| 摘要 |
An internal combustion engine comprises an engine head having at least one cylinder and a crank shaft. Each cylinder holds a piston for driving the crank shaft. At least one intake and one exhaust valve assembly is positioned adjacent each cylinder. Each intake and each exhaust valve assembly includes a valve with an opened position and a closed position. The valve opens a cylinder port in the opened position and seals the cylinder port in the closed position. A valve controller applies hydraulic signals to each valve assembly which actuate each valve between the opened and closed positions as a function of the piston position.
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