Device for detecting risk of slip of motor vehicle on layer of water or ice covering ground of road, has calculation unit for calculating thickness of ice or water layer at effective contact point using actual and theoretical parameters

摘要

The device has emitters for emitting a light ray (re) towards a point of effective contact (B) with a road (S) located in front of a motor vehicle. Receivers receive a light ray reflected by the point. A measurement unit measures an actual parameter of the reflected ray. A preliminary storage unit stores a theoretical parameter of the reflected ray returned by a theoretical contact point (A), reachable by the same emitted ray, with a road without layer of water (Ea) or ice. A calculation unit calculates thickness (e) of the ice/water layer at the effective contact point using the parameters. An independent claim is also included for a method for detecting a risk of slip of a motor vehicle on a layer of water or ice covering the ground of a road.