Failed booster back-up braking system

Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal

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Details

188358, 303 14, 303 10, 3031133, 3031141, 30312212, 303155, 303166, 303DIG4, 3031161, B60T 832

Patent

active

057094381

ABSTRACT:
A back-up power assisted braking system substitutes an intermittently actuated secondary source of pressurized hydraulic fluid such as a traction control/anti-lock pump and motor (41) for the normal braking power assist upon the detection of a failure in the primary power assisted braking system. A failure may be detected in responsive to sensing simultaneous brake pedal (23) displacement and a lack of fluid flow for providing an abnormality signal. Also, a failure may be detected by sensing a predetermined difference between the commanded braking force (45) and the actual braking forces (38, 49). There is a pressure transducer (45) which provides an indication of brake pedal commanded braking force and a hydraulic circuit (43, 53 or 55, 51) interconnecting the secondary source outlet, the individual wheel brake actuators (14) and secondary source inlet. A normally open solenoid operated valve (31, 47) is interposed in the hydraulic circuit between the wheel brake actuators and the secondary source inlet, and a control arrangement is coupled to the pressure transducer to provide an output voltage for enabling the solenoid of the solenoid operated hydraulic valve having a magnitude which varies directly as the indicated operator commanded braking force. Thus, the voltage level determines the braking force during back-up braking.

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patent: 4812777 (1989-03-01), Shirai
patent: 4919493 (1990-04-01), Leiber
patent: 5031968 (1991-07-01), Takata
patent: 5044697 (1991-09-01), Longyear et al.
patent: 5190358 (1993-03-01), Holzmann et al.

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