Internal combustion engine system

A method for exhaust gas aftertreatment for an internal combustion engine system, the internal combustion engine system comprising an internal combustion engine (ICE), an exhaust aftertreatment system (EATS) located downstream of said ICE and comprising one or more exhaust aftertreatment devices, an exhaust gas duct fluidly connecting said ICE and said EATS, an exhaust gas recirculation duct being in fluid communication with said exhaust gas duct and fluidly connecting a first point downstream of said ICE and a second point upstream thereof, and an exhaust gas recirculation (EGR) pump arranged in said exhaust gas recirculation duct, the internal combustion engine system having a normal operation mode for transporting, by means of the EGR pump, at least a portion of said exhaust gas from said first point to said second point, and characterized in that said method comprising the steps of:

• determining a temperature of one or more exhaust aftertreatment devices of said EATS,
• comparing said determined temperature with a predetermined threshold value;
• and
• if said determined temperature is below said predetermined threshold value, running said internal combustion engine system in a pre-heat operation mode such that exhaust gas and/or air passes, by means of the EGR pump, through a heating device arranged upstream of at least one of said exhaust aftertreatment devices of said EATS and then to said at least one of said exhaust aftertreatment devices.