Patent ID: 6148951
Filing Date: 2000-11-21
Classification: B62D

Abstract:
A vehicle steering system, comprising:a steering shaft having a steering wheel at an end thereof;a steering device attached to the other end of the steering shaft, and powered by an electric motor;a manual steering torque sensor for detecting a manual steering torque applied from said steering wheel;a normal steering assist torque determining unit for determining a normal steering assist torque according to a manual steering torque detected by said manual steering torque sensor;a vehicle behavior sensor for detecting at least one of a yaw rate and a lateral acceleration of the vehicle;a reactive steering assist torque determining unit for determining a reactive steering assist torque according to said at least one of said yaw rate and said lateral acceleration detected by said vehicle behavior sensors; anda control unit for controlling said electric motor according to outputs from said normal steering assist torque determining unit and said reactive steering assist torque determining unit,wherein said vehicle behavior sensor further comprises a vehicle speed sensor for detecting a traveling speed of the vehicle, said control unit disregarding the output from said reactive steering assist torque determining unit when the vehicle speed detected by said vehicle speed sensor is substantially zero.