Method and apparatus for an adjustable damper

• US 10,670,106 B2
• Filed: 07/26/2018
• Issued: 06/02/2020
• Est. Priority Date: 01/07/2009
• Status: Active Grant

• Current Assignee: Fox Factory Incorporated
• Original Assignee: Fox Factory Incorporated
• Inventors: Ericksen, Everet Owen, O'Neal, George, McLellan, Matt
• Primary Examiner(s): Lane, Nicholas J
• Application Number:
  US16/046,497
• Publication Number:
  US 20180355946A1
• Time in Patent Office: 677 Days
• CPC Class Codes: B60G 17/0161 mainly during straight-line motion B60G17/0164 takes precedence
• CPC Class Codes: B60G 17/01908 Acceleration or inclination sensors characterised by the use of gyroscopes B60G21/08
• CPC Class Codes: F16F 9/512 Means responsive to load action, i.e. static load on the damper or dynamic fluid pressure changes in the damper, e.g. due to changes in velocity F16F9/504, F16F9/516 take precedence; non-automatic damper adjustment from a distance using servo control, the servo pressure being created by the flow of damping fluid F16F9/465; self-pumping fluid springs in vehicle suspensions B60G17/044
• CPC Class Codes: F16F 9/5126 Piston, or piston-like valve elements F16F9/504 takes precedence

Abstract

A method for controlling vehicle motion is described. The method includes: comparing a measured acceleration value associated with a movement of a vehicle component of a vehicle with a predetermined acceleration threshold value that corresponds to the vehicle component to determine if the vehicle is experiencing a free-fall, wherein the vehicle component is coupled with a frame of the vehicle via at least one vehicle suspension damper; monitoring a state of at least one valve within at least one vehicle suspension damper of the vehicle, wherein the state controls a damping force within the at least one vehicle suspension damper; and based on the comparing and the monitoring, regulating damping forces within the at least one vehicle suspension damper by actuating the at least one valve to adjust to a soft mode and to provide a cushioned landing for the vehicle, such that an acceleration of the frame is reduced.

Claims

1. A non-transitory computer readable storage medium having stored thereon, computer-executable instructions that, when executed by a computer, cause said computer to perform a method for controlling vehicle motion, said method comprising:

determining if said vehicle is experiencing free-fall by determining that a vehicle component is experiencing a zero-g for a preprogrammed duration of time, wherein said vehicle component is coupled with a frame of said vehicle via at least one vehicle suspension damper;

monitoring a state of at least one pilot valve within said at least one vehicle suspension damper, wherein said state controls a damping force within said at least one vehicle suspension damper, said damping force controlling a flow of damping fluid from a damping cylinder interior of said at least one vehicle suspension damper to an annular reservoir at least partially surrounding said damping cylinder reservoir, said at least one pilot valve comprising;

a pilot spool having a metering edge, said pilot spool disposed within a bleed passage centrally located about an axis of said damping cylinder interior and said annular reservoir;

at least one port disposed fluidically coupling said damping cylinder interior and said annular reservoir via said bleed passage, said at least one port further disposed to selectively be at least partially obstructed by said metering edge of said pilot spool;

an armature coupled to said pilot spool; and

a coil disposed proximate said armature such that current applied to said coil is able to generate motion of said armature and said pilot spool to cause said metering edge of said pilot spool to at least partially obstruct said at least one port, said motion of said pilot spool affecting pressure such that greater obstruction of said at least one port also increases closing pressure applied to valve shims of said at least one vehicle suspension damper; and

based on said determining and said monitoring, regulating damping forces within said at least one vehicle suspension damper by actuating said at least one pilot valve to adjust to a soft mode to provide a cushioned landing for said vehicle, such that an acceleration of said frame is reduced.

2. The non-transitory computer readable storage medium of claim 1, wherein said method further comprises:

before said regulating, determining a mode switch setting for said at least one vehicle suspension damper.

3. The non-transitory computer readable storage medium of claim 1, wherein said regulating damping forces within said at least one vehicle suspension damper by actuating said at least one pilot valve to adjust to said soft mode to provide said cushioned landing for said vehicle, such that an acceleration of said frame is reduced comprises:

sending a first activation signal to a power source of said at least one vehicle suspension damper, said first activation signal activating said power source to deliver a current to said at least one pilot valve, wherein upon delivery of said current, said at least one pilot valve adjusts to said soft mode.

4. The non-transitory computer readable storage medium of claim 1, wherein said method further comprises:

determining that said vehicle component is experiencing a zero-g for a preprogrammed number of seconds.

5. The non-transitory computer readable storage medium of claim 4, wherein said method further comprises:

determining that said vehicle component is experiencing said zero-g for more than 10 milliseconds.

6. The non-transitory computer readable storage medium of claim 1, wherein said method further comprises:

sending an activation signal to a power source of said at least one vehicle suspension damper, said activation signal activating said power source to deliver a current to said at least one pilot valve, wherein upon delivery of said current, said at least one pilot valve adjusts to said soft mode.

