| 摘要 |
PURPOSE:To improve the durability of a secondary turbo supercharger by actuating the secondary turbo supercharger when non-connected condition of an engine and driving system is detected even in a low flow range of intake air. CONSTITUTION:At least, there are, respectively, provided parallelly a blower 111 of a primary turbo supercharger 104 which is actuated in a low flow range of intake air and a turbine 105, and a blower 113 of a secondary turbo supercharger 106 which is actuated in a high flow range and a turbine 107, in branch passages 110, 112 and exhaust passages 102, 103. When it is detected that an engine 101 is in neutral condition, the secondary turbo supercharger 106 is actuated even in a low flow range of intake air. Consequently, the secondary turbo supercharger 106 is supercharged, since preliminary rotation is controlled even in operation condition to be subjected to preliminary rotation and air is flown to the blower 113, so that it is possible to prevent continuous supercharging of air rised in temperature and also to prevent deterioration in durability caused by rise in temperature. |
