Pump motor control in electro-hydraulic braking systems
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United States of America Patent
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-
Jul 22, 2003
Grant Date -
Sep 19, 2002
app pub date -
Apr 1, 2002
filing date -
Nov 27, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A vehicle braking system of the type in which a stored volume of fluid is used to apply the wheel brakes of the vehicle under the control of an electronic unit, the stored volume being held in an accumulator arranged to be replenished by pumping additional working fluid using a pump driven by an electric motor. The speed of the pump electric motor is arranged to be controlled in dependence upon whether or not any vehicle dynamic intervention, such as ABS, TC and VSC, is active. If it is deduced that one or more vehicle dynamic functions is active, then the pump is arranged to be run at high/full, and relatively noisy, speed, but if it is concluded that only base braking is being applied with no vehicle dynamic function being active, then the pump is arranged to be operated at a relative slower and hence quieter speed.
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