Compression release engine brake with selectively reduced engine

Details Compression release engine brake with selectively reduced engine Compression release engine brake with selectively reduced engine

1993-08-26

1994-10-25

Wolfe, Willis R.

Internal-combustion engines

Engine speed regulator

Responsive to deceleration mode

F01L 1306

Patent

active

053579267

ABSTRACT:
In order to make the use of compression release engine brakes on the internal combustion engines of vehicles more acceptable in areas (e.g., urban areas) where high levels of engine exhaust noise are undesirable, the operator of the vehicle can adjust the "lash" of the engine brake to reduce engine exhaust noise whenever desired. The "lash" of the engine brake is the "at rest" clearance between engine brake slave piston and the engine exhaust valve mechanism operated on by the slave piston to produce engine braking. Engine exhaust noise associated with engine braking is reduced by reducing this lash or clearance so the engine brake opens exhaust valves in the engine at lower engine cylinder pressures, thereby reducing the associated exhaust noise. Despite the reduced exhaust noise, the engine brake still provides a substantial amount of engine braking horsepower.

REFERENCES:
patent: 3220392 (1965-11-01), Cummins
patent: 4398510 (1983-08-01), Custer
patent: 4423712 (1984-01-01), Mayne et al.
patent: 4592319 (1986-06-01), Meistrick
patent: 5000145 (1991-03-01), Quenneville
patent: 5048480 (1991-09-01), Price
patent: 5161501 (1992-11-01), Hu
patent: 5186141 (1993-02-01), Custer

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