HEV Fundamentals

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HEV Fundamentals

Mi, Chris / Masrur, M. Abul

This chapter discusses fundamentals of hybrid electric vehicles (HEV). During the design phase of an HEV, it is necessary to select the ratings for the internal combustion (IC) engine, traction electric motor/generator, generator, and energy storage elements based on the desired vehicle performance. It should be noted that in principle it is possible for the same electrical machine to function as either a motor in propulsion mode, or as a generator when its input comes from IC engine, allows the acceptance of mechanical power and converts to electrical energy. However depending on the architecture, there can be a separate electrical machine which can predominantly work as a generator. The design process of an HEV system involves a significant amount of modeling and simulation prior to actual development. The chapter also discusses vehicle road load modeling, specify requirements for vehicle performance and fuel economy, and include two design examples for series hybrid and parallel hybrid vehicles.