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可变几何涡轮增压器通过调节喷嘴环叶片的转角,改变涡轮的流通面积,使涡轮的流量特性和效率特性发生变化,从而使涡轮与柴油机在较宽广的工况范围内保持良好的匹配。探讨了VGT涡轮的流量特性和效率特性,阐述了可变几何涡轮增压器的整体结构、控制装置和工作原理,分析了可变几何涡轮增压器控制逻辑,对不同VGT段数对柴油机性能的影响进行了比较。
The variable geometry turbocharger changes the flow and efficiency characteristics of the turbine by adjusting the rotation angle of the nozzle ring and changing the flow area of the turbine so as to ensure a good match between the turbine and the diesel engine over a wide range of working conditions. The flow characteristics and efficiency characteristics of VGT turbine are discussed. The overall structure, control device and working principle of VGT turbine are expounded. The control logic of variable geometry turbocharger is analyzed. The impact is compared.