Four-stroke relative motion cylinder with dedicated compression space

A mechanical engine cylinder system, comprising:

• a cylinder including an internal space, an occupying structure with a cavity, and a crankshaft piston;
• wherein the internal space of the cylinder is modified by the occupying structure, having a dedicated compression space and a dedicated combustion space;
• wherein the occupying structure provides a surface interface with the dedicated compression space, wherein the occupying structure completely contains within the cavity a primary combustion space utilized during an early stage of a power stroke;
• wherein the occupying structure has an edge that separates the primary combustion space from a secondary combustion space;
• wherein combustion pressure applied to the crankshaft piston during the power stroke is applied to a smaller surface area of the crankshaft piston during an early stage of the power stroke and to a larger surface area of the crankshaft piston during a later stage of the power stroke;
• wherein the combustion pressure applied to the occupying structure applies a net-force to the occupying structure in the direction of the crankshaft piston during the early stage of the power stroke, and in the opposite direction of the crankshaft piston during the later stage of the power stroke;
• wherein surfaces of the occupying structure and the crankshaft piston are sized such that a disengagement occurs during the power stroke between the occupying structure and crankshaft piston;
• wherein motion of the occupying structure during the early stage of the power stroke creates a suction force of compression fluid into the dedicated compression space;
• and
• wherein the occupying structure competes with combustion fluid displacement for volume, when filling the swept volume created by the motion of the crankshaft piston during an expansion stroke, such that the combustion fluid displacement volume is less than the addition of clearance and swept volumes within the internal space of the cylinder.