Date of Award
Mechanical, Automotive, and Materials Engineering
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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.
Jeftic, Marko, "Strategies for Enhanced After-Treatment Performance: Post Injection Characterization and Long Breathing with Low NOx Combustion" (2016). Electronic Theses and Dissertations. 5737.