Caterpillar Inc.

Ry C Colwell

Sylvain Joseph Charbonnel

Matthew Thomas Wolk

Derek A Tanis

Michael Dean Roley

Quinton Burcar

John R McDonald

Paul R Moore

Richard Breitzman

Operating an engine includes opening and closing exhaust valves in an engine braking timing pattern, charging a first cylinder with air fed directly from an intake manifold, and releasing the directly fed air in a first braking event. Operating the engine further includes charging the first cylinder with air fed via a flow-through path through a second cylinder operating as an air conduit, and releasing the air fed through the flow-through path and pressurized to brake the engine in a second braking event. Related apparatus and valve lift profiles are also disclosed.

Engine braking strategy using cylinder flow-through path for optimizing braking power

An internal combustion engine system includes a control system with a monitoring mechanism producing data of engine operating state within a BMEP/speed envelope, and an electronic control unit structured to output a control command to vary at least one of a fuel delivery property or an air delivery property in the engine based on the data. Outputting the control command switches the engine between or among combustion modes that each satisfy different calibration criteria for optimizing aftertreatment function.

Segmented calibration for aftertreatment optimization in internal combustion engine system

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Dunlap, IL, United States of America

Ry C Colwell