PURPOSE: To improve stability in a stationary state, and also, to allow quick responsibility of a transient response and the stability at a stationary time to coexist with each other. ;CONSTITUTION: An integrator 12 and a linear amplifier 14 of a PI controller 1 of a control system are provided in parallel, and to a pre-stage of this integrator 12, a deviation gain variable function device 11 for delaying extremely an integral time constant at the time when a deviation voltage (e) is small is connected. Also, to a pre-stage of the linear amplifier 14, a deviation hysteresis function device 13 for setting proportional gain to zero at the time when the deviation voltage is small is connected, and stable control is executed by a slow integral time constant at a stationary time when the deviation voltage (e) is small without spoiling quick responsibility at a transient time when the deviation voltage (e) is large.;COPYRIGHT: (C)1993,JPO&Japio
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