METHOD FOR ESTIMATING CLUTCH ENGAGEMENT PARAMETERS IN A STRATEGY FOR CLUTCH MANAGEMENT IN A VEHICLE POWERTRAIN

摘要

A method is disclosed for estimating clutch engagement characteristics (30) of a friction clutch system in a vehicle powertrain (14, 10, 12, 26). A dynamic model (42) of the system is used under conditions that cause clutch slipping. Algebraic equations defining a functional relationship between clutch torque and an engagement angle have characteristic parameters that are estimated using a non-linear least squares technique (62). A non-linear least squares technique (62) iteratively minimizes the difference between a measured output clutch disk speed and an output clutch disk speed from the system dynamic model (42) for the same inputs until a small insignificant error is reached (64). Parameter estimates are used to compile an estimated clutch engagement characteristic (28).