An Efficiency-Based Hybrid Mode Selection Model for A P134 Plug-In Hybrid Powertrain Architecture

With ever-stringent fuel economy requirements, hybrid powertrain technology has been widely adopted by automotive OEMs. There are many forms of hybrid powertrain architectures including new concept or developed to adapt to pre-existing engine or transmission systems. This study examined, in particular, the P134 hybrid architecture: topology, functional capabilities, and use cases in vehicle drive, defined hybrid powertrain operating modes, and developed an offline decision model based on given system characteristics: engine, e-motor, and vehicle systems specifications. A control strategy has been developed and implemented for this decision model and torque distribution control algorithm to achieve fuel economy optimization targets. A simulation model was setup for an exemplary target vehicle and WLTC cycle was run to validate the strategy. The simulation yield a near 37% improvement compared with similar 4WD vehicles equipped with conventional powertrain-2.0L TGDI and 6-speed AT.