System and method for controlling a multiphase electric motor while taking current oscillations into account
AssigneeRENAULT s.a.s.
InventorThanh Nguyen
Life of this patent
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Abstract
A system and method for controlling a multiphase electric motor fitted to a motor vehicle. The motor includes a rotor powered by a voltage chopper or a rotor with permanent magnets and a stator powered by a multiphase voltage inverter. The multiphase voltage inverter is powered via a high-voltage DC bus. The control system receives as an input a torque setpoint of an electric-vehicle computer. The system also includes a system for the dynamic control of the torque setpoint to determine a dynamic correction of torque ripple and a device for determining setpoints for powering the electric motor as a function of the torque setpoint and of the dynamic correction of torque ripple.
Claims12
A system for controlling a multiphase electric motor fitted to a motor vehicle, said motor including a rotor powered by a voltage chopper or a rotor with permanent magnets, and a stator powered by a multiphase voltage inverter, the multiphase voltage inverter being powered via a high-voltage DC bus, the system receiving as an input a torque setpoint of an electric-vehicle computer, the system comprising:
- a first circuit for the dynamic control of the torque setpoint, comprising:
- a first sub-circuit configured to determine bus power on the DC bus upstream of the multiphase voltage inverter, and
- a second sub-circuit configured to determine a dynamic correction of torque ripple based on said bus power on the DC bus upstream of the multiphase voltage inverter;
- and
- a second circuit for determining setpoints for powering the electric motor as a function of the torque setpoint and as a function of the dynamic correction of torque ripple determined by the second sub-circuit.
A method for controlling a multiphase electric motor fitted to a motor vehicle, said motor including a rotor powered by a voltage chopper or a rotor with permanent magnets, and a stator powered by a multiphase voltage inverter, the multiphase voltage inverter being powered via a DC high-voltage bus, the powering of the motor being determined as a function of a torque setpoint dependent on a request of a driver, the method comprising:
- receiving at a first circuit, said torque setpoint;
- determining, in a first subcircuit of the first circuit, bus power on said DC high-voltage bus upstream of the multiphase voltage inverter;
- determining, in a second subcircuit of the first circuit, a dynamic correction of torque ripple based on said bus power on said DC high-voltage bus upstream of the multiphase voltage inverter;
- and
- determining, in a second circuit, setpoints for powering the motor dependent on the determined dynamic correction of torque ripple and dependent on the received torque setpoint.
Dependencies are inferred from the claim text.