Internal-combustion engines – Adjustable combustion chamber – Piston in head adjusted
Patent
1991-10-23
1993-09-28
Okonsky, David A.
Internal-combustion engines
Adjustable combustion chamber
Piston in head adjusted
123 78E, F02B 7504
Patent
active
052479110
ABSTRACT:
A compression ratio control system consists of a two-part piston forming a hydraulic chamber between the two slidable parts; their relative position, which determines the piston height, is controlled outside of the engine by regulating the pressure of engine oil going to the crankshaft and channeled to the hydraulic chamber through the crank mechanism. Piston height adjustment is accomplished incrementally by balancing the oil pressure against the momentary cylinder pressure transmitted to the hydraulic chamber, for a short interval at a predetermined angular crankshaft position, using a timing device located at the crankshaft end of a piston rod. The timing device consists of a set of small valves operated by inertial forces; with respect to the oil flow, these valves are arranged in series and on different timing given by their angular orientation, so as to open the oil passage during their opening overlap once per cycle.
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