| 摘要 |
PURPOSE:To obtain a signal with high reliability to be independent of the fluctuation of the temperature and humidity of a circumference, the secular change fluctuation of a sensor, etc., by detecting the degree of odor from the degree of the increase of a gas sensor output after the action completion of a deodorizer. CONSTITUTION:A deodorizer 18 is operated for a time t1 in the degree of 10min - 2 hour, and a deodorizing processing is executed. Next, a sensor output Vc in the vicinity of the stoppage time of the deodorizer 18 is stored as V0. For a time t2 in the degree of 20min - 2 hour from the stoppage of the deodorizer 18, the increase of the sensor output Vc is monitored, and the degree of the odor is obtained. From an increase rate X of the sensor output after the stoppage of the deodorizer 18, the start threshold of the deodorization at the next time is specified. For example, for a threshold Vstd, Vstd=Vm+B.X (Vm is sensor output when t2 passes) is realized. Here, B is a positive constant, and it corresponds to the fact that the permissible width B.X is obtained wide as the odor is low. The method for specifying the permissible width is arbitrary, of course. The decision of Vstd may be good when it specifies the permissible width as the increase function of X. |
