| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide EGR control device for an internal combustion engine capable of suppressing clogging of an EGR passage accompanying the addition of fuel to an exhaust passage. <P>SOLUTION: When an accumulation amount of fuel Ti in the EGR passage 33 becomes a permission value or higher, setting of increase of a target EGR ratio Et is performed so as to become inclination of increase of the target EGR ratio Et than a usual time. By setting of the increase, the target EGR ratio Et is restrictively set to a larger value than the usual time and the EGR ratio of the internal combustion engine 10 is further enhanced than the usual time. As a result, since an amount of EGR gas flowing in the intake passage 12 is made much and evaporation of the fuel accumulated in the EGR passage 33 is promoted, the fuel accumulated in the EGR passage 33 becomes deposit and the same passage 33 can be suppressed from being clogged. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
