	US 11,859,528 B2
	Exhaust gas aftertreatment system
Håkan Sarby, Huddinge (SE); and Christer Lundberg, Rönninge (SE)
Assigned to Scania CV AB, Södertälje (SE)
Appl. No. 17/611,033
Filed by Scania CV AB, Södertälje (SE)
PCT Filed May 13, 2020, PCT No. PCT/SE2020/050487 § 371(c)(1), (2) Date Nov. 12, 2021, PCT Pub. No. WO2020/236065, PCT Pub. Date Nov. 26, 2020.
Claims priority of application No. 1950598-1 (SE), filed on May 20, 2019.
Prior Publication US 2022/0298943 A1, Sep. 22, 2022
Int. Cl. F01N 3/10 (2006.01); F01N 3/20 (2006.01); F01N 13/00 (2010.01); B01D 53/94 (2006.01)

CPC F01N 3/208 (2013.01) [B01D 53/9418 (2013.01); B01D 53/9431 (2013.01); B01D 53/9477 (2013.01); B01D 53/9495 (2013.01); F01N 3/106 (2013.01); F01N 13/008 (2013.01); F01N 13/009 (2014.06); F01N 2610/146 (2013.01); F01N 2610/148 (2013.01); F01N 2900/0408 (2013.01); F01N 2900/1402 (2013.01); F01N 2900/1602 (2013.01)]

13 Claims

1. A method for controlling an exhaust gas aftertreatment system, the exhaust gas aftertreatment system comprising: a reductant dosing device; a selective catalytic reduction, SCR, device arranged downstream of the reductant dosing device; an ammonia slip catalyst arranged downstream of the SCR device; a feedback NOx sensor arranged downstream of the SCR device and upstream of the ammonia slip catalyst; and a tailpipe NOx sensor arranged downstream of the ammonia slip catalyst,

wherein the method is performed by one or more control devices and comprises:

providing an initial dosing of reductant from the reductant dosing device;

obtaining a feedback signal from the feedback NOx sensor and a tailpipe NOx signal from the tailpipe NOx sensor; and

adjusting the dosing of reductant until the feedback signal exceeds the tailpipe NOx signal by a value within a predetermined positive interval.