Patent ID: 7003379
Filing Date: 2006-02-21
Classification: G05B

Abstract:
1. A limit cycle autotuning method of calculating a control parameter by alternately performing operation of outputting a predetermined heat-side manipulated variable set point to a heating actuator and operation of outputting a predetermined cool-side manipulated variable set point to a cooling actuator in a heat/cool control apparatus which performs temperature control by performing feedback control computation with respect to a deviation between a set point and a controlled variable on the basis of the control parameter, and properly switching a heat mode of outputting a manipulated variable to the heating actuator and a cool mode of outputting a manipulated variable to a cooling actuator, comprising: the first limit cycle generation step of generating a first limit cycle of alternately outputting the heat-side manipulated variable set point and the cool-side manipulated variable set point; the first control response detection step of detecting a first control response corresponding to the first limit cycle; the second limit cycle generation step of generating a second limit cycle by changing one of the heat-side manipulated variable set point and the cool-side manipulated variable set point on the basis of predetermined change instruction information for instructing which one of the heat-side manipulated variable set point and the cool-side manipulated variable set point is to be changed after the first limit cycle and a predetermined manipulated variable change ratio indicating a degree of the change; the second control response detection step of detecting a second control response corresponding to the second limit cycle; and the control parameter calculation step of calculating the control parameter for each of the heat mode and the cool mode on the basis of the detected first and second control responses.