A power inverter for driving an electric machine is configured to apply a voltage to the electric machine based on a high-frequency injection current. Three phase currents are measured and input into a current controller. A voltage command output from the current controller is monitored using a discrete Fourier transform to determine a positive and negative sequence voltage of the voltage command. The sequence voltages are compared to expected positive and negative sequence voltages. A loss of connection diagnostic is output if a magnitude of the difference between the expected and actual sequence voltages is greater than a predetermined threshold.
High frequency injection-based high voltage interlock
2019-08-20
Patent
Electronic Resource
English
IPC: | B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / H02P CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS , Steuern oder Regeln von elektrischen Motoren, elektrischen Generatoren, dynamoelektrischen Umformern |
High-frequency signal injection based high voltage interlock
European Patent Office | 2015
|