Hybrid-electric vehicles (HEV) are powered by an internal combustion engine (using conventional or alternative fuel) and an electric motor that uses energy stored in a battery. HEVs do not need to be plugged in. HEVs can also be configured to provide additional auxiliary power for electronic devices and power tools. Some of the technologies HEVs use are:
The electric motor applies resistance to the drive train causing the wheels to slow down. In return, the energy from the wheels turns the motor, which functions as a generator, converting energy normally wasted during coasting and braking into electricity, which is stored in a battery until needed by the electric motor.
Electric Motor Drive/Assist
The electric motor provides additional power to assist the engine in accelerating, passing, or hill climbing. This allows a smaller, more efficient engine to be used. In some vehicles, the motor alone provides power for low-speed driving conditions where internal combustion engines are least efficient.
Automatically shuts off the engine when the vehicle comes to a stop and restarts it when the accelerator is pressed. This prevents wasted energy from idling.