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| Experimental Investigation of Effect of Injection Pressure on Medium- and High-Load Performance of Gasoline Compression Ignition |
| DOI：10.13949/j.cnki.nrjgc.2020.03.008 |
| Key Words:gasoline compression ignition (GCI) injection pressure knock |
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| Abstract:An experiment of how fuel injection pressure affects the performances of gasoline compression ignition(GCI) was conducted, including the characteristics of combustion, engine knock, thermal efficiency and emissions. It was conducted on a modified single-cylinder engine with the compression ratio of 17. The results show that with the increase in the injection pressure, the air-fuel mixture forms much more quickly, the auto-ignition timing advances towards the top dead center, and the combustion duration becomes shorter. All of those lead to a higher thermal efficiency at first and a slightly lower one later. However, high injection pressure will lead to multipoint auto-ignition, causing higher maximum pressure rise rate and severe engine knock, which requires a delayed injection timing. The combustion becomes more sensitive to injection timing as the injection pressure rises, and the higher variation in coefficient of cyclic indicates mean effective pressure or knock is more likely to appear, resulting in more difficulty in combustion control. Through data analysis, no significant effects of the injection pressure on knocking frequency is found. Besides, increased injection pressure will reduce HC and CO emissions, but result in a certain increase in NOx emissions. |
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