Patents by Inventor Juergen Hoermann

Juergen Hoermann 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).

  • Intermediate circuit with a first switch for switching a fuel cell stack and second switch for short-circuting the fuel stack, fuel cell system with an intermediate circuit, and method for controlling the intermediate circuit
    Patent number: 8206861
    Abstract: An intermediate circuit for controlling the connection of a fuel cell stack to a load bus includes three switching elements arranged in a pi configuration. At least one such switching element is provided for short circuiting either or both of the fuel cell stack and the load bus, while a further switching element controllably interrupts the line connection between the fuel cell stack and the load bus. The respective switches are driven according to a control method that accommodates start-up operation, switch-off operation, emergency shut down, and a self diagnostic mode.
    Type: Grant
    Filed: June 3, 2006
    Date of Patent: June 26, 2012
    Assignee: Daimler AG
    Inventors: Markus Aberle, Juergen Hoermann
  • Monitoring apparatus for a fuel cell stack
    Patent number: 8088532
    Abstract: A control apparatus for a fuel cell stack having an operation control module is provided. The operation control module is configured in terms of programming and circuitry in order to control a large number of sensor or actuator systems that are relevant to normal operation. The sensor or actuator systems relate to the operating state of the fuel cell stack during normal operation and have a safety control module that is designed in terms of programming and circuitry to control safety-relevant sensor or actuator systems. The safety-relevant sensor or actuator systems relate to the safety functions of the fuel cell stack and the safety control module is in the form of an assembly which operates autonomously with respect to the operation control module. A method for controlling the fuel cell stack and the operation control module is also provided.
    Type: Grant
    Filed: May 4, 2006
    Date of Patent: January 3, 2012
    Assignee: Daimler AG
    Inventors: Werner Belschner, Matthias Kugel, Juergen Leitz, Ralf Mueller, Juergen Hoermann
  • Monitoring Apparatus for a Fuel Cell Stack
    Publication number: 20100009227
    Abstract: A control apparatus for a fuel cell stack having an operation control module is provided. The operation control module is configured in terms of programming and circuitry in order to control a large number of sensor or actuator systems that are relevant to normal operation. The sensor or actuator systems relate to the operating state of the fuel cell stack during normal operation and have a safety control module that is designed in terms of programming and circuitry to control safety-relevant sensor or actuator systems. The safety-relevant sensor or actuator systems relate to the safety functions of the fuel cell stack and the safety control module is in the form of an assembly which operates autonomously with respect to the operation control module. A method for controlling the fuel cell stack and the operation control module is also provided.
    Type: Application
    Filed: May 4, 2006
    Publication date: January 14, 2010
    Inventors: Werner Belschner, Matthias Kugel, Juergen Leitz, Ralf Mueller, Juergen Hoermann
  • Intermediate Circuit, Fuel Cell System Having the Intermediate Circuit, and Method for Controlling the Intermediate Circuit
    Publication number: 20090325003
    Abstract: An intermediate circuit for controlling the connection of a fuel cell stack to a load bus includes three switching elements arranged in a pi configuration. At least one such switching element is provided for short circuiting either or both of the fuel cell stack and the load bus, while a further switching element controllably interrupts the line connection between the fuel cell stack and the load bus. The respective switches are driven according to a control method that accommodates start-up operation, switch-off operation, emergency shut down, and a self diagnostic mode.
    Type: Application
    Filed: June 3, 2006
    Publication date: December 31, 2009
    Inventors: Markus Aberle, Juergen Hoermann