| 摘要 |
An exhaust gas purification apparatus for an internal combustion engine is provided. An exhaust purifying catalyst is provided in an exhaust passage (12) for the engine and a fuel adding valve (15) is provided in the exhaust passage (12) at a position upstream of the exhaust purifying catalyst. The exhaust gas purification apparatus includes anti-clog means for causing the fuel adding valve (15) to perform anti-clog fuel addition for injecting fuel to prevent clogging of the fuel adding valve (15), the exhaust gas purification apparatus is characterized in that the exhaust gas purification apparatus comprises:
catalyst activation estimation means for estimating if the exhaust purifying catalyst is in an activated state or not;
wherein, in a situation where the anti-clog fuel addition should be conducted, if the catalyst activation estimation means estimates that the exhaust purifying catalyst has not been activated, the anti-clog means performs reduction control in which a fuel addition amount per unit time is restricted or the anti-clog fuel addition is prohibited until the exhaust purifying catalyst is activated. |
