초록 ▼

A direct adaptive fuzzy controller having an adaptation mechanism that modifies the locations of output membership functions to improve performance of the fuzzy controller. The controller has a fuzzy rule base that has a different or unique output membership function for each fuzzy rule. The adaptat

A direct adaptive fuzzy controller having an adaptation mechanism that modifies the locations of output membership functions to improve performance of the fuzzy controller. The controller has a fuzzy rule base that has a different or unique output membership function for each fuzzy rule. The adaptation mechanism modifies the location of the output membership functions in response to the performance of the controller system, to continuously improve its performance. The controller is a feedback mechanism that functions not only using measured outputs of the process controlled, but has feedforward compensation that causes the controller to anticipate feedback due to measured disturbances or other parameters of the process. The adaptive fuzzy controller can be used for various processes, including combi-boiler domestic hot water temperature control, automobile cruise control, a residential thermostat, duct air temperature or static pressure control for the air handling unit in a heating ventilation and air conditioning system, and furnace temperature control for curing parts.

대표청구항 ▼

[ We claim:] [1.] A adaptive fuzzy controller for controlling a process, comprising:an input processing unit;an adaptive fuzzy control logic unit connected to said input processing unit;an output processing unit connected to said adaptive fuzzy control logic unit;a sensor proximate to the process an

[ We claim:] [1.] A adaptive fuzzy controller for controlling a process, comprising:an input processing unit;an adaptive fuzzy control logic unit connected to said input processing unit;an output processing unit connected to said adaptive fuzzy control logic unit;a sensor proximate to the process and connected to said input processing unit; andan actuator, for controlling the process, connected to said output processing unit; andwherein:said adaptive fuzzy control logic unit comprises:an adaptation mechanism connected to said input processing unit; anda fuzzy control logic unit connected to said adaptive mechanism and to said input and output processing units;said sensor provides a process parameter measurement to said input processing unit;said input processing unit has an input for a process parameter setpoint;said adaptation mechanism:computes an error measure between the process parameter measurement and the process parameter set point;determines whether the absolute value of the error measure is less than an adaptation threshold;does nothing further if the absolute value of the error measure is less than the adaptation threshold;obtains degrees of use of fuzzy rules and current locations of output rule membership functions from said fuzzy control logic unit;calculates new locations of the output rule membership functions; andsends the new locations to said fuzzy control logic unit;said fuzzy control logic unit comprises:a fuzzifier connected to said output processing means;a fuzzy inference engine connected to said fuzzifier and to said adaptation mechanism;a defuzzifier connected to said inference engine and to said output processing unit;a collection of input membership functions unit connected to said fuzzifier;a collection of output membership functions unit connected to said adaptation mechanism and said defuzzifier; anda fuzzy rule base connected to said fuzzy inference engine, said collection of input membership functions unit and said collection of output membership functions unit;said sensor provides an environment disturbance parameter measurement to said input processing unit;said input processing unit has an input for receiving parameters for configuring and adjusting the adaptation fuzzy controller;the process is hot water temperature control of a boiler;said sensor comprises:a temperature sensor; anda flow rate sensor;the process parameter measurement is hot water temperature;the environment disturbance parameter measurement is hot water flow rate; andsaid actuator is an actuator of a gas valve which controls a flow of gas to a combustion process of the boiler, for heating hot water.