| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an exhaust emission control device for a spark ignition type internal combustion engine, in an exhaust passage of which the exhaust emission control device including a particulate filter is arranged, for suppressing the excessive temperature rise of the particulate filter during decelerating operation after executing an increase in the amount of fuel to suppress the thermal deterioration of exhaust system components.SOLUTION: To solve the above issue, the exhaust emission control device for the spark ignition type internal combustion engine, in the exhaust passage of which the exhaust emission control device including the particulate filter is arranged, reduces the concentration of oxygen in exhaust gas flowing into the particulate filter during decelerating fuel-cut operation of the internal combustion engine when a time (an integrated time) is not shorter than a predetermined time for executing an increase in the amount of fuel to suppress the thermal deterioration of the exhaust system components, thereby reducing the oxidation speed of PMs trapped by the particulate filter.</p> |
