Patents by Inventor Walter Strassner
Walter Strassner 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: 8240127Abstract: The invention relates to a method for the voltage-controlled performance regulation of the heating of an exhaust-gas probe in the exhaust system of an internal combustion engine. The aim of the invention is to provide a method in which the operating temperature of the probe is achieved in the shortest possible time without damage to the probe. To achieve this, the heating voltage during the heating phase of the probe is rapidly brought up to a high temperature in a start phase in relation to a subsequent phase, or a dramatic leap in temperature is achieved, preferably up to the full operating voltage and the heating voltage is then continuously or quasi-continuously reduced.Type: GrantFiled: January 27, 2006Date of Patent: August 14, 2012Assignee: Robert Bosch GmbHInventors: Thomas Wahl, Walter Strassner, Lothar Diehl, Stefan Rodewald, Juergen Sindel
-
Patent number: 7943025Abstract: A sensor element is provided for determining a physical property of a measuring gas, especially of the concentration of at least one gas component in the measuring gas, which has at least one ceramic layer, a diffusion barrier adjoining the at least one ceramic layer and at least one electrode that is exposed to the measuring gas diffusing through the diffusion barrier. In order to reduce the production variations with respect to the static pressure dependence and the limiting current of the diffusion barrier), the proportions of silicon in the diffusion barrier and in the at least one ceramic layer are approximately equal and differ by not more than 1 wt. %.Type: GrantFiled: May 30, 2008Date of Patent: May 17, 2011Assignee: Robert Bosch GmbHInventors: Christian Ohly, Walter Strassner, Joachim Graeber, Ulrich Eisele, Lothar Diehl, Thomas Seiler
-
Publication number: 20080296156Abstract: A sensor element is provided for determining a physical property of a measuring gas, especially of the concentration of at least one gas component in the measuring gas, which has at least one ceramic layer, a diffusion barrier adjoining the at least one ceramic layer and at least one electrode that is exposed to the measuring gas diffusing through the diffusion barrier. In order to reduce the production variations with respect to the static pressure dependence and the limiting current of the diffusion barrier), the proportions of silicon in the diffusion barrier and in the at least one ceramic layer are approximately equal and differ by not more than 1 wt. %.Type: ApplicationFiled: May 30, 2008Publication date: December 4, 2008Inventors: Christian OHLY, Walter Strassner, Joachim Graeber, Ulrich Eisele, Lothar Diehl, Thomas Seiler
-
Patent number: 7445699Abstract: A gas sensor for detecting at least one physical magnitude of a gas, in particular of exhaust gases of an internal combustion engine, is proposed, which includes a sensor element having an electrochemical cell. The electrochemical cell includes a first solid electrolyte member on which a first electrode and a second electrode are applied. The first and the second electrode are electrically connected by means of the first solid electrolyte member. The first electrode is in contact with the gas. The area of the first electrode is smaller than the area of the second electrode.Type: GrantFiled: October 4, 2002Date of Patent: November 4, 2008Assignee: Robert Bosch GmbHInventors: Heiner Scheer, Carsten Springhorn, Hans-Joerg Renz, Frank Haag, Walter Strassner, Lothar Diehl, Thomas Moser, Stefan Rodewald, Marten Mamey, Jürgen Karle
-
Publication number: 20080087005Abstract: The invention concerns a procedure for the voltage controlled output adjustment of a sensor heater in the exhaust gas system of an internal combustion engine. In order that such a procedure, whereby the operating temperature of the sensor is achieved in the shortest amount of time, can be implemented without the sensor being damaged in the process, provision is made according to the invention, that the heating voltage in a beginning phase of the heat-up phase of the heater is brought to a high value either very quickly in respect to a subsequent phase or precipitously brought to that high value, preferably the operating voltage; and subsequently the heating voltage is continuously or virtually continuously reduced.Type: ApplicationFiled: January 27, 2006Publication date: April 17, 2008Applicant: Robert Bosch GMBHInventors: Thomas Wahl, Walter Strassner, Lothar Diehl, Stefan Rodewald, Juergen Sindel
-
Patent number: 7117099Abstract: In a method and a control device for operating a broadband lambda sensor, the oxygen concentration of an exhaust gas is determined based on a comparison of a Nernst voltage with a reference voltage having a nominal value; a pump current is injected into a cavity of a pump cell if a deviation is present, an electric voltage present at the pump cell being regulated in such a manner that lambda=1 prevails in the cavity, the pump current being a measure for the value of lambda in the exhaust gas; and, in order to avoid control interference in the start phase of the engine or in the cold phase of the sensor, the Nernst voltage is maintained close to the reference voltage, using a pilot control, until the Nernst voltage is an actual measure for the oxygen concentration in the cavity of the pump cell.Type: GrantFiled: August 13, 2002Date of Patent: October 3, 2006Assignee: Robert Bosch GmbHInventors: Walter Strassner, Lothar Diehl, Andreas Andorfer
