| 摘要 |
<p>An ECU defines consecutively ignited three cylinders as first, second and third subject cylinders. The ECU first adds up the rotation fluctuation amount at the second subject cylinder and the rotation fluctuation amount at the third subject cylinder and sets the resultant as an added-up fluctuation amount. The ECU then determines whether the type of an occurring misfire is a single-cylinder misfire based on the added-up fluctuation amount. When the type of the occurring misfire is not a single-cylinder misfire, the ECU obtains the difference between the rotation fluctuation amount at the second subject cylinder and the rotation fluctuation amount at the third subject cylinder as a fluctuation amount deviation. Then, the ECU determines whether the type of the occurring misfire is a consecutive-two-cylinder misfire or an intermittent-two-cylinder misfire based on the fluctuation amount deviation. As a result, for any kind of a rotation fluctuation pattern caused by a misfire, the type of a misfire is accurately determined.</p> |
