The present disclosure relates to engine exhaust aftertreatment systems, and more particularly to the regeneration of a diesel particulate filter. A controller (71) is used to switch the power system (1), in which the aftertreatment system is used, from a first operation mode into a second operation mode to regenerate the particulate filter (54). The transition from the first to the second operation mode is made in response to a change in load on the engine (10) and a threshold amount of time greater than zero has passed after the change in load on the engine (10).
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