Method for controlling an egr circuit of a motor vehicle engine, valve for implementing said method, and engine having said valve

Abstract

The invention relates to a method for controlling an exhaust gas recirculation circuit () for an internal combustion engine (M) of a motor vehicle. The engine (M) is linked to an air intake circuit () and to a gas exhaust circuit () linked to the air intake circuit () by the recirculation circuit (). A first valve () controls the flow of air upstream from the recirculation circuit (), and gases that are recirculated within the a second valve () controls the flow of exhaust recirculation circuit (). In the method of the invention, the recirculation of the exhaust gases is in particular controlled by means of measuring a pressure difference across the terminals of the second valve (). The method comprises the following steps: a) the first and second valves () are closed, the first valve () being arranged so as to allow, in a closed position, the passage of an air leak current; b) the first and second valves () are concomitantly opened so as to provide a sufficient pressure difference across the terminals of the second valve () so as to enable the measurement of the pressure difference in the terminals thereof. Due to the invention, the pressure difference across the terminals of the second valve () remains sufficiently high so as to allow the efficient measurement of said pressure difference.