Caterpillar Inc.

Behnaz Ensan

Sunil Jefferey Bean

James Harris Mutti

Rajesh Narayanan Nair

Timothy D Schwartz

Steven Grant

Samuel Were

Rodney L Menold

James Vernon Dornberger, Ii

Kevin Walsh

Matthew Benjamin Yandell

Hardikkumar Shah

An engine braking system includes engine braking actuators for adjusting exhaust valve timings to engine braking timings in a cylinder-number braking mode. The system further includes an engine braking controller coupled to a control switch that produces a request indicating a requested cylinder-number braking mode. The engine braking controller is structured to transition exhaust valves to the engine braking timings, determine a control term to adjust intake air pressure for varying a braking power of the engine, and to adjust geometry of an exhaust turbine based on the control term. An adjusted speed of a compressor rotated by the exhaust turbine provides a change to intake air pressure that adjusts the braking power of the engine. Different levels of braking power are provided within different cylinder-number braking modes.

Engine braking method and control system varying engine braking power within cylinder-number braking mode

A system and method for detecting pressure deviation of a first fluid in an engine is disclosed. The method may comprise calculating, for each of a plurality of measurements, a delta between an actual first fluid pressure and a target pressure, summing each delta obtained from the calculating, and determining pressure deviation of the first fluid based on a cumulative sum of the deltas. In an embodiment, the first fluid may be natural gas.

Gas pressure high and low detection

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Peoria, IL, United States of America

Behnaz Ensan