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The starting knock of R4102 D.I. diesel engine are analyzed experimentally based on the transient speed and first and third cylinder indicator diagrams that were taken from updated data acquisition system developed by the authors[1][2]. The influence of the starting knock on the strength of connecting rod, piston and piston ring are also studied. The results show that the influence of the starting knock is larger than the influence of the rated conditions. So the starting knock must be thought in the engine design.

There arm two kinds of rotational speed changes in running of internal combustion engines - rotational speed fluctuation within each working cycle and rotational speed change of successive cycles. Application of transient rotational speed nφ of each crank angle and average rotational speed nc of any working cycle can rationally demonstrate the change of the rotational speed of I.C.E.. Conventional speed-measure instruments may not be used to measure nφ and nc. Therefore authors take work on this measuring technique. This paper introduces the measuring principle and instrument and analyses the accuracy of measure. The developed instrument has been used on 5 types of diesel engines, such as 6135, 6130Q, R4100, etc. Measured results at steady condition, low speed radomrunning, sudden loading, free acceleration and starting process are given in this paper.

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.