Abstract: the present disclosure is related to an engine with entry ignition, comprising a compressor coupled to a pressure reservoir, wherein the pressure reservoir comprises a conduit connected to a mixing chamber wherein the mixing chamber comprises a fuel injector, and wherein the mixing chamber is coupled to a combustion chamber, a valve at the opening of the combustion chamber, wherein the valve is configured to open and close one or more channels between the mixing chamber and the combustion chamber, an exhaust valve at the opening of the combustion chamber. and a valve actuator connected to the exhaust valve.

Abstract: An engine with mesh anchored combustion with a pressure regulating auxiliary chamber for providing controlled internal combustion at essentially a constant pressure. The engine comprises a main cylinder and piston with an auxiliary chamber and piston integral therewith. The auxiliary chamber is adjacent to the main cylinder head, connected thereto through a relatively narrow throat. A mesh is positioned in the throat at the boundary of the main cylinder and the auxiliary chamber. Accordingly, when the main piston compresses a charge in the main cylinder during its compression stroke, the charge is pushed through the mesh into the auxiliary chamber. The auxiliary chamber piston pushes the charge in the reverse direction back through the mesh into the main cylinder. As the charge passes through the mesh back into the main chamber, its combustion forces the main piston back down toward bottom dead center.

Abstract: An engine with mesh anchored combustion with a pressure regulating auxiliary chamber for providing controlled internal combustion at essentially a constant pressure. The engine comprises a main cylinder and piston with an auxiliary chamber and piston integral therewith. The auxiliary chamber is adjacent to the main cylinder head, connected thereto through a relatively narrow throat. A mesh is positioned in the throat at the boundary of the main cylinder and the auxiliary chamber. Accordingly, when the main piston compresses a charge in the main cylinder during its compression stroke, the charge is pushed through the mesh into the auxiliary chamber. The auxiliary chamber piston pushes the charge in the reverse direction back through the mesh into the main cylinder. As the charge passes through the mesh back into the main chamber, its combustion forces the main piston back down toward bottom dead center.

Abstract: A free piston engine utilizes a shuttle frame external to combustion chambers to rigidly link shuttle parts reciprocating along a centerline. If the shuttle parts are spaced apart along the centerline, the shuttle frame may be struts extending from the shuttle parts and linked by rods. Alternatively the shuttle parts are within a tubular shuttle frame that forms part of the combustion chamber boundary. If one shuttle part is arranged around the other with both centered about the centerline, the shuttle frame may include an annular plate between a cylindrical inner shuttle part and an annular outer shuttle part. Alternatively the shuttle frame may include an inner tube with a cylindrical inner shuttle part within the inner tube, and an outer tube with an annular outer shuttle part arranged between the inner and the outer tubes so that the shuttle frame forms part of the combustion chamber boundary.