基于状态观测器的天然气发动机控制策略研究  

Research of Natural Gas Engine Control Strategy Based on State Observer

作　　者：邹博文[1] 李静波[1] 陈本林[1] 邢春鸿[1] 

机构地区：[1]中国汽车工程研究院-国家燃气汽车工程技术研究中心

出　　处：《汽车技术》2008年第11期5-8,共4页Automobile Technology

摘　　要：针对天然气发动机,在建立进气空燃比均值模型的基础上,根据稳态工况下精度高、瞬态工况下响应快的控制需求,在稳态工况下设计了闭环状态观测器,保证了对进气量的精确估计;在瞬态工况下设计了进气量开环而压力闭环的状态观测器,在确保对进气量估值具有较高精度的同时提高了估计实时性。结合天然气密度补偿策略形成了基于模型的控制策略,通过台架试验对控制策略进行了验证。Based on a model with mean intake air fuel ratio and the control requirements of high precision under steady work condition and quick response under transient work condition,a close-loop state observer was designed under steady work condition to guarantee the accurate estimation for intake air quantity;and a state observer with intake air quantity open loop and pressure close loop was designed under transient work condition to obtain not only higner accuracy but also better real time of intake air quantity estimation.The NG density compensation strategy was introduced to improve control accuracy and the control strategy was validated by bench tests.

关 键 词：天然气发动机 状态观测器 空燃比 控制策略 

分 类 号：U464.174[机械工程—车辆工程]