本文通过对四冲程发动机作功循环表与配气相位关系的深入分析,指出了怎样运用基础理论进行故障分析,从而达到理论与实践相结合的目的。 In this paper, through deep analysis of the relationship between work cycle table and gas distribution phase of four-stroke engine, this paper points out how to use the basic theory to carry on the fault analysis so as to achieve the goal of combining theory with practice.