Method and apparatus for damping control of an electric power steering system with a function in the case of loss of the principles of the speed signal

摘要

An electric assist steering system includes a vehicle speed sensor that provides a vehicle speed signal. A determination is made as to whether loss of the vehicle speed signal has occurred. Damping of the electric assist steering system is controlled in response to the sensed vehicle speed and in response to a predetermined vehicle speed value when the vehicle speed signal is lost.