| 摘要 |
PURPOSE: To suppress generation of knocking by providing a rotary valve on an intake passage of an engine, which valve can set a closing timing around a bottom dead center of an intake passage, setting the closing timing of an intake valve within a specified range, thereby providing pumpling loss which is substantially zero, and reducing compression temperature of an engine. CONSTITUTION: A rotary valve 4 is arranged on the way of an intake passage 3 of an engine 1. An opening/closing timing of the rotary valve 4 is adjusted by means of an adjusting piece mechanism 8 arranged on a rotary shaft 7. The adjusting piece mechanism 8 is controlled by a valve opening/closing timing adjusting device 11 composed of an actuator 9 and a controller 10. The closing timing is set near a bottom dead center in an intake process according to knocking in a high load time in an Otto cycle engine, and according to supercharge pressure in a diesel engine. The closing timing of an intake valve provided on a cylinder head is set between 60 and 110 degrees after the bottom dead center in the intake process.
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