| 摘要 |
An EGR controller for an internal combustion engine, which is capable of maintaining reduced exhaust emissions and excellent drivability while achieving the maximum effect of suppression of NOx generation. In the EGR controller, part of exhaust gases discharged into an exhaust passage is recirculated into an intake passage via a first EGR passage and a second EGR passage. Further, by controlling the degree of opening of an EGR control valve, the amount of exhaust gas recirculation is controlled. Further, the proportion of oxygen in intake air flowing through an EGR recirculation section of the intake passage which is downstream of the EGR control valve and upstream of a portion connected to the first EGR passage is obtained as a first oxygen proportion, and the degree of opening of the EGR control valve is controlled such that the first oxygen proportion becomes equal to a target oxygen proportion. |
