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Method for the functional control of a sensor for detecting particles and sensor for detecting particles

A functional inspection and sensor technology, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., to achieve the effects of improving life, reducing evaluation thresholds, and reducing evaluation limits

Active Publication Date: 2015-05-20
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, it is no longer possible to distinguish between undershooting of the threshold value due to aging or damage as of the determined aging moment

Method used

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  • Method for the functional control of a sensor for detecting particles and sensor for detecting particles
  • Method for the functional control of a sensor for detecting particles and sensor for detecting particles

Examples

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Embodiment Construction

[0032] figure 1 Shown is a sensor 10 for detecting particles, in particular soot, in a gas flow, for example an exhaust gas flow of an internal combustion engine, for installation in the exhaust gas line of a motor vehicle. Sensor 10 is designed, for example, as a soot sensor and is preferably arranged downstream of a soot filter in a motor vehicle with a diesel internal combustion engine.

[0033]The sensor 10 comprises a plate-shaped carrier layer 12 which is at least partially produced from an electrically insulating material, for example from a ceramic such as aluminum oxide. A heating element 14 is integrated in carrier layer 12 , which can be connected to a suitable voltage source via contacts 16 and serves to burn off sensor 10 of possibly deposited particles, such as soot particles.

[0034] Arranged on the carrier layer 12 is a plate-shaped substrate 18 which is at least partially produced from an electrically insulating material, for example from a ceramic such as a...

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Abstract

The invention relates to a method for the functional control of a sensor (10) for detecting particles, in particular soot, wherein the sensor (10) comprises at least two measurement electrodes (20), which are arranged on a substrate (18) consisting of an electrically insulating material, and further comprises a heating element (14). The method comprises the following steps: carrying out a first current and voltage measurement at a first temperature (42) to determine a first measurement variable, carrying out a second current and voltage measurement at a second temperature (60) to determine a second measurement variable, and forming a difference from the first measurement variable and the second measurement variable. The invention further relates to a sensor for detecting particles, which comprises at least two measurement electrodes (20), which are arranged on a substrate (18) consisting of an electrically insulating material, a heating element (14) and a control system (25). The control system (25) is designed to execute the method.

Description

Background technique [0001] Numerous methods and devices for detecting particles, such as soot or dust particles, are known from the prior art. The invention is described below without further restrictions on embodiments and applications, in particular with reference to a sensor for detecting particles, in particular soot particles, in the exhaust gas flow of an internal combustion engine. [0002] It is known from practice to measure the concentration of particles, for example soot particles or dust particles, in the exhaust gas by means of two electrodes arranged on a ceramic. This can be achieved, for example, by measuring the electrical resistance of the ceramic material separating the two electrodes. The sensor is used, for example, in the exhaust gas line of an internal combustion engine, for example a diesel internal combustion engine. The sensor is usually located downstream of the internal combustion engine or the diesel particulate filter. In the future, increased...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/06F01N11/00F02D41/00
CPCF02D41/1466F02D41/1494F02D41/222F02D2041/2086G01N15/0606G01N15/0656G01N33/0006G01R27/08Y02T10/40G01M15/102G01N27/04
Inventor B·格特纳M·克伦克K·赫韦格M·贝森
Owner ROBERT BOSCH GMBH
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