Reduced control cycle current regulator for vehicle electric traction motor

A system in a vehicle, comprising:

• a current regulator configured to obtain current commands from a controller based on a torque input and provide voltage commands;
• an inverter configured to use the voltage commands from the current regulator and direct current (DC) supplied by a battery to provide alternating current (AC);
• an electric traction motor configured to provide drive power to a transmission of the vehicle based on injection of the AC from the inverter, wherein the current regulator adjusts parameters of a transfer function implemented by the current regulator, based on feedback of an input to and an output from the electric traction motor to achieve the AC corresponding with the torque input;
• a forward prediction filter configured to obtain the feedback of the input to the electric traction motor and provide a prediction of direct-axis current Id and quadrature-axis current Iq in a next control cycle to the current regulator;
• and
• a differentiator configured to obtain the feedback of the output from the electric traction motor and provide a shaft speed of the electric traction motor to the controller and the current regulator;
• wherein the current regulator includes look-up tables or polynomial functions to provide inductance values to adjust the parameters of the transfer function based on the direct-axis current Id and the quadrature-axis current Iq from the forward prediction filter or based on the current commands from the controller.

A system in a vehicle, comprising:

• a current regulator configured to obtain current commands from a controller based on a torque input and provide voltage commands;
• an inverter configured to use the voltage commands from the current regulator and direct current (DC) supplied by a battery to provide alternating current (AC);
• an electric traction motor configured to provide drive power to a transmission of the vehicle based on injection of the AC from the inverter, wherein the current regulator adjusts parameters of a transfer function implemented by the current regulator, based on feedback of an input to and an output from the electric traction motor to achieve the AC corresponding with the torque input;
• a forward prediction filter configured to obtain the feedback of the input to the electric traction motor and provide a prediction of direct-axis current Id and quadrature-axis current Iq in a next control cycle to the current regulator;
• and
• a differentiator configured to obtain the feedback of the output from the electric traction motor and provide a shaft speed of the electric traction motor to the controller and the current regulator;
• wherein the current regulator includes look-up tables or polynomial functions to provide a resistance value to adjust the parameters of the transfer function based on the shaft speed of the electric traction motor.

A system in a vehicle, comprising:

• a current regulator configured to obtain current commands from a controller based on a torque input and provide voltage commands;
• an inverter configured to use the voltage commands from the current regulator and direct current (DC) supplied by a battery to provide alternating current (AC);
• an electric traction motor configured to provide drive power to a transmission of the vehicle based on injection of the AC from the inverter, wherein the current regulator adjusts parameters of a transfer function implemented by the current regulator, based on feedback of an input to and an output from the electric traction motor to achieve the AC corresponding with the torque input;
• a forward prediction filter configured to obtain the feedback of the input to the electric traction motor and provide a prediction of direct-axis current Id and quadrature-axis current Iq in a next control cycle to the current regulator;
• and
• a differentiator configured to obtain the feedback of the output from the electric traction motor and provide a shaft speed of the electric traction motor to the controller and the current regulator;
• wherein the current regulator includes a look-up table to mitigate speed dependent error in the control of direct-axis current Id and quadrature-axis current Iq.

A method in a vehicle, comprising:

• configuring a current regulator to obtain current commands from a controller based on a torque input and provide voltage commands;
• arranging an inverter to use the voltage commands from the current regulator and direct current (DC) supplied by a battery to provide alternating current (AC);
• and
• positioning an electric traction motor to provide drive power to a transmission of the vehicle based on injection of the AC from the inverter, wherein the current regulator adjusts parameters of a transfer function implemented by the current regulator, based on feedback of an input to and an output from the electric traction motor to achieve the AC corresponding with the torque input;
• wherein the configuring the current regulator includes at least one of
• a) configuring look-up tables or polynomial functions to provide inductance values to adjust the parameters of the transfer function based on the direct-axis current Id and the quadrature-axis current Iq from the forward prediction filter or based on the current commands from the controller,
• b) configuring look-up tables or polynomial functions provides a resistance value to adjust the parameters of the transfer function based on the shaft speed of the electric traction motor, and
• c) configuring a look-up table to mitigate speed dependent error in the control of direct-axis current Id and quadrature-axis current Iq.

A method in a vehicle, comprising:

• configuring a current regulator to obtain current commands from a controller based on a torque input and provide voltage commands;
• arranging an inverter to use the voltage commands from the current regulator and direct current (DC) supplied by a battery to provide alternating current (AC);
• and
• positioning an electric traction motor to provide drive power to a transmission of the vehicle based on injection of the AC from the inverter, wherein the current regulator adjusts parameters of a transfer function implemented by the current regulator, based on feedback of an input to and an output from the electric traction motor to achieve the AC corresponding with the torque input;
• arranging a forward prediction filter to obtain the feedback of the input to the electric traction motor and to provide a prediction of direct-axis current Id and quadrature-axis current Iq in a next control cycle to the current regulator;
• and
• arranging a differentiator to obtain the feedback of the output from the electric traction motor and to provide a shaft speed of the electric traction motor to the controller and the current regulator;
• wherein the configuring the current regulator includes configuring look-up tables or polynomial functions to provide inductance values to adjust the parameters of the transfer function based on the direct-axis current Id and the quadrature-axis current Iq from the forward prediction filter or based on the current commands from the controller.

A method in a vehicle, comprising:

• configuring a current regulator to obtain current commands from a controller based on a torque input and provide voltage commands;
• arranging an inverter to use the voltage commands from the current regulator and direct current (DC) supplied by a battery to provide alternating current (AC);
• and
• positioning an electric traction motor to provide drive power to a transmission of the vehicle based on injection of the AC from the inverter, wherein the current regulator adjusts parameters of a transfer function implemented by the current regulator, based on feedback of an input to and an output from the electric traction motor to achieve the AC corresponding with the torque input;
• arranging a forward prediction filter to obtain the feedback of the input to the electric traction motor and to provide a prediction of direct-axis current Id and quadrature-axis current Iq in a next control cycle to the current regulator;
• and
• arranging a differentiator to obtain the feedback of the output from the electric traction motor and to provide a shaft speed of the electric traction motor to the controller and the current regulator;
• wherein the configuring the look-up tables or polynomial functions provides a resistance value to adjust the parameters of the transfer function based on the shaft speed of the electric traction motor.

A method in a vehicle, comprising:

• configuring a current regulator to obtain current commands from a controller based on a torque input and provide voltage commands;
• arranging an inverter to use the voltage commands from the current regulator and direct current (DC) supplied by a battery to provide alternating current (AC);
• and
• positioning an electric traction motor to provide drive power to a transmission of the vehicle based on injection of the AC from the inverter, wherein the current regulator adjusts parameters of a transfer function implemented by the current regulator, based on feedback of an input to and an output from the electric traction motor to achieve the AC corresponding with the torque input;
• arranging a forward prediction filter to obtain the feedback of the input to the electric traction motor and to provide a prediction of direct-axis current Id and quadrature-axis current Iq in a next control cycle to the current regulator;
• and
• arranging a differentiator to obtain the feedback of the output from the electric traction motor and to provide a shaft speed of the electric traction motor to the controller and the current regulator;
• wherein the configuring the current regulator includes configuring a look-up table to mitigate speed dependent error in the control of direct-axis current Id and quadrature-axis current Iq.