Keyless entry module and method

• US 7,511,602 B2
• Filed: 01/10/2006
• Issued: 03/31/2009
• Est. Priority Date: 08/19/2003
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: General Motors Corporation (Motors Liquidation Co. GUC Trust)
• Inventors: Huntzicker, Fred W.
• Primary Examiner(s): Zimmerman; Brian A
• Assistant Examiner(s): Nguyen; Nam V
• Application Number:
  US11/328,533
• Publication Number:
  US 20060170532A1
• Time in Patent Office: 1,176 Days
• Field of Search: 340/5.54, 340/5.85, 340/825.69, 340/825.72, 341/173, 341/176, 713/164
• US Class Current: 340/5.54
• CPC Class Codes: G07C 2009/00206 the keyless data carrier being hand operated
• CPC Class Codes: G07C 9/00182 operated with unidirectional data transmission between data carrier and locks
• CPC Class Codes: G07C 9/0069 actuated in a predetermined sequence

Abstract

Methods and apparatus are provided for a key-less system for actuating a lock responsive to a valid OPEN signal. A first portion is continuously coupled to a power source and a second portion receives power from the source only when a coupling switch is ON. The first portion comprises a keypad for entry of a lock actuation code, and a detector that senses the first keystroke and turns the switch ON. The second portion includes an RF transmitter and preferably a memory with valid actuation codes stored therein, and a processor coupled to the memory, to the keypad and to the RF transmitter. When the entered and stored keystrokes match, the RF transmitter sends an OPEN signal to the lock. The method comprises detecting the first keystroke, turning on the power switch ON, comparing the entered and stored keystrokes and if matched, transmitting an OPEN command to the lock.

Claims

1. A method for operating a key-less fob comprising, operatively coupled, a keypad, processor, memory and transmitter, for remotely actuating a system responsive to RF signals from the transmitter, the method comprising:

receiving multiple initial keystrokes from the keypad in an initial operating mode;

during a fist timeout period associated with the initial operating mode, comparing the received initial keystrokes to a plurality of valid codes stored in the memory and, in response to the initial keystrokes matching a first one of the plurality of valid codes, directing the transmitter to actuate at least a portion of the system; and

in response to a second keystrokes matching a second one of the plurality of valid codes different from the first one of the plurality of valid codes stored in the memory, switching the key-less fob from the initial operating mode to a command operating mode different from the initial operating mode where subsequent command keystrokes received after the initial keystrokes and prior to an expiration of a second timeout period each result in transmitting to the system a command adapted to remotely actuate at least a portion of the system, the command corresponding to the subsequent command keystroke, and being transmitted without repeating of the initial keystrokes during the second timeout period.

2. The method of claim 1, wherein the one or more command keystrokes comprise single individual keystrokes.

3. The method of claim 1, further comprising, data-logging at least the initial and one or more of the further key-strokes to provide a record of such key-strokes.

4. The method of claim 1, further comprising, after the transmitting step, determining whether the second timeout period has expired and if so, returning the key-less fob to the initial operating mode thereby requiring re-entry of the multiple initial keystrokes before the key-less fob can again enter the command operating mode.

5. The method of claim 1, wherein the key-less fob further includes a power ON/OFF switch and the method further comprises, before the receiving step, detecting at least a first keystroke, turning the power switch ON in response to detecting the at least first keystroke, thereby powering-up at least the transmitter.

6. The method of claim 5, further comprising turning the power switch OFF after the expiration of the first timeout period.

7. The method of claim 5, wherein the step of turning the power switch ON, comprises, powering-up the memory and the processor as well as the transmitter.

