| 摘要 |
PURPOSE:To save the fuel cost by a method wherein when the engine r.p.m. is below a predetermined value and the vehicle speed is above a predetermined value, a supercharger is driven and a passage by-passing the supercharger 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 interposed 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 which is rotated by the output shaft 15 of the engine through an electromagnetic clutch 18. Further, the air intake passage 22 by-passing 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 by a tachometer 32 is below a predetermined value and the vehicle speed is above a predetermined value, 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. |
