Michael David Schechter, 842080 Sawtooth Mountain Dr, Henderson, NV 89044

RE37604, Mar 26, 2002

Jan 17, 1995

08/373701

Warren F. Kaufman - Santa Ana CA
Michael M. Schechter - Farmington Hills MI

Ford Global Technologies, Inc. - Dearborn MI

F01L 902

123 9011, 123 9012, 123 9015, 137 1, 251 3001

A variable engine valve control system wherein each of the reciprocating intake and/or exhaust valves is hydraulically controlled and includes a piston subjected to fluid pressure acting on surfaces at both ends of the piston. The space at one end of the piston is connected to a source of high pressure fluid while the space at the other end is connected to a source of high pressure fluid and a source of low pressure fluid, and disconnected from each through action of controlling means such as solenoid valves. The controlling means may include a rotary hydraulic distributor coupled with each solenoid valve, thereby permitting each solenoid valve to control operation of a plurality of engine valves in succession. 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, the system involving means for making individual modifications of the durations of the electric pulses controlling each individual actuator, and the modifications being of such nature as to assure that all actuators control the engine intake (or exhaust) valves in an identical manner to assure equal valve strokes in all cylinders.