Research on Precise Control Architecture of Servo Master Cylinder Hydraulic Pressure for Integrated Electronic Hydraulic Brake System

A precise control architecture of servo master cylinder hydraulic pressure for integrated electronic hydraulic brake system (IEHB) is proposed in this paper. First, we design a position-pressure dual-loop switching controller. The position loop is used to quickly eliminate the idle stroke, and the pressure loop uses a fuzzy-PI control method to achieve rapid and accurate follow-up for different target pressure. Then, the speed loop of the motor is designed by the improved sliding mode control method and nonlinear disturbance observer. The current loop adopts the PI control method combined with voltage feedforward. In order to increase the motor’s speed, a field weakening control by the gradient descent method is adopted, and the current is restricted to avoid the demagnetization of the permanent magnet. Finally, the co-simulation results of AMESim and MATLAB/Simulink show that under different ramp target pressure or sinusoidal target pressure conditions, the errors of pressure following and speed following are controlled within 1.45bar and 25rpm, respectively, which proves the effectiveness of the proposed control architecture.