Abstract
Automotive industry is the main moving power of world economy and is the measure a country s prosperity. The increase of vehicle number in exploitation affects our environment. The global concern for cleaner air and environment in general can be seen in passing more stringent emission limits. To meet such regulations how ever, has been one of the main problems for automotive industry for decades and no doubt it will continue to be. The attention has been focused on particulate and NOx emissions from diesel engines due their hazardous effect to human health. During past years diesel engine manufacturers have made a great progress in reducing both particulate and NOx emissions but future regulations appear to be stricter. To meet such future regulations diesel engine and vehicle manufacturers will have work together with fuel and oil manufacturers since the development of automobile technologies and fuel quality are inseparable links.
From the aspect of fuel quality the most essential result of former efforts seems to be drastic reduction of sulphur content that has the greatest effect on particulate and NOx emissions. The second important feature of fuel is aromatics composition.
From that aspect the contribution of aromatics content and composition to diesel engine exhaust emissions has been investigated. Tests have been performed against 8-mode cycle on a 3-cylinder DI-turbo diesel engine with commercial fuels and artificial fuels- made by adding clean substances in to low sulphur fuel to change contents and composition of aromatics.
Test results illustrate that both content and composition of aromatics effect on NOx emissions.
KEY WORDS: diesel fuel, emission, di + aromatics, engine.