稀混合气火花辅助压燃中着火温度影响及其控制参数研究  

Study on ignition temperature conditions and influencing factors of lean burn spark assisted compression ignition

作　　者：孙剑[1] 耿路[1] 赖海鹏[1] 高定伟[1] 于书海[1] SUN Jian;GENG Lu;LAI Haipeng;GAO Dingwei;YU Shuhai(Great Wall Motor Co.Ltd.,Baoding 071000,China)

机构地区：[1]长城汽车股份有限公司,保定071000

出　　处：《汽车安全与节能学报》2021年第2期232-242,共11页Journal of Automotive Safety and Energy

摘　　要：为了实现对着火时刻的调控,解耦关键控制参数对压燃程度和压燃时刻的影响,采用小升程凸轮轴,在负气门重叠角下,过量空气系数为1.2时,通过实验和计算,进行了火花辅助压燃着火温度影响及其关键控制参数研究。结果表明:以循环压燃部分放热量相对循环放热量占比定义压燃率,可以反映压燃程度;压燃率可以回归为以有效压缩比、废气再循环(EGR)率、点火提前角等关键控制参数为自变量的解析关系;提取压燃时刻未燃部分混合气的温度958.13(±15)K作为压燃着火温度。总之,可以将压燃率的影响因素分解到操作参数和结构参数,在某一具体参数下,通过压燃率与关键控制参数解析关系,对着火时刻进行预判和调控。The ignition conditions and influencing factors of auxiliary compression ignition were studied to realize the control towards the moment of fire and to decouple the influence of key control parameters on the degree of compression combustion and the moment of compression combustion.Under the condition of negative valve overlap angle by using small lift camshaft and the air excess coefficient was 1.2,the experiments and calculations were carried out.The results show that the compression burning rate can be defined by the proportion of the heat released in the circulation compression burning part relative to that of the circulation emission,which can reflect the degree of compression burning.The compression burning rate can be reflected by the key control parameters such as the effective compression ratio,exhaust gas recirculation(EGR)rate and ignition advanced angle,which are the analytic relationship of independent variables.The temperature 958.13(±15)K of the unburned part of mixed gas at the moment of compression combustion is given as the ignition temperature.In a word,the influencing factors of the compression combustion rate can be decomposed into operation parameters and structural parameters.For a specific parameter,through the analytic formulation of the relationship between the compression combustion rate and key control parameters,the fire-timing can be predicted and controlled.

关 键 词：汽油机 辅助压燃 有效压缩比 废气再循环(EGR)率 压燃率 

分 类 号：TK411.2[动力工程及工程热物理—动力机械及工程]