Patent ID: 11946427
Assignee: VOLVO TRUCK CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 13:
14. A method for controlling the operation of an engine system in a vehicle, the engine system comprising an engine configured to operate in at least a two-stroke combustion mode and a four-stroke combustion mode, and an exhaust aftertreatment system, EATS configured to reduce emissions from the engine exhausts, the method comprising:
estimating or predicting the temperature of the EATS;
estimating or predicting the emissions out of the EATS;
in response of that the temperature of the EATS is below a predetermined temperature threshold, and that the emissions out of the EATS is above a predetermined emission threshold, performing a primary NOx emission reducing activity by operating the engine in a two-stroke combustion mode, and deactivating at least one engine cylinder of the engine during the operation of the engine in a two-stroke combustion mode wherein the deactivated engine cylinder is controlled to perform engine compression brake, either as two-stroke or four stroke engine compression brake;
subsequently to initiating the operation of the engine in a two-stroke combustion mode, and in response of that the emissions out of the EATS is below the predetermined emission threshold, changing engine operation from the two-stroke combustion mode to a four-stroke combustion mode.