Patent ID: 6332860
Filing Date: 2001-12-25
Classification: B60W,F16H,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 acceleration trajectory of the input shaft;applying the desired acceleration trajectory to an inverse dynamic model of the transmission during the inertia phase of the upshift to obtain an estimate of a required on-coming clutch torque capacity at a given output torque level of the engine;developing a feed-forward clutch pressure command based on the estimated clutch torque;developing on-coming clutch pressure in accordance with the pressure command;measuring a speed of the input shaft; andadjusting the pressure command in accordance with a feed-back adjustment based on a deviation of the measured speed from an expected speed of the input shaft to compensate for errors in said dynamic model.