Robert Boschgmbh

Mathias Klenk

Henrik Schittenhelm

Holger Scholzen

Benjamin Gaertner

Karola Herweg

Bernhard Kamp

Enno Baars

Andy Tiefenbach

Michael Bessen

Carolin Maria Schilling

Ariel Di Miro

Maik Thiele

Bastian Roetzler

Felix Guenther

Juergen Krueger

Johannes Grabis

Alexander Hetznecker

Dorothea Welke

Manuel Marks

Oliver Glock

A method for operating an exhaust gas sensor in an exhaust system of an internal combustion engine of a vehicle. The exhaust gas sensor includes a ceramic sensor element having at least one measuring electrode and a heating device. A binary dewpoint end signal is calculated, based on data which relate to the internal combustion engine and the exhaust gas sensor, which indicates whether or not the occurrence of liquid water in the exhaust system is still to be expected. Whenever the vehicle is turned off and the dewpoint end signal simultaneously has the value which signals that the occurrence of liquid water in the exhaust system is still to be expected, the sensor element is heated by its heating device to a temperature for a certain period of time in such a way that the sensor element dries.

Method for operating an exhaust gas sensor

A method for evaluating the functionality of a ceramic sensor for detecting soot, the sensor including two measurement electrodes exposable to an exhaust and spaced apart from one another, and an electrical resistance heating element. The method includes: activating the resistance heating element to heat up the sensor and to burn soot off the two measurement electrodes; then deactivating the resistance heating element; then waiting for a first predetermined time period and/or waiting until a signal that is received from the sensor and represents the sensor temperature reaches a first predefined value; then measuring a first variable representing the electrical resistance between the measurement electrodes; then evaluating the functionality of the sensor based on the first variable representing the electrical resistance between the measurement electrodes.

Method for assessing the operatability of a sensor for detecting soot

A resistive particle sensor is described for detecting soot in the exhaust gas of an internal combustion engine, including a sensor element having two strip conductors, which extend spaced apart in meanders in parallel to one another in an area of the sensor element that may be exposed to the exhaust gas, and a resistance strip conductor, the two strip conductors each being capacitively connected via capacitor elements to the resistance strip conductor.

Resistive particle sensor

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

A method is described for diagnosing an exhaust gas sensor which is situated in the exhaust gas area of an internal combustion engine for the purpose of detecting at least one exhaust gas component, which is heated with the aid of a sensor heater and whose temperature is detected. A device for carrying out the method is also described. The exhaust gas sensor is heated to a diagnosis starting temperature which is higher than the exhaust gas temperature; the heat output of the sensor heater is reduced or the sensor heater is completely turned off at least to the extent that the sensor temperature is able to decrease; the decreasing sensor temperature is detected; a measure for the temperature drop in relation to time is ascertained; this measure is compared with a first temperature gradient threshold value; and an error signal is provided if the temperature drop is too slow and therefore the ascertained measure for the temperature drop in relation to time does not exceed the first temperature gradient threshold value.

Method for diagnosing an exhaust gas sensor and device for carrying out the method

A method for operating a particle sensor (). The particle sensor () has at least two inter-digital electrodes () which engage one in the other and to which a sensor voltage U() is applied in order to determine loading of the particle sensor () with soot particles (). A sensor current I() across the electrodes () is measured and evaluated. In order to remove the loading with soot, a heating element () heats the particle sensor () in a regeneration phase. The method characterized in that the sensor current I() is determined, and a shunt diagnosis of the particle sensor () is carried out in accordance with the measured sensor current I().

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Tuebingen, Germany

Mathias Klenk