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Sensor for determining a concentration of particles in a gas flow

A particle concentration sensor technology, applied in the field of carbon black particle concentration sensor, can solve the problem of small sensor sensitivity

Active Publication Date: 2017-05-31
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, in many cases only a small part of the existing electrode structure surface on the sensor element is used to obtain a measurable signal, so that the sensor often only has a relatively low sensitivity

Method used

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  • Sensor for determining a concentration of particles in a gas flow
  • Sensor for determining a concentration of particles in a gas flow
  • Sensor for determining a concentration of particles in a gas flow

Examples

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Embodiment Construction

[0031] figure 1 A sensor 110 known from the prior art for determining the concentration of particles 112 in an air flow 114 , 14 , in particular soot particles in the exhaust gas of an internal combustion engine, is shown schematically. Here, the sensor 110 comprises a carrier element 116 and a sensor element 120 arranged on a surface 118 of the carrier element 116 , which can be exposed to the air flow 114 . The sensor element 120 has an electrode structure 122 consisting of two measuring electrodes 124 , 126 , wherein the two electrode structures 124 , 126 have different polarities from one another. It is known from the prior art that measuring electrodes 124 , 126 of electrode structure 122 are configured in the form of an interdigitated comb structure 128 with finger electrodes 130 . The finger electrodes generally have a mutual spacing 132 which is generally equidistant. In this preferred configuration, the electrode structures 122 on the sensor element 120 form a coord...

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Abstract

The invention relates to a sensor (110) for determining a concentration of particles (112) in a gas flow (114), in particular soot particles in the exhaust gas of an internal combustion engine, comprising at least one carrier element (116) and at least one sensor element (120) which is arranged on a surface (118) of the carrier element (116) and can be exposed to the gas flow (114), wherein the sensor element (120) has at least one electrode structure (122) comprising at least two measuring electrodes (124, 126) of different polarity, wherein the measuring electrodes (124, 126) are in the form of an interdigital comb structure (128) with finger electrodes (130), wherein the finger electrodes (130) are at mutual distances (132) from one another, wherein first regions (148) are at a first distance (132, 150) from the finger electrodes (130) and second regions (152) are at a second distance (132, 154) from the finger electrodes (130) in the interdigital comb structure (128), wherein the first distance (132, 150) exceeds the second distance (132, 154), wherein the first regions (148) occupy a first area on the sensor element (120) and the second regions (152) occupy a second area on the sensor element (120), wherein the first regions (148) and the second regions (152) at least partially alternately adjoin one another in each case in the interdigital comb structure (128).

Description

technical field [0001] The invention relates to a sensor for determining the concentration of particles in a gas flow, in particular the concentration of soot particles in the exhaust gas of an internal combustion engine. Background technique [0002] Sensors are known from the prior art for determining the concentration of soot particles in the exhaust tract of an internal combustion engine, in particular for monitoring diesel particulate filters. For example, DE 10 2006 032 741 A1 and DE 10 2006 029 215 A1 each describe a particle sensor having a carrier element and a sensor element arranged on the surface of the carrier element and which can be exposed to a gas flow. In this case, the carrier consists of a non-conductive, highly insulating material, in particular a ceramic made of aluminum oxide. In this case, the sensor element arranged on the surface of the carrier element has an electrode structure consisting of at least two measuring electrodes of different polarity,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/06
CPCG01N15/0656G01N2015/0046G01M15/102
Inventor S·富克斯E·巴尔斯A·蒂芬巴赫
Owner ROBERT BOSCH GMBH