| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a dissolved oxygen (DO) controller, capable of stabilizing the amount of dissolved oxygen in a waste water treatment tank. <P>SOLUTION: The DO controller 1 evaluates reference air quantity, by adding an air quantity set value calculated by a multiplier 2 to an air quantity correction value calculated by an integrator 8, and from the reference air quantity the DO controller obtains, for example, an air quantity deviation which is a control command value for controlling the air quantity of a blower. The air quantity correction value is changed, by using a DO deviation value, only when the integrated value of the absolute value of the DO deviation is K1, where the integrated value of the absolute value of the DO deviation is the absolute value of the deviation between the DO set value and the DO detected value. Hence, the DO deviation value affects the air quantity, only when the air quantity is changed, regardless of the DO deviation between the changing which enables on-off control of the DO value in the waste water treatment tank. Furthermore, since the air quantity correction value is changed based on the DO deviation value at the changing, the DO value can be corrected by taking into consideration the deviation of the DO value. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
