| 摘要 |
<p>PURPOSE:To economically operate an exhaust gas treating device by increasing a set value by a specified value when the flow rate of the exhaust gas from an exhaust gas source is rapidly changed, and changing the set value in conformity to the exhaust gas flow rate. CONSTITUTION:As the flow rate of the exhaust gas from an exhaust gas source 1 is stepwise increased, the detection value of an exhaust gas flow rate detector 8 is stepwise increased, and the detection value is inputted to an adder 24. The output of the detector 8 is inputted to a rate-of-change limiter 20 and a subtracter 21, and the output of the limiter 20 is inputted to the subtracter 21. Since the output of the limiter 21 is gradually increased, a positive value is outputted from the subtracter 21. As the output of the subtracter 21 is inputted to a limiter 22 for the upper and lower limits of signals, the upper-limit value is outputted from the limiter 22 to the adder 24 as the set incremental signal of an exhaust gas treating system. By this method, the deviation of the harmful gas concn. from the control value is prevented.</p> |
