Robert Boschgmbh

Benjamin Gaertner

Mathias Klenk

Andy Tiefenbach

Henrik Schittenhelm

Thorsten Ochs

Sabine Roesch

Michael Bessen

Karola Herweg

Johannes Grabis

Alexander Hetznecker

A method is provided for controlling the function of a sensor for detecting particles, in particular soot particles, the sensor including at least two measuring electrodes and a substrate on which the measuring electrodes are situated. The method includes the following: carrying out a first current-voltage measurement for ascertaining a first measured variable; carrying out a second current-voltage measurement for ascertaining a second measured variable, one measuring electrode of the measuring electrodes being applied to another electrical potential; carrying out a third current-voltage measurement for ascertaining a third measured variable; an configured forming a correction value for correcting the second measured variable with the aid of the first measured variable and the third measured variable.

Method for controlling the function of a sensor for detecting particles

A method for checking the function of a sensor for detecting soot is provided, the sensor including at least two measuring electrodes situated on a substrate made of an electrically insulating material, and a heating element, the method including: carrying out a first current-voltage measurement at a first temperature to ascertain a first measured variable, carrying out a second current-voltage measurement at a second temperature to ascertain a second measured variable, and forming a difference between the first measured variable and the second measured variable.

Method for checking the function of a sensor for detecting particles, and a sensor for detecting particles

The invention relates to a particle sensor () for determining a particle content in a gas flow, wherein the particle sensor () has, on the surface thereof, at least two interlocking interdigital IDE electrodes () and a heating element (), separated from the IDE electrodes () by an insulating layer (), by means of which heating element the particle sensor () can be heated in a regeneration phase and a soot load on the particle sensor can thus be removed, and by means of which particle sensor, in a diagnostic phase during the regeneration phase, a current is measured by intermittently applying a measurement voltage to the IDE electrodes () and, based on the chronological progression and size thereof, a functional inspection of the particle sensor () is carried out. During the regeneration phase, additional operating phases are introduced, in which, outside of the diagnostic phase (), ions are specifically moved by intermittently applying specific voltage potentials different from zero volts to the IDE electrodes ().

Method and device for operating a particle sensor

Self-diagnosis of a particle sensor may be used for determining a particle content in a gaseous stream. The particle sensor may include at least two interlocking, interdigital electrodes and a heating element. The heating element may be separated from the electrodes by an insulation layer. The particle sensor may be heated in a regeneration phase and a soot load on the particle sensor can thereby be removed. A semiconductive layer may be formed in the insulation layer directly beneath the electrodes by means of external doping or auto-doping. To perform a self-diagnosis, a measurement voltage may be applied at least periodically between the electrodes and a self-diagnostic current may be measured.

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Neureut, Germany

Benjamin Gaertner