| 摘要 |
PURPOSE:To prevent knocking with good response while improving fuel consumption and output by detecting combustion light to monitor the condition of combustion, and controlling ignition timing to be a condition that self-ignition takes place without being brought to knocking. CONSTITUTION:A combustion light signal is inputted into an optical filter 5 by means of an optical fiber 4 installed in a combustion chamber 3, and components peculiar to self-ignition and knocking combustion are selected, which are transduced into electric signals by a photo-detector 6. Among these signals, only components peculiar to knocking and self-ignition are sent to a knocking judging circuit 12 and a self-ignition judging circuit 13 through filters 10 and 11 respectively, from which components which are greater their respective reference voltages, are inputted into a control circuit 14 as a knocking or a self-ignition signal. The control circuit 14 carries out the lead angle of ignition timing until a self-ignition existing condition is detected. On the other hand, this lead angle control is stopped if a signal of knocking is inputted, immediately carrying out a lag angle by a certain quantity on the contrary.
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