Claims
- 1. A method for the desulfurization of a nitrogen oxide adsorber in an exhaust gas purification device of a combustion system, comprising:
during a desulfurization phase, recording at least one of a carbon monoxide concentration and a lambda value of exhaust gas stream exiting a nitrogen oxide adsorber; and terminating the desulfurization phase when at least one of (a) a localized maximum (M) appears over time for a CO concentration and (b) a downward slope (F) appears over time for the lambda value falling from a temporary plateau value (λP) in a range of a stoichiometric value of one to a target value (λ2) for a rich exhaust gas composition.
- 2. A method according to claim 1, further comprising intermittent desulfurization phases.
- 3. A method according to claim 1, wherein the exhaust gas purification system is in a motor vehicle combustion engine.
- 4. A method according to claim 1, comprising terminating the desulfurization phase when a localized maximum (M) appears over time for a CO concentration.
- 5. A method according to claim 1, comprising terminating the desulfurization when a downward slope (F) appears over time for the lambda value, falling from a temporary plateau value (λP) in a range of a stoichiometric value of one to a target value (λ2) for a rich exhaust gas composition.
- 6. A method according to claim 1, further comprising:
generating an output signal from at least one of the carbon monoxide sensor and the lambda probe; directing the output signal to a desulfurization control unit; evaluating the output signal over time for an appearance of at least one of a localized maximum (M) of the carbon monoxide concentration and a downward slope (F), falling from a temporary plateau value (λP) in the range of the stoichiometric value one to a target value (λ2) for a rich exhaust gas composition; wherein the desulfurization control unit determines an end of the desulfurization phase depending on the time of the appearance of at least one of the localized maximum (M) of the carbon monoxide concentration and the downward slope (F) of the lambda value.
- 7. An apparatus for the desulfurization of a nitrogen oxide adsorber, comprising:
a desulfurization control unit for adjusting suitable desulfurization conditions during one or more desulfurization phases; and at least one of a carbon monoxide sensor for detecting a carbon monoxide concentration and a lambda probe for detecting the lambda value of the exhaust gas stream exiting the nitrogen oxide adsorber.
- 8. An apparatus according to claim 7, comprising a carbon monoxide sensor for detecting a carbon monoxide concentration.
- 9. An apparatus according to claim 7, comprising a lambda probe for detecting the lambda value of the exhaust gas stream exiting the nitrogen oxide adsorber.
- 10. An exhaust gas purification system comprising an apparatus according to claim 7.
- 11. A motor vehicle combustion engine comprising an apparatus according to claim 6.
Priority Claims (1)
Number |
Date |
Country |
Kind |
DE 199 28 725.2 |
Jun 1999 |
DE |
|
Parent Case Info
[0001] This application is a continuation of International Patent Application No. PCT/EP00/04086 filed on May 6, 2000 designating the United States of America, the entire disclosure of which is incorporated herein by reference. Priority is claimed based on Federal Republic of Germany patent application No. DE 199 28 725.2, filed Jun. 23, 1999.
Continuations (1)
|
Number |
Date |
Country |
Parent |
PCT/EP00/04086 |
May 2000 |
US |
Child |
10024626 |
Dec 2001 |
US |