METHOD FOR CONTROLLING AN INTERNAL COMBUSTION ENGINE OF A MOTOR VEHICLE

Method for controlling an internal combustion engine of a motor vehicle equipped with high pressure and low pressure partial exhaust gas recirculation circuits, during which the fraction of fresh air in the intake manifold is determined and an estimation of the fraction of fresh air upstream of the intake throttle is determined. The method comprises the following steps: a set point for the fraction of fresh air is determined, the fraction of fresh gas in the exhaust manifold is determined by measurement of an exhaust lambda probe, it is determined whether the set point for the fraction of fresh air and whether the estimation of the fraction of fresh air upstream of the intake throttle are greater than the fraction of fresh gas in the exhaust manifold, if this is not the case, the closing of the high pressure partial exhaust gas recirculation circuit is controlled, if this is the case, a control error is determined by subtracting the set point for the fraction of fresh air from the estimated fraction of fresh air in the intake manifold, the flow rate of the high pressure partial exhaust gas recirculation circuit is estimated as a function of the control error, of a gain, of an air flow measurement, of the set point for the fraction of fresh air, of the estimated fraction of fresh air, of the fraction of fresh gas in the exhaust manifold and of the estimation of the fraction of fresh air upstream of the intake throttle.