| 摘要 |
PURPOSE:To determine the abnormality of an EGR device quickly and precisely, by comparing a learning correction quantity in a predetermined operational region with a learning correction quantity in any regions other than the predetermined operational region, and determining the abnormality of the EGR device according to the result of comparison. CONSTITUTION:During operation of an internal combustion engine EG, a fuel injection device C1 calculates an air-fuel ratio correction quantity according to an intake pipe pressure so as to make a composition of exhaust gas from the internal combustion engine EG be a predetermined composition, and also calculates a learning correction quantity for learning the air-fuel ratio correction quantity, then correcting a basic fuel quantity according to both the correction quantities. When the internal combustion engine EG is in a predetermined operational region, a part of the exhaust gas is returned to an intake pipe by an exhaust gas recirculation device C2. A comparing means C3 compares the learning correction quantity calculated in the predetermined operational region with the learning correction quantity calculated in any regions other than the predetermined operational region. Then, an abnormality determining device C4 determines abnormality of the exhaust gas recirculation device C2 according to the result of comparison, and drives an alarm means. |
