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Fuel type detection in a diesel engine. A study of the cycle-to-cycle pressure variations inside the fuel rail. Comparison between Biodiesel and Petro-diesel.

Kedar Jaltare
Göteborg : Chalmers tekniska högskola, 2012. Diploma work - Department of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden, ISSN 1652-8557; 2011:64, 2012.
[Examensarbete på avancerad nivå]

The behaviour of Petrodiesel and Biodiesel (FAME) within the high pressure fuel rail of a common rail compression ignition engine is studied and compared. The aim of this study is to determine if there are any differences between the behaviours of the two fuels which can be used to distinguish between them, for example in a real-time fuel-type detection algorithm in a flex-fuel engine. Tests were conducted at 20 steady-state operating points in an engine test rig with three different fuels: 100% FAME biodiesel, B7 and B50 (blends of 7 and 50% biodiesel respectively). The pressure inside the fuel rail was recorded enginesynchronously and analysed. The pressure data shows some minor differences across fuels in their rates of pressure rise and fall as the fuels is compressed to the target injection pressure and then injected. The rates of pressure rise and fall for fuels with higher bio-content were found to be higher than for Petrodiesel. While this property could be made use of in a fuel type detection algorithm, two considerations need to be made: First, the noise in the pressure sensor signal in use should be lower than the expected difference in pressure across fuel blends. Second, these (small) differences were observed under controlled conditions in a test cell; they may not be evident under normal running conditions.

Nyckelord: Biodiesel, FAME, Rail pressure, fuel type detection, flex fuel



Publikationen registrerades 2012-01-27. Den ändrades senast 2013-04-04

CPL ID: 154452

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