Active tram hydraulic braking system with high speed switch valve

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Active tram hydraulic braking system with high speed switch valve

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TANG JINSONG / ZHANG XIAOWEI / CUI LEI / LI JIABAO / HAO BAOLEI

The invention provides a hydraulic braking system. The system comprises a hydraulic unit, an active braking cylinder and an energy accumulator, wherein the hydraulic unit comprises an oil tank, an oil returning system, an oil conveying system and a brake control system, wherein a closed-loop control circuit is arranged on the brake control system; and the brake control system comprises two two-position three-way valves. Through controlling a first high speed switch valve to be electrified or lose electricity, the active braking cylinder is controlled to be communicated or disconnected with the oil tank; through controlling a second high speed switch valve to be electrified or lose electricity, the energy accumulator is controlled to be communicated or disconnected with the active braking cylinder; the pressure of the active braking cylinder is adjusted to control the braking pressure in a closed loop; and through controlling a second solenoid valve to be electrified or lose electricity, the active braking cylinder is controlled to be disconnected or communicated with the energy accumulator so as to realize brake holding or dead electricity automatic emergency brake of a vehicle. According to the hydraulic braking system provided by the invention, the accurate closed-loop control of the braking pressure of the active braking cylinder is achieved; and requirements of brake, brake holding and dead electricity automatic emergency brake of the vehicle are satisfied.