| 摘要 |
PURPOSE:To prevent the counterflow of the pressurized intake securely in a sequential turbo by providing an intake cut valve for opening/closing an intake passage in which a blower of a supercharger to be operated in the high flow quantity side is provided, and controlling that valve to be forcedly closed in the low flow quantity area. CONSTITUTION:A primary turbo supercharger 104 to be operated in the low flow quantity side of the intake air quantity and a secondary turbo supercharger 106 to be operated in the high flow quantity side are provided in parallel with intake passages 110, 112 and exhaust passages 102, 103. An exhaust cut valve 123 is provided in the exhaust passage 103 in which a secondary side turbine 107 is located, while an intake cut valve 132 is provided in the downstream side of a secondary blower 113 of the intake passage 112 in which the secondary side blower 113 is located. This intake cut valve 132 is opened/closed by a diaphragm type actuator 133, and the actuator 133 controls the intake cut valve 132 with a three-way valve 138 to be opened in the predetermined area and closed in the low flow quantity area. |
