Internal combustion engine with integrated in the cylinder head multi-flow exhaust manifold

摘要

Internal combustion engine having a multi-flow exhaust manifold integrated in the cylinder head, with at least one cylinder in which at least two exhaust valves are arranged, wherein each exhaust valve is associated with a separate exhaust passage, and each separate exhaust port of the cylinder is connected to a separate exhaust manifold of the exhaust manifold, the separate exhaust ports of a cylinder differ with respect to at least one parameter determining the cooling effect, wherein each outlet channel is assigned a separate cooling jacket, wherein a first cooling jacket of the first outlet channel is equipped with a lower specific cooling capacity compared to a further cooling jacket of the further outlet channel, the first outlet channel with a first exhaust gas turbocharger with respect to the further exhaust duct associated with another exhaust gas turbocharger is assigned to different working range, wherein the first exhaust duct associated with the first exhaust gas turbocharger its A background charging pressure already reached at low exhaust gas energy and the further exhaust gas turbocharger reaches its design boost pressure at a comparatively higher exhaust gas energy than that exhaust energy, which is necessary to reach the design charge pressure of the first exhaust gas turbocharger and the operation of at least one exhaust valve of the cylinder is variable with respect to valve lift and valve timing.