Method for controlling an internal combustion engine

An internal combustion engine comprising at least one first cylinder and at least one second cylinder with respective reciprocating pistons, an intake guide arranged to guide air from a fresh air intake arrangement to the first and second cylinders, a fuel system arranged to inject fuel into the first and second cylinders, a first exhaust guide and a second exhaust guide arranged to separately guide gases from the first and second cylinders, respectively, towards an exhaust after treatment system, a first exhaust valve located in the first exhaust guide so as to reduce or inhibit the transport of gases from the first cylinder to the exhaust after treatment system, a second exhaust valve located in the second exhaust guide, so as to reduce or inhibit the transport of gases from the second cylinder to the exhaust after treatment system, the first and second exhaust valves being individually controllable, a first EGR passage branch extending from the first exhaust guide and being arranged to communicate with the intake guide, a second EGR passage branch extending from the second exhaust guide and being arranged to communicate with the intake guide, a first and a second EGR valve being separate valves from the first and second exhaust valves and being arranged to control the flow through the first and second EGR passage branches, respectively, wherein the first and second EGR valves are individually controllable, wherein the first and second EGR passage branches extend from a respective of the first and second exhaust guides, upstream of the first and second exhaust valves, wherein a turbine of a turbo charger of the engine is located downstream of the first and second exhaust valves.

A method for controlling an internal combustion engine comprising at least one first cylinder and at least one second cylinder with respective reciprocating pistons, an intake guide:

• arranged to guide air from a fresh air intake arrangement to the first and second cylinders, a fuel system arranged to inject fuel into the first and second cylinders, a first exhaust guide and a second exhaust guide arranged to separately guide gases from the first and second cylinders, respectively, towards an exhaust after treatment system, a first exhaust valve located in the first exhaust guide so as to reduce or inhibit the transport of gases from the first cylinder to the exhaust after treatment system, a second exhaust valve located in the second exhaust guide, so as to reduce or inhibit the transport of gases from the second cylinder to the exhaust after treatment system, the first and second exhaust valves being individually controllable, a first EGR passage branch extending from the first exhaust guide and being arranged to communicate with the intake guide, a second EGR passage branch extending from the second exhaust guide and being arranged to communicate with the intake guide, a first and a second EGR valve being separate valves from the first and second exhaust valves and being arranged to control the flow through the first and second EGR passage branches, respectively, wherein the first and second EGR valves are individually controllable, wherein the intake guide comprises a first and a second intake guide branch, whereby each of the first and second cylinders is arranged to receive air from the fresh air intake arrangement separately via first and second intake guide branches, respectively, the first EGR passage branch extending to the first intake guide branch, and the second EGR passage branch extending to the second intake guide branch, the method comprising receiving in the first cylinder, from the first intake guide branch, air from the fresh air intake arrangement, controlling the fuel system so as to inhibit injection of fuel into the air received in the first cylinder, expelling from the first cylinder, to the first exhaust guide, the air received in the first cylinder, controlling the first exhaust valve so as to reduce or inhibit the transport of the air from the first cylinder to the exhaust after treatment system and simultaneously recirculating the air from the first exhaust guide to the first intake guide branch by means of the first EGR passage branch, receiving in the second cylinder, from the second intake guide branch, air from the fresh air intake arrangement, injecting fuel into the second cylinder so as to provide repetitive combustions with air, expelling from the second cylinder, to the second exhaust guide, exhaust gases produced by the combustions in the second cylinder, and guiding at least a portion of the exhaust gases through the second exhaust guide, and to the exhaust after treatment system.