基于离子电流与缸压信息融合的HCCI发动机不完全燃烧提前诊断*

doi:10.19562/j.chinasae.qcgc.2020.10.007

Abstract

Abstract: Due to the random abnormal combustion, the application of HCCI engine is hindered. In this paper, based on the platform of a 2.0 L four-cylinder engine with modified compression ratio and valve mechanism, taking the cylinder pressure and ion current in the period of negative valve overlap as signals, the method of advanced diagnosis of incomplete combustion in HCCI engine is studied. The results show that the peak phase of cylinder pressure and the peak value of ion current during NVO can be used as the basis for incomplete combustion diagnosis. When the peak phase of cylinder pressure or the peak value of ion current is used alone for diagnosis, most of the incomplete combustion cycles can be judged in advance, with the diagnostic sensitivity of 93.8% and 95.6% respectively; but some of the normal cycles can be misjudged as incomplete combustion cycles. When using the combination of cylinder pressure and ion current signal for diagnosis, the diagnostic accuracy can be greatly improved to 90.0%, and the diagnostic sensitivity can be kept at 91.4%

Key words: HCCI, advanced diagnosis, information fusion, cylinder pressure, ion current

Wang Shuo, Zhu Denghao, Deng Jun, Li Liguang. Advanced Diagnosis of Incomplete Combustion in HCCI Engine Based on Information Fusion of Ion Current and Cylinder Pressure[J].Automotive Engineering, 2020, 42(10): 1340-1345.

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Advanced Diagnosis of Incomplete Combustion in HCCI Engine Based on Information Fusion of Ion Current and Cylinder Pressure

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