| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust emission control device of an internal combustion engine which inhibits deposit generation in an addition valve for adding a reducer.SOLUTION: An engine 1 is provided with: an SCR catalyst 41 which receives the supply of urea water and thereby purifies an exhaust air; a urea water supply mechanism 200 which supplies the urea water to an urea addition valve 230 and recovers the urea water from the urea addition valve 230; and a control unit 80 which controls the operation of the urea water supply mechanism 200. The control unit 80 estimates a temperature of the urea addition valve 230 and performs processing for injecting the urea water into the urea addition valve 230 when the estimated temperature of the urea addition valve 230 is higher or equal to a boiling temperature of the urea water. |
