Method for online direct estimation and compensation of flux and torque errors in electric drives

Patent metadata

Field	Value
Publication number	US-2021197839-A1
Application number	US-201916730218-A
Country	US
Kind code	A1
Filing date	Dec 30, 2019
Priority date	Dec 30, 2019
Publication date	Jul 1, 2021
Grant date	—

Abstract

An online method of detecting and compensating for errors in flux estimation in operation of a motor system. The method includes determining a voltage compensation term by comparing an expected voltage and an actual voltage. The method also includes determining a flux compensation term by passing the voltage compensation term through a low-pass filter, and determining a corrected flux component value by comparing the flux compensation term with a flux value obtained from a look-up table, wherein the low-pass filter receives operating parameters based on data regarding an operating environment of the motor system. The method then further determines a corrected torque value based on the corrected flux component value.

First claim

What is claimed is:

1 . A method of detecting and compensating for errors in flux estimation during operation of a motor system, comprising:
determining a voltage compensation term by comparing an expected voltage and an actual voltage; determining a flux compensation term by passing the voltage compensation term through a low-pass filter; and determining a corrected flux component value by comparing the flux compensation term with a look-up table flux value; wherein the low-pass filter receives operating parameters based on data regarding an operating environment of the motor system.

2 . The method of claim 1 , wherein the method further determines a corrected torque value based on the corrected flux component value.

3 . The method of claim 1 , wherein the received operating parameters include at least one of a cutoff frequency and a period length.

4 . The method of claim 1 , wherein data regarding the operating environment of the vehicle includes data regarding at least one of heat, aging, and saturation of at least one component of the motor system.

5 . A system for detecting and compensating for errors in flux during operation of a motor system, comprising:
a sensor system, wherein the sensor system is configured to receive data regarding an operating environment of the motor system from at least one sensor; and a controller, wherein the controller is configured to receive operating data based on data regarding the operating environment of the motor system, and wherein the controller is configured to detect and compensate for errors in flux estimation in operation of the motor system, wherein the controller is configured to:
determine a voltage compensation term by comparing an expected voltage and an actual voltage;
determine a flux compensation term by passing the voltage compensation term through a low-pass filter;
and determine a corrected flux component value by comparing the flux compensation term with a flux value stored in a look-up table;
wherein the low-pass filter receives operating parameters based on data regarding the operating environment of the motor system.

6 . The system of claim 5 , wherein the method further determines a corrected torque value based on the corrected flux component value.

7 . The system of claim 5 , wherein the received operating parameters include at least one of a cutoff frequency and a period length.

8 . The system of claim 5 , wherein data regarding the operating environment of the vehicle includes data regarding at least one of heat, aging, and saturation of at least one component of the motor system.

Assignees

• Karma Automotive Llc

Inventors

• Shabestari Parisa Mohammadalizadeh
• Sangsefidi Younes
• Niu Geng

Classifications

• B60W2510/087

  Temperature · CPC title

• B60W10/08

  including control of electric propulsion units, e.g. motors or generators · CPC title

• B60W50/029 Primary

  Adapting to failures or work around with other constraints, e.g. circumvention by avoiding use of failed parts · CPC title

• B60W50/0205 Primary

  Diagnosing or detecting failures; Failure detection models · CPC title

• B60W2050/0056

  Low-pass filters · CPC title