| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology for detecting leakage of reducing agent in reducing agent feeding mechanism and prevent the reducing agent from wasting therewith, in the exhaust gas purifying device of an internal combustion engine equipped with the reducing agent feeding mechanism. SOLUTION: The exhaust gas purifying device of internal combustion engine provides an internal combustion engine of lean burn type 1, an exhaust gas purifying catalyst 20, reducing agent feeding mechanisms 28, 29, 30, 31, a means for detecting the reducing agent pressure 32 for detecting the reducing agent pressure of the region between a flow-regulation valve 30 in reducing agent feeding mechanisms 28, 29, 30, 31 and a shut-off valve 31 and a means for determining abnormality 35 for determining that the detected value of the means for detecting the reducing agent pressure is not greater than the pressure determined and that the reducing agent leaks from the reducing agent feeding mechanisms 28, 29, 30, 31, when the shut-off valve 31 is in the closed valve condition and the flow regulating valve 30 is in the closed valve condition. |
