NDLI: Model Based Air-fuel Ratio Control for Pfi Si Engines Fueled with Ethanol-gasoline Blends

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Model Based Air-fuel Ratio Control for Pfi Si Engines Fueled with Ethanol-gasoline Blends

Content Provider	Semantic Scholar
Author	Wu, Feng Lin Yao, Dongwei Ling, Xinchen
Copyright Year	2015
Abstract	The ethanol-gasoline blends have brought new challenges to the in-cylinder mixture air-fuel ratio control for the variable fuel characteristics especially in the traditional PFI (Port Fuel Injection) SI (Spark Ignition) engines. This paper has studied every dynamic links in the intake fuel transfer process from fuel injectors to cylinders, including the wall-wetting effect and injector fuel flow characteristics. And then a wall-wetting fuel film evaporation model and an injector fuel flow model are constructed, forming the new intake port fuel dynamic model. All of these models have considered the impact of ethanol component in blend fuels. On this basis, a model based air-fuel ratio control strategy for PFI SI engines fueled with ethanol-gasoline blends is proposed. The strategy combines the traditional fuel feedforward and feedback corrections, and introduces a linear oxygen sensor based blend fuels’ mixing ratio self-learning algorithm, achieving the fuel adaptive compensation for the intake wall-wetting effect and injector fuel flow characteristics. The test results show that, the model based air-fuel ratio control strategy can always adjust the in-cylinder mixture air-fuel ratio near the stoichiometric one. The maximum relative control deviation of air-fuel ratio under steady conditions has not exceeded ±2%, while for transient conditions, the control deviation is still less than ±4%, much better than traditional map based control strategy. And moreover the control strategy has a good adaptability to different ethanolgasoline blends.
Starting Page	2929
Ending Page	2937
Page Count	9
File Format	PDF HTM / HTML
DOI	10.30638/eemj.2015.311
Volume Number	14
Alternate Webpage(s)	http://www.eemj.icpm.tuiasi.ro/pdfs/vol14/no12/20_337_Yao_12.pdf
Alternate Webpage(s)	http://omicron.ch.tuiasi.ro/EEMJ/pdfs/accepted/431_337_Yao_12.pdf
Alternate Webpage(s)	https://doi.org/10.30638/eemj.2015.311
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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