Charge-depleting or EV mode refers to an operation mode of an
electric vehicle
An electric vehicle (EV) is a motor vehicle whose propulsion is powered fully or mostly by electricity. EVs encompass a wide range of transportation modes, including road vehicle, road and rail vehicles, electric boats and Submersible, submer ...
's
powertrain
In a motor vehicle, the powertrain comprises the main components that generate engine power, power and deliver that power to the road surface, water, or air. This includes the internal combustion engine, engine, transmission (mechanics), trans ...
that is chiefly dependent on the
energy storage
Energy storage is the capture of energy produced at one time for use at a later time to reduce imbalances between energy demand and energy production. A device that stores energy is generally called an Accumulator (energy), accumulator or Batte ...
from the
on-board battery pack.
Battery electric vehicle
A battery electric vehicle (BEV), pure electric vehicle, only-electric vehicle, fully electric vehicle or all-electric vehicle is a type of electric vehicle (EV) that uses electrical energy exclusively from an electric vehicle battery, on-boa ...
s operate solely in charge-depleting mode, and most
plug-in hybrids operate in this mode at startup and switch to
charge-sustaining
A hybrid electric vehicle (HEV) is a type of hybrid vehicle that couples a conventional internal combustion engine (ICE) with one or more electric engines into a hybrid vehicle drivetrain, combined propulsion system. The presence of the electri ...
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.
References
External links
Battery Lifetime Analysis and Simulation Tools Suite National Renewable Energy Laboratory
Enova Hybrid Drive Installed in First Production Hybrid School Buses*
ttps://www.greencarcongress.com/2006/09/enova_offering_.html Enova Offering its Hybrid Drive Systems for OEM or Retrofit Applications with Plug-In OptionPlug-ins ProgressEnova Systems Confirms Recent Awards Will Utilize Its Unique
Automotive technologies
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