Tire condition monitoring apparatus

• US 6,861,950 B2
• Filed: 06/26/2002
• Issued: 03/01/2005
• Est. Priority Date: 06/28/2001
• Status: Active Grant

• Current Assignee: Pacific Industrial Company Limited
• Original Assignee: Pacific Industrial Company Limited
• Inventors: Katou, Michiya
• Primary Examiner(s): GOINS, DAVETTA WOODS
• Application Number:
  US10/184,004
• Publication Number:
  US 20030016126A1
• Time in Patent Office: 979 Days
• Field of Search: 731/46, 731/462, 731/465, 737/56, 340/447, 340/438, 340/445, 340/442, 340/435, 340/903, 340/456, 340/453, 340/471, 116/34.R
• US Class Current: 340/447
• 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 23/0462 Structure of transmission protocol

Abstract

Different types of data included in a signal transmitted by a transmitter, except for synchronous data, are each configured by a binary code signal of a predetermined bit count. The synchronous data is configured by a signal of a pattern different from the bit codes that configure the data other than the synchronous data. This enables a receiver to recognize the synchronous data in the transmitted signal easily and reliably. Further, the data length of the synchronous data is shortened. This shortens the data length of the signal, thus ensuring optimal wireless communication between the transmitter and the receiver.

Claims

1. A tire condition monitoring apparatus for monitoring the condition of a tire attached to a vehicle, comprising:

a transmitter, wherein the transmitter is driven by a battery for detecting the condition of the tire and wirelessly transmitting a signal including condition data that indicates the detected tire condition; and

a receiver, wherein the receiver receives the signal transmitted by the transmitter and processes the received signal;

wherein;

the signal transmitted by the transmitter includes synchronous data, which is provided at the beginning of the transmitted signal;

the data included in the transmitted signal other than the synchronous data is configured by a binary code signal;

the synchronous data is configured by a specific signal that has a pattern different from the binary code signal; and

the synchronous data is configured of a high level signal alternately timed with a low level signal.

2. The apparatus according to claim 1, wherein the synchronous data is a signal corresponding to one cycle that is configured by a combination of a high level for a first timed interval and a low level signal for a second time interval different from the first timed interval.

3. The apparatus according to claim 1, wherein the configuration of the synchronous data includes a portion of a pattern of the binary code signal.

4. The apparatus according to claim 1, wherein the synchronous data is configured by combining portions of patterns of bit codes “

0” and

“

1”

, which configure the binary code signal.

5. The apparatus according to claim 1, wherein the transmitted signal includes successive data frames, and the synchronous data is provided at the beginning of each of the data frames.

6. A transmitter of a tire condition monitoring apparatus, wherein the transmitter is driven by a battery and comprises:

a sensor for detecting the condition of a tire; and

a transmitting circuit, wherein the transmitting circuit generates a signal including condition data that indicates the detected tire condition and wirelessly transmits the signal;

wherein;

the transmitted signal includes synchronous data, which is provided at the beginning of the transmitted signal;

the data included in the transmitted signal other than the synchronous data is configured by a binary code signal;

the synchronous data is configured by a specific signal that has a pattern different from the binary code signal; and

the synchronous data is configured of a high level signal alternately timed with a low level signal.

7. The transmitter according to claim 6, wherein the synchronous data is a signal corresponding to one cycle that is configured by a combination of a high level signal for a first timed interval and a low level signalfor a second time interval different from the first timed interval.

8. The transmitter according to claim 6, wherein the configuration of the synchronous data includes a portion of a pattern of the binary code signal.

9. The transmitter according to claim 6, wherein the synchronous data is configured by combining portions of patterns of bit codes “

0” and

“

1”

, which configure the binary code signal.

10. The transmitter according to claim 6, wherein the transmitted signal includes successive data frames, and the synchronous data is provided at the beginning of each of the data frames.

11. A method of monitoring the condition of a tire using a transmitter and a receiver, the method comprising the steps of:

detecting a condition of a tire and generating a corresponding data signal, wherein the data signal includes synchronous data and information data; and

configuring the data signal such that the synchronous data has a pattern that is different than the binary code pattern of the information data so as to shorten the length of the data signal,

wherein the configuring step is such that the pattern of the synchronous data includes a high level signal alternately timed with a low level signal.

12. The method of claim 11, further comprising the steps of:

transmitting the data signal to the receiver; and

receiving the data signal with the receiver.

13. The method of claim 12, wherein said receiving step is performed intermittently.

14. The method of claim 12, wherein said receiving step is preformed at a predetermined time interval.

15. The method of claim 11, wherein the synchronous data is a signal corresponding to one cycle that is configured by a combination of a high level signal for a first timed interval and a low level signal for a second time interval different from the first timed interval.

16. The method of claim 11, wherein the information data is configured by a binary code signal.

17. The method of claim 11, wherein the synchronous data is configured by combining portions of bit code “

0” and

“

1”

which are used to configure the information data as a binary code signal.

18. A tire condition monitoring apparatus for monitoring the condition of a tire attached to a vehicle, comprising:

a transmitter that detects a condition of the tire and wirelessly transmits a signal indicative of the tire condition;

wherein the signal transmitted by the transmitter includes both synchronous data and data other than the synchronous data;

wherein the data other than the synchronous data is configured by a binary code signal and the synchronous data is configured by a signal that has a pattern different from the binary code signal; and

wherein the synchronous data is configured of a high level signal alternately timed with a low level signal.

19. The apparatus according to claim 18, wherein the synchronous data is a signal corresponding to one cycle that is configured by a combination of a high level signal and a low level signal.

20. The apparatus according to claim 18, wherein the configuration of the synchronous data includes a portion of a pattern of the binary code signal.