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众所周知,对于内燃机,Pi和η_i是衡量内燃机工作性能的重要参数,习惯上把P_i称作平均指示压力。因P_i×V_n=W_i,所以P的实际物理意义是表示单位气缸工作容积中的指示功。P_i是从实际的物理循环角度来标志发动机气缸工作容积利用率高低的一个参数。P_i值愈高,同样大小的工作容积将发出更大的指示功,气缸工作容积的利用程度越高。η_i的提高不仅可改善动力性能,也同样改善了经济性能,它表示燃料能量的利用率。但内燃机对最高指示压力Pz是限制的。因
It is known that for internal combustion engines, Pi and η_i are important parameters for measuring the operating performance of an internal combustion engine, and P_i is conventionally referred to as the average indicated pressure. Since P_i × V_n = W_i, the actual physical meaning of P is indicative of work per unit cylinder volume. P_i is a parameter that marks the utilization ratio of the cylinder working volume from the actual physical cycle angle. The higher the P_i value, the larger the working volume of the same size will be, and the higher the working volume of the cylinder. The improvement of η_i can not only improve the dynamic performance, but also improve the economic performance. It represents the utilization of fuel energy. However, the internal combustion engine is limited in its maximum indication pressure Pz. because