Development of the knocking decision system using the CKP signal collection and analysis Online publication date: Thu, 04-Dec-2014
by Hwa-seon Kim; Seong-jin Jang; Jong-wook Jang
International Journal of Security and Networks (IJSN), Vol. 9, No. 4, 2014
Abstract: Diesel knocking occurs due to explosive combustion caused by a considerable amount of vaporised fuel resulting from lengthened ignition lag. Occurrence of knocking brings on engine power loss and severe engine damage, so it is necessary to diagnose and control knocking. Generally, a practical method of monitoring knocking is to use a knocking sensor. It is said that such a use of knocking sensor is convenient and highly accurate, but if the internal/external automotive environment and engine condition are not favourable, the method always has potential problems such as engine power reduction and low fuel efficiency that could occur due to ignition lag caused by excessive detection of knocking. Therefore, in this study, the signals of crankshaft position (CKP) sensor which is basically installed in the engine were used to diagnose knocking. Also, a method of collecting CKP signals was presented and knocking was diagnosed by way of using the angular velocity of crank.
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