Electric power steerings with digital controllers, was developed for compact cars about 10 years ago and is now in mass production. However, requirement for mounting this system on large-sized vehicles has been increased. Increasing output current of this system without changing control logic causes the current resolution at the time of control to become rough and control precision to drop. As a solution of this problem, the logic of the controller with analogue logic using custom IC is discussedin this report.
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