Patent ID: 8714119

Claim:
An internal combustion engine system comprising: a compression chamber in which air is compressed; a combustion chamber for combusting air delivered from a reservoir or from said compression chamber with a fuel to create a motive fluid; an expansion chamber, separate from said combustion chamber, in which the motive fluid expands as a result of combustion; and at least one dual-chamber cylinder comprising: a substantially closed cylinder head; a substantially closed cylinder base; and a double-sided piston head disposed for reciprocating motion through a piston displacement within said dual-chamber cylinder, said double-sided piston head dividing said dual-chamber cylinder into said expansion chamber and said compression chamber; wherein said expansion chamber comprises an expander variable space between said reciprocating piston head and the closed cylinder head of said cylinder, and said compression chamber comprises a compressor variable space between said reciprocating piston head and said closed cylinder base, and whereby said cylinder integrates therein expansion and compression functions wherein only expansion or exhaust of motive fluid occurs in said expander variable space, and only intake or compression of air occurs in said compressor variable space.