NDLI: Steady-State biodiesel blend estimation via a wideband oxygen sensor

Content Provider	IEEE Xplore Digital Library
Author	Snyder, D.B. Washington, E.G. Indrajuana, A.P. Shaver, G.M.
Copyright Year	2008
Description	Author affiliation: Sch. of Mech. Eng., Purdue Univ., West Lafayette, IN (Snyder, D.B.)
Abstract	A substantial opportunity exists to reduce carbon dioxide $(CO_{2})$ emissions as well as dependence on foreign oil by developing strategies to cleanly and efficiently use biodiesel, a renewable, domestically available, alternative diesel fuel. However, biodiesel utilization presents several challenges, including decreased fuel energy density and increased emissions of smog-generating nitrogen oxides $(NO_{x}).$ These negative aspects can likely be mitigated via closed-loop combustion control provided the properties of the fuel blend can be estimated accurately, on-vehicle, in real-time. To this end, this paper presents a method to practically estimate the biodiesel content of fuel being used in a diesel engine during steady-state operation. The simple, generalizable, physically motivated estimation strategy presented utilizes information from a wideband oxygen sensor in the engine's exhaust stream, coupled with knowledge of the air-fuel ratio, to estimate the biodiesel content of the fuel. Experimental validation was performed on a 2007 Cummins 6.7 liter ISB series engine. Four fuel blends (0%, 20%, 50% and 100% biodiesel) were tested at a wide variety of torque-speed conditions. The estimation strategy correctly estimated the biodiesel content of the four fuel blends to within 4.2% of the true biodiesel content. Blends of 0%, 20%, 50% and 100% were estimated to be 2.5%, 17.1%, 54.2%, and 96.8% respectively. The results indicate that the estimation strategy presented is capable of accurately estimating the biodiesel content in a diesel engine during steady-state engine operation. This method offers a practical alternative to in-the-fuel type sensors, because wideband oxygen sensors are already in widespread production and are in place on some modern diesel vehicles today.
Starting Page	988
Ending Page	993
File Size	862582
Page Count	6
File Format	PDF
ISBN	9781424420780
ISSN	07431619
DOI	10.1109/ACC.2008.4586620
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-06-11
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	American Automatic Control Council(AACC)
Subject Keyword	Steady-state Biofuels Wideband Biosensors Fuels Diesel engines Carbon dioxide Petroleum Nitrogen Combustion fuel flexibility biodiesel diesel engines alternative fuels diesel fuel biofuels oxygenation estimation virtual sensing
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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