公开(公告)号：US20210293172A1

公开(公告)日：2021-09-23

申请号：US16316318

申请日：2017-07-06

Applicant: Scania CV AB

Inventor： Mikael LUNDSTRÖM ,  Sebastian ZAMANI ,  Carl WAHLSTRÖM

IPC: F01N11/00 ,  F01N3/20

Abstract: The present invention relates to a method for diagnosing aftertreatment of exhaust gases resulting from combustion, wherein at least a first substance resulting from said combustion is reduced by supplying additive to an exhaust gas stream resulting from said combustion and use of a first reduction catalytic converter. The method includes: estimating an accumulated expected reduction of said first substance during a first period of time, determining an accumulated actual reduction of said first substance during a period of time at least substantially overlapping said first period of time, and generating a signal indicating a fault in said reduction of said first substance when said accumulated actual reduction differs from said accumulated expected reduction by a predetermined difference in occurrence of said first substance. The invention also relates to a corresponding system.