Abstract
A proportional reducing valve has heen applied to an automatic transmission to control shift operation. The control system must be designed as cL robust control system considering modeling error caused by changes in characteristics of the valve and a frictional coefficient. In this study, a brake mechanisml of an automatic transmission is considered as a controlled plant. Two-degree of freedom control of rotating speed is studied in which the modeling error is took into account. A. feedback controller is designed based on μ synthesis. Adding a feedforward controller, a two-degree of freedom control system is constructed. The control system is examined experimentally using cl commercial proportional reducing valve. It is demonstrated that shift operation can be precisely controlled by the control system under the fluctuating factors.
