Patent ID: 8970144
Filing Date: 2015-03-03
Classification: B60L,H02J,H02P,Y02T

Abstract:
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.