Two-stage turbo-charger engine system

[0023] figure 1 The structure of an embodiment of the turbocharged engine system according to the invention is shown.

[0024] The turbocharged engine system has an engine E with 4 cylinders Z, a high-pressure turbocharger 1 , a low-pressure turbocharger 9 and a diesel particulate filter DPF. For clarity, other components of engine E are in figure 1 not drawn in.

[0025] The high-pressure turbocharger 1 comprises a high-pressure turbine 2 and a high-pressure compressor 4 driven by the high-pressure turbine 2 via a shaft 3 . The high-pressure turbine inlet 1 a is communicatively connected to an exhaust manifold 6 of the engine E through a high-pressure exhaust pipe 5 . The high-pressure exhaust pipe 5 is also called a high-pressure turbine connection pipe. The high-pressure compressor outlet 4a is communicatively connected to the intake manifold 8 of the engine E through the high-pressure intake pipe 7 . An intercooler 7 a is provided in the high-pressure intake pipe 7 .