GB2133073A - A central locking system for a motor vehicle - Google Patents

A central locking system for a motor vehicle Download PDF

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Publication number
GB2133073A
GB2133073A GB08400534A GB8400534A GB2133073A GB 2133073 A GB2133073 A GB 2133073A GB 08400534 A GB08400534 A GB 08400534A GB 8400534 A GB8400534 A GB 8400534A GB 2133073 A GB2133073 A GB 2133073A
Authority
GB
United Kingdom
Prior art keywords
auxiliary
codeword
transmitter
receiver
codewords
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB08400534A
Other versions
GB8400534D0 (en
GB2133073B (en
Inventor
Frank Kleefeldt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kiekert AG
Original Assignee
Kiekert AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kiekert AG filed Critical Kiekert AG
Publication of GB8400534D0 publication Critical patent/GB8400534D0/en
Publication of GB2133073A publication Critical patent/GB2133073A/en
Application granted granted Critical
Publication of GB2133073B publication Critical patent/GB2133073B/en
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00182—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00182—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks
    • G07C2009/00238—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks the transmittted data signal containing a code which is changed
    • G07C2009/00253—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks the transmittted data signal containing a code which is changed dynamically, e.g. variable code - rolling code
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C2009/00753—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys
    • G07C2009/00769—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C2209/00—Indexing scheme relating to groups G07C9/00 - G07C9/38
    • G07C2209/06—Involving synchronization or resynchronization between transmitter and receiver; reordering of codes

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Lock And Its Accessories (AREA)
  • Selective Calling Equipment (AREA)

Abstract

The system has an electronic receiver/controller and a remote actuator/transmitter incorporating an encoder having a set of different codewords corresponding to the unlocking signal, sequenced in cyclic order (1,2,...x,...,n). At each actuation, one of these codewords is transmitted, in sequence, the x-th actuation transmitting the x-th codeword. The receiver has a decoder, which counts the transmissions and only converts the x-th transmission into the unlocking signal, releasing the electronic controller if it is the x-th codeword, these cycles continuing until x=n and then returning to x=1 and recommencing. If synchronism between the encoder and decoder is disturbed, it is restored by a signal from an auxiliary encoder having a set (m) of different, auxiliary, sequenced codewords acting as synchronisation signals. When the transmitter is specially actuated, one of these auxiliary codewords is transmitted, in sequence, the x-th actuation generating the x-th auxiliary codeword. An auxiliary decoder in the receiver counts the transmissions and converts the x-th auxiliary codeword on receipt into the unlocking signal, bringing about synchronisation and also switching the receiver to the (x+ 1)th auxiliary codeword (which the transmitter is prepared to emit), until at x=m the cycle recommences at 1.

