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In Brazilian market, Flex-Fuel vehicles represented over 85% of new light-duty vehicles sold in 2010. These vehicles can use gasoline blended with anhydrous ethanol (18 to 25% v/v), 100% of hydrous ethanol (contains from 6,2 to 7,4% w/w of water) or any blend of these fuels. Some studies regarding Flex-Fuel technology are being made in Brazil, but there are not many published information about fuel properties of different ethanol-gasoline blends. Also, it is important to better understand emissions of aldehydes, unburned ethanol and total hydrocarbons of different ethanol blends on gasoline. A Flex-Fuel engine, 1.4 l, 4 cylinders was tested on a dynamometer. A FTIR (Fourier Transform Infrared analyzer) bench measured aldehydes, unburned ethanol and total hydrocarbons. It was used Gasoline with 25% of anhydrous ethanol was used as a reference fuel (E25). E25 was blended with different hydrous ethanol contents such as 30% (H30), 50% (H50), 80% (H80) and 100% (H100).

Heavy duty diesel engines are homologated for emissions using engine test dynamometers according to predefined emission cycles. In 2012, it was released in the Brazilian market the first diesel heavy duty vehicles with PROCONVE P7 technology (EURO V). The homologation tests include emission measurement according to stationary cycles (ESC) and also transient tests (ETC). For the ESC emission measurement it is possible to use a passive dynamometer, while the transient test requires an active dynamometer. Uncertainty of measurement is an important matter to get accurate emission data, but there are not many published papers about a method for its calculation related to diesel engine emissions. According to this scenario, this paper presents a method to calculate the uncertainty of measurement of legislated pollutants for diesel engines (CO, NOx, THC and particulate matter).