Cycle resolved no emissions and its relation with combustion chamber pressure in an s.i. engine with fast response no analyzer |
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Authors: | Jung?Min?Sung Hyun-Woo?Kim Email author" target="_blank">Kyung-Hwan?LeeEmail author |
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Affiliation: | (1) Division of Mechanical and A utomotive Engineering, Sunchon National University, 315 Meagok Dong, 540-742 Suncheon Jeonnam, Korea |
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Abstract: | A fast response NO analyzer was applied to investigate the relation between cycle-by-cycle NO emissions and combustion chamber
pressure. NO emissions were sampled at an isolated exhaust manifold of 4-stroke spark ignition engine to avoid the interference
of exhaust gas from other cylinders. The linear correlation analysis was performed with collected data of NO emissions and
combustion chamber pressure with respect to the various air-fuel mixture ratios and engine loads. The sampled data sets were
obtained during 200 cycles at each operating condition. The results showed that there was a typical pattern in NO emissions
from an exhaust port through a cycle. It was possible to set a block of crank angle in which the linear correlation coefficient
between NO emissions and combustion chamber pressure was high. As the engine load increased, NO emissions were more dependent
on combustion chamber pressure after TDC. It was also analyzed that the correlation between two parameters with respect to
air-fuel mixture ratio tended to increase as mixture went leaner. Furthermore, this correlation coefficient for the mixture
near the lean limit seemed to be kept high even though combustion was unstable. |
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Keywords: | Linear Correlation Coefficient Fast Response NO Analyzer NO Emissions Equivalence Ratio |
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