Fluid-pressure and analogous brake systems – Pipeless valves
Patent
1988-09-29
1989-09-26
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Pipeless valves
303DIG3, 303DIG4, 303116, B60T 888
Patent
active
048695580
ABSTRACT:
A testing device tests the brake fluid pressure circuit in an antilock control system for a motor vehicle. The testing device has a pressure switch provided in the line between a pump and a pressure accumulator in the brake fluid pressure circuit and a pressure switch detection adapted to give ON signals after the pressure indication of the pressure switch has risen above a predetermined point and give OFF signals after it has decreased below a predetermined point. If the signals fail to change from ON to OFF within a given time after issuing a command to release the pressure in the accumulator and if they fail to change from OFF to ON within a given time after issuing a command to pressurize the accumulator, the circuit is judged to be in an abnormal state.
REFERENCES:
patent: 3948568 (1976-04-01), Leiber
patent: 4357054 (1982-11-01), Leiber
patent: 4462642 (1984-07-01), Leiber
patent: 4478461 (1984-10-01), Leiber
patent: 4484784 (1984-11-01), Leiber
patent: 4555144 (1985-11-01), Belart et al.
patent: 4728156 (1988-03-01), Burgdorf et al.
patent: 4753492 (1988-06-01), Leiber et al.
Butler Douglas C.
Sumitomo Electric Industries Ltd.
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