| 摘要 |
An engine has an auxiliary cylinder 2 and a valve body 6 slidable in this cylinder. The valve body 6 has a gas space 7 formed in it. The engine further has an actuator for shifting the valve body 6 to switch the communication between the main combustion chamber and the gas space 7 and the isolation of the chamber and cavity from each other. The slidable valve may function as a compression ratio changer, which switches the communication and the isolation according to the load on the piston. In this case, the engine has a third compression ring 18. The slidable valve may also function as a suction or exhaust valve, which switches the communication between the combustion chamber and auxiliary passage and the isolation of the chamber and passage from each other during the suction or exhaust strokes. This improves the suction or exhaust efficiency of the engine.
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