Wheel-monitoring module

• US 10,035,387 B2
• Filed: 11/30/2007
• Issued: 07/31/2018
• Est. Priority Date: 11/30/2007
• Status: Active Grant

• Current Assignee: Volvo Technology Corporation
• Original Assignee: Volvo Lastvagnar AB (Volvo AB)
• Inventors: Carresjo, Erik, Hasselberg, Per, Trygg, Anders
• Primary Examiner(s): NGHIEM, MICHAEL P
• Application Number:
  US12/742,399
• Publication Number:
  US 20100256946A1
• Time in Patent Office: 3,896 Days
• Field of Search: 702 98, 702140
• CPC Class Codes: B60C 23/0462 Structure of transmission protocol
• CPC Class Codes: B60C 23/0474 Measurement control, e.g. setting measurement rate or calibrating of sensors; Further processing of measured values, e.g. filtering, compensating or slope monitoring
• CPC Class Codes: G01L 17/00 Devices or apparatus for measuring tyre pressure or the pressure in other inflated bodies
• CPC Class Codes: G01L 27/00 Testing or calibrating of apparatus for measuring fluid pressure
• CPC Class Codes: G07C 5/085 using electronic data carriers

Abstract

A module is operable to monitor at least a pressure within a tire of a wheel, the module being operatively mounted to said wheel, the module including (a) a pressure sensor for measuring the pressure (P) and generating a corresponding pressure signal; and b1) an associated data memory including a data field containing data relevant to the functional status of the tire.

Claims

1. A module operable to monitor at least a pressure within a tire of a wheel of a vehicle, the module being operatively mounted to the wheel, the module including:

(a) a pressure sensor for measuring the pressure and generating a corresponding pressure signal;

b) an associated data memory including a data field containing data relevant to a functional status of the tire; and

(c) a data processor arranged to detect that the pressure measured by the pressure sensor has fallen below a predetermined threshold value and, upon detecting that the pressure measured by the pressure sensor has fallen below the predetermined threshold value, arranged to communicate a message that the data relevant to the functional status of the tire is unreliable for use in ascertaining the functional status of the tire and as a result to adapt functions of the data processor to default values assuming an inferior tire quality, the data processor being further arranged to detect that the pressure measured by the pressure sensor is above the predetermined threshold value and, upon detecting that the pressure measured by the pressure sensor is above the predetermined threshold value, arranged to communicate a message that the data relevant to the functional status of the tire is reliable for use in ascertaining the functional status of the tire and as a result to adapt application of subsystems of the vehicle to the data stored in the associated memory to control movement of the vehicle,

wherein the data field containing data relevant to the functional status of the tire includes one or more of the following data;

a) tire slip curves,

b) tire size,

c) tire age, and

d) a record of the distance the tire has been used.

2. The module according to claim 1, wherein the data processor is prevented from changing the data relevant to the functional status of the tire from “

unreliable”

to “

reliable”

unless a key code signal is received.

3. The module according to claim 1, wherein the data processor is arranged to change the data relevant to the functional status of the tire from “

unreliable”

to “

reliable”

when a key code signal is received externally from the module.

4. The module according to claim 1, wherein the data processor is arranged to monitor the pressure measured by the pressure sensor and to communicate a message that the data relevant to the functional status of the tire is “

reliable”

as long as the pressure is maintained above a predetermined threshold value, and to communicate a message that the data relevant to the functional status of the tire is “

unreliable”

as soon as the pressure measured by the pressure sensor falls below the predetermined threshold value.

5. The module according to claim 1, wherein the data processor is coupled in communication with the associated data memory and arranged to receive the pressure signal.

6. The module according to claim 1, wherein the pressure sensor is mounted on a rim of the wheel.

7. The module according to claim 1, wherein the module further comprising

(c) a wireless interface coupled in communication with the processor for enabling the processor to communicate externally to the module;

(d) a source of power for providing operating power for the module;

wherein the data processor is operable to a generate a record of the pressure as a function of time in the data memory for monitoring the wheel and the tire and to communicate information derived from the record via the wireless interface for enabling a condition of the wheel to be monitored externally to the module.

8. The module as claimed in claim 1, wherein the module is arranged to detect depressurization events experienced by the wheel or an exchange of the tire.

9. The module as claimed in claim 1, wherein the module is mountable at one or more locations on the wheel, the one or more locations including:

(a) on a hub of the wheel substantially at an axis of rotation of the wheel;

(b) on a hub of the wheel at a radial distance from the axis of rotation of the wheel;

(c) on a hub of the wheel in fluid communication with a filling valve of a tire of the wheel for sensing a pressure within the tire;

(d) within a tire of the wheel for sensing a pressure within the tire, the module being mounted to a peripheral surface of a hub of the wheel;

(e) within a tire of the wheel for sensing a pressure within the tire, the module being mounted to an inside side-wall surface of the tire for measuring flexural characteristics of the side-wall; and

(f) on an inside surface of a peripheral rim of the wheel for measuring acceleration thereat.

