Volumetric Efficiency and Air-Fuel Ratio Analysis For Flex Fuel Engines 2008-36-0223
Stringent vehicle emissions limits, fuel economy and driveability requirements demand an accurate air-fuel ratio management system. A flex fuel (ethanol capable) engine system without an ethanol sensor requires a precisely tuned air fuel ratio control system. In flex fuel systems without an ethanol sensor, the ethanol content is estimated based on the closed loop adaptation values, therefore; it is important to have a very good open loop estimate of cylinder trapped air and consumed fuel since an error in either of these values will cause a shift in the closed loop adaptation values and ultimately, in the estimated fuel ethanol content. This paper analyzes the effect of volumetric efficiency and stoichiometric air-fuel ratio variation of OTTO port fuel injection (PFI) engines when operating on ethanol. Proposals for correction of these parameters are compared to experimental data.
Citation: Engler-Pinto, C. and de Nadai, L., "Volumetric Efficiency and Air-Fuel Ratio Analysis For Flex Fuel Engines," SAE Technical Paper 2008-36-0223, 2008, https://doi.org/10.4271/2008-36-0223. Download Citation
Author(s):
Claudio M. Engler-Pinto, Leandro de Nadai
Affiliated:
General Motors Powertrain - LAAM
Pages: 8
Event:
2008 SAE Brasil Congress and Exhibit
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Air / fuel ratio
Ethanol
Fuel economy
Fuel systems
Fuel injection
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