A proportional reducing valve is applied to an automotive automatic transmission system to control shift operation. Its control system must be designed as a robust control system that considers modeling errors caused by changes in the characteristics of the valve. A braking mechanism of an automotive automatic transmission system is considered. Two-degree-of-freedom control of the rotating speed is studied, in which modeling errors due to changes in the characteristics of a proportional reducing valve are taken into account. A feedback controller is designed, based on micro synthesis, in which both changes in the characteristics of the valve and variations of a frictional coefficient are considered as uncertainties of a nominal model. Introducing a feedforward controller, a two-degree-of-freedom control system is constructed. The control system is examined through experiments using a commercial proportional reducing valve. The shift operation is precisely controlled by the control system under these fluctuating factors.
A study of two-degree-of-freedom control of rotating speed in an automatic transmission, considering modeling errors of a hydraulic system
Robuste Drehzahlregelung in einem hydraulischen Fahrzeug-Automatikgetriebe unter Verwendung der Sollwertvorsteuerung
Control Engineering Practice ; 6 , 9 ; 1125-1132
1998
8 Seiten, 11 Bilder, 2 Tabellen, 14 Quellen
Aufsatz (Zeitschrift)
Englisch
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