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Comparison of Variable Geometry Turbocharging (Vgt) Over Conventional Wastegated Machines to Achieve Lower Emissions
Published November 04, 1997 by Institution of Mechanical Engineers in United Kingdom
This paper represents the results of an extensive testing program conducted at the University of Bath on behalf of the Ford Motor Company on a prototype 1.8 liter direct injection (DI) diesel engine. The testing compared the effects of a standard wastegate controlled fixed geometry turbocharger (FGT) with a variable geometry turbocharger (VGT) at discrete part-load operating points. The object being to evaluate the NOx reduction potential at these points due to the VGT and varying exhaust gas recirculation schedules. A reduction in NOx of up to 45 percent was observed without compromising fuel consumption or smoke levels.