Evaluation of Exhaust Emissions from a Single Cylinder Diesel Engine Running on a Long Duration Test Cycle

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. Particulate matter emissions are lower for the low sulfur fuel compared to the EN 590 diesel fuel in all cases.