Patent ID: 6233936
Filing Date: 2001-05-22
Classification: F02M

Abstract:
Internal combustion engine, comprising an inlet manifold (3) and an exhaust manifold (2), respectively, opening into inlet ducts and exhaust ducts, respectively, to the engine cylinders, a charging unit (6), the pressure side (8) of which is connected to an inlet air conduit (9) opening into the inlet manifold; and a conduit (17a, 17b, 19) for recirculation of exhaust from the exhaust side of the engine to its inlet side, characterized in that the recirculation conduit (17a, 17b, 19) communicates with valve means (16a, b; 40a, b) which are connected directly to the exhaust manifold and that valve control means (13) are arranged, during such operating conditions where the exhaust is to be recirculated, to only Permit the valve means to open when the exhaust pressure in the manifold (2) is higher than the air pressure on the pressure side of the charging unit (6), andcharacterized in that the exhaust manifold (2) is divided into at least two branch portions (2a, b) which open into a common exhaust pipe (4), and that the valve means comprise one valve (16a, b; 40a, b) in each branch portion.