DIAGNOSTICS FOR CLUTCH TORQUE ESTIMATION

摘要

A transmission for a vehicle includes a plurality of clutches that are individually selectively engaged to establish particular power flow paths. The amount of torque flowing through any clutch can be estimated while the clutch is being engaged, being disengaged, or being held locked. The estimated magnitude of clutch torque aids in proper control of the transmission, including how and when to shift between gears. A method and system for determining the uncertainty of estimated clutch torque is provided. Based on the magnitude of uncertainty of estimated clutch torque, the shift schedule can alter to specifically avoid actions that would increase the uncertainty, or the time between shifting gears can increase to reduce the effects of the uncertainty.

主权项

1. A method of operating a transmission comprising:
operating the transmission according to a first shift schedule for a given driving condition; and operating the transmission according to a second shift schedule for the given driving condition in response to a magnitude of uncertainty of estimated clutch torque.