Diesel Engine Retarders, Inc.

James Judd

Richard E Vanderpoel

Mark A Israel

Kevin J Kinerson

Kristin V Emmons

An engine valve actuation system is disclosed, which is capable providing compression release engine braking in combination with exhaust gas recirculation while maintaining main exhaust and main intake valve events of constant magnitude during both positive power and engine braking. The system is also capable of providing a constant level of desired overlap between main exhaust and main intake valve events during both positive power and engine braking. The system may provide the foregoing functions by using first and second valve actuation subsystems to provide the full spectrum of exhaust valve motions. Both the first and second subsystems may receive an input motion from a valve train element. The first subsystem operates only when the engine braking system is enabled. The second subsystem operates both during positive power and during engine braking. When engine braking is enabled, the first and second subsystems work together to provide main exhaust, compression release and exhaust gas recirculation events. When the engine is in positive power mode, the second subsystem works alone, and is limited to providing main exhaust events. Methods of engine valve actuation are also disclosed.

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Ellington, CT, United States of America

James Judd