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Exhaust Analyser for Simplified Emissions Testing on Heavy Duty Vehicles
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Avgasanalysator för förenklad emissionsanalys av tunga fordon (Swedish)
Abstract [en]

Over the years the regulations on emissions from heavy duty vehicles have become stricter. Emission measurements during development are therefore done by the manufacturers in order to check compliance in an early stage. This is a time demanding process due to complicated installation and operation of the test equipment. Therefore a simplified concept for replacing such equipment was evaluated and a prototype was designed capable of measuring NOx concentration, exhaust volume flow and CO2 concentration together with reading on board diagnostic messages over CAN in order to include additional truck sensory data. This report describes the development process and contains modular tests of the prototypes separate modules as well as a whole systems test against Horiba OBS-2200, a portable emissions measurement system, in a truck. The results from the tests were that NOx concentration, exhaust volume flow, CO2 concentration and NOx accumulated mass showed good correlation with the references used. The prototype system achieved a coefficient of determination, R2 value, of 0.988 for the NOx mass flow compared to the reference and a total error of less than 7% of accumulated NOx mass.

Abstract [sv]

Med introduktionen av Euro VI har kraven på lägre utsläpp från tunga fordon skärpts. För att kunna uppnå dessa krav är det naturligt att emissionstester utförs även på utvecklingsfordon som en del av utvecklingsprocessen. Dessa tester är tidskrävande på grund av komplicerad installation och svårhanterad utrustning. För att minska problemen med utvecklingstester utvärderades ett nytt koncept för mätning av NOx koncentration, avgasflöde och CO2 koncentration samt avläsning av OBD-data. Denna rapport beskriver utvecklingsprocessen av en prototyp och utvärdering av moduler samt test av hela prototypen mot Horiba OBS-2200, en emissionsmätutrustning som används på Scania CV AB, på en lastbil. Resultaten visar att NOx koncentration, CO2 koncentration, avgasflöde och ackumulerat NOx massutsläpp kan mätas med bra överensstämmelse mot referensutrustningen. Prototypen uppnådde en determinationskoefficient på 0.988 för massflöde av NOx relativt referensen och hade ett totalt fel på mindre än 7% i ackumulerad NOx-massa.

Place, publisher, year, edition, pages
2014. , 110 p.
, MMK 2014:50 MDA 476
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-157660OAI: diva2:770910
Available from: 2014-12-11 Created: 2014-12-11 Last updated: 2015-11-04

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