Abstract
In order to study the emission and energy consumption performance of plug-in hybrid electric vehicle (PHEV) equipped with electric-mechanical continuously variable transmission (EMCVT), an emission model of exhaust system and an energy consumption model of power source are built based on the character of engine, motor, batteries, EMCVT, and catalyst. Multi-object global optimization of PHEV equipped with EMCVT under the New European Driving Cycle (NEDC) has been carried out based on dynamic programming (DP). In this optimization, battery state of charge (SOC), catalyst monolith temperature, and engine coolant temperature are state variables, motor torque and transmission ratio are control variables, and weighted value of emissions and energy consumption is object variable. The simulation shows that exhaust emissions can be reduced significantly with a small increase in energy consumption.
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