| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent the deterioration of detection accuracy, and to obtain a stable sensor output, in a particulate matter detection sensor of an electric resistance type used for detecting PMs in exhaust gas. <P>SOLUTION: A gas sensor element 10 of the PM sensor 1 attached to an exhaust pipe EX of an engine E/G is constituted by laminating a heater 300 on a detection part 100 having detection electrodes 11, 12. A control circuit 2 executes starting combustion control for holding a temperature of the detection part 100 at a temperature T1 at which the particulate matter PM can be burnt for a preset time S1 by carrying electricity to the heater 300 at start-up, after that, performs normal control, and prevents wrong detection caused by the residue of the particulate matter PM. <P>COPYRIGHT: (C)2012,JPO&INPIT |
