Electric control apparatus for rear wheel steering mechanism of wheeled vehicle

摘要

An electric control apparatus for a rear wheel steering mechanism in a four-wheel steering system of a wheeled vehicle is designed to detect a yaw rate of the vehicle body for determining a target steering amount for steering a set of dirigible rear road wheels in accordance with a magnitude of the detected yaw rate in a direction restraining the yaw rate of the vehicle body and to produce a control signal indicative of the target steering amount for applying it to an electrically operated actuator of the rear wheel steering mechanism. The electric control apparatus is further designed to detect a roll angle and/or a roll angle speed of the vehicle body and to determine a correction amount for steering the rear road wheels in accordance with a magnitude of the detected roll angle and/or roll angle speed in an opposite direction relative to the direction restraining the yaw rate of the vehicle body and adding the correction amount to the target steering amount.