STEERING CONTROL SYSTEM FOR VEHICLE

摘要

PROBLEM TO BE SOLVED: To provide a steering control system for a vehicle capable of smoothly and precisely performing a steering angle control by improving detection accuracy of an angular position of the wheel steering shaft. SOLUTION: An angle sensor 103 identifies an angle phase of a rotating member based on a kind of an identified pattern of the angle phase to detect the angular position of the wheel steering shaft driven by a motor 6. The steering control system identifies a rotational direction based on an identified pattern output of the angle and performs a sampling of the pattern output at a predetermined interval, identifies an order of combination order of the identified pattern of the angle phase in a first sampling and a second sampling following to the first sampling, and determines the number of pattern changes with the rotational direction from the order in the first sampling to the order in the second sampling. The steering control system adds a number corresponding to the number of pattern changes to a counting number when the rotational direction is plus, and decrease a number corresponding to the number of pattern changes from the counting number when the rotational direction is minus in order to identify the angular position of the wheel steering shaft by the counted number. COPYRIGHT: (C)2004,JPO