车用乙醇汽油体积分数估计  

Ethanol-gasoline volume fraction estimation of vehicles

作　　者：郑太雄[1] 王波[2] 李永福[2] 陈琳[2] 

机构地区：[1]重庆邮电大学先进制造工程学院,重庆400065 [2]重庆邮电大学自动化学院,重庆400065

出　　处：《华中科技大学学报（自然科学版）》2015年第7期44-48,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(61304197);重庆市基础与前沿研究计划资助项目(cstc2014jcyjA60003);重庆市教委科学技术研究资助项目(KJ130506)

摘　　要：为获得精确的乙醇体积分数,在发动机进气模型的基础上,设计了高增益观测器估计歧管压力,并对观测器误差进行了收敛性和稳定性分析.设计PI控制器对空燃比进行控制,使过量空气系数趋于理论值.利用PI控制器输出的燃油反馈信号,通过积分清零运算得出化学计量空燃比(Rs),根据Rs与乙醇体积分数的关系计算得出乙醇体积分数估计值.仿真结果表明:乙醇体积分数估计时间在2s以内,估计误差绝对值小于1%,满足汽车的排放性和经济性要求.For acquiring aprecise estimation of ethanol proportion,based on the engine air charge model,the high gain observer was designed to estimate the manifold absolute pressure,and property of convergence and stability were analyzed to the observer errors.PI controller was proposed to control the air to fuel ratio,which compelled the excess air coefficient to the theoretical value.Afterwards,the fuel feedback signal from the PI control was utilized,and the stoichiometric air-to-fuel ratio（Rs）was achieved through the integral zero clearing operation.At last,ethanol volume fracrion estimation value was calculated based on the relationship between the Rsand the ethanol volume fracrion.Simulation results show that the estimated time of the ethanol volume fracrion is within 2s,and the absolute value of the estimated error is less than 1%,which meets the emissions and fuel economy of the vehicles.

关 键 词：乙醇汽油 体积分数 高增益观测器 歧管压力 比例积分控制器 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]