| Patent application number | Description | Published |
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| 20080245666 | Sensor Element and Method for Determining the Concentration of Gas Components in a Gas Mixture - A sensor element for the determination of the concentration of gas components in a gas mixture, particularly of the concentration of gas components in the exhaust of internal combustion engines, with two electrode, that together with a solid electrolyte constitute a pumping cell, whose outer pumping electrodes is exposed to the gas mixture by way of a porous protective layer, and with a reference electrode, which is disposed on the solid electrolyte and is exposed to a reference gas, and which with a solid electrolyte and a Nernst electrode constitutes a concentration or Nernst cell, is thereby characterized in that at least periodically the Nernst voltage between the outer pumping electrode and the Nernst electrode is tapped and analyzed. | 10-09-2008 |
| 20080289961 | Sensor Element - A sensor element for determining the oxygen concentration in an exhaust gas has a conductor track applied to a solid electrolyte, which includes an electrode provided in a measuring area of the sensor element and an electrode lead connected to the electrode and situated in the lead area of the sensor element. In a transition area between the measuring area and the lead area, the conductor track has a narrowing. Furthermore, the electrode includes a first electrode section and a second electrode section, the first electrode section being connected to the electrode lead in a transition area between the measuring area and the lead area, and the first and second electrode sections being electrically connected to one another only on their sides facing away from the lead area. | 11-27-2008 |
| 20080296156 | SENSOR ELEMENT FOR DETERMINING A PHYSICAL PROPERTY OF A MEASURING GAS - 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. %. | 12-04-2008 |
| 20090038941 | Device for Determining the Concentration of a Component in a Gas Mixture - In an apparatus that ascertains a concentration of a component in a gas mixture, the apparatus includes:
| 02-12-2009 |
| 20090095627 | SENSOR FOR MEASURING THE CONCENTRATION OF A GAS COMPONENT IN A GAS MIXTURE - Disclosed is a sensor for measuring the concentration of a gas component in a gas mixture. Said sensor comprises a solid electrolyte and electrodes which are separated from each other by means of the solid electrolyte and of which an outer electrode is exposed to the gas mixture while an inner electrode is disposed in a hollow space that is separated from the gas mixture with the aid of a diffusion barrier. The inventive sensor is characterized in that an additional outer electrode is exposed to the exhaust gas, said additional outer electrode being impinged upon by a current whose sign is the opposite of the current by which the outer electrode is impinged upon. | 04-16-2009 |
| 20090107839 | GAS SENSOR - The invention relates to a gas sensor for determining the oxygen concentration in a gas mixture, especially in the exhaust gas of internal combustion engines. Said gas sensor comprises a pump cell having an outer pump electrode, exposed to the gas mixture, and an inner pump electrode, exposed to the gas mixture via a diffusion barrier, and a solid electrolyte body interposed between the outer pump electrode and the inner pump electrode. The gas sensor also has a reference electrode, exposed to a reference gas, and a sensor heating device. The outer pump electrode is connected to a circuit arrangement via a pump current line, the inner pump electrode via a measuring line, the reference electrode via a reference current line and the sensor heating device via two heating lines. The invention is characterized in that the pump current line and one heating line are electrically interconnected and grounded, the pump current can be supplied via the measuring line and the Nernst voltage can be tapped between the measuring line and the reference pump current line and the reference pump current flows from the reference electrode to the outer pump electrode. | 04-30-2009 |
| 20090116534 | METHOD FOR OPERATING A GAS SENSOR - The invention relates to a method for operating a sensor, in particular a sensor made of ceramic material. Said sensor is heated to a shock-resistance temperature which is higher than a specific temperature. | 05-07-2009 |
