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US 5,289,095 AGranted
Fuzzy switching logic for servo systems
AssigneeAlliedSignal Inc.
InventorRandall K. Ushiyama
Life of this patent
Estimating the term…
Abstract
An actuator'rate is controlled by a rate servo and the actuator's position is controlled by a position control. The position control can be a position servo or a mechanical brake. Selection of either the rate servo or position control is made by fuzzy switching logic.
Claims19
Apparatus for controlling an actuator, comprising:
- fuzzy logic means, responsive to a motor rate command and an indicated motor rate, for selecting from a plurality of modes of operation including a slewing mode and a position mode;
- and
- control means, responsive to said fuzzy logic means, for controlling said actuator's rate when said slewing mode is selected and for controlling said actuator's position when said position mode is selected.
Apparatus for controlling an actuator, comprising:
- rate servo means, responsive to an enable signal, for controlling said actuator's rate in accordance with a rate command;
- position control means, responsive to said enable signal, for holding the position of said actuator;
- and
- fuzzy logic means, responsive to said actuator rate and said actuator rate command, for generating said enable signal, which indicates whether said rate servo means or said position control means should be selected to control said actuator.
1 more element
Apparatus for selecting a mode of operation for an actuator, said modes including a slewing mode and a position mode, said apparatus comprising:
- fuzzy rule means for grading at lest two criteria of said actuator, said criteria including rate and a rate command;
- operator means, responsive to said fuzzy rule means, for evaluating said graded criteria;
- and
- defuzzifier means, responsive to said operator means, for generating an enable signal indicating the mode to be selected, said slewing mode being selected when said graded rate command exceeds a first threshold, said position mode being selected when said graded command does not exceed said first threshold and said graded rate falls below a second threshold or when said graded rate command does not exceed said first threshold and said position mode was previously selected.
1 more element
Dependencies are inferred from the claim text.