System and method for seat vibration cancellation

Patent metadata

Field	Value
Publication number	US-11427115-B2
Application number	US-202017133585-A
Country	US
Kind code	B2
Filing date	Dec 23, 2020
Priority date	Nov 6, 2019
Publication date	Aug 30, 2022
Grant date	Aug 30, 2022

Abstract

A method for cancelling seat vibration includes receiving, from an accelerometer, a plurality of accelerometer measurements and applying a first filter to the plurality of accelerometer measurements to remove accelerometer measurements of the plurality of accelerometer measurements having a frequency above a first threshold frequency. The method also includes applying a second filter to an output of the first filter to remove accelerometer measurements of the output of the first filter having a frequency above a second threshold frequency and applying a third filter to an output of the second filter to generate an accelerometer measurement output having a center frequency corresponding to a resonant frequency of the vibration of the at least one component of the seat. The method also includes determining an absolute magnitude value of the accelerometer measurement output and selectively controlling a motor based on the absolute magnitude value of the accelerometer measurement output.

First claim

What is claimed is:

1. A system for cancelling seat vibration, the system comprising:
a motor in mechanical communication with a control arm;
a processor; and
a memory that includes instructions that, when executed by the processor, cause the processor to:
receive, from an accelerometer, a plurality of accelerometer measurements associated with acceleration corresponding to vibration of at least a component of a seat;
apply a first filter to the plurality of accelerometer measurements to remove accelerometer measurements of the plurality of accelerometer measurements having a frequency above a first threshold frequency;
apply a second filter to an output of the first filter to remove accelerometer measurements of the output of the first filter having a frequency above a second threshold frequency;
apply a third filter to an output of the second filter to generate an accelerometer measurement output having a center frequency corresponding to a resonant frequency of the vibration of the at least one component of the seat;
determine an absolute magnitude value of the accelerometer measurement output; and
selectively control the motor based on the absolute magnitude value of the accelerometer measurement output.

2. The system of claim 1 , wherein the first filter includes a low pass filter and wherein the first threshold corresponds to a cutoff frequency of the first filter, the cutoff frequency corresponding to a result of a product of the resonant frequency of the vibration of the at least one component of the seat and a predetermined value.

3. The system of claim 2 , wherein the predetermined value is 3.

4. The system of claim 1 , wherein the second filter includes a low pass filter and wherein the second threshold corresponds to a cutoff frequency of the second filter, the cutoff frequency corresponding to a result of a product of the resonant frequency of the vibration of the at least one component of the seat and a predetermined value.

5. The system of claim 4 , wherein the predetermined value is 2.

6. The system of claim 1 , wherein the first filter and the second filter are configured in a cascade arrangement.

7. The system of claim 1 , wherein the third filter includes a narrow notch band pass filter.

8. The system of claim 7 , wherein a filter bandwidth of the third filter is less than a product of the resonant frequency of the vibration of the at least one component of the seat and 0.1.

9. The system of claim 1 , wherein the instructions further cause the processor to determine the absolute magnitude value of the accelerometer measurement output by applying an average filter to the accelerometer measurement output.

10. The system of claim 1 , wherein the instructions further cause the processor to:
determine a scaled value corresponding to the absolute magnitude value of the accelerometer measurement output and a predetermined range;
identify a velocity damping value corresponding to the accelerometer measurement output;
apply the scaled value to the velocity damping value; and
selectively control the motor further based on the velocity damping value.

11. The system of claim 10 , wherein the predetermined range includes 0.0 to 1.0.

12. A method for cancelling seat vibration, the method comprising:
receiving, from an accelerometer, a plurality of accelerometer measurements associated with acceleration corresponding to vibration of at least a component of a seat;
applying a first filter to the plurality of accelerometer measurements to remove accelerometer measurements of the plurality of accelerometer measurements having a frequency above a first threshold frequency;
applying a second filter to an output of the first filter to remove accelerometer measurements of the output of the first filter having a frequency above a second threshold frequency;
applying a third filter to an output of the second filter to generate an accelerometer measurement output having a center frequency corresponding to a resonant frequency of the vibration of the at least one component of the seat;
determining an absolute magnitude value of the accelerometer measurement output; and
selectively controlling a motor based on the absolute magnitude value of the accelerometer measurement output.

13. The method of claim 12 , wherein the first filter includes a low pass filter and wherein the first threshold corresponds to a cutoff frequency of the first filter, the cutoff frequency corresponding to a result of a product of the resonant frequency of the vibration of the at least one component of the seat and a predetermined value.

14. The method of claim 13 , wherein the predetermined value is 3.

15. The method of claim 12 , wherein the second filter includes a low pass filter and wherein the second threshold corresponds to a cutoff frequency of the second filter, the cutoff frequency corresponding to a result of a product of the resonant frequency of the vibration of the at least one component of the seat and a predetermined value.

16. The method of claim 15 , wherein the predetermined value is 2.

17. The method of claim 12 , wherein the first filter and the second filter are configured in a cascade arrangement.

18. The method of claim 12 , wherein the third filter includes a narrow notch band pass filter.

19. The method of claim 18 , wherein a filter bandwidth of the third filter is less than a product of the resonant frequency of the vibration of the at least one component of the seat and 0.1.

20. A vehicle seat apparatus comprising:
a brushless servo motor in mechanical communication with control arm, the control arm extends from a seat top plate to a base mount plate;
a controller configured to:
receive, from an accelerometer, a plurality of accelerometer measurements associated with acceleration corresponding to vibration of at least a component of a seat, the accelerometer being disposed on the base mount plate of the seat;
apply a first filter to the plurality of accelerometer measurements to remove accelerometer measurements of the plurality of accelerometer measurements having a frequency above a first threshold frequency;
apply a second filter to an output of the first filter to remove accelerometer measurements of the output of the first filter having a frequency above a second threshold frequency;
apply a third filter to an output of the second filter to generate an accelerometer measurement output having a center frequency corresponding to a resonant frequency of the vibration of the at least one component of the seat;
determine an absolute magnitude value of the accelerometer measurement output;
determine a scaled value corresponding to the absolute magnitude value of the accelerometer measurement output and a predetermined range;
identify a velocity damping value corresponding to the accelerometer measurement output;
apply the scaled value to the velocity damping value; and
selectively control the motor based on the absolute magnitude value of the accelerometer measurement output and the velocity damping value.

Assignees

• Steering Solutions Ip Holding

Inventors

• Maust Brian G
• Helmreich Benjamin H
• Douglas Christopher R

Classifications

• B60N2/502

  attached to the base of the seat (B60N2/504 takes precedence) · CPC title

• B60N2/24

  for particular purposes or particular vehicles · CPC title

• F16F15/022

  using dampers and springs in combination · CPC title

• B60N2/508

  Scissors-like structure · CPC title

• B60N2/501 Primary

  actively controlled suspension, e.g. electronic control · CPC title