Patent ID: 8923991

Claim:
A controlling device comprising: a transient operating quantity upper limit value storing portion that stores a transient quantity upper limit value OH s , that is effective at a time of a transient response due to a change in a set point SP; a steady operating quantity upper limit value storing portion that stores an operating quantity upper limit value OH g that is effective at a time of a steady operation; a setting value change detecting portion that detects a change in the set point SP; a transient response completion detecting portion that detects completion of a transient response in a process variable PV; an operating quantity upper limit value switching portion that sets the transient quantity upper limit value OH s as the operating quantity upper limit value OH that is used in control calculations in a transient response time band from a point in time of the change of the set point SP to a point in time of the completion of the transient response, and sets the operating quantity upper limit value OH g as the operating quantity upper limit value OH that is used in control calculations in a steady operation time band that is other than the transient response time band; and a control calculating portion that calculates a manipulated variable MV through a control calculation, with the set point SP and the process variable PV as inputs, performs an upper limit process for limiting the manipulated variable MV to no more than the operating quantity upper limit value OH, and outputs, to that which is controlled, the manipulated variable MV after the upper limit process.