| 摘要 |
PURPOSE:To improve the diagnosing capacity, by applying the input, output and integration output of a proportion and integration controller of a control system and then using a circuit having an OR function to discriminate a fault of a proportion gain from that of integration output with a fault diagnosing device. CONSTITUTION:A control system detects 2 a control subject 1 and then performs an operation 7 with a switch 6 between automatic and manual operations after a proportion and integration (PI) control 5. The input 28 and output 29 of the PI controller 5 are fetched into a fault diagnosing device 11 together with the output 30 of an integrator. When the proportion gain of the controller 5 has a deviation to an internal model of the device 11, a difference is produced between the output of an operator 12 and that of the controller 5. Then a fault is diagnosed 13 and decided 20 and then displayed 21. When the proportion gain has no fault, a fault is diagnosed 19 and discriminated 20 from operations 16 and 18 of the input 28 and output 30. This fault is then displayed 21. As a result, the fault diagnosing capacity is improved. At the same time, it is possible to discriminate the fault of the proportion gain of the controller 5 from that of the integrator. |
