Title: NO_x reduction in diesel engines using rate shaping and pilot injection

Authors: Mohammad Ghaffarpour, Alireza R. Noorpoor

Addresses: Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, 842 Taylor Street, 2039 ERF, MC 251, Chicago, IL 60607, USA. ' Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, 842 Taylor Street, 2039 ERF, MC 251, Chicago, IL 60607, USA

Abstract: Reduction in NO_x and soot in light and medium duty diesel engines and meeting the US emission standards is an important challenge. This paper shows how Injection Rate Shaping (IRS) should be performed to reduce NO_x while engine performance and soot formation remain almost constant. Effects of intercooler with and without rate shaping on NO_x reduction will be investigated. Results indicated that the rate shaping and pilot/split injection was an effective technique to reduce NO_x at some operating condition. Combined effects of intercooler and rate shaping have shown a reduction of NO_x by 50% for some operating conditions. At idle condition, a split injection was found to be a good solution for NO_x reduction. A combustion simulation computer program was used in this analysis for six different operating conditions. It was found that the cost of modification of the production line is negligible for mass injector production.

Keywords: combustion simulation; nitrogen oxide reduction; diesel engines; injection rate shaping; pilot injection; engine performance; soot formation; air pollution; vehicle emissions; emission standards; intercooler; mass production; modification costs.

DOI: 10.1504/IJATM.2007.013381

International Journal of Automotive Technology and Management, 2007 Vol.7 No.1, pp.17 - 31

Published online: 24 Apr 2007 *

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