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Title: Effects of Ignition and Injection Perturbation under Lean and Dilute GDI Engine Operation

Abstract

Turbocharged gasoline direct injection (GDI) engines are quickly becoming more prominent in light-duty automotive applications because of their potential improvements in efficiency and fuel economy. While EGR dilute and lean operation serve as potential pathways to further improve efficiencies and emissions in GDI engines, they also pose challenges for stable engine operation. Tests were performed on a single-cylinder research engine that is representative of current automotive-style GDI engines. Baseline cases were performed under steady-state operating conditions where combustion phasing and dilution levels were varied to determine the effects on indicated efficiency and combustion stability. Sensitivity studies were then carried out by introducing binary low-high perturbation of spark timing and injection duration on a cycle-by-cycle basis under EGR dilute and lean operation to determine dominant feedback mechanisms. Ignition perturbation was phased early/late of MBT timing, and injection perturbation was set fuel rich/lean of the given air-to-fuel ratio. COVIMEP was used to define acceptable operation limits when comparing different perturbation cases. Overall sensitivity data shows COVIMEP is more sensitive to injection perturbation over ignition perturbation. This is because of the greater effect injection perturbation has on combustion phasing, ignition delay, and combustion duration.

Authors:
 [1];  [2];  [1];  [1];  [2]
  1. Argonne National Laboratory (ANL)
  2. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Fuels, Engines and Emissions Research Center (FEERC); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). National Transportation Research Center (NTRC)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1223071
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: JSAE/SAE 2015 International Powertrains, Fuels & Lubricants Meeting, Kyoto, Japan, 20150901, 20150904
Country of Publication:
United States
Language:
English

Citation Formats

Wallner, Thomas, Kaul, Brian C, Sevik, James, Scarcelli, Riccardo, and Wagner, Robert M. Effects of Ignition and Injection Perturbation under Lean and Dilute GDI Engine Operation. United States: N. p., 2015. Web.
Wallner, Thomas, Kaul, Brian C, Sevik, James, Scarcelli, Riccardo, & Wagner, Robert M. Effects of Ignition and Injection Perturbation under Lean and Dilute GDI Engine Operation. United States.
Wallner, Thomas, Kaul, Brian C, Sevik, James, Scarcelli, Riccardo, and Wagner, Robert M. 2015. "Effects of Ignition and Injection Perturbation under Lean and Dilute GDI Engine Operation". United States.
@article{osti_1223071,
title = {Effects of Ignition and Injection Perturbation under Lean and Dilute GDI Engine Operation},
author = {Wallner, Thomas and Kaul, Brian C and Sevik, James and Scarcelli, Riccardo and Wagner, Robert M},
abstractNote = {Turbocharged gasoline direct injection (GDI) engines are quickly becoming more prominent in light-duty automotive applications because of their potential improvements in efficiency and fuel economy. While EGR dilute and lean operation serve as potential pathways to further improve efficiencies and emissions in GDI engines, they also pose challenges for stable engine operation. Tests were performed on a single-cylinder research engine that is representative of current automotive-style GDI engines. Baseline cases were performed under steady-state operating conditions where combustion phasing and dilution levels were varied to determine the effects on indicated efficiency and combustion stability. Sensitivity studies were then carried out by introducing binary low-high perturbation of spark timing and injection duration on a cycle-by-cycle basis under EGR dilute and lean operation to determine dominant feedback mechanisms. Ignition perturbation was phased early/late of MBT timing, and injection perturbation was set fuel rich/lean of the given air-to-fuel ratio. COVIMEP was used to define acceptable operation limits when comparing different perturbation cases. Overall sensitivity data shows COVIMEP is more sensitive to injection perturbation over ignition perturbation. This is because of the greater effect injection perturbation has on combustion phasing, ignition delay, and combustion duration.},
doi = {},
url = {https://www.osti.gov/biblio/1223071}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 2015},
month = {Thu Jan 01 00:00:00 EST 2015}
}

Conference:
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