Patent ID: 6442534
Filing Date: 2002-08-27
Classification: G05B

Abstract:
A control system for an actuator, the actuator receiving a command signal causing actuation of the actuator and providing at least one feedback signal indicating resultant actuation of the actuator, the control system comprising:a first feedback controller receiving a feedback signal and tuned for a first operating condition of the actuator and providing a first output signal; a second feedback controller receiving a feedback signal and tuned for a second operating condition of the actuator different from the first operating condition and providing a second output signal; and a fuzzy logic circuit receiving the first and second output signals to: (i) generate an output K indicating a relative magnitude of the first and second output signals; (ii) evaluate K according to at least two fuzzy categories indicating the relative magnitude of the first and second output signals; (iii) apply rules to the fuzzy categories providing less weighting to one of the first and second output signals having greater relative magnitude to produce fuzzy output values; and (iv) combine the fuzzy output values to a single control output to the actuator.