Technical Paper
The Effect of Fuel Processes on Heavy Duty Automotive Diesel Engine Emissions
1995-10-01
952350
The effect of fuel quality on exhaust emissions from 2 heavy duty diesel engines has been measured over the ECE R49 test cycle. The engines were selected to represent technologies used to meet Euro 1 and 2 emission standards (1992/93 and 1995/96); engines 1 and 2 respectively. The test fuels were prepared by a combination of processing, blending and additive treatment. When comparing the emissions from engines 1 and 2, using base line data generated on the CEC reference fuel RF73-T-90, engine technology had the major effect on emission levels. Engine 2 reduced both particulate matter (PM) and carbon monoxide (CO) levels by approximately 50%, with total hydrocarbon (THC) being approximately 75% lower. Oxides of nitrogen (NOx) levels were similar for both engines. The variations in test fuel “quality” had marginal effects on emissions, with the two engines giving directionally opposite responses in some cases.