The Use Of Port Injection Gasoline With Direct Injection Diesel Fuel

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Therefore, natural gas has a tremendous potential to be used in CI engines effectively based on the RCCI concept. Operating a CI engine in the RCCI mode has become possible as the result of new fuel system technology and engine controls. The high octane number fuel used in the literature is often gasoline or ethanol. The U.S. Department of Energy has devoted significant resources to its national laboratories to investigate the practical applications of port-injection gasoline with direct-injection diesel fuel, as seen in recent publications from Oak Ridge16,25, Sandia39, and Argonne National Labs17. Because of the lean gasoline-air mixture in the CI engine cylinder, its lower combustion temperature can reduce engine heat loss, increase fuel efficiency (up to ∼45%), and decrease exhaust pollution. European institutions are also actively exploring gasoline as a CI engine fuel65. Of the passenger cars in Europe, 45% use CI engines due to the efficiency advantage. On the basis of this dual-fuel concept, various fuel injection schemes and piston geometries have been tested74. One study even used a single fuel stock, gasoline, for both port injection and direct injection but added a cetane improver, 2-ethylhexyl nitrate (EHN), to the direct-injection fuel stream to enable autoignition31. These successes suggest that it would of great interest to investigate such dual-fuel operations using two fuels with vastly different reactivity. However, existing studies are predominantly

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