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Energy Management of Parallel Hydraulic Hybrid Wheel Loader
KTH, School of Electrical Engineering and Computer Science (EECS).
2018 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Hybridization of driveline system is one possible solution to increase fuel eciency.In this thesis a parallel hybrid hydraulic wheel loader concept was studied. A highpressure accumulator was added to the system and acted as a second source of energy.By adding the high pressure accumulator, regenerative braking energy canbe stored for later utilization. A backward facing simulation model was developedwhere the high pressure accumulator's State Of Charge (SOC) as state variableand hydraulic pump/motor's displacement as control input. Furthermore, dierentenergy management strategies: Dynamic Programming (DP), rule-based andEquivalent Consumption Minimization Strategy (ECMS) were developed. Thesestrategies were evaluated and compared to each other all with respect to the fuelconsumption. The result from conventional machine acted as the benchmark forother strategies to compare with. From simulation results, rule-based strategiesshowed to be the most robust, resulted in lower fuel consumption in every testeddriving cycle. For ECMS, the performance varied from cycle to cycle. A reductionin fuel consumption was observed for short-loading cycles. Especially in one cycle,ECMS result outclassed rule-based and was almost the same as DP. However, asmall increment was observed for long-carry cycle. Here the introduction of lock-upfeature in the torque converter yielded instead the most fuel saving. These valuableconclusions acted perfectly as a good starting point for future product development.

Abstract [sv]

Hybridisering av drivlinan är en möjliga lösning för ökad bränsleeffektivitet. En par-allell hybrid hydraulik hjullastare koncept undersöktes i detta arbetet. Genom att sätta en extra högtrycksackumulator till systemet kunde regenerativ bromsningsenergi lagras för senare användning. En bakåt simuleringsmodell med ackumulators laddningstillstånd som tillståndsvariabel och hydraulisk pumps/motors förflyttning som reglering signal utvecklades tillsammans med olika energy regleringstrategier så som: dynamisk programmering (DP), regelbaserad (RB) och Ekvivalent Konsumtion Minimering Strategi (engelska ECMS). Strategierna evaluerades och jämfördes med hänsyn till bränsleförbrukningen där resultaten från konventionella maskinen användes som referens. Regelbaserad strategier visades vara mest robusta där bränsleförbrukning minskades för alla testade körcyklar. För ECMS varierades resultatet mellan olika körcyklar. En minskning av bränsle förbrukning noterades for alla kortcyklar. För en cykel utklassade ECMS RB och var nästan lika bra som DP. För långcyklar resulterade ECMS i en liten ökning av bränsleförbrukning. Att introducera ”låsa-in” funktion i momentomvandlare gavs den störta bränsleminskningen.Slutsatserna var mycket värdefulla till framtidens utveckling.

Place, publisher, year, edition, pages
2018. , p. 52
Series
TRITA-EECS-EX ; 2018:758
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-246097OAI: oai:DiVA.org:kth-246097DiVA, id: diva2:1295780
External cooperation
Volvo Construction Equipment
Educational program
Master of Science - Systems, Control and Robotics
Examiners
Available from: 2019-03-12 Created: 2019-03-12 Last updated: 2019-03-12Bibliographically approved

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