冷却液温度对柴油机起动首循环燃烧的影响  

Effect of Coolant Temperature on the First Cycle Combustion of Diesel Engine under Start Operation

作　　者：苏岩[1] 刘忠长[1] 许允[1] 王永军 杜宝程[3] 

机构地区：[1]吉林大学内燃机系,吉林长春130025 [2]一汽-大众汽车有限公司,吉林长春130011 [3]车辆排放与节能重庆市市级重点实验室,重庆400039

出　　处：《内燃机学报》2007年第3期202-207,共6页Transactions of Csice

基　　金：国家自然科学基金资助项目(50376019)

摘　　要：冷却液温度是柴油机起动过程中影响失火与燃烧不稳定性的重要因素。喷油首循环的燃烧对后续工作循环着火有较大影响。为了分析冷却液温度对柴油机起动首循环燃烧和排放的影响规律,利用基于循环控制的柴油机起动过程燃烧、排放测控系统,在一台单缸直喷式柴油机上进行了试验研究。试验结果表明冷却液温度对柴油机起动首循环燃烧的稳定性有较大影响。提高冷却液温度对于消除起动过程首循环燃烧状态的不稳定性具有较明显的作用。冷却液温度较低时,使着火滞后期增长,很容易导致失火或不完全燃烧现象,生成较高HC排放。试验也验证了所建立的测控系统为研究柴油机起动过程提供了一种有效的测试手段。Coolant temperature is a key parameter affecting misfire and instability of diesel engine combustion during start. The combustion of the first cycle with fuel injection is important to the next cycle ignition. The experiment was conducted on a single-cylinder direct injection diesel engine to study the effect of coolant temperature on combustion and emissions of the first cycle during start. The combustion analysis and emission measurement are based on cycle-to-cycle control and test system. The result indicated that the coolant temperature has an obvious influence on the stability of the first cycle combustion. When the temperature rises, the misfire and partial burn decrease. Decreasing coolant temperature increases the ignition delay and easily leads to the misfire and the incomplete combustion phenomenon, resulting in higher HC emissions. The result also showed that the control and test system is an effective facility to study diesel engine start process.

关 键 词：起动 首循环 燃烧 冷却液温度 柴油机 

分 类 号：TK421.2[动力工程及工程热物理—动力机械及工程]