system backup method, comprising: S1, a hydraulic brake booster module (1) receives a brake signal sent by an electronic hydraulic brake system (2) and calculates target hydraulic pressure; S2, the ESC judging module (3) monitors the brake hydraulic pressure of the brake module (4) according to the calculated target hydraulic pressure, judges whether the brake module (4) acts, if so, judges to start braking, continuously detects a braking signal, and if not, does not brake, and opens a suction valve of the electronic vehicle body stability control system to boost pressure; And S3, sending the braking signal to the ESC judging module (3), and if the braking module (4) is not triggered, sending a pressurizing request command to the ESC judging module (3) by the electronic hydraulic braking system (2) through the hydraulic braking assistance module (1), wherein the ESC judging module (3) controls the pressure building module (5) to calculate the pressure building hydraulic pressure.
  2. 2. A redundant brake system backup method according to claim 1 wherein said brake signal is transmitted upon failure of an electro-hydraulic brake system (2), said brake signal comprising a pedal displacement signal, a brake light switch signal and a master cylinder hydraulic pressure signal.
  3. 3. A redundant brake system backup method according to claim 1 wherein said hydraulic brake booster module (1) recognizes a brake light switch signal action, triggers a brake light switch signal available flag bit, and receives a fail flag bit of an electro-hydraulic brake system (2).
  4. 4. The method for backing up a redundant brake system according to claim 1, wherein when a brake lamp switch signal is activated and an electro-hydraulic brake system (2) fails, a brake module (4) does not trigger ABS operation, and a suction valve is opened to perform pressurization and liquid storage.
  5. 5. A redundant brake system backup method according to claim 1 wherein an electro-hydraulic brake system (2) monitors a brake fluid pressure coefficient required at a vehicle braking deceleration and the minimum brake fluid pressure required when the electro-hydraulic brake system (2) fails is derived from the brake deceleration multiplied by the brake fluid pressure coefficient.
  6. 6. A redundant brake system backup method according to claim 5 wherein said minimum brake fluid pressure minus a pedal fluid pressure results in a compensating fluid pressure.
  7. 7. A redundant brake system backup method according to claim 6 wherein said electro-hydraulic brake system (2) collects master cylinder hydraulic pressure at failure, said master cylinder hydraulic pressure and said pedal hydraulic pressure being amplified according to a coefficient-pressure curve.
  8. 8. A redundant brake system backup method according to claim 7 wherein said amplification factor is multiplied by said compensating hydraulic pressure to provide a hydraulic pressure build-up.
  9. 9. A redundant brake system backup method according to claim 1 wherein said electro-hydraulic brake system (2) captures pedal displacement upon failure and derives target hydraulic pressure from a displacement-hydraulic pressure profile.
  10. 10. A redundant brake system backup control system, wherein said control system is adapted for use in a method as claimed in any one of claims 1-9, comprising: the hydraulic brake booster module (1) is used for receiving brake signals detected and collected in the braking process of the electronic hydraulic brake system (2) and calculating target hydraulic pressure; an electro-hydraulic brake system (2) for transmitting a brake signal to the hydraulic brake booster module (1) when braking is performed or when braking fails; the ESC judging module (3) is used for comparing the hydraulic pressure of the electronic hydraulic braking system (2) with the hydraulic pressure of the braking module (4) and judging whether the braking module (4) is triggered or not; a brake module (4) that calculates a brake fluid pressure other than the hydraulic brake assist module (1); and the pressure building module (5) is used for calculating the brake fluid pressure.

Description

Redundant braking system backup method and control system Technical Field The invention relates to the technical field of automobile brake control, in particular to a redundant brake system backup method and a control system. Background With the continuous development of the trend of electric and intelligent automobiles, more and more automobile types are provided with electronic hydraulic braking systems. And an electronic hydraulic brake system (EHB) for detecting the brake pedal displacement signal and transmitting the brake pedal displacement signal to an Electronic Control Unit (ECU), wherein the electronic control unit controls the motor to drive the hydraulic actuating mechanism to generate brake fluid pressure. The existing hydraulic pressure is mainly used for estimating the hydraulic pressure required by the automobile in the braking process according to the displacement signal of the pedal, and if an electronic control unit or a motor fails or the function is degraded in the braking process, the braking system cannot build pressure or the pressure building capacity is reduced, and the hydraulic pressure is insufficient in the hydraulic braking process, so that the requirement of the brake pressure under the condition of emergency braking of the automobile cannot be met. Disclosure of Invention The invention aims to solve the defects in the prior art and provides a redundant braking system backup method and a control system. In order to achieve the above purpose, the invention adopts the following technical scheme that the redundant braking system backup method comprises the following steps: s1, a hydraulic brake booster module receives a brake signal sent by an electronic hydraulic brake system and calculates target hydraulic pressure; S2, the ESC judging module monitors the brake fluid pressure of the brake module according to the calculated target fluid pressure, judges whether the brake module acts, if so, judges to start braking, continues to detect a braking signal, if not, does not brake, and opens a suction valve of the electronic vehicle body stability control system to boost pressure; And S3, sending the braking signal to the ESC judging module, and if the braking module is not triggered, sending a pressurizing request command to the ESC judging module by the electronic hydraulic braking system through the hydraulic braking assistance module, wherein the ESC judging module controls the pressure building module to calculate the pressure building hydraulic pressure. As a further description of the above aspects, the electro-hydraulic brake system is configured to send the brake signal when it fails, the brake signal including a pedal displacement signal, a brake light switch signal, and a master cylinder hydraulic pressure signal. As further description of the technical scheme, the hydraulic brake booster module recognizes the action of the brake lamp switch signal, triggers the available zone bit of the brake lamp switch signal and receives the failure zone bit of the electronic hydraulic brake system. As a further description of the technical scheme, when the brake lamp switch signal acts, the electronic hydraulic brake system fails, the brake module does not trigger the ABS to work, and the suction valve is opened to boost and store liquid. As a further description of the above solution, the electro-hydraulic brake system monitors a brake fluid pressure coefficient required at a vehicle braking deceleration and derives a minimum brake fluid pressure required when the electro-hydraulic brake system fails from the brake deceleration multiplied by the brake fluid pressure coefficient. As a further description of the above technical solution, the minimum brake fluid pressure minus the pedal fluid pressure obtains the compensating fluid pressure. As a further description of the above solution, the electro-hydraulic brake system collects a master cylinder hydraulic pressure at the time of failure, and the master cylinder hydraulic pressure and the pedal hydraulic pressure obtain an amplification factor according to a coefficient-pressure curve. As a further description of the above technical solution, the amplification factor is multiplied by the compensating hydraulic pressure to obtain the build-up hydraulic pressure. As a further description of the technical scheme, the electronic hydraulic brake system acquires pedal displacement when the electronic hydraulic brake system fails, and obtains target hydraulic pressure according to a displacement-hydraulic pressure curve graph. Also included is a redundant brake system backup control system adapted for use in a method according to any one of the above-described aspects, comprising: The hydraulic brake boosting module is used for receiving brake signals detected and collected in the braking process of the electronic hydraulic brake system and calculating target hydraulic pressure; the electronic hydraulic brake system is used for transmitting