Abstract A theoretical Investigation is conducted to examine the effect of the various parameters that influence the compression stroke of a direct injection diesel engine. A method has been developed for the thermodynamic determination of the engine TDC position based on a comparison between the theoretical and the measured compression pressure diagram. In addition information is obtained for the condition of the engine cylinder tightness through the blowby rate which determines the wear. The compression stroke is strongly influenced by, the initial conditions at the inlet valve closure, the heat exchange mechanism and the effective compression ratio of the engine. In most cases these values are not known, so that a method has been developed for their estimation by the present authors. The present work attempts to examine the influence of each parameter separately and determines the error introduced in the location of the TDC position and in the tightness of the engine cylinder. Errors in the calculation of the compression stroke of the engine, will also affect the predicted pressure diagram during the combustion/expansion period. A medium speed, direct injection marine diesel engine is used as a basis for an application. The results are encouraging and reveal the importance oinfluence of the parameters mentioned above on the compression pressure diagram of a direct injection diesel engine.
Kouremenos et al. (Sun,) studied this question.
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