Power steering apparatus
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United States of America Patent
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-
Jun 26, 2001
Grant Date -
N/A
app pub date -
May 14, 1999
filing date -
May 18, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
This invention provides a power steering apparatus for assisting steering by utilizing a hydraulic pump to be driven by an electric motor as a generating source of a hydraulic pressure. A drive voltage determination unit determines a drive voltage so that a rotational velocity of the electric motor detected by a rotational velocity sensor and a rotational velocity detecting circuit becomes a first rotational velocity on the occasion of starting of the electric motor, and determines a gradually increasing drive voltage after the electric motor is started by the determined drive voltage until the detected rotational velocity reaches the second rotational velocity. Therefore, an unnecessary inrush current is not generated in the electric motor, and the rotational velocity of the electric motor does not overshoot.
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