Method and apparatus for controlling the inflation pressure of pneumatic wheels

• US 6,218,935 B1
• Filed: 02/25/1999
• Issued: 04/17/2001
• Est. Priority Date: 02/25/1999
• Status: Expired due to Term

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Corcoran, Paul T., Brandt, Everett G.
• Primary Examiner(s): POPE, DARYL C
• Application Number:
  US09/257,562
• Time in Patent Office: 782 Days
• Field of Search: 340/438, 340/441, 340/442, 340/444, 731/462, 73/49
• US Class Current: 340/444
• CPC Class Codes: B60C 23/002 by monitoring conditions other than tyre pressure or deformation
• CPC Class Codes: B60C 23/0408 transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver

Abstract

A method and apparatus for controlling inflation pressure of at least one pneumatic wheel on a machine is disclosed. This includes determining a ground speed or ground acceleration of the machine and determining a rotational velocity or rotational acceleration of a drivetrain for the machine as well as adjusting the inflation pressure in response to a relationship between the ground speed of the machine and the rotational velocity of the drivetrain for the machine or the ground acceleration of the machine and rotational acceleration of the drivetrain for the machine. The temperature of and weight load applied to pneumatic wheel can also be utilized in altering the inflation pressure of the pneumatic wheel. This data may be stored and inflation pressure of at least one pneumatic wheel may be controlled based on this previously stored data.

Claims

1. A method for controlling inflation pressure of at least one pneumatic wheel on a machine having a drivetrain, including the steps of:

determining a ground speed of said machine;

determining a rotational velocity of said drivetrain;

maintaining said inflation pressure in response to a predetermined relationship between said ground speed of said machine and said rotational velocity of said drivetrain; and

changing said inflation pressure in response to a continuous change in said predetermined relationship between said ground speed of said machine and said rotational velocity of said drivetrain.

2. A method, as set forth in claim 1, further including the step of establishing the predetermined relationship to indicate when said ground speed of said machine is less than said rotational velocity of said drivetrain.

3. A method, as set forth in claim 2, wherein said step of changing the inflation pressure in response to a continuous change in the predetermined relationship is further defined as decreasing said inflation pressure when said ground speed of said machine is decreasing with respect to said rotational velocity of said drivetrain.

4. A method, as set forth in claim 2, wherein said step of changing the inflation pressure in response to a continuous change in the predetermined relationship is further defined as increasing said inflation pressure when said ground speed of said machine is increasing with respect to said rotational velocity of said drivetrain.

5. A method, as set forth in claim 1, further comprising a step of measuring temperature of said at least one pneumatic wheel and wherein said step of adjusting said inflation pressure includes varying said inflation pressure at least partially in response to said temperature of said at least one pneumatic wheel.

6. A method, as set forth in claim 1, further comprising a step of measuring weight load on at least one pneumatic wheel and wherein said step of adjusting said inflation pressure includes varying said inflation pressure at least partially in response to said weight load on said at least one pneumatic wheel.

7. A method for controlling inflation pressure of at least one pneumatic wheel on a machine having a drivetrain, including the steps of:

determining a ground acceleration of said machine;

determining a rotational acceleration of said drivetrain;

maintaining said inflation pressure in response to a predetermined relationship between said ground acceleration of said machine and said rotational acceleration of said drivetrain; and

changing said inflation pressure in response to a continuous change in said predetermined relationship between said ground acceleration of said machine and said rotational acceleration of said drivetrain.

8. A method, as set forth in claim 7, further including the step of establishing the predetermined relationship to indicate when said ground acceleration of said machine is less than said rotational acceleration of said drivetrain.

9. A method, as set forth in claim 8, wherein said step of changing the inflation pressure in response to a continuous change in the predetermined relationship is further defined as decreasing said inflation pressure when said ground acceleration of said machine is decreasing with respect to said rotational acceleration of said drivetrain.

10. A method, as set forth in claim 8, wherein said step of changing the inflation pressure in response to a continuous change in the predetermined relationship is further defined as increasing said inflation pressure when said ground acceleration of said machine is increasing with respect to said rotational acceleration of said drivetrain.

11. A method, as set forth in claim 7, further comprising a step of measuring temperature of said at least one pneumatic wheel and wherein said step of adjusting said inflation pressure includes varying said inflation pressure at least partially in response to said temperature of said at least one pneumatic wheel.

12. A method, as set forth in claim 7, further comprising a step of measuring weight load on at least one pneumatic wheel and wherein said step of adjusting said inflation pressure includes varying said inflation pressure at least partially in response to said weight load on said at least one pneumatic wheel.

13. An apparatus for controlling inflation pressure of at least one pneumatic wheel on a machine having a drivetrain, comprising:

a mechanism for determining a ground speed of said machine;

a mechanism for determining a rotational velocity of said drivetrain;

a control system for establishing a predetermined relationship between said ground speed of said machine and said rotational velocity of said drivetrain and for maintaining said inflation pressure in response to said predetermined relationship; and

an inflation pressure system adapted to change said inflation pressure of said at least one pneumatic wheel in response to a continuous change in said predetermined relationship between said ground speed of said machine and said rotational velocity of said drivetrain.

14. An apparatus, as set forth in claim 13, wherein said control system establishes said predetermined relationship to indicate when said ground speed of said machine is less than said rotational velocity of said drivetrain.

15. An apparatus, as set forth in claim 14, wherein said control system decreases said inflation pressure when said ground speed of said machine is decreasing with respect to said rotational velocity of said drivetrain.

