A Strategy to Improve the Efficiency of Stoichiometric Spark Ignition Engines 961953
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.
Citation: 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. Download Citation
Author(s):
S. Diana, V. Giglio, B. Iorio, G. Police
Affiliated:
Insituto Motori - C.N.R.
Pages: 13
Event:
1996 SAE International Fall Fuels and Lubricants Meeting and Exhibition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Outcome of the European Programme on Emissions, Fuels and Engine Technologies (Epefe)-SP-1204, Emissions Formation and In-Cylinder Control of Emissions in SI Engines-SP-1268
Related Topics:
Spark ignition engines
Exhaust gas recirculation (EGR)
Nitrogen oxides
Carbon monoxide
Fuel economy
Brake torque
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