A control system for an adjustment device for a variable compression ratio engine comprising: a jack head, a jack piston, a sprocket wheel, a movable transmission member, and a control valve. The jack piston is received within a chamber of the jack head defining first and second fluid chambers. The control valve controls the flow of fluid between the first and second fluid chambers. Based on the position of the control valve, fluid flows from the first fluid chamber to the second fluid chamber or vice versa, moving the control rack connecting the jack piston to the sprocket wheel. Reciprocating motion of the sprocket wheel adjusts the position of the cylinder of the engine.

Reference to Related Applications

This application claims one or more inventions which were disclosed in Provisional Application No. 60/819,103,, filed Jul. 7, 2006,, entitled "CONTROL METHOD FOR A VARIABLE COMPRESSION ACTUATOR SYSTEM". The benefit under 35, USC .sctn.119(e) of the U.S. provisional application is hereby claimed, and the aforementioned application is hereby incorporated herein by reference.

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