16. An apparatus, as set forth in claim 14, wherein said control system increases said inflation pressure when said ground speed of said machine is increasing with respect to said rotational velocity of said drivetrain.

17. An apparatus, as set forth in claim 13, further comprising a mechanism for measuring temperature of said at least one pneumatic wheel and wherein said control system adjusts said inflation pressure at least partially in response to said measured temperature of said at least one pneumatic wheel.

18. An apparatus, as set forth in claim 13, further comprising a mechanism for measuring weight load of said at least one pneumatic wheel and wherein said control system adjusts said inflation pressure at least partially in response to said measured weight load of said at least one pneumatic wheel.

19. An apparatus for controlling inflation pressure of at least one pneumatic wheel on a machine having a drivetrain, comprising:

a mechanism for determining a ground acceleration of said machine;

a mechanism for determining a rotational acceleration of said drivetrain;

a control system for establishing a predetermined relationship between said ground acceleration of said machine and said rotational acceleration of said drivetrain and for maintaining said inflation pressure in response to said predetermined relationship; and

an inflation pressure system adapted to change said inflation pressure of said at least one pneumatic wheel in response to a continuous change in said predetermined relationship between said ground acceleration of said machine and said rotational acceleration of said drivetrain.

20. An apparatus, as set forth in claim 19, wherein said control system establishes said predetermined relationship to indicate when said ground acceleration of said machine is less than rotational acceleration of said drivetrain.

21. An apparatus, as set forth in claim 20, wherein said control system decreases said inflation pressure when said ground acceleration of said machine is decreasing with respect to said rotational acceleration of said drivetrain.

22. An apparatus, as set forth in claim 20, wherein said control system increases said inflation pressure when said ground acceleration of said machine is increasing with respect to said rotational acceleration of said drivetrain.

23. An apparatus, as set forth in claim 19, further comprising a mechanism for measuring temperature of said at least one pneumatic wheel and wherein said control system adjusts said inflation pressure at least partially in response to said measured temperature of said at least one pneumatic wheel.

24. An apparatus, as set forth in claim 19, further comprising a mechanism for measuring weight load of said at least one pneumatic wheel and wherein said control system adjusts said inflation pressure at least partially in response to said measured weight load of said at least one pneumatic wheel.

25. A method for controlling inflation pressure of at least one pneumatic wheel on a machine having a drivetrain, including the steps of:

determining a ground speed of said machine;

determining a rotational velocity of said drivetrain;

determining a physical position of said machine;

storing a difference between said ground speed of said machine and said rotational velocity of said drivetrain in correlation to said physical position of said machine;

maintaining said inflation pressure in response to a predetermined relationship of said difference between said ground speed of said machine and said rotational velocity of said drivetrain for said corresponding physical position of said machine; and

changing said inflation pressure in response to a continuous change in said predetermined relationship of said difference between said ground speed of said machine and said rotational velocity of said drivetrain for said corresponding physical position of said machine.

26. A method for controlling inflation pressure of at least one pneumatic wheel on a machine having a drivetrain, including the steps of:

determining a ground acceleration of said machine;

determining a rotational acceleration of said drivetrain;

determining a physical position of said machine;

storing a difference between said ground acceleration of said machine and said rotational acceleration of said drivetrain in correlation to said physical position of said machine;

maintaining said inflation pressure in response to a predetermined relationship of said difference between said ground acceleration of said machine and said rotational acceleration of said drivetrain for said corresponding physical position of said machine; and

changing said inflation pressure in response to a continuous change in said predetermined relationship of said difference between said ground acceleration of said machine and said rotational acceleration of said drivetrain for said corresponding physical position of said machine.

27. An apparatus for controlling inflation pressure of at least one pneumatic wheel on a machine having a drivetrain, comprising:

a mechanism for determining a ground speed of said machine;

a mechanism for determining a rotational velocity of said drivetrain;

a mechanism for determining a physical position of said machine;

a control system for storing a difference between said ground speed of said machine and said rotational velocity of said drivetrain in correlation to said physical position of said machine, for establishing a predetermined relationship of said difference between said ground speed of said machine and said rotational velocity of said drivetrain, and for maintaining said inflation pressure in response to said predetermined relationship of said difference between said ground speed of said machine and said rotational velocity of said drivetrain for said corresponding physical position of said machine; and

an inflation pressure system adapted to change said inflation pressure of said at least one pneumatic wheel in response to a continuous change in said predetermined relationship of said difference between said ground speed of said machine and said rotational velocity of said drivetrain for said corresponding physical position of said machine.

28. An apparatus for controlling inflation pressure of at least one pneumatic wheel on a machine having a drivetrain, comprising:

a mechanism for determining a ground acceleration of said machine;

a mechanism for determining a rotational acceleration of said drivetrain;

a mechanism for determining a physical position of said machine;

a control system for storing a difference between said ground acceleration of said machine and said rotational acceleration of said drivetrain in correlation to said physical position of said machine, for establishing a predetermined relationship of said difference between said ground acceleration of said machine and said rotational acceleration of said drivetrain, and for maintaining said inflation pressure in response to said predetermined relationship of said difference between said ground acceleration of said machine and said rotational acceleration of said drivetrain for said corresponding physical position of said machine; and

an inflation pressure system adapted to change said inflation pressure of said at least one pneumatic wheel in response to a continuous change in said predetermined relationship of said difference between said around acceleration of said machine and said rotational acceleration of said drivetrain for said corresponding physical position of said machine.