Date of Award

2016

Degree Type

Dissertation

Degree Name

Ph.D.

Department

Mechanical, Automotive, and Materials Engineering

First Advisor

Zheng, Ming

Second Advisor

Reader, Graham

Rights

CC BY-NC-ND 4.0

Abstract

A novel long breathing technique was created to achieve ultra-low NOX emissions with reduced supplemental fuel consumption compared to conventional strategies. Long breathing refers to the use of in-cylinder NOX reduction to prolong the NOX storage (breathing) cycle of a lean NOX trap (LNT). Exhaust gas recirculation (EGR) was used with conventional diesel fuel and steady-state experimental tests identified that engine-out NOX emissions of 0.4 to 0.8 g/kW·hr were suitable for long breathing operation. The results indicated that the reduced engine-out NOX emissions significantly prolonged the NOX storage cycle and decreased the supplemental fuel consumption penalty of the LNT for all of the tested conditions.

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