Heating System for Ethanol and Intake Air - Numerical Model and Experimental Validation at Cold Start in a Flex Fuel Vehicle with Emissions Analysis

Luis Carlos Monteiro Sales, Robinson Ferrari Barbosa, Frederico Mesquita Vilela Oliveira, Zozimo Valdivino Da Silva, Jose Ricardo Sodre

Research output: Contribution to journalConference article


The increasing number of flex fuel vehicles using pure or mainly ethanol when mixed with gasoline led to a necessity of an auxiliary cold start system. These systems are based on introducing gasoline during the engine's cold phase. The researches lead to find an alternative to avoid using gasoline at cold start systems. This works presents a numerical analysis of the flow and heat transfer in a cold start system, using computational fluid dynamics. A prototypal vehicle was used to validate the simulations. The tests were done at controlled ambient temperatures: 0°C for cold start measurements and 25°C at chassis dynamometer to run the FTP75 emission cycle. The numerical data were validated and the results showed the possibility to get a temperature high enough to assure fuel combustion with emissions benefits.

Original languageEnglish
JournalSAE Technical Papers
Issue numberOctober
Publication statusPublished - 6 Oct 2010
EventSAE Brasil 2010 Congress and Exhibit, SAE BRAZIL 2010 - Sao Paulo, Brazil
Duration: 5 Oct 20107 Oct 2010



  • Cold Start
  • Emissions
  • Experimental Method
  • Flex Fuel Engine
  • Fuel Injection
  • Internal Combustion Engine
  • Key-words Ethanol
  • Numerical Method

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