Method and a system for controlling a vehicle comprising an engine exhaust system

A computer-implemented method for controlling a vehicle comprising a combustion engine, at least one pair of drive members drivingly connectable to the combustion engine for driving the vehicle, and an engine exhaust system comprising a particulate filter, the method comprising:

• determining, by a processor device of a computer system, that a first condition is fulfilled, wherein the first condition is fulfilled at least when a downhill condition applies or is about to apply,
• determining, by the processor device, if a second condition is fulfilled, wherein the second condition is considered fulfilled if an amount of soot in the particulate filter is determined to exceed a threshold amount, and/or if a temperature at the particulate filter is determined to exceed a temperature threshold level,
• in response to determining that the first condition is fulfilled and that the second condition is not fulfilled, controlling, by the processor device, the vehicle to a first operational mode in which the combustion engine is turned off,
• in response to determining that the first condition is fulfilled and that the second condition is fulfilled, controlling, by the processor device, the vehicle to a second operational mode in which fuel is supplied to the combustion engine and in which the combustion engine is drivingly disconnected from the at least one pair of drive members.