直喷增压汽油机扫气条件下喷油策略对超级爆震的影响

发布时间：2018-01-27 17:20

本文关键词： 内燃机缸内直喷扫气超级爆震两次喷射　出处：《内燃机工程》2016年06期 　论文类型：期刊论文

【摘要】：在缸内直喷汽油机上,将扫气和两次喷射相结合,研究在扫气条件下燃油策略对超级爆震抑制作用及对发动机经济性和排放性的影响。试验中制定了一种考虑发动机实际运行工况的超级爆震的试验测试程序。在不同喷油策略下发动机超级爆震工况点的试验结果表明:采用一次喷射策略,不同的燃油喷射角对性能影响很大,燃油喷射角过于提前,会产生油束与活塞顶面碰壁现象,推迟燃油喷射角可以降低碳烟排放。采用两次喷射相对一次喷射,碳烟排放可更进一步降低,输出转矩变化不大。两次喷射中二喷油起始角对超级爆震十分敏感。采用两次晚喷的分层模式会增大超级爆震频次,采用两次早喷的均质模式能减少超级爆震频次。
[Abstract]:In the cylinder direct injection gasoline engine, the scavenging and twice injection are combined. The effects of fuel strategy on super knock suppression and engine economy and emission under scavenging conditions were studied. A test procedure for super knock considering the actual operating conditions of the engine was developed. The experimental results of engine superknock working conditions under different injection strategies show that:. Using a one-shot injection strategy. Different fuel injection angles have a great impact on the performance. If the fuel injection angle is too early, it will produce the phenomenon that the fuel beam and the top surface of the piston will meet the wall phenomenon. Delaying the fuel injection angle can reduce the soot emission. Soot emission can be further reduced with little change in output torque. The starting angle of two injection is very sensitive to super knock. The frequency of super knock will be increased by adopting the stratified mode of two late injection. The frequency of super detonation can be reduced by using the homogenization model of two early sprays.
【作者单位】：清华大学汽车安全与节能国家重点实验室;奇瑞汽车股份有限公司发动机工程研究院;
【基金】：国家“八六三”高技术研究发展计划项目(2012AA111715)
【分类号】：TK411
【正文快照】： 2.奇瑞汽车股份有限公司发动机工程研究院,芜湖241009)0概述采用缸内直喷和涡轮增压技术,是目前国内外车用汽油机的主流发展方向[1]。通过缸内直喷和涡轮增压,可以实现发动机小型化,大幅提高汽油机的功率密度,而小型化发动机因质量轻、摩擦损失小,使节油效果较明显。随着小型

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