Accurate Control of Air-Fuel Ratio for Gasoline Engine under Idle Speed Condition

Abstract:

In order to achieve a good idle speed stability, emission and economic effect for spark ignition engine, the air-fuel ratio has to been controlled under idle conditions. In this paper, an engine model for a 125cc EFI motorcycle engine was established using the GT-power software, and a simulation and experimental study was performed when engine under idle speed condition. The result shows that there is a corresponding relationship between the idle speed and the air fuel ratio. An accurate control method for setting optimal working air-fuel ratio under idle speed condition can be obtained using the results of this study.

• Periodical: Advanced Materials Research (Volumes 588-589)
• Pages: 303-308
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.588-589.303
• Online since: November 2012
• Authors: Chang Wen Liu, Er Lin Ma, Yan Xiang Yang
• Keywords: Air-Fuel Ratio, Gasoline Engine, GT-Power, Idle Control

References

[1] Fan Lin, Pei Pucheng, Yang Wu. Idling Control Schemes for Electronically Controlled Gasoline Engine . Automotive Engineering, 2002, 24(6): 490-506 (in Chinese).

[2] Zhong Shaohua, Jin Guodong, Xie Tianfeng. Design and Analysis Method for Internal Combustion Engine Mufflers Based on GT–power Software. Automobile Technology, 2003 (7): 7-10(in Chinese).

[3] John B. Heywood. Internal Combustion Engine Fundamentals, New York McGraw-Hill Book Company, 1988：304~307.

[4] Hendricks E, S.C. Sorenson. Mean value modeling of spark ignition engines. SAE Paper 960616.

DOI: 10.4271/900616