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A Strategy to Improve the Efficiency of Stoichiometric Spark Ignition Engines
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Abstract
A commercial four stroke spark ignition engine has been tested at steady conditions, with three different compression ratios, namely: 10, 11.5 and 13. Exhaust Gas Recycle (EGR) has been varied in the range 0% - 20 %. Air/fuel ratio has been maintained at stoichiometric by a closed loop control with Exhaust Gas Oxygen sensor feedback.
Significant gains on fuel economy and CO emission index have been achieved at medium and high loads by the simultaneous adoption of EGR and high compression ratios. In these conditions the sum of HC and NOx emission indices attains significant reductions at any load.
The tests have shown that EGR allows to avoid knock even at wide open throttle and Maximum Brake Torque timing.
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Diana, S., Giglio, V., Iorio, B., and Police, G., "A Strategy to Improve the Efficiency of Stoichiometric Spark Ignition Engines," SAE Technical Paper 961953, 1996, https://doi.org/10.4271/961953.Also In
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Number: SP-1268; Published: 1996-10-01
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Number: SP-1204; Published: 1996-10-01
Number: SP-1204; Published: 1996-10-01
References
- KURODA, H. et al “The Fast Burn with Heavy EGR, New Approach for Low NOx and Improved Fuel Economy” SAE Paper 780006
- NEAME, G.R. et al. “Improving the Fuel Economy of Stoichiometrically Fuelled S.I. Engines by Means of EGR and Enhanced Ignition. A Comparison of Gasoline, Methanol and Natural Gas” SAE Paper 952376
- MICHIHIKO, T. “Improving NOx and Fuel Economy for Mixture Injected SI Engine with EGR” SAE Paper 950684
- HEYWOOD, J.B. “Internal Combustion Engine Fundamentals” McGraw Hill New York, USA 1988 0-07-100499-8
- GUIBET, J.C. “Carburants et Moteurs” Technip 1 1987
- DE PETRIS, C. et al. “High Efficiency Stoichiometric Spark Ignition Engines” SAE Paper 941933