System for measuring pressure and/or temperature of a tire

• US 20050138998A1
• Filed: 12/01/2004
• Published: 06/30/2005
• Est. Priority Date: 12/30/2003
• Status: Active Grant

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group), Kia Motors Corporation (Kia Corp.)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group), Kia Motors Corporation (Kia Corp.)
• Inventors: Burm, Jin Wook, Park, Jin Ho
• Granted Patent: US 7,114,382 B2
• Time in Patent Office: Days
• US Class Current: 73/146
• 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

In a system for measuring pressure and/or temperature of a tire, reflectivity of reflectors is significantly enhanced and manufacture is significantly easier, since the system is provided with a board, an antenna provided to the board in order to send/receive a micro-wave to/from an external device, an IDT (inter-digital transducer) provided to the board and transducing the micro-wave into SAW (Surface Acoustic Wave), a waveguide part forming at least one looped channel of a polygonal shape on the board, the polygonal shape comprising a comer located at the IDT, and a plurality of reflectors provided to the at least one looped channel at comers different from the comer located at the IDT.

Claims

1. A system for measuring pressure and/or temperature of a tire, comprising:

a board;

an antenna provided to the board in order to send/receive a micro-wave to/from an external device;

an inter-digital transducer provided to the board and transducing the micro-wave into a surface acoustic wave;

a waveguide part forming at least one looped channel of a polygonal shape on the board, the polygonal shape comprising a corner located at the inter-digital transducer; and

a plurality of reflectors provided to the at least one looped channel at corners different from the corner located at the inter-digital transducer.

2. The system of claim 1, wherein the waveguide part is formed of material for absorbing the surface acoustic wave such that the surface acoustic wave is not seceded from the looped channel.

3. The system of claim 2, wherein:

the at least one looped channel comprises a first looped channel comprising a corner located at the inter-digital transducer; and

a second looped channel comprising a corner located at the inter-digital transducer,

wherein the first looped channel and the second looped channel are respectively located at a left side and a right side of the inter-digital transducer.

4. The system of claim 3, further comprising:

a pressure sensor provided to any one of the first and the second looped channels.

5. The system of claim 4, wherein the pressure sensor is connected to at least one of the plurality of reflectors.

6. The system of claim 3, wherein the first looped channel and the second looped channel have different lengths from each other.

7. The system of claim 3, wherein the first looped channel and the second looped channel are symmetrically located with respect to the inter-digital transducer.

8. The system of claim 1, wherein:

the at least one looped channel is formed of a rectangular shape; and

the plurality of reflectors are tilted at 45°

with respect to a side of the looped channel.

9. The system of claim 3, wherein the pressure sensor is connected to a reflector positioned to a diagonal direction of the inter-digital transducer.

10. The system of claim 3, wherein:

the at least one looped channel is formed of a rectangular shape;

the plurality of reflectors are tilted by 45°

with respect to a side of the looped channel; and

the pressure sensor is connected to a reflector positioned to a diagonal direction of the inter-digital transducer.