Formula management in online monitoring for large diesel engine

The online monitoring system for large diesel engine, especially in a power plant, should be implemented in order to monitor the performance of diesel engine. In addition to the sensors planted in diesel engine, some performance indicators of diesel engine are represented in the form of formula. The formula is defined by the expert, and it utilizes the sensors reading from diesel engine. This paper discusses the formula management in online monitoring system for diesel engine that provides online recommendation for operators. The expert inputs the main knowledge, which is the formula and the recommendation if the formula value is outside the normal range. The input process is implemented in web based application. The formula calculation is carried out in a frame expert system implemented in CLIPS. Based on the calculation result, system will give recommendation if it requires some necessary action. The evaluation in this paper shows that parsing a text based formula into formula representation in CLIPS, while reading the sensors involved in the formula, has been successfully carried out. The proposed frame representation is designed in CLIPS. It automatically creates a formula calculation from text based formula that is parsed from database. The evaluation shows that the proposed formula management is properly working on the formula requested by the expert.