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In a conventional
powertrain, there is a tradeoff between power and efficiency.
If you try to raise one, you reduce the other. All things being
equal, the larger your engine, the lower your gas mileage. Hybrid
Synergy Drive rearranges this relationship. Instead of compromising
or sacrificing, it seeks synergies.
In the new Prius, Hybrid Synergy Drive achieves a more powerful
synergy by boosting the hybrid system's voltage to a maximum
of 500V (up from 274V in the previous Prius). A higher voltage
means that electrical power can be supplied to the motor using
a smaller current to increase efficiency. Or, if current is
kept the same, the higher voltage can be used to raise power.
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In addition to
its high-voltage power circuit, Hybrid Synergy Drive also employs
a higher-performance battery and a higher-speed motor and generator.
Together with enhanced energy management, these enable 1.5 times
the motor power of Toyota's previous hybrid system, while attaining
even greater fuel economy.
Side benefits include "torque on demand," an innovation that
gives added traction on slick roads by taking advantage of the
power split device.
For the driver, the combination of
greater motor power and engine power, plus greater control in Hybrid
Synergy Drive provides a more powerful, smoother and safer driving
experience.
It's a solution whose time has come, just in time.
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| In developing Hybrid Synergy
Drive, Toyota sought ways to strengthen engine and motor power, raise
electric power, and improve energy management for more efficient and
effective control of the energy made available. The benefits are world
leading environmental performance and more powerful acceleration for
a higher "fun to drive" quotient. |
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