华中科技大学学报（自然科学版）Issue(7)：44-48,5.DOI:10.13245/j.hust.150709
车用乙醇汽油体积分数估计
Ethanol-gasoline volume fraction estimation of vehicles
摘要
Abstract
For acquiring a precise 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 con‐trol the air to fuel ratio ,which compelled the excess air coefficient to the theoretical value .After‐wards ,the fuel feedback signal from the PI control was utilized ,and the stoichiometric air‐to‐fuel rati‐o (Rs ) was achieved through the integral zero clearing operation .At last ,ethanol volume fracrion es‐timation value was calculated based on the relationship between the Rs and the ethanol volume fracri‐on .Simulation results show that the estimated time of the ethanol volume fracrion is within 2 s ,and the absolute value of the estimated error is less than 1% ,w hich 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Key words
ethanol-gasoline/volume fracrion/high gain observer/manifold pressure/proportion in-tegral controller (PIC)分类
信息技术与安全科学引用本文复制引用
郑太雄,王波,李永福,陈琳..车用乙醇汽油体积分数估计[J].华中科技大学学报（自然科学版）,2015,(7):44-48,5.基金项目
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（K J130506）． （）
