US EPA

4968783 

Journal Article 

Impact factors for the degradation of engine oil causing carbonaceous deposits in the piston's grooves of Diesel engines 

Diaby, M; Singhal, P; Ousmane, M; Sablier, M; Le Negrate, A; El Fassi, M; Zymla, V 

2013 

1 

Fuel
ISSN: 0016-2361
EISSN: 1873-7153 

Elsevier B.V., The Boulevard Kidlington Oxford OX5 1GB United Kingdom 

107 (Apr 22 

Elsevier 

90-101 

10.1016/j.fuel.2012.12.021 

WOS:000316214200009 

https://linkinghub.elsevier.com/retrieve/pii/S0016236112010447
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This study was conducted to better understand the processes of carbonaceous deposits formation in the piston grooves of direct injection Diesel engines. An experimental investigation of parameters affecting the engine oil degradation in the first groove of a Diesel engine was carried out to shed light on the formation of these carbonaceous deposits. A dedicated reactor was designed to reproduce the parameters that exist in the first groove of a Diesel engine used under exhaust gas recirculation conditions, and squalane was used to model the lubricant. The relationship between oil degradation and environmental conditions (temperature, pressure, time, oxygen content and components of the gas in the groove) was clarified by characterizing the degradation levels of the squalane molecule. A general mechanism was proposed to explain the formation of carbon deposits in the first piston grooves of Diesel engines depending on the surrounding atmosphere. The influence of pressure on degradation conditions usually investigated under atmospheric conditions was proposed for the first time to understand processes responsible for carbonaceous deposit formation. 

Oil; Oxygen; Degradation; Fuels; Temperature; Environmental conditions; Atmosphere; Diesel engines; Exhaust emissions; 2013)