10. The module as claimed in claim 1, wherein the module includes a temperature sensor for sensing a temperature thereat, the temperature sensor being operable to generate a temperature signal representative of the temperature for receipt at the data processor for at least one of recording in the data memory and communicating via a wireless interface externally to the module.

11. The module as claimed in claim 1, wherein the module includes at least one of:

(a) a strain gauge sensor for measuring flexure of the tire of the wheel, the strain gauge sensor being arranged to generate a signal indicative of the flexure for receipt at the data processor for at least one of recording in the data memory and communicating via a wireless interface externally to the module;

(b) an accelerometer for measuring acceleration in at least one axis at a mounting location of the module on the wheel, the accelerometer being arranged to generate a signal indicative of the acceleration for receipt at the data processor for at least one of recording in the data memory and communicating via the wireless interface externally to the module; and

(c) a magnetic sensor for measuring a magnetic field applied to the module, the module being arranged to generate a signal indicative of the applied magnetic field to the data processor for at least one of recording in the data memory and communicating via the wireless interface externally to the module.

12. The module as claimed in claim 1, wherein the module is provided with a corresponding identification code for communicating to a processing arrangement external to the module, so that a processing arrangement operatively in communication with the module is able to recognize the module when corresponding signal data has been sent therefrom and attribute the signal data to the module.

13. The module as claimed in claim 1, wherein the data processor is coupled to the data memory, and the module via the pressure sensor is arranged to record the pressure within the tire of the wheel in relation to time as determined by a clock arrangement included within the module, and the processor is arranged to monitor changes in the pressure with time to identify one or more of:

(a) a gradual leak of air or gas from the tire indicative of a need to recharge the tire with air or gas; and

(b) any abrupt depressurization of the tire indicative of a puncturing event or a rapid deflation event having occurred, or the tire having been exchanged.

14. The module as claimed in claim 13, wherein the module is arranged to sense data pertaining to the tire of the wheel that the tire is potentially unreliable on account of the abrupt depressurization and to communicate a message therefrom regarding the sensed data.

15. The module as claimed in claim 1, wherein the module is arranged to also respond with data indicative of expected characteristics of the wheel to which the module is mounted in operation.

16. The module as claimed in claim 1, wherein the module is arranged to monitor a tampering event applied to the wheel.

17. A method of validation of data relevant to a functional status of a tire stored in a memory of a module mounted in a wheel of a vehicle for tire maintenance, comprising:

a) monitoring a pressure in the tire measured by a pressure sensor;

b) maintaining the data relevant to the functional status of the tire as reliable as long as the pressure is maintained above a predetermined threshold value;

c) determining that the pressure measured by the pressure sensor has fallen below the predetermined threshold valve; and

d) setting the data relevant to the functional status of the tire as unreliable for use in ascertaining the functional status of the tire upon determining that the pressure measured by the pressure sensor has fallen below the predetermined threshold value; and

wherein a data processor is configured to set the data relevant to the functional status of the tire as unreliable as soon as the pressure measured by the pressure sensor falls below the predetermined threshold value, and the data processor of the module is arranged to communicate a message that the data relevant to the functional status of the tire is unreliable for use in ascertaining the functional status of the tire as soon as the pressure measured by the pressure sensor falls below the predetermined threshold value and as a result to adapt functions of the data processor to default values assuming an inferior tire quality, wherein the data field containing data relevant to the functional status of the tire includes one or more of the following data;

a) tire slip curves,

b) tire size,

c) tire age, and

d) a record of the distance the tire has been used,

the data processor being further configured to detect that the pressure measured by the pressure sensor is above the predetermined threshold value and, upon detecting that the pressure measured by the pressure sensor is above the predetermined threshold value, arranged to communicate a message that the data relevant to the functional status of the tire is reliable for use in ascertaining the functional status of the tire and as a result to perform a step of adapting application of one or more subsystems of the vehicle to the data stored in the memory to control movement of the vehicle.

18. The method according to claim 17, comprising preventing the data processor from changing the data relevant to the functional status of the tire from “

unreliable”

to “

reliable”

unless a key code signal is received externally from the module.

19. The method according to claim 17, comprising changing, via the data processor, the data relevant to the functional status of the tire from “

unreliable”

to “

reliable”

upon reception of a key code signal externally from the module.

20. The method according to claim 17, wherein the data field containing data relevant to the functional status of the tire furthermore includes one or more of data a)-d) and:

e) a field containing a record of samples of the temperature measured by a temperature sensor mounted on the wheel for monitoring the temperature of the tire,

and the data processor is arranged to continuously or periodically update the data field.

21. The method according to claim 17, wherein the following method steps are performed:

(a) measuring the pressure using the pressure sensor of the module for generating a corresponding pressure signal;

(b) receiving the pressure signal at a data processor of the module, the data processor being coupled in communication with an associated data memory;

(c) generating a record of the pressure as a function of time in the data memory for monitoring the wheel and the tire; and

(d) communicating information derived from the record via a wireless interface of the module for enable a condition of the wheel to be monitored externally to the module.

