| 摘要 |
PURPOSE:To save the fuel cost by a method wherein a supercharger is driven when the operation of an engine is in its low and medium speed rotation zones and a passage bypassing the supercharge is closed so that the operation of the supercharger is limited accurately to the low and medium speed rotation zones of the engine. CONSTITUTION:A supercharger 14 is provided in an air intake passage 13 between an air cleaner 10 and a carburettor 11 and the driving shaft 19 of the supercharger 14 is removably connected to a pulley 17 rotated by the output shaft 15 of the engine through an electromagnetic clutch 18. Further, a bypass air intake passage 22 bypassing the supercharger 14 is provided in the air intake passage 13 and a constantly opened control valve 21 is interposed in the air intake passage 22. The electromagnetic clutch 18 and the control valve 21 are controlled by a control circuit 30. In other words, when the engine r.p.m. detected from the output of an engine r.p.m. sensor 31 is in the low or medium speed rotation zone of the engine, the electromagnetic clutch 18 is held in its connected condition and the control valve 21 is closed to thereby increase the supercharging pressure of the supercharger. |
