| 摘要 |
PURPOSE:To eliminate the effect of a misfire and correctly perform ignition angle control by detecting a misfire occurrence and ignoring the said data for this cycle when the manometric peak position data value of the cylinder inner pressure is near the top dead point position. CONSTITUTION:An ignition angle setting circuit 8 setting an ignition angle based on a manometric peak position data signal from a peak holding circuit 4 fed with output signals of a manometric signal generating circuit 1 generating a manometric signal indicating the cylinder inner pressure and a reference position signal generating circuit 3 is provided. An ignition switch SW is controlled to be closed by an ignition directing circuit 9 when the set ignition angle coincides with the present crank angle obtained by counting clock pulses from a clock generating circuit 2. The said ignition angle setting circuit 8 detects a misfire when the difference between the manometric peak position data signal value and the top dead point position data value is a predetermined value or less, and the manometric peak position data for this cycle is ignored. |
