Engine management for Flex Fuel plus compressed natural gas vehicles
Ethanol has been used in Brazil as a passenger vehicle fuel since 1979. Until the year 2000, vehicles were made to run exclusively with either gasoline or ethanol. The MultiFuel engine control module (ECM) was developed allowing vehicles to use fuels with any ethanol percentage, relying only on the existing oxygen sensor as opposed to an add-on ethanol sensor for the percent ethanol evaluation. The use of tank fuel level information allowed for far more robust ethanol percent detection and improved drivability. Four years later, compressed natural gas (CNG) capability was integrated into the MultiFuel technology. Prior to that, vehicles using CNG normally required a second ECM. The MultiFuel integrated with CNG capability is known as the Tri-Fuel system. It uses only one ECM, seamlessly controlling both liquid (ethanol blends and gasoline) and CNG fuels with little power loss, and excellent drivability and fuel consumption. This paper will present both the MultiFuel and Tri-Fuel technologies.
KeywordsBiomass Combustion Methane Dioxide Corn
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- 1.Brazilian Automotive Industry Yearbook, 2004Google Scholar
- 2.Richard S (1999) Introduction to internal combustion engines, 3rd edn. SAE and Macmillan, Washington, DCGoogle Scholar
- 3.Theunissen FMM (2003) Percent ethanol estimation on sensorless multi fuel systems: advantages and limitations. SAE Technical Paper no. 2003-01-3562Google Scholar
- 4.Bosch R (1996) Automotive handbook, 4th edn. Wiley, New YorkGoogle Scholar
- 5.FuelTable, US Department of Energy. Also at www.eere.energy.gov
- 6.Combustíveis para Motores Endotérmicos, Enfoque no Gás Natural Veicular. Diocles Dalavia. PetrobrásGoogle Scholar
- 7.Renewable energy in developing countries (2003) Renewable energy world, July-AugustGoogle Scholar
- 8.Brazil taking the lead in biofuels (2005) Petrol World AugustGoogle Scholar
- 9.Gás Natural na Matriz de Combustíveis Veiculares (2005) Luciana Bastos de Freitas Rachid, PetrobrasGoogle Scholar
- 10.Well-to-Tank Energy Use and Greenhouse Gas Emissions of Transportation Fuels (2001) North American analysis, vol. 2, Argonne, ILGoogle Scholar