Patents by Inventor Karl-Ernst Haak

Karl-Ernst Haak 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).

  • Method for operating a multicylinder internal combustion engine
    Patent number: 6082100
    Abstract: A method for operating a multicylinder internal combustion engine with at least one adsorber catalytic converter in the exhaust line of the internal combustion engine includes operating the adsorber catalytic converter with periodically alternating adsorption and desorption operation. The exhaust leaving the adsorber catalytic converter in desorption operation is recycled and/or an oxidation catalytic converter is provided upstream of the adsorber catalytic converter. Exhaust recycling takes place occurs selectively in only one set of the cylinders of the internal combustion engine and this set of cylinders is operated in a state of incomplete combustion during desorption operation. Rich afterburning may be performed during desorption operation of the adsorber catalytic converter in the oxidation catalytic converter connected upstream and the oxidation catalytic converter is operated at an increased temperature during short regeneration phases to remove soot.
    Type: Grant
    Filed: October 29, 1998
    Date of Patent: July 4, 2000
    Assignee: DaimlerChrysler AG
    Inventors: Walter Boegner, Frank Duvinage, Walter Friess, Karl-Ernst Haak, Bernd Krutzsch, Rudolf Maly, Viktor Pfeffer, Stefan Pischinger, Gregor Renner, Dirk Voigtlaender, Michel Weibel, Guenter Wenninger, Friedrich Wirbeleit
  • Internal combustion engine exhaust emission control system with adsorbers for nitrogen oxides
    Patent number: 5910097
    Abstract: A motor vehicle exhaust emission control system has two adsorber parts connected in parallel for alternate adsorption and desorption of nitrogen oxides contained in the exhaust from an internal combustion engine and components for conducting further downstream the exhaust that emerges in the adsorber part that is operating at any given time in the adsorption mode and for returning the exhaust that emerges from the other adsorber part that is then operating in the desorption mode, to an intake line of the engine. An oxidizing converter is located upstream of the adsorber part and near the engine for oxidation of the NO contained in the exhaust to form NO.sub.2, so as to permit an increase in the NO.sub.X adsorption rate for the nitrogen adsorber parts.
    Type: Grant
    Filed: July 17, 1997
    Date of Patent: June 8, 1999
    Assignee: Daimler-Benz Aktiengesellschaft
    Inventors: Walter Boegner, Karl-Ernst Haak, Bernd Krutzsch, Wim Verrelst, Dirk Voigtlaender, Guenter Wenninger, Friedrich Wirbeleit
  • Method and apparatus for reducing nitrogen oxides in the exhaust gas of an internal combustion engine
    Patent number: 5457958
    Abstract: In an apparatus for reducing the nitrogen oxide emission of an internal combustion engine wherein the nitrogen oxides are removed from the engine exhaust gas in an adsorber from which they are subsequently purged by hot gases, the hot gases with the nitrogen oxides purged from the adsorber are returned to the air intake of the internal combustion engine for reaction in the combustion process in the internal combustion engine in which the nitrogen oxide is converted to nitrogen and oxygen.
    Type: Grant
    Filed: June 9, 1994
    Date of Patent: October 17, 1995
    Assignee: Daimler-Benz AG
    Inventors: Walter Boegner, Karl-Ernst Haak, Bernd Krutzsch, Gunter Wonninger