Caterpillar Inc.

Homa Afjeh

Scott Alan Leman

Ronald Dean Shinogle

Gregory D Brock

Gerald N Coleman

Kevin Patrick Duffy

Eric Charles Fluga

James Richard Weber

Jonathan P Kilkenny

John Stephen Pipis, Jr

Edwin Henry Langewisch

Mark S Ellison

A method is disclosed for controlling compression-braking performance of an engine having a piston in a combustion cylinder. The method may include providing a valve in fluid communication with the combustion cylinder and at least one valve actuator operable to control the valve to perform compression-braking by opening the valve, which may include opening the valve to a first peak-valve-opening during a compression stroke of the piston and opening the valve to a second peak-valve-opening before a second half of an expansion stroke of the piston. The method may also include determining a target value for a stress in the at least one valve actuator. Additionally, the method may include designing the magnitude and timing of the first peak-valve-opening as a function of the target for the stress in the at least one valve actuator.

Compression-braking system

An engine valve actuation system may include an intake valve moveable between a first position that blocks a flow of fluid and a second position that allows a flow of fluid. The system may also include a cam assembly configured to move the intake valve between the first position and the second position. An electromagnetic actuator may be configured to selectively modify a timing of the intake valve in moving from the second position to the first position.

Engine valve actuation system

In one aspect, the present disclosure is directed to an internal combustion engine having an engine block defining at least one cylinder and a head connected with said engine block. The head has an air intake port and an exhaust port. The internal combustion engine also has a piston and a combustion chamber. The internal combustion engine further has an air intake valve movable to open and close the air intake port and an air supply system having at least one turbocharger fluidly connected to the air intake port. The internal combustion engine additionally has a fuel supply system operable to inject fuel into the combustion chamber, a cam assembly selectively mechanically linked to the air intake valve to move the air intake valve, and an electromagnetic actuator configured to decouple the cam assembly from the air intake valve and control movement of the air intake valve.

Air and fuel supply system for a combustion engine

A compression release brake systemincludes a hydraulic apparatusfor controllably opening at least one exhaust valveof at least one cylinderof an engine in response to motion of a cam actuator. The systemincludes a master piston assemblyhaving a master pistonengageable with the cam actuator. The master pistonincludes a compressible piston pin. A slave piston assemblyis hydraulically linked to the master piston assemblyand includes a slave pistonengageable with the at least one exhaust valve

Compression release brake system

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Dunlap, IL, United States of America

Homa Afjeh