| 摘要 |
An exhaust gas turbine type supercharger in which a casing of a turbine is divided into two chambers along a flow direction of the exhaust gas to form an open scroll and a closed scroll. The open scroll feeds the turbine with the exhaust gas over a full operational range of the engine. The closed scroll is opened to increase a flow rate of the exhaust gas to the turbine when the supercharged pressure is high as in a high load/high speed operation of the engine. A port is formed through a partitioning wall between the open scroll and a downstream exhaust gas passage of the turbine and an opening/closing valve is interposed thereat to thereby bypass the exhaust gas to a downstream portion of the turbine with the port being opened, when the supercharged pressure becomes high.
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