一台康明斯M11型柴油机工作无力,转速无法提高。检查发现,进气歧管至PT燃油泵上的AFC(空气燃油混合比控制)装置的气管漏气,更换该气管后,转速恢复正常。分析该柴油机供油系统原理,即可知不能提速的原因。该机进气系统为增压中冷进气方式。在柴油机启动或加速时,由于废气涡轮增压器作用滞后,空气量瞬时减少,混合气变浓,燃烧不完全,排出大量黑烟,不仅柴油机功率下 A Cummins M11 diesel engine was unable to work and the speed could not be increased. The inspection revealed that the trachea of ​​the AFC (air-fuel mixture ratio control) device on the intake manifold to the PT fuel pump leaked air and the speed was restored to normal after the gas pipe was replaced. Analysis of the principle of the diesel fuel supply system, you can see the reason can not speed. The aircraft intake system is supercharged air intake mode. When the diesel engine starts or accelerates, due to the lagging role of the exhaust gas turbocharger, the amount of air instantaneously decreases, the air-fuel mixture becomes thick, the combustion is incomplete and a large amount of black smoke is discharged, not only the power of the diesel engine