Ethanol Detection in Flex-Fuel Direct Injection Engines Using In-Cylinder Pressure Measurements
Date Published: 2009-04-20
Paper Number:2009-01-0657
DOI: 10.4271/2009-01-0657
Citation:
Oliverio, N., Stefanopoulou, A., Jiang, L., and Yilmaz, H., "Ethanol Detection in Flex-Fuel Direct Injection Engines Using In-Cylinder Pressure Measurements," SAE Int. J. Fuels Lubr. 2(1):229-241, 2009, doi:10.4271/2009-01-0657.
A method for detection of ethanol content in fuel for an engine equipped with direct injection (DI) is presented. The methodology is based on in-cylinder pressure measurements during the compression stroke and exploits the different charge cooling properties of ethanol and gasoline. The concept was validated using dynamometer data of a 2.0L DI turbocharged engine with variable valve timing (VVT). An algorithm was developed to process the experimental data and generate a residue from the complex cycle-to-cycle in-cylinder pressure evolution which captures the charge cooling effect. The experimental results show that there is a monotonic correlation between the residues and the fuel ethanol percentage in the majority of the cases. However, the correlation varies for different engine operating parameters; such as, speed, load, valve timing, fuel rail pressure, intake and exhaust temperature and pressure.
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