Smart time tire monitoring system

• US 20060220805A1
• Filed: 03/18/2005
• Published: 10/05/2006
• Est. Priority Date: 03/18/2005
• Status: Active Grant

• Current Assignee: Infineon Technologies AG
• Original Assignee: Infineon Technologies AG
• Inventors: Thomas, Michael A., LeFort, Robert D., Wunderlich, Chris A., McGowan, John T.
• Granted Patent: US 7,385,485 B2
• Time in Patent Office: Days
• US Class Current: 340/426.330
• CPC Class Codes: B60C 23/0416 allocating a corresponding wheel position on vehicle, e.g. front/left or rear/right
• CPC Class Codes: B60C 23/0442 the transmitted signal comprises further information, e.g. instruction codes, sensor characteristics or identification data
• CPC Class Codes: B60C 23/0445 Means for changing operating mode, e.g. sleep mode, factory mode or energy saving mode
• CPC Class Codes: B60C 23/0454 Means for changing operation mode, e.g. sleep mode, factory mode or energy save mode
• CPC Class Codes: B60C 23/0464 to avoid signal interference

Abstract

A tire monitoring system and associated method is disclosed. The tire monitoring system includes a plurality of tire sensor modules configured to transmit tire data in a wireless fashion at a predetermined time interval. The system also includes a vehicle control module that is configured to receive the tire data from the tire sensor modules, and is further configured to dictate the predetermined time interval at which the tire data is transmitted by the tire sensor modules.

Claims

1. A tire monitoring system, comprising:

a tire sensor module configured to transmit tire data in a wireless fashion at a predetermined time interval; and

a vehicle control module configured to receive the tire data from the tire sensor module, and further configured to dictate the predetermined time interval at which the tire data is transmitted by the tire sensor module.

2. The tire monitoring system of claim 1, wherein the tire sensor module comprises:

a battery;

a tire parameter sensor coupled to the battery;

a tire sensor controller coupled to the battery and the tire parameter sensor;

a transceiver coupled to the battery and the tire sensor controller; and

a clock circuit coupled to the battery and the tire sensor controller,

wherein in a low power mode, the tire parameter sensor, the tire sensor controller, and the transceiver are switched off, thereby reducing a current draw on the battery, and wherein during the low power mode the clock circuit is powered on and operable to determine when the predetermined time interval is to be initiated.

3. The tire monitoring system of claim 2, wherein the predetermined time interval comprises a wake-up mode, and wherein the clock circuit activates, directly or indirectly, the tire parameter sensor, the tire sensor controller and the transceiver during the wake-up mode, and wherein the transceiver transmits tire data acquired by the tire parameter sensor during the wake-up mode.

4. The tire monitoring system of claim 3, wherein the vehicle control module is configured to alter the predetermined time interval, and communicate the altered predetermined time interval to the tire sensor module upon receipt of the tire data therefrom.

5. The tire monitoring system of claim 4, wherein the vehicle control module is further configured to alter the predetermined time interval based on a speed of a vehicle in which the tire monitoring system resides.

6. The tire monitoring system of claim 1, further comprising five tire sensor modules, wherein one of the tire sensor modules is associated with a spare tire, and each of the remaining four tire sensor modules are associated with one of the vehicles tires of a vehicle in which the tire monitoring system resides, namely a right front tire, a left front tire, a right rear tire and a left rear tire, respectively, and wherein the vehicle control module is located physically closer to one of the vehicle tires than the others, and wherein the vehicle control module is further configured to identify a location of at least two of the tire sensor modules associated respectively with two of the vehicle tires based on a signal transmission strength therefrom.

7. The tire monitoring system of claim 6, wherein each of the tire sensor modules are configured to transmit an amplitude modulated signal, and wherein the vehicle control module is further configured to identify the location of the tire sensor modules associated with the spare tire and the remaining two tires based on the amplitude modulated signals when the vehicle is moving in a turn pattern.

8. A multi-mode tire monitoring system associated with a vehicle, comprising:

a plurality of tire sensor modules, each tire sensor module comprising;

a battery;

a tire parameter sensor coupled to the battery;

a tire sensor controller coupled to the battery and having a clock circuit associated therewith;

a transceiver coupled to the battery; and

a vehicle control module operably associated with the plurality of tire sensor modules,

wherein in a factory mode of operation each of the tire sensor modules are in a low current mode of operation, and wherein each of the tire sensor modules are further configured to exit the low current mode of operation based on a wake-up command transmitted thereto from the vehicle control module.

