Blucher Engineering Proceedings

Setembro 2016, vol.3, num.1 - XXIV Simpósio Internacional de Engenharia Automotiva
Artigo - Open Access Idioma principal | Segundo principal

HOW VEHICULAR ENERGETIC EFFICIENCY IS INFLUENCED BY COAST DOWN COEFFICIENTS VARIATION?

COMO A EFICIÊNCIA ENERGÉTICA VEICULAR É INFLUENCIADA PELA VARIAÇÃO DOS COEFICIENTES DE COAST DOWN?

MAIA, Décio Magioli; VILLELA, Antonio Carlos Scardini; CARVALHO, Rogério Nascimento de

Artigo:

Energetic efficiency of Brazilian light-duty vehicles is based on urban and highway autonomies that are obtained by following NBR 7024 [1] standard, which requires that tests be carried out on chassis dynamometers. To simulate the real-world behavior of vehicles it is necessary to set the coast down coefficients in the dynamometer control system. These coefficients define the road load curve that represents wheels rolling and aerodynamic resistances to the vehicle movement, obtained at test tracks according to NBR 10312 [2] standard.

In function of environmental conditions during tests, coast down coefficients can significantly vary and impact urban and highway autonomies. This work studies the impact on urban and highway autonomies when coast down coefficients obtained on the track are varied up to 15%, separately or simultaneously. Autonomy results were compared to those obtained using the original load curve, posed with the original track coefficients.

Energetic efficiency of Brazilian light-duty vehicles is based on urban and highway autonomies that are obtained by following NBR 7024 [1] standard, which requires that tests be carried out on chassis dynamometers. To simulate the real-world behavior of vehicles it is necessary to set the coast down coefficients in the dynamometer control system. These coefficients define the road load curve that represents wheels rolling and aerodynamic resistances to the vehicle movement, obtained at test tracks according to NBR 10312 [2] standard.

In function of environmental conditions during tests, coast down coefficients can significantly vary and impact urban and highway autonomies. This work studies the impact on urban and highway autonomies when coast down coefficients obtained on the track are varied up to 15%, separately or simultaneously. Autonomy results were compared to those obtained using the original load curve, posed with the original track coefficients.

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DOI: 10.5151/engpro-simea2016-PAP103

Referências bibliográficas
  • [1] ABNT Brazilian Norm, “Light road vehicles – Fuel consumption determination – Test method”, ABNT NBR 7024, Rev. Apr. 2010.
  • [2] ABNT Brazilian Norm, “Light duty road vehicles — Road load measurement and dynamometer simulation using coast down techniques”, ABNT NBR 10312, Rev. Sep. 2014.
  • [3] ABNT Brazilian Norm, “Light road vehicles — Determination of hydrocarbon, carbon monoxide, nitrogen oxide, carbon dioxide and particulate material on exhaust gas”, ABNT NBR 6601, Rev. Oct. 2012.
Como citar:

MAIA, Décio Magioli; VILLELA, Antonio Carlos Scardini; CARVALHO, Rogério Nascimento de; "HOW VEHICULAR ENERGETIC EFFICIENCY IS INFLUENCED BY COAST DOWN COEFFICIENTS VARIATION?", p-813-819. In: Anais do XXIV Simpósio Internacional de Engenharia Automotica - SIMEA 2016 [=Blucher Engineering Proceedings].. São Paulo: Blucher, 2016.
ISSN 23577592, DOI 10.5151/engpro-simea2016-PAP103

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