Metoder för synkronisering av körförlopps- och emissionsdata
2006 (Swedish)Report (Other academic)Alternative title
Methods for synchronizing driving patterns and emission data (English)
Empirical investigations of the connection between driving patterns and exhaust emissions are an important basis for estimating emissions from road traffic. A well-known and important measurement problem is the non-constant time delay that arises between engine data (e.g fuel consumption) and emission data. In the report, a number of different suggestions for synchronizing these data are discussed. Three of these methods are investigated in more detail and compared to one another. One of the methods involves matching the minima of lambda values and the corresponding maxima of the carbon monoxide or hydrocarbon rates. The other two methods are based on models for the gas flow through the exhaust system. One of these ("quasi-stationary model") is very simple while the other makes use of more sofisticated gasdynamical models. Due to lack of independent validation data the methods have been evaluated by mutual comparison of their results. Our conclusion is that the quasi-stationary method is the most useful one. The gasdynamical approach does not yield any substantial improvement.
Place, publisher, year, edition, pages
Linköping: VTI., VTI rapport 525 , 2006. , 90 p.
VTI rapport, ISSN 0347-6030
Emission, Time, Engine, Exhaust pipe, Calculation, Measurement, Method, Mathematical model
Research subject Road: Vehicles and vehicle technology, Road: Vehicles and the environment
IdentifiersURN: urn:nbn:se:vti:diva-6415OAI: oai:DiVA.org:vti-6415DiVA: diva2:675292