Internal-combustion engines – Poppet valve operating mechanism – Hydraulic system
Patent
1993-12-17
1994-12-20
Cross, E. Rollins
Internal-combustion engines
Poppet valve operating mechanism
Hydraulic system
123 9015, F01L 902
Patent
active
053738179
ABSTRACT:
A electrohydraulic engine valve control system in a four valve per cylinder engine wherein each of pair of intake and/or exhaust valves in each cylinder is hydraulically controlled by a separate set of solenoid valves. Each engine valve includes a piston subjected to fluid pressure acting on surfaces at both ends with the volume at one end connected to a source of high pressure fluid while a volume at the other end is selectively connected to a source of high pressure fluid and a source of low pressure fluid, and disconnected from each through action of the solenoid valves. Each pair of corresponding valves is linked hydraulically together and my be moved in unison or one may have reduced travel relative to the other via a valve deactivator, including one valve being completely deactivated. This difference in travel between the pair of valves accounts for various engine operating conditions and manufacturing tolerances. Equal air delivery to all engine cylinders having the aforementioned variable valve control system is assured by controlling electric pulses of variable duration and timing along with actuation of the valve deactivator.
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Levin Michael B.
Schechter Michael M.
Cross E. Rollins
Ford Motor Company
Lo Weilun
May Roger L.
Wilkinson Donald A.
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