Re:The electricity still comes from fossil fuels!
on
Hybrid Fleet Vehicles
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· Score: 1
This is a moot point, because the electricity used in an HEV does not come from the grid. The electric motor provides the additional power needed for acceleration, and recharges by converting the kinetic energy loss from breaking into electricity. Since there is less energy obtained from braking than there is lost from acceleration (because of friction, and the efficiency of the electric motor) some electricity is also generated when the motor is running at steady state.
The key is that an HEV system has an energy management system. The only time a normal car really needs all of its power is when you are accelerating, the rest of the time you have an engine that is much larger than what you need. A normal car also loses all its kinetic energy to heat (through friction with the brake pads) when it stops, instead of converting the energy to electricity and using it to accelerate when you start moving again.
The key is that an HEV system has an energy management system. The only time a normal car really needs all of its power is when you are accelerating, the rest of the time you have an engine that is much larger than what you need. A normal car also loses all its kinetic energy to heat (through friction with the brake pads) when it stops, instead of converting the energy to electricity and using it to accelerate when you start moving again.
How is this possible?