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The most serious problem affecting diesel combustion is the exhaust emission problem, specifically, of NOx and smoke. Different measures have been undertaken to reduce these emissions, however, a "tradeoff" always exists. EGR is widely known to reduce NO/ emission, but this usually increases smoke. On the other hand, oxygen enrichment reduces smoke, but at the expense of greater NO, emission. This study investigates experimentally the feasibility of the application of high EGR with 02 enrichment in controlling diesel combustion. A condition was found under which the "tradeoff" was nonexistent . The results show the feasibility of some control of exhaust emissions, with respect to smoke and NOx with the application of high EGR and 02 enrichment.

A Feasibility Study on the Control of Diesel Combustion by High EGR Ratio and Oxygen Enrichment