An Investigation on Transient Rotational Speed of Internal Combustion Engines

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 n_c 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 n_c. 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.