摘要:
A sensor for determining a concentration of gas components in gas mixtures having a first measuring electrode (mixed potential electrode) which has little or no catalytic effect on the establishment of an equilibrium in the gas mixture and a second measuring electrode (equilibrium electrode) which catalyzes the establishment of an equilibrium in the gas mixture as well as a solid electrolyte that is conductive for oxygen ions arranged between the two measuring electrodes, with the two measuring electrodes being exposed to the gas mixture. At least the first measuring electrode (16) is a cermet electrode, where at least one metal oxide component of the cermet electrode is capable of reversible incorporation of oxygen.
摘要:
A sensor element for determining different gas components in a test gas, in particular in an exhaust gas of an internal combustion engine, including a lambda sensor for determining an oxygen content in the test gas, at least one semiconductor gas sensor for determining at least one further gas component in the test gas, and a multiplexer which is connected to the semiconductor gas sensor.
摘要:
A method and a sensor element are provided for determining the concentration of an oxidizable gas in a gas mixture, e.g., in exhaust gases of internal combustion engines. Within the sensor element of a gas sensor, nitrogen oxides, hydrogen, and/or carbon monoxide contained in the gas mixture are at least partially removed in an initial step. In a further step, the concentration of the gas to be detected in the gas mixture freed of nitrogen oxides, carbon monoxide and/or hydrogen is ascertained.
摘要:
A gas sensor, particularly an ammonia sensor, having a first sensor cell that is made up of a solid electrolyte, a first measuring electrode that is to be exposed to the measuring gas and a second measuring electrode. In order to reduce an NOx cross-sensitivity of the sensor, it is distinguished by the first measuring electrode being covered by a catalytic converter for the chemical conversion of nitrogen oxides.
摘要:
A sensor element for determining a physical property of a test gas, e.g., the concentration of a gas component in a gas mixture, in particular the oxygen concentration in the exhaust gas from internal combustion engines, has a solid electrolyte body, an external electrode exposed to the test gas situated on the solid electrolyte body, an internal electrode situated in the solid electrolyte body, and an electrical resistance heater which has a meandering heating surface situated in the solid electrolyte body, and is embedded in insulation. The external electrode is situated in a cavity formed in the solid electrolyte body to reduce the heat losses from the sensor element due to convection and radiation to the cold test gas flow.
摘要:
A coating system and a method for its manufacture are provided. An electrically conductive base coat and a porous overcoat lying over the base coat are arranged on a ceramic substrate. At least one additional deposited layer is arranged on the base coat in such a way that the additional layer is formed in the pores of the porous overcoat adjacent to the base coat. The additional layer is deposited either by currentless or electrolytic deposition. For electrolytic deposition of the additional layer, the ceramic substrate sintered with the base coat and the overcoat is submerged in an electrolytic bath and the base coat is connected as a cathode. The currentless deposition takes place from a solution of the metal to be deposited with the addition of a reducing agent.
摘要:
A sensor element is used to determine a physical property of a measuring gas, which may be to determine the concentration of a component of an exhaust gas of an internal combustion engine. The sensor element includes a first electrode, which is positioned on a solid electrolyte and which is connected to the measuring gas located outside the sensor element via a first diffusion pathway, in which a first diffusion resistor is provided. The sensor element also has a second electrode, which is positioned on a solid electrolyte and is connected to the measuring gas located outside the sensor element via a second diffusion pathway, in which a second diffusion resistor is positioned. The second diffusion resistor includes a catalytically active material.
摘要:
An internal combustion engine (1), especially for a motor vehicle, is described, which has a three-way catalytic converter (12″) and a storage catalytic converter (12′) which can be loaded with and unloaded of nitrogen oxides. A diagnosis of the storage catalytic converter (12′) is carried out by a control apparatus (18) below a temperature at which the three-way catalytic converter (12″) does not yet operate.
摘要:
The invention proposes a sensing element which serves to determine the concentration of oxidizable constituents in a gas mixture, in particular of hydrocarbons, NO, and NH3. Electrically conductive spinels of the general formula ABB′O4, or electrically conductive pseudobrookites of the general formula ABB′O5, serve in this context as the material for the measurement electrode.