Engine brake with controlled valve closing

Details Engine brake with controlled valve closing Engine brake with controlled valve closing

1996-10-07

1998-08-04

Wolfe, Willis R.

Internal-combustion engines

Engine speed regulator

Responsive to deceleration mode

F02D 1304

Patent

active

057878587

ABSTRACT:
An engine retarding apparatus and method include an exhaust restrictor which raises exhaust pressure in the engine high enough to cause exhaust valves to float near the beginning of each compression stroke. There is an exhaust valve blocking device which blocks closing of each exhaust valve until at least near the end of each compression stroke. In one embodiment the exhaust restrictor is an engine brake and the exhaust valve blocking device includes an hydraulic actuator controlled by a solenoid valve. There is also provided an improved exhaust brake which provides a braking effect from compression strokes as well as exhaust strokes of the pistons.

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