Influence of Different Injection Strategies on the Performance of Methanol Lean-Burn Direct-Injection Engines

XU Yangfan; LEI Jun; DUAN Hao; WANG Xibin; YIN Xiaojun; HU Erjiang; ZENG Ke

doi:10.7652/xjtuxb202504005

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Influence of Different Injection Strategies on the Performance of Methanol Lean-Burn Direct-Injection Engines

更新时间：2026-01-06

- Influence of Different Injection Strategies on the Performance of Methanol Lean-Burn Direct-Injection Engines
- Journal of Xi’an Jiaotong University Vol. 59, Issue 4, Pages: 50-59(2025)
- 作者机构：
  
  1.西安交通大学能源与动力工程学院， 710049，西安
  2.洛阳拖拉机研究所有限公司， 471039，河南洛阳
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202504005
  CLC： TK431
- Received：22 November 2024，
  
  Online First：31 December 2024，
  
  Published：10 April 2025
- 稿件说明：
移动端阅览
XU Yangfan, LEI Jun, DUAN Hao, et al. Influence of Different Injection Strategies on the Performance of Methanol Lean-Burn Direct-Injection Engines[J]. Journal of Xi’an Jiaotong University, 2025, 59(4): 50-59.
DOI：

XU Yangfan, LEI Jun, DUAN Hao, et al. Influence of Different Injection Strategies on the Performance of Methanol Lean-Burn Direct-Injection Engines[J]. Journal of Xi’an Jiaotong University, 2025, 59(4): 50-59. DOI： 10.7652/xjtuxb202504005.

摘要

为了深入研究单缸直喷式火花点火稀薄燃烧甲醇发动机多因素耦合作用下的性能，探究了多次喷射策略对甲醇发动机性能的影响。研究选取了3种喷射策略的3个试验组共22个工况，探究了不同喷射次数、喷射时刻和各次喷射燃料的占比对其动力性、经济性和排放性能的影响。研究结果表明：与单次喷射相比，多次喷射可有效优化甲醇发动机缸内燃烧过程，使最大缸内压力及其对应的曲轴转角分布更集中，显著减少劣化循环数量，减少数量最多达85%，显著降低循环变动，最多达65%；与单次喷射相比，多次喷射会导致CO、HC排放量上升，但喷射和点火参数的系统优化可以降低NO

排放量；本试验条件下，3次喷射时刻分别为上止点前270°、180°和90°，3次喷射比例分别为0.38、0.42和0.20时，发动机可获得最佳的综合

性能。发动机在3次喷射策略下综合性能整体高于1次喷射和2次喷射，3次喷射策略在优化发动机综合性能方面拥有更高的潜力。

Abstract

For a single-cylinder direct-injection spark-ignition lean-burn methanol engine

the influence of multiple injection strategies on engine performance is investigated. Three experimental groups with three different injection strategies are selected for a total of 22 operating conditions to explore the impact of varying injection frequencies

timing

and fuel proportions on the engine's power

economy

and emissions performance. The research results show that compared to single injection

multiple injections can effectively optimize the in-cylinder combustion process of methanol engines

concentrating the maximum in-cylinder pressure and its corresponding crank angle distribution

significantly reducing the number of degradation cycles by up to 85% and cycle-to-cycle variations by up to 65%. While multiple injections may lead to increased CO and HC emissions compared to single injection

systematic optimization of injection and ignition parameters can reduce NO

emissions. Under the conditions of this study

the optimal performance is achieved with injection timings of 270°

180°

and 90° before top dead center for the three injections

with fuel proportions of 0.38

0.42

and 0.20

respectively. The engine achieves the best comprehensive performance with these settings. Overall

the engine's comprehensive performance under the three injection strategy surpasses that of one or two injections

indicating that the three-injection strategy has higher potential for optimizing the engine's comprehensive performance.

关键词

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references

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