| 摘要 |
<p>A cycle changeable engine includes first intake valves (1) for a four-cycle operation which are disposed in intake ports (11) formed in a cylinder head (3), exhaust valves (2) disposed in exhaust ports (22), second intake valves (5) for a two-cycle operation, disposed in intake ports (9) formed at the lower part of a cylinder (6), and an electromagnetic valve driving device (10) for opening and closing each of the valves by electromagnetic force. The engine includes also a controller (15) which actuates either the first or second intake valves for opening and closing with the others being kept closed in response to a detection signal from detection means for detecting the number of revolutions or load of the engine, and changes the operational condition of the engine to the two-cycle or four-cycle operation. In this manner the engine is operated in the two-cycle operation at a low speed revolution of the engine to improve an output torque and is operated in the four-cycle operation at a high speed revolution of the engine to reduce fuel consumption, to improve mean effective pressure and volume efficiency and to reduce noise.</p> |
