METHOD AND DEVICE FOR DETERMINING LONGITUDINAL TIRE STIFFNESS

A method for determining a longitudinal tire stiffness (K) for at least one wheel on a motor vehicle while the motor vehicle is in operation, may include generating a sinusoidal modulation of an axle drive torque or wheel drive torque necessary for maintaining the current vehicle speed (ν), or a braking torque or recuperation torque necessary for maintaining the current braking power in at least one wheel for a sinusoidal excitation of a wheel rotational rate (ω), such that a sinusoidal oscillation in the wheel rotational rate is induced. The method may also include detecting the resulting sinusoidal oscillation in the wheel rotational rate, determining the amplitude (ω) of the oscillation in the wheel rotational rate induced, and determining longitudinal tire stiffness (K) from the amplitude (ω). A corresponding apparatus for carrying out the method may be included.