-
Publication number: 20060137979Abstract: A sensor element for determining gas components in gas mixtures and a method for manufacturing the sensor element are provided, the sensor element having at least one pump cell which includes a first electrode and a second electrode, the first electrode being situated in a measuring gas space of the sensor element, and the pump cell pumping oxygen into or out of the measuring gas space of the sensor element. The surface area of the second electrode is greater than that of the first electrode, and the second electrode has a diffusion barrier against the gas mixture diffusing to the second electrode, the diffusion resistance of the diffusion barrier being determined by its porosity and/or layer thickness being selected such that, given a predefined pump voltage applied to the first and second electrodes, essentially the same pump current flows between the electrodes as would flow if the diffusion barrier were not provided and both electrodes had the same surface areas exposed to the gas mixture.Type: ApplicationFiled: November 28, 2005Publication date: June 29, 2006Inventors: Walter Strassner, Lothar Diehl, Juergen Schwarz, Marcus Scheffel
-
Publication number: 20050043899Abstract: In a method and a control device for operating a broadband lambda sensor in which the oxygen concentration of an exhaust gas is determined on the basis of a comparison of a Nernst voltage with a reference voltage having a nominal value, and a pump current is injected into a cavity of a pump cell if a deviation is present, an electric voltage present at the pump cell being regulated in such a manner that lambda=1 prevails in the cavity, the pump current being a measure for the value of lambda in the exhaust gas, in order to avoid control interference in the start phase of the engine or in the cold phase of the sensor, it is provided that the Nernst voltage is maintained close to the reference voltage, using a pilot control, until the Nernst voltage is an actual measure for the oxygen concentration in the cavity of the pump cell.Type: ApplicationFiled: August 13, 2002Publication date: February 24, 2005Inventors: Walter Strassner, Lothar Diehl, Andreas Andorfer
-
Publication number: 20050034986Abstract: A gas sensor for detecting at least one physical magnitude of a gas, in particular of exhaust gases of an internal combustion engine, is proposed, which includes a sensor element having an electrochemical cell. The electrochemical cell includes a first solid electrolyte member on which a first electrode and a second electrode are applied. The first and the second electrode are electrically connected by means of the first solid electrolyte member. The first electrode is in contact with the gas. The area of the first electrode is smaller than the area of the second electrode.Type: ApplicationFiled: October 4, 2002Publication date: February 17, 2005Inventors: Heiner Scheer, Carsten Springhorn, Hans-Joerg Renz, Frank Haag, Walter Strassner, Lothar Diehl, Thomas Moser, Stefan Rodewald, Marten Mamey, Jurgen Karle
-
Patent number: 6818111Abstract: A probe is described for determining an oxygen concentration in a gas mixture, in particular in the exhaust gas of internal combustion engines, having a Nernst measuring cell, which has a first electrode (Nernst electrode) which is exposed to the gas mixture to be measured via a diffusion barrier, a second electrode (reference electrode) which is exposed to a reference gas, and a solid electrolyte body arranged between the first and the second electrode, and having a pump cell, which has a first electrode (inner pump electrode) which is exposed to the gas mixture via the diffusion barrier, a second electrode (outer pump electrode) which is exposed to the gas mixture, and a solid electrolyte body arranged between the first and the second electrode. The Nernst electrode and the inner pump electrode are connected at least in some sections via a joint supply conductor to a circuit arrangement for controlling and evaluating the probe.Type: GrantFiled: October 12, 2000Date of Patent: November 16, 2004Assignee: Robert Bosch GmbHInventors: Martin Lenfers, Walter Strassner, Johann Riegel, Lothar Diehl
-
Patent number: 6811664Abstract: A sensor element for determining the concentration of a gas component in a gas mixture, particularly for determining the oxygen concentration in exhaust gases of internal combustion engines. The sensor element includes at least one pump cell, which has at least one first pump electrode located in a measuring gas chamber and at least one second pump electrode, located on a surface of the sensor element facing the gas mixture, as well as at least one concentration cell, which has at least one reference electrode located in a reference gas chamber and at least one measuring electrode, located in the measuring gas chamber, which cooperates with the reference electrode. The measuring gas chamber and the reference gas chamber are essentially located in the same layer level (plane) of the sensor element which has a layered construction.Type: GrantFiled: October 26, 2001Date of Patent: November 2, 2004Assignee: Robert Bosch GmbHInventors: Martin Lenfers, Harry Braun, Walter Strassner, Lothar Diehl
