Effects of passive pre-chamber jet ignition on combustion and emission at gasoline engine. (December 2021)

• Record Type: Journal Article
• Authors: Duan, Wei; Huang, Zhaoming; Chen, Hong; Tang, Ping; Wang, Li; Chen, Weiguo
• Is Part Of: Advances in mechanical engineering. Volume 13:Number 12(2021)
• Publication Date: 2021-12
• Subjects: Pre-chamber -- jet ignition -- gasoline engine -- combustion -- emission; Mechanical engineering -- Periodicals; 621.05
• DOI: 10.1177/16878140211067148
• Languages: English
• ISSNs: 1687-8132

Abstract

Pre-chamber jet ignition is a promising way to improve fuel consumption of gasoline engine. A small volume passive pre-chamber was tested at a 1.5L turbocharged GDI engine. Combustion and emission characteristics of passive pre-chamber at low-speed WOT and part load were studied. Besides, the combustion stability of the passive pre-chamber at idle operation has also been studied. The results show that at 1500 r/min WOT, compared with the traditional spark ignition, the combustion phase of pre-chamber is advanced by 7.1°CA, the effective fuel consumption is reduced by 24 g/kW h, and the maximum pressure rise rate is increased by 0.09 MPa/°CA. The knock tendency can be relieved by pre-chamber ignition. At part load of 2000 r/min, pre-chamber ignition can enhance the combustion process and improve the combustion stability. The fuel consumption of pre-chamber ignition increases slightly at low load, but decreases significantly at high load. Compared with the traditional spark ignition, the NOx emissions of pre-chamber increase significantly, with a maximum increase of about 15%; the HC emissions decrease, and the highest decrease is about 36%. But there is no significant difference in CO emissions between pre-chamber ignition and spark plug ignition. The intake valve opening timing has a significant influence on the pre-chamber combustion stability at idle operation. With the delay of the pre-chamber intake valve opening timing, the CoV is reduced and can be kept within the CoV limit.