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Bayerische Motoren Werke Aktiengesellschaft

Dr. Ing. H.c. F. Porsche Aktiengesellschaft

Volkswagen Ag

Daimler Chrysler Ag

Paul Kueper

Jens Mueller

Stefan Peter

Christian Goerigk

Alf Degen

Roland Huss

Stefan Wessels

Michael Illek

Wulf Sebbesse

A process is suggested for checking the catalyst performance in internal-combustion engines, in which by means of detected operating parameters of the internal-combustion engine similar operating conditions are determined. It is suggested to compute from a defined number of measured exhaust gas values during a similar operating condition a statistically backed average exhaust gas value and compare it with a permissible exhaust gas value stored for this operating condition, so that a defective catalyst is recognized in the event of a deviation of the actually determined exhaust gas value from the permissible exhaust gas value.

Method of checking the performance of catalysts in internal-combustion engines

A process for monitoring the operation of a system for the aftertreatment of exhaust gas utilizes respective temperature sensors assigned to catalysts in the exhaust gas system. In addition, a sensor for detecting the NOx content in the exhaust gas is assigned to a reduction catalyst. The detected values, or functions thereof, are in each case compared with the definable reference values and when these definable limit values are exceeded, a corresponding defect information is triggered.

Process for monitoring operation of an exhaust gas treatment system

A combination of an adsorbent with a catalyst for internal combustion engines. The adsorbent-catalyst combination is built up in two or more alternating layers of zones, which are coated to be adsorbing, and zones, which are coated to have catalytic activity, and are connected in series in relation to the flow of exhaust gas. The zones having adsorbing activity are to be designed thermodynamically so that they have a lesser heat transfer than the zones having catalytic activity, so that the zones having catalytic activity have a higher support temperature than the upstream zones having adsorbing activity.

Adsorber-catalyst combination for internal combustion engines

Growing community of inventors

Wiernsheim, Germany

Paul Kueper