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强化和提高升功率N_л过去是,现在仍然是内燃机发展的主要方向之一。为达此目的,或者借助于增加平均有效压力P_c,或者借助于提高转速n,或者两者同时并用。诚然,提高转速无助于提高发动机燃油经济性,无助于延长发动机寿命C和降低噪声。因此,增加升功率的基本潜力在于提高平均有效压力。从图1可以清楚地看出大型载重汽车发动机从1932年到1982年期间有关技术水平的广告指标的变化情况。
Strengthen and improve the power N_л N, the past, is still one of the main directions for the development of internal combustion engines. For this purpose, either by increasing the mean effective pressure P_c, or by increasing the speed n, or both. True, increasing speed does not help improve engine fuel economy, helping to extend engine life C and reduce noise. Therefore, the basic potential for increasing power output is to increase the average effective pressure. From Figure 1, we can clearly see the changes of the technical indicators of the advertisement of large-scale truck engines from 1932 to 1982.