Fluid-pressure and analogous brake systems – Speed-controlled – With failure responsive means
Reexamination Certificate
2005-11-04
2009-06-02
Williams, Thomas J (Department: 3657)
Fluid-pressure and analogous brake systems
Speed-controlled
With failure responsive means
C303S122090, C303S119200
Reexamination Certificate
active
07540572
ABSTRACT:
A failure detecting apparatus for detecting a failure of a solenoid-operated control valve having a coil, a valve chamber, and a movable member which is movable, while changing a volume of the valve chamber, by an electromagnetic drive force produced upon supplying of an electric current to the coil, so that the solenoid-operated control valve is selectively placed in one of an open state thereof and a closed state thereof, the failure detecting apparatus including a pressure-change detecting device which detects a change of a pressure on at least one of a high-pressure side and a low-pressure side of the solenoid-operated control valve; and a failure detecting portion which detects that the solenoid-operated control valve has failed, when a change of the pressure detected by the pressure-change detecting device upon controlling of the electric current supplied to the coil is smaller than a change of the pressure that results from a change of the volume of the valve chamber caused by a movement of the movable member.
REFERENCES:
patent: 4824182 (1989-04-01), Steffes et al.
patent: 5997106 (1999-12-01), Takayama
patent: 6007163 (1999-12-01), Sawada
patent: 6065734 (2000-05-01), Tackett et al.
patent: 6595599 (2003-07-01), Soga
patent: 6896338 (2005-05-01), Nakayasu et al.
patent: 36 30 342 (1988-03-01), None
patent: 197 45 377 (1998-04-01), None
patent: B2 2546851 (1996-08-01), None
patent: A 2003-205838 (2003-07-01), None
Oliff & Berridg,e PLC
Toyota Jidosha & Kabushiki Kaisha
Williams Thomas J
LandOfFree
Failure detecting apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Failure detecting apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Failure detecting apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4128390