REDUCING AGENT SUPPLY DEVICE

摘要

A reducing agent supply device includes a tank, an adding valve, a pump, and an electronic control unit. The adding valve is configured to receive the reducing agent supplied from the tank and inject the reducing agent. The pump is configured to send the reducing agent from the tank and suction the reducing agent back into the tank. The electronic control unit is configured to open the adding valve and suction the reducing agent back into the tank as a purge control when the internal combustion engine is commanded to stop. The electronic control unit is configured to increase an amount of a return suction of the reducing agent during the purge control as an amount of the reducing agent, remaining in a supply path and the adding valve when the stop command is given, increases.

主权项

1. A reducing agent supply device comprising:
a tank configured to accommodate a reducing agent; an adding valve configured to receive the reducing agent supplied from the tank via a supply path and inject the reducing agent into an exhaust passage of an internal combustion engine; a pump configured to send the reducing agent from the tank to the supply path and return the reducing agent back into the tank from the supply path; and an electronic control unit is configured to include a purge control that opens the adding valve and returns the reducing agent back into the tank from the supply path by controlling the pump when the internal combustion engine is commanded to stop, the electronic control unit being configured to increase an amount of a return suction of the reducing agent during the purge control as an amount of the reducing agent, remaining in the supply path and in the adding valve when the stop command is given, increases.