Tire pressure monitoring system

• US 20060273890A1
• Filed: 06/03/2005
• Published: 12/07/2006
• Est. Priority Date: 06/03/2005
• Status: Abandoned Application

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Meyerhoff, Jerry D., Kontogeorgakis, Christos
• Application Number:
  US11/144,466
• Publication Number:
  US 20060273890A1
• Time in Patent Office: Days
• US Class Current: 340/445
• CPC Class Codes: B60C 23/0408 transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
• CPC Class Codes: B60C 23/0452 Antenna structure, control or arrangement vehicle tyre mounted antennas H01Q1/2241
• CPC Class Codes: B60C 23/0494 Valve stem attachments positioned inside the tyre chamber
• CPC Class Codes: H01Q 1/2241 used in or for vehicle tyres

Abstract

A tire pressure monitoring system (TPMS) (100) includes an inverted F-antenna (102), stem (106) and meandering radiator element (104). The TPMS'"'"'s operating frequency is controlled by the electrical length of the meandering radiator element (104) without the use of matching circuitry.

Claims

1. A tire pressure monitoring system (TPMS), including:

an inverted F antenna;

a meandering radiating element coupled to the inverted F antenna; and

a stem coupled to the meandering radiating element.

2. The TPMS of claim 1, wherein the TPMS'"'"'s operating frequency is tuned by the electrical length of the meandering radiator element.

3. The TPMS of claim 2, wherein the operating frequency is controlled by the electrical length of the meandering radiator element without the use of matching circuitry.

4. The TPMS of claim 1, wherein the inverted F antenna provides a ground connection and a feed connection via coupling to a circuit board.

5. The TPMS of claim 4, wherein the ground and feed connections are orientated along a z-axis and the meandering radiator element is oriented in an x-y plane of an x-y-z orientation.

6. The TPMS of claim 1, wherein the meandering radiator element comprises a conductive wire.

7. The TPMS of claim 1, wherein the stem includes a stem valve and the meandering radiator element is flexibly coupled to the stem valve.

8. The TPMS of claim 1, wherein the TPMS is mounted via the stem to a wheel well inside a tire'"'"'s air chamber.

9. The TPMS of claim 1, wherein the TPMS provides direct tire pressure monitoring.

10. The TMPS of claim 4, further including:

an air pressure sensor for sensing tire pressure information; and

a transmitter for transmitting the tire pressure information through the feed to the meandering radiator element.

11. A vehicle, including:

a receiver;

a tire having a wheel well; and

a tire pressure monitoring system (TPMS) mounted to the interior of the wheel well, the TMPS transmitting tire pressure information via an inverted F antenna coupled to a meandering radiator element feeding into a stem.

12. The vehicle of claim 11, wherein the TMPS has an operating frequency tuned by the meandering radiator element'"'"'s electrical length without matching circuitry.

13. The vehicle of claim 11, the meandering radiator element is flexibly coupled to the stem.