Electronic locking system having a lock and a method for re-synchronization

• US 4,825,210 A
• Filed: 08/12/1987
• Issued: 04/25/1989
• Est. Priority Date: 08/12/1986
• Status: Expired due to Term

• Current Assignee: BMW AG (Bayerische Motoren Werke AG), Siemens AG
• Original Assignee: Siemens AG
• Inventors: Bachhuber, Anton, Proske, Arnost
• Primary Examiner(s): Griffin, Robert L.
• Assistant Examiner(s): Kuntz, Curtis
• Application Number:
  US07/085,075
• Time in Patent Office: 622 Days
• Field of Search: 455/151, 455/92, 455/68, 340/825.31, 340/825.34, 340/825.69, 340/825.72, 340/825.3, 340/542, 340/520, 340/825.32, 340/825.54, 340/825.76, 340/528, 340/63-65, 307/10 AT, 307/10 R, 70/256, 70/257, 361/172
• US Class Current: 340/5.31
• CPC Class Codes: G07C 2009/00238 the transmittted data signal containing a code which is changed
• CPC Class Codes: G07C 2009/00785 by light
• CPC Class Codes: G07C 2209/06 Involving synchronization or resynchronization between transmitter and receiver; reordering of codes
• CPC Class Codes: G07C 9/00182 operated with unidirectional data transmission between data carrier and locks
• CPC Class Codes: Y10T 70/5973 Remote control

Abstract

An electronic locking system and method provides a control unit in a receiver to open a lock of a locking system when a transmission sequence output by a transmitter of the electronic locking system coincides with a reference sequence within a re-synchronization region in the receiver, the transmission sequence being formed by a user by repeated actuation of the transmitter and stored in a mark memory of the receiver. If necessary, the synchronization unit synchronizes the reference generator to the most recent transmission mark of the transmission sequence.

Claims

1. An electronic locking system including a lock comprising:

a transmitter having;

means for emitting a transmission signal modulated with a transmission mark at every transmission event,

a mark generator connected preceding said emitting means and operable to provide said transmission mark form a sequence of transmission marks for modulating every transmission signal emitted by said emitting means;

a receiver having;

means for receiving said transmission signal, said receiving means having a reference generator for supplying a reference mark from a sequence of reference marks that is identical to said sequence of transmission marks of said mark generator, said reference generator being driven to a new reference mark of said sequence of reference marks by said every transmission signal received by said receiver,

a synchronizing unit connected to said receiving means and said reference generator to compare said transmission mark of said transmission signal received by said receiver to said reference mark supplied by said reference generator, said synchronizing unit restoring synchronization between said receiver and said transmitter when said transmission mark and said reference mark lie within a re-synchronization region which extends over an excerpt from said sequence of reference marks, said synchronization unit having;

a mark memory in which a transmission sequence is stored, said transmission sequence being said transmission marks for a predetermined number of successive transmission signals,

said synchronization unit being operable to synchronize said reference generator to a reference mark which is identical to an nth transmission mark of said transmission sequence when a reference sequence of n reference marks which is identical to said transmission sequence is present in said re-synchronization region; and

a control unit connected to open the lock upon said reference mark supplied by said reference generator being identical to said transmission mark of said transmission signal received by said receiver.

2. An electronic locking system as claimed in claim 1, wherein said synchronization unit is operable to re-synchronize said reference generator to a reference mark identical to said received transmission mark upon lack of synchronization when said transmission mark is present within a capture sequence of reference marks which extends over only a beginning portion of said re-synchronization region.

3. An electronic locking system as claimed in claim 2, further comprising:

means in said receiver for setting a length of said capture sequence.

4. An electronic locking system as claimed in claim 1, further comprising:

means in said receiver for setting a length of said reference sequence.

5. An electronic locking system as claimed in claim 1, further comprising:

means in said receiver for setting a length of said re-synchronization region.

6. An electronic locking system as claimed in claim 1, further comprising:

a timer connected to said synchronization unit in said receiver and being driven by said synchronization unit to inhibit said receiver during a waiting time during which no resynchronization is possible within the resynchronization region.

7. An electronic locking system as claimed in claim 6, further comprising:

an old value memory unit connected to said reference generator and into which a most recent old value of said reference mark is deposited; and

said synchronization unit setting said reference generator to said most recent old value after a failed re-synchronization.

8. An electronic locking system as claimed in claim 1, further comprising:

a trigger in said transmitting which emits a trigger signal upon actuation;

said mark generator being connected to said trigger and generating a transmission mark according to a prescribed algorithm upon receipt of said trigger signal;

a modulator connected to receive said transmission mark from said mark generator which modulates a selection signal with said transmission mark; and

said emitting means being an emitter connected to an output of said modulator, said emitter being driven by said modulated selection signal from said modulator so that a transmission signal which is modulated with a transmission mark is output at every transmission event.

9. An electronic locking system as claimed in claim 1, further comprising:

said receiving means being a sensor for picking up a transmission signal from said transmitter

a reference generator which supplies a reference mark from a sequence of reference marks which is identical to a sequence of transmission marks from said transmitter and which is drive to a new reference mark of said sequence of reference marks by each and every received transmission signal;

a synchronization unit which compares said transmission mark to said reference mark being supplied by said reference generator following receipt of every transmission signal, said synchronization unit restoring synchronization of said receiver to said transmitter when said transmission mark and said reference mark lie within a re-synchronization region which extends over an excerpt from said sequence of reference marks given lack of identity; and

control unit connected to open said lock upon identity of said transmission mark and said reference mark when said receiver is synchronized with said transmitter.

10. A method for re-synchronizing a receiver and a transmitter of an electronic locking system having at least one lock, comprising the steps of:

emitting a transmission signal from said transmitter at every transmission event, said transmission signal being modulated with a transmission mark from a sequence of transmission marks;

storing a transmission sequence which is composed of the transmission marks of m successive transmission signals in said receiver;

setting a new value of a reference mark from a sequence of reference marks in said receiver which is identical to said sequence of said transmission marks at every transmission signal;

comparing every current transmission mark to said new value of said reference mark in said receiver;

opening said lock upon establishing identity of said transmission mark and said new value of said reference mark; and

re-synchronizing said transmitter and said receiver when a reference mark which is identical to a current transmission mark lies within a re-synchronization region which extends over a excerpt from said sequence of reference marks upon lack of identity between said transmission mark and said reference mark, said re-synchronization being carried out when a reference signal composed of n reference marks which is identical to the transmission sequence is present within the re-synchronization region.