IGNITION TIMING CONTROLLER FOR INTERNAL COMBUSTION ENGINE

摘要

PURPOSE:To prevent overdelayed timing or the like in an abruptly changed running condition of an engine by calculating the instant lower limit value of delayed timing amount from the lower limit value of delayed timing obtained according to the running condition and a learning value to correct said lower limit value and limiting the corrected delayed timing with said instant lower limit value. CONSTITUTION:A basic ignition timing calculating means A for calculating the basic ignition timing according to the running condition of an engine, a delayed timing lower limit value calculating means B for calculating the delayed timing lower limit value according to the running condition of engine and a delayed timing correction amount calculating means C for calculating the delayed timing correction amount according to the presence of knocking are provided. Also, a learning value renewing means D for renewing the learning value to correct said delayed timing lower limit value and a delayed timing instant lower limit value calculating means E for calculating the delayed timing instant lower limit value from the learning value and the delayed timing amount lower limit value are provided. A delayed timing correction value is limited by the delayed timing instant lower limit value by a delayed timing correction amount limiting means F and the basic ignition timing is corrected according to the limited delayed timing correction amount by an ignition timing correction means G to control the ignition timing.