Two-stage turbocharger system

A two-stage turbocharger system for an internal combustion engine having an inlet manifold, an exhaust manifold and an exhaust system, the turbocharger system comprising:

• a low pressure compressor having an inlet and an outlet;
• a high pressure compressor having an inlet coupled to the low pressure compressor and an outlet configured to be coupled to the intake manifold;
• a high pressure turbine having an outlet configured to be coupled to the exhaust manifold, the high pressure turbine further including a high pressure by-pass line and a high pressure controlled by-pass valve;
• a low pressure turbine having an inlet coupled to the high pressure turbine and an outlet configured to be coupled to the exhaust system, the low pressure turbine further including a low pressure by-pass line and a low pressure controlled by-pass valve;
• and
• a controlled valve between the high pressure turbine and the low pressure turbine.

An internal combustion engine comprising:

• an inlet manifold;
• an exhaust manifold;
• an exhaust system;
• and
• a turbocharger system including:
• a low pressure compressor having an inlet and an outlet;
• a high pressure compressor having an inlet coupled to the low pressure compressor and an outlet coupled to the intake manifold;
• a high pressure turbine having an outlet coupled to the exhaust manifold, the high pressure turbine including a high pressure by-pass line and a high pressure controlled by-pass valve;
• a low pressure turbine having an inlet coupled to the high pressure turbine and an outlet coupled to the exhaust system, the low pressure turbine including a low pressure by-pass line and a low pressure controlled by-pass valve;
• and
• a controlled valve between the high pressure turbine and the low pressure turbine.