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|Title:||Computer control of engine-transmission system for improving fuel economy|
|Doctoral Committee Chair(s):||Goering, C.E.|
|Department / Program:||Agricultural and Biological Engineering|
|Discipline:||Agricultural and Biological Engineering|
|Degree Granting Institution:||University of Illinois at Urbana-Champaign|
|Abstract:||A control strategy for improving tractor operating efficiency was proposed in this study. The strategy is to control an engine and a continuously variable transmission (CVT) in such a way that the engine works along a line of minimum brake specific fuel consumption (BSFC).
Analysis and computer simulation indicated that an engine-CVT system can operate stably and track the desired minimum BSFC curve. Fuel savings of over 25% can be achieved with the proposed control strategy, as compared to a conventional tractor. Design of the control for the engine-CVT system can be achieved by designing engine speed control and CVT ratio control independently, provided the controllers are integrated through the minimum BSFC curve. The engine-CVT system can be viewed as an augmented engine, to which a conventional power train can be added to provide a range of ground speeds. The engine-CVT system can be interpreted as an adaptive control system with the CVT ratio being updated continuously to compensate for load variations.
A diesel engine was coupled to a V-belt CVT in the laboratory to validate the proposed control strategy. Test results, indeed, supported the analysis and simulation experiments. Compared to governor-controlled engines on farm tractors, fuel savings of over 15% was achieved with the prototype system, and fuel savings of over 25% could be gained with improved hardware.
|Rights Information:||Copyright 1989 Gui, Xinqun|
|Date Available in IDEALS:||2011-05-07|
|Identifier in Online Catalog:||AAI9010870|
This item appears in the following Collection(s)
Dissertations and Theses - Agricultural and Biological Engineering
Graduate Dissertations and Theses at Illinois
Graduate Theses and Dissertations at Illinois