| 摘要 |
PURPOSE:To ensure the stable control for switch between a using system and a waiting system by giving correction to the operation signal in case each deviation between operation signals delivered from a multiplex control system is kept higher than a set level for a set period of time. CONSTITUTION:Each of controllers 6-8 of a multiplex control system contains a deviation operator 3 and a PI operator 5. The control is continued by switching a using system having a fault with another nondefective system. The operation signals having intermediate values are selected among those operation signals 5a-5c and delivered 10a through an intermediate value selecting circuit 10. Furthermore a deviation comparator 11 and a timer 12 are added. The selected intermediate value signal 10a is compared with the operation signal 5a by a deviation comparator 11. If the signal 10a is higher than a set level, a deviation signal 11a is delivered to start the counting action of the timer 12. When the signal 11a lasts longer than the set period of time and energized, a timer signal 12a is delivered. Then the operator 5 gives correction to the calculated signal 5a with the signal 10a and delivers it. |
