| 摘要 |
A method of operating a free piston internal combustion engine (10) includes the steps of: providing a housing (12) with a combustion cylinder (18) and a second cylinder (20), the combustion cylinder (18) having a bore with an inside diameter; providing a piston including a piston head (32) reciprocally disposed within the combustion cylinder (18), a second head (46) reciprocally disposed within the second cylinder (20), and a plunger rod (34) interconnecting the piston head (32) with the second head (46); and moving the piston (14) between a top dead center position and a bottom dead center position during a return stroke, the return stroke having a stroke length between the top dead center position and the bottom dead center position, the moving step being carried out with a bore/stroke ratio represented by a quotient of the inside diameter divided by the stroke length which is between 1.2 and 1.5. An air scavenging port (24) is in fluid communication with the bore during between 50 and 70 percent of a cycle time period.
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