Brake assistance method and electric drive system with brake assist function

摘要

The invention relates to an electric drive system for an electrically operated vehicle, comprising a control system, an inverter, which has a plurality of semiconductor switches, and an electrical machine, which is coupled to the inverter, and which of the inverter with a single- or multi-phase supply current is fed. The control control is configured to receive a brake request signal for the vehicle, upon receiving the brake request signal, drive the plurality of semiconductor switches of the inverter to operate the electric machine in the generator mode, and to supply the phase current through the plurality of semiconductor switches for a predefined period in a phase current value range hold, in which the semiconductor switches are exposed to thermal damage.