 A number of prototypes have been produced, up to the latest FCHV-adv ("advanced").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.