| 20090152112 | GAS SENSOR - Disclosed is a gas sensor, particularly a lambda probe, for determining the oxygen concentration in the exhaust gas of an internal combustion engine that is operated using a fuel-air mixture. Said gas sensor comprises a pump cell with an outer electrode that is exposed to the exhaust gas, an inner electrode located in a measuring chamber which is separated from the exhaust gas by means of a first diffusion barrier, and an electronic circuit for generating a voltage applied between the outer electrode and the inner electrode as well as for measuring and evaluating a pump current that is generated in said process in order to draw a conclusion therefrom about the composition of the fuel-air mixture. The inventive gas sensor is characterized in that the outer electrode is arranged in an independent measuring volume which is separated by means of an additional, second diffusion barrier whose coefficient of diffusion is different from that of the first diffusion barrier while the circuit is configured so as to preferably repeatedly reverse the polarity of the voltage. | 06-18-2009 |
| 20090152130 | Gas sensor and method for detecting particles in a gas flow - A gas sensor 10 for detecting particles in a gas stream has a first electrochemical pump cell 14, which has a measuring chamber 16 in which a first electrode 18 is disposed to pump particles between the first measuring chamber 16 and the gas stream. Furthermore, a second electrochemical pump cell 20 is provided, which has a second measuring chamber 22 in which a second electrode 24 is disposed so as to pump particles. According to the invention, the second measuring chamber 22 is connected to the gas stream via an absorber medium 34 for absorption of the particles to be detected. This makes it possible to absorb the particles to be detected in a first operating mode using the absorber medium 34, and to desorb the absorbed particles in a second operating mode, and to detect the quantity of the desorbed particles. Thus, the gas sensor 10 is able to take even low concentrations into account, and short-term measuring errors do not have such a serious effect. | 06-18-2009 |
| 20090217737 | Sensor Element for Gas Sensors and Method for Operating Same - A sensor element is provided for gas sensors, in particular to determine particles in gas mixtures, the sensor element including at least one electrochemical measuring element exposed to the gas mixture to be determined, and at least one temperature-measuring element integrated into the sensor element. The temperature-measuring element includes a resistor track, which has an electric resistance of less than 180 Ohm at 0° C. The resistor track may thus be produced by thin-foil technology, such as screen printing, for example. | 09-03-2009 |
| 20090308135 | METHOD FOR DETERMINING THE TEMPERATURE OF A MEASUREMENT SENSOR - A method for determining the temperature of a measurement sensor for determining an oxygen concentration in gas mixtures, in particular in exhaust gases of internal combustion engines, wherein a detection voltage which corresponds to the oxygen concentration and is provided by a Nernst measuring cell is evaluated, and the measurement sensor is regulated to an operating temperature using a heating device, is characterized in that the internal resistance of the Nernst measuring cell is determined in a first temperature range and is used to infer the temperature of the Nernst measuring cell, and in that the internal resistance of the heating device is determined in a second temperature range and is used to infer the temperature of the Nernst measuring cell. | 12-17-2009 |
| 20090308748 | SENSOR ELEMENT HAVING IMPROVED THERMALPROPERTIES FOR DETERMINING A GAS COMPONENT - A sensor element for determining a gas component in a measuring gas includes a first and a second electrode, a solid electrolyte situated between the electrodes, a heater having a heating element, and an insulation surrounding the heating element, wherein the heating element has a meander pattern having a first external heating area, a second external heating area, a first internal heating area, and a second internal heating area. | 12-17-2009 |
| 20100000864 | GAS SENSOR WITH PUMP CELL AND ADDITIONAL OUTER ELECTRODE - The invention relates to a gas sensor, especially a lambda probe, for determining the oxygen concentration in the exhaust gas of an internal combustion engine that is operated with a fuel/air mixture. Said gas sensor comprises a pump cell arranged in or on a sensor element, said pump cell having a first electrode and a second electrode that are separated from the exhaust gas by at least one layer, and an electronic circuit for producing a voltage applied between the first electrode and the second electrode and for measuring and evaluating a pump current thereby produced in order to make it possible to draw conclusions therefrom on the composition of the fuel/air mixture. The invention is characterized in that an additional outer electrode is arranged on the sensor element. Said additional electrode is exposed to the exhaust gas and supplied with a negative current. | 01-07-2010 |
