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Model based shift point control for city bus
2002 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

To stay competitive the bus industry must meet the challenges of reducing the fuel consumption and shortening the overall development time. To do that creativity, new perspective and new working methods have to be used. The shift point control has a major impact on the overall fuel consumption and conventional shift point control development is a demanding and time- consuming process. The goal for this thesis was to develop a new model based shift point control by using simulation and modeling as tools. The control should be implemented in a bus model and evaluated by simulations. The thesis also gives an introduction to the bus and its surrounding as modeling objects. Volvo Truck Corporation has developed models for a complete truck and its surrounding model. Parts of these models can be used also for modeling a bus even though some modifications might be needed. Other components as the help systems and bus stops are unique for busses and were developed. To fulfill the goal a computer model of the complete bus was modeled in Simulink, which is a toolbox to Matlab. The bus route 85 in Gothenburg was used to define the drive cycle, the model was verified against a real bus, and it turned out to be reliable for the chosen context. A new model based shift point control was then implemented. The control algorithm was designed to use the optimum gear, with respect to fuel consumption, for each driving situation. This is accomplished by using a model of the power train that determine the alternative engine working points for the different gears and then the gear with lowest fuel consumption is chosen. Simulation and modeling is also treated in the thesis together with the tools used for this. Simulations of the bus model replace extensive testing in a real bus. The conclusion of this thesis is that simulation and modeling are powerful tools which usefulness will increase, as the systems grow more and more complex. It will shorten the lead-time and reduce the cost by reducing the test hours needed in a real bus. The developed shift point strategy proved to be very competitive from a fuel point of view. The evaluation showed that it is possible to decrease the fuel consumption with 5% while having a slight higher performance. No negative effects on other shift point properties as comfort or gear hunting could be observed with this new control. The goals of the thesis were therefore met. Future work in these areas should focus on the possibility to evaluate control strategies in a real bus and to improve the work with models. There are several aspects to the last statement. Working with models starts to get “cross functional” meaning that the need for exchanging models grows. This would benefit by a standardized documentation and interfaces of models. There are also several systems in the bus for which no general models exist yet. The quality of the models them self could also be improved, foremost by asking the supplier to provide models of their components.

Place, publisher, year, edition, pages
2002.
Keyword [en]
Technology, bussar, växellådor, modeller, simulering
Keyword [sv]
Teknik
Identifiers
URN: urn:nbn:se:ltu:diva-44164ISRN: LTU-EX--02/174--SELocal ID: 1f7670bb-2e76-4a3d-9805-68422fea6249OAI: oai:DiVA.org:ltu-44164DiVA: diva2:1017439
Subject / course
Student thesis, at least 30 credits
Educational program
Electrical Engineering, master's level
Examiners
Note
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
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Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
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Output format
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