Robert Boschgmbh

Thomas Baumann

Bernhard Kamp

Enno Baars

Udo Schulz

Alexandre Wagner

Michael Drung

Rainer Maier

Oliver Krannich

Benedikt Alt

Herbert Schumacher

Benjamin Hagemann

Yunjie Lian

Johannes Grabis

Christoph Schweizer

Harald Koehnlein

Tobias Zolg

Fabian Straub

Evgenij Pachomow

A method for the operation of a particulate filter in an exhaust aftertreatment system of a combustion engine () with the following steps: set up () a pressure difference model, which models a measured pressure difference (&#x394;p) which drops across the particulate filter () as a function () of a volume flow ({dot over (V)}) through the particulate filter () with an offset value (a, C); measure () multiple measurement values () for the pressure difference (&#x394;p) at different volume flows ({dot over (V)}) and solve () the pressure difference model as a function of the pressure difference (&#x394;p), whereby the offset value (a, C) is also determined.

Method for operating a particulate filter in an exhaust aftertreatment system of a combustion engine

The invention relates to a method and a computer program product for identifying an absent or defective particle filter in an exhaust gas treatment system of an internal combustion engine, in particular a petrol engine, wherein in order to monitor the particle filter a pressure difference between the inlet and the outlet of the particle filter is measured and evaluated. In that context, it is provided that, depending on the operating parameters of the internal combustion engine and/or of the exhaust gas treatment system, a correlation of the measured pressure difference across the particle filter compared to an expected pressure difference for an intact reference particle filter, or a correlation of the gradient, with respect to time, of the measured pressure difference to an expected gradient, with respect to time, of the expected pressure difference for an intact reference particle filter, is determined, and that, in the event of high correlation it is concluded that a particle filter is present and intact, and in the event of low correlation it is concluded that a particle filter is absent or defective. The method makes it possible to identify an absent or defective particle filter under many operating conditions of the internal combustion engine, even in the case of very low absolute pressure differences, as is in particular the case with petrol particle filters.

Method and computer program product for diagnosing a particle filter

The invention relates to a method for operating a drive device (), which for the purpose of providing a driving torque comprises an internal combustion engine having a plurality of cylinders () that, during normal operation, supply a respective torque contribution, and at least one electric motor () operatively connected to said engine. To this end, in a diagnostic mode a cylinder-selective measurement of at least one characteristic operating variable is carried out, for which purpose in the diagnostic mode only the cylinder () to be measured is operated and the torque contributions of the remaining cylinders () are simulated by the electric motor ().

Method and device for operating an internal combustion engine

A method for the self-diagnosis of an exhaust gas probe (). The exhaust gas probe () has at least one heating element (). The method includes a modeled heat output PH is determined for the heating element () by means of a computer program comparing parameters of the gas stream with a measured heat output, and determining, when the parameters of the gas stream exceeds the measured heat output by more than a defined tolerance limit, that one of the exhaust gas probe () is defective, and an exhaust gas section () in which the exhaust gas probe () is installed is faulty.

Method and apparatus for the self-diagnosis of an exhaust gas probe

A procedure for operating a particle sensor that is arranged downstream after a particle filter, at which an ash contamination can occur, and a device for implementing the procedure, are suggested. A remaining operating time determination determines the remaining operating time of the particle sensor related to an ash contamination. Alternatively or additionally the remaining operating time determination provides a correction signal, with which the sensitivity loss of the particle sensor caused by the ash contamination can be considered.

Procedure for operating a particle sensor that is arranged downstream after a particle filter and device for implementing this procedure

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Kornwestheim, Germany

Thomas Baumann