基本放热规律已通过对许多二冲程与四冲程的中小型(12吋径～3.4吋径)发动机在不同功率、转速与空气供给条件下的示功图的分析而求得。本文应用一简单而广泛使用的模拟气缸条件的单区模型(Single Zone model)对早先试图为适用于计算机作性能计算的放热简单公式提供了说明。结论指出应用这方法固然可进行有用的计算,但为更好了解发动机条件,还需更多成熟的模型。 The basic exotherm has been derived from the analysis of the kinetic plots for a number of small and medium size (12 “to 3.4”) two and four stroke engines with different power, speed and air supply. A simple and widely used Single Zone model for simulating cylinder conditions is provided in this paper to illustrate the earlier attempts to simplify the exothermic equations for computer performance calculations. The conclusion points out that although this method can be used to make useful calculations, more mature models are needed to better understand the engine conditions.