| 摘要 |
PROBLEM TO BE SOLVED: To supply steady negative pressure to an air pressure type booster by using an ejector, in a negative pressure supplying device for an engine equipped with a supercharger. SOLUTION: A throttle valve 4, an intercooler 5, a turbo charger 6, and an air filter 7 are disposed in an intake pipe 3 of an engine main body 2. A first ejector 11 actuated by differential pressure between an upstream side and a downstream side of the throttle valve 4, and a second ejector 12 actuated by differential pressure between an upstream side and a downstream side of the turbo charger 6 are provided. Suction ports 11a, 12c of these ejectors 11, 12 are connected to a negative pressure chamber of the air pressure type booster 16 through check valves 14, 15. At the time of low speed operation of the engine, the vacuum degree of the negative pressure of the first ejector 11 is high, and at the time of high speed and high intensity operation, the vacuum degree of the negative pressure of the second ejector 12 is high. The check valves 14, 15 select the negative pressure having higher vacuum degree, thereby stably supplying negative pressure of high vacuum degree to the air pressure type booster regardless of an operating state. COPYRIGHT: (C)2003,JPO
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