Reducing agent supplying device for vehicle, has filling device controlling pressure in phase section of tank, and control device controlling extracting device and filling device in accordance with operating condition of machine

摘要

The device (1) has a tank (2) for storing a liquid reducing agent, and a supply pump (3) sucking the reducing agent from the tank and supplies the reducing agent to an exhaust gas. An air pump (21) is provided for supplying air into a gaseous phase section, and a valve device (22) opens/closes a gaseous phase section to an environment. A filling device controls pressure in the phase section of the tank to fill the reducing agent inside the supply pump. A control device (10) controls an extracting device and the filling device in accordance with an operating condition of a machine.