农业机械学报2017，Vol.48Issue(6)：356-364,9.DOI:10.6041/j.issn.1000-1298.2017.06.047
变海拔柴油机可变喷嘴增压系统控制策略研究
Control Strategy of Variable Nozzle Turbocharging System for Diesel Engine at Different Altitudes
摘要
Abstract
Aiming to achieve the goal of performance recovery of diesel engine at high altitude,a V-type six-cylinder diesel engine was determined via the parameter estimation and thermodynamics analysis for turbocharging scheme.The original matching scheme was not suitable for altitude varying in large range operation condition.A variable nozzle turbocharging system was matched for diesel engine and it showed that no fallacies existed from the operation lines.A simulation model was established with GT-Power software and verified by test data.The simulation model was applied to performance prediction under different working conditions.Then the operating performance of engine at different altitudes was calculated,including the external characteristics and part load characteristics.The control strategy of variable nozzle turbocharging system for full operation conditions can be obtained in the end.It showed that the air demand of diesel engine can be satisfied with small opening of nozzle ring at high altitude and full load condition,and the goal of power restoring would be achieved.The charging system needed to increase the opening of nozzle ring to improve engine performance with the drop of altitude.The opening of nozzle ring should be deduced generally as the altitude increased in the whole operation area,moreover,it needed to adopt the minimum nozzle ring opening if the altitude was above 3 000 m except under some low load conditions.The operating point of the lowest fuel consumption would transfer from low-speed and low-altitude area into low-speed and high-altitude area with the fall of engine load.关键词
柴油机/变海拔/可变喷嘴/增压系统/控制策略/流量系数Key words
diesel engine/variable altitudes/variable nozzle turbocharger/boost system/control strategy/flow coefficient分类
能源科技引用本文复制引用
张慧龑,李华雷,刘胜,石磊,邓康耀,杨震寰..变海拔柴油机可变喷嘴增压系统控制策略研究[J].农业机械学报,2017,48(6):356-364,9.基金项目
国家安全重大基础研究计划(国防973计划)项目(6132520202) （国防973计划）
