| 摘要 |
PURPOSE:To increase an output as for what is equipped with two high pressure stage exhaust turbosuperchargers and one low pressure stage exhaust turbosupercharger, by arranging so as to make exhaust gas which has been cleaned up via a catalyst or the like concentrate on one high pressure stage super charger at the time of low speed low load operation. CONSTITUTION:At a diesel engine 10 provided with two high pressure stage exhaust turbosuperchargers 16a, 16b and one low pressure stage exhaust turbosupercharger 20, a piping 24 connecting an exhaust manifold 14a with the turbine 18a of a high pressure stage exhaust turbosupercharger 16a is valve-equipped with a 3 way valve 26, an after-burner device 28 and a catalyst 30. A bypass piping 32 is divergently connected at the 3 way valve 26 so as to bypass the catalyst 30. Also, a 3 way valve 36 is interveniently equipped at a piping 34 which connects an exhaust manifold 14b with the turbine 18a, and a connecting piping 38 between the piping 24 and the piping 34 is divergently connected at the 3 way valve 36. And respective valves 26, 36 are controlled so as to make exhaust gas concentrate on the turbine 18a of the super charger 16a at the operation time when the quantity of exhaust gas is small. |
