AUTOMATICALLY CONTROLLED BOOSTED BRAKING SYSTEM WITH MONITORED RESERVE

摘要

The present invention relates to a pneumatic vacuum servo and an automatic control braking system comprising a pneumatic solenoid valve capable of selectively connecting the servo to one or the other of two pressure sources (D, A) via a pipe (15). . In order to prevent the low pressure source D from being discharged, the solenoid valve, on the one hand, is a flap valve 18 which is proportional to the pressure difference generated by the pressure sources D and A and receives a suction force in the same direction as the electromagnet operating force. And on the other hand elastic means 20, 21, 22 which apply an elastic force greater than the suction force in the opposite direction to the flap valve and the generator 19a, 19b also transmits a current of a predetermined maximum strength and It generates less operating force than elastic force.