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

Patent metadata

Field	Value
Publication number	US-9757692-B2
Application number	US-201514970931-A
Country	US
Kind code	B2
Filing date	Dec 16, 2015
Priority date	Dec 19, 2014
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

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

The invention claimed is:

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,
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.

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

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

4. The method according to claim 3 , further comprising positioning the component of the exhaust gas after-treatment system upstream of the methane oxidation catalyst device.

5. The method according to claim 3 , wherein the methane oxidation catalyst device is integrated in the component of the exhaust gas after-treatment system.

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

7. 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,
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.

8. 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,
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.

9. 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,
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.

10. 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.

11. 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

• F01N9/00 Primary

  Electrical control of exhaust gas treating apparatus (monitoring or diagnostic devices for exhaust-gas treatment apparatus F01N11/00; conjoint electrical control of two or more combustion engine functions F02D43/00) · CPC title

• B01D2258/01

  Engine exhaust gases · CPC title

• B01D53/944

  Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts (three-way-catalysts [TWC] B01D53/9445) · CPC title

• B01D53/323

  by electrostatic effects or by high-voltage electric fields · CPC title