第7章 汽车发动机增压
《汽车构造》电子教案第七章车用发动机的增压系统第七章车用发动机的增压系统25/2/21哈尔滨工业大学(威海)第2页第一节概述所谓增压就是将空气预先压缩然后再供人气缸,以期提高空气密度、增加进气量的一项技术。由于进气量增加,可相应地增加循环供油量,从而增加发动机的升功率。同时,增压不仅可以改善燃油经济性,而且还作为控制排放的有效技术措施之一而得到广泛应用。实践证明,在小型汽车发动机上采用涡轮增压或机械增压后,当汽车以正常的经济车速行驶时,不仅可以获得良好的燃油经济性,而且还可以有效地降低有害排放物的比排放(单位功率小时的排放量)。同时,由于发动机功率增加,还可改善车辆的加速性。根据提高进气密...
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