| 摘要 |
PURPOSE:To enable improvement of supercharge efficiency in a wide operation region and improvement of response in a low load range, by a method wherein a supercharger with a low capacity is disposed on the upper stream side, and two supercharges having different capacities are interconnected in series. CONSTITUTION:During low load running of an engine, with a bypass valve 6 fully opened, a whole amount of exhaust gas incomes to a turbine 7a of a supercharger 7 with a high capacity through a turbine 3a of a supercharger 3 with a low capacity. Intake air, passing an air cleaner 11 and a compressor 3b, is further pressurized by a compressor 7b and is fed to the combustion chamber of an internal combustion engine 1. In a middle load range, with the bypass valve 6 properly opened, the two turbines 3a and 7a are driven. In a high load range, with the bypass valve 6 fully opened, the supercharger 3 is brought into a stop. A whole amount of intake air incomes through a reed valve 14 by means of a bypass passage 13, and is supercharged by the supercharger 7. |
