A Study on the Method for Deducing the Inertia Moment of an Engine

WT5”BZ] The inertia moment is an important parameter,for example,it is necessary for the on line rapid estimating power performance of engine that is based on the principle of inertia acceleration under no load.In this paper,some current method for determining the inertia moment of moving parts of engine are discussed and a new method——transient rotational speed method to deduce inertia moment is proposed,its principle is also presented.It deduces inertia moment by means of measured transient rotational speed and cylinder pressure under steady conditon and lower speed.This method is experimented at a model 185 diesel,the experimental results indicate that its accuracy is within 3%.Based on calculating and experimental results,the factors that influence measuring accuracy of the method are discussed and some improvements are proposed. [WT5”HZ]