| 摘要 |
PROBLEM TO BE SOLVED: To provide a failure diagnosis device for an internal combustion engine adapted to enhance its failure diagnosis accuracy for each cylinder. SOLUTION: An ECU, upon calculating a work volume equivalent value Sneflt (#k) for each cylinder (step S1), compares it with a determination threshold th1 (step S3), and if it is determined to be less than the determination threshold th1 (YES in step S3), performs continuation time calculation processing after normal return (step S4) to calculate continuation time Txr (#k) after normal return. Then, the ECU, if the continuation time Txr (#k) after normal return is a predetermined value or more, performs summation of an abnormal continuation time counter ecrhidl (#k) (step 6), and if the abnormal continuation time counter ecrhidl (#k) is determined to be two seconds or more (YES in step S9), turns on an abnormal cylinder flag exdcyl (#k) (step S10). COPYRIGHT: (C)2012,JPO&INPIT |
