Control unit and method therein for controlling exhaust valves of cylinders in an internal combustion engine

Abstract

A method performed by a control unit () for controlling exhaust valves (A-A,B-B) of cylinders (-) in an internal combustion engine () is provided. The method comprise controlling () a number of first exhaust valves (A-A) for a first set of cylinders (-) to transfer exhaust gas to a turbine ()) during part of an exhaust phase (Δt) of the first set of cylinders (-) via a first exhaust manifold (). Also, the method comprises controlling () a number of second exhaust valves (B-B) for the first set of cylinders (-) to transfer exhaust gas to an exhaust gas recirculation, EGR, conduit ()) during part of the exhaust phase (Δt) of the first set of cylinders (-) via a second exhaust manifold (). The method further comprises controlling () a number of first exhaust valves (A-A) for a second set of cylinders (-) to transfer exhaust gas to the turbine () during part of an exhaust phase (Δt) of the second set of cylinders (-) via the first exhaust manifold (). Furthermore, the method comprises controlling () a number of second exhaust valves (B-B) for the second set of cylinders (-) to transfer exhaust gas to the EGR conduit () during a part of the exhaust phase (Δt) of the second set of cylinders (-) via the second exhaust manifold (). Here, the exhaust phase (Δt) of the first set of cylinders (-) is separated in time from the exhaust phase (Δt) of the second set of cylinders (-). A control unit (), a computer program, a carrier, an internal combustion engine and a vehicle is also provided.