发动机原理04-增压教案资料

1、发动机原理04-增压 School of Automotive Studies Tongji University 发动机是靠燃料在汽缸内燃烧作功来产生功率的。对于动力性能一定的发动机，要提高发动机的功率一般只能通过喷入更多的燃料。但是燃料燃烧过程又必需有相应的空气量。所以发动机功率的提高受到进气量的直接影响。 增压器就是装在发动机上的专用增压装置，其工作原理是通过增压装置压缩进入气缸的空气，以提高进入气缸中的充气密度，增加进气量，这样就可以喷入较多的燃料进行燃烧，发动机就能发出更大的功率。 在目前的技术条件下，增压器是惟一能使发动机在工作效率不变的情况下增加输出功率的机械装置。 nKnlHn

2、pPsmat icsmcuat imeL113013010mitumitKHbe26106 . 3 School of Automotive Studies Tongji University School of Automotive Studies Tongji University School of Automotive Studies Tongji University School of Automotive Studies Tongji University School of Automotive Studies Tongji University School of Autom

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5、得到符合增压要求的增压器的压比，可以此为依据去选择最为合适的增压器 School of Automotive Studies Tongji University School of Automotive Studies Tongji University School of Automotive Studies Tongji University School of Automotive Studies Tongji University School of Automotive Studies Tongji University School of Automotive Studies To

6、ngji University 一、二冲程汽油机工作原理一、二冲程汽油机工作原理1-进气孔进气孔 2-排气孔排气孔 3-扫气孔扫气孔A图、图、活塞向上运动，将三排孔都关闭，活塞上部开始压缩活塞向上运动，将三排孔都关闭，活塞上部开始压缩 B B图、当活塞继续上行时，活塞下方打开了进气孔，可燃混合气进图、当活塞继续上行时，活塞下方打开了进气孔，可燃混合气进入曲轴箱入曲轴箱C C图、接近上止点时，火花塞点燃混合气，气体燃烧膨胀，推动活图、接近上止点时，火花塞点燃混合气，气体燃烧膨胀，推动活塞向下运动，进气孔关闭，曲轴箱内的混合气受到压缩塞向下运动，进气孔关闭，曲轴箱内的混合气受到压缩D D图、当活塞接近下止点时，排气孔打开，排出废气，活塞再向下图、当活塞接近下止点时，排气孔打开，排出废气，活塞再向下运动，换气孔打开，受到压缩的混合气便从曲轴箱经进气孔流入气运动，换气孔打开，受到压缩的混合气便从曲轴箱经进气孔流入气缸内，并扫除废气缸内，并扫除废气 School of Automotive Studies Tongji University School of Automotive Studies Tongji University School of Automotive Studies Ton