Effect of fuel injection on low-speed pre-ignition in SI engine

被引：0
|
作者：
Rao X.-K. [1 ]
Wei H.-Q. [1 ]
Feng D.-Q. [1 ]
Pan M.-Z. [1 ]
Pei Z.-G. [1 ]
机构：
[1] State Key Laboratory of Engines, Tianjin University, Tianjin
来源：
Pan, Ming-Zhang (panmingzhang@tju.edu.cn) | 2016年 / Chinese Society for Internal Combustion Engines卷 / 34期
关键词：
Boosted spark ignition engine; Fuel injection pressure; Low-speed pre-ignition; Start of fuel injection;
D O I：
10.16236/j.cnki.nrjxb.201601004
中图分类号：
学科分类号：
摘要：
Combustion characteristics, oscillation frequencies and oscillation intensities of low-speed pre-ignition (LSPI) compared with normal combustion were experimentally investigated in a boosted direct injection SI engine. Meanwhile, both the start of fuel injection and injection pressure variations were considered to find out their impacts on LSPI, including frequency and intensity. Experiment results show that LSPI can induce both ordinary knock and super knock because of different advance angle of auto-ignition. Super knock may take place with supersonic shock wave or detonation wave. As start of fuel injection is postponed, the frequency of LSPI shows the tendency of firstly increases and then decreases. Compared to start of injection at 300°, CA BTDC, the frequencies of LSPI and super knock at 240°, CA BTDC reduce 96.0%, and 88.2%, respectively. The intensity of super knock also decreases greatly. Increasing injection pressure from 6 MPa to 12 MPa will increase the frequency of LSPI. Further increasing the injection pressure, the frequency and intensity of LSPI and super knock will decrease. Different injection timings and pressure variations can induce different oil dilution and particle emission, which are considered to be the reasons inducing the LSPI. © 2016, Chinese Society for Internal Combustion Engines. All right reserved.
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页码：25 / 31
页数：6
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