Patents by Inventor Erhard Steffen

Erhard Steffen 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 determining the opening time of an injection valve of a common-rail injection system
    Patent number: 5988143
    Abstract: In a process for determining the opening time of an injection valve of a common-rail injection system, an injection duration is derived from a characteristic diagram based on the fuel quantity to be injected and the static pressure in the common rail. For reading in the characteristic diagram, the value of the static pressure in the common rail is corrected by an amount obtained from the compressional vibration of the fuel as a function of its compressibility, the injected fuel quantity during at least one preceding injection operation, and the time between the at least one preceding injection operation and the current injection operation.
    Type: Grant
    Filed: May 15, 1998
    Date of Patent: November 23, 1999
    Assignee: DaimlerChrysler AG
    Inventors: Martin Dietz, Bernd Lindemann, Erhard Steffen