| 摘要 |
PROBLEM TO BE SOLVED: To accurately perform reduction agent addition control when a catalyst temperature decreases through accurate temperature detection of an exhaust purification catalyst separately installed at a plurality of locations on a vehicle.SOLUTION: A vehicle exhaust purification device comprises: a urea water injector 10 which injects urea water into an exhaust pipe 2 of a vehicle engine 1; a selective reduction type catalyst 12 arranged at a downstream side of the urea water injector 10; a second temperature sensor 36 which detects a catalyst temperature of the selective reduction type catalyst 12; and a urea water supply control unit 40 which controls operation of a urea water injection valve 10 on the basis of the catalyst temperature detected by the second temperature sensor 36. The selective reduction type catalyst 12 is separately installed at a plurality of locations on a vehicle in a manner that stores: a first catalyst carrier 31 and a second catalyst carrier 32 in a first casing 21; and a third catalyst carrier 33 in a second casing 22. The second temperature sensor 36 is installed in the second casing 22 and detects a temperature of exhaust passing through the third catalyst carrier 33 as the catalyst temperature. |
