US 11,946,427 B2
Method for controlling the operation of an engine system
Johan Dahl, Gothenburg (SE)
Assigned to VOLVO TRUCK CORPORATION, Gothenburg (SE)
Filed by VOLVO TRUCK CORPORATION, Gothenburg (SE)
Filed on Apr. 21, 2023, as Appl. No. 18/304,456.
Claims priority of application No. 22170620 (EP), filed on Apr. 28, 2022.
Prior Publication US 2023/0349337 A1, Nov. 2, 2023
Int. Cl. F02D 41/02 (2006.01); F01N 11/00 (2006.01); F02B 37/18 (2006.01); F02D 13/04 (2006.01); F02D 41/00 (2006.01); F02D 41/30 (2006.01)
CPC F02D 41/0235 (2013.01) [F01N 11/005 (2013.01); F02B 37/18 (2013.01); F02D 13/04 (2013.01); F02D 41/0087 (2013.01); F01N 2240/16 (2013.01); F01N 2430/02 (2013.01); F01N 2430/08 (2013.01); F01N 2430/10 (2013.01); F02D 2041/0012 (2013.01); F02D 41/3058 (2013.01)] 15 Claims
OG exemplary drawing
 
1. 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:
determining predicted vehicle operational information comprising at least a predicted upcoming road event and a predicted engine operation associated with the upcoming road event,
estimating or predicting a temperature of the EATS;
estimating or predicting emissions out of the EATS, wherein the emissions out of the EATS are calculated emissions associated with the predicted engine operation;
in response to 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;
subsequently to initiating the operation of the engine in a two-stroke combustion mode, and in response to 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.
 
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.