CN-121989884-A - Rigidity correction method of hydraulic braking system, control system and electronic equipment

CN121989884ACN 121989884 ACN121989884 ACN 121989884ACN-121989884-A

Abstract

The invention discloses a rigidity correction method, a control system and electronic equipment of a hydraulic braking system, which comprise the steps that the control system judges the state of a vehicle through a sensor, if the state is a braking state, sensor signal updating is carried out, a rigidity correction factor is calculated, a correction factor coefficient is obtained by comparing the relation between the braking deceleration and the pressure value of a brake master cylinder with a reference value, the control system adjusts the correction factor coefficient according to a brake disc temperature model and a rigidity change gradient and temporarily stores the correction factor coefficient, the control system reads the temporarily stored correction factor coefficient to calculate the braking force, the rigidity correction factor is introduced to compensate the rigidity change, when the steady-state operation of the vehicle is met, the relation between the braking deceleration of the vehicle and the pressure value of the brake master cylinder pressure sensor in an ESC is obtained, the correction factor coefficient is obtained by comparing the obtained with the reference value provided by the vehicle design, the rigidity of the hydraulic system is calculated, and then the required braking force can be accurately obtained.

Inventors

TIAN FENG
ZHENG PENG
LI YUNSHENG

Assignees

千顾汽车科技(江苏)有限公司

Dates

Publication Date: 20260508
Application Date: 20231226

Claims (10)

1. A method of modifying the stiffness of a hydraulic brake system, comprising: s1, the control system judges the state of the vehicle through a sensor, if the vehicle is in a non-braking state, the original state is maintained, if the vehicle is in a braking state, sensor signal updating is carried out, a rigidity correction factor is calculated, and the step S2 is carried out; s2, the rigidity correction factor is compared with a reference value according to the pressure value relation between the braking deceleration and the brake master cylinder pressure to obtain a correction factor coefficient; S3, the control system adjusts the variation range of the correction factor coefficient according to the temperature model of the brake disc and the rigidity variation gradient, and temporarily stores the obtained correction factor coefficient; and S4, the control system reads the temporarily stored correction factor coefficient, calculates the braking force, judges the state of the vehicle and returns to the step S1.
2. The method for correcting the rigidity of a hydraulic brake system according to claim 1, wherein the sensor comprises a steering wheel angle sensor, a longitudinal acceleration sensor, a wheel speed sensor and a brake master cylinder pressure sensor, the control system is used for controlling and monitoring, sensor signals are collected, whether a vehicle is in a stable braking state or not is judged through the sensor signals, if not, signal collection is continued, and if so, the obtained sensor signals are processed.
3. The method for correcting the rigidity of a hydraulic brake system according to claim 2, wherein said control system monitors a steering wheel angle from said steering wheel angle sensor, monitors a master cylinder pressure signal from said master cylinder pressure sensor, determines whether the steering wheel angle and the master cylinder pressure signal are within a set threshold range, if so, confirms that the vehicle is decelerating uniformly, calculates a vehicle braking force, and if not, continues to monitor.
4. A hydraulic brake system stiffness correction method as set forth in claim 3 wherein a ratio of the vehicle braking force to the master cylinder pressure is a braking stiffness, and dividing the braking stiffness by the reference value yields the correction factor coefficient.
5. A method of modifying the stiffness of a hydraulic brake system as set forth in claim 1 wherein the vehicle braking force is the difference between the resultant longitudinal vehicle force and the rolling resistance, wind resistance, and powertrain drag force calculated from the braking deceleration.
6. A method of modifying the stiffness of a hydraulic brake system as set forth in claim 1 wherein said control system monitors brake disc temperature via a sensor to generate said brake disc temperature model and adjusts said correction factor based on changes in said brake stiffness.
7. The method for correcting the rigidity of a hydraulic brake system according to claim 1, wherein said control system temporarily stores said correction factor coefficient in a memory, and said control system reads said temporarily stored correction factor coefficient to calculate a braking force after the control system is powered on.
8. A hydraulic brake system stiffness correction control system, characterized in that the control system is adapted for use in a method according to any of the preceding claims 1-7, comprising: the acquisition module (1) is used for controlling the sensor to receive signals and transmitting and controlling the received sensor signals; The processing module (2) is used for receiving the sensor signals sent by the acquisition module, filtering and amplifying the sensor signals and then sending the sensor signals to the vehicle steady state judgment module; the vehicle steady state judging module (3) is used for receiving the sensor signal sent by the processing module and judging whether the vehicle is in uniform deceleration or not; And the calculation module (4) calculates and obtains a correction factor coefficient according to the collected vehicle braking deceleration and the brake master cylinder pressure.
9. A hydraulic brake system stiffness correction control system as set forth in claim 8 wherein the control system processes the correction factor coefficients based on a brake disc temperature model and a stiffness variation gradient.
10. An electronic device adapted for use in the method of any one of claims 1-7 and the control system of any one of claims 8-9, comprising: A processor; a memory for storing the processor-executable instructions; The processor is configured to execute the instructions and send the control instructions to the control system for computational processing.

