In-Cylinder Production of Hydrogen During Net-Lean Diesel Operation
Date Published: 2006-04-03
Paper Number:2006-01-0212
DOI: 10.4271/2006-01-0212
Citation:
West, B., Huff, S., Parks, J., Swartz, M. et al., "In-Cylinder Production of Hydrogen During Net-Lean Diesel Operation," SAE Technical Paper 2006-01-0212, 2006, doi:10.4271/2006-01-0212.
Hydrogen (H
2
) is an excellent reductant, and has been shown to be highly effective when introduced into a variety of catalysts such as three-way catalysts, lean NOx traps (LNTs), and hydrocarbon lean NOx catalysts (also termed hydrocarbon selective catalytic reduction (SCR) catalysts). Furthermore, since lean-burn engines offer improved fuel efficiency yet difficult NOx emission control, H
2
production during lean operation for the purpose of NOx reduction could be beneficial. On-board generation of hydrogen is being explored via catalytic or plasma-based reformers. A possible alternative to these add-on systems is generation of the H
2
in-cylinder with standard fuel injection hardware. This paper details experiments relating to the production and measurement of H
2
under net-lean operation in a common-rail diesel engine. In-cylinder fuel control is used to tailor the combustion process such that H
2
is generated while maintaining a lean Air:Fuel ratio in the bulk exhaust gas.
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