| 摘要 |
PROBLEM TO BE SOLVED: To provide a control device for an internal combustion engine, for suppressing the worsening of fuel efficiency when executing rich spike to a plurality of cylinder groups all together.SOLUTION: The control device starts rich spike to both of two cylinder groups (banks 1, 2) at the same time (Step 110), calculates the amounts of reductant to be introduced into NSR catalysts connected to the respective banks when starting the rich spike (Step 120), determines whether a difference between the amounts of the reductant is small or not (Step 130), sets target air-fuel ratios of both of the banks to be the same value when determining that the difference between the amounts of the reductant does not exceed a threshold value (Step 140), and sets the target air-fuel ratios of the bank 1 and the bank 2 to be different values when determining that the difference between the amounts of the reductant exceeds the threshold value (Step 150). Thus, it finishes the rich spike to the bank 1 and the bank 2 at the same time. |
