Electric power steering system
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United States of America Patent
Stats
-
Jul 9, 2019
Grant Date -
Feb 1, 2018
app pub date -
Jul 26, 2017
filing date -
Jul 27, 2016
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In an electric power steering system, a motor outputs, based on an AC voltage controlled by switching elements using a power-supply voltage from a power source, assist torque for assisting a driver's turning effort of a steering member. A voltage monitor monitors the power-supply voltage, and a determiner determines whether the power-supply voltage is lower than an assistive voltage. The assistive voltage is defined as a voltage that enables the motor to output the assist torque. A temperature detector detects a temperature of each switching element. A motor control unit determines whether the temperature of each switching element is lower than a heat-resistant temperature of the corresponding switching element. The motor control unit controls a motor current when it is determined that the power-supply voltage is lower than the assistive voltage, and the temperature of at least one switching element is lower than the heat-resistant temperature.
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Family
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