Patent ID: 8516814

Claim:
An exhaust gas purifying apparatus for a turbocharged internal combustion engine, comprising: a turbocharger which includes, in an exhaust passage, a turbine which is driven by exhaust energy of the internal combustion engine; an upstream side catalyst which is disposed in the exhaust passage and purifies exhaust gas; a downstream side catalyst which is disposed in the exhaust passage at a downstream side of the upstream side catalyst and purifies the exhaust gas; a first exhaust bypass passage branching off from the exhaust passage at an upstream portion of the turbine while merging again with the exhaust passage at a portion between the turbine and the upstream side catalyst, the first exhaust bypass passage bypassing the turbine; a second exhaust bypass passage branching off from the exhaust passage at an upstream portion of the turbine while merging again with the exhaust passage at a portion between the upstream side catalyst and the downstream side catalyst; a first waste gate valve which plays a role in opening and closing the first exhaust bypass passage; and a second waste gate valve which plays a role in opening and closing the second exhaust bypass passage, wherein in a state in which a pressure of exhaust gas at an upstream side of the turbine is increasing, the second waste gate valve is set or controlled so as to open at a boost pressure of the internal combustion engine or at a pressure at the exhaust passage that is lower than a boost pressure of the internal combustion engine or than a pressure at the exhaust passage at each of which the first waste gate valve opens.