| 摘要 |
The unit (5) has a single cell (21) detecting concentration of gas in exhaust gas, and a heating device (26) in form of a bar or a plate for heating the cell. A CPU (11) detects resistance of the cell. The CPU supplies power to the heating device. The CPU determines whether change in temperature of the exhaust gas flowing through an exhaust tube, occurs outside of a permissible region. The CPU corrects reference resistance, if the CPU determines whether the change in the temperature of the exhaust gas occurs outside of the permissible region. |
