| 摘要 |
PURPOSE:To compensate disturbance to a control system, drift in setting, etc., by converting the operation output of a digital controller into an analog signal, and adding this to the analog operation output of an analog controller. CONSTITUTION:A feedback control system consists of a controlled system 2, analog P controller 1A, and a digital I controller block. This digital I controller 3 consists of an AD converter 5, DA converter 8, coefficient multiplier 10, memories 6 and 7, etc., and the set value (command) rD of a controlled variable C is supplied as a digital value. Then, its deviation (e) from the converted value CD of a controlled variable C from the controlled system 2 which is obtained by an AD converter 5 is calculated and the integral value (digital value) of the deviation is derived from the output of the memory 6. This is converted by a DA converter 8 into an analog value, which is multiplied by an integral constant through the coefficient multiplier 10 and added to the output of said analog P controller 1A, thereby applying the sum of the controlled system 2. |
