Patents by Inventor Katharina Renner

Katharina Renner 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 determining critical operating states in a fuel cell stack
    Patent number: 10416240
    Abstract: The invention relates to a method for determining critical operating states in a fuel cell stack, consisting of single cells connected in series, wherein a low-frequency current or voltage signal is applied to the fuel cell stack, the resulting voltage or current signal is measured and the distortion factor thd is determined. According to the invention, the weighted sum of a term dependent on the membrane resistance RM and a term dependent on the distortion factor thd is used to determine an indicator THDAdryout correlating with the drying out of the fuel cell membranes of the fuel cell stack, the membrane resistance Rm being detected by impedance measurement.
    Type: Grant
    Filed: October 18, 2018
    Date of Patent: September 17, 2019
    Assignee: AVL LIST GMBH
    Inventors: Peter Prenninger, Katharina Renner
  • Method for determining critical operating states in a fuel cell stack
    Patent number: 10345389
    Abstract: The invention relates to a method for determining critical operating states in a fuel cell stack, consisting of single cells connected in series, wherein a low-frequency current or voltage signal is applied to the fuel cell stack, the resulting voltage or current signal is measured and the distortion factor thd is determined. According to the invention, the weighted sum of a term dependent on the membrane resistance RM and a term dependent on the distortion factor thd is used to determine an indicator THDAdryout correlating with the drying out of the fuel cell membranes of the fuel cell stack, the membrane resistance Rm being detected by impedance measurement.
    Type: Grant
    Filed: October 18, 2018
    Date of Patent: July 9, 2019
    Assignee: AVL LIST GMBH
    Inventors: Peter Prenninger, Katharina Renner
  • METHOD FOR DETERMINING CRITICAL OPERATING STATES IN A FUEL CELL STACK
    Publication number: 20190049522
    Abstract: The invention relates to a method for determining critical operating states in a fuel cell stack, consisting of single cells connected in series, wherein a low-frequency current or voltage signal is applied to the fuel cell stack, the resulting voltage or current signal is measured and the distortion factor thd is determined. According to the invention, the weighted sum of a term dependent on the membrane resistance RM and a term dependent on the distortion factor thd is used to determine an indicator THDAdryout correlating with the drying out of the fuel cell membranes of the fuel cell stack, the membrane resistance Rm being detected by impedance measurement.
    Type: Application
    Filed: October 18, 2018
    Publication date: February 14, 2019
    Inventors: Peter Prenninger, Katharina Renner
  • METHOD FOR DETERMINING CRITICAL OPERATING STATES IN A FUEL CELL STACK
    Publication number: 20190049521
    Abstract: The invention relates to a method for determining critical operating states in a fuel cell stack, consisting of single cells connected in series, wherein a low-frequency current or voltage signal is applied to the fuel cell stack, the resulting voltage or current signal is measured and the distortion factor thd is determined. According to the invention, the weighted sum of a term dependent on the membrane resistance RM and a term dependent on the distortion factor thd is used to determine an indicator THDAdryout correlating with the drying out of the fuel cell membranes of the fuel cell stack, the membrane resistance Rm being detected by impedance measurement.
    Type: Application
    Filed: October 18, 2018
    Publication date: February 14, 2019
    Inventors: Peter Prenninger, Katharina Renner
  • Method for determining critical operating states in a fuel cell stack
    Patent number: 10145900
    Abstract: The invention relates to a method for determining critical operating states in a fuel cell stack, consisting of single cells connected in series, wherein a low-frequency current or voltage signal is applied to the fuel cell stack, the resulting voltage or current signal is measured and the distortion factor thd is determined. According to the invention, the weighted sum of a term dependent on the membrane resistance Rm and a term dependent on the distortion factor thd is used to determine an indicator THDAdryout correlating with the drying out of the fuel cell membranes of the fuel cell stack, the membrane resistance Rm being detected by impedance measurement.
    Type: Grant
    Filed: May 2, 2013
    Date of Patent: December 4, 2018
    Assignee: AVL LIST GMBH
    Inventors: Peter Prenninger, Katharina Renner
  • METHOD FOR DETERMINING CRITICAL OPERATING STATES IN A FUEL CELL STACK
    Publication number: 20150153418
    Abstract: The invention relates to a method for determining critical operating states in a fuel cell stack, consisting of single cells connected in series, wherein a low-frequency current or voltage signal is applied to the fuel cell stack, the resulting voltage or current signal is measured and the distortion factor thd is determined. According to the invention, the weighted sum of a term dependent on the membrane resistance Rm and a term dependent on the distortion factor thd is used to determine an indicator THDAdryout correlating with the drying out of the fuel cell membranes of the fuel cell stack, the membrane resistance Rm being detected by impedance measurement.
    Type: Application
    Filed: May 2, 2013
    Publication date: June 4, 2015
    Applicant: AVL LIST GMBH
    Inventors: Peter Prenninger, Katharina Renner