A typical HEV system consists of:- Electric traction motors and controllers, which drive the wheels when the
engine is not driving them - Electric storage systems, such as batteries, ultra capacitors, and flywheels,
which store the electricity needed for powering the electric motor - Hybrid powerplants, such as spark ignition engines or diesel engines, which
share the responsibility of powering the vehicle with the electric motor - Specially designed fuel systems for the hybrid powerplants
- Unique transmissions designed for hybrid power
When driving a hybrid vehicle, the powertrain switches seamlessly between
the internal combustion engine and electric motors, constantly seeking to deliver
the best fuel economy. Typically, when you come to a stop, the gas engine shuts
off. The vehicle is powered by the electric motors at low speeds. When you need
to accelerate hard, both the electric drive and gas engine kick in to get the
vehicle to the desired speed. When braking, a generator activated by the brake
system recharges the hybrid battery, ensuring that the battery stays charged at all
times.