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Charge-depleting or EV mode refers to a mode of vehicle operation that is dependent on energy from the battery pack. Battery electric vehicles operate solely in this mode. Most plug-in hybrids operate in charge-depleting mode at startup, and switch to charge-sustaining mode after the battery has reached its minimum state of charge (SOC) threshold, exhausting the vehicle's all-electric range (AER). Although there is no technically mandated minimum all-electric range, future state and/or federal legislation may address this for policy purposes.

Another charge-depleting strategy is called blended mode, in which the engine supplements the battery during medium to heavy loads. Although this strategy does not include a purely all-electric mode, early NREL (National Renewable Energy Laboratory) simulations[1][2] indicate that similar fuel savings as compared to conventional plug-in hybrid battery discharge and charge strategies. One advantage of a blended mode is that it may afford the vehicle designer the opportunity to use a smaller and less costly battery pack and traction motor.


  1. ^ NREL/CP-540-30601, Modeling Grid-Connected Hybrid Electric Vehicles Using ADVISOR
  2. ^ NREL/PR-540-40630, Plug-In HEV Vehicle Design Options and Expectations, ZEV Technology Symposium, California Air Resources Board, September 27, 2006

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