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Potentials of Air-EGR Dilution for Improving Performance of a High Compression Ratio Spark-Ignition Engine Fueled with Methanol

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Abstract

The effects of air and exhaust gas recirculation (EGR) dilution of a spark ignition engine fueled with methanol under different loads were studied by experiment in this paper. Such as ignition delay, combustion center (CA50), IMEP, break thermal efficiency (BTE) and other parameters were investigated to assess the combustion performance. And discussed in depth the balance between NOx emissions and economic performance represented by brake specific fuel consumption (BSFC). The results showed that combustion progress such as ignition delay, combustion duration and CA50 were more sensitive on the changes of EGR, introducing EGR under the same dilution rate prolonged combustion process. Air-EGR dilution showed the best improvement of IMEP and break thermal efficiency, except the optimal area, increasing EGR rate will decreased IMEP and BTE. Air-EGR dilution strategy showed the best improvement on BSFC than air dilution than EGR dilution. Under light load and high load, when the lowest BSFC was obtained, NOx emissions were less than 0.5 g/kWh with air-EGR dilution strategy.

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Abbreviations

BSFC:

brake specific fuel consumption

BTE:

break thermal efficiency

CA10:

crank angle position between ignition timing to 10 % heat release

CA50:

crank angle position between ignition timing to 50 % heat release

CA10-90:

crank angle duration between 90 % and 10 % heat release

COVIMEP :

variation coefficient of IMEP

EGR:

exhaust gas recirculation

GDI:

gasoline direct injection

IMEP:

indicated mean effective pressure

PRR:

pressure rise rate

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Acknowledgement

This work was financially supported by National Natural Science Foundation of China (Grant No. 51876079), funded by the special fund for basic scientific research in central colleges and universities, funded by State Key Laboratory of Automotive Simulation and Control (ascl-zytsxm-202014), Science and Technology Research Project of Education Department of Jilin Province (JJKH20221002KJ), Key project of Social Development Science and Technology Department of Science and Technology Department of Jilin Province (20220203156SF).

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Authors and Affiliations

  1. State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun, 130025, China

    Kaichang Lai & Fangxi Xie

  2. GAC Automotive Research & Development Center, 668 East Jinshan Avenue, Guangzhou, 511434, China

    Kaichang Lai, Hong Chen, Jiakun Du, Wenfeng Zhan & Yuhuai Li

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  1. Kaichang Lai
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  2. Hong Chen
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  3. Jiakun Du
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Correspondence to Jiakun Du.

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Lai, K., Chen, H., Du, J. et al. Potentials of Air-EGR Dilution for Improving Performance of a High Compression Ratio Spark-Ignition Engine Fueled with Methanol. Int.J Automot. Technol. 24, 1061–1073 (2023). https://doi.org/10.1007/s12239-023-0087-5

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