Ombordmätning av bränsleförbrukning och avgasemissioner för en katalysatorbil vid körförlopp i verklig trafik

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Magnus Lenner

Fuel consumption, emissions of nitrogen oxides (NOx) and hydrocarbons (HC)  for a gasoline passenger car with catalyst were measured on-the-road for  three driving patterns. The on board measurement system developed at VTI  includes analyzers for gaseous pollutants, fuel flow metering, temperature  registration (oil, cooling water, fuel etc., total eight cases) as well as  logging of time and distance. Effects on emissions and fuel consumption of  road type and of cold start were studied. Distances of the three traffic  types representing City centre, Intermediate area and Motorway were  respectively 16.7 km, 20.1 km and 31.5 km. They were chosen to reflect the  traffic patterns mentioned.

Nitrogen oxides formation is favoured by the good  (complete) combustion resulting from high and constant engine load. This is  borne out by NOx emissions vs. mileage rising in order: City centre,  Intermediate, Motorway. Hydrocarbons and carbon monoxide, on the contrary,  are oxidized (to form carbon dioxide and water) by complete combustion, as  illustrated by HC declining in the same sequence. Fuel consumption decreasing  according to City centre, Intermediate, Motorway corroborates prevalent data  to the effect that specific fuel consumption is seen to increase with speed  in the high speed range. The report also describes extending of the  fuel/pollutant measurement instrumentation with a broadband alpha-sensor and  IR analyzers for monitoring of CO2 and high range CO and of low range CO.

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