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

摘要

Method for controlling an egr circuit of a motor vehicle engine, valve for implementing said method, and engine having said valve The invention relates to a method for controlling an exhaust gas recirculation circuit (2c) for an internal combustion engine (m) of a motor vehicle. the motor (m) is connected to an air inlet circuit (2a) and a gas exhaust circuit (2b) connected to the air inlet circuit (2a) by the recirculation circuit (2c). A first valve (15) controls the flow of exhaust gases that are recirculated within the recirculation circuit (2c). In the method of the invention, exhaust gas recirculation is in particular controlled by measuring a pressure difference across the terminals of the second valve (16). the method comprises the following steps: a) the first and second valves (15, 16) are closed, the first valve (15) being arranged to allow, in a closed position, the passage of an air leakage stream; b) the first and second valves (15, 16) are concomitantly opened to provide a sufficient pressure difference across the terminals of the second valve (16) to permit measurement of the pressure difference at the terminals. Due to the invention, the pressure difference across the terminals of the second valve 16 remains high enough to allow efficient measurement of said pressure difference.