摘要
基于柴油机的变海拔性能恢复目标,通过对增压系统进行参数估算和选配,确定了某V型6缸柴油机与废气放气式增压系统的匹配方案,并采用GT-Power仿真软件分别计算了柴油机外特性和部分负荷的变海拔性能,最终确定了增压系统的全工况控制策略。研究结果表明:在外特性工况,基于高海拔匹配的增压系统通过关闭放气阀可以满足柴油机的进气耗功需求,实现了柴油机的变海拔功率恢复目标;随着海拔高度的降低,增压系统可以基于进气耗功的变化适当开启放气阀来保证柴油机的正常运行;在全工况范围内,随海拔高度的上升,柴油机对应工况点的放气阀开度逐渐减小,并在海拔3 000m以上完全关闭。当海拔从0增加到2 000m时增压系统放气流量比的最大值减小了30.7%,最小值减小了65.2%。
Based on the goals for the performance recovery of diesel engine at different altitudes, andthrough the parameter estimation and matching of turbocharging system, the matching scheme between a V type sixcylinderdiesel engine and the turbocharging system with exhaust gas relieve valve is determined. The external characteristicand part load characteristics of diesel engine at varying altitudes are calculated with GT-Power simulationsoftware, and the full condition control strategy of turbocharging system is finally worked out. The simulation resultsshow that in full load condition, the turbocharging system based on high-altitude match can meet the requirement ofair induction work consumed by closing exhaust gas release valve, achieving the goal of power recovery of diesel engineat varying altitudes. With the fall of altitude, the turbocharging system can appropriately open the release valvebased on the change in induction work consumed to ensure the normal operation of diesel engine. In full range ofworking conditions, the opening of release valve will gradually reduce with the increase of altitude, and completelyshut down when altitude is above 3000m.
出处
《汽车工程》
EI
CSCD
北大核心
2016年第7期791-799,共9页
Automotive Engineering
关键词
柴油机
增压系统
控制策略
变海拔
diesel engine
turbocharging system
control strategy
varying altitudes
