Control unit for electric power steering apparatus
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United States of America Patent
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Mar 10, 2009
Grant Date -
Sep 27, 2007
app pub date -
Apr 15, 2005
filing date -
Apr 30, 2004
priority date (Note) -
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Abstract
It is an object of the present invention to provide a control unit for an electric power steering apparatus for accurately detecting an abnormality of a steering angle sensor without forming the steering angle sensor as a double system or using an expensive position detection sensor. The object is achieved by calculating a relative steering angle by using inexpensive position detection sensors disposed at a motor of the electric power steering apparatus to output binary values and comparing a change amount of an absolute steering angle detected by the steering angle sensor and a change amount of the calculated relative steering angle with each other to thereby detect the abnormality of the steering angle sensor.
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