Free piston internal combustion engine
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United States of America Patent
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-
Jan 9, 2001
Grant Date -
N/A
app pub date -
Jul 6, 1998
filing date -
Jul 1, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A free piston internal combustion engine having improved valve timing. A pair of oppositely disposed combustion chamber passageways extending between the combustion chamber and the earth's atmosphere, each have a combustion chamber valve for controlling the passage of gas through the passageways. The combustion chamber valves are essentially simultaneously opened and closed to permit independent variation and control of the compression ratio, expansion ratio, and stroke of the engine. When the valves are opened, the combustion chamber is purged or supercharged with combustion supporting air, and closed to initiate compression. Variable control of the piston positions at which the valves are opened and closed permits the engine to operate at a high efficiency over a broad range of power output loading conditions.
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