Fluid-pressure and analogous brake systems – Pipeless valves
Patent
1985-05-15
1988-03-01
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Pipeless valves
303114, 303119, 303DIG4, 303 20, B60T 888
Patent
active
047281561
ABSTRACT:
An apparatus for monitoring the pressure of an auxiliary energy source (10, 11, 12) of a slip-controlled brake system for motor vehicles comprises at least two switches responding when falling below a pressure limit value(p.sub.1), releasing warning signals and influencing the function of the brake slip control. Through logical operation of the switch functions, failure of a switch (ws1, ws2) will be detected and an error signal derivable therefrom resulting in the partial shut-down or cut-off of the control. The monitoring circuit responds to two different pressure limit values (p.sub.o, p.sub.u). The brake system is partially shut down or cut off by measuring the interval (.DELTA.T) between the response to the upper and lower pressure limit threshold (p.sub.o and p.sub.u, respectively), locking and then switching on the master valves (21, 22), detecting the reaction on turning on again the master valves etc., and by logical operation of the signals.
REFERENCES:
patent: 4357054 (1982-11-01), Leiber
patent: 4523791 (1985-06-01), Belart et al.
patent: 4550954 (1985-11-01), Leiber
patent: 4557528 (1985-12-01), Leiber
Burgdorf Jochen
Weise Lutz
Alfred Teves GmbH
Butler Douglas C.
Michals William J.
Raden James B.
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