Caterpillar Motoren Gmbh & Co. Kg

Andreas Banck

Eike Joachim Sixel

Volker Abraham

Carsten Rickert

Michael Sturm

Hauke Holst

Markus Krueger

Jan Dreves

Marius Wolfgramm

Hendrik Johannes Lange

Stefan Haas

Werner Rebelein

Kai Ruschmeyer

Sascha Burkhard

Eike Sixel

Dirk Mooser

The present invention pertains to a system for monitoring measured NOx values in an exhaust component, comprising a first NOx sensor having a first predetermined maintenance interval and a second NOx sensor having a second predetermined maintenance interval. The first and second NOx sensors are configured such that their first and second maintenance intervals are staggered. The present invention furthermore pertains to a method for monitoring measured NOx values in an exhaust component, comprising the steps of installing a first NOx sensor having a first predetermined maintenance interval in an exhaust component installing a second NOx sensor having a second predetermined maintenance interval after the first NOx sensor has been operating for a predetermined operation duration such that the first and second maintenance intervals are staggered by a maintenance timing offset.

NOx sensor monitoring

A method for operating an engine is disclosed. The method may include supplying air from a primary air supply unit to an intake conduit. The method may also include supplying air to the engine from the intake conduit. The method may further include selectively supplying air from a secondary air supply unit to the intake conduit. In addition, the method may include maintaining an air fuel ratio between a first threshold value and a second threshold value during an increase in engine load increase by controlling a supply of air from the secondary supply unit to the intake conduit.

Method for operating an engine

A control system is disclosed for operating an internal combustion engine. The control system includes a control unit configured for providing a part load mode that is optimized for slow operation of the engine at loads up to an upper part load limit in the range from 40% to 75% of a maximum engine load. The control unit is also configured for providing a high load mode for engine loads above the upper part load limit. In the part load mode, at least one inlet valve is closed at a closing angle later than in the high load mode.

Operating internal combustion engines

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Altenholz, Germany

Andreas Banck