Tire Pressure Monitoring System Telegram with Suppressed ID

• US 20070090936A1
• Filed: 10/09/2006
• Published: 04/26/2007
• Est. Priority Date: 10/21/2005
• Status: Active Grant

• Current Assignee: Infineon Technologies AG
• Original Assignee: Infineon Technologies Sensonor AS (Infineon Technologies AG)
• Inventors: Nornes, Jan
• Granted Patent: US 7,511,608 B2
• Time in Patent Office: Days
• US Class Current: 340/447
• CPC Class Codes: B60C 23/0416 allocating a corresponding wheel position on vehicle, e.g. front/left or rear/right
• CPC Class Codes: B60C 23/0462 Structure of transmission protocol

Abstract

A tire pressure monitoring system receiver includes a storage unit to store transmitter IDs associated with a plurality tire pressure monitoring system transmitters, a receiving unit to receive a transmitted tire pressure monitoring system telegram and a transmitted checksum, a calculating unit to calculate a test checksum from the received telegram and one of the stored IDs, a comparing unit to compare the test checksum with the transmitted checksum, and an identification unit to identify a source transmitter from the test checksum in response to finding a match between the test checksum and the transmitted checksum.

Claims

1. A tire pressure monitoring system (TPMS) receiver comprising:

a storage unit configured to store transmitter identification values (IDs) associated with a plurality of tire pressure monitoring system (TPMS) transmitters, wherein each stored transmitter ID is associated with a respective TPMS transmitter;

a receiving unit configured to receive a transmitted tire pressure monitoring system (TPMS) telegram and a transmitted checksum calculated from the telegram and one of the transmitter IDs;

a calculating unit configured to calculate, on receipt of the telegram, a test checksum from the received telegram and one of the stored IDs;

a comparing unit configured to compare the test checksum with the received checksum; and

an identification unit configured to identify a source transmitter via a stored transmitter ID used to calculate the test checksum, in response to the comparing unit finding a match between the test checksum and the received checksum.

2. The TPMS receiver according to claim 1, wherein the number of TPMS transmitters is equal to an integer value between 2 and 20 inclusive.

3. The TPMS receiver according to claim 2, wherein the value equals 4.

4. The TPMS receiver according to claim 2, wherein the value equals 5.

5. The TPMS receiver according to claim 1, wherein the transmitter ID includes 32 bits.

6. The TPMS receiver according to claim 1, wherein the checksum includes one of 8 bits and 16 bits.

7. The TPMS receiver according to claim 1, wherein the checksum comprises a cyclic redundancy code (CRC) checksum.

8. A system for identifying which transmitter from a plurality of transmitters in a tire pressure monitoring system (TPMS) is a source transmitter for a tire pressure monitoring system (TPMS) telegram, the system comprising:

a TPMS receiver according to claim 1;

a second calculating unit configured to calculate a checksum from a TPMS telegram and a transmitter ID; and

a transmitting unit configured to transmit the TPMS telegram and the checksum.

9. A method of identifying which transmitter from a plurality of transmitters in a tire pressure monitoring system (TPMS) is a source transmitter of a TMPS telegram, the method comprising:

calculating a checksum from the TPMS telegram and a transmitter identification value (ID);

transmitting the TPMS telegram to a receiver;

transmitting the calculated checksum to the receiver;

calculating a test checksum from the transmitted TPMS telegram and a stored transmitter ID associated with one of the plurality of transmitters;

comparing the test checksum with the transmitted checksum; and

identifying the source transmitter via the stored transmitter ID used to calculate the test checksum in response to finding a match during the comparison between the test checksum and the transmitted checksum.

10. The method of claim 9, wherein the calculating and comparing are repeated until a test checksum is found to match the transmitted checksum.

11. The method of claim 9, wherein the number of TPMS transmitters is equal to an integer value between 2 and 20 inclusive

12. The method of claim 11, wherein the value equals 4.

13. The method of claim 11, wherein the value equals 5.

14. The method of claim 9, wherein the transmitter ID comprises 32 bits.

15. The method of claim 9, wherein the checksum includes one of 8 bits and 16 bits.

16. The method of claim 9, wherein the checksum comprises a cyclic redundancy code (CRC) checksum.