The Effect of Bio-Fuel Induced Bsfc Curve Perturbations on Realizable ICE Efficiency Using Cycling

Abstract

This paper provides an uncertainty analysis for efficiency gains in internal combustion engines generated by cycling between two operating points. The uncertainties are due to incomplete knowledge of the bsfc field of the engine. In the case of bio fuels, these uncertainties can be fairly large and exact bsfc curves are rarely available. The proposed concept provides a graphical method for determining whether cycling provides efficiency advantages despite the presence of uncertainties. If cycling is beneficial for efficiency, the introduced concept provides the power range those results in efficiency advantages. The proposed method is based on a graphical evaluation in the engine bsfc field, with uncertainties being represented by a bsfc envelope. The decision making criterion is based on the bsfc envelope and its relationship to the cycling induced bsfc curve.