METHOD AND APPARATUS FOR ESTIMATING CLUTCH FRICTION COEFFICIENT

摘要

A method for estimating a transmissibility of a clutch in a vehicle powertrain, comprises the steps of : a) cutting off fuel supply of an engine driving a first side of the clutch, b) setting a clutch pressure between first and second sides of the clutch to a positive value at which there is a non-zero difference between angular accelerations at the first and second sides of the clutch (S3, S4), c) deriving said estimated transmissibility from a deviation between said angular acceleration difference and an angular acceleration caused by a drag torque of the engine (S7).