Method and apparatus to monitor rotational speeds in an electro-mechanical transmission

摘要

A powertrain includes an electro-mechanical transmission (10) mechanically-operatively coupled to an internal combustion engine (14) and an electric machine (56,72) to selectively transmit mechanical power to an output member (64). Powertrain operation includes monitoring operator inputs, and determining input speeds and changes in input speeds for the internal combustion engine (14) and the electric machine (56,72). The input speeds are compared to threshold input speeds, and the changes in input speeds are compared to threshold changes in input speeds. Input torques of the internal combustion engine (14) and the electric machine (56,72) are reduced when any one of the input speeds and changes in input speeds exceeds the corresponding threshold.