Method for individual determination of friction value between wheel of vehicle and road surface, involves excluding phase displacement whether actual friction value is larger or smaller than friction value maximum

摘要

#CMT# #/CMT# The method involves predetermining wheel torque according to a defined torque path at a wheel of a vehicle. Wheel rotational speed (omega) and/or a value correlated with the wheel rotational speed are determined based on the wheel torque. A phase displacement between the wheel torque and the wheel rotational speed and/or the value are determined and excluded whether an actual friction value (lambda) is larger or smaller than friction value maximum (lambda max). The actual friction value is determined with respect to the friction value maximum in an iterative process. #CMT# : #/CMT# Independent claims are also included for the following: (1) a regulation- and/or control device (2) a driver assistance system in a vehicle. #CMT#USE : #/CMT# Method for individual determination of a friction value between a wheel of a vehicle and a road surface using a regulation- and/or control device of a driver assistance system (all claimed) e.g. anti-slip regulation (ASR) system and electronic stability program (ESP). #CMT#ADVANTAGE : #/CMT# The method enables determination of the friction value between the wheel of the vehicle and the road surface with sufficient quality. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a graph illustrating a friction value-wheel rotational speed relation. lambda : Actual friction value lambda max : Friction value maximum omega : Wheel rotational speed omega opt : Wheel rotational speed optimum 1 : Actual operating point.