INTERNAL COMBUSTION ENGINE SYSTEM

The invention relates to an internal combustion engine system (100), comprising: - an internal combustion engine (2) comprising a cylinder block (3) housing a plurality of cylinders (4) , a first intake manifold (6a) connected to a first group of cylinders (4a), a second distinct intake manifold (6b) connected to a second group of cylinders (4b) and a first, respectively a second, exhaust manifold (8a, 8b) for receiving the exhaust gas emitted from the first, respectively the second, group of cylinders (4a, 4b); - an air line (10); - an EGR line (20) connected to the first and second exhaust manifolds (8a, 8b); - the system (100) also includes a mixing unit (30) comprising a four-way valve, said four-way valve having a first inlet (31) connected to the air line (10), a second inlet (32) connected to the EGR line (20), a first outlet (33) connected to the first intake manifold (6a) and a second outlet (34) connected to the second intake manifold (6b); the system (100) being characterized in that: - said first inlet (31) connected to the air line (10), said second inlet (32) connected to the EGR line (20), said first outlet (33) and said second outlet (34) form a substantially X-shape; - said first inlet (31) connected to the air line (10) and said second inlet (32) connected to the EGR line (20) are coaxial and the first outlet (33) and second outlet (34) are coaxial such that the first inlet (31) connected to the air line (10) is diagonally facing the second inlet (32) connected to the EGR line (20) and the first outlet (33) is diagonally facing the second outlet (34).