| 20100077836 | METHOD FOR OPERATING AN EXHAUST GAS SENSOR AND DEVICE FOR CARRYING OUT THE METHOD - A method for operating an exhaust gas sensor, which has at least two electrodes, between which a pump current flows and between which a pump voltage occurs, said sensor being operated with a nominal operating temperature and a low temperature operation being intermittently provided at said sensor, wherein the temperature of the exhaust gas sensor is less with respect to the nominal operating temperature, and a device for carrying out the method are proposed. Provision is made according to the invention for the pump voltage to be acquired and for the low temperature operation to be influenced by the pump voltage. | 04-01-2010 |
| 20100126883 | SENSOR ELEMENT HAVING SUPPRESSED RICH GAS REACTION - A sensor element for determining at least one physical property of a gas mixture is provided. The sensor element has at least one first electrode and at least one second electrode, and at least one solid electrolyte that connects the at least two electrodes. The at least one first electrode is connected via at least one diffusion-resistance element to the at least one gas chamber and/or to at least one reference chamber. The at least one second electrode is connected via at least one flow-resistance element to the at least one gas chamber. The at least one flow-resistance element and the at least one diffusion-resistance element are designed in such a way that the limit current of the at least one first electrode is smaller than the limit current of the at least one second electrode. | 05-27-2010 |
| 20100180668 | SENSOR ELEMENT OF A GAS SENSOR - A sensor element for determining a gas component or particles in a measuring gas, having a first and a second measuring electrode, the measuring electrodes being developed as interdigital electrodes having a row of intermeshing branches as well as a main conductor each, to which the branches are connected in an electrically conducting manner; and the branches of the interdigital electrodes being aligned essentially in parallel to a longitudinal axis of the sensor element. | 07-22-2010 |
| 20110030664 | METHOD AND DEVICE FOR DETERMINING THE COMPOSITION OF A FUEL MIXTURE - The invention relates to a method and device for determining the composition of a fuel mixture made of one first fuel and at least one second fuel for operating an internal combustion engine, wherein said internal combustion engine has a fuel metering apparatus and at least one exhaust gas probe in an exhaust gas channel. According to the method of the invention, it is provided that the fuel mixture is at least temporarily supplied to the exhaust gas probe at least partially uncombusted, and the composition of the fuel mixture is determined from an output signal of the exhaust gas probe. According to the device of the invention, it is provided that the exhaust gas probe is situated proximal to the motor in the direction of the exhaust gas flow before a first catalytic converter, and the fuel mixture can be supplied at least partially uncombusted to the exhaust gas probe at least temporarily. The method allows the precise and reliable determination of the composition of a fuel mixture in internal combustion engines operated in flex fuel operation existing components. | 02-10-2011 |
| 20110056270 | SENSOR ELEMENT HAVING AN INNER ANODE - A sensor element, which may be used as Lambda probe and/or inside a Lambda probe, for example, is provided for determining at least one physical property of a gas mixture in at least one gas chamber. The sensor element has at least one first electrode, at least one second electrode and at least one solid state electrolyte, which connects the at least one first electrode and the at least one second electrode. The at least one first electrode and the at least one second electrode are situated inside the sensor element. The at least one second electrode is connected to at least one reference gas chamber via at least one discharge air channel. | 03-10-2011 |
| 20110108419 | HEATED BISTABLE SENSOR HAVING SIMPLIFIED ELECTRICAL CONTACTING - A sensor element for determining a physical property of a gas in a measuring gas chamber includes at least two electrodes, at least one solid-state electrolyte connecting the electrodes, and at least one heating element having at least two heating contacts. A first heating contact and a first electrode are contacted via a common connecting line, and a second heating contact and a second electrode are connected to a common ground line. | 05-12-2011 |
