| 摘要 |
There is provided a particulate matter (PM) sensor which can detect an average PM deposit quantity of the entire DPF and at the same time can ensure a capacitance large enough for detection. A DPF 1 obtained by vertically and horizontally stacking cells in which all of vertical and horizontal sides are surrounded by walls 2 formed of a porous material and sealing end faces of the cells 3 alternately vertically and horizontally is provided with first and second electrodes 5 and 6, and in a PM sensor 4 in which a PM deposit quantity of the DPF 1 is detected by a capacitance of a capacitor formed by the first and second electrodes 5 and 6, among open cells 3b, the first electrodes 5 are inserted into the open cells 3b arranged in a line in the diagonal direction, and the second electrodes 6 are inserted into the open cells 3b arranged in a line in the diagonal direction and including the open cells 3b secondarily adjacent to each of the open cells 3b into which the first electrodes 5 are inserted. |
