| 摘要 |
PROBLEM TO BE SOLVED: To provide a reducing agent supply device that can inhibit an urea water solution in a storage tank from being sucked into a pump side caused by a temperature decline after recovery control of a reducing agent.SOLUTION: A reducing agent supply device includes: a storage tank; a pump; an injection valve; a first supply passage leading from the pump to the injection valve; a second supply passage leading from the storage tank to the pump; a control device that executes control for injecting the reducing agent during an operation of an internal combustion engine and executes control for recovering the reducing agent remaining to the storage tank at stop of the internal combustion engine; and a temperature sensitive on-off valve that has a temperature sensitive body sensitive to a temperature and a valve element fixed to the temperature sensitive body. When the temperature is less than a predetermined temperature, the temperature sensitive body is deformed and the valve element is moved in the direction for closing the second supply passage.SELECTED DRAWING: Figure 2 |
