Patent ID: 7637098

Claim:
An arrangement for controlling exhaust pressure pulsation of a combustion engine comprising an engine comprising six cylinders, an inlet for supply of air to the cylinders, and an exhaust manifold for delivery of exhaust gases from the cylinders, the arrangement comprising a first outlet to an exhaust system and a second outlet to a conduit ( 24 ) for feeding exhaust gases back, via an EGR circuit, from at least one of the cylinders of the engine to the inlet at least one of the cylinders being arranged for addition of means for regeneration of an exhaust gas aftertreatment unit situated in the exhaust system, the exhaust manifold comprising branch volumes each appurtenant to a respective cylinder port, a first collective subvolume connecting both to three of the branch volumes situated on one side of the exhaust manifold and to the first outlet to the exhaust system, a second collective subvolume connecting both to at least one of the other branch volumes and to the second outlet to the EGR circuit, and a third collective subvolume which both connects to remaining branch volumes and links the first and second collective subvolumes, wherein a mutual relationship between a swept volume of the cylinders, the exhaust manifold volume and the third collective subvolume, the ratio of mass flow of EGR to the mass flow of exhaust gases and the ratio between pressure maximum and pressure minimum in a pulsating exhaust flow, are such that EGR gas is separated from regeneration gas in the exhaust manifold.