Brake fluid pressure maintaining apparatus for vehicles
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United States of America Patent
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Nov 27, 2007
Grant Date -
Jul 22, 2004
app pub date -
Nov 25, 2003
filing date -
Nov 26, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A brake fluid pressure maintaining apparatus for a vehicle, having: a master cylinder; a check valve; and, a normally-open-type electromagnetic valve including an electromagnetic coil, a fixed core, and a movable core, and in the brake fluid pressure maintaining state, it is closed and, in the brake fluid pressure no-maintaining state, it is always opened, and by changing the value of the current, an attracting force is changed; by setting the attracting force at a given value, the brake fluid pressure to be maintained on the wheel brake side is set; and, when it is closed, in case where the brake fluid pressure of the wheel brake is higher than the attracting force of the given value, it is opened against the attracting force to thereby reduce the brake fluid pressure of the wheel brake down to the given value.
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