Prediction and Analysis of Engine Friction Power of a Diesel Engine Influenced by Engine Speed, Load, and Lubricant ViscosityReport as inadecuate

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Advances in Tribology - Volume20142014, Article ID928015, 9 pages -

Research Article

University of Huddersfield, Queensgate, Huddersfield, West Yorkshire HD1 3DH, UK

Indian Institute of Petroleum, Mohkampur, Haridwar Road, Dehradun, Uttarakhand 248005, India

Received 7 August 2014; Revised 15 October 2014; Accepted 16 October 2014; Published 9 December 2014

Academic Editor: MichelFillon

Copyright 2014 Devendra Singh et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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.

Author: Devendra Singh,Fengshou Gu,John D. Fieldhouse,Nishan Singh,and S. K. Singal



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