| 摘要 |
<p>An engine misfire diagnostic apparatus measures an amount of time required for a crankshaft to pass through a prescribed crank angle range corresponding to a combustion stroke to obtain time measurement values on a per cylinder basis. A first misfire parameter is obtained based on stored time measurement values from a designated cylinder, an opposing cylinder corresponding to one crankshaft rotation prior and the opposing cylinder corresponding to one crankshaft rotation later. A second misfire parameter is obtained based on stored time measurement values from the designated cylinder, a first reference cylinder whose ignition occurs one ignition prior to the designated cylinder's ignition and a second reference cylinder whose ignition occurs later than the designated cylinder's ignition, the differences weighted according to a prescribed ratio. A determination of whether the designated cylinder has misfired is based on the second misfire parameter and a derivative value of the first misfire parameter.</p> |
