| 摘要 |
<p>PURPOSE:To suppress the fluctuation of process at the switching of selecting state, by providing a selecting state detecting section and making switching so that an integration time constant of a control section not selected can be decreased. CONSTITUTION:When an output control system is in waiting state, a voltage detector 34 detects the waiting state and a contact 35 is closed. At this state, when (V1-V2) is negative (where; V2 is a generator output detection signal and V1 is its set value) a diode 37 is forward-biased, and a vapor pressure valve 12 operates toward its input to closing direction by an integration time constant with a short time constant determined almost with a resistance of a resistor 36 and a capacitance of a capacitor 29. Thus, in this case, the control is transferred to an output control with an integration output V5 determined with a deviation between the V1 and V2. When the valve 12 is controlled with an output V5, an operational amplifier 21 for the selecting circuit returns immediately from a positive saturation value to a normal control value. The detector 34 detects the output change in this amplifier to open the contact 35. Thus, the valve 12 can immediately be controlled with the integration constant for control.</p> |
