Alternative Fuels: Design for one or more fuels
Single fuel vehicles (SFV):.Alternative SFVs are designed to operate with one fuel that is other than gasoline or diesel.
Flex-fuel vehicles (FFV): FFVs are constructed with a single drive system and single fuel tank, but the engine may operate on different fuels. FFVs provide options for operation with a choice of fuels, depending on what is available. Some examples of pairs of fuels currently used in FFVs are [1-2]:
FFVs are now common in Brazil after decades of government subsidy for the development of ethanol as a vehicle fuel. Last year over one million FFVs were sold in Brazil (70% of the market) that were designed to run on a blend of 22% ethanol/78% gasoline, or nearly pure ethanol [4].
Bi-fuel vehicles (BFV): BFVs have two separate fuel systems (storage tanks) with the capability of drawing from one or the other. Some examples of fuel combinations in current BFVs are:
References