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Investigation of Accuracy in Fuel Economy Measurement Methods
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Vehicle Dynamics.
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [sv]

Bakgrunden till det här examensarbetet är den ökade relevansen av att minska fordons bränsleförbrukning på grund av faktorer så som minskade oljeresurser och ökande bränslepriser. Tidigare utförda tester har visat att verklig bränsleekonomi skiljer sig nämnvärt från bränsleekonomi uppmätt med hjälp av simulerad vägkorsning i chassidynamometer. I det här arbetet undersöks noggranhet och repeterbarhet för olika mätmetoder som ofta används vid bränsleförbrukningsmätningar. Detta görs genom en teoretisk undersökning av noggrannheten för tillgänglig mätutrustning och en testserie med gradvis ¨okad komplexitet bestående av tester på chassidynamometer och väg. Testerna utförs med en Scania G450 lastbil som utrustats med en portabel bränsleflödesmätare och portabel avgasanalysator (PEMS). Variabler såsom temperaturer, motor-mod och vridmoment upptaget av olika externa aggregat analyseras för att ¨oka förståelsen för hur fordonets tillstånd skiljer sig mellan olika korningar. Vidare undersöks möjligheter inom sensorfusion för förbättring av mätnoggrannheten. Erhållna resultat visar att mätnoggrannheten för de olika utrustningarna ¨ar av storleksordningen 1 % vid vägkorsning men betydligt bättre vid körning i chassi-dynamometer. Det kan konstateras att ¨andringar av interna motorförluster påverkar bränsleekonomin i stor utsträckning även i kontrollerade testmiljöer. Slutligen kan det fastställas att bränsleflödesmätaren och den fordonsinterna bränsleförbrukning-uppskattningen reagerar likvärdigt på ändringar i bränsleförbrukning, medan den på avgasanalys baserade metoden reagerar annorlunda.

Abstract [en]

The background of this master thesis is the increased importance of improving vehicle fuel economy due to factors such as decreasing oil resources and growing fuel prices. Earlier performed tests have shown that real-world fuel economy is deviating signif-icantly from fuel economy (FE) measured in simulated road driving. In this thesis the accuracy of the fuel economy measurement methods used in such measurements are investigated. It is done by examining the performance of different fuel economy measurement devices and by performing a test series with subsequently increased complexity. The test series consists both of chassis dynamometer and on road test-ing. All tests are performed with a Scania G450 long haulage truck which has been equipped with a portable fuel flow meter and a portable emissions measurement sys-tem (PEMS). Variables such as temperatures, engine mode and torques taken up by different auxiliary devices are analysed to improve the understanding about how the vehicle state is differing between different test drives. It is investigated if sensor fusion can be used to improve accuracy and repeatability in cases when multiple fuel consumption (FC) measurement devices are used. Obtained results show that the accuracy of the different fuel economy measurement methods investigated has an order of magnitude of 1 % for real-world on-road testing. The results do also show that a change of engine frictional losses are influencing the fuel economy significant in controlled environments. Finally it is concluded that the vehicle internal fuel economy estimation is reacting to changes in fuel economy in a similar way as the fuel flow meter estimation. The method based on exhaust gas analysis is deviating from this behaviour.

Place, publisher, year, edition, pages
2015. , 78 p.
Series
TRITA-AVE, ISSN 1651-7660 ; 2014:43
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-180458OAI: oai:DiVA.org:kth-180458DiVA: diva2:894067
Subject / course
Vehicle Engineering
Examiners
Available from: 2016-04-08 Created: 2016-01-14 Last updated: 2016-04-08Bibliographically approved

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