Valve control apparatus and method
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United States of America Patent
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Jun 1, 1993
Issued Date -
N/A
app pub date -
Jun 29, 1992
filing date -
Oct 22, 1990
priority date (Note) -
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Abstract
A valve control apparatus particularly suited for a diesel engine brake. There is an hydraulic actuator having a piston which contacts the valve stem of an exhaust valve. The actuator is independent of the exhaust valve opening mechanism. There is a device, such as an electromagnetically activated valve, which can releasably shut off a flow of fluid from the hydraulic actuator after the exhaust valve is opened by the exhaust valve opening mechanism. The exhaust valve is prevented from closing until a flow of fluid from the hydraulic cylinder is permitted just before top dead center of the compression stroke.
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