Piston Slap Motion and Engine Noise under Low Temperature Idling Operation of Diesel Engines

Diesel engines make a shrill noise called "idle knock" under low temperature idling operation. This causes a serious noise pollution problem in automobile diesel engines. It was clarified by this study that one important source of this noise was piston slap impulse. Piston slap motion was...

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Bibliographic Details
Published in:SAE transactions 1983-01, Vol.92, p.173-186
Main Authors: Furuhama, Shoichi, Hirukawa, Koji
Format: Article
Language:English
Subjects:
Center of gravity
Combustion
Cylinders
Engine noise
Engines
Low temperature
Noise temperature
Pistons
Skirts
Vibration
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Summary:Diesel engines make a shrill noise called "idle knock" under low temperature idling operation. This causes a serious noise pollution problem in automobile diesel engines. It was clarified by this study that one important source of this noise was piston slap impulse. Piston slap motion was measured under usual operating conditions and a condition with additional oil supplied into the piston clearance. The piston slap motion was calculated, taking into account the frictional resistances of the crank mechanism and squeeze action of oil film. It was concluded that only a negligible amount of oil existed in the piston clearance for the squeeze action.
ISSN:0096-736X
2577-1531