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Method for operating a sensor for detecting at least a portion of a measurement gas component having bound oxygen in a measurement gas

A technology that operates sensors, gas components, and is used in measurement devices, material analysis by electromagnetic means, instruments, etc.

Pending Publication Date: 2021-02-19
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Despite the advantages of the sensors and methods for operating them known from the prior art, they still contain potential for improvement

Method used

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  • Method for operating a sensor for detecting at least a portion of a measurement gas component having bound oxygen in a measurement gas
  • Method for operating a sensor for detecting at least a portion of a measurement gas component having bound oxygen in a measurement gas
  • Method for operating a sensor for detecting at least a portion of a measurement gas component having bound oxygen in a measurement gas

Examples

Experimental program
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Embodiment Construction

[0035] figure 1 The principle structure of a sensor 100 according to the invention is shown which is particularly suitable for carrying out the method according to the invention.

[0036] The sensor 100 is provided for ascertaining at least one fraction of a gas mixture, for example the exhaust gas of an internal combustion engine, of a measured gas component with bound oxygen, referred to below by way of example as nitrogen oxides NOx, for which the sensor element 110 comprises a first The pump unit 112 is formed between the outer pump electrode 114 and the inner pump electrode 116 . In this case, the outer pump electrode 114 , which is separated from the surroundings of the sensor 100 by means of a porous aluminum oxide layer 118 , has a first electrically conductive connection 120 via which a first pump can be generated in the first pump unit 112 . Current I P1 . To this end, the first electrically conductive connection 120 is connected to a first connection P1 of an ext...

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Abstract

The invention relates to a method for operating a sensor (100) for detecting at least a portion of a measurement gas component having bound oxygen in a measurement gas, more particularly in an exhaustgas of an internal combustion engine. In the method, an electronic control unit (122), which at least has a first separate connection point (P1) for a first pumping cell (112), a second separate connection point (P2) for a second pumping cell (140), a connection point for a Nernst voltage (Vs) and a common connection point (COM), is connected to the sensor element (110) of the sensor (100), a measurement resistor (160) being provided in a fourth electrically conductive connection (146), a predefined voltage (UCOM) being present at the common connection point (COM), the predefined voltage (UCOM) being changed for a predefined time by means of the control unit (122) in order to generate a measurement signal (174).

Description

technical field Background technique [0001] Various methods and sensors are known from the prior art for proving at least one fraction of a measuring gas component with bound oxygen in a gas mixture, in particular in the exhaust gas of an internal combustion engine, by sensing the fraction of oxygen which Oxygen is produced by the reduction of the measured gas component. [0002] Sensors for proving at least one fraction of the measured gas component with bound oxygen in the gas mixture, for example in Reif, K., Deitsche, K-H. et al., Handbook of Motor Driving Technology, Springer Vieweg, Wiesbaden, 2014, 1339- 1347, the sensor is also abbreviated or abbreviated as NO X sensor or nitrogen oxide sensor. [0003] Nitrogen oxide sensors (NOx) currently used in automotive technology X sensors) function according to the boundary current principle similar to oxygen sensors, eg lambda sensors. This nitrogen oxide sensor consists of a Nernst concentration cell also known as a re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/419
CPCG01N27/4175
Inventor P·厄克特灵M·海泽M·盖尔M·菲德勒A·施罗德M·辛格D·迪克
Owner ROBERT BOSCH GMBH