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Title: The Reduced Effectiveness of EGR to Mitigate Knock at High Loads in Boosted SI Engines

Abstract

Numerous studies have demonstrated that exhaust gas recirculation (EGR) can attenuate knock propensity in spark ignition (SI) engines at naturally aspirated or lightly boosted conditions. In this paper, we investigate the role of cooled EGR under higher load conditions with multiple fuel compositions, where highly retarded combustion phasing typical of modern SI engines was used. It was found that under these conditions, EGR attenuation of knock is greatly reduced, where EGR doesn’t allow significant combustion phasing advance as it does under lighter load conditions. Detailed combustion analysis shows that when EGR is added, the polytropic coefficient increases causing the compressive pressure and temperature to increase. At sufficiently highly boosted conditions, the increase in polytropic coefficient and additional trapped mass from EGR can sufficiently reduce fuel ignition delay to overcome knock attenuation effects. Kinetic modeling demonstrates that the effectiveness of EGR to mitigate knock is highly dependent on the pressure-temperature condition. Experiments at 2000 rpm have confirmed reduced fuel ignition delay under highly boosted conditions relevant to modern downsized boosted SI engines, where in-cylinder pressure is higher and the temperature is cooler. Finally, at these conditions, charge reactivity increases compared to naturally aspirated conditions, and attenuation of knock by EGR ismore » reduced.« less

Authors:
 [1];  [2]; ORCiD logo [1];  [2];  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Bioenergy Technologies Office (EE-3B); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
OSTI Identifier:
1376439
Grant/Contract Number:
AC05-00OR22725; AC52-07NA27344
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
SAE International Journal of Engines
Additional Journal Information:
Journal Volume: 10; Journal Issue: 5; Journal ID: ISSN 1946-3936
Publisher:
SAE International
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; exhaust gas recirculation (EGR); knock; turbochargers; spark ignition engines

Citation Formats

Szybist, James P., Wagnon, Scott W., Splitter, Derek A., Pitz, William J., and Mehl, Marco. The Reduced Effectiveness of EGR to Mitigate Knock at High Loads in Boosted SI Engines. United States: N. p., 2017. Web. doi:10.4271/2017-24-0061.
Szybist, James P., Wagnon, Scott W., Splitter, Derek A., Pitz, William J., & Mehl, Marco. The Reduced Effectiveness of EGR to Mitigate Knock at High Loads in Boosted SI Engines. United States. doi:10.4271/2017-24-0061.
Szybist, James P., Wagnon, Scott W., Splitter, Derek A., Pitz, William J., and Mehl, Marco. 2017. "The Reduced Effectiveness of EGR to Mitigate Knock at High Loads in Boosted SI Engines". United States. doi:10.4271/2017-24-0061.
@article{osti_1376439,
title = {The Reduced Effectiveness of EGR to Mitigate Knock at High Loads in Boosted SI Engines},
author = {Szybist, James P. and Wagnon, Scott W. and Splitter, Derek A. and Pitz, William J. and Mehl, Marco},
abstractNote = {Numerous studies have demonstrated that exhaust gas recirculation (EGR) can attenuate knock propensity in spark ignition (SI) engines at naturally aspirated or lightly boosted conditions. In this paper, we investigate the role of cooled EGR under higher load conditions with multiple fuel compositions, where highly retarded combustion phasing typical of modern SI engines was used. It was found that under these conditions, EGR attenuation of knock is greatly reduced, where EGR doesn’t allow significant combustion phasing advance as it does under lighter load conditions. Detailed combustion analysis shows that when EGR is added, the polytropic coefficient increases causing the compressive pressure and temperature to increase. At sufficiently highly boosted conditions, the increase in polytropic coefficient and additional trapped mass from EGR can sufficiently reduce fuel ignition delay to overcome knock attenuation effects. Kinetic modeling demonstrates that the effectiveness of EGR to mitigate knock is highly dependent on the pressure-temperature condition. Experiments at 2000 rpm have confirmed reduced fuel ignition delay under highly boosted conditions relevant to modern downsized boosted SI engines, where in-cylinder pressure is higher and the temperature is cooler. Finally, at these conditions, charge reactivity increases compared to naturally aspirated conditions, and attenuation of knock by EGR is reduced.},
doi = {10.4271/2017-24-0061},
journal = {SAE International Journal of Engines},
number = 5,
volume = 10,
place = {United States},
year = 2017,
month = 9
}

Journal Article:
Free Publicly Available Full Text
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