公开(公告)号：US20200072109A1

公开(公告)日：2020-03-05

申请号：US16466473

申请日：2016-12-16

Applicant: VOLVO TRUCK CORPORATION

Inventor： Fredrik Blomgren ,  Soran Shwan ,  Mathias Magnussson

IPC: F01N3/20 ,  F01N13/00 ,  F01N3/10 ,  B01D53/94 ,  B01J29/072 ,  B01J23/22 ,  B01J23/04

Abstract: The invention provides an exhaust gas treatment system (8) arranged to receive exhaust gases from an internal combustion engine (6), the system comprising an exhaust conduit (10) and a selective catalytic reduction (SCR) catalyst (12) provided in the exhaust conduit (10), characterized in that the system comprises a nitrogen dioxide reducing unit (701) provided in the exhaust conduit (10) upstream of the SCR catalyst (12), wherein the nitrogen dioxide reducing unit (701) is adapted to reduce, at a low temperature, nitrogen dioxide (NO2) in exhaust gases received by the nitrogen dioxide reducing unit (701).

公开(公告)号：US10060320B2

公开(公告)日：2018-08-28

申请号：US15106193

申请日：2013-12-19

Applicant: VOLVO TRUCK CORPORATION

Inventor： Fredrik Blomgren ,  Johan Dahl

IPC: F01N3/20 ,  F01N11/00

Abstract: A system is provided for determining a parameter indicative of an amount of a reducing agent in a selective catalytic reduction (SCR) module of a vehicle, the system including: the SCR module having at least one passage for transporting a stream of gas and an SCR catalyst for converting NOx emissions, and having an extension in an axial direction, at least one first antenna unit configured to transmit and receive a microwave signal. Moreover, the first antenna unit is arranged outside the SCR module and configured to transmit microwave signals towards the SCR catalyst and to receive a microwave signal reflected within the SCR module. The system further includes processing circuitry connected to the first antenna unit and configured to determine a difference between the transmitted microwave signal and the received reflected microwave signal and to determine a parameter indicative of the amount of a reducing agent in the SCR catalyst based on the determined difference between the transmitted microwave signal and the received reflected microwave signal. Moreover, the invention relates to a method for determining a parameter indicative of an amount of a reducing agent in a system of a vehicle.