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 |
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.
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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.
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