Abstract: An exhaust gas turbocharger consists of an exhaust gas turbine and a compressor mounted on a common shaft which can be driven by an electric motor controlled via a controller. The controller, which is designed as a computer, receives as control data the control input supplied to the controller of the internal combustion engine as the set value and actual performance values. The controller computes and supplies, from the received control data and from stored values, control signals by which, in the motor-operating mode of the electric motor, the internal combustion engine accelerates as quickly as possible at combustion air ratios optimal for low-smoke combustion and by which, in the generator-operating mode of the electric motor, a maximum of excess exhaust gas energy can be fed to an electric accumulator network as electrical energy via a static converter.

Abstract: The twin exhaust-gas-powered turbines (9, 10) driving intake air compressors (1, 2) for an internal-combustion engine are connected together and mounted on central support brackets (47, 48) by a common turbine discharge housing (20) that deflects the discharge of each turbine separately towards an outlet funnel (24) with the help of a guiding structure that contains a median wall (33). Diffuser horns (31, 32) and hollow central plugs provide, in a short axial distance, for establishing a static pressure for causing the gas to flow with uniform pressure distribution out through the discharge funnel (24). The latter portion of the outflow path is enlarged by side pieces (26, 27) fitting over holes in the central piece (20) of the discharge casing through which the diffuser horns (31, 32) protrude with ample spacing from other components.

Abstract: The rear radially extending component of a radial flow turbine or compressor rotor is centered on a cylindrical surface spaced from the common shaft, on which the rotor is wedged by a tapered sleeve, by an extension of one component fitting into a recess in the other, but this cylindrical surface is not required to transfer any torque, because that is transferred from the forwardly extending component to the radially extending component by ridges of one fitting into radial grooves of the other near the base of the vanes. Greater thermal expansion of the radially extending component is accommodated by the claw ridge slipping radially in its groove.