| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a control device for a reducing agent supply device, a recovery method of a reducing agent and an exhaust emission control device, capable of preventing leakage of the reducing agent in an exhaust pipe along with execution of recovery control of the reducing agent within a reducing agent supply path. <P>SOLUTION: The control device for the reducing agent supply device for controlling the reducing agent supply device having a reducing agent recovery means for recovering the reducing agent within the reducing agent supply path in the exhaust emission control device, for adding the reducing agent to an exhaust gas upstream side of a reduction catalyst arranged in an exhaust passage of an internal combustion engine, and reducing and removing nitrogen oxides in exhaust gas by the reduction catalyst, is provided with a stop detection part for detecting that the internal combustion engine is stopped, a reducing agent recovery means control part for starting recovery of the reducing agent within the reducing agent supply path when the internal combustion engine is stopped, and an injection valve control part for closing a reducing agent injection valve at start of the operation of the reducing agent recovery means and opening the reducing agent injection valve after predetermined time passes. <P>COPYRIGHT: (C)2009,JPO&INPIT |
