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Plug-in Hybrid Electric Vehicle Definitions (PHEV, EREV and REEV)

Andrew A. Frank, Professor Emeritus, Department of Mechanical and Aeronautical Engineering, University of California, Davis



1. Plug-in Hybrid Electric Vehicle (PHEV) definition. The modern PHEV is a hybrid vehicle that is powered by an internal combustion engine and an electric motor. Batteries power the electric motor for the initial "all electric range" of the vehicle. When the batteries run low, the vehicle continues to travel on the engine using fuels such as gasoline, biofuels, natural gas or hydrogen. Batteries can then be recharged whenever the vehicle is parked with access to any source of electricity.

2. Extended Range Electric Vehicle (EREV) definition. EREV is a marketing name for PHEVs made by General Motors and some other automobile companies.

3. Range Extended Electric Vehicle (REEV) definition. REEV is a marketing name for PHEVs made by various Chinese automobile companies.

4. All Electric Range (AER) definition. The capacity of the battery vs. the weight and efficiency of the vehicle determines how many miles a PHEV, EREV or REEV can travel purely on electric power before the internal combustion engine must be used to power further travel of the vehicle. Cost and weight of the battery vs. all electric range needed by the intended customers determine the AER offered in the various PHEVs, EREVs and REEVs made by various vehicle manufacturers.


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