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With the discovery of oil and gas in the pre-salt Santos and Campos basin, the supply of natural gas (NG) is expected to increase considerably, so the use of compressed natural gas (CNG) in city buses will be an important option for reducing the overall consumption of fossil diesel fuel and a reduction in operating costs in São Paulo and Rio de Janeiro Metropolitan Areas in Brazil. A vehicle with an engine that can run on pure diesel or diesel and CNG has advantage over a vehicle that works exclusively with CNG, because when there is no availability or the lack of CNG, the vehicle / engine operates with diesel only. Another benefit of this technology is the resale value in Brazil, because after the life cycle of use in theses two big cities, Urban Buses are sold country side to small cities where CNG is not available.

In order to use waste (BIOMASS), such as rice rind, we use a gasification process, which is a form of increasing the energetic use of Biomass. A fluidized bed gasifier at UNICAMP was used with an engine of 5.965 liters of total displacement and 6 cylinders, with compression ratio of 12:1 in the OTTO cycle and which is originally used in vehicles driven by compressed natural gas, to work with low heating power gas (4 to 6 MJ/Nm3) produced by the gasifier. The following values were obtained in the tests: Power ( kW) = 40.7 @ 1800 rpm, Feed (crankshaft degrees) = 30 Exhaust temperature (°C) = 596 Lambda = 1,12 Maximum Combustion Pressure (KPa) = 4000