Digital hydraulic opposed free piston engines and methods
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United States of America Patent
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Oct 11, 2016
Grant Date -
Jan 31, 2013
app pub date -
Jul 20, 2012
filing date -
Jul 29, 2011
priority date (Note) -
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Abstract
Digital hydraulic opposed free piston internal combustion engines having a pair of free pistons in a pair of cylinders defining a combustion chamber above each free piston. The pair of free pistons is arranged to move within the pair of cylinders with parallel axes of free piston motion, and preferably co-linear axes of free piston motion. At least one hydraulic plunger is under each free piston with each hydraulic plunger in a respective hydraulic cylinder. The hydraulic cylinders are coupled to electronically controlled hydraulic cylinder valving. A controller controls the electronically controlled hydraulic cylinder valving to control the pair of free pistons to have substantially equal and opposite motions.
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