Energy Management Strategy for Atkinson Cycle Engine Based Parallel Hybrid Electric Vehicle

Abstract

Energy management strategies are widely used for the fuel efficiency of hybrid electric vehicle (HEV). Most of the on road hybrid cars use Atkinson cycle engine instead of Otto cycle engine, on account of better efficiency. The authors have already proposed a control oriented extended mean value engine model (EMVEM) of the Atkinson cycle engine and also developed and evaluated its control framework. The prior research was limited to evaluate the fuel efficiency of the engine only, while HEV employs both the engine and the motor. The presented work is an attempt to devise and demonstrate energy management strategy (EMS) by giving full consideration to the powertrain using Atkinson cycle engine. A novel energy management strategy based on the vehicle speed for Atkinson cycle engine for HEV is proposed. A parallel hybrid electric vehicle is modeled in Matlab/Simulink through a forward facing simulator. The proposed EMS with Atkinson cycle engine control framework exhibits the significant improvement in the fuel economy around 12.30% for standard Manhattan driving cycle and 7.22% for the modified federal urban driving schedule (FUDS) driving cycle in comparison with the Otto cycle engine.