摘要:
An electrochemical sensor has a sensor element, and is used to determine a gas concentration of a gas to be analyzed. The sensor element has a first solid electrolyte layer, an electrode that includes an electrode surface and an electrode lead, and a second solid electrolyte layer; a gas channel being introduced into the first solid electrolyte layer in such a manner, that the electrode is situated in a first, clamped region between the first and the second solid electrolyte layers, and in a second, open region between the second solid electrolyte layer and the gas compartment. In a transition region between the clamped region and the open region, the electrode borders on a layer pattern, which is constructed in such a manner, that the electrode is subjected to a lower pressure during a laminating procedure.
摘要:
An electrochemical sensor for ascertaining gas concentrations in gases, particularly in exhaust gases of combustion engines, includes an oxygen-ion-conductive solid electrolyte which is provided with electrode layers arranged at a distance from one another and with at least one resistance heating element that is separated from the solid electrolyte by an electrical insulating layer, a foil binder layer being provided between the electrical insulating layer and the solid electrolyte. At least one electron-conductive intermediate layer is provided between the electrode-side electrical insulating layer and the adjacent solid electrolyte.
摘要:
An electrochemical sensor for ascertaining a gas concentration of a measuring gas includes an electrochemical element, including a first solid electrolyte body having an electrochemical pump cell and a first and a second electrode, and having a gas compartment which is connected via a gas access opening to the measuring-gas compartment, and in which one of the two electrodes is arranged. The electrochemical element further includes a second solid electrolyte body having an electrochemical sensor cell (Nernst cell) and a third and a fourth electrode. The surface of the first solid electrolyte body faces the measuring-gas compartment, and the gas access opening is covered by a porous protective layer. The electrochemical sensor includes a layer that exhibits a higher density or a lower porosity compared to the protective layer and that is allocated to the porous protective layer.
摘要:
The invention relates to an exhaust gas probe (120) for measuring properties of the exhaust gas of internal combustion engines, wherein at least one data storage unit (135) is arranged in a circuit associated with the probe, in particular arranged in a probe plug (130) or a connecting element associated therewith. The following properties and/or adaption functions characterizing the probe (120) are stored or storable in said data storage unit: —fluctuations of heating resistances that are due to the production process and/or—parameters that characterize the aging of the probe (120), and/or—the shut-off state, in particular data that characterize the execution of an interval measurement for regenerating the exhaust gas probe or of a delayed shut-off and/or—data for adapting the probe (120) to different control devices (140) of internal combustion engines and/or—the number of operating hours of the probe and/or—the operating parameters of the probe in a previous specifiable time period.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
A layered sensor element used in a gas measuring sensor for measuring a physical property of a measuring gas, preferably for determining the temperature of the measuring gas or the concentration of a component of the measuring gas. The sensor element contains a wave-form heater, which is embedded in a porous heater insulation. At least one separating element having a lower porosity than the porous heater insulation is provided between two adjacent sections of the wave-form heater.
摘要:
A sensor element for a sensor for determining the concentration of a gas component in a gas mixture, in particular the oxygen concentration in the exhaust gas of internal combustion engines, has two electrodes which, together with a solid electrolyte, form a pump cell, and one of these electrodes is exposed to the gas mixture via a porous protective layer. The sensor element also has a reference electrode which is situated on the solid electrolyte and is exposed to a reference gas. One of the two electrodes, with a reference electrode and the solid electrolyte, forms a concentration cell or a Nernst cell. To make the measured values produced by the sensor element insensitive to pressure fluctuations in the gas mixture, the electrode surface of the second electrode facing away from the solid electrolyte is coated with a finely porous diffusion layer, which is directly exposed to the gas mixture, and the second electrode is used as the reference electrode of the Nernst cell. It is also provided that the porous protective layer may be configured as a coarsely porous diffusion layer, and either of the two electrodes may be used as a reference electrode of the Nernst cell.