Pump drive motor control apparatus

Details Pump drive motor control apparatus Pump drive motor control apparatus

2007-12-04

2007-12-04

Williams, Thomas (Department: 3683)

Fluid-pressure and analogous brake systems

With pump

C303S116100

Reexamination Certificate

active

10941002

ABSTRACT:
A pump drive motor control apparatus controls a motor used for driving a hydraulic pump. Every time the supply of electricity to the motor is resumed (every time the motor control signal changes from a low level to a high level), the apparatus measures a time which the voltage generated by the motor requires to decrease by a predetermined amount, the time indicating the decreasing speed of the generated voltage. The apparatus normally sets the high-level maintenance time, in which the motor control signal is maintained high, to a base time. When a state in which the measured time is not longer than a reference time is detected a predetermined number of times (3 times) or more, the apparatus determines that the load of the pump is heavy. In such a case, the apparatus increases the average rotational speed of the motor by increasing the high-level maintenance time.

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patent: WO99/55566 (1999-11-01), None
German Office Action dated Feb. 7, 2006 (with English translation).

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