Abstract
A fundamental test apparatus of the hydraulic free piston internal combustion engine, whose pistons stop after every gas cycle, is constructed and tested. To eliminate the vibration of the system, an opposed-piston construction is used in this experiment. Other features of the test apparatus are fuel injection, compression ignition, uniflow scavenging, two-stroke cycle and single cylinder. For intermittent operation, a high-performance pilot-operated hydraulic check valve is necessary, and a newly designed and constructed valve is used in this test. The synchronization of the opposed pistons is achieved by positioning both pistons at mirror positions before the start of the gas cycle; no mechanical cynchronization system is employed. The test apparatus performs satisfactorily, and intermittent operation, stopping after every gas cycle, is realized.
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