| 摘要 |
PURPOSE:To obtain the optimum ignition time by carrying out sampling more than several ten times as the explosion frequencies of an engine and carrying out feedback of explosion frequencies so that the frequency of generation of knocking can be suppressed within several %. CONSTITUTION:An ignition advance calculating circuit 5 is connected with a standard angle detector 1, angular clock detector 2, intake pressure detector 3, and a knocking detector 4, and ignition time is determined according to the engine state. Corrected advance calculating circuits 5-10 calculate the rate of knocking in the fixed sampling frequencies of combustion cycle, and when knocking over the prescribed rate is detected, ignition time is delayed by a fixed angle, and when knocking under the prescribed rate is detected, ignition time is advanced by a fixed angle, and further, the prescribed value of the frequency of next sampling is reduced at the same time when the ignition time is varied. |
