Method for determining degree of efficiency of transmission at reference-temperature, involves measuring actual-temperature of transmission at time point, and selecting time derivative of temperature from engine characteristic

摘要

The method involves measuring an actual-temperature of transmission (102) at a time point, and selecting a time derivative of the temperature from an engine characteristic (110). The engine characteristic has multiple temporal derivatives of the temperature depending on a transmission characteristic. The selected time derivative of the temperature is multiplied with a pre-defined time-period to determine an estimated temperature of the transmission at another time point.