| 摘要 |
This exhaust-gas purifying device purifies exhaust gas discharged from a gasoline engine (100) of a vehicle (GC) and flowing through an exhaust pipe (300). The exhaust-gas purifying device is provided with a purification functional section (10) and a detecting section (14). The purification functional section is provided in the exhaust pipe and has a three-way catalyst (11, 13) that oxidizes or deoxidizes a hazardous substance in the exhaust gas by means of a metallic catalyst (136), and also has a filter (12, 13) that allows the exhaust gas to pass therethrough so as to collect particulates. The detecting section is provided in the exhaust pipe at the downstream side of the purification functional section and has an electrical insulator (141) that causes the particulates to adhere thereto and a plurality of electrodes (142a, 142b) provided apart from each other. The detecting section detects the quantity of adhered particulates on the basis of the electrical conductivity between the plurality of electrodes. The detecting section is provided in an area distant from a downstream end (122, 132) of the purification functional section by 1 m or more with respect to the path length of the exhaust pipe, or in an area where the temperature of the exhaust gas flowing after the gasoline engine warms up is 450°C or lower. |
