PRESSURE SENSOR SYSTEM FOR CHARGE AIR LOAD CONTROL

An assembly (22) is provided for measuring the air flow in an air intake duct (13,23) of an internal combustion engine (2). The assembly (22) comprises a housing (38) with an inlet opening (39), an outlet opening (40), a channel (41) with an inner wall (42) defining a predetermined cross-sectional area and a closure member (43) that is movably mounted in the channel (41) between a closed and opened position. A first annular chamber (45) is situated upstream from the closure member (43) and a second annular chamber (46) is placed downstream of the closure member (43). Each chamber has an inner chamber wall (47,48) with a number of apertures (53,54,55,56) that are in fluid communication with the channel (41). A first pressure sensor (61) is connected to the first chamber (45) for measuring a pressure in the first chamber (45), a second pressure sensor (60) being connected to the first chamber (45) and to the second chamber (46) for measuring a difference in pressure in the first and second chamber (45,46).