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《工程(英文)》 >> 2019年 第5卷 第3期 doi: 10.1016/j.eng.2018.12.010

汽油压燃发动机低负荷燃烧稳定性和冷机着火性能的试验研究

a State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China

b Yuchai Machinery Co., Ltd., Yulin 537005, China

# These authors contributed equally to this work and should be considered as equal co-authors.

收稿日期: 2018-05-15 修回日期: 2018-09-10 录用日期: 2018-12-25 发布日期: 2019-03-28

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摘要

汽油压燃(GCI)是一种极具发展前景的低排放、高效率燃烧技术。然而,低负荷燃烧稳定性和冷启动是GCI燃烧面临的两大挑战。为了解决这些问题,研究人员提出了负气门重叠角(NVO)、喷油策略优化、燃油重整和进气预热等策略,然而,冷启动难题却仍然有待解决。本文的目标正是研究实现GCI发动机冷启动的切实可行的方法。本研究结合了NVO、缸内燃油重整和进气预热,以实现在冷机和冷边界条件下GCI发动机的着火和随后的热机工况。结果表明,喷油开始时刻(SOI)在进气冲程时具有最佳的燃油经济性;SOI在压缩冲程期间可有效拓展发动机小负荷极限;SOI在NVO期间则可实现发动机在冷进气和冷却液未预热条件下的稳定燃烧。考虑到NVO喷油策略具有未燃混合气活性强、缸内热积累速度快的特点,该策略非常适合用于实现GCI的冷机着火。在冷启动过程中,实现GCI发动机的着火还需要一些辅助措施,如进气加热,以启动第一个着火循环。通过NVO策略、缸内燃油重整和进气预热的组合,本文实现了GCI发动机在5个燃烧循环内的成功着火。启动过程结束后,发动机无需再采用进气预热即可实现稳定运行。

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