Method for auto-calibration of a controllable damper suspension system

• US 5,964,455 A
• Filed: 06/13/1997
• Issued: 10/12/1999
• Est. Priority Date: 06/13/1997
• Status: Expired due to Fees

• Current Assignee: Lord Corporation (Parker-Hannifin Corporation)
• Original Assignee: Lord Corporation (Parker-Hannifin Corporation)
• Inventors: Holzheimer, John C., Hamo, David J., Catanzarite, David M.
• Primary Examiner(s): Oberleitner, Robert J.
• Assistant Examiner(s): Williams, Thomas J.
• Application Number:
  US08/874,364
• Time in Patent Office: 851 Days
• Field of Search: 267/132, 267/136, 267/131, 248/550, 73/1.71, 73/1.79, 73/1.88, 73/11.04
• US Class Current: 267/131
• CPC Class Codes: B60G 17/01933 Velocity, e.g. relative velocity-displacement sensors
• CPC Class Codes: B60G 2400/25 Stroke; Height; Displacement
• CPC Class Codes: B60G 2400/252 vertical
• CPC Class Codes: B60G 2500/10 Damping action or damper
• CPC Class Codes: B60G 2600/02 Retarders, delaying means, dead zones, threshold values, cut-off frequency, timer interruption
• CPC Class Codes: B60N 2/0244 with logic circuits
• CPC Class Codes: B60N 2/0272 using sensors or detectors for detecting the position of seat parts
• CPC Class Codes: B60N 2/501 actively controlled suspension, e.g. electronic control
• CPC Class Codes: B60N 2/502 attached to the base of the seat B60N2/504 takes precedence
• CPC Class Codes: B60N 2/505 Adjustable suspension including height adjustment
• CPC Class Codes: B60N 2/508 Scissors-like structure
• CPC Class Codes: B60N 2/525 using gas
• CPC Class Codes: B62D 33/0608 pneumatic or hydraulic suspension
• CPC Class Codes: F16F 15/02 Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems F16F15/005 takes precedence ; layered products B32B; suppression of vibration in ships B63; relieving load on bearings, using magnetic means F16C39/06
• CPC Class Codes: F16F 9/48 Arrangements for providing different damping effects at different parts of the stroke F16F9/346, F16F9/516 , F16F9/53 take precedence
• CPC Class Codes: G01D 18/006 Intermittent recalibration

Abstract

A method for automatically calibrating a controller (44) for a controllable damping system (40), for example, the suspension and damping system for a truck seat or cab, includes the steps of receiving a initiation signal that is checked against criteria to ensure that calibration is actually intended. The seat (20) or other body (ex. a vehicle cab) is then moved to a first limit position, where a sensor (50, 50'"'"') reads a position signal, and to a second limit position, where another position signal is read. Preferably, a midpoint, or neutral position is calculated from the measured position signals, and the seat (20) or other body is moved to this neutral position. A range of movement is determined from the first and second position signals. Preferably, end stop limits are calculated as predetermined fractions of the range of movement value. All values are stored for use by the controllable damper system (40).

Claims

1. A method for auto-calibration of a controlled damper suspension system for a body supported on a frame, comprising the steps of:

a) receiving a signal to initiate calibration;

b) positioning the body at a first limit position;

c) determining a first limit value with a position sensor;

d) positioning the body at a second limit position;

e) determining a second limit value with the position sensor;

f) storing the first limit value and the second limit value for use by the controlled damper system; and

g) controlling a damper using the first limit value and the second limit value.

10. The method as claimed in claim 1, wherein the step of positioning the seat at said first limit position includes commanding and holding the seat in said first limit position for a length of time sufficient to ensure that the seat reaches said first limit position.

11. The method as claimed in claim 1, wherein the step of positioning the seat at said second position includes holding the seat in said second limit position for a length of time sufficient to ensure that the seat reaches said second limit position.

2. A method for auto-calibration of a controlled damper suspension system for a body supported on a frame, comprising the steps of:

a) receiving a signal to initiate calibration;

b) positioning the body at a first limit position;

c) determining a first limit value with a position sensor;

d positioning the body at a second limit position;

e) determining a second limit value with the position sensor;

f) storing the first limit value and the second limit value for use by the controlled damper system; and

g) determining a neutral position value between said first limit value and said second limit value and storing said neutral position value for use by the controlled damper system.

3. A method for auto-calibration of a controlled damper suspension system for a body supported on a frame, comprising the steps of:

a) receiving a signal to initiate calibration;

b) positioning the body at a first limit position;

c) determining a first limit value with a position sensor;

d) positioning the body at a second limit position;

e) determining a second limit value with the position sensor;

f) storing the first limit value and the second limit value for use by the controlled damper system; and

g) calculating an end stop based upon at least one position limit value.

