Input observer-based individual cylinder air-fuel ratio control: Modelling, design and validation

被引:23
|
作者
He, Bin [1 ]
Shen, Tielong [2 ]
Kako, Junichi [3 ]
Ouyang, Minggao [1 ]
机构
[1] Tsinghua Univ, State Key Lab Automot Safety & Energy, Beijing 100084, Peoples R China
[2] Sophia Univ, Dept Mech Engn, Tokyo 1028554, Japan
[3] Toyota Motor Co Ltd, Power Train Dev Ctr, Shizuoka 4101193, Japan
关键词
air-fuel ratio; individual cylinder control; input estimation; spark ignition engine; UEGO sensor;
D O I
10.1109/TCST.2007.916323
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
A general approach is proposed to address the cylinder-to-cylinder air-fuel ratio (AFR) balancing control problem using a single universal exhaust gas oxygen (UEGO) sensor. Using the multirate sampling technique, a control-oriented engine model, well combining the fuel delivery dynamics and exhaust gas dynamics, is established. Gas mixing phenomena is characterized by a gas mixing matrix, which is valid both for equal-length and unequal-length exhaust runners. Based on the developed model, the observability of the individual cylinder AFR estimation problem is analyzed using the input observability concept. An input observer using the one-step forward feedback is proposed to design the estimator. Using the estimated AFR, a decoupled PI compensator is designed for each cylinder to compensate the cylinder-by-cylinder variations. Finally, the proposed approach is verified by simulation and experimental results.
引用
收藏
页码:1057 / 1065
页数:9
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