| 摘要 |
<P>PROBLEM TO BE SOLVED: To accurately determine existence or nonexistence of abnormality in a blow-by gas processing system used for an internal combustion engine including an EGR system. Ž<P>SOLUTION: This device is used for an internal combustion engine including an air-flow meter, an EGR system and a blow-by gas processing system. Real EGR rate is obtained based on the quantity of gas sucked into a combustion chamber of the internal combustion engine and a detection valve of the air-flow meter, and target EGR rate is obtained based on the operating condition of the internal combustion engine, and feedback control of EGR opening VR is performed so that the real EGR rate and the target EGR rate coincide with each other. A reference opening VB about EGR opening VR is obtained based on the operating condition of the internal combustion engine (S202), and existence of abnormality in the blow-by gas processing system is determined based on the relation between the reference opening VB and the EGR opening VR (S203-S205). Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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