4. A method for auto-calibration of a controlled damper suspension system for a body supported on a frame, comprising the steps of:

a) receiving a signal to initiate calibration;

b) positioning the body at a first limit position;

c) determining a first limit value with a position sensor;

d) positioning the body at a second limit position;

e) determining a second limit value with the position sensor;

f) storing the first limit value and the second limit value for use by the controlled damper system; and

g) determining a position range for the body as a difference between said first and said second limit values.

5. The method as claimed in claim 4, further comprising the steps of:

a) calculating a first end stop limit value from said position range;

b) calculating a second end stop limit value from said position range; and

c) storing said first and second end stop limit values for use by the controlled damper system.

6. The method as claimed in claim 5, wherein the step of determining said first end stop limit value comprises determining a position a distance from said first limit position that is a first predetermined fraction of said position range and the step of determining said second end stop limit value comprises determining a position a distance from said second limit position that is a second predetermined fraction of said position range.

7. The method as claimed in claim 5, wherein said first end stop limit value is further distance away from a nearest of said first and second limit position than said second end stop limit value from the other of said first and second limit position.

8. A method for auto-calibration of a controlled damper suspension system for a body supported on a frame, comprising the steps of:

a) receiving a signal to initiate calibration, the step of receiving a signal to initiate calibration including determining whether the signal meets a predetermined criterion;

b) positioning the body at a first limit position;

c) determining a first limit value with a position sensor;

d) positioning the body at a second limit position;

e) determining a second limit value with the position sensor; and

f) storing the first limit value and the second limit value for use by the controlled damper system.

9. The method as claimed in claim 8, wherein said predetermined criterion is a time duration of said signal, and wherein said time duration of said received signal is measured and compared to a predetermined time duration.

12. A method for auto-calibration of a controlled fluid damper suspension system for a vehicle seat, comprising the steps of:

a) receiving a signal to initiate calibration;

b) positioning the seat at an upper limit position;

c) determining an upper limit value with a position sensor;

d) positioning the seat at a lower limit position;

e) determining a lower limit value with the position sensor;

f) determining a position range for the seat as a difference between said upper limit value and said lower limit value;

g) calculating an upper end stop limit value from said position range value;

h) calculating a lower end stop limit value from said position range value;

i) storing said upper limit value, said lower limit value, said upper end stop limit value, and said lower end stop limit value for use by the controlled fluid damper suspension system.

13. The method as claimed in claim 12, further comprising the steps of determining a neutral position value between said upper limit value and said lower limit value, and storing said neutral position value for use by the controlled fluid damper suspension system.

14. The method as claimed in claim 12, further comprising positioning the seat at said neutral position.

15. The method as claimed in claim 12, wherein the step of determining said upper end stop limit value includes determining a position at a distance below said upper limit position that is a first predetermined fraction of said position range.

16. The method as claimed in claim 12, wherein the step of determining said lower end stop limit value includes determining a position at a distance above said lower limit position that is a second predetermined fraction of the position range.

17. The method as claimed in claim 12, wherein said upper end stop limit value is a different distance away from said upper limit position than said lower end stop limit value is from said lower limit position.

18. The method as claimed in claim 12, wherein the step of receiving a signal to initiate calibration includes determining whether a seat leveling switch has been held in an activated position for a predetermined length of time.

19. The method as claimed in claim 12, wherein the step of receiving a signal to initiate calibration includes determining whether the signal has been received within a predetermined time period after the system is powered.

20. A method for auto-calibration of a controlled damper suspension system for a body supported on a frame, comprising the steps of:

a) receiving a signal to initiate calibration;

b) positioning the body at a first limit position;

c) determining a first limit value with a position sensor;

d) positioning the body at a second limit position;

e) determining a second limit value with the position sensor;

f) determining a position range for the body as a difference between said upper limit value and said lower limit value;

g) calculating a first end stop limit value from said position range value;

h) calculating a second end stop limit value from said position range value, wherein said first end stop limit value is a different distance away from a first limit position than said second end stop limit value is from said second limit position;

i) storing said first limit value, said second limit value, said first end stop value, and said second end stop value for use by the controlled damper system.

21. A method for auto-calibration of a controlled damper suspension system for a first body suspended relative to a second body, comprising the steps of:

a) receiving a signal to initiate calibration;

b) positioning the first body at a first limit position;

c) determining a first limit value with a position sensor;

d) positioning the first body at a second limit position;

e) determining a second limit value with the position sensor;

f) storing the first limit value and the second limit value for use by the controlled damper system; and

g) controlling a damper using the first limit value and the second limit value.