Patent ID: 8296016

Claim:
A method for correcting measurements of a torque exerted on a steering wheel of a vehicle electric power-assisted steering system, carried out, when the vehicle is being driven, by a torque sensor disposed on a steering column, the vehicle electric power-assisted steering system comprising an assistance electric motor controlled by an on-board electronic processor using the measurements of the torque on the steering wheel that is measured by the torque sensor, when an instantaneous speed of the vehicle is higher than a predetermined threshold speed, the method comprising: identifying, during a predetermined minimum period of time, that the vehicle is being driven in a straight line, without torque exerted on the steering wheel by a driver of the vehicle, the vehicle being identified as being driven in the straight line when an angular speed of the assistance electric motor is lower than a pre-determined limiting speed; determining a mean residual torque on the steering wheel by calculation of a moving average of the measurements of the torque on the steering wheel; calculating, when the mean residual torque on the steering wheel is higher than a predetermined minimum residual torque, a correction proportional to the mean residual torque to be applied to the measurements of the torque on the steering wheel; applying an effective correction, limited in speed of variation and in amplitude with respect to the correction to the measurements of the torque on the steering wheel, the corrected measurements being processed by the electronic processor in order to control the assistance electric motor.