Description

Rigidity correction method of hydraulic braking system, control system and electronic equipment Technical Field The invention relates to the field of vehicle chassis control signal processing, in particular to a hydraulic braking system rigidity correction method, a control system and electronic equipment. Background In existing hydraulic vehicle Brake systems, particularly automatic park (AVH Auto Vehicle Hold) or Brake-by-Wire (Brake by Wire) applications, a desired vehicle acceleration of the gradient-combined Brake-by-Wire system is estimated from a longitudinal acceleration signal of an inertial sensor, a required braking force is calculated, and a final treatment to a braking pressure is performed by the hydraulic system. In the step of calculating the braking pressure by the required braking force in the above mode, if the rigidity of the hydraulic braking system (the corresponding relation between the pressure of the hydraulic braking system and the braking force) is changed due to heat fading of the braking system, abrasion of a braking plate or non-running-in of the brake, excessive or insufficient braking force may occur, and the problem of mismatching between the braking force and the braking requirement is caused. Previous solutions have been to design closed loop control systems to correct for the bias, but have resulted in response delays or reduced brake life. Disclosure of Invention The invention aims to solve the defects in the prior art, and provides a hydraulic braking system rigidity correction method, a control system and electronic equipment. In order to achieve the purpose, the invention adopts the following technical scheme that the method for correcting the rigidity of the hydraulic braking system comprises the following steps: s1, the control system judges the state of the vehicle through a sensor, if the vehicle is in a non-braking state, the original state is maintained, if the vehicle is in a braking state, sensor signal updating is carried out, a rigidity correction factor is calculated, and the step S2 is carried out; s2, the rigidity correction factor is compared with a reference value according to the pressure value relation between the braking deceleration and the brake master cylinder pressure to obtain a correction factor coefficient; S3, the control system adjusts the variation range of the correction factor coefficient according to the temperature model of the brake disc and the rigidity variation gradient, and temporarily stores the obtained correction factor coefficient; and S4, the control system reads the temporarily stored correction factor coefficient, calculates the braking force, judges the state of the vehicle and returns to the step S1. The technical scheme is further described that the sensor comprises a steering wheel angle sensor, a longitudinal acceleration sensor, a wheel speed sensor and a brake master cylinder pressure sensor, the sensor is controlled by the control system to monitor, sensor signals are collected, whether the vehicle is in a stable braking state or not is judged through the sensor signals, if not, signal collection is continued, and if yes, the obtained sensor signals are processed. As a further description of the technical scheme, the control system monitors the steering wheel angle according to the steering wheel angle sensor, monitors the brake master cylinder pressure signal according to the brake master cylinder pressure sensor, judges whether the steering wheel angle and the brake master cylinder pressure signal are in a set threshold range, confirms that the vehicle is uniformly decelerated if the steering wheel angle and the brake master cylinder pressure signal are in the set threshold range, calculates the braking force of the vehicle, and continuously maintains monitoring if the steering wheel angle and the brake master cylinder pressure signal are not in the set threshold range. As a further description of the above technical solution, the ratio of the vehicle braking force to the brake master cylinder pressure is a braking stiffness, and the correction factor coefficient is obtained by dividing the braking stiffness by the reference value. As a further description of the technical scheme, the vehicle braking force is the difference between the longitudinal resultant force of the vehicle and the rolling resistance, the wind resistance and the power assembly dragging force, and the power assembly dragging force is calculated through the braking deceleration. As a further description of the above technical solution, the control system monitors the brake disc temperature through a sensor, generates the brake disc temperature model, and adjusts the correction factor coefficient according to the change of the brake stiffness. As a further description of the technical scheme, the control system temporarily stores the correction factor coefficient in a storage, and after the control system is powered on and operates, the control s