VVT相位及初始火核对高压缩比汽油机燃烧特性的影响  

The Influence of VVT Phase and Initial Spark Timing on The Combustion Characteristics of High Compression Ratio Gasoline Engines

作　　者：胡鹏 王爱国[2] HU Peng;WANG Aiguo(Chery Commercial Vehicle(Anhui)Co.,Ltd.,Wuhu 241009,China;Anhui Technical College Of Mechanical and Electrical Engineering,Wuhu 241009,China)

机构地区：[1]奇瑞商用车(安徽)有限公司,安徽芜湖241009 [2]安徽机电职业技术学院,安徽芜湖241009

出　　处：《内燃机》2023年第4期21-25,共5页Internal Combustion Engines

摘　　要：在一台高压缩比自然吸气汽油机上,通过台架实验研究了进排气相位、初始火核对燃烧参数及燃油消耗率(BSFC)的影响。结果表明,合理设置进气门晚关相位是实现发动机较高热效率的关键技术。相对原机型,应用进气门晚关策略及高压缩技术后,发动机BSFC降低了7%~11%。进气门晚关策略可提高缸内工质压力,降低泵气损失和增大燃烧定容度,在200kPa、2000r/min工况下比进气门早开策略的BSFC低了5g/(kW·h)。优化初始火核成长空间后,在300kPa、2000r/min工况下BSFC降低了6g/(kW·h)。The effects of intake and exhaust camshaft timing,as well as the initial flame kernel,on combustion parameters and Brake Specific Fuel Consumption(BSFC)were investigated through bench experiments on a naturally aspirated gasoline engine with high compression ratio.The results showed that the proper setting of a delayed intake valve closing phase is a key technology for achieving higher thermal efficiency in the engine.Compared to the original engine configuration,the implementation of a delayed intake valve closing strategy and high compression technology resulted in a reduction of 7%to 11%in engine BSFC.The delayed intake valve closing strategy increased the pressure inside the cylinder,reduced pumping losses,and enlarged the combustion constant volume.Under the operating conditions of 200 kPa and 2000 r/min,the BSFC was lowered by 5 g/(kW·h)compared to the strategy of early intake valve opening.Furthermore,optimizing the initial flame kernel growth space led to a decrease of 6 g/(kW·h)in BSFC under the conditions of 300 kPa and 2000 r/min.

关 键 词：高压缩比 可变气门正时策略 初始火核 台架试验 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]