Computer control of engine-transmission system for improving fuel economy
Gui, Xinqun
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Permalink
https://hdl.handle.net/2142/22771
Description
Title
Computer control of engine-transmission system for improving fuel economy
Author(s)
Gui, Xinqun
Issue Date
1989
Doctoral Committee Chair(s)
Goering, C.E.
Department of Study
Agricultural and Biological Engineering
Discipline
Agricultural and Biological Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Agricultural
Engineering, Automotive
Language
eng
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.
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