| 摘要 |
An internal combustion engine provides cooler working cycle and, selectively, mean effective cylinder pressure higher than conventional Otto and Miller cycle engine arrangements. According to one embodiment, during each cycle, intake valve is held closed during the initial portion of the intake stroke and then opened and closed. In another embodiment, during each cycle, intake valve opens twice, once opening and closing during the intake stroke and, then opening and closing again. In all embodiments, the last intake valve closing of the cycle is during the compression stroke at a point which captures a charge weight needed to power the engine and at such time that the effective compression ratio of the engine will be less than the expansion ratio. The combustion chambers, engine stroke and/or cylinder bore are selectively sized. An expansion valve is alternately provided to cool entry air, and may have a controllable, variable orifice.
|
