Sensor element for detecting particles of a measuring gas in a measuring gas chamber

Abstract

The invention relates to a sensor element (110) for detecting a measuring gas in a measuring gas chamber. The sensor element (110) comprises a support (112), wherein a first electrode device (114) anda second electrode device (116) are mounted on the support (112). The first electrode device (114) and a second electrode device (116) respectively comprise several electrode fingers (118), each electrode finger (118) of the first electrode device (114) being connected to at least one electrode finger (118) of the second electrode device (116) by at least one terminating resistor (120).

Description

Background technique [0001] A plurality of sensor elements are known from the prior art for sensing particles of a measurement gas in a measurement gas chamber. For example, the measurement gas can be the exhaust gas of an internal combustion engine. In particular, the particles may be soot or dust particles. The invention will be explained below in particular with reference to a sensor element for detecting soot particles, without restricting further implementation and use methods. [0002] Two or more metal electrodes can be mounted on an electrically insulating carrier. Particles, in particular soot particles, accumulating under the action of the voltage form conductive bridges between electrodes, for example in the form of interdigitated electrodes that fit into each other like a comb, during the collection phase of the sensor element, and these electrodes are thus short-circuited . During the recovery phase, the electrodes are usually burned in a self-cleaning manner ...

AI Technical Summary

Problems solved by technology

The legally required self-monitoring of the soot sensor is therefore difficult especially with regard to electrical functionality

Especially continuous monitoring, preferably at a defined minimum frequency, for example at a frequency of at least 2 Hz, is a challenge

In addition, parasitic effects, such as the impedance of the cable harness to be measured together, can make self-diagnosis difficult

Deposits with unknown electrical properties, for example on the electrode arrangement, can lead to superimposition of the desired measuring effect

In addition, known methods and / or known devices can have the disadvantage that in the event of a fault, the electrode arrangement is still partially functioning, in particular, for example still 90% functioning, even in the event of a partial fault. Also always detects a complete failure

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