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In the present investigation, tests were carried out to evaluate exhaust emissions of a turbocharged indirect injection diesel engine fuelled with diesel - biodiesel blends. The vehicle was Euro III compliant, fuelled with a typical diesel fuel and used frying oil methyl ester blends at proportions of 2, 5, 10, and 20% respectively. Based on the New European Driving Cycle (NEDC), regulatred and unregulated exhaust emissions were determined over a chassis dynamometer. The use of biodiesel resulted into a significant decrease of HC emissions. NOx and CO emissions exhibited a decreasing trend with the addition of the biodiesel. On the contrary, higher levels of PM emissions were observed. For carbonyl compounds, emissions of acetaldehyde were significantly increased with formaldehyde showing a slight increasing trend.

In this study exhaust emissions from a commercially available motor vehicle with neat diesel fuel and diesel/biodiesel blends have been investigated. The vehicle was a EURO IV class with a turbocharged direct injection engine (TDI) of 2.0 liter displacement. Methyl ester obtained from used frying oil was as the blendstock at proportions of 5, 20, and 50 % by volume. On-board emission measurements were conducted in real-world driving on a specific driving route infrastructure including altitude differentiation, humps, and various alternations on driving conditions, such as frequent accelerations and decelerations. The addition of biodiesel demonstrated a decrease in NOx, CO and smoke opacity emissions. CO2 emissions and fuel consumption showed an increase

The objective of this paper was to evaluate the performance and airborne emissions of a diesel-water emulsion in 4 public buses operated in the area of Athens. The fuels used were a typical automotive diesel from the Greek market, a low sulfur diesel and a diesel-water emulsion of 13 % v/v water in low sulfur diesel. The fuels were characterized by exposing their physicochemical properties according to EN 590. The measurements of emissions of carbon monoxide, unburned hydrocarbons and carbon dioxide did not show any significant differences among the three fuels. The effects on NOx emissions can be termed as mixed, bearing also in mind that they represent engine operation at no load. The beneficial effect of the emulsified diesel fuel could be readily observed in the case of smoke opacity emissions.

In this paper, two diesel fuels were examined in a single cylinder diesel engine under an emissions measurement test of 72 hours total duration. The test cycle included steady state measurements and transient measurements. The two test fuels were a typical automotive diesel fuel, complying with the specifications of the EN 590 European standard for the year 2004 (sulfur content 350 mg/kg), and an ultra low sulfur diesel fuel containing 15% GTL, complying with the specifications of the EN 590 European standard for the year 2008 (sulfur content 10 mg/kg). Exhaust emissions measurements included gaseous pollutants (carbon monoxide, hydrocarbons, nitrogen oxides), and particulate matter emissions. In all cases carbon monoxide and hydrocarbons emissions were very low. Nitrogen oxides emissions did not show a clear trend, indicating that this pollutant is affected mainly by the engine and less by the fuel.