Method for resetting a central lock system of a motor vehicle with a remote actuating device

• US 5,798,576 A
• Filed: 08/09/1996
• Issued: 08/25/1998
• Est. Priority Date: 09/08/1995
• Status: Expired due to Fees

• Current Assignee: Kiekert AG (Lingyun Industrial Corporation Limited)
• Original Assignee: Kiekert AG (Lingyun Industrial Corporation Limited)
• Inventors: Welskopf, Fred, Ostermann, Wilfried
• Primary Examiner(s): Shoop, Jr., William M.
• Assistant Examiner(s): Ganjian, Peter
• Application Number:
  US08/694,908
• Time in Patent Office: 746 Days
• Field of Search: 307/9.1-10.8, 361/171, 340/425.5, 340/426, 340/534, 340/825.31, 340/825.34, 340/825.69, 340/82, 340/72, 180/287, 123/198 B, 123/198 DB, 123/198 DC, 364/423.098, 364/423.099, 364/424.034, 364/424.037, 364/424.038, 364/424.04, 364/424.045, 364/424.059
• US Class Current: 307/10.3
• CPC Class Codes: E05B 77/48 by electrical means
• CPC Class Codes: G07C 2009/00769 with data transmission performed by wireless means
• CPC Class Codes: G07C 2009/00873 by code input from the lock
• CPC Class Codes: G07C 9/00182 operated with unidirectional data transmission between data carrier and locks

Abstract

A central-locking system is reset upon loss of a portable remote-control unit and replacement by another in a system in which a diagnostic device is temporarily connected and switched to the stationary part of the locking system into a "SETUP" mode. The key is then inserted into a key-operated switch to interrogate the transponder with the transceiver and from the latter the key-identification code word stored in the transponder and the transponder initial code word are transferred. The key-identification code word and transponder initial code word are stored in a code-word memory and the transmitter is then operated to send a remote-control changing code word to the receiver and enables switching back to the "NORMAL" mode of operation and removal of the diagnostic device.

Claims

1. A method of operating a central lock system of a motor vehicle having a remote-control arrangement of locking and unlocking the central lock system and wherein the remote-control arrangement comprises a mobile part separate from the motor vehicle and a fixed part on the motor vehicle, said mobile part comprising a transmitter, a transponder and a key, said fixed part comprising a receiver, a transponder querying transceiver and a key-operated switch operable by said key, said method comprising the steps of:

(a) independently of a manual actuation of said transmitter, synchronously advancing a remote-control changing code word in said transmitter and a transceiver code word in said transceiver;

(b) for a NORMAL mode of operation, manually actuating said transmitter to transmit a then-effective remote-control changing code word to said receiver and effecting an identity comparison of said then-effective remote-control changing code work as transmitted to said receiver with a then-effective transceiver code word in said transceiver;

(c) selectively effecting a locking or unlocking operation upon said comparison registering correspondence of said then-effective remote-control changing code work as transmitted to said receiver with said then-effective transceiver code word in said transceiver within a given divergence window;

(d) upon occurrence of an event requiring resetting of said system, temporarily connecting a diagnostic device to said fixed part for initializing same and switching said fixed part into a SETUP mode;

(e) with said fixed part in said SETUP mode, inserting said key into said key-operated switch and actuating said key-operated switch, thereby interrogating said transponder with said transponder-querying transceiver, deriving a key-identification code word stored in said transponder as well as a transponder initial code word from said transponder and storing said key-identification code word and said transponder initial code word respectively in a key-identification code word memory and a transceiver code word memory of said transponder querying transceiver;

(f) then operating said transmitter to send a remote-control changing code word advancing in said transmitter to said receiver and picking up the then-effective remote-control changing code word with said receiver; and

(g) then switching said fixed part to said NORMAL mode of operation and removing said diagnostic device.

2. The method defined in claim 1 wherein said central lock system has a plurality of said mobile parts with different key-identification code words, steps (d) through (f) being carried out with said fixed part in said SETUP mode for each of said mobile parts.

3. The method defined in claim 2 wherein the maximum number of said mobile parts for said central lock system is five.

4. The method defined in claim 2 wherein, for mobile parts having key-identification code words corresponding to key-identification code words stored in memory in said fixed part, there is no further query to the fixed part by the transceiver.

5. The method defined in claim 1 wherein, after a resetting of the central lock system, for a predetermined period a display of said fixed part displays an indication of "substitute key" programming thereof after each operation of the motor vehicle.

6. The method defined in claim 5 wherein said predetermined period is 72 hours.