Avgasemissioner och bränsleförbrukning för elva personbilar av samma typ: inom- och mellanvariationer hos mätdata

Mari-Ann Gripmark
Magnus Lenner

Measurements of engine speed, effect, torque, fuel consumption, and emissions of carbon dioxide, nitrogen monoxide, hydrocarbons and carbon monoxide at various engine work points defined by effect/engine speed, were made for eleven VW Polo cars of year model 1988. An APG-dynamometer (Automatic Performance Guide) was used in the experiments. One of the vehicles was tested twice on different occasions.

Confidence intervals for single vehicles were calculated on the assumption that the measured value is a normally distributed stochastic variable. When the corresponding confidence interval for a group of vehicles is stated, the measured values are presumed to be mutually independent and equally distributed.

Large differences, between different vehicles, in emissions of NO and HC were registered. The emissions of CO also exhibit considerable variability, while the results for fuel consumption, and consequently for emissions of CO2, were much more uniform.



Cost Benefit Analysis (CBA) workshop in Stockholm

An open seminar and workshop in Stockholm will be held on 25-26 April 2018. The workshop deals with the use of CBA as a basis for decision-making in the public sector. The workshop is organized by, among others, Professor Jan-Eric Nilsson, VTI.



Ulf Sandberg has been presented with the TTI Lifetime Achievement Award 2018

VTI’s Senior Research Leader Ulf Sandberg has been presented with the TTI Lifetime Achievement Award 2018 for his work on research into tyres and road surface.


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FALCON examines challenges in the transport sector

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VTI joined research cooperation in China

In December 2017 VTI became a member of China-Sweden Research Centre for Traffic Safety (CTS).


Swedish German research collaboration on Electric Road Systems

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Electric Road Systems Conference 2018

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