Patent ID: 8108057

Claim:
A control system for a plant, said control system comprising: feedback control means for calculating a feedback control input so that a controlled output of said plant coincides with a target value; averaging means for averaging the feedback control input to calculate an averaged feedback control input; hold control input calculating means for calculating a hold control input according to an operating condition of said plant; corrected hold control input calculating means for calculating a corrected hold control input by combining the hold control input with the averaged feedback control input according to a preset ratio; and control input setting means for setting a control input to said plant to the feedback control input in a first state where a control deviation between the controlled output and the target value is greater than a predetermined threshold value, and setting the control input to the corrected hold control input in a second state where the control deviation is equal to or less than the predetermined threshold value, wherein the feedback control means is also for making the feedback control input gradually approach to or coincide with the corrected hold control input in the second state.