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The effect of air/fuel ratio on the CO and NOx emissions for a twin-spark motorcycle gasoline engine under wide range of operating conditions

Banglin Deng, Qing Li, Yangyang Chen, Meng Li, Aodong Liu, Jiaqi Ran, Ying Xu, Xiaoqiang Liu, Jianqin Fu and Renhua Feng

Energy, 2019, vol. 169, issue C, 1202-1213

Abstract: In the present study, the possibility and limitation of lean burn in a motorcycle engine were explored, from the aspect of exhaust emissions. The CO and NOx emissions were studied by experimental measurements and combined simulations on a twin-spark motorcycle gasoline engine under wide range of operating conditions. The results illuminated that, the CO emissions drop sharply when air/fuel mixture changed from rich to lean. Particularly, at full load the CO emission decreases by about 4 times when λ changed from 0.85 to 1.1, and it keeps decreasing to only about one-tenth at λ = 1.2. Besides, at λ = 1.1 and full engine load the NO emission is about 2.4 times of that at λ = 0.85. Not so much variation has been observed between λ = 1.1 and λ = 1.2. This indicates enlarging the lean burn range will not further deteriorate NOx emission, but benefit from CO emission by a large margin. It is further found the variation in CO emission amount between λs is not mainly due to which reaction is in favor, but due to the amount of its precursors. Besides, almost all the NO is produced by the thermal-NO mechanism.

Keywords: Air/fuel ratio; CO emission; NOx emission; Twin-spark (search for similar items in EconPapers)
Date: 2019
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