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The Lean Hunting Phenomenon in Gasoline Engines
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English
Abstract
A quite interesting self-excited oscillation phenomenon in engine speed, which may not be explained with the classical theory of mechanical hunting, is studied experimentally. The effects of the various engine operating variables on the phenomenon are examined using a four cycle single cylinder gasoline engine with an inertia governor. It was found that the phenomenon occurs when engines are operated at a lean air fuel ratio under light load conditions, and that the hunting phenomenon is ascrlbable to the temporary shift in air fuel ratio from the steady state value. This shift in air fuel ratio occurs due to the fuel flow delay into the cylinder caused by the fact that the fuel flow into the cylinder cannot follow the movement of the throttle valve.
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Authors
Citation
Tanaka, M., Mochizuki, S., Nishiwaki, N., and Miyake, M., "The Lean Hunting Phenomenon in Gasoline Engines," SAE Technical Paper 871656, 1987, https://doi.org/10.4271/871656.Also In
References
- Den Hartog J.F. “Mechanical Vibrations” McGraw-Hill 1986 282
- Ahrend Taplin “Automatic Feedback Control” McGraw-Hill 1951 66
- Takahashi T. “On the Speed Governing of Internal Combustion Engines I” Journal of JSME 62 483 1959
- Takahashi T. “On the Speed Governing of Internal Combustion Engines II” Journal of JSME 62 484 1959
- Tanaka Munenobu et al. “Transient Response of a Carburetor Engine” SAE Trans. 770046