| 摘要 |
An objective of the present invention is to provide a two-stage turbocharger apparatus which applies a plurality of flow passages to a high pressure and a low pressure turbine entrance end of a serial two-stage turbocharger apparatus to improve performance. According to the present invention, the two-stage turbocharger apparatus comprises: a first flow passage and a second flow passage connected in series to supply exhaust gas emitted from an exhaust manifold of an engine to an entrance end of a high pressure turbine, wherein cross sectional areas thereof are different from each other; a third flow passage and a fourth flow passage connected in series between an exit end of the high pressure turbine and an entrance end of a lower pressure turbine, wherein cross sectional areas thereof are different from each other; an exhaust gas recirculation valve whose one end is connected to the first flow passage; and a bypass line wherein one end thereof is connected to the second flow passage, and an other end thereof is connected to the third flow passage. The cross sectional area of the first flow passage is narrower than the cross sectional area of the second flow passage. The cross sectional area of the third flow passage is narrower than the cross sectional areas of the second flow passage and the fourth flow passage. |
