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<p>This study proposes an adaptation of the methodology for calculating Non-Methane Organic Gases (NMOG), based on ABNT NBR 6601, aimed at application in the industrial engine development process. The proposed approach relies on engine dynamometer testing, in contrast to the chassis dynamometer tests prescribed by the standard, which simulate urban driving conditions. The motivation for this approach lies in the fact that the highest NMOG emission concentrations occur during the initial moments of cold start, a critical period for calibration adjustments. Consequently, the method enables rapid and targeted evaluations during the early stages of development, prior to the execution of regulatory homologation tests. The experiments were conducted under controlled climatic conditions, with ambient temperatures ranging from 14 to 22&#xa0;°C, using a turbocharged, four-cylinder, spark-ignition (Otto cycle) engine fueled with ethanol. The results revealed pronounced NMOG peaks immediately after cold start, allowing the total test duration to be reduced to approximately 120&#xa0;s, compared to 1,874&#xa0;s for the complete FTP-75 cycle. The proposed adaptation proved to be technically feasible, consistent with the principles of the standard, and effective in optimizing the development and calibration of flex-fuel engines, providing significant savings in time and resources.</p>

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Adaptation of NMOG Calculation for Cold Start Tests Performed on Motor Dynamometer

  • 期刊论文

  • 发表日期：

    2026年7月11日

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  • Flavio Bernardes Couto Moreira,
  • Rafael Lúcio Nascimento Silva,
  • Julia Souto de Souza Rodrigues,
  • Raquel Ianine Lima de Souza,
  • Andressa Castro Vilas Boas Louback,
  • Júlio Cézar de Alvarenga Pires,
  • Thiago Werner Louback,
  • Kamilla de Lima Ribeiro Palhares,
  • Remo Dias Bahia de Carvalho,
  • Iolanda de Lourdes Gonçalves Dias

摘要

This study proposes an adaptation of the methodology for calculating Non-Methane Organic Gases (NMOG), based on ABNT NBR 6601, aimed at application in the industrial engine development process. The proposed approach relies on engine dynamometer testing, in contrast to the chassis dynamometer tests prescribed by the standard, which simulate urban driving conditions. The motivation for this approach lies in the fact that the highest NMOG emission concentrations occur during the initial moments of cold start, a critical period for calibration adjustments. Consequently, the method enables rapid and targeted evaluations during the early stages of development, prior to the execution of regulatory homologation tests. The experiments were conducted under controlled climatic conditions, with ambient temperatures ranging from 14 to 22 °C, using a turbocharged, four-cylinder, spark-ignition (Otto cycle) engine fueled with ethanol. The results revealed pronounced NMOG peaks immediately after cold start, allowing the total test duration to be reduced to approximately 120 s, compared to 1,874 s for the complete FTP-75 cycle. The proposed adaptation proved to be technically feasible, consistent with the principles of the standard, and effective in optimizing the development and calibration of flex-fuel engines, providing significant savings in time and resources.