Experimental Study for Effect of Multi-Site Spark Ignition on Dedicated Hybrid Engine Performance under High Dilution Condition

  • YAN Bowen ,
  • WATERS Benjamin ,
  • HAINES Andrew ,
  • MCGHEE Mike ,
  • HU Tiegang ,
  • DENG Wei ,
  • PU Yongxian ,
  • MA Tianyu
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  • 1. Powertrain Engineering R&D Center, Chongqing Changan Automobile Co., Ltd., Chongqing 400000, China
    2. Changan UK R&D Centre Limited, Birmingham B377YG, United Kingdom

网络出版日期: 2025-01-09

基金资助

The authors would like to acknowledge the financial support provided by Chongqing Technical Innovation and Application Development Project (cstc2020jscx-dxwtBX0024) and China Internal Combustion Engine Society Youth Talent Promotion Program.

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024

Experimental Study for Effect of Multi-Site Spark Ignition on Dedicated Hybrid Engine Performance under High Dilution Condition

  • YAN Bowen ,
  • WATERS Benjamin ,
  • HAINES Andrew ,
  • MCGHEE Mike ,
  • HU Tiegang ,
  • DENG Wei ,
  • PU Yongxian ,
  • MA Tianyu
Expand
  • 1. Powertrain Engineering R&D Center, Chongqing Changan Automobile Co., Ltd., Chongqing 400000, China
    2. Changan UK R&D Centre Limited, Birmingham B377YG, United Kingdom

Online published: 2025-01-09

Supported by

The authors would like to acknowledge the financial support provided by Chongqing Technical Innovation and Application Development Project (cstc2020jscx-dxwtBX0024) and China Internal Combustion Engine Society Youth Talent Promotion Program.

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024

摘要

本研究首次在一台三缸1.5L混动专用发动机上进行了三火花点火方案的设计,并在此基础上研究了不同点火模式对高稀释工况下发动机燃烧和排放特性的影响。在2000 rpm 8 bar BMEP工况下的测试结果表明:基于缸内高滚流强度设计,仅采用被动预燃室所能实现的稀燃极限相比单火花塞更低,由此使得最低油耗和NOx排放略有增加。在被动预燃室基础上增加侧置火花塞可相比单火花塞提高稀燃极限拓展能力和发动机性能,然而其改善程度低于三火花塞方案。随着lambda增加,被动预燃室或被动预燃室加侧置火花塞对于燃烧相位的改善效果逐渐减弱,而滞燃期和燃烧持续期明显增加。相同lambda条件下,侧置火花塞可缩短滞燃期,但对燃烧持续期改善并不明显。在极稀混合气条件下,被动预燃室及被动预燃室加侧置火花塞在燃烧特性方面的优势已不再明显,但采用三火花塞点火可同时有效缩短滞燃期和燃烧持续期。三火花塞稀燃拓展能力最强,因此原始NOx排放最低,且由于末端混合气燃烧更加充分,CO和HC排放也明显降低。基于三火花塞的优异性能,针对发动机最高热效率进行了进一步探究,结果表明采用RON92燃油时,发动机最终在当量燃烧加EGR和稀燃模式下分别实现了43.69%和45.02%的有效热效率。采用RON100燃油时,采用稀燃模式最高有效热效率可进一步提升至45.63%。

本文引用格式

YAN Bowen , WATERS Benjamin , HAINES Andrew , MCGHEE Mike , HU Tiegang , DENG Wei , PU Yongxian , MA Tianyu . Experimental Study for Effect of Multi-Site Spark Ignition on Dedicated Hybrid Engine Performance under High Dilution Condition[J]. 热科学学报, 2025 , 34(1) : 254 -267 . DOI: 10.1007/s11630-024-2012-2

Abstract

In this study, a triple spark ignition scheme was first designed on a three-cylinder 1.5-L dedicated hybrid engine (DHE). On this basis, the effect of different ignition modes on engine combustion and emission characteristics was studied, especially under high dilution condition. The results tested at 2000 r/min and 0.8 MPa BMEP (brake mean effective pressure) show that with highly increased in-cylinder flow intensity, using only passive prechamber (PPC) has a lower lean limit than that with single central spark plug (CSP), thereby leading to slightly higher minimum fuel consumption and nitrogen oxides (NOx) emissions. Adding side spark plugs (SSP) based on PPC can result in improved capability of lean limit extension and engine performance than CSP. However, the improvement level is lower than that with triple spark plugs (TSP). As the excess air ratio λ increases, the advantage of PPC and PPC with SSP in improving the combustion phasing compared with CSP gradually weakens. Correspondingly, the increasing tendency of their ignition delay and combustion duration is more obvious. The added SSP based on PPC can effectively shorten the ignition delay of leaner mixture, but the combustion duration can be only slightly improved. As a result, under extremely lean condition, the advantage of PPC and PPC with SSP in terms of combustion characteristics over CSP becomes much smaller. In contrast, the TSP ignition can achieve much shorter ignition delay and combustion duration simultaneously under this condition. Due to the highest available dilution level, the TSP ignition achieves the lowest raw NOx emissions. Moreover, it can also reduce the raw carbon monoxide (CO) and hydrocarbons (HC) emissions compared to CSP due to a more thorough combustion of the end gas mixture. Based on the excellent performance of TSP, the highest engine brake thermal efficiency (BTE) was further explored. The results show that with normal RON 92 fuel, the engine finally achieved 43.69% and 45.02% BTE under stochiometric mode with exhaust gas recirculation (EGR) and lean-burn mode respectively. When using RON 100 fuel, the highest BTE was further increased to 45.63% under lean-burn mode.

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