| 摘要 |
A misfire diagnosis apparatus for an internal combustion engine having a plurality of cylinders, comprising momentum change rate calculating device (M1), momentum change rate comparing device (M2), misfire judging device (M3) and average momentum change rate learning value setting device (M4). A momentum change rate calculated by the calculating device (M1) is compared with an average momentum change rate learning value by the comparing device (M2) in light of a learning value map (MMP(Delta)Nl) corresponding to the operating conditions of a pertinent cylinder. The result of the comparison is compared with a misfire judgement level by the judging device (M3) in light of a misfire judgement level map (MMP(Delta)NLEVEL) corresponding to the operating conditions of the pertinent cylinder. The setting device (M4) sets and updates the learning value of the learning value map (MMP(Delta)Nl).
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