Patent ID: 8874320

Claim:
A method for determining an understeering ratio of a vehicle provided with: electric power steering (EPS) including an electric assistance motor driven by an onboard electronic computer, the method including the following steps: a sensor providing a first piece of information on a real angular position of a steering wheel, a wheel anti-lock braking system providing a second piece of information on a speed of wheels of the vehicle, processing the second piece of information by the onboard electric computer of the electric power steering to estimate a theoretical angular position of the steering wheel, and comparing the theoretical angular position of the steering wheel to the real angular position of the steering wheel in order to deduce the understeering ratio of the vehicle, using the understeering ratio such that the electric assistance motor modifies the torque felt in the steering wheel to push a driver to return to a correct trajectory, adapting the modification of the torque felt in the steering wheel to the type of trajectory deviation having an understeering or an oversteering such that during the understeering, the driver is pushed to return the steering wheel to its reference position, and during the oversteering, the driver is pushed to counter-steer.