Active collision-avoidance system based on novel solenoid valve controlling hydraulic braking and braking method

The invention discloses an active collision-avoidance system based on novel solenoid valve controlling hydraulic braking and a braking method. The active collision-avoidance system comprises a braking pedal sensor, a braking pedal sensing simulator, a wheel speed sensor, an asymmetric hydraulic braking wheel cylinder, a solenoid operated four-way valve, an overflow valve, an oil tank, a hydraulic pump, an energy accumulator, an electronic control unit, a laser radar detection module and a buzzer. A braking master cylinder of a traditional hydraulic braking system is removed, the solenoid operated four-way valve is adopted to replace a complex braking valve, and a traditional braking wheel cylinder is changed into the asymmetric hydraulic braking wheel cylinder. Braking modes can be switched more rapidly by matching the asymmetric hydraulic braking wheel cylinder with the solenoid operated four-way valve, and pressurization, pressure maintaining and pressure reduction of the system can be achieved. The braking pedal sensor is adopted to discover a wrong braking behavior of a driver in time, a vehicle in the front is monitored through a radar system in real time, the distance, direction and relative speed between a vehicle and the vehicle in the front are judged, an alarm can be given if necessary, vehicle active collision avoidance can be achieved through control of an ECU, and it is guaranteed that the vehicle is driven safely.