籍助于 S/D 的变化对发动机机械损失和热损失影响的研究成果,我们可以确定效率指标和 S/D 变化之间的函数关系。本文和文献一样,假设内燃机有效功率相同,在 D=常数、C_m=常数或 V_h=常数、n=常数两种情况下改变 S/D。发动机的有效效率是评价其工作循环的完善程度、各系统及机构的工作情况的基本指标,它由下式确定: By researching the effects of S / D changes on engine mechanical losses and heat losses, we can determine the functional relationship between efficiency indicators and S / D variation. As in the literature, assuming that the internal combustion engine has the same effective power, the S / D is changed at both D = constant, C_m = constant or V_h = constant and n = constant. The effective efficiency of the engine is to evaluate the perfection of the work cycle, the basic indicators of the work of each system and institution, which is determined by the following formula: