Powertrain
Hybrid Electric Vehicles
Hybrid-electric vehicles (HEVs) combine the benefits of
gasoline engines and electric motors and can be configured to obtain
different objectives, such as improved fuel economy, increased
power, or additional auxiliary power for electronic devices and
power tools.
Some of the advanced technologies typically used by hybrids
such as the Honda Insight, Toyota Prius, and Ford Escape include:
Regenerative Braking.
The electric motor applies resistance to the drivetrain 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.
Automatic Start/Shutoff.
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.
While the Hybrid powertrain has many benefits in the areas of
fuel economy, this technology can adversely impact the environment
through the manufacturing and disposal of a larger battery. In
addition in the case of the hybrid SUV, it can give the driver the
false satisfaction that they are helping the environment, when
actually they are still consuming gasoline at a rate of around 35
mpg.
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