Fluid-pressure and analogous brake systems – Speed-controlled – With failure responsive means
Patent
1995-12-01
1997-12-09
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
With failure responsive means
303 3, 30312213, 3031131, 303 11, B60T 1312
Patent
active
056952600
ABSTRACT:
A control apparatus is provided for a fluid pressure circuit in a motor vehicle. The control apparatus may include a first fluid pressure detector that detects a fluid pressure in an accumulator, and that switches between two states when the detected fluid pressure reaches a first fluid pressure setting P1. A second fluid pressure detector may also be provided that switches between two states when the detected fluid pressure reaches a second fluid pressure setting P2 that is lower than the first fluid pressure setting P1. The control apparatus may also include a timer that counts the period during which the fluid pressure detected by the second fluid pressure detector is less than the second fluid pressure setting P2, and a trouble evaluation system that evaluates whether there is a problem in the first or second fluid pressure detector by determining whether the first and second fluid pressure detectors are indicating different states, and whether the period detected by the timer is also equal to or greater than a predetermined value.
REFERENCES:
patent: 4699435 (1987-10-01), Wupper
patent: 4848847 (1989-07-01), Reinartz et al.
patent: 5000520 (1991-03-01), Schmitt
patent: 5375506 (1994-12-01), Hashida et al.
Tanaka Hirohisa
Yoshino Masato
Graham Matthew C.
Sumitomo Electric Industries Ltd.
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