| 摘要 |
A method of operating a free piston engine (10, 90, 100) of the present invention provides a piston (14) including a piston head (32) reciprocally disposed within a combustion cylinder (28), a plunger head (46) reciprocally disposed within a hydraulic cylinder (20), and a plunger rod (34) interconnecting the piston head (22) with the plunger head (46). The plunger head (46) and the hydraulic cylinder (20) define a variable volume pressure chamber on a side of the plunger head (46) generally opposite the plunger rod (34). A supply of hydraulic fluid is pulsed from a high pressure hydraulic accumulator (H) into the pressure chamber (50) during a beginning portion of a compression stroke to cause the piston head (32) to move toward a top dead center position. The high pressure hydraulic accumulator (H) is then decoupled from the pressure chamber (50). A low pressure hydraulic accumulator is coupled with the pressure chamber (50) during a remaining portion of the compression stroke, thereby allowing a relatively lower pressure hydraulic fluid to flow into the hydraulic cylinder (20) as the piston head (32) moves toward the top dead center position.
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