| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust emission control system for an internal combustion engine, capable of eliminating deterioration in emission cleaning efficiency caused by deviation from true values, which is a problem inherent to integrated value control, and to save labor to reset.SOLUTION: The exhaust emission control system 25 for the internal combustion engine is provided with: a catalyst 13, arranged in an exhaust passage 6 of the internal combustion engine 1, for cleaning exhaust gas; a reactant supply device 30, arranged at an upstream side of the catalyst 13, for supplying a reactant 12 necessary for reaction of the catalyst 13; and a control device 24 for controlling a supply quantity of the reactant by the reactant supply device. The control device 24 executes a step S2 for calculating a basic reactant supply quantity on the basis of an operation state of an internal combustion engine, a step S4 for calculating a correction quantity Nc for the basic reactant supply quantity on the basis of an operation state of the internal combustion engine, and a step S5 for calculating a target reactant supply quantity on the basis of the basic reactant supply quantity and the correction quantity. |
