Active brake wheel cylinder pressure control based on integrated electro-hydraulic brake system
2022-01-0342
03/29/2022
- Event
- Content
- With the development of automobile industry, the requirements of quick response, high performance are put forward for the braking system. Since the traditional braking system cannot achieve these, the international brake parts manufacturers put forward an integrated electronic braking system -the 1-Box. It can realize active braking through the servo motor. In addition, by controlling the pressure of servo cylinder and working with solenoid valves, the wheel cylinder pressure can be controlled. However, it has some problems, such as hydraulic hysteresis disturbance and complex friction obstruction, which cause obstacles to the accurate control of wheel cylinder pressure. In this paper, the active brake pressure control strategy of wheel cylinders is designed based on 1-Box. First, introduce the configuration and the working principle of wheel cylinder pressure control; Next, design the servo cylinder active brake pressure control strategy composed of servo ring and pressure ring. Servo loop has completed the closed loop of the servo position control, which overcomes complicated friction configurations. The pressure ring consists of a feedforward controller and a closed-loop feedback controller to overcome the problems of hydraulic hysteresis; Then, the electrical and hydraulic characteristics of inlet and outlet solenoid valves in the hydraulic control unit are analyzed based on the hardware-in-the-loop test bench and the rate of pressure increase/reduction of inlet and outlet valves is calibrated. According to the test results, a combined control strategy of wheel cylinder pressure is designed, which can realize single wheel pressure regulation and multi-wheel pressure regulation. Finally, the algorithm is tested by simulation test and hardware-in-the-loop test bench. The results show that the wheel cylinder pressure control strategy designed in this paper can achieve good wheel cylinder pressure control effect of 1-Box.
- Citation
- Zhang, J., Li, L., Jiang, H., Liu, Q. et al., "Active brake wheel cylinder pressure control based on integrated electro-hydraulic brake system," SAE Technical Paper 2022-01-0342, 2022, .