Engine control system

摘要

In an internal combustion engine, a spark timing control device adjusts spark timing in accordance with detected value of vibration in combustion pressure. A sensor detects vibration in combustion pressure within the engine. The detected combustion pressure vibration is converted into a correlation value relating to combustion condition of the engine. The current correlation value is compared to a reference value corresponding to the correlation value which was obtained during idling operation of the engine. This comparison is to determine whether or not a malfunction of the spark timing control device occurs. The spark timing is controlled in accordance with the detected combustion pressure vibration and also with the determination as to whether or not a malfunction of the spark timing control device occurs.