Charge-depleting
Encyclopedia
Charge-depleting or EV mode refers to a mode of vehicle operation that is dependent on energy from the battery pack
. Battery electric vehicle
s 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 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.
Battery pack
A battery pack is a set of any number of identical batteries or individual battery cells. They may be configured in a series, parallel or a mixture of both to deliver the desired voltage, capacity, or power density...
. Battery electric vehicle
Battery electric vehicle
A battery electric vehicle, or BEV, is a type of electric vehicle that uses chemical energy stored in rechargeable battery packs. BEVs use electric motors and motor controllers instead of, or in addition to, internal combustion engines for propulsion.A battery-only electric vehicle or...
s 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
State of charge
State of charge is the equivalent of a fuel gauge for the battery pack in a battery electric vehicle , hybrid vehicle , or plug-in hybrid electric vehicle...
(SOC) threshold, exhausting the vehicle's all-electric range
All-electric range
All-electric range is the driving range of a vehicle using only power from its electric battery pack to traverse a given driving cycle. In the case of a battery electric vehicle, it means the total range per charge. For a plug-in hybrid , it means the range of the vehicle in charge-depleting mode...
(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
National Renewable Energy Laboratory
The National Renewable Energy Laboratory , located in Golden, Colorado, is the United States' primary laboratory for renewable energy and energy efficiency research and development. The National Renewable Energy Laboratory is a government-owned, contractor-operated facility; it is funded through...
) simulations 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.
External links
- Enova Hybrid Drive Installed in First Production Hybrid School Buses
- AQMD Plug-in Hybrid Vehicle Technical Forum: Li-Ion Technically Ready, Manufacturing a Big Barrier
- Enova Offering its Hybrid Drive Systems for OEM or Retrofit Applications with Plug-In Option
- Plug-ins Progress
- Enova Systems Confirms Recent Awards Will Utilize Its Unique
- Mechanical Configurations of Hybrid Electric Vehicles
- Charge Sustaining and Charge Non-Sustaining Hybrids