Ethanol Detection in Flex-Fuel Direct Injection Engines Using In-Cylinder Pressure Measurements 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.
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, https://doi.org/10.4271/2009-01-0657. Download Citation
Nestor Oliverio, Anna Stefanopoulou, Li Jiang, Hakan Yilmaz
University of Michigan, Robert Bosch LLC
SAE World Congress & Exhibition
Combustion and Flow Diagnostics and Fundamental Advances in Thermal and Fluid Sciences, 2009-SP-2238, SAE International Journal of Fuels and Lubricants-V118-4, SAE International Journal of Fuels and Lubricants-V118-4EJ