| 摘要 |
A selective catalytic reduction (SCR) system capable of accurately detecting a liquid level even when a tank is inclined, an SCR sensor, and a level sensor are provided. This SCR system is equipped with a selective catalytic reduction device (3) that is disposed on an exhaust pipe (2) of an engine, an aqueous urea solution tank (4) that stores an aqueous urea solution, a float-type aqueous urea solution level sensor (25) that is disposed in the aqueous urea solution tank (4), a dosing valve (5) that is disposed on the exhaust pipe (2) on the upstream side of the selective catalytic reduction device (3), and an aqueous urea solution injection control section (30) that controls the injection amount of aqueous urea solution to be injected through the dosing valve (5) in accordance with an amount of NOx discharged from the engine. This SCR system is further equipped with: an inclination sensor (37) that detects an inclination angle of the aqueous urea solution tank (4) with respect to the horizontal plane; and an inclination angle correction processing section (38) that corrects a liquid level of the aqueous urea solution, said liquid level being detected by a detection means (20) from the position of a float (31), with the inclination angle detected by the inclination sensor (37). |
