Influences of spark discharge characteristics on ignition and combustion process in lean-burn SI engine

Seima Tsuboi, Shinji Miyokawa, Masayoshi Matsuda, Takeshi Yokomori, Norimasa Iida

Research output: Contribution to conferencePaper

Abstract

Lean-burn SI engines have been investigated to decrease the heat loss, such as the cooling loss and the pumping loss. However, as excess air ratio approaches the lean operation limit, the cycle-to-cycle variation (CCV) of SI combustion becomes an obstacle to stable operation. This study reports the effects of spark discharge characteristics, such as discharge current and spark-shortening phenomena, on the CCV of SI combustion under lean operation (excess air ratio = 1.8 - 2.3). An enhanced ignition system equipped with 20 ignition coils was utilized in this study. In the experiment, the discharge interval between each coil unit was modified to change the discharge current and duration. The results showed that the CCV of combustion was suppressed with the discharge interval, and the lean operation limit was extended to = 2.1. Observations of in-cylinder photographs suggest that the repetition of spark-shortening phenomena promoted the flame kernel formation.

Original languageEnglish
Publication statusPublished - 2019 Jan 1
Event12th Asia-Pacific Conference on Combustion, ASPACC 2019 - Fukuoka, Japan
Duration: 2019 Jul 12019 Jul 5

Conference

Conference12th Asia-Pacific Conference on Combustion, ASPACC 2019
CountryJapan
CityFukuoka
Period19/7/119/7/5

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ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Energy Engineering and Power Technology
  • Fuel Technology
  • Condensed Matter Physics

Cite this

Tsuboi, S., Miyokawa, S., Matsuda, M., Yokomori, T., & Iida, N. (2019). Influences of spark discharge characteristics on ignition and combustion process in lean-burn SI engine. Paper presented at 12th Asia-Pacific Conference on Combustion, ASPACC 2019, Fukuoka, Japan.