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Design of Virtual Crank Angle Sensor based on Torque Estimation
KTH, School of Electrical Engineering (EES).
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The topic of thesis is estimation of the crank angle based on pulse signals from an induction sensor placed on the flywheel. The engine management system performs many calculations in the crank angle domain which means that a good accuracy is needed for this measurement. To estimate the crank angle degree the torque balance on the crankshaft based on Newtons 2nd law is used. The resulting acceleration is integrated to give engine speed and crank angle. This approach is made for two crankshaft models, the rigid crankshaft approach and the lumped mass model. The latter can capture the torsional effects of the crankshaft twisting and bending due to torques acting on it. This is then compared to a linear extrapolation of the engine speed which is the chosen method today. To validate results experiments was performed where data for 36 stationary operating points was gathered. The results indicate that using a torque based model and predicting torsion improves the accuracy of the crank angle measurement especially for higher engine speeds. The rigid crankshaft approach does not give enough improvement of the accuracy to warrant further work.

Abstract [sv]

Detta examensarbete handlar om att ta fram en metod för att uppskatta vevvinkel från pulser från en induktionssensor placerad på svänghjulet. Motorns styrsystem utför många beräkningar med vevvinkeln som bas och därför krävs hög noggrannhet. Den valda metoden ärr att använda momentbalans på vevaxeln baserat på Newtons andra lag. Accelerationen som fås från denna ekvation integreras sedan för att ge motorvarv-tal och vevvinkel. Denna metod görs för två fall av vevaxel modell. En stel vevaxel och en fler-mass modell som används för att förutspå förvridningar i axeln. Detta jämförs sedan med en linjär extrapolation av hastigheten vilket är tillvägagångsättet idag. För att kunna validera modellerna samlades data in i experiment som utfördes för 36 stationära arbetspunkter. Resultaten visar på att en momentmodell som även förutspår förvridningar ger en förbättrad uppskattning av vevvinkeln. Den stela vevaxel modellen ger inte tillräckligt förbättrad prestanda för att vara värd fortsatt arbete.

Place, publisher, year, edition, pages
2016. , 53 p.
Series
EES Examensarbete / Master Thesis, TRITA EE 2015:116
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-187680OAI: oai:DiVA.org:kth-187680DiVA: diva2:931088
Examiners
Available from: 2016-05-26 Created: 2016-05-26 Last updated: 2016-05-26Bibliographically approved

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