-
Publication number: 20020166765Abstract: A sensor element for determining the concentration of a gas component in a gas mixture, particularly for determining the oxygen concentration in exhaust gases of internal combustion engines. The sensor element includes at least one pump cell, which has at least one first pump electrode located in a measuring gas chamber and at least one second pump electrode, located on a surface of the sensor element facing the gas mixture, as well as at least one concentration cell, which has at least one reference electrode located in a reference gas chamber and at least one measuring electrode, located in the measuring gas chamber, which cooperates with the reference electrode. The measuring gas chamber and the reference gas chamber are essentially located in the same layer level (plane) of the sensor element which has a layered construction.Type: ApplicationFiled: October 26, 2001Publication date: November 14, 2002Inventors: Martin Lenfers, Harry Braun, Walter Strassner, Lothar Diehl
-
Patent number: 6270639Abstract: An electrochemical sensor determining a gas concentration of the measuring gas. The sensor has an electrochemical element including a first solid electrolyte body having an electrochemical pump cell and a first (external pump) and a second (internal pump) electrode and having a gas chamber which is connected to the measuring gas chamber via a gas supply opening and in which the second electrode is arranged. The electrochemical element also includes a second solid electrolyte body having an electrochemical sensor cell (e.g., a Nernst cell) and a third and fourth electrode, each electrode having a lead for the electrical contacting. The leads of the first and second electrodes are decoupled capacitively from the lead of at least the fourth electrode by a device.Type: GrantFiled: January 29, 1999Date of Patent: August 7, 2001Assignee: Robert Bosch GmbHInventors: Martin Lenfers, Olaf Jach, Harald Neumann, Walter Strassner, Johann Riegel, Lothar Diehl
-
Patent number: 6084414Abstract: A method for testing for leakage currents in an oxygen probe, in particular a planar lambda probe, having at least one heating element, one external electrode and one internal electrode, and a solid electrolyte arranged between the electrodes, a first voltage being applied to the heating element. A second voltage is applied to at least one of the electrodes, the second voltage being selected so that the potential difference between the electrode and at least one area of the heating element is positive.Type: GrantFiled: April 16, 1998Date of Patent: July 4, 2000Assignee: Robert Bosch GmbHInventors: Harald Neumann, Walter Strassner, Lothar Diehl
-
Patent number: 5549804Abstract: The invention is directed to an arrangement for detecting the oxygen content in the exhaust gas of an internal combustion engine. The arrangement includes a concentration measuring cell operating pursuant to the Nernst principle. The concentration measuring cell has a measuring electrode, a solid electrolyte and a reference electrode and a series circuit which includes a direct voltage source and a series resistor. The series circuit connects the measuring electrode to the reference electrode. The measuring electrode communicates with the exhaust gas of the internal combustion engine and is connected to the reference electrode via the solid electrolyte. The reference electrode communicates with the reference gas volume. The reference gas volume is partitioned from the exhaust gas and from the ambient air so that a particle exchange between the reference gas volume and the exhaust gas as well as between the reference gas volume and the ambient air is at least made more difficult.Type: GrantFiled: September 30, 1994Date of Patent: August 27, 1996Assignee: Robert Bosch GmbHInventors: Gerhard Hotzel, Harald Neumann, Walter Strassner, Johann Riegel
-
Patent number: 5496461Abstract: The invention relates to a measuring sensor having an internal pump oxygen reference atmosphere which, in turn, has a device for compensating pressure which is so dimensioned that, on the one hand, mechanical damage because of overpressure in the reference volume is reliably prevented and, on the other hand, external influences on the composition of the pumped measured gas atmosphere are substantially excluded. The device for compensating for pressure is so dimensioned according to the invention that the particle exchange between ambient air and gas to be measured is opposed by a resistance which is defined by the limit current principle.Type: GrantFiled: September 30, 1994Date of Patent: March 5, 1996Assignee: Robert Bosch GmbHInventors: Gerhard Ho/ tzel, Harald Neumann, Walter Strassner, Johann Riegel
-
Patent number: 5494557Abstract: The invention is directed to a method of operating an exhaust-gas probe having a pumped reference atmosphere in a relatively closed volume. In this method, the oxygen ion current, which carries the pump current Ip to the reference atmosphere, is temporarily increased under specific conditions. In this way, an adulteration of the reference atmosphere can be more rapidly eliminated. This adulteration can occur because of fuel particles which diffuse in.Type: GrantFiled: September 30, 1994Date of Patent: February 27, 1996Assignee: Robert Bosch GmbHInventors: Gerhard Hotzel, Harald Neumann, Walter Strassner, Johann Riegel