Method of estimating the fuel/air ratio in a cylinder of an...

Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means

Reexamination Certificate

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C073S023320

Reexamination Certificate

active

07086391

ABSTRACT:
The present invention relates to a method of estimating the fuel/air ratio in each cylinder of a multicylinder internal-combustion engine comprising an exhaust circuit in which a single detector measures the fuel/air ratio of the exhaust gas. The estimator comprises a physical model (RTM) representing the expulsion of the gases from the cylinders and the travel thereof in the exhaust circuit to the detector, the model being coupled with a non-linear state observer of Extended Kalman Filter (KF) type.

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