| 摘要 |
<p>PURPOSE:To rationalize the concn. of dissolved oxygen of an aeration tank, by mounting a parameter determinging operator for determining the parameter of a control system to a linear dissolved oxygen concn. model corresponding to a preset control response characteristic. CONSTITUTION:A dissolved oxygen concn. detector 4 and a thermometer 5 are provided in an aeration tank 1 and an airflow meter 6 is provided to the air blowing pipe in an emitting side. Process amounts x, theta, u detected by these meters are inputted to an electronic calculator 8 through an input apparatus 7 and operation is performed according to a preliminarily mounted program and an air blowing objective value u* is calculated to be outputted as the operation input signal of a blower through an output apparatus 9. The number control order N* of the blower 2 is outputted to a control apparatus and the opening degree order alphaA* of a suction valve 13 to an opening degree control apparatus 11 while the opening degree order alphaB* of an aeration air amount valve 14 to an opening degree control apparatus 12 to control an air blowing amount (u).</p> |
