Development of a New Model Based Air-Fuel Ratio Control System

Event
SAE World Congress & Exhibition
Authors Abstract
Content
The second-generation air-fuel ratio control method has been developed to reduce exhaust gas emissions in accordance with the improvements in catalysts. The control system consists of a feedforward control using a fuel behavior model, a feedback control using an universal exhaust gas oxygen (UEGO) sensor and a feedback control utilizing the heated exhaust gas oxygen (HEGO) sensor. This significantly improves air-fuel ratio tracking performance by feedforward control derived from the models that express the dynamic phenomena and the disturbance attenuation by UEGO feedback controller which compensates for the long dead-time characteristics by the state predictive control. The tracking performance and the disturbance attenuation can be achieved independently by a two-degree-of-freedom structure presented in this paper. The exhaust air-fuel ratio downstream of the catalyst precisely converges to stoichiometry, which maximizes the conversion efficiency of the catalyst. Experimental results on actual vehicles show the effectiveness of presented method.
Meta TagsDetails
DOI
https://doi.org/10.4271/2009-01-0585
Pages
9
Citation
Okazaki, S., Kato, N., Kako, J., and Ohata, A., "Development of a New Model Based Air-Fuel Ratio Control System," SAE Int. J. Engines 2(1):335-343, 2009, https://doi.org/10.4271/2009-01-0585.
Additional Details
Publisher
Published
Apr 20, 2009
Product Code
2009-01-0585
Content Type
Journal Article
Language
English