Method for operating an exhaust gas after-treatment system for an internal combustion engine

Patent metadata

Field	Value
Publication number	US-2016175776-A1
Application number	US-201514970931-A
Country	US
Kind code	A1
Filing date	Dec 16, 2015
Priority date	Dec 19, 2014
Publication date	Jun 23, 2016
Grant date	—

Abstract

In a method for operating an exhaust gas after-treatment system for an internal combustion engine, the exhaust gas after-treatment system comprises at least one apparatus for generating a plasma and at least one SCR catalyst. The exhaust gas after-treatment system further comprises a device for metering a reactant for the SCR catalyst. According to the invention, the nitrogen oxides resulting from the operation of the apparatus for generating a plasma are taken into account in the method when metering the reactant for the SCR catalyst.

First claim

1 . A method for operating an exhaust gas after-treatment system for an internal combustion engine, the method comprising:
generating a plasma with a component of the exhaust gas after-treatment system; metering a reactant for an SCR catalyst based on nitrogen oxides created as a result of generating a plasma with the component of the exhaust gas after treatment system.

2 . The method according to claims 1 , wherein the nitrogen oxides created as a result of generating a plasma with a component of the exhaust gas after-treatment system are determined on the basis of an operating point of the component of the exhaust gas after-treatment system.

3 . The method according to claim 1 , wherein the nitrogen oxides created as a result of generating a plasma with component of the exhaust gas after-treatment system are determined on the basis of a characteristic model for the component of the exhaust gas after-treatment system.

4 . The method according to claim 1 , wherein the nitrogen oxides created as a result of generating a plasma with the component of the exhaust gas after-treatment system are taken into account as an additive contribution or as a correction factor during metering the reactant for the SCR catalyst.

5 . The method according to claim 1 , wherein the nitrogen oxides created as a result of generating a plasma with the component of the exhaust gas after-treatment system are taken into account as a correction for a value which represents the untreated nitrogen oxide emissions of the internal combustion engine.

6 . The method according to claim 1 , further comprising combusting, internal combustion engine, gas containing methane at least on a proportional basis with an.

7 . The method according to claim 1 , wherein the exhaust gas after-treatment system comprises at least one methane oxidation catalyst device.

8 . The method according to claim 7 , further comprising positioning the component of the exhaust gas after-treatment system upstream of the methane oxidation catalyst device.

9 . The method according to claim 7 , wherein the methane oxidation catalyst device is integrated in the component of the exhaust gas after-treatment system.

10 . The method according to claim 1 , wherein the exhaust gas after-treatment system further comprises a device for sulfur adsorption.

11 . A computer configured to control
generating a plasma with a component of the exhaust gas after-treatment system; and metering a reactant for an SCR catalyst based on nitrogen oxides created as a result of generating a plasma with the component of the exhaust gas after treatment system.

12 . A machine-readable storage medium containing computer-readable instructions that when executed by a computer cause the computer to control
generating a plasma with a component of the exhaust gas after-treatment system; and metering a reactant for an SCR catalyst based on nitrogen oxides created as a result of generating a plasma with the component of the exhaust gas after treatment system.

Assignees

• Bosch Gmbh Robert

Inventors

• Gloeckle Markus

Classifications

• Y02T10/12

  Improving ICE efficiencies · CPC title

• F01N3/208

  Control of selective catalytic reduction [SCR], e.g. by adjusting the dosing of reducing agent · CPC title

• B01D53/9431 Primary

  Processes characterised by a specific device · CPC title

• F01N2240/28

  a plasma reactor · CPC title

• Y02T10/40

  Engine management systems · CPC title