Control Strategy and Function Design Based on Lever Analogy

Lever analogy is very useful in analyzing gear-train including more than one planetary gear sets. The lever analogy is a translational-system representation of the rotating parts for the planetary gear. Applying lever analogy to GM 6T40E transmission, kinematic and dynamic analysis is shown in this paper. Model based shift control strategy is based on dynamic lever analogy. By setting target output torque and desired turbine speed profile, the clutch pressure and torque request to engine can be commanded. With more investigation on lever analogy, enhanced control strategy and new function are already invented.