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Use of a Vgt to Improve the Limiting Torque Characteristics of a D1 Automotive Diesel Engine
Published November 03, 1998 by Institution of Mechanical Engineers in United Kingdom
The paper describes the experimental and modeling investigations that have been undertaken on the use of a variable geometry turbocharger (VGT) to improve the limiting torque characteristics of a prototype 1.8-liter DI diesel engine. The baseline build of the engine with a fixed geometry turbocharger (FGT) was extensively mapped. Replacement of the FGT with the VGTR resulted in a 10 percent increase in torque on the baseline LTC without exceeding the set limiting parameters of maximum cylinder pressure, pre-turbine temperature and exhaust smoke. In conjunction with the experimental evaluation an extensive cycle simulation exercise was conducted which indicated that the baseline LTC could be extended by as much as 15 percent without exceeding the limiting engine operating criteria.