Visualization of Lubrication Oil Flowing inside Cylinder Phenomenon during Start Process of Diesel Engine

LI Xiaolun1; 2; LI Xiangrong1; 2; CHEN Yanlin1; 2; ZHAO Weihua1; 2; LIU Fushui1; 2

doi:10.3969/j.issn.1001-2222.2017.06.004

Vehicle Engine ›› 2017, Vol. 0 ›› Issue (6) : 19-24. DOI: 10.3969/j.issn.1001-2222.2017.06.004

Visualization of Lubrication Oil Flowing inside Cylinder Phenomenon during Start Process of Diesel Engine

LI Xiaolun^1,2,LI Xiangrong^1,2,CHEN Yanlin^1,2,ZHAO Weihua^1,2,LIU Fushui^1,2

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Abstract

The phenomenon of lubrication oil flowing inside cylinder was observed by using endoscope technology on a singlecylinder engine. Adopting the methods of image analysis and experimental verification, the reasons of that phenomenon were analyzed and the influences of speed and intake pressure on incylinder oil flow problem were studied under the motored condition during the start process. In addition, the incylinder oil flow and soot emission were researched during the operation process after start. The results show that the phenomenon exists before and after the top dead center or after the bottom dead center of diesel engine when starting engine by dragging at a high speed. The amount of lubrication oil flowing inside cylinder increases when the speed increases and decreases when the cylinder pressure increases. The incylinder oil flow phenomenon during the earlier period of start disappeared with the increase of running time and the soot emission decreases.

Key words

diesel engine / start / motored condition / oil consumption / visualization

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LI Xiaolun1,2,LI Xiangrong1,2,CHEN Yanlin1,2,ZHAO Weihua1,2,LIU Fushui1,2. Visualization of Lubrication Oil Flowing inside Cylinder Phenomenon during Start Process of Diesel Engine[J]. Vehicle Engine. 2017, 0(6): 19-24 https://doi.org/10.3969/j.issn.1001-2222.2017.06.004