Comparison Between Lean-Burn and Stoichiometric Technologies for CNG Heavy-Duty Engines
Date Published: 1995-02-01
Paper Number:950057
DOI: 10.4271/950057
Citation:
Corbo, P., Gambino, M., Iannaccone, S., and Unich, A., "Comparison Between Lean-Burn and Stoichiometric Technologies for CNG Heavy-Duty Engines," SAE Technical Paper 950057, 1995, doi:10.4271/950057.
Author(s):
P. Corbo - Istituto Motori-CNR
M. Gambino - Istituto Motori-CNR
S. Iannaccone - Istituto Motori-CNR
A. Unich - Istituto Motori-CNR
Natural gas is a viable alternative fuel to obtain low exhaust emissions. A heavy duty DI Diesel engine was converted to Otto cycle natural gas operation. Two alternative solutions were compared:
lean-burn technology;
stoichiometric feed with three-way catalyst and EGR.
Power and efficiency were similar for the two above solutions, and exhaust temperature resulted similar to the diesel engine in both cases due to the diluted operation.
The lean bum engine met EURO II ECE-R49 limits except for total hydrocarbons. Stoichiometric engine emissions resulted much lower than the limits. Particulate emissions were quite negligible for the two solutions.
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