| 摘要 |
An ignition timing control apparatus for an engine which is capable of accurately estimating an engine speed immediately following the engine coming into an acceleration condition thereby enhancing the accuracy of ignition timing control, and a faulty cylinder detecting apparatus for a multi-cylinder engine using a crank angle sensor which generates a limited number of pulses. The apparatus generates a signal which divides each ignition cycle into a first rotation angular interval where an engine speed variation is large and a second rotation angular interval where an engine speed variation is small. Corresponding first and second rotation time intervals are detected in response to the signal. In accordance with these angular intervals and time intervals, an acceleration correction is effected to estimate a second rotation angular interval in a next ignition cycle. In accordance with the estimated second rotation angular interval in the next ignition cycle, a timing for ignition signal generation is set thereby generating an ignition signal at the timing. A faulty cylinder is detected in accordance with the estimated first rotation time interval and the detected first rotation time interval. A faulty cylinder may be detected in accordance with computed first and second unit rotation time intervals.
|
