| 摘要 |
PURPOSE:To enable to smoothly shift from a non-supercharging area to a super charging area so as to improve supercharge responsiveness by arranging the constitution in such a way that the lower the revolution number of an engine is, the more quickened the bypass valve starting time to close in. CONSTITUTION:A bypass valve 34 is fully opened in non-supercharging area and load control is executed by adjusting a throttle valve 26. And the throttle valve 26 is fully opened in supercharging area and the load control is executed by adjusting the bypass valve 24. When shifting from this non-supercharging area to the supercharging area, the opening degree of the bypass valve 34 is so set as to be throttled in advance while being made to correspond to the opening degree of an accelerator required for supercharge which varies with revolution numbers N at low revolution of an engine. When the opening degree of the accelerator is opened until it becomes an atmospheric pressure, because the bypass valve 34 is close, immediately after that a supercharger 26 operates and the shifting between two areas is executed smoothly.
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