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| Effects of Intake Pressure and Intake Temperature on Spark Assisted Gasoline Compression Ignition at Low Load |
| DOI：10.13949/j.cnki.nrjgc.2022.04.002 |
| Key Words:spark assisted gasoline compression ignition（SAGCI） low load intake pressure intake temperature combustion stability |
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| Abstract:The effects of intake pressure and intake temperature on spark assisted gasoline compression ignition under low load were studied on a single-cylinder testing machine transformed from a six-cylinder heavy-duty diesel engine. The results illustrate that reasonable intervals between fuel injection and ignition timing must be maintained at each intake pressure to achieve stable combustion. While the intake pressure is increased， the fuel injection timing area becomes narrower and the ignition timing area expands. The increase of intake pressure reduces the flame propagation speed and mitigates maximum pressure rise rate， and the proportion of auto-ignition heat release has increased significantly. The indicated thermal efficiency increases with the increase of intake pressure. The maximum indicated thermal efficiency has been increased from 41.8% under natural aspiration condition to 44.4% with the cyclic fuel mass of 35 mg at 140 kPa intake pressure. Properly increasing intake temperature can enhance the thermal atmosphere in the cylinder， significantly improve the combustion stability while the maximum indicated thermal efficiency is the same， and expand the fuel injection timing area for stable combustion. Also， higher intake temperature accelerates the flame propagation speed， but the earlier ignition timing may cause too high pressure rise rate. |
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