Switched Causal Modeling of Transmission with Clutch in Hybrid Electric Vehicles

The modeling of a clutch in a powertrain transmission is a sensitive issue because of its non-linear behavior. Two different states have to be taken into account: clutch locked and slipping. Two different models are then used and a specific condition defines the commutation between both models with respect to the physical energy flow. An application to parallel hybrid electric vehicles (HEV) is then presented. Energetic macroscopic representation (EMR) is used to organize the numerous blocks required. A Petri net is employed to activate a model according to clutch state (lock and slip)