Journal of Jilin University(Engineering and Technology Edition) ›› 2025, Vol. 55 ›› Issue (9): 2817-2827.doi: 10.13229/j.cnki.jdxbgxb.20240483

   

Transient emission optimization of diesel engines based on segmented fuel injection timing delay strategy

Yao-hong XING1,2(),Jing TIAN1,2(),Hao-yu JIA1,2,Yong-qiang HAN1,2,Hua-yu JIN3,Chen HONG3   

  1. 1.State Key Laboratory of Automotive Simulation and Control，Jilin University，Changchun 130022，China
    2.College of Automotive Engineering，Jilin University，Changchun 130022，China
    3.R&D Center of China FAW Co. ，Ltd. ，Changchun 130022，China
  • Received:2024-05-06 Online:2025-09-01 Published:2025-11-14
  • Contact: Jing TIAN E-mail:yhxing23@mails.jlu.edu.cn;jingtian@jlu.edu.cn

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Abstract:

To address the deterioration of emissions during transient conditions in automotive diesel engines， the CA6DM3 National Ⅵ high-pressure common rail diesel engine was investigated. A transient measurement and control platform was constructed based on “dSPACE”， and a transient emission optimization strategy utilizing segmented fuel injection timing delay was proposed. A typical transient operating condition was selected with a speed of 1 100 r/min， a load range of 10% to 90%， and a loading time of 3 seconds. Reference air-fuel ratios slightly lower than the stable loading period， specifically 27 and 28， were chosen. A segmented fuel injection timing control strategies implemented through two methods—difference delay and proportional delay， were proposed to achieve segmented delay in fuel injection timing. The test results indicate that， while balancing the dynamic performance and fuel economy during the transient loading process of the diesel engine， adopting the difference delay segmented strategy with a reference air-fuel ratio of 28，the 6 °CA delay scheme yielded the optimal emission improvement effect. The maximum reductions in NO x and particulate matter emissions during the transient loading process were 6.5% and 27.77%， respectively， the cumulative emission reductions were 6.8% and 31.9%.

Key words: automotive diesel engine, transient emissions, injection timing strategy, dSPACE measure and control platform

CLC Number: 

  • TK427

Table 1

Technical parameters of diesel engine"

参数值参数值
型号CA6DM3标定功率/kW410
气门数/个4标定转速/（r·min-1）1 800
总排量/L12.5缸径×行程/（mm×mm）126.5×166
排放标准国Ⅵ进气系统增压中冷
燃烧室缩口ω型怠速转速/（r·min-1）600
气缸布置形式直列燃油供给系统Bosch高压共轨系统
压缩比17.6

Fig.1

Measurement and control bench structure"

Fig.2

Cyclic fuel injection quantity varies with time during transient processes"

Fig.3

Real-time calculated values of air-fuel ratio during transient loading in the original engine's fuel injection timing"

Fig.4

Experimental design flowchart for segmented fuel injection timing delay strategy"

Table 2

Experimental plans for varying fuel injection timing delay"

分段方式喷油正时延后方案
差值分段-2 °CA（AFR_28）
-4 °CA（AFR_28）
-6 °CA（AFR_28）
-2 °CA（AFR_27）
-4 °CA（AFR_27）
-6 °CA（AFR_27）
比例分段gain_-0.6（AFR_28）
gain_-0.8（AFR_28）
gain_-1（AFR_28）
gain_-0.6（AFR_27）
gain_-0.8（AFR_27）
gain_-1（AFR_27）

Fig.5

Influence of different fuel injection timing on combustion parameters during the transient loading process"

Fig.6

Influence of different fuel injection timing on the response of performance parameters during transient loading process"

Fig.7

Ratlo of trasient loading process performance parameter under different fuel injection timings to the maximal difference of the original engine"

Fig.8

Comparison of cumulative emission values during transient loading process"

Fig.9

Injection advance angle corresponding to difference delay strategies in fuel injection timing"

Fig.10

Transient loading process combustion parameters under the difference delay strategies"

Fig.11

Transient loading process performance parameters under the difference delay strategies"

Fig.12

Injection advance angle corresponding to proportional delay strategies in fuel injection timing"

Fig.13

Transient loading process combustion parameters under the proportional delay strategies"

Fig.14

Transient loading process performance parameters under the proportional delay strategies"

Fig.15

Cumulative emission values in major time intervals with differences in the transient process"

[1] 滕玥. 《中国移动源环境管理年报(2023年)》发布 监管污染源,守护“中国蓝”[J]. 环境经济, 2023(23): 34-37.
Teng Yue. "China Mobile Source Environmental Management Annual Report (2023)" released to monitor pollution sources and protect "China Blue"[J]. Environmental Economy, 2023(23): 34-37.
[2] .重型柴油车污染物排放限值及测量方法(中国第六阶段) [S].
[3] Ahire V, Shewale M, Razban A. A review of the state-of-the-art emission control strategies in modern diesel engines[J]. Archives of Computational Methods in Engineering, 2021,28:4897-4915.
[4] Rakopoulos C D, Giakoumis E G. Diesel engine transient operation: Principles of operation and simulation analysis[M]. 1rd ed. London:Springer-Verlag London,2009:134-159.
[5] Rakopoulos C D, Dimaratos A M, Giakoumis E G, et al. Exhaust emissions estimation during transient turbocharged diesel engine operation using a two-zone combustion model[J]. International Journal of Vehicle Design, 2009, 49(1/2/3): 125-149.
[6] Rakopoulos C D, Dimaratos A M, Giakoumis E G, et al. Experimental assessment of turbocharged diesel engine transient emissions during acceleration, load change and starting[R]. Wavnendale,P A: SAE Inrernational, 2010.
[7] Atac O F, Moon S, Huang W, et al. Hole number effect on internal and discharged flow characteristics of diesel injector during transient operation[J]. Flow Measurement and Instrumentation, 2022, 88: No.102252.
[8] Atac O F, Lee S, Moon S. Development of simplified model for injection rate prediction of diesel injectors during transient and steady operation[J]. Fuel, 2022, 324: No.124655.
[9] Feng R, Sun Z, Li G, et al. The impact of thermal status on emissions of a non-road diesel engine equipped with after-treatment system under transient operation[J]. Case Studies in Thermal Engineering, 2022, 36: No.102244.
[10] Liu Z C, Yu K B, Tian J, et al. Influence of rail pressure on a two-stage turbocharged heavy-duty diesel engine under transient operation[J]. International Journal of Automotive Technology, 2017, 18(1): 19-29.
[11] 万明定. 高原环境下车用柴油机性能及瞬态特性研究 [D]. 昆明:昆明理工大学交通工程学院,2023.
Wan Ming-ding. The research of automotive diesel engine performance and transient characteristics in the plateau environment[D]. Kunming: College of Transportation Engineering,Kunming University of Science and Technoloy, 2023.
[1] SUN Wan-chen, LIU Xun-jun, LIU Zhong-chang, CHENG Peng, LI Jun. Investigation on Combustion Processes of Automotive Diesel Engine with Different Charging Systems [J]. 吉林大学学报(工学版), 2000, (3): 1-4.
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