INTERNAL COMBUSTION ENGINE AND VEHICLE MOUNTING IT AND METHOD FOR JUDGING MISFIRE OF INTERNAL COMBUSTION ENGINE

摘要

The internal combustion engine system makes detection on the occurrence or the non-occurrence of a misfire by comparing the 240-degree difference TD240 of the 30-degree rotation time T30(CA) with the tentative detection reference value A1 and comparing the detection base difference ratios J1 and J5 with the ranges of the respective reference values B11, B12, B51 and B52 when the exhaust gas recirculation is performed, in addition to the methodology in the non-performance of the exhaust gas recirculation, that is, in addition to the methodology of comparing the 360-degree difference TD360 of the 30-degree rotation time T30(CA) with the tentative detection reference value A1 and comparing the detection base difference ratios J0, J2 and J4 with the ranges of the respective reference values B01, B02, B21, B22, B41 and B42 (S410, S440). This arrangement enables to detect a misfire in any of cylinders of the engine 22 accurately even when the exhaust gas recirculation is performed or not performed.