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In this paper, the authors analyse the effect of combustion process upon the combustion noise and working stability of 6130Q D.I. diesel engine, and point out that the higher combustion noise is caused by excessive premixed combustion. In order to improve engine noise it is need to decrease the injection quantity in delay period. The fluctuation of working cycles is mainly effected by the injection pump rack shaking and auto-advancer oscillating. By improving the matching of spring rigidity and mass the working stability can be improved.

The authors measured and studied rack displacement pattern and injection advance angle of fuel pump on 6130Q diesel engine at both steady and speed change conditions. By means of injection pattern and indicator diagrams actually measured at the same time, this paper deals with the important roles of fluctuation of rack displacement and injection advance angle at steady condition and their dynamic response to operating stability, accelerability and combustion process of the diesel engine.