Sinusoidal stimulus response for input power health diagnostic

Patent metadata

Field	Value
Publication number	US-11892519-B2
Application number	US-202217733434-A
Country	US
Kind code	B2
Filing date	Apr 29, 2022
Priority date	Apr 29, 2022
Publication date	Feb 6, 2024
Grant date	Feb 6, 2024

Abstract

Technical solutions are described for diagnosing an input power supply providing power to a motor. A method includes: generating a sinusoidal stimulus signal; applying, using the input power supply, the sinusoidal stimulus signal to the motor; measuring a response to the sinusoidal stimulus signal; determining a degraded condition of the input power supply based on the response to the sinusoidal stimulus signal; and performing an action in response to determining the degraded condition of the input power supply.

First claim

What is claimed is:

1. A method for diagnosing an input power supply providing power to a motor, the method comprising:
generating a sinusoidal stimulus signal;
applying, using the input power supply, the sinusoidal stimulus signal to the motor;
measuring a response to the sinusoidal stimulus signal;
calculating, based on the response to the sinusoidal stimulus signal, a metric indicative of a status of the input power supply;
determining a degraded condition of the input power supply based on the response to the sinusoidal stimulus signal; and
performing an action in response to determining the degraded condition of the input power supply.

2. The method of claim 1 , wherein the sinusoidal stimulus signal is a non-torque producing voltage that causes the motor to produce zero net torque.

3. The method of claim 1 , wherein applying the sinusoidal stimulus signal to the motor includes switching, by an inverter, a DC power having a bridge voltage, and wherein the response to the sinusoidal stimulus signal includes a sinusoidal voltage component of the bridge voltage.

4. The method of claim 3 , wherein the sinusoidal stimulus signal has a stimulus frequency and the sinusoidal voltage component of the bridge voltage has a response frequency equal to twice the stimulus frequency.

5. The method of claim 1 , wherein generating the sinusoidal stimulus signal includes generating a discretized sinusoidal stimulus signal approximating a sinusoid.

6. The method of claim 5 , wherein generating the discretized sinusoidal stimulus signal includes generating a discretized periodic ramp signal, and determining the discretized sinusoidal stimulus signal based on the discretized periodic ramp signal.

7. The method of claim 5 , wherein generating the discretized sinusoidal stimulus signal includes determining a value using a term to compensate for jitter introduced by an inconsistency in timing to perform at least one calculation.

8. The method of claim 1 , wherein determining the degraded condition of the input power supply includes estimating a harness resistance value using a statistical model.

9. The method of claim 8 , wherein estimating the harness resistance value using the statistical model includes computing a harness resistance estimate based on a magnitude of the response to the sinusoidal stimulus signal and an average of the response to the sinusoidal stimulus signal.

10. A method for diagnosing an input power supply providing power to a motor, the method comprising:
generating a stimulus signal having a stimulus magnitude;
applying, using the input power supply, the stimulus signal to the motor;
measuring a response to the stimulus signal;
determining a degraded condition of the input power supply based on the response to the stimulus signal; and
performing an action in response to determining a degraded condition of the input power supply,
wherein the degraded condition of the input power supply includes a harness resistance value, and
wherein generating the stimulus signal includes determining the stimulus magnitude based on an estimate of the harness resistance value.

11. The method of claim 10 , wherein the stimulus signal includes a sinusoidal stimulus signal.

12. The method of claim 10 , wherein determining the stimulus magnitude based on the estimate of the harness resistance value includes determining a maximum stimulus magnitude to maintain a bridge voltage of the input power supply above a predetermined value.

13. The method of claim 10 , wherein determining the stimulus magnitude based on the estimate of the harness resistance value further includes determining a maximum stimulus magnitude based on an approximation of a battery voltage of the input power supply.

14. A system for diagnosing an input power supply providing power to a motor, the system comprising:
a processor and a memory including instructions that, when executed by the processor, cause the processor to:
generate a sinusoidal stimulus signal;
apply, using the input power supply, the sinusoidal stimulus signal to the motor;
measure a response to the sinusoidal stimulus signal;
determine a degraded condition of the input power supply based on the response to the sinusoidal stimulus signal; and
perform an action in response to determining the degraded condition of the input power supply.

15. The system of claim 14 , wherein the sinusoidal stimulus signal is a non-torque producing voltage that causes the motor to produce zero net torque.

16. The system of claim 14 , wherein applying the sinusoidal stimulus signal to the motor includes the instructions causing the processor to cause an inverter to switch a DC power having a bridge voltage, and wherein the response to the sinusoidal stimulus signal includes a sinusoidal voltage component of the bridge voltage.

17. The system of claim 16 , wherein the sinusoidal stimulus signal has a stimulus frequency and the sinusoidal voltage component of the bridge voltage has a response frequency equal to twice the stimulus frequency.

18. The system of claim 14 , wherein generating the sinusoidal stimulus signal includes generating a discretized sinusoidal stimulus signal approximating a sinusoid.

19. The system of claim 18 , wherein generating the discretized sinusoidal stimulus signal includes generating a discretized periodic ramp signal, and determining the discretized sinusoidal stimulus signal based on the discretized periodic ramp signal.

20. The system of claim 18 , wherein generating the discretized sinusoidal stimulus signal includes determining a value using a term to compensate for jitter introduced by an inconsistency in timing of calculations.

Assignees

• Steering Solutions Ip Holding

Inventors

• Gizinski Nicholas E
• Kleinau Julie A
• Williams David M
• Larson Clayton D
• Collier-Hallman Steven J
• Verma Ashish

Classifications

• G01R31/40 Primary

  Testing power supplies (testing photovoltaic devices H02S50/10) · CPC title

• B62D5/046

  Controlling the motor · CPC title

• G01R31/392

  Determining battery ageing or deterioration, e.g. state of health · CPC title

• H02P6/04

  Arrangements for controlling or regulating the speed or torque of more than one motor (H02P6/10 takes precedence) · CPC title

• B62D5/0481 Primary

  monitoring the steering system, e.g. failures · CPC title