吉林大学学报(工学版) ›› 2013, Vol. 43 ›› Issue (06): 1574-1580.doi: 10.7964/jdxbgxb201306023

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Individual cylinder air-fuel ratio estimation based on input observer

WANG Ping1, JIANG He-yao2, FAN Ya-nan1, CHEN Hong1   

  1. 1. College of Communication Engineering, Jilin University, Changchun 130022, China;
    2. The 713th Research Institute of China Shipbuilding Industry Corporation, Zhengzhou 450015, China
  • Received:2012-10-19 Online:2013-11-01 Published:2013-11-01

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Abstract:

Based on the input observer, an estimator of individual cylinder Air-Fuel Ratio (AFR) in a SI engine is proposed. The fuel path model, which is constituted by fuel wall-wetting model, exhaust gas mix model, exhaust gas transfer model and universal exhaust gas oxygen (UEGO) sensor model, is established. Then, under the same working condition and with the same input, the developed model is validated using the precise engine model of enDYNA. Furthermore, an input observer based on regional pole placement is proposed to design an AFR estimator. Finally, the rationality and feasibility of the proposed observer and AFR estimator are validated by real-time and offline simulations on a simulation platform for automotive engine control.

Key words: control theory, individual cylinder air-fuel ratio, fuel path model, input-observer, regional pole placement

CLC Number: 

  • TP273

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