Patent ID: 6364811
Filing Date: 2002-04-02
Classification: B60W,F16H,Y02T,Y10T

Abstract:
A method of controlling an on-coming clutch pressure during an inertia phase of an upshift of a motor vehicle automatic transmission having an input shaft coupled to a vehicle engine and an output shaft coupled to drive the vehicle, the method comprising the steps of:developing a desired torque trajectory of the output shaft; developing a desired acceleration trajectory of the input shaft; applying the desired torque trajectory and the desired acceleration trajectory to an inverse dynamic model of the transmission to determine an engine output torque command; commanding engine output torque in accordance with the determined engine output torque command; applying the desired acceleration trajectory to the inverse dynamic model of the transmission during the inertia phase of the upshift to obtain an estimate of a required on-coming clutch pressure at the commanded engine output torque; developing a feed-forward clutch pressure command based on the estimated clutch torque; and developing on-coming clutch pressure in accordance with the pressure command.