Method of estimation by extended Kalman filter wealth in a cylinder of a combustion engine

- The present invention relates to a method for estimating the richness in each cylinder of an injection internal combustion engine having an exhaust circuit on which a sensor measures the richness of the exhaust gases. An estimator based on a Kalman filter is coupled with a physical model representing the ejection of gas cylinders and their path in the exhaust circuit to capteur.- Application to engine controls.