Valve operating system having full authority lost motion
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United States of America Patent
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Jul 31, 2001
Grant Date -
N/A
app pub date -
Nov 24, 1998
filing date -
Nov 24, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A valve actuation system for an internal combustion engine is disclosed. The system includes two hydraulic plungers (master pistons) that are selectively hydraulically coupled to a slave piston. The hydraulic motion from one of the hydraulic plungers may provide a valve opening motion to the slave piston and the hydraulic motion from the other hydraulic plunger may provide a valve closing motion. The net hydraulic motion of both hydraulic plungers may be zero, so that when both plungers have hydraulic communication with the slave piston, no slave piston motion occurs. The system may provide full authority over all engine valve actuations, such as main intake, main exhaust, compression release, and exhaust gas recirculation.
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