Title: Performance and emission enhancements of a variable geometry turbocharger on a heavy-duty diesel engine

Authors: Timothy J. Jacobs, Chad Jagmin, Wesley J. Williamson, Zoran S. Filipi, Dennis N. Assanis, Walter Bryzik

Addresses: Texas A&M University, 3123 TAMU, College Station, Texas 77843-3123, USA. ' United States Army, HHC, 10th Mountain Division (G5 Plans), APO AE 09342, USA. ' United States Army, Night Vision And Electronics Sensors Lab, CERDEC, RDECOM, Army Materiel Command, 10221 Burbeck Rd., Fort Belvoir, VA 22060, USA. ' Mechanical Engineering Department, University of Michigan, 1231 Beal Avenue, Ann Arbor, Michigan 48109-2133, USA. ' Mechanical Engineering Department, University of Michigan, 1231 Beal Avenue, Ann Arbor, Michigan 48109-2133, USA. ' Wayne State University, 5050 Anthony Wayne Drive, Detroit, Michigan 48202-3902, USA

Abstract: Variable Geometry Turbochargers (VGTs) have emerged in the heavy-duty diesel market with the simultaneous introduction of Exhaust Gas Recirculation (EGR) in meeting emission standards. From a military perspective, VGTs offer considerable promise of improving low speed torque and overall fuel economy. Despite these gains, nitric oxides (NO_x) emissions generally increase with increased boost. During times when the military can reduce its environmental impact, VGTs can drive EGR and counter the increase in NO_x emissions with relatively minor penalty in particulate matter (PM) emissions. This study highlights the performance and emission enhancements enabled by a VGT on a heavy-duty diesel engine.

Keywords: heavy-duty diesel engines; VGT; variable geometry turbocharger; EGR; exhaust gas recirculation; engine emissions; engine fuel consumption; heavy vehicle systems; nitric oxide emissions; environmental impact; performance enhancement; emission enhancement; military vehicles.

DOI: 10.1504/IJHVS.2008.022241

International Journal of Heavy Vehicle Systems, 2008 Vol.15 No.2/3/4, pp.170 - 187

Published online: 24 Dec 2008 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article