Journal of Jilin University(Engineering and Technology Edition) ›› 2022, Vol. 52 ›› Issue (1): 37-45.doi: 10.13229/j.cnki.jdxbgxb20210928

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Effect of diesel injection timing and gasoline ratio on the emissions of homogeneous charge induced ignition

Yan SU1(),Bo WANG1,Yu LIU1(),Fang-xi XIE1,Yun-feng HU2,Jia-quan DUAN2   

  1. 1.State Key Laboratory of Automotive Simulation and Control，Jilin University，Changchun 130022，China
    2.State Key Laboratory of Comprehensive Technology on Automobile Vibration and Noise ＆ Safety Control，China FAW Group Corporation，Changchun 130011，China
  • Received:2021-10-08 Online:2022-01-01 Published:2022-01-14
  • Contact: Yu LIU E-mail:suyan@jlu.edu.cn;liuyu1981@jlu.edu.cn

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Abstract:

Based on the homogeneous charge induced ignition combustion mode， this paper studies the effects of gasoline ratios and diesel injection timing on combustion conventional gases and particulates emission. The engine speed is set to 1600 r/min， the total calorific value of the circulating fuel injection quantity is set to the total calorific value of the original engine under 50% working condition and the gasoline ratio is set to 65%， 70%， 75%. The injection time is fixed at -340°CA； gasoline injection pressure is fixed at 0.35 MPa， diesel main injection time is -10° CA， -5° CA and 0° CA， diesel pre-injection amount is 30% of total diesel injection amount， The results show that under the optimal strategy in this test， the torque is increased by 5%， the specific NOx emission is reduced by 60% to 0.31 g/（kW·h）， the concentration of nuclear particles is reduced by 80%， and the concentration of accumulated particles is reduced by 97%， The research results of this paper show the great potential of homogeneous mixture pilot mode in reducing particulates and NOx.

Key words: homogeneous charge induced ignition, injection parameters, particle emissions

CLC Number: 

  • TK421.5

Table 1

Parameters of 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2.771 L
缸径×行程95.4 mm×104.9 mm
压缩比17.2∶1
喷孔数6个
最高供油压力170 MPa
每缸气门数4（进、排气各2个）
最大扭矩/转速240 N?m/ 1400~2600 r?min-1
额定功率/转速80 kW/3400 r?min-1
怠速转速800±30 r?min-1
排放标准国V

Table 2

Physical and chemical properties of gasoline and diesel"

特 性汽 油柴 油
液体密度/（kg?m-3）750860
20℃动力黏度/（Pa?s）3.440
自燃温度/K509482
辛烷值（RON）9520
十六烷值1252
化学计量空燃比14.814.3
低热值/（kJ?kg-1）43 96042 500
沸点/K455482

Fig.1

Schematic diagram of engine test bench"

Table 3

Detailed parameters of the test bench"

项目仪器型 号生产厂家
电涡流测功机CW160凯迈机电
空气流量计SENSYCON三盟科技
汽油油耗仪DF?2420同圆测试
柴油油耗仪TOCEIL?CMFG025同圆测试
缸压传感器Kistler5018Kistler
角标仪365C01AVL
排放分析仪MEXA?7100DEGRHORIBA
冷却恒温装置SLW4001/0000申力测控
Lambda仪ES631.1ETAS
燃烧分析仪6260AVL

Fig.2

Cylinder pressure and HRR for 65% PRF，70% PRF， and 75% PRF"

Fig.3

Effect of diesel injection timing on temperature"

Fig.4

Effect of diesel injection timing on ignition delay and combustion duration"

Fig.5

Effect of diesel injection timing on coefficient of variation and peak pressure rise rate"

Fig.6

Effect of diesel injection timing on indicated thermal efficiency"

Fig.7

Effect of diesel injection timing on NOx，CO and THC emission"

Fig.8

Particle number-concentration distributions"

Fig.9

Particle concentration distributions"

Fig.10

Proportion of nuclei mode and accumulation mode"

Fig.11

Effect of diesel injection timing on BSFC and torque"

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[1] LIU Zhong-chang, SUN Shi-jie, TIAN Jing, XU Rui-chen, WANG Bo-zhou. Influences of fuel injection parameters on emissions and combustion of diesel engine under transient conditions [J]. 吉林大学学报(工学版), 2014, 44(6): 1639-1646.
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