Electrical power assisted steering system for motor vehicle, has sequential circuit that progressively decreases damping torque when determination circuit finds that steering wheel state is transferred from restoring zone to steering zone

摘要

The system has a damping torque evaluation circuit (35) to calculate a damping torque based on steering angular speed of a steering rod. A sequential circuit (40) progressively decreases the torque, which is produced for a restoring zone of the steering wheel in a specific time when a determination circuit (39) determines that the steering wheel state is transferred from the restoring zone to a steering zone.