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Title:Computer control of engine-transmission system for improving fuel economy
Author(s):Gui, Xinqun
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
Subject(s):Engineering, Agricultural
Engineering, Automotive
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.
Issue Date:1989
Rights Information:Copyright 1989 Gui, Xinqun
Date Available in IDEALS:2011-05-07
Identifier in Online Catalog:AAI9010870
OCLC Identifier:(UMI)AAI9010870

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