7. A system for controlling vehicle motion, said system comprising:

an electronic valve of at least one vehicle suspension damper attached to a vehicle, said electronic valve configured for adjusting a damping force therein, said damping force controlling a flow of damping fluid from a damping cylinder interior of said at least one vehicle suspension damper to an annular reservoir at least partially surrounding said damping cylinder reservoir, said electronic valve comprising;

a pilot spool having a metering edge, said pilot spool disposed within a bleed passage centrally located about an axis of said damping cylinder interior and said annular reservoir;

at least one port disposed fluidically coupling said damping cylinder interior and said annular reservoir via said bleed passage, said at least one port further disposed to selectively be at least partially obstructed by said metering edge of said pilot spool;

an armature coupled to said pilot spool; and

a coil disposed proximate said armature such that current applied to said coil is able to generate motion of said armature and said pilot spool to cause said metering edge of said pilot spool to at least partially obstruct said at least one port, said motion of said pilot spool affecting pressure such that greater obstruction of said at least one port also increases closing pressure applied to valve shims of said at least one vehicle suspension damper; and

a control system coupled to said electronic valve, said control system comprising;

a control signal accessor configured for accessing a first set of control signals, wherein at least one control signal of said first set of control signals comprises a measured acceleration value associated with a movement of a vehicle component of said vehicle, wherein said vehicle component is coupled with a frame of said vehicle via at least one vehicle suspension damper;

a comparer configured for determining if said vehicle is experiencing free-fall by determining that a vehicle component is experiencing a zero-g for a preprogrammed duration of time;

a valve monitor configured for monitoring a state of said electronic valve, wherein said state controls a damping force within said at least one vehicle suspension damper; and

an activation signal sender configured for, based on said comparing and said monitoring, regulating damping forces within said at least one vehicle suspension damper by actuating said electronic valve to adjust to a soft mode to provide a cushioned landing for said vehicle, such that an acceleration of said frame is reduced.

8. The system of claim 7, further comprising:

a mode determiner configured for determining a mode switch setting for said at least one vehicle suspension damper.

9. The system of claim 7, further comprising:

a timer configured for determining an amount of time said vehicle component is experiencing said zero-g.

10. The system of claim 7, further comprising:

a timer applicator configured for setting a timer configured for holding said electronic valve in said soft mode for a predetermined period of time.

11. A non-transitory computer readable storage medium having stored thereon, computer-executable instructions that, when executed by a computer, cause said computer to perform a method for controlling vehicle motion to provide a cushioned landing for a vehicle, said method comprising:

determining if said vehicle is experiencing free-fall by determining that a vehicle component is experiencing a zero-g for a preprogrammed duration of time, wherein said vehicle component is coupled with a frame of said vehicle via at least one vehicle suspension damper;

monitoring a state of at least one pilot valve within said at least one vehicle suspension damper, wherein said state controls a damping force within said at least one vehicle suspension damper, said damping force controlling a flow of damping fluid from a damping cylinder interior of said at least one vehicle suspension damper to an annular reservoir at least partially surrounding said damping cylinder reservoir, said at least one pilot valve comprising;

a pilot spool having a metering edge, said pilot spool disposed within a bleed passage centrally located about an axis of said damping cylinder interior and said annular reservoir;

at least one port disposed fluidically coupling said damping cylinder interior and said annular reservoir via said bleed passage, said at least one port further disposed to selectively be at least partially obstructed by said metering edge of said pilot spool;

an armature coupled to said pilot spool; and

a coil disposed proximate said armature such that current applied to said coil is able to generate motion of said armature and said pilot spool to cause said metering edge of said pilot spool to at least partially obstruct said at least one port, said motion of said pilot spool affecting pressure such that greater obstruction of said at least one port also increases closing pressure applied to valve shims of said at least one vehicle suspension damper;

based on said determining and said monitoring, regulating damping forces within said at least one vehicle suspension damper by actuating said at least one pilot valve to adjust to a soft mode to provide said cushioned landing for said vehicle, such that an acceleration of said frame is reduced, wherein said regulating damping forces within said at least one vehicle suspension damper by actuating said at least one pilot valve to adjust to said soft mode to provide said cushioned landing for said vehicle, such that an acceleration of said frame is reduced comprises;

sending a first activation signal to a power source of said at least one vehicle suspension damper, said first activation signal activating said power source to deliver a current to said at least one pilot valve, wherein upon delivery of said current, said at least one pilot valve adjusts to said soft mode; and

before said regulating, determining a mode switch setting for said at least one vehicle suspension damper.

12. The non-transitory computer readable storage medium of claim 11, wherein said method further comprises:

determining that said vehicle component is experiencing a zero-g for a preprogrammed number of seconds.

13. The non-transitory computer readable storage medium of claim 12, wherein said method further comprises:

determining that said vehicle component is experiencing said zero-g for more than 10 milliseconds.

14. The non-transitory computer readable storage medium of claim 11, wherein said method further comprises:

utilizing a sensor to obtain a measured acceleration value associated with said movement of said vehicle component of said vehicle wherein said measured acceleration is obtained independent of an orientation of said sensor.

15. The non-transitory computer readable storage medium of claim 11, wherein said method further comprises:

sending an activation signal to a power source of said at least one vehicle suspension damper, said activation signal activating said power source to deliver a current to said at least one pilot valve, wherein upon delivery of said current, said at least one pilot valve adjusts to said soft mode.