Electric power steering apparatus
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United States of America Patent
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-
Mar 3, 2015
Grant Date -
Dec 4, 2014
app pub date -
May 28, 2014
filing date -
May 28, 2013
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An electric power steering apparatus includes an electric motor configured to apply an assist torque to an steering system of a motor vehicle, a rotational quantity detection unit for detecting a rotational quantity of the electric motor while the rotational quantity detection unit is in a wake-up state, and a counter electromotive voltage detection unit for detecting a counter electromotive voltage of the electric motor. When a main power supply of the electric power steering apparatus is turned off, the rotational quantity detection unit enters into a sleep state, and when a prescribed condition is established based on the counter electromotive voltage detected by the counter electromotive voltage detection unit, the rotational quantity detection unit transitions from the sleep state to the wakeup state.
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