Patents by Inventor Stefan D. Peter

Stefan D. Peter has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for regenerating a nitrogen oxides storage catalyst
    Patent number: 7351677
    Abstract: The present invention provides a process and a device for regeneration of a nitrogen oxide storage catalyst in the exhaust system of a diesel engine. The process comprises a first and a second regeneration strategy. The first regeneration strategy is applied when the exhaust gas temperature is above a threshold value and comprises changing the air/fuel-ratio from a lean to a rich value during a first regeneration period. The second regeneration strategy is applied when the exhaust gas temperature is below a threshold value and comprises switching the air/fuel-ratio back and forth between lean and rich air/fuel-ratios, forming a sequence of between 2 and 10 rich pulses and between 2 and 10 lean pulses during a second regeneration period.
    Type: Grant
    Filed: July 29, 2003
    Date of Patent: April 1, 2008
    Assignee: Umicore AG & Co. KG
    Inventors: Friedemann Rohr, Peter Kattwinkel, Stefan D. Peter, Thomas Kreuzer, Egbert Lox
  • Process for regenerating a nitrogen oxides storage catalyst
    Publication number: 20040055285
    Abstract: The present invention provides a process and a device for regeneration of a nitrogen oxide storage catalyst in the exhaust system of a diesel engine. The process comprises a first and a second regeneration strategy. The first regeneration strategy is applied when the exhaust gas temperature is above a threshold value and comprises changing the air/fuel-ratio from a lean to a rich value during a first regeneration period. The second regeneration strategy is applied when the exhaust gas temperature is below a threshold value and comprises switching the air/fuel-ratio back and forth between lean and rich air/fuel-ratios, forming a sequence of between 2 and 10 rich pulses and between 2 and 10 lean pulses during a second regeneration period.
    Type: Application
    Filed: July 29, 2003
    Publication date: March 25, 2004
    Inventors: Friedemann Rohr, Peter Kattwinkel, Stefan D. Peter, Thomas Kreuzer, Egbert Lox