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| Optimization of Gasoline Compression Ignition Engine Performance at High Loads with Advanced Injection Strategy and Atkinson Cycle |
| DOI：10.13949/j.cnki.nrjgc.2020.04.007 |
| Key Words:gasoline compression ignition multiple injections Atkinson cycle injection time injection pressure |
| Author Name | Affiliation | | HAN Yiyong,HUA Jianxiong,WANG Limin,GAO Qiang,ZHOU Lei,WEI Haiqiao | 1.State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
2.Guangxi Yuchai Machinery Group Co. Ltd., Yulin 537005, China |
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| Abstract:Based on a single cylinder engine, the effects of injection parameter, multiple injection and the Atkinson cycle on the performance of gasoline compression injection(GCI) engine at high loads were studied. The results show that with the single injection strategy, the injection pressure, injection timing and injection mass have significant effects on GCI combustion. Increasing injection pressure can increase the indicated mean effective pressure(IMEP) of the engine and reduce cycle-to-cycle variation, but too high injection pressure causes the combustion to be extremely sensitive to the change of the injection timing, which makes it difficult to organize normal combustion. The increase of fuel injection can increase IMEP, but excessive fuel injection mass will lead to the increase of incomplete combustion and the decrease of thermal efficiency. With the split injection strategy, the main injection timing plays a decisive role in combustion. Advancing the main injection timing improves the engine performance and increases the pressure rise rate simultaneously. And as the main injection timing is delayed, the engine performance is deteriorated, and the cycle-to-cycle variation becomes great. Increasing pilot injection ratio is beneficial to the improvement of engine performance, but excessive pilot injection ratio leads to less combustion controllability. The Atkinson cycle can obviously improve the thermal efficiency of GCI engine. The main reason is that it reduces negative work during the compression stroke, while maintaining positive work during the expansion stroke. |
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