| 摘要 |
PURPOSE:To prevent incomplete combustion, decrease compression ratio and enlarge the maximum output without varying structure member by communicating single auxiliary exhaust turbo supercharger whose volume is smaller than those of main exhaust turbo superchargers. CONSTITUTION:A gap between respective exhaust passages 5, 6 and respective main exhaust turbo superchargers 7, 8 and a gap between one exhaust passage 5 and the other exhaust passage 6 are opened/closed in response to engine speed. A single auxiliary exhaust turbo supercharger 29 whose volume is smaller than those of the main exhaust turbo superchargers 7, 8 is communicated with both exhaust passages 5, 6 and the gap between the auxiliary exhaust turbo supercharger 29 and both exhaust passages 5, 6 is opened/closed according to the engine speed. Therefore, when a load is small due to super-low speed rotation like the idling time turbine rotational speed of the auxiliary exhaust turbo supercharger 29 can be increased even if an exhaust gas quantity is small by compressing intake air by the auxiliary exhaust turbo supercharger 29, and the intake pressure can be remarkably increased. |
