| 摘要 |
PROBLEM TO BE SOLVED: To provide an addition liquid supply device for an internal combustion engine that can prevent deterioration of addition liquid in an addition valve and an addition liquid passage due to exhaust gas.SOLUTION: An engine 1 includes: a tank 210 for storing urea water; an urea addition valve 230 for injecting urea water into an exhaust passage 26; an urea water passage 240 for supplying the urea water in the tank 210 to the urea addition valve 230; and a pump 220 provided in the middle of the urea water passage 240. After stop of the engine, an urea addition control device 90 executes recovery control for recovering the urea water in the urea addition valve 230 and the urea water passage 240 to the tank 210 by driving the pump 220 with the urea addition valve 230 opened. When a starter 29 is driven while the recovery control has not been completed, an engine control device 80 closes the urea addition valve 230 through the urea addition control device 90.SELECTED DRAWING: Figure 1 |
