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Sensor element having multi-part diffusion barrier

A sensor element, diffusion barrier technology, used in instruments, scientific instruments, measuring devices, etc.

Active Publication Date: 2012-05-30
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] A third challenge lies in particular in the carbon deposition and / or poisoning resistance of the sensor element

Method used

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  • Sensor element having multi-part diffusion barrier
  • Sensor element having multi-part diffusion barrier
  • Sensor element having multi-part diffusion barrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] figure 1 and 2A first exemplary embodiment of the sensor element 110 according to the invention is shown in different schematic diagrams. This is an exemplary embodiment of a broadband oxygen sensor. For further details of such broadband oxygen sensors and the mode of operation of such oxygen sensors, reference is made, for example, to the prior art already mentioned above or, for example, to DE 10 2006 062 060 A1. This is a limiting current-lean mixture sensor with a well-defined characteristic curve. The sensor element 110 has a layer structure with a first electrode 112 , a second electrode 114 and a solid electrolyte 116 , such as yttrium-stabilized zirconia, which connects the two electrodes 112 , 114 . In the exemplary embodiment shown, the two electrodes 112 , 114 are arranged in the same level. In principle, however, other arrangements are also conceivable, such as arrangements with electrodes 112 , 114 one above the other, in which the electrodes 112 , 114 ...

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Abstract

The invention relates to a sensor element (110) for determining at least one property of a gas in a measuring gas chamber (122), in particular for determining a content of a gas component in the measuring gas chamber (122). The sensor element (110) comprises at least one first electrode (112), at least one second electrode (114) and at least one solid electrolyte (116) connecting the first electrode (112) and the second electrode (114). The first electrode (112) can be supplied with gas from the measuring gas chamber (122) via a gas inlet path (124). The gas inlet path (124) comprises at least one diffusion barrier (130), which has at least one first diffusion barrier region (138) and at least one second diffusion barrier region (142). The second diffusion barrier region (142) is designed to be more fine-pored than the first diffusion barrier region (138).

Description

Background technique [0001] The invention relates to a known sensor element for determining at least one property of a gas in a measurement gas chamber. The properties can in principle be any desired properties of the gas, for example physical and / or chemical properties. In particular, the invention will be explained below with reference to a sensor element by means of which a proportion of at least one gas component in a gas can be determined, ie, for example, the partial pressure and / or concentration of this gas component, in particular oxygen. The sensor element can be used in particular to measure the air ratio λ in the exhaust gas of an internal combustion engine. Such sensor elements are also referred to as oxygen sensors and are described, for example, in "Sensors in Motor Vehicles (Sensors in Motor Vehicles), 2007 Edition, pp. 154-159" by the company Robert Bosch GmbH. Reference can be made to the explanations there by way of example, and the described sensor element...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/419
CPCG01N27/419
Inventor H.伦格
Owner ROBERT BOSCH GMBH
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