| 摘要 |
PURPOSE:To ensure the optimum control state even under the working of a process, by using the sample value control constant which is obtained by switching the sample value PID system to the sample value on/off system when the process dynamic properties are identified under the control. CONSTITUTION:In the normal mode, the output signal of a sample value PID control arithmetic part 5 passes through a switch part 7 and is fed to a sample holding part 2. Thus the operation signal is obtained to give the control to a process 1. While in the identification mode, the part 7 is switched to the side of a sample value on/off control arithmetic part 6. Then the operation signal of the process 1 is obtained by supplying the output signal to the part 2. Thus the sample on/off control is carried out in the identification mode, and the sample value PID constant Kc, Ti and Td are calculated from the output of the part 6 or 7 and the process signal y(t) via a sampler 8. This operation is performed at a pulse transmission function identifying part 9, a transmission function arithmetic part 10 and a sample value control constant arithmetic part 11. |
