DIRECT INJECTION STRATEGY TO EXTEND THE LEAN LIMIT OF A PASSIVE PRE-CHAMBER

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations

Abstract

Lean operation increases the efficiency of the Otto-cycle internal combustion engine and decreases its emissions. However, increasing the air-fuel ratio beyond stoichiometry requires higher ignition energy to maintain the stable operation of the engine. The pre-chamber emerges as one of the promising enablers of lean operation, providing much larger energy into the main combustion chamber than simple a spark plug at multiple sites to increase combustion stability. Pre-chambers are classified into two categories based on their fuel input; active pre-chambers, with a dedicated fuel injection system, and passive pre-chambers, which are solely charged with the main chamber air-fuel mixture through nozzle holes. Therefore, the passive pre-chamber type is favorable for existing engines because of its compact design and limited modification requirements. Nevertheless, passive pre-chambers have issues with igniting very lean mixtures. In this study, a single-cylinder light-duty engine is used to study the possibility of extending the lean limit of the passive pre-chamber using a split direct injection (DI) strategy and indirect enrichment of the prechamber mixture. The results of the split injection method were then compared to port fuel injection (PFI) measurements. Also, another set of experiments was performed with a standard spark plug using PFI and split DI for comparison. The results showed an increase in the lean limit of passive pre-chamber operation when using the split DI strategy compared to PFI, from λ=1.5 to 1.7. However, increased soot production was observed when using the split injection strategy.

Original languageEnglish (US)
Title of host publicationProceedings of ASME 2022 ICE Forward Conference, ICEF 2022
PublisherAmerican Society of Mechanical Engineers
ISBN (Electronic)9780791886540
DOIs
StatePublished - 2022
EventASME 2022 ICE Forward Conference, ICEF 2022 - Indianapolis, United States
Duration: Oct 16 2022Oct 19 2022

Publication series

NameProceedings of ASME 2022 ICE Forward Conference, ICEF 2022

Conference

ConferenceASME 2022 ICE Forward Conference, ICEF 2022
Country/TerritoryUnited States
CityIndianapolis
Period10/16/2210/19/22

Bibliographical note

Publisher Copyright:
Copyright © 2022 by ASME.

Keywords

  • Indirectly fueled
  • Lean combustion
  • Passive
  • Pre-chamber
  • Stratified charge

ASJC Scopus subject areas

  • Automotive Engineering
  • Mechanical Engineering

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