| 摘要 |
PURPOSE:To prevent a negative pressure from being exerted on the compressor part of a supercharger with a low volume under a stop of operation, providing a check valve in a suction bypass passage, bypassing the outlet and the inlet of the supercharger with a low volume. CONSTITUTION:During low load operation of an engine, with a bypass valve 6 fully opened, a turbine 7a of a supercharger 7 with a high volume is driven through driving of a turbine 3a of a supercharger 3 with a low volume by means of a whole amount of exhaust gas. Air, pressurized by compressors 7b and 3b, is fed to the combustion chamber of an internal combustion engine 1. In a middle load range, with the bypass valve properly opened, exhaust gas is simultaneously fed to the turbines 3a and 7a. In a high load range, with the bypass valve 6 fully opened, exhaust gas bypassing the turbine 3a is increased to bring the supercharger 3 into a stop. Intake air is all fed to the internal combustion engine 1 through a reed valve 14 and a suction passage 16 by means of a suction bypass passage 13. |
