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汽车安全与节能学报

汽车安全与节能学报 ›› 2026, Vol. 17 ›› Issue (4): 467-475.DOI: 10.3969/j.issn.1674-8484.2026.04.005

• 汽车节能与环保 • 上一篇    下一篇

喷射控制参数对甲醇柴油双直喷内燃机性能的影响

柳东威1(), 张显越1, 于迅2, 刘浩业1,*(), 孙凯1, 王天友1   

  1. 1 天津大学， 先进内燃动力全国重点实验室， 天津 300350， 中国
    2 交通运输部天津水运工程科学研究所， 港口水工建筑技术国家工程研究中心，水路交通环境保护技术交通行业重点实验室， 天津 300456， 中国
  • 收稿日期:2026-03-31 修回日期:2026-05-15 出版日期:2026-08-30 发布日期:2026-09-01
  • 通讯作者: *刘浩业，教授。E-mail：liuhaoye@tju.edu.cn。
  • 作者简介:柳东威（1985—），男（汉），河北，正高级工程师。E-mail：liudongwei@catarc.ac.cn。
  • 基金资助:
    教育部基础学科和交叉学科突破计划项目(JYB2025XDXM305);国家自然科学基金青年科学基金项目(62305140);天津市自然科学基金面上项目(23JCYBJC00460)

Effects of injection control parameters on the performance of methanol-diesel dual direct injection internal combustion engines

LIU Dongwei1(), ZHANG Xianyue1, YU Xun2, LIU Haoye1,*(), SUN Kai1, WANG Tianyou1   

  1. 1 School of Mechanical Engineering, Tianjin University, Tianjin 300350, China
    2 Key Laboratory of Environmental Protection Technology on Water Transport, Ministry of Transport, National Engineering Research Center of Port Hydraulic Construction Technology, Tianjin Research Institute for Water Transport Engineering, M.O.T., Tianjin 300456, China
  • Received:2026-03-31 Revised:2026-05-15 Online:2026-08-30 Published:2026-09-01

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摘要：

为系统揭示宽负荷范围内喷射控制参数对甲醇柴油双直喷内燃机燃烧与排放的影响规律，该文在甲醇替代率超过90%的条件下，通过甲醇柴油双直喷单缸机试验系统研究了低、中、高3种负荷时甲醇的喷射压力和甲醇与柴油的喷射正时对燃烧与排放性能的影响。结果表明：甲醇喷射压力提高可加速甲醇放热，使指示热效率提升，但高负荷下过高的喷射压力会导致最大压力升高率超限，引发爆震；推迟甲醇喷射正时使CA50燃烧相位线性推迟，指示热效率大幅下降，但NOx排放降低；提前柴油喷射正时使甲醇放热率峰值先降后升，指示热效率和燃烧持续期呈先增后减趋势; 当柴油喷射正时略早于甲醇时，发动机在兼顾热效率与排放方面表现最佳。

关键词: 双直喷, 高甲醇替代率, 扩散燃烧, 热效率, 排放性能

Abstract:

To systematically reveal the effects of injection control parameters on the combustion and emission characteristics of a methanol-diesel dual direct injection internal combustion engine across a wide load range, this study carried out experiments on a methanol-diesel dual direct injection single-cylinder engine test system with a methanol substitution rate above 90%. The influences of methanol injection pressure, as well as methanol and diesel injection timings, on combustion and emission performance were investigated under low, medium and high load conditions. The results indicate that increasing methanol injection pressure accelerates methanol heat release and improves indicated thermal efficiency. Nevertheless, excessively high injection pressure under high load will drive the maximum pressure rise rate beyond the allowable limit and trigger engine knock. Retarding methanol injection timing linearly delays the CA50 combustion phasing, resulting in a substantial decline in indicated thermal efficiency but a reduction in NOx emissions. Advancing diesel injection timing causes the peak heat release rate of methanol to first decrease and then increase, while indicated thermal efficiency and combustion duration exhibit a trend of first rising and then falling. The engine delivers the optimal balanced performance between thermal efficiency and emissions when diesel injection timing is set slightly earlier than methanol injection timing.

Key words: duel direct injection, high methanol substitution rate, diffusion combustion, thermal efficiency, emission characteristics

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