Design and Control Methodology of Series–Parallel (Torque and Speed Coupling) Hybrid Drive Train

As discussed in Chapter 5, the series–parallel or, more accurately, the torque/speed-coupling hybrid drive train has some advantages over the series (electrical coupling) and parallel (single torque or speed coupling) drive trains. The torque and speed couplings in this drive train free the engine from the driven wheels in the torque and speed constraints. Consequently, the instantaneous engine torque and speed can be independent of the load …