Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (1): 31-40.doi: 10.13229/j.cnki.jdxbgxb20210523

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Effect of EGR and ignition on performance of spark⁃assisted compression ignition engine fueled with gasoline

You ZHOU1(),Wei HONG1,Fang-xi XIE1(),Yan SU1,Yu LIU1,Xiao-ping LI1,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 Co. ，Ltd. ，Changchun 130022，China
  • Received:2021-06-06 Online:2023-01-01 Published:2023-07-23
  • Contact: Fang-xi XIE E-mail:13339550222@163.com;xfx2011@jlu.edu.cn

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Abstract:

Based on a modified gasoline engine， this paper studied the effects of EGR rate and ignition timing on spark assisted homogeneous compression ignition （SACI） combustion and emission performance， and analyzed the relationship between the spark ignition/compression ignition（SI/CI） switching timing and combustion parameters. The results show that external exhaust gas recirculation （EGR） can effectively reduce pressure rise rate， and suppress knocking， it also plays a role in improving fuel economy and NO x emissions. By adjusting the ignition timing to fit CA50 and SI/CI switching timing within the range of 9~10°CA ATDC and 2°CA ATDC respectively， the engine can obtain the best torque and BSFC.

Key words: gasoline engine, spark assisted homogeneous compression ignition, exhaust gas recirculation, spark ignition/ compression ignition switching timing, emissions performance

CLC Number: 

  • TK411

Table 1

Engine specification"

参 数描述
缸径×冲程/（mm×mm）80×80
压缩比17∶1
燃料95#E10乙醇汽油
冷却方式水冷
润滑方式压力与飞溅

Fig.1

Schematic view of experiment setup"

Fig.2

Layout of piston cutting"

Fig.3

Definition of SI/CI switching timing"

Fig.4

Performance comparison of SACI and SI combustion modes"

Fig.5

Influence of ignition timing and EGR rate on cylinder pressure and heat release of SACI combustion"

Fig.6

Influence of ignition timing and EGR rate on heat release rate of SACI combustion"

Fig.7

Influence of ignition timing and EGR rate on pressure rising rate of SACI combustion"

Fig.8

Influence of ignition timing and EGR rate on flame development of SACI combustion"

Fig.9

Influence of ignition timing and EGR rate on combustion duration of SACI combustion"

Fig.10

Influence of ignition timing and EGR rate on CA50 of SACI combustion"

Fig.11

Influence of ignition timing and EGR rate on SI/CI switching timing"

Fig.12

Relationship between CA50 and SI/CI switching timing"

Fig.13

Relationship between SI/CI switching timing and IMEP"

Fig.14

Relationship between SI/CI switching timing and torque"

Fig.15

Influence of ignition timing and EGR rate CO emission"

Fig.16

Influence of ignition timing and EGR rate THC emission"

Fig.17

Influence of ignition timing and EGR rate CO emission"

Fig.18

Influence of ignition timing and EGR rate CO emission"

Fig.19

Influence of ignition timing and EGR rate CO emission"

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