Knocking detecting unit for internal combustion engine

Abstract

Abstract PURPOSE: To make it possible to detect weak knocking, by providing plural filters to detect knocking and by detecting the level of a vibration noise itself and by switching filters so that the characteristic may match to the filter region. CONSTITUTION: The reference angle position of the crankshaft of an engine is detected by angle position detector 1 and is shaped in 2. The base lead angle set previously is operated according to the state of the engine by base lead angle operating circuit 3, and an ignition time is determined in ignition lead angle operating circuit 4 on the basis of the output of operating circuit 3 and the output of correction lead angle operating circuit 5. The output signal of operating circuit 4 is supplied or cut off to the ignition coil by known igniter 6. Though the knocking phenomenon of the engine is detected by knocking detector 7, the characteristic of plural frequency bands is given to filter circuit 8 where this signal is input, and knocking is decided by knocking detecting circuit 9. At this time, the filter characteristic of filter circuit 8 is switched by filter control circuit 11. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Kimiaki Yamaguchi
• 👤 Tadashi Hattori
• 👤 Yoshinori Otsuka

Bibliographic Details