Study of Two-Stage Injection in Optimizing Cold-Start Emission Characteristics of GDI Engine

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Study of Two-Stage Injection in Optimizing Cold-Start Emission Characteristics of GDI Engine

更新时间：2025-07-09

- Study of Two-Stage Injection in Optimizing Cold-Start Emission Characteristics of GDI Engine
- Vol. 46, Issue 1, Pages: 13-18(2012)
- 作者机构：
  
  天津大学内燃机燃烧学国家重点实验室,天津,300072
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK411
- Online First：10 January 2012，
  
  Published：2012
- 稿件说明：
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Study of Two-Stage Injection in Optimizing Cold-Start Emission Characteristics of GDI Engine[J]. 2012, 46(1): 13-18.
DOI：

Study of Two-Stage Injection in Optimizing Cold-Start Emission Characteristics of GDI Engine[J]. 2012, 46(1): 13-18. DOI：

摘要

研究了一种通过特殊活塞顶面形状结合二次喷射策略来解决直喷汽油机冷启动工况排放问题的新方法.该方法通过适当的二次喷油分配、结合缸内气流运动来改善燃油混合气的分布.利用AVL-Fire对不同喷油策略下直喷汽油机启动时缸内油气混合分布进行了模拟

对不同喷油策略的冷启动排放进行了实验研究.结果表明

采用特殊活塞顶面形状进行合理的壁面引导

同时结合二次喷油策略

能够优化直喷汽油机冷启动工况下缸内空燃比的分布

使得混合气浓度在火花塞附近略高

宜于火花点火

在火花塞周围略低

宜于火焰传播

从而提高燃烧的稳定性

减少燃油的湿壁现象

降低HC的排放.

Abstract

A new solution to the cold start emissions of gasoline direct injection(GDI)engines was presented with two-stage injection strategy and special design of piston crown to improve the distribution of the air-fuel mixture and the combustion stability. AVL-Fire was used to simulate the distribution of fuel-air mixture in a cylinder under cold start condition. The cold-start-exhaust experiment with different injection strategies was conducted. The results show that the two-stage injection strategy combined with reasonably guiding the air flow would optimize the distribution of the fuel-air ratio in the cylinder under cold start condition

thus improving the characteristics of the spark ignition and the spread speed of the flame front

and mitigating fuel wetted-wall phenomenon. It seems that the present method may enhance the combustion stability and reduce the HC emissions.

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references

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ZHENG Xu, JIANG Yi. Modeling the cold start of the ford 3.5 L V6 EcoBoost engine, SAE 2009-01-1493 [R]. Warrendale, PA, USA: SAE, 2009.

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史鉴明,李国祥.汽油机缸内直喷技术的研究与发展[J].山东机械, 2005, 24(3): 6-8.

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程勇,王建昕,吴宁,等.降低汽油机启动及暖机过程中HC排放的探讨[J].内燃机学报,2002,20(4):292-296.

CHENG Yong, WANG Jianxin, WU Ning, et al. Investigation on reducing HC emissions during cold-start and warm-up periods of gasoline engine [J]. Transactions of CSAICE, 2002, 20(4): 292-296.

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