HYDRAULIC BRAKING CIRCUIT WITH PNEUMATIC VACUUM SERVOCONTROL AND PNEUMO-HYDRAULIC ANTI-LOCKING DEVICE FOR MOTOR VEHICLES WHEELS

摘要

Hydraulic braking circuit with pneumatic vacuum servocontrol for a motor vehicle equipped with an anti-locking device for the wheels, including a pneumo-hydraulic actuator (32) installed in parallel with the said circuit and connected to the pneumatic cylinder (14) of the vacuum servobrake which acts on the discharge line (26) of the braking circuit to the reservoir (16) of the master cylinder (10). Whilst the initial brake-release action is controlled by a solenoid valve (22) in the hydraulic circuit, the subsequent actions of braking and releasing the brake are controlled by the pneumo-hydraulic actuator (32) which is controlled by an electronic control unit (23) subject to means (30) for sensing the speed of rotation of the wheels.