Abstract
Effect of oxygen components of fuels on exhaust emissions has been investigated by applying an indirect injection (IDI) diesel engine. This research analyzed variation and/or difference of the engine performance and exhaust emission characteristics of the IDI diesel engine by fueling the commercial diesel fuel and four different mixed ratios of oxygenated blended fuels. Effect of the exhaust gas recirculation (EGR) method was analyzed on the NOx emission characteristics. Ethylene glycol mono-n-butyl ether (EGBE) contains 27% of oxygen components in itself, and it is a kind of effective oxygenated fuel of mono-ether group. Smoke emission from the EGBE was reduced remarkably relative to the commercial diesel fuel. The EGBE can supply oxygen components sufficiently at higher diesel engine loads and speeds. It was found that a simultaneous reduction of the smoke and the NOx was achieved with the oxygenated fuel (10 vol-%) and the cooled EGR method (10%).
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