Patents by Inventor Klaus-Juergen Marquartdt

Klaus-Juergen Marquartdt 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).

  • Patent number: 5845487
    Abstract: A method and an apparatus for operating an internal combustion engine, in particular a motor-vehicle diesel engine, with low nitrogen-oxide emissions, has a first mode of operation which sets an early start of fuel injection and a nitrogen-oxide reducing agent is added to the stream of exhaust gases upstream of a nitrogen-oxide-reducing exhaust-gas catalytic converter, and a second mode of operation which sets a late start of fuel injection. A temperature sensor measures the temperature of the exhaust-gas catalytic converter. The engine is operated in the second mode of operation when the measured temperature of the exhaust-gas catalytic converter lies outside a prescribable temperature range for an effective catalytic nitrogen-oxide reduction to ensure low nitrogen-oxide emissions.
    Type: Grant
    Filed: July 21, 1997
    Date of Patent: December 8, 1998
    Assignee: Daimler-Benz AG
    Inventors: Gerhard Fraenkle, Klaus-Juergen Marquartdt