Prediction and Analysis of Engine Friction Power of a Diesel Engine Influenced by Engine Speed, Load, and Lubricant Viscosity

Automotive industries made a paradigm shift in selection of viscometrics of engine lubricant, from higher to lower viscosity grade, for improving fuel economy of vehicles. Engine fuel consumption is influenced by friction between the various engine components. Engine friction power (FP) of a direct...

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Bibliographic Details
Published in:Advances in tribology 2014-01, Vol.2014 (2014), p.1-9
Main Authors: Singh, Nishan, Fieldhouse, John D., Gu, Fengshou, Singh, Devendra, Singal, S. K.
Format: Article
Language:English
Subjects:
Analysis of variance
Automotive engineering
Automotive engines
Bearings
Diesel engines
Engines
Filled plastics
Friction
Fuel consumption
Lubricants
Lubricants & lubrication
Piston rings
Studies
Viscosity
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Summary:Automotive industries made a paradigm shift in selection of viscometrics of engine lubricant, from higher to lower viscosity grade, for improving fuel economy of vehicles. Engine fuel consumption is influenced by friction between the various engine components. Engine friction power (FP) of a direct injection diesel engine is calculated from the measured value of in-cylinder pressure signals at various operating conditions. For predicting FP, as a function of speed, load, and lubricant viscosity, a full factorial design of experiments (DOE) was formulated and an empirical correlation was developed. Response surface methodology (RSM) was used for analyzing the dominant parameters and their interactions, which influence engine friction power significantly. Predicted results of engine FP are in good agreement with measured values at all operating points. ANOVA and RSM analysis revealed that the significant parameters influencing engine FP are speed, load, viscosity, speed-load, and speed-viscosity. The effect of engine lubricant viscosity on friction power of a diesel engine was insignificant at low speed, whereas, at high speed, it played a vital role. The empirical relation developed for predicting FP is very useful in estimating engine friction power for various combinations of engine speeds, loads, and lubricant viscosity without running the engine.
ISSN:1687-5915
1687-5923
DOI:10.1155/2014/928015