A Model for Predicting Residual Gas Fraction in Spark-Ignition Engines
Date Published: 1993-03-01
Paper Number:931025
DOI: 10.4271/931025
Citation:
Fox, J., Cheng, W., and Heywood, J., "A Model for Predicting Residual Gas Fraction in Spark-Ignition Engines," SAE Technical Paper 931025, 1993, doi:10.4271/931025.
Author(s):
Jonathan W. Fox - Massachusetts Institute of Technology
Wai K. Cheng - Massachusetts Institute of Technology
John B. Heywood - Massachusetts Institute of Technology
Abstract:
A model for calculating the residual gas fraction in spark ignition engines has been formulated. The model accounts explicitly for the contribution due to the back flow of exhaust gas to the cylinder during the valve overlap period. The model has been calibrated with in-cylinder hydrocarbon measurements at different values of intake pressure, engine speed, and valve overlap timings.
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