Reducing exhaust emissions from an automotive DI diesel engine by means of air injection variable swirl inlet system

Proceedings of the IEEE International Vehicle Electronics Conference (IVEC'99) (Cat. No.99EX257) Pub Date : 1999-09-06 DOI:10.1109/IVEC.1999.830642

Zhong-chang Liu, Xunjun Liu, Zhaohe Zhang

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引用次数: 4

Abstract

An air injection variable swirl inlet system (AIVSIS) by means of injecting air into helical intake passage for a diesel engine was developed. Steady flow rig test results showed that AIVSIS is able to increase or decrease the swirl strength in the cylinder at suitable injector position by different air injection directions. Position and air injection directions of injector, as well as nozzle hole diameter and air injection pressure were determined. Diesel engine test results showed that AIVSIS hardly affects volumetric efficiency in the cylinder. At lighter load operating conditions of 1500 rpm, the performance and the trade-off between NO/sub x/ and particulate emission (PT), brake specific fuel consumption (BSFC) are all improved using AIVSIS to reduce swirl strength without obvious increase of CO emission, but THC emission increases a little. At heavier load operating conditions, the performance and PT, THC and CO emissions are all improved using AIVSIS to increase swirl level, but at the same time, NO/sub x/ emission increases a little.

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利用空气喷射可变涡流进气系统减少汽车直喷柴油机的废气排放

研制了一种柴油机螺旋进气通道进气的空气喷射变涡流进气系统。定常流台试验结果表明，AIVSIS可以通过不同的喷气方向，在适当的喷油嘴位置增加或减少气缸内的旋流强度。确定了喷油器的位置和喷气方向，以及喷嘴孔径和喷气压力。柴油机试验结果表明，AIVSIS对缸内容积效率几乎没有影响。在1500转/分的轻负荷工况下，采用AIVSIS降低旋流强度后，发动机性能及NO/sub /与颗粒排放(PT)、制动比油耗(BSFC)之间的权衡均得到改善，CO排放没有明显增加，但THC排放略有增加。在较重负荷工况下，采用AIVSIS提高旋流水平，性能和PT、THC、CO排放量均有所改善，但NO/sub x/排放量略有增加。

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Proceedings of the IEEE International Vehicle Electronics Conference (IVEC'99) (Cat. No.99EX257)

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