| 摘要 |
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.
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