| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a gas concentration humidity detection device capable of detecting accurately a humidity when detection gas is the atmosphere, by a simple device constitution using a gas sensor. <P>SOLUTION: A sensor control device 3 has a whole domain gas sensor including an oxygen concentration detection cell having a pair of electrodes 21, 22, and an oxygen pump cell having a pair of electrodes 19, 20. In an electric circuit part 30, an Ip current flowing between the electrodes 19, 20 is controlled so that an electromotive force Vs generated between the electrodes 21, 22 is served as a reference voltage. The reference voltage is set as a first reference voltage, and is set, on the other hand, as a second reference voltage when the detection gas is the atmosphere. A humidity of the detection gas is detected based on an error ΔIp between an Ip current detected in the controlled state by the first reference voltage and an Ip current detected in the controlled state by the second reference voltage. <P>COPYRIGHT: (C)2011,JPO&INPIT |
