To make neither the stability nor the response of control spoiled by difference in the input interval of an input signal, by detecting the input interval of an input signal with respect to a specific quantity, and varying the control constant of control operation according to the interval and correcting a manipulated variable.
The input interval of the input signal with respect to a specific quantity is detected, and the control constant of control operation is varied according to the interval to correct the manipulated variable. Of this controller, a proportional and integral computing element 32 performs proportional and integral operation with a deviation signal 102 and outputs a steam adjusting value opening extent command 103. Characteristics of a function generator 40 which outputs the control constant 111 of the proportional and integral computing element 32 are so set that the control constant is large when the signal input interval is short and small when long. This function generator 40 supplies the control constant 111 of the proportional and integral computing element 32 with the characteristics, so when the manipulated variable of the steam adjusting valve opening extent command 103 can be made small when the signal input interval is long, and made large when short.
KAWAI TAKUMI
IMAHASHI HIROO
HITACHI ENG CO LTD
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