9) How does hybrid synergy drive work?

The Prius employs a power split device to blend the power of the gas engine, the electric motor, or both, depending on the driving situation. Toyota calls it Hybrid Synergy Drive (HSD). Switching between the differing combinations of power sources is pretty seamless and if it weren’t for the energy consumption screen located in the Prius’ center console, the driver would have little indication the complexity of it all.

Low Loads Under low loads, the Prius can be powered solely by the electric motor with energy coming from the battery pack. This provides for silent driving for short periods of time. This is in contrast to other “mild hybrids” such as Honda Civic, Accord and Insight. The Hondas use the electric motor simply as a power assist to the gas engine, and can never run on the electric motor alone.

Heavy Acceleration
Under heavy acceleration the Prius integrates both the electric motor and the gas engine, again with additional energy coming from the battery.

Highway Speed
At highway speeds the Prius uses the gas engine to move it along with generating additional electricity to the battery via the generator if needed.

Coming To A Stop
When coming to a stop, the Prius turns off the gas engine which improves the gas mileage and keeps the air cleaner.

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Learn more about hybrid cars:

Hybrid Car Technology

Toyota Hybrid Prius

Toyota Hybrid Highlander

Lexus Hybrid RX 400h

Ford Hybrid Escape

Honda Hybrid Accord

Honda Hybrid Insight

Honda Hybrid Civic