Modeling the Effect of Engine Assembly Mass on Engine Friction and Vehicle Fuel Economy
Date Published: 1995-02-01
Paper Number:950988
DOI: 10.4271/950988
Citation:
An, F. and Stodolsky, F., "Modeling the Effect of Engine Assembly Mass on Engine Friction and Vehicle Fuel Economy," SAE Technical Paper 950988, 1995, doi:10.4271/950988.
Author(s):
Feng An - University of California
Frank Stodolsky - University of California
Abstract:
In this paper, an analytical model is developed to estimate the impact of reducing engine assembly mass (the term engine assembly refers to the moving components of the engine system, including crankshafts, valve train, pistons, and connecting rods) on engine friction and vehicle fuel economy. The relative changes in frictional mean effective pressure and fuel economy are proportional to the relative change in assembly mass. These changes increase rapidly as engine speed increases. Based on the model, a 25% reduction in engine assembly mass results in a 2% fuel economy improvement for a typical mid-size passenger car over the EPA Urban and Highway Driving Cycles.
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