9. The multi-mode tire monitoring system of claim 8, wherein each of the tire sensor modules are associated with one of the tires of the vehicle and are configured to enter a learn mode of operation upon receipt of the wake-up command, wherein in the learn mode each of the tire sensor modes send periodic FSK modulated transmissions, wherein the vehicle control module employs an analog to digital converter (ADC) to monitor the RSSI signal to identify an identity and location of the tire sensor modules on the vehicle base upon signal strength.

10. The multi-mode tire monitoring system of claim 9, wherein the vehicle control module is located physically closer to one of the tire sensor modules than the others, and wherein the vehicle control module is configured to ascertain the location of at least two of the tire sensor modules based on a signal strength of the periodic FSK modulated transmissions.

11. The multi-mode tire monitoring system of claim 10, wherein the vehicle control module is further configured to ascertain the location of the remaining tire sensor modules based on a RSSI signal change due to path loss as the vehicle is moving in a turn pattern.

12. The multi-mode tire monitoring system of claim 9, wherein the vehicle control module is further configured to exit the learn mode and enter a program mode of operation upon identifying the identity and location of each of the tire sensor modules, and wherein in the program mode the vehicle control module transmits to each tire sensor module a unique predetermined time interval for transmission of tire data from the respective tire sensor module to the vehicle control module, wherein each of the predetermined time intervals do not overlap one another in time, thereby eliminating data collisions with respect to the tire data.

13. The multi-mode tire monitoring system of claim 12, wherein the vehicle control module comprises a master clock, and wherein during the program mode the clock circuit of each tire sensor module is synchronized to the master clock.

14. The multi-mode tire monitoring system of claim 12, wherein after the program mode each of the tire sensor modules enter a low power mode, wherein the tire parameter sensor and the transceiver are switched, thereby not drawing battery current, and wherein the clock circuit is activated and keeps track of the unique predetermined time interval associated therewith.

15. The multi-mode tire monitoring system of claim 14, wherein, upon each of the tire sensor modules reaching the unique predetermined time interval, the tire sensor modules exit the low power mode and enter a send mode, wherein each tire sensor module acquires and transmits the tire data to the vehicle control module.

16. The multi-mode tire monitoring system of claim 15, wherein during the send mode or each tire sensor module, the vehicle control module transmits an updated unique predetermined time interval to the respective tire sensor module.

17. The multi-mode tire monitoring system of claim 16, wherein the updated unique predetermined time interval differs from the pervious predetermined time interval and is a function of a speed of the vehicle.

18. A tire monitoring system, comprising:

a means for acquiring tire data and transmitting the tire data in a wireless fashion associated with each tire of a vehicle; and

means for receiving the transmitted tire data and dictating a unique predetermined time interval in which tire data associated with each tire is transmitted by the tire data acquisition and transmission means, wherein the predetermined time intervals do not overlap in time with one another.

19. The tire monitoring system of claim 18, wherein the means for acquiring and transmitting tire data further comprises clock means operable to keep track of the predetermined time interval, and wherein in time periods not associated with the predetermined time interval the means for acquiring and transmitting tire data is in a low power mode.

20. The tire monitoring system of claim 18, further comprising means for determining an identity and location of each means for acquiring and transmitting tire data by evaluating a signal strength of a signal transmitted by the means for acquiring and transmitting tire data.

21. The tire monitoring system of claim 20, wherein the means for determining an identity and location is further operable to evaluate a change in the RSSI signal by measuring the AM modulation of the RSSI signal when the vehicle is moving in a turn pattern.

22. A method of transmitting tire data from a plurality of tire sensor modules to a vehicle control module, comprising:

assigning a predetermined time interval for transmission of the tire data to each of the tire sensor modules, wherein each of the predetermined time intervals do not overlap with one another in time; and

transmitting tire data from each tire sensor module to the vehicle control module during the respective predetermined time interval, thereby avoiding data collisions associated with the tire data at the vehicle control module.

23. The method of claim 22, further comprising:

maintaining each tire sensor module in a low power mode of operation at time periods not associated with the respective predetermined time intervals; and

activating tire parameter acquisition components and tire data transmission components of each tire sensor module during the respective predetermined time interval.

