Method for operating an electric traction drive system comprising a battery direct inverter and associated control apparatus

摘要

The disclosure relates to a method for operating an electric traction drive system, which comprises an electric motor and a battery with a plurality of battery strings having battery modules. Each battery module is configured to be connected selectively with respect to output terminals of a respective battery string with positive polarization or negative polarization or to be bridged in the respective battery string, such that each battery string is configured to produce an adjustable output voltage. The battery modules are each monitored for proper functioning. When a technical fault in at least one battery module is detected, the at least one battery module is bridged and the traction drive system is transferred to a transition state in which the electric motor continues to be supplied and actuated by the connected battery modules in the battery module string such that a presently generated torque is maintained unchanged.

主权项

1. A method for operating an electric traction drive system, including an electric motor and a battery, the battery including a plurality of battery strings, each battery string of the plurality of battery strings including output terminals and a plurality of battery modules, the method comprising:
producing an adjustable output voltage with each battery string of the plurality of battery strings by selectively connecting battery modules of the plurality of battery modules with positive polarization or negative polarization with respect to the output terminals of a respective battery string, or bridging battery modules of the plurality of battery modules in the respective battery string; monitoring each battery module of the plurality of battery modules for proper functioning during operation of the electric traction drive system; bridging a detected battery module of the plurality of battery modules in response to detecting a technical fault of the detected battery module; and transferring the electric traction drive system to a transition state in response to detecting the technical fault of the detected battery module, wherein in the transition state the electric motor continues to be supplied with power and is actuated by remaining connected battery modules of the plurality of battery modules such that a torque produced during the transition state remains unchanged.