Patents by Inventor Frank Molwitz

Frank Molwitz 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).

  • Determining the temperature of an exhaust gas sensor by means of calibrated internal resistance measurement
    Patent number: 6939037
    Abstract: For achieving a highest possible measuring accuracy of a circuit for measuring the internal resistance of an exhaust-gas sensor, a method and a circuit for measuring the internal resistance R1 (10) of an electrochemical cell (12) are provided for determining the temperature of an exhaust-gas sensor, especially of a motor vehicle. The circuit is provided with the objective to improve the control to a constant temperature to therefore also improve the performance of the exhaust-gas sensor. A measurement current I_Mess (20) is applied to the internal resistance R1 (10) of the electrochemical cell (12) and a resulting first voltage is detected. A switchover to a reference resistor R2 takes place from time to time or at regular time intervals. With a switchover to the reference resistor R2, the resulting second voltage is stored and thereafter is applied as a reference value for the measurement of the internal resistance R1 (10).
    Type: Grant
    Filed: July 6, 2002
    Date of Patent: September 6, 2005
    Assignee: Robert Bosch GmbH
    Inventors: Erich Junginger, Dietmar Blessing, Christian Zimmermann, Wilhelm Haag, Frank Molwitz, Rene Schenk, Bernd Hilgenberg, Johann Riegel
  • Determining the temperature of an exhaust gas sensor by means of calibrated internal resistance measurement
    Publication number: 20040047399
    Abstract: For achieving a highest possible measuring accuracy of a circuit for measuring the internal resistance of an exhaust-gas sensor, a method and a circuit for measuring the internal resistance R1 (10) of an electrochemical cell (12) are provided for determining the temperature of an exhaust-gas sensor, especially of a motor vehicle. The circuit is provided with the objective to improve the control to a constant temperature to therefore also improve the performance of the exhaust-gas sensor. A measurement current I_Mess (20) is applied to the internal resistance R1 (10) of the electrochemical cell (12) and a resulting first voltage is detected. A switchover to a reference resistor R2 takes place from time to time or at regular time intervals. With a switchover to the reference resistor R2, the resulting second voltage is stored and thereafter is applied as a reference value for the measurement of the internal resistance R1 (10).
    Type: Application
    Filed: September 22, 2003
    Publication date: March 11, 2004
    Inventors: Erich Junginger, Dietmar Blessing, Christian Zimmermann, Wilhelm Haag, Frank Molwitz, Rene Schenk, Bernd Hilgenberg, Johann Riegel