Control system for compensating for current sensor offset/gain errors

Patent metadata

Field	Value
Publication number	US-12365247-B2
Application number	US-202318200087-A
Country	US
Kind code	B2
Filing date	May 22, 2023
Priority date	May 22, 2023
Publication date	Jul 22, 2025
Grant date	Jul 22, 2025

Abstract

A control system configured to control an electric motor of an electric vehicle (EV) includes a current sensor offset detector that determines an offset of one or more current sensors; a gain compensator that determines a second order harmonic component in d- and q-axis currents due to gain errors in one or more sensors; and a controller that generates a control signal that compensates for the offset or gain error mismatch of the current sensor(s).

First claim

What is claimed is:

1. A control system configured to control an electric motor of an electric vehicle (EV), comprising:
a current sensor offset detector that determines an offset of one or more current sensors;
a gain compensator that determines a second order harmonic component in d- and q-axis currents due to gain errors in one or more sensors; and
a controller that generates a control signal that compensates for the offset or gain error mismatch of the current sensor(s).

2. The control system recited in claim 1 , wherein the controller determines the offset or the second order harmonic component in d- and q-axis currents due to gain errors without knowledge of an angular position of an output shaft of the electric motor.

3. The control system recited in claim 1 , wherein the control signal is provided to an inverter electrically coupled to the electric motor.

4. The control system recited in claim 1 , wherein controller compensates for the second order harmonic component.

5. A control system configured to control an electric motor of an electric vehicle (EV), comprising:
an electric motor included in the EV;
a three-phase inverter electrically coupled to the electric motor;
a vehicle battery electrically coupled to the inverter; and
a controller including a current sensor offset detector that determines a second order harmonic component in d- and q-axis currents due to gain error in one or more current sensors; a gain compensator that determines a gain of the one or more sensors, wherein the controller generates a control signal that compensates for the offset or gain of the current sensor(s).

6. The control system recited in claim 5 , wherein the controller determines the offset or gain without knowledge of an angular position of an output shaft of the electric motor.

7. The control system recited in claim 5 , wherein the controller compensates for a second order harmonic component.

8. A method of controlling an electric motor of an electric vehicle (EV), comprising:
(a) receiving a control signal for the electric motor;
(b) determining an offset for one or more current sensors;
(c) determining a second order harmonic component in d- and q-axis currents due to gain errors in the one or more current sensors;
(d) modifying the control signal to compensate for the second order harmonic component in d- and q-axis currents due to gain errors, the offset, or both the gain and offset; and
(e) communicating the modified control signal to the electric motor of the EV.

9. The method recited in claim 8 , wherein steps (b) and (c) are carried out without knowing an angular position of an output shaft of the electric motor.

10. The method recited in claim 8 , wherein step (d) compensates for a second order harmonic component.

11. The method recited in claim 8 , further comprising the step of providing the control signal to an inverter electrically coupled to the electric motor.

Assignees

• Borgwarner Inc

Inventors

• Emeghara Chikezie M
• Eldeeb Hassan H
• Ballal Siddharth
• Secrest Caleb W

Classifications

• B60L15/20

  for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed · CPC title

• B60L53/20

  characterised by converters located in the vehicle · CPC title

• B60L2240/429

  Current · CPC title

• G01R19/2506

  Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values (G01R19/003 takes precedence); Details concerning sampling, digitizing or waveform capturing (displaying waveforms G01R13/00; analog sampling G01R19/0053) · CPC title

• H02P27/06

  using DC to AC converters or inverters (H02P27/05 takes precedence) · CPC title