Optical diagnostics of charge stratification compression ignition in high compression ratio gasoline engine

doi:10.3969/j.issn.1674-8484.2021.03.017

Abstract

Abstract:

An optical diagnostic on charge stratification compression ignition was used to investigate the influences of gasoline direct injection (GDI) duration, timing and rail pressure to charge stratification compression ignition. Based on a single-cylinder optical engine with port injection method to inform pre-mixture and direct injection fuel to induce ignition, some experiments were developed under the conditions at different GDI duration of 0.5, 1.2, and 2 ms, with different timing at crank angles (before top dead center) of 40°, 50°, 60°, 80°, and 100°, and with different rail pressure of 3.8, 10, 15 MPa. The results show that charge stratification compression ignition is realized by adopting high compression ratio, normal valve timing, port injection to inform pre-mixture and direct injection fuel to induce ignition. Success chance of compression combustion is increased, combustion stability is improved, and the emission of soot is reduced by reasonable calibration to GDI duration, timing and rail pressure.

Key words: gasoline engine, charge stratification compression ignition, high compression ratio, optical diagnostics

CLC Number:

TK411

ZHANG Zhiyong, GAO Dingwei, LAI Haipeng, ZHANG Bin, XING Huafeng. Optical diagnostics of charge stratification compression ignition in high compression ratio gasoline engine[J]. Journal of Automotive Safety and Energy, 2021, 12(3): 410-416.

Figures/Tables 15

References 12

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缸径	79.5 mm
行程	100 mm
压缩比	14
排量	0.5 L
最高转速	3 500 r/min

缸径	79.5 mm
行程	100 mm
压缩比	14
排量	0.5 L
最高转速	3 500 r/min

转速	2 000 r/min
平均指示有效压力, IMEP	260 kPa
点火时刻,CA(btdc)	38°
PFI喷油时刻,CA(btdc)	320°
PFI喷射压力	550 kPa
过量空气因数	1.20
冷却水温度	60 ℃
机油温度	60 ℃

转速	2 000 r/min
平均指示有效压力, IMEP	260 kPa
点火时刻,CA(btdc)	38°
PFI喷油时刻,CA(btdc)	320°
PFI喷射压力	550 kPa
过量空气因数	1.20
冷却水温度	60 ℃
机油温度	60 ℃

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