Patents by Inventor Hanns Hoffmann

Hanns Hoffmann 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: 6227180
    Abstract: In an arrangement and method for controlling a supercharged internal combustion engine having a charger arranged in the air intake duct and a catalytic converter arranged in the exhaust duct, with a secondary air duct including a control valve extending from a point of the intake duct downstream of the charger and upstream of a first throttle member to a point of the exhaust duct upstream of the catalytic converter, a second throttle member is arranged in the intake duct upstream of the charger and the throttle members and control valve are controlled by a control unit in such a way that sufficient air is supplied to the exhaust duct upstream of the catalytic converter such that, during engine warm-up, combustion takes place in the catalytic converter causing rapid heat-up of the catalytic converter.
    Type: Grant
    Filed: August 23, 1999
    Date of Patent: May 8, 2001
    Assignee: Daimler Chrysler AG
    Inventors: Hanns Hoffmann, Wolfgang Widmann