| 摘要 |
<P>PROBLEM TO BE SOLVED: To accurately determine the misfire of an internal combustion engine having a control device even when the warmup of the control device is promoted or the warmup is completed. <P>SOLUTION: When a catalyst warmup promoting control is not performed, a misfire is determined by classifying the groups of intermittent misfire, single misfire, and continuous misfire by comparing the 30° required time T30 calculated as the time required for a crankshaft to rotate by 30° with thresholds Tref1 and Tref2 (S120 to S150). When the catalyst warmup promoting control is performed, the misfire is determined by classifying the groups of continuous misfire, and intermittent misfire by comparing the 30° required time T30 calculated as the time required for a crankshaft to rotate by 30° with thresholds Tref3 and Tref4 (S160 to S190). Consequently, the misfire of the engine can be accurately determined irrespective of whether the catalyst warmup promoting control is performed or not. <P>COPYRIGHT: (C)2007,JPO&INPIT |
