Turbo compound transmission and a method for controlling a turbo compound transmission

摘要

A turbo compound transmission, such as in a heavy duty or medium duty diesel engine, includes a turbo compound turbine to be driven by exhaust gases from an internal combustion engine, and a coupling including a first rotor including a mechanical input drive adapted to be driven by the turbine, and a second rotor including a mechanical output drive. A brake is arranged to brake and limit the rotation of the turbine. The coupling is arranged to decouple when braking with the brake, subjecting the coupling to a torque above a predetermined torque limit. A method for controlling a turbo compound transmission is also disclosed.

主权项

1. A turbo compound transmission, comprising:
a turbo compound turbine to be driven by exhaust gases from an internal combustion engine; and a coupling comprising a first rotor comprising a mechanical input drive adapted to be driven by the turbine, a second rotor comprising a mechanical output drive, and a brake arranged to brake and limit the rotation of the turbine, the coupling being arranged to decouple when braking with the brake, and the coupling is arranged to decouple above a predetermined torque limit, wherein the coupling is a magnetic coupling, and wherein a maximum torque transmission capability of the magnetic coupling defines the predetermined torque limit, such that the magnetic coupling is arranged to be detached when braking with the brake results in a torque over the coupling above the maximum torque transmission capability, the magnetic coupling comprising the first rotor having the mechanical input drive driven by the turbine and a first quantity of permanent magnets wherein the first rotor is a high speed rotor, the second rotor being concentric with the first rotor, the second rotor comprising a second quantity of permanent magnets, and a third rotor, the third rotor being concentric with the first and second rotor and being arranged in between the first rotor and the second rotor, wherein one of the second and third rotors comprises the mechanical output drive, and the other of the second and third rotors is non-rotatably fixed to a housing and unconnected to a mechanical drive.