EXHAUST-GAS TURBOCHARGER AND MOTOR VEHICLE

Abstract

An exhaust-gas turbocharger for a motor vehicle includes a compressor, a first and a second axial turbine, an electrical generator and an electric motor. The axial turbines are configured to drive the generator. The generator is configured to provide a feed to the electric motor. The electric motor is configured to drive the compressor.

Claims

1. An exhaust-gas turbocharger comprising a compressor, a first and a second axial turbine, an electrical generator and an electric motor, wherein the axial turbines are each configured to drive the generator, wherein the generator is configured to provide a feed to the electric motor, and, wherein the electric motor is configured to drive the compressor.

2. The exhaust-gas turbocharger as claimed in claim 1, wherein the first axial turbine and the second axial turbine have a common output shaft, and the generator is arranged on the common output shaft.

3. The exhaust-gas turbocharger as claimed in claim 2, wherein the generator is arranged between the first axial turbine and the second axial turbine.

4. The exhaust-gas turbocharger as claimed in claim 3, wherein the axial turbines each comprise a turbine housing and a turbine wheel mounted rotatably within the turbine housing, and the axial turbines are configured such that the turbine wheels are impinged on by flow in opposite directions along the common output shaft.

5. The exhaust-gas turbocharger as claimed in claim 4, wherein the axial turbines further comprise a common outlet, and the common outlet is fluidically connected to an exhaust-gas catalytic converter.

6. A motor vehicle comprising the exhaust-gas turbocharger and the exhaust-gas catalytic converter as claimed in claim 5, and wherein the common outlet is fluidically connected to the exhaust-gas catalytic converter.

7. The motor vehicle as claimed in claim 6, wherein the motor vehicle further comprises a charge-air cooler, and wherein the compressor is fluidically connected to the charge-air cooler.

Description

BRIEF DESCRIPTION OF THE DRAWING FIGURES

[0016] Exemplary embodiments of the invention are illustrated in the drawings and are described in more detail below.

[0017] FIG. 1 shows a radial turbine.

[0018] FIG. 2 shows a mixed-flow turbine.

[0019] FIG. 3 shows an axial turbine.

[0020] FIG. 4 shows a biturbo-type turbocharger arrangement.

[0021] FIG. 5 shows a conventional turbocharger arrangement.

[0022] FIG. 6 shows a first embodiment of the invention.

[0023] FIG. 7 shows a second embodiment of the invention.

[0024] FIG. 8 shows a detail of the second embodiment.

DETAILED DESCRIPTION OF THE INVENTION

[0025] As per FIG. 6, the exhaust-gas turbine (15) and the compressor (14) are not connected by means of a common shaft, but are connected in each case to an electric machine (17, 18).

[0026] FIG. 7 illustrates an engine concept with six cylinders distributed across two cylinder banks. The illustrated arrangement provides that a compressor (14) is driven by an electric motor (18) and provides the charge pressure required for the internal combustion engine.

[0027] On the exhaust-gas side, provision is made for two axial turbines (19) and one generator (17) to be arranged on a common shaft, wherein the generator (17) is arranged between the axial turbines (19). This arrangement will be described below on the basis of FIG. 8.

[0028] As can be seen from the figure, the axial turbines (19) are, by contrast to the conventional situation, impinged on by flow from the outside, such that an optimum impingement of flow on the blades (12) is possible, and no diversion is necessary. Each bank of the engine thus flows through one axial turbine (19).

[0029] At the turbine outlet, the two exhaust-gas flows are merged and can be conducted onward to a common exhaust-gas catalytic converter (13).

[0030] It is self-evident that the arrangement described above on the basis of axial turbines (19) may, with suitable adaptations, be implemented with two radial or other exhaust-gas turbines (15) without departing from the scope of the invention.