双VVT开度对GDI增压发动机性能的影响  

The Influence of Dual VVT Opening to the Performance of GDI Charged Engine

作　　者：刘国军[1] 段景辉[1] 杨金鹏[1] 韩广华[1] 席星亮[1] 

机构地区：[1]长城汽车股份有限公司动力研究院,河北保定071000

出　　处：《小型内燃机与摩托车》2013年第2期18-20,50,共4页Small Internal Combustion Engine and Motorcycle

摘　　要：通过对配置双VVT的GDI增压发动机进行试验,研究了双VVT开度变化对GDI增压发动机外特性和部分负荷性能的影响。试验结果表明,中等转速高负载采用较大的气门重叠角,可提高体积效率;低转速高负载采用较小的气门重叠角,可提高充量系数。部分负荷方面,较小气门重叠角对改善发动机稳定性有益。The influence of dual VVT opening to external characteristic and part bo charged engine is investigated through the experiment on GDI turbo charged load performance of GDI turengine with dual VVT. The test result indicates that bigger valve overlap angle is adopted at medium speed ＆ high load to improve volumetric efficiency; smaller valve overlap angle is adopted at low speed ＆ high load to increase charging coefficient. While at part load, smaller valve overlap angle is beneficial to improve the engine stability.

关 键 词：VVT 缸内直喷 涡轮增压 气门重叠角 

分 类 号：TK41[动力工程及工程热物理—动力机械及工程]