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The Universal Control and Protection Hydraulic Automaton for Hydromechanical Transmissions
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 05, 2001 by SAE International in United States
Annotation ability available
Event: SAE 2001 World Congress
Modern hydromechanical transmissions are equipped with electronic-hydraulic (mechatronic) control systems having much more functional capabilities compared to classic hydraulic systems.
However, automatic hydraulic systems are widely used not only as the basic transmissions' control device and a mechanical part of mechatronic systems but also as an important facility providing reliability and safety of such systems.
At the same time such an application has quite a number of restrictions, especially for transmissions with a great number of gearstages. One of the main reasons is the inability to control more than 3 or 4 stages of gears while using the vehicle's speed as a control parameter. It deals with the parabolic characteristic of the output pressure of centrifugal governor used as the vehicle speed sensor.
This restriction can be eliminated by using a hydraulic detector of torque converter's turbine (i.e. input shaft of gearbox) speed. The paper considers the operating principles, design and testing of such a hydraulic automaton capable of controlling converter's lock-up clutch. It may be used in hydromechanical transmissions as the system's back up and protection or as a self-sufficient hydraulic automaton.
CitationKrasnevski, L., Vysotski, M., and Boikov, V., "The Universal Control and Protection Hydraulic Automaton for Hydromechanical Transmissions," SAE Technical Paper 2001-01-0879, 2001, https://doi.org/10.4271/2001-01-0879.
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