气门重叠角对GDI发动机性能和微粒排放的影响

doi:10.19562/j.chinasae.qcgc.2023.04.014

Abstract

Abstract:

In this paper， the influence of valve overlap angle formed by variable intake timing （IVT）， variable exhaust timing （EVT） and variable intake and exhaust timing strategy （IEVT） on combustion and particulate emission of the direct injection gasoline engine is studied. It is found that the increase of positive valve overlap angle under the three timing strategies under low load will lead to the increase of residual exhaust gas in the cylinder，prolonged ignition delay and increased combustion duration， and reduce fuel consumption and HC emissions at first and then increase， and reduce NO _x emission. At the same valve overlap angle， EVT has the largest amount of residual exhaust gas， while IVT can improve the pumping loss by 15.6%. Compared with IVT and EVT， IEVT still burns stably at the overlapping angle of 60 ° CA and reduces heat transfer loss and exhaust loss， with reduction offuel consumption by 8.67%， reduction of NO _x by 96.57%， and reduction of the total number of particles by 89.43%.

Key words: valve overlap angle, valve timing, direct injection gasoline engine, engine performance, particulate emission

Xiaona Li,Fangxi Xie,Huili Dou,Jiangwei Liu,Yu Liu. Influence of Valve Overlap Angle on GDI Engine Performance and Particulate Emission[J].Automotive Engineering, 2023, 45(4): 654-662.

Figures/Tables 14

References 22

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参数	类型
发动机	4缸4冲程4气门
进气方式	废气涡轮增压
发动机排量/L	1.39
缸径×冲程/mm	76.5 × 75.6
压缩比	10
最大转矩/（N·m）	220
额定功率/kW	100

转速/（r·min^-1）	负荷/%	策略	排气关闭推迟角度/（°）CA	进气开启提前角度/（°）CA
1 500	13.6	EVT	0，10，20，30，40，50	0
1 500	13.6	IVT	0	0，10，20，30，40，50，60
1 500	13.6	IEVT	20	0，10，20，30，40，
1 500	13.6	IEVT	30	0，10，20，30，40
1 500	13.6	IEVT	40	0，10，20，30，40

[1]	Fangxi Xie,Xianglong Meng,Yu Liu,Xiaona Li,Yulin Zhang,Haizhou Feng. EVCT on Combustion and Particulate Emission of Direct Injection Gasoline Engine [J]. Automotive Engineering, 2022, 44(5): 701-708.
[2]	Tang Ziqiang, Yang Jincai, Liu Gang, Liu Bin, Li Jian & Zhang Liang. A Study on the Knocking Noise of Valve Timing System in a Turbocharged Engine During Cold Start [J]. , 2018, 40(9): 1110-1117.

Influence of Valve Overlap Angle on GDI Engine Performance and Particulate Emission

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