Effects of Injection Control Parameters on Spray and Combustion&nbsp;of GDI Engine with CentrallyMounted Injector

DU Jiakun; CHEN Hong; LI Yuhuai; YE Lin; ZHANG Shuang

doi:10.3969/j.issn.10012222.2018.02.003

Vehicle Engine ›› 2018, Vol. 0 ›› Issue (2) : 17-22. DOI: 10.3969/j.issn.10012222.2018.02.003

Effects of Injection Control Parameters on Spray and Combustion of GDI Engine with CentrallyMounted Injector

DU Jiakun,CHEN Hong,LI Yuhuai,YE Lin,ZHANG Shuang

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Abstract

The effects of injection control parameters such as injection timing and injection pressure on combustion and spray characteristics of GDI optical engine with a centrallymounted injector were investigated. The results indicate that the combustion duration and ignition delay first decrease and then increase with the advance of third stage injection timing θ_SOI3. The combustion parameters both show an obvious inflection and the cycle variation coefficient of indicated mean effective pressure becomes small at 120°BTDC. The short distance between piston and top dead center in compression process led by the too late injection of third stage fuel will easily cause fuel beam to impact the piston surface. Increasing the injection pressure may shorten the combustion duration and improve the degree of constant volume combustion. However, the too large injection pressure will prolong the fuel penetration, the tendency of fuel beam to impact cylinder wall becomes more obvious, and hence the ignition delay and combustion duration extend.

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GDI engine / optical engine / spray characteristic / combustion characteristic

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DU Jiakun,CHEN Hong,LI Yuhuai,YE Lin,ZHANG Shuang. Effects of Injection Control Parameters on Spray and Combustion of GDI Engine with CentrallyMounted Injector[J]. Vehicle Engine. 2018, 0(2): 17-22 https://doi.org/10.3969/j.issn.10012222.2018.02.003