Patent ID: 7239972

Claim:
A method for setting, in a motor vehicle electrical power steering system which includes a vehicle steering column and a steering assistance motor, a set point of an assistance torque that must be applied to the steering column by the motor, the steering column having an upper part bearing a steering wheel and a lower part which acts on a mechanical steering device, the method including: obtaining information concerning torque exerted on the steering wheel by measuring a first angle with a first sensor at the steering wheel and a second angle with a second sensor at the lower column part, comparing the first and second angles measured, taking into account rigidity of the steering column between locations at which the first and second angles are measured; computing the load on the steering wheel by comparison of positions of the first and second sensors; computing variation of the load on the steering wheel with respect to speeds of rotation of the first and second sensors, PID filtering of the first and second angles measured to obtain torque information for computation of the set point of the assistance torque to be applied to the steering column by the assistance motor; and applying said set point to the steering column by the assistance motor.