22. The method according to claim 21, including a further step of detecting depressurization events experienced by the wheel and an exchange of the tire including exchange of corresponding information in the record.

23. The method according to claim 21, wherein the data processor is coupled to the data memory, and the module via the pressure sensor of the module is arranged to record the pressure within the tire of the wheel in relation to time as determined by a clock arrangement included within the module, and the processor is arranged to monitor changes in the pressure with time to identify one or more of:

(a) a gradual leak of air or gas from the tire indicative of a need to recharge the tire with air or gas; and

(b) any abrupt depressurization of the tire indicative of a puncturing event or a rapid deflation event having occurred, or the tire having been exchanged.

24. The method as claimed in claim 23, including sensing via the module that the tire of the wheel is potentially unreliable on account of the abrupt depressurization and communicating a message from the module regarding the sensed data.

25. The method according to claim 17, including a step of mounting the module at one or more locations on the wheel, the one or more locations including:

(a) on a hub of the wheel substantially at an axis of rotation of the wheel;

(b) on the hub of the wheel at a radial distance from the axis of rotation of the wheel;

(c) on the hub of the wheel in fluid communication with a filling valve of a tire of the wheel for sensing a pressure within the tire;

(d) within a tire of the wheel for sensing a pressure within the tire, the module being mounted to a peripheral surface of a hub of the wheel;

(e) within a tire of the wheel for sensing a pressure within the tire, the module being mounted to an inside side-wall surface of the tire for measuring flexural characteristics of the side-wall; and

(f) on an inside surface of a peripheral rim of the wheel for measuring acceleration thereat.

26. The method according to claim 17, wherein the module includes a temperature sensor for sensing a temperature thereat, the temperature sensor being arranged to generate a temperature signal representative of the temperature for receipt at the data processor for at least one of recording in the data memory and communicating via a wireless interface externally to tire module.

27. The method as claimed in claim 26, including a step of monitoring using the module a tampering event applied to the wheel.

28. The method as claimed in claim 17, wherein the module includes at least one of:

(a) a strain gauge sensor for measuring flexure of the fire of the wheel, the strain gauge sensor being arranged to generate a signal indicative of the flexure for receipt at the data processor for at least one of recording in the data memory and communicating via a wireless interface externally to the module;

(b) an accelerometer for measuring acceleration in at least one axis at a mounting location of the module on the wheel, the accelerometer being arranged to generate a signal indicative of the acceleration for receipt at the data processor for at least one of recording in the data memory and communicating via the wireless interface externally to the module; and

(c) a magnetic sensor for measuring a magnetic field applied to the module, the module being arranged to generate a signal indicative of the applied magnetic field to the data processor for at least one of recording in the data memory and communicating via the wireless interface externally to the module.

29. The method as claimed in claim 17, wherein the module is provided with a corresponding identification code for communicating to a processing arrangement external to the module, so that the processing arrangement is able to recognize the module when corresponding signal data has been sent therefrom and attribute the signal data to the module.

30. A method of detecting misuse of tires of a vehicle for tire maintenance, comprising:

operating a data processor to continuously or periodically update data stored in a data field containing data relevant to a functional status of the tire, wherein the data field includes at least one of;

a) tire slip curves,

b) tire size,

c) tire age,

d) a record of the distance the tire has been used,

e) a field containing record of samples of pressure measured by the pressure sensor,

f) a field containing record of samples of the temperature measured by a temperature sensor mounted on the wheel for monitoring the temperature of the tire;

validating data in the data fields by validation of data relevant to the functional status of the tire stored in a module mounted in a wheel, the validation comprising monitoring, a pressure measured by a pressure sensor,

maintaining the data relevant to the functional status of the tire as reliable as long as the pressure is maintained above a predetermined threshold value,

when the pressure measured by the pressure sensor has fallen below the predetermined threshold value is determined, setting the data relevant to the functional status of the tire as unreliable upon determining that the pressure measured by the pressure sensor has fallen below the predetermined threshold value and as a result adapting functions of the data processor to default values assuming an inferior tire quality, and

when the pressure measured by the pressure sensor is above the predetermined threshold value is determined, communicating a message that the data relevant to the functional status of the tire is reliable for use in ascertaining the functional status of the tire and as a result adapting application of subsystems of the vehicle to the data stored in the associated memory to control movement of the vehicle, wherein the data processor is arranged to communicate a message that the data relevant to the functional status of the tire is unreliable for use in ascertaining the functional status of the tire as soon as the pressure measured by the pressure sensor falls below the predetermined threshold value;

determining that the validated data shows that the field containing record of samples of pressure measured by the pressure sensor contains data outside a set range or if the field containing record of samples of the temperature measured by a temperature sensor contains data above a threshold value;

determining that a misuse of the tire has been present when the validated data shows that the field containing record of samples of pressure measured by the pressure sensor contains data outside the set range or if the field containing record of samples of the temperature measured by a temperature sensor contains data above the threshold value; and

adapting a function of an on board system of the vehicle to the default values assuming the inferior tire quality.