A Study on CKP Signal Collection Algorithms for Knocking Identification and Development of Engine Diagnosis System in CRDI ECU

摘要

As an abnormal combustion caused by the compression and spontaneous ignition of unburned mixture during the latter process of combustion, if knocking occurs, it will result in loss of engine power as well as severe damage to engine. Therefore, it is very significant to monitor knocking. Generally, a practical method of monitoring knocking is to use a knocking sensor. However, by this method it is not possible to distinguish between engine's own vibrations and knocking if the vibrations match up with the range of the knocking sensor signal for the use of detection of knocking. In this study, knockking was diagnosed by way of using the signals of CKP sensor which is basically installed in the engine, instead of using such a problematic knocking sensor. Moreover, a mobile diagnostic system based on OBD-Ⅱ for industrial CRDI engine has been developed. Since the developed engine diagnosis system makes it possible for an administrator to monitor automotive information in real time wihtout any other equipment, the person may promptly respond to occurance of malfunction in engine.