Apparatus for relay based multiple point process frequency response estimation and control tuning

[摘要] Briefly, a preferred embodiment of the present invention includes an apparatus for tuning a regulator in a process controller. The digitized output from a standard relay and a parasitic relay are fed through digital to analog converter providing signals at 0.5.omega..sub.c, .omega..sub.c and 1.5.omega..sub.c to the process, where .omega..sub.c is the process critical frequency. The apparatus records the digitized relay output u;; and the digitized process output y;; until stationary oscillations are reached. The outputs u;; and y;; are then used to calculate the process frequency response at 0.50.omega..sub.c, .omega..sub.c and 1.5.omega..sub.c. This data is then used to design the regulator, the output of which is converted to analog form and inputted to control the process.