Patent 7322438 was granted and assigned to Denso on January, 2008 by the United States Patent and Trademark Office.
An electrically driven power steering control apparatus for a vehicle gives a steering assist torque to a steering mechanism by supplying electric power to an electrically driven motor based on a steering operation made by a driver. This control apparatus detects tiredness of a driver, and restricts an operation of the electrically driven motor based on the detected tiredness of a driver.