Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (9): 2483-2492.doi: 10.13229/j.cnki.jdxbgxb.20211236

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Effects of injection parameters and taguchi method on particulate emissions of diesel engine under transient conditions

Shuang FENG1,2(),Wei HONG1,2,Xiao-ping LI1,2(),Fang-xi XIE1,2   

  1. 1.National Key Laboratory of Automotive Chassis Integration and Bionics，Jilin University，Changchun 130022，China
    2.College of Automotive Engineering，Jilin University，Changchun 130022，China
  • Received:2021-11-18 Online:2023-09-01 Published:2023-10-09
  • Contact: Xiao-ping LI E-mail:452177412@qq.com;lixp2008@jlu.edu.cn

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Abstract:

To study the particulate emissions characteristics and optimization methods of the engine under transient conditions， takes a 2.8 L turbocharged diesel engine as the research object. Firstly， the effects of single factor injection parameters on the particulate emissions under transient loading conditions were studied. Then，Taguchi orthogonal experiment was designed to give the optimal control parameter combination with the number and quality of particles， and the influence weight of each control parameter was determined. The results show that during the transient loading process， the number and concentration of small-sized nuclear particles deteriorated significantly， and the mass concentration of large-sized accumulated particles deteriorated significantly； Appropriately advancing the injection timing， increasing the injection pressure and the introduction of post-injection can reduce particulate emissions； Meanwhile， the effect of control parameters on nuclear and accumulated particulates has a trade-off relationship， and the relatively large weight of particulate emissions is the effect of fuel injection timing， that is the factor of injection timing and post injection interval.

Key words: diesel engine, transient conditions, particle emission, injection parameters, collaborative optimization

CLC Number: 

  • TK421.5

Table 1

Detailed parameters of the test engine"

发动机参数技术规格
发动机形式压燃、直列、四缸、四冲程
排量/L2.771
缸径×行程/mm×mm95.4×104.9
压缩比17.2∶1
喷孔数/个6
最高供油压力/MPa170
每缸气门数4（进、排气各两个）

（最大扭矩/转速）/［（N·m）/

（r·min-1）］

240/（1400~2600）

（额定功率/转速）/［kW/

（r·min-1）］

80/3400
怠速转速/（r·min-1）800±30
排放标准国V

Fig.1

Schematic of the engine test bench"

Table 2

Transient conditions test plan"

因素

主喷时刻/

（℃A ATDC）

轨压/MPa后喷比例/%主后喷间隔/（℃A ATDC）

主喷

角度

原机、原机±3、原机±6原机无无
轨压原机原机、原机±20无无
主、后喷间隔原机原机105、10、15、20

后喷

比例

原机原机5、10、15、2010

Fig.2

Influence of main injection timing on the number concentration of particles with different sizes"

Fig.3

Influence of main spray timing on mass concentration of particles with different sizes"

Fig.4

Effect of injection pressure on the number concentration of particles with different sizes"

Fig.5

Effect of injection pressure on mass concentration of particles with different sizes"

Fig.6

Effect of post-injection on the total number concentration of particles"

Table 3

Control factors and their levels for Taguchi method"

因素水平1水平2水平3水平4水平5
主喷正时A/℃A原-6原-2原机原+2原+4
轨压B/MPa原-20原-10原机原+10原+20
主后喷间隔C/μs10001500175020002500
后喷比例D/%51012.51520

Fig.7

Signal-to-noise ratio response curve of particle number in different mode"

Fig.8

Signal-to-noise ratio response curve of particle mass in different mode"

Fig.9

Weight of the influence of each control parameter on the quantity and quality of particles"

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