Toyota FCHV

The Toyota FCHV is a current hybrid hydrogen fuel cell vehicle development programme, which was leased to a limited number of drivers in the USA and Japan beginning in 2002.

"FCHV" stands for "Fuel Cell Hybrid Vehicle". A number of prototypes have been produced, up to the latest FCHV-adv ("advanced"). The FCHV designs are based on the first generation Highlander SUV, although a bus version is also in development. The powertrain consists of a 90 kW fuel cell supplied from onboard compressed hydrogen tanks, and a nickel–metal hydride battery in parallel. Battery and fuel cell can provide power to the 90 kW driving motors either singly or together. The mechanism is very similar to the Hybrid Synergy Drive in the Toyota Prius and Toyota Auris HSD but with the fuel cell replacing the petrol internal combustion engine, thus minimising greenhouse gas emissions at point of use.

At low speeds the FCHV can run on battery alone, with a range of about 50 km (31 mi). For high performance, such as when accelerating from rest, the fuel cell and battery supply power in tandem. The battery can also charge by regenerative braking, improving overall efficiency. There are currently five generations of the FCHV, beginning with preliminary prototypes FCHV-1 (1997) and FCHV-2 (1999). The FCHV-3 was presented at the "International Symposium on Fuel-Cell Vehicles" in March 2001 in Tokyo, and the FCHV-4 was the first production version, although Toyota did not plan a full-scale commercial hydrogen fuel cell vehicle launch until around 2015.

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