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Individual A/F Estimation and Control With the Fuel–Gas Ratio for Multicylinder IC Engines

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4 Author(s)
Suzuki, K. ; Dept. of Mech. Eng., Sophia Univ., Tokyo, Japan ; Tielong Shen ; Kako, J. ; Yoshida, S.

In internal combustion engines with multicylinders, balancing the air-fuel ratio (A/F) for individual cylinders is an important issue for providing high-quality torque generation and reducing emissions. This paper addresses the individual A/F control problem for a six-cylinder engine with a single sensor. First, a modeling method to estimate the individual fuel-gas ratio, which immediately provides the A/F, is proposed, and using the estimation model, an adaptive generalized predictive control approach to balancing the individual cylinder characteristics is presented, which targets the static engine-operation mode. The effectiveness of the presented model is validated based on the experimental results, and a comparison with existing models is given based on the experiments. Finally, control performance with the proposed individual A/F control approach is demonstrated with the experiments conducted on a six-cylinder engine test bench.

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Vehicular Technology, IEEE Transactions on  (Volume:58 ,  Issue: 9 )