Engine retarder having multiple modes

Details Engine retarder having multiple modes Engine retarder having multiple modes

2008-04-18

2009-08-04

Gimie, Mahmoud (Department: 3747)

Internal-combustion engines

Engine speed regulator

Responsive to deceleration mode

C123S320000

Reexamination Certificate

active

07568465

ABSTRACT:
The present disclosure is directed to a method of retarding an engine. The method includes selectively retarding the engine in a first mode configured to produce a first level of retarding at a first intensity of noise by selectively opening at least one exhaust valve between ninety degrees and zero degrees of an engine crank angle prior to top-dead-center of a compression stroke. The method also includes selectively retarding the engine in a second retarding mode configured to produce a second level of retarding at a second intensity of noise by maintaining an opening of at least one exhaust valve throughout the entire compression stroke.

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Jacobs Vehicle Systems, “Vehicle Noise Levels and Compression Release Engine Braking,” dtd. 2000, (4 pages).

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