| 摘要 |
PURPOSE:To obtain a satisfactory control result regardless of the set value by using a correction coefficient serving as a function of the set value to control variably the parameters of the proportional element, the integral element and the differential element respectively. CONSTITUTION:A PID controller 10 consists of a preprocessing arithmetic part 11 which receives the process quantity P, a setting part 12, an adder 13 which obtains the deviation between the quantity P and the set value (r), the correction term parts 21-23 which produce the correction coefficients as the functions of the value (r), multipliers 14-16, the proportional, integral and differential elements 17-19 and an adder 20. The deviation output given from the adder 13 is multiplied by the correction coefficients given from the parts 21-23 through multipliers 14-16 respectively. Then the outputs e1-e3 of said multiplications are applied to elements 17-19 respectively. Thus an operating amount (y) obtained from the output of the adder 20 has an optimum parameter for each action. |
