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.
The Lean Hunting Phenomenon in Gasoline Engines
Sae Technical Papers
1987 SAE International Off-Highway and Powerplant Congress and Exposition ; 1987
1987-09-01
Aufsatz (Konferenz)
Englisch
The lean hunting phenomenon in gasoline engines
Kraftfahrwesen | 1987
|The Lean Hunting Phenomenon in Gasoline Engines - part 2
SAE Technical Papers | 1988
|The lean hunting phenomenon in gasoline engines - part 2
Kraftfahrwesen | 1988
|A simulation of lean hunting in gasoline engines
Kraftfahrwesen | 1991
|A Simulation of Lean Hunting in Gasoline Engines
SAE Technical Papers | 1991
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