REMOTE KEYLESS ENTRY SYSTEM FOR A VEHICLE AND A METHOD OF CONTROLLING A VEHICLE FUNCTION BY THE SAME

• US 20080088411A1
• Filed: 09/28/2006
• Published: 04/17/2008
• Est. Priority Date: 09/28/2006
• Status: Active Grant

• Current Assignee: Lear Corporation
• Original Assignee: Lear Corporation
• Inventors: Nantz, John S., Ghabra, Riad, King, Ronald O., Tang, Tom Q.
• Granted Patent: US 7,724,125 B2
• Time in Patent Office: Days
• US Class Current: 340/5.64
• CPC Class Codes: B60R 25/24 using electronic identifiers containing a code not memorised by the user
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 30/18054 at stand still, e.g. engine in idling state hill holding B60W30/18118
• CPC Class Codes: B60W 30/192 Mitigating problems related to power-up or power-down of the driveline, e.g. start-up of a cold engine
• CPC Class Codes: G07C 2009/00198 the keyless data carrier having more than one limited data transmission ranges
• CPC Class Codes: G07C 2009/00793 by Hertzian waves
• CPC Class Codes: G07C 9/00182 operated with unidirectional data transmission between data carrier and locks
• CPC Class Codes: G08C 17/02 using a radio link

Abstract

A remote unit for a keyless entry system for a vehicle. The remote unit comprising a controller configured to generate a command signal in response to a user input. The command signal comprising a first command message and a substantially similar second command message. The first command message comprises a first low data rate portion and the second command message comprises a high data rate portion. The remote unit further comprising a transmitter configured to transmit the command.

Claims

1. A remote unit for a keyless entry system, the remote unit comprising:

a controller configured to generate a command signal in response to a user input, the command signal comprising a first command message and a substantially similar second command message, wherein the first command message comprises a first low data rate portion and the second command message comprises a high data rate portion; and

a transmitter configured to transmit the command signal.

2. The remote unit according to claim 1 wherein the first low data rate portion has a transmission data rate in the range of approximately 500 to 2K bits/second and the high data rate portion has a transmission data rate in the range of approximately 5K and 20K bits/second.

3. The remote unit according to claim 1 wherein the user input corresponds to actuation of a manually-activated control element.

4. The remote unit according to claim 1 wherein the high data rate portion has a power transmission in the range of approximately 60 to 74 dBμ

V/m and the first low data rate portion has a power transmission in the range of approximately 78 to 95 dBμ

V/m.

5. The remote unit according to claim 1 wherein the first low data rate portion precedes the high data rate portion.

6. The remote unit according to claim 5 wherein the first command message further comprises a second low data rate portion, wherein the high data portion precedes the second low date rate portion.

7. A vehicle-mounted base unit for a keyless entry system, the vehicle-mounted base unit comprising:

a receiver configured to receive a command signal corresponding to a user input, the command signal comprising a first command message and a substantially similar second command message, wherein the first command message comprises a first low data rate portion and the second command message comprises a high data rate portion; and

a controller configured to control a vehicle function in response to the command signal.

8. The vehicle-mounted base unit according to claim 7 wherein the first low data rate portion has a transmission data rate in the range of approximately 500 to 2K bits/second and the high data rate portion has a transmission data rate in the range of approximately 5K and 20K bits/second.

9. The vehicle-mounted base unit according to claim 7 wherein the user input corresponds to actuation of a manually-activated control element.

10. The vehicle-mounted base unit according to claim 7 wherein the high data rate portion has a power transmission in the range of approximately 60 to 74 dBμ

V/m and the first low data rate portion has a power transmission in the range of approximately 78 to 95 dBμ

V/m.

11. The vehicle-mounted base unit according to claim 7 wherein the first low data rate portion precedes the high data rate portion.

12. The vehicle-mounted base unit according to claim 11 wherein the first command message further comprises a second low data rate portion, wherein the high data rate portion precedes the second low data rate portion.

13. A keyless entry system for a vehicle, the keyless entry system comprising:

a remote unit configured to transmit a command signal in response to a user input, the command signal comprising a first command message and a substantially similar second command message, wherein the first command message comprises a first low data rate portion and the second command message comprises a high data rate portion; and

a vehicle-mounted base unit configured to receive the command signal and to control a vehicle function in response to the command signal.

14. The keyless entry system according to claim 13 wherein the first low data rate portion has a transmission data rate in the range of approximately 500 to 2K bits/second and the high data rate portion has a transmission data rate in the range of approximately 5K and 20K bits/second.

15. The keyless entry system according to claim 13 wherein the user input corresponds to actuation of a manually-activated control element.

16. The keyless entry system according to claim 13 wherein the high data rate portion has a power transmission in the range of approximately 60 to 74 dBμ

V/m and the first low data rate portion has a power transmission in the range of approximately 78 to 95 dBμ

V/m.

17. The keyless entry system according to claim 13 wherein the first command message is received by the vehicle-mounted base unit when the remote unit transmits the command signal within 500 m.

18. The keyless entry system according to claim 13 wherein the first low data rate portion precedes the high data rate portion.

19. The keyless entry system according to claim 18 wherein the first command message further comprises a second low data rate portion, wherein the high data rate portion precedes the second low data rate portion.

20. The keyless entry system according to claim 18 wherein the first low data rate portion initiates the receiver.