Knocking detector for internal combustion engine

Abstract

Abstract PURPOSE:To make an easy and accurate detection for a knocking by providing a temperature detecting sensor in a combustion chamber and a knocking detection circuit wherein an amplitude, changing portion for the time, generation timing, etc., of the sensor output pulse are compared with the limit values. CONSTITUTION:The sensor provided with a black body radiation substance 13 at the tip of a heat resistant light transmitting body 12 in rod shape is al lowed to pierce through a wall part 10 of cylinder head to protrude the tip into the combustion chamber 11. An optical connector 16 is attached with screw to a holding component 14 of the transmitting body 12 and optically connected to an optical fiber 17. Then, an optical energy generated by the radiation body 13 in accordance with a combustion gas temperature is propagated to the trans mitting body 12 and fiber 17, and detected by a photodetector 21. The amplitude, changing portion of the unit time and generation timing, of output pulse from the detector 21 are made larger and faster at the time when the knocking is generated, than those at the normal working time; thereby, the easy and accurate detection for the knocking can be made by means of comparing these outputs with the reference limit values.

Inventors

• 👤 Shunsuke Kubota
• 👤 俊輔 久保田
• 👤 Hiroshi Maru
• 👤 丸　寛

Bibliographic Details