Signal recognition for combined receiver for remote keyless entry and tire pressure monitoring systems

• US 20060279411A1
• Filed: 06/14/2006
• Published: 12/14/2006
• Est. Priority Date: 06/14/2005
• Status: Active Grant

• Current Assignee: Continental Automotive Systems, Inc. (Continental AG)
• Original Assignee: Siemens VDO Automotive Corporation (Siemens AG)
• Inventors: Desai, Tejas, Reimus, David
• Granted Patent: US 7,668,259 B2
• Time in Patent Office: Days
• US Class Current: 340/10.330
• 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
• CPC Class Codes: B60R 25/2072 with means for preventing jamming or interference of a remote switch control signal
• CPC Class Codes: B60R 25/24 using electronic identifiers containing a code not memorised by the user

Abstract

A receiver is utilized to receive signals from various systems within a vehicle such as tire pressure monitoring system (TPM) and a remote keyless entry system (RKE). During the on time, the receiver sequentially is open to receive a first signal with a first baud rate. If the signal of the first baud rate is not received, the receiver receives a second signal at a second baud rate. Upon receipt of a transmission, the receiver operates according to a mode that corresponds to the transmission indicated by the specific baud rate. The operation of the receiver can include specialized filtering, or other known signal processing that is tailored to the specific transmission data communication requirements.

Claims

1. A method of operating a receiver comprising the steps of:

a) receiving a first signal including a wake up portion that initiates operation of the receiver;

b) determining a baud rate of the received signal; and

c) tailoring operation of the receiver responsive to the determined baud rate of the received signal.

2. The method as recited in claim 1, including receiving a second signal having a different baud rate than the first signal.

3. The method as recited in claim 2, wherein said step c comprises tailoring operation of the receiver according to a desired preference between the first signal and the second signal.

4. The method as recited in claim 1, wherein the receiver is operated to receive one of the first and second signals at desired intervals.

5. The method as recited in claim 4, wherein each of the first and second signals include a wake up portion that is transmitted for a time greater than the desired intervals.

6. The method as recited in claim 5, wherein the wake up portion of the first and second signals are of a common frequency modulation.

7. The method as recited in claim 6, wherein the wake up portion of the first and second signals are an amplitude keyed signal.

8. The method as recited in claim 5, wherein a remainder of the first and second signals are modulated differently.

9. The method as recited in claim 1, wherein the receiver sequentially seeks a signal of a first baud rate and then a signal having a second baud rate.

10. The method as recited in claim 2, wherein the first baud rate comprises 2.4 Kbits/second and the second baud rate comprises 9/6 Kbits/second.

11. A method of tailoring operation of a receiver for receiving transmissions from a vehicle system comprising the steps of:

a) receiving a transmission having a wake up portion;

b) identifying the transmission based on a transmission rate of the wake up portion; and

c) switching the receiver to a mode of operation corresponding with the transmission responsive to identifying the transmission based on the transmission rate of the wake up portion.

12. The method as recited in claim 11, comprising receiving a first transmission prior to a second transmission according to a desired sequential order.

13. The method as recited in claim 12, wherein the first transmission comprise a first transmission rate, and the second transmission comprises a second transmission rate different than the first transmission rate.

14. The method as recited in claim 12, including receiving the second transmission responsive the absence of the first transmission.

15. The method as recited in claim 11, wherein step c includes filtering the transmission according to the identity of the transmission based on the wake up portion of the transmission.

16. The method as recited in claim 11, wherein the wake up portion comprises an amplitude shift keyed modulation.

17. A receiver for receiving signals from both a remote keyless entry system and a tire pressure monitoring system comprising:

a controller for determining a transmission rate of an incoming signal; and

a filter switched between modes of operation responsive to the determined transmission rate for processing the incoming signal according to unique parameter corresponding to the determined incoming signal.

18. The receiver as recited in claim 17, wherein the controller operates to receive a first incoming signal including a first transmission rate preferentially over a second incoming signal including a second transmission rate.

19. The receiver as recited in claim 18, wherein the controller receives the second incoming signal in the absence of the first signal and the filter is switched to a mode of operation for processing the second signal responsive to the determined transmission rate.