Method for testing switch signals of an inverter of an electric machine controlled via a pulse-width modulation
AssigneeSchaeffler Technologies AG & Co. KG
InventorsHuan Fu, Vincent Leonhardt, Eduard Enderle
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Abstract
A method is provided for testing switch signals of an inverter of an electric machine of a drive system of a motor vehicle. The electric machine is controlled via a pulse-width modulation generated by a control unit using a target duty cycle and a triangular-waveform voltage sequence. An actual duty cycle of a current pulse-width modulation is continuously ascertained from the switch signals and compared with the target duty cycle of the control unit.
Claims20
A method for testing switch signals of an inverter of an electric machine of a drive system of a motor vehicle, the method comprising:
- controlling the electric machine via a pulse-width modulation generated by a control unit using a target duty cycle and a triangular-waveform voltage sequence;
- continuously determining an actual duty cycle of the pulse-width modulation from the switch signals of the inverter of the electric machine;
- and
- comparing the actual duty cycle and the target duty cycle to determine one or more corrections to the target duty cycle.
A method for controlling an electric machine, comprising:
- generating a pulse-width modulation based on a target duty cycle and a triangular-waveform voltage sequence;
- determining, by a control unit, an actual pulse-width modulation output from switch signals of an inverter of the electric machine;
- determining, by the control unit, an actual duty cycle based on the actual pulse-width modulation;
- and
- then updating, by the control unit, the pulse-width modulation based on a comparison of the actual duty cycle and the target duty cycle.
Dependencies are inferred from the claim text.