Steering damper system

摘要

The invention generates a damping force in a steering damper only upon an unintentionally caused handle action when it is truly necessary to restrain the turning of the handle, according to whether the cause of a handle action is intentional or unintentional. In the invention, a rotation type steering damper (10) is provided coaxially with a steering shaft, and generation of a damping force or zero damping force is selected through changeover by a variable valve (38) provided in a bypass passage (37) for communication between a right liquid chamber (34) and a left liquid chamber (35) of the steering damper (10). The changeover is controlled by a control device (40), which functions based on the direction of a moment exerted on the steering shaft detected by a moment sensor (31) and the magnitude and direction of a rotational angular velocity concerning the turning of the steering shaft detected by a rotational angular velocity sensor (41), and so controls that a damping force is generated only when an unintentionally caused handle turning action opposite in direction to the moment is present and the rotational angular velocity has exceeded a predetermined threshold value. <IMAGE>