The new Prius offers more passenger and cargo room, and an improved hybrid powertrain that offers better acceleration, fuel economy and emissions performance.
The 2004 Prius is equipped with a new high-voltage/high-power Hybrid Synergy Drive powertrain. Like the original Toyota Hybrid System (THS) on the current Prius, Hybrid Synergy Drive is defined as a "full hybrid system." Unlike competitive systems currently on the market, the full hybrid system is capable of operating in either gas or electric modes. There is a third mode in which both the gas engine and electric motor work together.
The major difference between the new Hybrid Synergy Drive concept, and the current THS system is the duration of electric-mode driving and the peak power delivered electrically. The Hybrid Synergy Drive has a 50 percent more powerful 50-kilowatt drive-motor operating at up to 500 volts. This increased voltage and power is enabled by a newly adopted high-voltage power converter. Additionally, the generator in the new Prius has a higher peak operating speed that increases electric-mode operation in city and highway operation. With 50 percent more electric power available and improved low-end torque from the drive motor, a significant boost in acceleration is realized.
Hybrid Synergy Drive is expected to increase fuel efficiency in the new Prius by a further 15 percent over the current Prius EnerGuide-winning rate of 4.5L/100km in the city and 4.7L/100km highway. This will enable Prius to have the best fuel efficiency rating of any midsize vehicle sold in North America, delivering twice the combined distance rating of its closest competitor (more than any current compact sedan).
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