Caterpillar Motoren Gmbh & Co. Kg

Hauke Holst

Andrew Michael Denis

Eike Joachim Sixel

Arvind Sivasubramanian

Jason Hudgens

Daniel Wester

Julian Justin

Jun Zuo

Andreas Banck

Marius Wolfgramm

Thorsten Tuexen

Jan Dreves

Hendrik Johannes Lange

Kai Ruschmeyer

Eike Sixel

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 a spark ignited gaseous fuel internal combustion engine is disclosed. The engine may have at least one main combustion chamber and at least one ignition device configured to initiate an ignition event within an ignition region. The method may include supplying pressurized fuel to the ignition region at times between about 30&#xb0; to about 0&#xb0; crank angle before the ignition event is initiated by the ignition device for enriching the ignition region with fuel. The method may also include initiating an ignition event in the ignition region for combusting an enriched air/fuel mixture within the ignition region.

Ignition system for internal combustion engines

A method for controlling an internal combustion engine operating on at least partly gaseous fuel is disclosed. The method may include providing a desired burn rate profile corresponding to a desired operation of the internal combustion engine. The method may further include selecting first operating parameters such that an operation of the internal combustion engine with a first gas composition produces a first burn rate profile that corresponds to the desired burn rate profile. The method may also include operating the internal combustion engine with the first operating parameters using a second gas composition. The method may include determining that the second burn rate profile differs from the desired burn rate profile. In addition, the method may include adjusting an operating parameter from among the first operating parameters of the internal combustion engine to approach the desired burn rate profile.

Controlling an internal combustion engine operated on gaseous fuel

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Altenholz, Germany

Hauke Holst