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| Effects of Pre-chamber Jet Flame Ignition on Performance of a GasolineDirect Injection Engine |
| DOI：10.13949/j.cnki.nrjgc.2021.03.009 |
| Key Words:pre-chamber jet flame ignition gasoline performance gasoline emission |
| Author Name | Affiliation | E-mail | | Chen Hong* | GAC Automotive Research Development Center,Guangzhou,511434 | chenhong@gacrnd.com | | Li Yu-huai | GAC Automotive Research Development Center,Guangzhou,511434 | | | Luo Heng-bo | GAC Automotive Research Development Center,Guangzhou,511434 | luohengbo@gacrnd.com | | Du Jia-kun | GAC Automotive Research Development Center,Guangzhou,511434 | | | Jiang Xiao-xiao | GAC Automotive Research Development Center,Guangzhou,511434 | | | Wang Lei | GAC Automotive Research Development Center,Guangzhou,511434 | |
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| Abstract:Based on a gasoline direct injection, exhaust gas turbocharged and downsized high efficient engine, comparing tests of low end torque, combustion and economic, emission performances at middle speed have been done when the conventional spark plug ignition and the pre-chamber system were assembled into the engine respectively. The effects of pre-chamber ignition and spark ignition on the engine performances differences were explored and analyzed. The results indicate that at 1500r.min-1、BMEP 2Mpa operation point, combustion constant volume efficiency is enhanced with peak fire pressure increasing, and combustion phase is advanced by 7.1°CA, resulting in brake specific fuel consumption(BSFC) improved by 24g/kWh. When the engine operates at 2000r.min-1 loads, pre-chamber can improve combustion cycle of variation(CoV) and shorten burning duration, also the combustion phase is advanced remarkably at big load, getting fuel benefit of 7g.kWh-1 with bake thermal efficiency increasing from 36.9% to 37.5%, while BSFC floats up a little bit at light load. When turning to gas emissions, NOx increases by 15% when pre-chamber system is used, and HC decreases by 36%, while CO emission keeps relatively stable, only decreasing a little bit at big load. |
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