TY - CONF
T1 - Influences of spark discharge characteristics on ignition and combustion process in lean-burn SI engine
AU - Tsuboi, Seima
AU - Miyokawa, Shinji
AU - Matsuda, Masayoshi
AU - Yokomori, Takeshi
AU - Iida, Norimasa
N1 - Funding Information:
This work was supported by the Council for Science, Technology, and Innovation (CSTI); by the Cross-Ministerial Strategic Innovation Promotion Program (SIP); and by ?Innovative Combustion Technology? (Funding agency: Japan Science and Technology Agency). The authors are grateful to Koyama Garage Co., Ltd., Mr. Hidetsugu Yamamoto, and Mr. Hiroyuki Komatsu for providing technical support.
Funding Information:
This work was supported by the Council for Science, Technology, and Innovation (CSTI); by the Cross-Ministerial Strategic Innovation Promotion Program (SIP); and by “Innovative Combustion Technology” (Funding agency: Japan Science and Technology Agency). The authors are grateful to Koyama Garage Co., Ltd., Mr. Hidetsugu Yamamoto, and Mr. Hiroyuki Komatsu for providing technical support.
Publisher Copyright:
© Asia-Pacific Conference on Combustion, ASPACC 2019.All right reserved.
PY - 2019
Y1 - 2019
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85083952077&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85083952077&partnerID=8YFLogxK
M3 - Paper
AN - SCOPUS:85083952077
T2 - 12th Asia-Pacific Conference on Combustion, ASPACC 2019
Y2 - 1 July 2019 through 5 July 2019
ER -