Investigation of the nitrogen oxide reduction characteristics and in-cylinder controls of the regeneration mode of a lean nitrogen oxide trap catalyst in a light-duty diesel engine

Joo Wung Yoon, Simsoo Park

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

This investigation focused on an in-cylinder control method to create a rich atmosphere inside a lean nitrogen oxide trap catalyst. The experimental procedures can be summarized as follows. To adjust to the excess air ratio λ values of 0.92 and 0.96, the air mass was fixed using a limited post-injection quantity from an engine management system, the main injection timing was slightly adjusted to create a rich atmosphere inside a lean nitrogen oxide trap catalyst in advance and the precise λ values were adjusted by regulating the post-injection timing together with the post-injection quantity calculated using the logic of the engine control unit. The results were as follows. First, the main-injection quantity was greatly reduced when a post-injection quantity was supplied. Second, it was verified that the post-injection quantity participated in generating the torque. Third, the overall efficiency was 26-63% and included a storage efficiency of 11-51%, a reduction efficiency of 56-89% and a conversion efficiency of 11-50%. Fourth, to control the lean nitrogen oxide trap catalyst temperature and its performance precisely using a small λ value, which was caused by the post-injection quantity, as the speed (r/min) increased, the air mass supply must be increased more during the rich mode than during the lean mode.

Original languageEnglish
Pages (from-to)1053-1071
Number of pages19
JournalProceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering
Volume227
Issue number7
DOIs
Publication statusPublished - 2013 Jul

Keywords

  • Air mass
  • Coefficient of variance
  • Engine management system
  • Excess air ratio λ
  • Indicated mean effective pressure
  • Lean nitrogen oxide trap catalyst
  • Main-injection quantity
  • Post-injection quantity

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Investigation of the nitrogen oxide reduction characteristics and in-cylinder controls of the regeneration mode of a lean nitrogen oxide trap catalyst in a light-duty diesel engine'. Together they form a unique fingerprint.

Cite this