System using supplemental compressor for egr

A turbocharger system for an engine, the engine having an intake air manifold, an exhaust manifold, the exhaust gas manifold directing exhaust gas into the turbocharger and the turbocharger directing compressed air into the intake air manifold, comprising:

• an exhaust gas turbine having a turbine housing and a turbine wheel within the turbine housing fixedly mounted on a shaft, the turbine housing having an inlet in fluid communication with the exhaust gas manifold and an outlet in fluid communication with an exhaust gas discharge conduit;
• a main intake air compressor having a main compressor housing and a main compressor wheel within the main compressor housing fixedly mounted on the shaft, the main compressor housing having an inlet in fluid communication with intake air and an outlet in fluid communication with the intake air manifold;
• and
• a supplemental compressor having a supplemental compressor housing and a supplemental compressor wheel within the supplemental compressor housing fixedly mounted on the shaft, the supplemental compressor housing having an inlet in fluid communication with the exhaust gas manifold and an outlet in fluid communication with the intake air manifold;
• the turbine wheel configured to be rotated by exhaust gas flow through the turbine housing, rotation of the turbine wheel rotates the shaft and thereby rotates the main compressor wheel and the supplemental compressor wheel, rotation of the main compressor wheel compresses intake air and delivers compressed intake air to the intake air manifold, rotation of the supplemental compressor wheel compresses exhaust gas and delivers compressed exhaust gas to the intake air manifold.