Patent ID: 9098078
Filing Date: 2015-08-04
Classification: G05B

Abstract:
1. A method of adjusting a process variable of a controlled object using a controller, the process variable being responsive to a change of an output of the controller, the method comprising: determining values of one or more predetermined model parameters of the controlled object, the predetermined model parameters being characteristic of response of the process variable to the change of the output of the controller; determining a steady-state output value of the controller at least partially based on a set-point value of the process variable and at least one of the one or more predetermined model parameters, wherein the process variable approaches the set-point value of the process variable in response to the output of the controller changing to the steady-state output value of the controller; determining the output value of the controller from a linear function of the steady-state output value; setting the output of the controller to the determined output value; wherein the values of one or more predetermined model parameters of the controlled object are determined from a response of the process variable to a step change of the output of the controller; wherein the values of one or more predetermined model parameters of the controlled object are determined from the response of the process variable to the step change of the output of the controller using values of the process variable at two time points during the response; wherein one of the time points is when the process variable is 0.38 times of a steady-state value of the process variable after the step change.