IGNITION TIMING CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE

摘要

PURPOSE:To shorten the time to converge to a target manometric peak position and improve operability by correcting the target manometric peak position of the cylinder inner pressure to coincide with an average value of measured manometric peak positions and performing ignition timing control. 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 adjusts to advance or delay the previously set ignition angle in response to the difference between the manometric peak position data and its target data and sets a value obtained by subtracting an average value of manometric peak position data from the double of the target data to the new target data.