Reducing exhaust emissions in ethanol-fueled engines during cold start

Luis Carlos Monteiro Sales, José Ricardo Sodré*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


This work describes the improvements on exhaust emissions and cold start obtained through utilization of a new type of cold-start auxiliary system for ethanol-fueled engines. Lower amounts of the gasoline used to help cold start and of ethanol injected during cold start and warm-up were used via introduction of a fuel injector in the new cold-start auxiliary system. The redesigned system allowed for faster and uniform cold start, in comparison to the conventional system, of around 31.1%. Reductions of raw hydrocarbon and carbon monoxide emissions in the cold stage of the FTP-75-based emissions test cycle were about 8.6 and 17.2%, respectively, while oxides of nitrogen and aldehyde emissions remained unchanged.

Original languageEnglish
Pages (from-to)1535-1550
Number of pages16
JournalCombustion Science and Technology
Issue number8
Publication statusPublished - 1 Aug 2003


  • Aldehyde emissions
  • Cold start
  • Ethanol fuel
  • Internal combustion engine


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