Method for detecting missing driver activity on the steering wheel of a motor vehicle

摘要

The invention relates to a method for detecting missing driver activity on the steering wheel of a motor vehicle, wherein the driver's hand torque exerted on the steering wheel is measured repeatedly and, in the event that the amount of a hand torque variable does not exceed a threshold value in several successive measurements, for missing activity the driver is closed. According to the invention, the amount of the threshold value depends on the surface condition, in particular on the degree of unevenness, of the road surface traveled on. The degree of unevenness of the roadway can be derived from a measured vertical acceleration in the wheel suspension of the vehicle or from deceleration and / or acceleration signals of at least one wheel of the vehicle. Furthermore, the size of a period of time within which several successive measurements of the hand torque are carried out before in the event of a persistent undershoot of the threshold value does not indicate that the driver is not active can depend on the driving speed of the vehicle.