Method and system for monitoring a parameter of a vehicle tire

• US 5,741,966 A
• Filed: 06/06/1995
• Issued: 04/21/1998
• Est. Priority Date: 08/03/1993
• Status: Expired due to Term

• Current Assignee: BMW of North America LLC (Bayerische Motoren Werke AG), Ford Motor Company, American Honda Motor Co., Inc. (Honda Motor Company), Hyundai Motor America (Hyundai Motor Group), MHL Tek LLC, Mitsubishi Motors North America Incorporated (Mitsubishi Materials Corporation), General Motors Corporation (Motors Liquidation Co. GUC Trust), Nissan North America Incorporated (Nissan Motor Co., Ltd.), Fuji Heavy Industries Limited (Subaru Corp.), Jaguar Land Rover North America LLC (TATA Motors Limited), Dr Ing hc F Porsche AG (Volkswagen AG)
• Original Assignee: McLaughlin Electronics Incorporated
• Inventors: Handfield, Michael, Laliberte, Helene
• Primary Examiner(s): Dombroske, George M.
• Assistant Examiner(s): MCCALL, ERIC SCOTT
• Application Number:
  US08/465,763
• Time in Patent Office: 1,050 Days
• Field of Search: 73/146.2, 73/146.3, 73/146.5, 73/146.8, 340/443, 340/444, 340/445, 340/446, 340/447, 340/448
• US Class Current: 73/146.5
• CPC Class Codes: B60C 23/0401 characterised by the type of alarm
• CPC Class Codes: B60C 23/0411 Piezoelectric generators
• CPC Class Codes: B60C 23/0422 characterised by the type of signal transmission means
• CPC Class Codes: B60C 23/0452 Antenna structure, control or arrangement vehicle tyre mounted antennas H01Q1/2241
• CPC Class Codes: B60C 23/0455 Transmission control of wireless signals
• CPC Class Codes: B60C 23/0471 System initialisation, e.g. upload or calibration of operating parameters
• CPC Class Codes: B60C 23/0483 Wireless routers between wheel mounted transmitters and chassis mounted receivers
• CPC Class Codes: B60C 23/0498 for rim attachments B60C23/0494, B60C23/0496 take precedence
• CPC Class Codes: B60R 25/1001 Alarm systems associated with another car fitting or mechanism, e.g. door lock or knob, pedals features related to the general power supply B60R25/1018

Abstract

The present invention relates to a method and system for monitoring a parameter of a vehicle tire. In one embodiment, a detector unit disposed within the tire communicates with a central receiver unit over an electromagnetic path comprising one or more conductive components of the vehicle. Other embodiments of the invention include additional communications links for receiving information from and controlling the detector unit and the receiver.

Claims

1. A system for monitoring a status of a parameter of a tire for a vehicle, the system comprising:

a sensor, disposed within the tire, for generating a signal indicative of the parameter of the tire independently of magnitude of the parameter;

a programmable processor, in electrical communication with the sensor for determining status of the tire parameter by comparing the tire parameter to a selected threshold;

a transmitter, in electrical communication with the processor for transmitting a status signal indicative of the status of the tire parameter along a first communications link;

a monitor, in communication with the first communications link, for monitoring the status of the tire parameter;

a communication unit in electrical communication with the processor having a first receiver for receiving a processor control command; and

a remote controller, positionable for communication with the communication unit via a second communications link, for initiating the processor control command.

2. The system of claim 1 wherein the communication unit further includes a second transmitter for sending a transmission in response to the processor control command.

3. The system of claim 2 wherein the remote controller further comprises a second receiver for receiving the transmission sent by the second transmitter.

4. The system of claim 1 wherein the processor control command includes a command to change the selected threshold.

5. The system of claim 3 wherein the processor control command includes a command to transmit a controller parameter.

6. The system of claim 5 wherein the controller parameter includes a tire identification code.

7. The system of claim 5 wherein the controller parameter includes a controller identification.

8. The system of claim 3 wherein the processor control command includes a command to test the sensor and to transmit a test result.

9. The system of claim 1 wherein the second communications link comprises an inductively coupled channel.

10. The system of claim 1 wherein the tire parameter is inflation pressure within the tire.

11. The system of claim 1 wherein the tire parameter is temperature within the tire.

12. A system for monitoring a parameter of a tire for a vehicle, the system comprising:

a sensor, disposed within the tire, for generating a signal indicative of the parameter of the tire;

a transmitter, in electrical communication with the sensor for transmitting the generated signal along a first communications link;

a monitor, in communication with the first communications link, for monitoring the tire parameter by receiving the generated signal;

a proqrammable processor, in electrical communication with the monitor for determining an alarm condition based upon the monitored tire parameter;

a communication unit in electrical communication with the processor having a first receiver for receiving a processor control command; and

a remote controller, positionable for electrical communication with the communication unit along a second communications link, for initiating the processor control command.

14. The system of claim 12 wherein the second communications link includes an inductively coupled channel.

16. The system of claim 12 wherein the remote controller generates a processor control command to change the selected threshold.

17. The system of claim 12 wherein the processor control command changes the system configuration.

13. A system for monitoring a parameter of an inflatable tire for a vehicle, the system comprising:

a sensor, disposed within the tire, for generating a signal indicative of the parameter of the tire;

a transmitter, in electrical communication with the sensor for transmitting the generated signal along a first communications link;

a piezo-electric element, for supplying power to the transmitter independent of inflation pressure of the time;

a capacitive element connected to the piezo-electric element for storing energy and providing power to the transmitter when the inflatable tire is stationary; and

a monitor, in communication with the first communications link, for monitoring the tire parameter by receiving the generated signal.

15. The system of claim 13 wherein the piezo-electric element is mounted on a weighted member which vibrates when the inflatable tire spins.