An electric power assisted steering system comprises a steering mechanism which operatively connects a steering wheel to the road wheels of the vehicle, an electric motor operatively connected to the steering mechanism; a torque signal generator adapted to produce a torque signal indicative of the torque carried by a portion of the steering mechanism, a column velocity signal generator for producing a column velocity signal indicative of the angular velocity of the steering wheel or steering column and a signal processing unit adapted to receive the output signals from the sensing means and to produce therefrom a torque demand signal representative of a torque to be applied to the steering mechanism by the motor. The signal processing means includes a processing means which generates a torque damping component which is representative of the sum of a first column velocity term which is a linear function of column velocity and a second column velocity term which is a function of the square of column velocity, or a higher order factor and in which the torque demand signal is dependent upon the value of the torque damping component.
Electrical power assisted steering system
2015-07-14
Patent
Electronic Resource
English
IPC: | B62D MOTOR VEHICLES , Motorfahrzeuge |