Systems and methods for controlling a vehicle including friction control device

Patent metadata

Field	Value
Publication number	US-10053109-B2
Application number	US-201615055148-A
Country	US
Kind code	B2
Filing date	Feb 26, 2016
Priority date	Feb 26, 2016
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

Systems and methods for controlling a vehicle including a friction control device are provided. A method of controlling the vehicle includes operating at least one friction control device in a first of a plurality of friction modes, detecting a vehicular speed, changing operation of the at least one friction control device from the first friction mode to a second of the plurality of friction modes in response to the vehicular speed exceeding a first threshold speed value, and changing operation of the at least one friction control device from the second friction mode to the first friction mode in response to the vehicular speed falling below a second threshold speed value that is less than the first threshold speed value. The second friction mode is associated with a higher level of resistance than the first friction mode.

First claim

What is claimed is:

1. A method of controlling a vehicle, the method comprising:
operating at least one friction control device in a first of a plurality of friction modes, the first friction mode associated with a first speed range, the at least one friction control device including one of a suspension damper, a control arm ball joint, a strut bearing, a steering rack guide, and an outer tie rod ball joint;
detecting a vehicular speed;
changing operation of the at least one friction control device from the first friction mode to a second of the plurality of friction modes in response to the vehicular speed exceeding a first threshold speed value, wherein the second friction mode is associated with a higher level of resistance than the first friction mode and a second speed range that overlaps the first speed range by a first amount;
changing operation of the at least one friction control device from the second friction mode to the first friction mode in response to the vehicular speed falling below a second threshold speed value that is less than the first threshold speed value; and
changing operation of the at least one friction control device from the second friction mode to a third of the plurality of friction modes in response to the vehicular speed exceeding a third threshold value greater than the first threshold value, wherein the third friction mode is associated with a higher level of resistance than the second friction mode and a third speed range that overlaps the second speed range by a second amount greater than the first amount.

2. The method of claim 1 , wherein the first, second, and third speed ranges and the first and second amounts are defined by a friction mode schedule, and wherein changing operation of the at least one friction control device comprises changing operation of the at least one friction control device according to the friction mode schedule.

3. The method of claim 1 , wherein changing operation of the at least one friction control device from the first friction mode to the second friction mode comprises increasing one of a friction force and a friction torque of the at least one friction control device.

4. The method of claim 1 further comprising controlling operation of the at least one friction control device such that successive changes between the first friction mode and the second friction mode are enabled only after a predetermined amount of time has elapsed.

5. The method of claim 1 , wherein detecting the vehicular speed includes detecting the vehicular speed using a speed sensor, the method further comprises decreasing a speed signal resolution of the speed sensor when the vehicular speed is within a predetermined range of one of the first and the second threshold speed values.

6. The method of claim 1 , further comprising:
detecting a vertical acceleration rate of the vehicle; and
changing operation of the at least one friction control device from the first friction mode to a first enhanced friction mode of a plurality of enhanced friction modes in response to the vertical acceleration rate exceeding a threshold acceleration rate while the vehicular speed is within the first speed range, wherein the first enhanced friction mode is associated with a higher level of resistance than the first friction mode.

7. The method of claim 6 , wherein the first friction mode and the first enhanced friction mode are both associated with the first speed range.

8. The method of claim 1 , further comprising:
detecting a vertical acceleration rate of the vehicle; and
changing operation of the at least one friction control device from the first friction mode to a second enhanced friction mode of a plurality of enhanced friction modes in response to both the vehicular speed exceeding the first threshold speed value and the vertical acceleration rate exceeding a threshold vertical acceleration value, wherein the second enhanced friction mode is associated with a higher level of resistance than the second friction mode.

9. The method of claim 8 , wherein the second friction mode and the second enhanced friction mode are associated with the second speed range.

10. A vehicle control system for use in controlling operation of a vehicle, the system comprising:
at least one friction control device configured to operate in a first of a plurality of friction modes, the first friction mode associated with a first speed range, the at least one friction control device comprising one of a suspension damper, a control arm ball joint, a strut bearing, a steering rack guide, and an outer tie rod ball joint; and
a controller communicatively coupled to the at least one friction control device, the controller configured to:
detect a vehicular speed of the vehicle;
change operation of the at least one friction control device from the first friction mode to a second of the plurality of friction modes in response to the vehicular speed exceeding a first threshold speed value, the second friction mode associated with a higher level of resistance than the first friction mode and a second speed range that overlaps the first speed range by a first amount;
change operation of the at least one friction control device from the second friction mode to the first friction mode in response to the vehicular speed falling below a second threshold speed value that is less than the first threshold speed value; and
change operation of the at least one friction control device from the second friction mode to a third of the plurality of friction modes in response to the vehicular speed exceeding a third threshold value greater than the first threshold value, wherein the third friction mode is associated with a higher level of resistance than the second friction mode and a third speed range that overlaps the second speed range by a second amount greater than the first amount.

11. The system of claim 10 , wherein the controller comprises a processor communicatively coupled to a memory device having a friction mode schedule stored thereon, the friction mode schedule defining the first, second, and third speed ranges and the first and second amounts, wherein the controller is configured to change operation of the at least one friction control device between the plurality of friction modes according to the friction mode schedule.

12. The system of claim 10 , wherein the controller is configured to change operation of the at least one friction control device from the first friction mode to the second friction mode by increasing one of a friction force and a friction torque of the at least one friction control device.

13. The system of claim 10 , wherein the controller is configured to control operation of the at least one friction control device such that successive changes between the first friction mode and the second friction mode are enabled only after a predetermined amount of time has elapsed.

14. The system of claim 10 further comprising a speed sensor communicatively coupled to the controller and configured to detect the vehicular speed of the vehicle, wherein the controller is configured to decrease a speed signal resolution of the speed sensor when the vehicular speed is within a predetermined speed range of one of the first threshold speed value and the second threshold speed value.

15. The system of claim 10 , wherein the at least one friction control device comprises an upper control arm ball joint.

16. The system of claim 10 , wherein the at least one friction control device comprises a plurality of friction control devices and at least two friction control devices of the plurality of friction co

Assignees

• Yu Jinghong
• Honda Motor Co Ltd

Inventors

• Yu Jinghong

Classifications

• B60W2520/10

  Longitudinal speed · CPC title

• B60W10/22

  including control of suspension systems · CPC title

• G05D1/0066

  for limitation of acceleration or stress · CPC title

• B60W2710/20

  Steering systems · CPC title

• B60W10/20

  including control of steering systems · CPC title