Development of Atmospheric Air-level Emission Vehicle Technology for Gasoline Engines 2009-01-1076
Exhaust emissions of a test gasoline engine were successfully reduced to 1/30 of the SULEV standards with the aim of minimizing the impact on the atmospheric environment. This reduction was achieved by reducing engine-out emissions from engine startup and by reconciling faster catalyst light-off with suppression of catalyst thermal degradation to avoid a decline in conversion efficiency. Specifically, a new intake gas flow control device and a low heat mass spark plug with high ignitability were developed for promoting post-oxidation of unburned HCs in the combustion chamber thus markedly reducing engine-out emissions, while ensuring acceptable drivability. The conflicting requirements for quicker catalyst light-off and avoidance of catalyst thermal degradation have been achieved at unprecedented levels by developing a new bypass-type exhaust manifold. Moreover, the adoption of an HC trap catalyst developed in-house at Nissan also contributed to the attainment of cleaner emissions at levels equal to 1/30 of the SULEV standards. The levels achieved are comparable to the atmospheric concentrations of the measured species in urban areas.
Citation: Inoue, K. and Mitsuishi, S., "Development of Atmospheric Air-level Emission Vehicle Technology for Gasoline Engines," SAE Technical Paper 2009-01-1076, 2009, https://doi.org/10.4271/2009-01-1076. Download Citation
Author(s):
Koichi Inoue, Shunichi Mitsuishi
Affiliated:
Nissan Motor Co., Ltd
Pages: 8
Event:
SAE World Congress & Exhibition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Advanced Catalysts and Substrates, 2009-SP-2253
Related Topics:
Exhaust emissions
Combustion chambers
Low emission vehicles (LEV) and zero emission vehicles (ZEV)
Exhaust manifolds
Catalysts
Emissions
SAE MOBILUS
Subscribers can view annotate, and download all of SAE's content.
Learn More »