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In a variable exhaust gas turbocharger for an internal combustion engine including an exhaust gas turbocharger to which exhaust gas is supplied from the engine to provide a torque for driving the turbocharger, an additional device is provided which includes an electrical or mechanical drive for supp

In a variable exhaust gas turbocharger for an internal combustion engine including an exhaust gas turbocharger to which exhaust gas is supplied from the engine to provide a torque for driving the turbocharger, an additional device is provided which includes an electrical or mechanical drive for supplying an additional torque to the exhaust gas turbocharger in order to maintain the exhaust gas turbocharger at a certain speed at which it is capable of generating a desired inlet air pressure for the charge air supplied to the internal combustion engine.

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1. A variable exhaust gas turbocharger (1) for an internal combustion engine (10), comprising an exhaust gas turbine (2) including a housing having a turbine inlet flow passage (2.3) with a variable flow cross-section, a turbine wheel (2.2), a charge air compressor (3) with a charge air compressor w

1. A variable exhaust gas turbocharger (1) for an internal combustion engine (10), comprising an exhaust gas turbine (2) including a housing having a turbine inlet flow passage (2.3) with a variable flow cross-section, a turbine wheel (2.2), a charge air compressor (3) with a charge air compressor wheel (3.1) disposed in said housing, a shaft (1.2) rotatably supported in said housing and carrying both said turbine wheel (2.2) and said compressor wheel (3.1), means for conducting exhaust gas from said combustion engine (10) to said turbine wheel (22) for driving the turbine wheel (2.2) with a first torque, an additional device (6) disposed in communication with said exhaust gas turbocharger (1) for supplying a second torque to said exhaust gas turbocharger, said additional device (6) being a compressor with a charge air inlet (3.6) and a charge air outlet (3.3) in communication with the compressor inlet of the exhaust gas turbocharger for supplying a second torque to the compressor wheel (3.1) and the turbocharger shaft, said charge air outlet of said additional compressor (6.2) including a main flow duct branching into two separate ducts, one being connected to an additional axial inlet duct (3.4) of the charge air compressor (3) and the other extending to a radial inlet duct (3.3a) of said compressor, said additional device (6) being driven by one of a mechanical drive and an electric motor.2. A variable exhaust gas turbocharger according to claim 1, wherein the additional compressor (6.2) is connected to the inlet of the charge air compressor (3) of the turbocharger.3. A variable exhaust gas turbocharger according to claim 1, wherein the inlet (3.3a) of the charge air compressor (3) of the turbocharger includes a throttling device (3.5) for changing the flow cross-section of the inlet (3.3a).4. A variable exhaust gas turbocharger according to claim 1, wherein the charge air compressor wheel (3.1) has an axial inlet area and a radial outlet area.5. A variable exhaust gas turbocharger according to claim 1, wherein the additional axial inlet duct (3.4) is connected upstream of the charge air compressor wheel (3.1) to an additional radial inlet flow passage (3.4a) and an adjustable guide vane structure is disposed in the additional radial inlet flow passage (3.4a).6. A variable exhaust gas turbocharger according to claim 1, wherein downstream of the charge air compressor wheel (3.1) an adjustable diffuser guide vane structure is arranged in the housing (1.1) and the compressor wheel (3.1) is a radial compressor wheel.7. A variable exhaust gas turbocharger according to claim 1, wherein the exhaust gas turbocharger (1) is connected to a control system (20) of the internal combustion engine (10), the control system (20) includes a control unit (30) which receives actual values (35) of the internal combustion engine and several pressure sensors included in the control system, and the control system (30) supplies control signals (31, 32, 33, 34) to control devices controlling the operation of the exhaust gas turbocharger.8. A variable exhaust gas turbocharger according to claim 1, wherein the exhaust gas turbine (2) includes a, with respect to the axis of rotation of (1.2a) of the turbine wheel (2.2), radial inlet passage (2.3) including a radial guide vane structure (2.3a) and an axial inlet flow passage (2.4) with an axial exhaust gas guide vane structure (2.4a) and at least one of the guide vane structures (2.3a, 2.4a) is adjustable.9. A variable exhaust gas turbocharger according to claim 7, wherein the radial inlet passage (2.3) of the turbine (2) has a variable flow cross-section (2.1).10. A variable exhaust gas turbocharger according to claim 1, wherein means are provided for providing to the exhaust gas turbocharger a second torque?in addition to the torque supplied by the engine exhaust gas so that the turbocharger is maintained at a high speed and the speed of the turbocharger (1) is maintained within a 20% range of a desired speed.11. A variable exhaust gas turbocharger according to claim 10, wherein maximally 10% of the nominal compressor power input is supplied to the exhaust gas turbocharger (1) by the additional unit (6).