Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1992-12-23
1993-09-28
Oberleitner, Robert J.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 92, 3031192, 13762565, B60T 836
Patent
active
052481913
ABSTRACT:
A pressure control valve for use in an automobile braking system includes a spool slidably movable for providing selective fluid communication between a pressure fluid source, a wheel cylinder, and a reservoir. The spool has, or is associated with, a pressure-bearing member responsive to a fluid pressure from the wheel cylinder, for applying a first biasing force to the slidable member to urge the slidable member to a position in which the wheel cylinder and the reservoir communicates with each other. An electromagnetic coil responds to an electric signal for generating an electromagnetic force to urge the slidable member to the above position. The slidable member is normally biased by a spring under a second biasing force, greater than the first biasing force, to urge the slidable member to a position in which the pressure fluid source and the wheel cylinder communicate with each other. The fluid pressure in the wheel cylinder is regulated to cause the sum of the fluid pressure in the wheel cylinder and the electromagnetic force from the electromagnetic coil to counterbalance the second biasing force.
REFERENCES:
patent: 3682513 (1972-08-01), Oberthur
patent: 4844119 (1989-07-01), Martinic
patent: 4902075 (1990-02-01), Uno et al.
patent: 4915459 (1990-04-01), Hashida et al.
patent: 5018797 (1991-05-01), Takata
Goshima Takahiro
Kamiya Masahiko
Kondo Masuhiro
Wakata Hideo
Yogo Kazutoshi
Ballato Josie A.
Nippondenso Co. Ltd.
Oberleitner Robert J.
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