公开(公告)号：US20230143384A1

公开(公告)日：2023-05-11

申请号：US17802574

申请日：2021-02-26

Applicant: Scania CV AB

Inventor： David TEMPELMANN ,  Christer LUNDBERG ,  Tobias BRÄNNVALL ,  Johan LUNDSTRÖM

IPC: F01N3/20

CPC classification number: F01N3/208 ,  F01N2570/14 ,  F01N2610/02 ,  F01N2900/1821 ,  F01N2900/0418

Abstract: Disclosed is a method for use in a process of selective catalytic reduction (SCR) after-treatment of an exhaust gas of an exhaust gas stream, where the process comprises the reduction of nitrogen oxides of the exhaust gas stream through the use of a reducing agent derived from an additive. The disclosed method comprises: defining an integrand to be the difference between the rate of injection of the additive and the rate of evaporation of the additive to the reducing agent multiplied by a coefficient (s), wherein the value of the coefficient (s) is between zero and one; producing an integral controller output proportional to the integral of the integrand with time; requesting a countermeasure based on the integral controller output to counteract solid deposits derived from the additive.

公开(公告)号：US20230037326A1

公开(公告)日：2023-02-09

申请号：US17791961

申请日：2021-01-12

Applicant: Scania CV AB

Inventor： Johan LUNDSTRÖM

IPC: B01D53/94 ,  B01D46/00 ,  F01N3/20 ,  F01N3/10 ,  F01N11/00 ,  F01N13/00 ,  F01N3/035

Abstract: The present invention relates to a method for adaption of an exhaust treatment system arranged for treating an exhaust stream produced by an engine, where the exhaust treatment system includes at least 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. The method includes initiating an adaption of the second selective catalytic reduction catalyst, and 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 being designed for the adaption.