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Toyota Motor Corporation began leasing a new generation fuel cell vehicle the FCHV (Fuel Cell Hybrid Vehicle) in December 2002. That vehicle includes a new variable voltage power electronics system and uses the Nickel Metal Hydride (Ni-MH) battery system from the Prius hybrid gasoline electric vehicle. This paper describes on-going efforts to model optimum secondary storage systems for future vehicles. Efficiency modeling is presented for the base Ni-MH storage system, an ultra capacitor system and a Lithium ion (Li-ion) battery system. The Li-ion system in combination with a new high efficiency converter shows a 4% improvement in fuel economy relative to the base system. The ultra capacitor system is not as efficient as the base system.

AISIN AW has developed a new full hybrid transmission, the HD-10 for front wheel drive vehicles. This HD-10 has been developed based on the concept for improving fuel economy and performance without sacrificing drivability and utility. To achieve this, the transmission adopts an integrated design, which consists of two electric motors, gears including a planetary gear set, two inverters, and an electronic control unit. In addition, new software has been developed to offer smooth operation in every drive condition.