8. A method of operating a wireless key-fob comprising, operatively coupled, at least an ON/OFF switch, a keypad, a processor, a memory and a transmitter adapted to remotely actuate a vehicle system in an INSECURE and a SECURE mode when ON, the method comprising:

in response to an initial keystroke, setting the ON/OFF switch to an ON condition to thereby place the wireless key-fob in the INSECURE MODE, wherein the INSECURE MODE comprises a first timeout period;

while in the INSECURE MODE, sending initial ENTRY CODE keystrokes from the keypad to the processor;

using the processor to compare the initial ENTRY CODE keystrokes received from the keypad with a plurality of ENTRY CODE keystrokes stored in the memory to determine whether or not a valid ENTRY CODE has been provided;

if a first one of the plurality of valid ENTRY CODE keystrokes was provided in the INSECURE MODE, directing the transmitter to actuate the vehicle system;

if a second one of the plurality of valid ENTRY CODE keystrokes different from the first valid ENTRY CODE keystrokes was provided in the INSECURE MODE, shifting directly from the INSECURE MODE to a SECURE MODE, wherein the SECURE MODE is different from the INSECURE MODE, wherein the SECURE MODE comprises a second timeout period, and transmitting a signal to the system, the signal derived from the second one of the plurality of valid ENTRY CODE keystrokes and indicating that an authorized user is present;

while in the SECURE MODE, receiving subsequent command codes from the authorized user on the keypad and transmitting the subsequent command codes to the vehicle system without requiring repeating the initial ENTRY CODE keystrokes; and

setting the ON/OFF switch to an OFF condition, wherein the setting takes place after the first timeout period when the wireless key-fob is in the INSECURE MODE and after the second timeout period when the key-fob is in the SECURE MODE.

9. The method of claim 8, wherein shifting to the SECURE MODE further comprises setting a flag in the memory indicating that the subsequent command codes can be accepted from the user without re-entry of the initial ENTRY CODE keystrokes.

10. The method of claim 9, wherein the subsequent command codes comprise fewer keystrokes than the initial ENTRY CODE keystrokes.

11. The method of claim 8, further comprising recording keystrokes entered in the INSECURE mode in memory for later retrieval.

12. The method of claim 11, further comprising also recording keystrokes entered in the SECURE mode in memory for later retrieval.

13. A key-less control fob adapted to be toggled between at least two modes of operation for actuating a remote system, comprising:

a user actuated keypad for entering keystroke sequences of variable lengths P and Q;

a processor operatively coupled to the keypad for receiving and analyzing keystroke sequences from the keypad;

a memory operatively coupled to the processor for storing valid keystroke sequences;

a transmitter operatively coupled to the processor for sending out signals containing commands adapted to actuate the remote system;

wherein, in a first mode of operation, the processor compares keystroke sequences entered on the keypad of length P to the keystroke sequences stored in the memory; and

if the keystroke sequences match a first one of the plurality of valid keystroke sequences, the processor directs the transmitter to actuate the remote system; and

if the keystroke sequences entered at the keypad match a second one of the plurality of valid keystroke sequences different from the first one of the plurality of valid keystroke sequences stored in the memory, then the processor switches operation of the fob to a second mode of operation different from the first mode of operation wherein subsequent keystroke sequences of length Q, wherein Q is less than P, cause the transmitter to send valid commands to the remote system based upon the subsequent keystroke sequences of length Q.

14. The key-less control fob of claim 13, wherein Q is not greater than 2.

15. The key-less control fob of claim 14, wherein Q=1.

16. The key-less control fob of claim 13, further comprising a time-delay operatively coupled to the processor and adapted to cause the processor to switch the fob from the second to the first mode of operation after a predetermined length of time without further keystrokes in the second mode.

17. The key-less control fob of claim 13, further comprising a power ON/OFF switch operatively coupled to the processor and at least two timers operatively coupled to or contained within the processor for providing first and second time delays since a last keystroke, wherein the first time delay applies when the key-less control fob is in the first mode of operation and the second time delay applies when the key-less control fob is in the second mode of operation, and upon expiration of either time delay, the power ON/OFF switch places the key-less control fob in a sleep mode.

18. The key-less control fob of claim 13, further comprising a power ON/OFF switch operatively coupled to the processor, wherein when the power ON/OFF switch is to be turned OFF, the processor stores in memory an indicator of the user desired mode of operation of the key-less control fob to be effective when the key-less control fob is reawakened by the power ON/OFF switch being turned ON.

19. The key-less control fob of claim 13, further comprising a power ON/OFF switch operatively coupled to the processor, wherein before the power ON/OFF switch is turned OFF, some or all of the keystrokes executed by the user since the power ON/OFF switch was last turned ON, are stored for later retrieval.