| 摘要 |
A turbocharged engine includes intake passage and an exhaust passage connected with the engine, a compressor rotor of a turbocharger inserted in the intake passage, a turbine rotor of the turbocharger inserted in the exhaust passage and connected with the compressor rotor, a bypass passage connecting an upstream side of the turbine rotor and a downstream side thereof in parallel with the exhaust passage, an opening formed between the exhaust passage and the bypass passage, a first port formed at a downstream side of the compressor rotor in the intake passage and supplying a first signal pressure, a second port formed at a scroll portion of the turbocharger in the compressor rotor side and supplying a second signal pressure, a waste gate valve opening or closing the opening according to the first or second signal pressure, and a 3-way valve connecting the signal pressure chamber to the first port or second port selectively. When a revolution number of the engine is low, the 3-way valve connects the signal pressure chamber the second port and when a revolution number of the engine is high, the 3-way valve connects the signal pressure chamber to the first port.
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