Abstract
This paper will introduce the front drive unit of THS-C (Toyota Hybrid System-CVT), which is the second development stage of Toyota's hybrid system (hereafter THS), and the rear drive unit of E-Four, which is the world's first 4WD electric system. The THS-C and the E-Four went on sale in the Estima in June of 2001. The THS that was mounted in the Prius and went on sale in December 1997 was a "double motor type", that utilized both electric generator and drive motors. In contrast to this, the THS-C is a "single motor CVT type" that features the combination of a single motor with a belt type CVT, which allows it to switch between its electricity generation and drive functions depending on the driving conditions. The THS-C and the E-Four systems have been developed for use in minivan vehicles and 4WD of their respective weight classes, and are able to achieve remarkably good fuel efficiency.
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