Patent ID: 11859528
Assignee: SCANIA CV AB
Field: Chemical engineering (Chemistry)
Classification: CPC B  F  Y | IPC B  F

Claim 0:
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.