| 摘要 |
A particulate matter sensor includes a detection filter, a differential pressure detecting unit, an on-off valve, and a valve control unit. The detection filter is installed in an exhaust passage connected to an internal combustion engine and is configured to detect particulate matter contained in an exhaust gas passing through the exhaust passage. The differential pressure detecting unit is configured to detect a pressure difference between an upstream side and a downstream side of the detection filter. The on-off valve is installed on the upstream side of the detection filter in the exhaust passage and is configured to control a flow of the exhaust gas toward the detection filter. The valve control unit is configured to control the on-off valve to be opened and closed.
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