Motor vehicle electric power assisted steering system

Abstract

The processing means, which control the power assisted steering motor (), determine and give consideration to a first steering angle signal (A) determined as a function of the calculation or measurement of the force or torque delivered by the power assisted steering motor () and possibly of the steering torque or force applied by the driver to the steering wheel (), a second steering angle signal (B) determined as a function of the calculation of the measurement of the angular position of the power assisted steering motor (), a third signal (C) of the 'index' type, that is to say of the type emitted for certain angular positions of the steering system (), a convergence signal (D) indicative of the convergence of the steering angle calculations, and a confirmation signal (E) confirming the calculation of the steering angle, the convergence signal (D) being produced thanks to the signal (C) of 'index' type to indicate a confidence level on the estimated steering angle value. The invention can be applied to vehicles that have an automated steering function.