Automatic transmission hot mode management

摘要

A multi-ratio automatic transmission (16) has a plurality of fluid operated clutching devices, a fluidic torque converter (14) and a fluid operated torque converter clutch mechanism. During certain operational periods, a hot mode is invoked to eliminate certain heat sources and increase heat dissipation to thereby prevent the fluid temperature from exceeding a predetermined maximum temperature (Tmax). The hot mode is invoked as a function of both the temperature of the transmission fluid (TRANTEMP) and the rate of change of the fluid temperature (DELTEMP).