Wheel cylinder pressure identification system and method

The invention discloses a wheel cylinder pressure identification method which comprises the following steps: establishing an ESC high-speed switch valve mathematical model through the pressure difference between two ends of a high-speed switch valve of an electromagnetic valve and the duty ratio of a PWM (Pulse Width Modulation) signal of the electromagnetic valve to obtain the flow calculation information of vehicle hydraulic pressure; establishing a wheel end pressure model through the whole vehicle parameters of the brake caliper body and the brake wheel cylinder; according to the ESC high-speed switch valve mathematical model and the wheel end pressure model, the relation between the wheel cylinder pressure and the flow is obtained; the wheel cylinder brake hydraulic volume and the wheel cylinder pressure are calibrated, the change relation between the wheel cylinder brake hydraulic volume and the wheel cylinder pressure is obtained, and the variable quantity of the wheel cylinder brake fluid volume is ca