24. The method of claim 22, further comprising monitoring the respective predetermined time interval in each tire sensor module via a clock circuit.

25. The method of claim 22, further comprising:

identifying an identity and location of each tire sensor module, wherein each tire sensor module is associated with a tire of a vehicle; and

assigning the predetermined time interval in accordance with the identity and location of each tire sensor.

26. The method of claim 25, wherein identifying an identity and location of each tire sensor comprises:

positioning the vehicle control module physically closer to one of the tire sensor modules than the other tire sensor modules; and

identifying the location of at least two of the tire sensor modules by sensing at the vehicle control module a transmission signal strength of transmissions from the tire sensor modules.

27. The method of claim 26, further comprising identifying the location of the remaining tire sensor modules by evaluating a change in AM modulation of transmissions from the remaining tire sensor modules when the vehicle is moving in a turn pattern.

28. The method of claim 22, further comprising:

ascertaining a speed of the vehicle at one of the predetermined time intervals; and

assigning an updated predetermined time interval based on the vehicle speed.

29. A method of configuring a tire data acquisition system, comprising:

maintaining each of a plurality of tire sensor modules in a low power condition in a factory mode of operation; and

activating the plurality of tire sensor modules in a learn mode of operation by transmission of a wake-up command from a vehicle control module.

30. The method of claim 29, wherein during the learn mode of operation each of the tire sensor modules send periodic amplitude modulated transmissions to the vehicle control module.

31. The method of claim 30, further comprising:

locating the vehicle control module closer to one of the tire sensors than the others; and

identifying a location of at least two of the tire sensor modules based on an evaluation of a transmission strength of the periodic amplitude modulated transmissions received at the vehicle control module.

32. The method of claim 31, further comprising identifying the location of the remaining unidentified ire sensor modules based on an evaluation in a change in the periodic modulated transmissions received at the vehicle control module when the vehicle is moving in a turn pattern.

33. The method of claim 29, further comprising:

identifying a location of each of the tire sensor modules; and

assigning a predetermined time interval to each of the tire sensor modules during which tire data is transmitted from the respective tire sensor module to the vehicle control module, wherein the predetermined time intervals do not overlap one another in time.

34. The method of claim 33, further comprising maintaining a low power mode of operation in each of the tire sensor modules, wherein a respective clock circuit associated with each tire sensor module is activated to identify the respective predetermined time interval.

35. The method of claim 34, further comprising:

exiting the low power mode and entering a send mode when the clock circuit of each respective tire sensor module identifies the respective predetermined time interval; and

transmitting tire data from the respective tire sensor module to the vehicle control module during the predetermined time interval.

36. The method of claim 35, further comprising:

determining an updated predetermined time interval based upon one or more vehicle characteristics; and

sending the updated predetermined time interval to the respective tire sensor module after receipt of the tire data therefrom.

37. A method of collecting tire data at a vehicle control module from a plurality of tire sensor modules associated with tires of a vehicle, comprising:

identifying a tire location of each of the tire sensor modules;

assigning a unique predetermined time interval to each of the identified tire sensor modules, wherein the respective predetermined time intervals do not overlap in time; and

transmitting tire data from a respective tire sensor module to the vehicle control module during each respective predetermined time interval, thereby avoiding tire data collisions at the vehicle control module.

38. The method of claim 37, further comprising:

generating updated unique predetermined time intervals based on one ore more vehicle characteristics; and

assigning the updated predetermined time intervals to each of the tire sensor modules in conjunction with receiving the transmitted tire data at the vehicle control module.

39. The method of claim 38, wherein a vehicle characteristic comprises a vehicle speed, and wherein when the vehicle speed increases a frequency of the predetermined time intervals is increased.

40. The method of claim 37, wherein identifying the location of the tire sensor modules comprises:

locating the vehicle control module closer to one of the tire sensor modules than the others;

transmitting a signal from each of the tire sensor modules; and

identifying the location of at least two of the tire sensor modules by evaluating a transmission strength of the transmitted signal received at the vehicle control module.

41. The method of claim 40, wherein transmitting the signal from each of the tire sensor modules comprises transmitting a periodic FSK modulated signal, and further comprising identifying the location of the remaining unidentified tire sensor modules by evaluating a change in the AM modulation of the signals when the vehicle is moving in a turn pattern.