Closed-loop control of HCCI combustion for DME using external EGR and rebreathed EGR to reduce pressure-rise rate with combustion-phasing retard

Dongwon Jung, Norimasa Iida

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

This study experimentally investigates the effects of the combustion phasing on the homogeneous charge compression ignition (HCCI) combustion, and implements a closed-loop control of HCCI combustion to reduce pressure-rise rate (PRR) with combustion-phasing retard. The experiments were conducted using dimethyl ether (DME) in a single-cylinder HCCI research engine equipped with an exhaust gas recirculation (EGR) loop for external EGR and a two-stage exhaust cam for rebreathed EGR. The results show that a maximum PRR (PRRmax) and a maximum in-cylinder charge temperature decreases with combustion-phasing retard. However, excessive combustion-phasing retard leads to unacceptable coefficient of variation (COV) of CA50 and IMEP with partial-burn and/or misfire cycles. To dampen increasing cycle-to-cycle variations around the limit of combustion-phasing retard, the closed-loop control of HCCI combustion was implemented using three feedback variables. Finally, stable stoichiometric HCCI operation could be achieved with extensive combustion-phasing retard while maintaining acceptable PRRmax with the higher level of IMEP.

Original languageEnglish
Pages (from-to)315-330
Number of pages16
JournalApplied Energy
Volume138
DOIs
Publication statusPublished - 2015 Jan 5

Keywords

  • Closed-loop control
  • Combustion-phasing retard
  • Cycle-to-cycle variations
  • Dimethyl ether (DME)
  • Exhaust gas recirculation (EGR)
  • Homogeneous charge combustion ignition (HCCI)

ASJC Scopus subject areas

  • Building and Construction
  • Energy(all)
  • Mechanical Engineering
  • Management, Monitoring, Policy and Law

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