Patent ID: 6647312
Filing Date: 2003-11-11
Classification: D21G,G05B

Abstract:
An adaptive control method for controlling a process by calculating a manipulated variable from a deviation between a setpoint variable and a control output variable and then using said manipulated variable, said method comprising the steps of:performing frequency analysis on time series data of said control output variable; determining a range of periods within which either rate of change in frequency response amplitude of said control output variable in relation to a control gain ratio or a substantive function, is positive, wherein said substantive function is a function of frequency and whose sign is same as that of said rate of change; and increasing control gain by a given value when maximum value of an amplitude obtained by decomposing said time series data within said range of periods into frequency components is larger than a first value, or decreasing said control gain by a given value when said maximum value is smaller than a second value.