| 摘要 |
PURPOSE:To maintain the stable engine revolution state in idling by cutting-off a supercharger from the engine load by a clutch mechanism in the state where supercharge pressure is unnecessary. CONSTITUTION:A supercharge passage 15 is installed in parallel to a suction passage 1. The load and the revolution speed are detected by a throttle sensor SS and an engine revolution speed sensor ES, and the designated value of the opening degree of a supercharge pressure control valve 20 is obtained in a supercharge-pressure control circuit. The actual opening degree of a supercharge pressure control valve 20 is obtained by a supercharge pressure control valve opening-degree sensor VS. A control valve CV adjusts the actual opening degree to the designated value of the opening degree of the supercharge pressure control valve. A supercharger 10 is cut off from the engine load by tunning-OFF a clutch mechanism CL in the region where the supercharge pressure is min. and the supply of the supercharge pressure into the engine is unnecessary.
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