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Influence of Parameter "ltrip" on Cold Emissions Estimation ltrip Influences Cold Emissions Calculation

The parameter "ltrip" affects the estimation of cold emissions produced by vehicles. This study delves into how ltrip impacts emission calculations at low temperatures. The equation used is Ecold = b * N * M * ehot * (ecold/ehot – 1). Key factors include b as the fraction of the distance traveled with a cold engine or catalyst operating below "light-off" temperature, and ehot as the emission factor at hot temperatures. The over-emission ratio eCOLD/HOT also plays a role for specific pollutants. The study finds that ltrip also affects evaporative emissions.

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Influence of Parameter "ltrip" on Cold Emissions Estimation ltrip Influences Cold Emissions Calculation

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  1. INFLUENZA DEL PARAMETRO “ltrip “ SULLA STIMA DELLE EMISIONI

  2. ltrip influenza le emissioni a freddoEcold = b*N*M * ehot *(ecold/ehot –1) • Ecold = Emissioni a freddo • b = frazionedella percorrenza condotta con il motore freddo o con il catalizzatore operante al di sotto della temperatura di “light-off”. • ehot =Fattore di emissione a caldo • eCOLD/HOT=Over-emission ratios per l’inquinante specifico

  3. b=0,6474-0,02545*ltrip-(0.00974-0.000385*ltrip)*ta8 km<ltrip<15 kmltrip influenza anche le emissioni evaporative.

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