US 12,246,287 B2
Method for adaption of an exhaust treatment system
Johan Lundström, Järna (SE)
Assigned to Scania CV AB, Södertälje (SE)
Appl. No. 17/791,961
Filed by Scania CV AB, Södertälje (SE)
PCT Filed Jan. 12, 2021, PCT No. PCT/SE2021/050011
§ 371(c)(1), (2) Date Jul. 11, 2022,
PCT Pub. No. WO2021/150155, PCT Pub. Date Jul. 29, 2021.
Claims priority of application No. 2050060-9 (SE), filed on Jan. 23, 2020.
Prior Publication US 2023/0037326 A1, Feb. 9, 2023
Int. Cl. B01D 53/94 (2006.01); B01D 46/00 (2022.01); F01N 3/10 (2006.01); F01N 3/20 (2006.01); F01N 13/00 (2010.01)
CPC B01D 53/9495 (2013.01) [B01D 46/0027 (2013.01); B01D 53/9409 (2013.01); B01D 53/9477 (2013.01); F01N 3/106 (2013.01); F01N 3/108 (2013.01); F01N 3/208 (2013.01); F01N 13/009 (2014.06); B01D 2255/904 (2013.01); B01D 2255/915 (2013.01); B01D 2258/01 (2013.01); B01D 2258/012 (2013.01); B01D 2279/30 (2013.01); F01N 2560/026 (2013.01); F01N 2900/16 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for adaption of an exhaust treatment system arranged for treating an exhaust stream produced by an engine, the exhaust treatment system comprising:
a first additive dosage device;
a first selective catalytic reduction catalyst arranged downstream of the first additive dosage device;
a second additive dosage device arranged downstream of the first selective catalytic reduction catalyst; and
a second selective catalytic reduction catalyst arranged downstream of the second additive dosage device,
wherein the method for adaption of the exhaust treatment system comprises:
performing an adaption of the second selective catalytic reduction catalyst to mitigate at least one of errors in the exhaust treatment system or an aging of the second selective catalytic reduction catalyst;
and
actively controlling, during the adaption of the second selective catalytic reduction catalyst, the first additive dosage device to inject additive in accordance with at least one injection rule, wherein the injection rule is designed for the adaption of the second selective catalytic reduction catalyst,
wherein when at least one of the first additive dosage device and the first selective catalytic reduction catalyst causes an inhomogeneity of a distribution of one or more compounds in the exhaust stream, the at least one injection rule is configured to cause the first additive dosage device to be controlled such that:
an impact of the inhomogeneity of the distribution of one or more compounds in the exhaust stream is limited during the adaption of the second selective catalytic reduction catalyst by controlling elements of the exhaust treatment system that may cause disturbances during the adaptation, and/or
the adaption of the second selective catalytic reduction catalyst mitigates an impact the inhomogeneity of the distribution of one or more compounds in the exhaust stream has on a function of the second selective catalytic reduction catalyst.