Description

SPECIFICATION A central locking system for a motor vehicle This invention relates to a central locking system for a motor vehicle, having an electronic controller and a remote actuator, in which the remote actuator has at least one transmitter functioning as a key and a receiver functioning as a lock, the transmitter emits a signal, on actuation, which has the purpose-of releasing the centrally locked motor vehicle locks, and the receiver supplies one or more electrical pulses to the electronic controller of the central locking system. In order to prevent the unauthorised interception of signals passed between the transmitter and the receiver, and their direct use as picklock to release the central locking system, use is made of the means developed in data procesing technology for the securing and subsequent releasing of signals.To this end, the transmitter incorporates a coding device having a plurality (n) of different codewords corresponding to the unlocking signal in conformity with a prescribed code, the codewords being sequenced in cyclic order (1, 2,... x, ... n). Each time the transmitter is actuated, one of these codewords is transmitted, in sequence so that the x-th actuation transmits the x-th codeword. The receiver has a decoding device corresponding to the coding device, which counts the transmissions and only converts the x-th transmission into the unlocking signal, thereby releasing the electronic controller, if the codeword received is in fact the x-th codeword, these cycles continuing until x=n and then returning to x=1.
This system works provided synchronism is maintained between the coding device and the decoding device. It can be disturbed by incorrectly actuating the transmitter. Synchronism between the coding device and the decoding device can be re-established after failure by providing the transmitter with an additional auxiliary coding device, which when specially actuated generates auxiliary codewords not contained in the set (n) of different codewords, while the receiver has an auxiliary decoding device which converts an auxiliary codeword on receipt into the unlocking signal, provided that the decoding device previously set by the receipt of an x-th codeword has received a y-th codeword (x being different from y), this releasing process also resetting both the coding device and the decoding device to a common starting codeword in the counting cycle (1, 2, ... ..... n). The entire system has proved intrinsically sound, and makes it highly improbable in the mathematical sense that a picklock can be produced by intercepting and recording signals emitted by the key or transmitter.
However, the object of the invention is to further modify and improve the central locking system described above, so that it is even more difficult to produce an unauthorised picklock by recording signals passed between the transmitter and the receiver.
According to the present invention, therefore, the auxiliary coding device has a set (m) of different auxiliary codewords acting as synchronising signals in conformity with a prescribed auxiliary code and sequenced in cyclic order (1,2,... x, . . . n), special actuation of the transmitter generating one of these auxiliary codewords in sequence so that the x-th actuation generates the x-th auxiliary codeword, while the auxiliary decoding device counts the transmissions and, on the one hand, converts the received auxiliary codeword into the unlocking signal provided it is the x-th auxiliary codeword received at the x-th actuation, and on the other hand, having brought about synchronisation as already described, switches the receiver to respond to the (x+1 )th auxiliary codeword (which the transmitter is prepared to emit), and so on until afterx=m the cycle recommences at 1.
According to the invention, the auxiliary codeword in force is also taken from a set of codewords specially reserved for synchronisation and sequenced in cyclic order as described. This set (m) is traversed in steps, so that the synchronisation signal is additionally changed continuously. Each time the transmitter is specially actuated, the auxiliary codeword moves one forward. The receiver also moves one forward on receipt of an auxiliary codeword, provided it is that auxiliary codeword which it should next receive in the cyclic order. It is obvious that under the system of the invention the auxiliary coding device and the auxiliary decoding device must be synchronised.If synchronism should be lost, it is preferred under the invention for the receiver to switch back to a state of readiness to receive the first auxiliary codeword in the set after receiving at least one selected auxiliary codeword from the set (m), the transmitter being adapted to return to the same first auxiliary codeword after unusual special actuation, for example unusually long or frequent special actuation. The transmitter preferably has an attachment which reduces the output power and can be brought into use by specific special actuation, the output power being reduced to a sufficient extent to exclude any unobserved and unauthorised recording of the auxiliary codewords. The output power can be so low that the transmitter must as it were be pressed against the window of the motor vehicle equipped with the central locking system of the invention, assuming that the receiving antennae are mounted in the window concerned.
Claims
1. A central locking system for a motor vehicle having an electronic controller and a remote actuator, in which the remote actuator has at least one transmitter functioning as a key and a receiver functioning as a lock, the transmitter emits a signal, on actuation, which has the purpose of releasing the centrally locked motor vehicle locks, and the receiver supplies one or more electrical pulses to the electronic controller of the central locking system, the transmitter
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (3)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A central locking system for a motor vehicle This invention relates to a central locking system for a motor vehicle, having an electronic controller and a remote actuator, in which the remote actuator has at least one transmitter functioning as a key and a receiver functioning as a lock, the transmitter emits a signal, on actuation, which has the purpose-of releasing the centrally locked motor vehicle locks, and the receiver supplies one or more electrical pulses to the electronic controller of the central locking system. In order to prevent the unauthorised interception of signals passed between the transmitter and the receiver, and their direct use as picklock to release the central locking system, use is made of the means developed in data procesing technology for the securing and subsequent releasing of signals.To this end, the transmitter incorporates a coding device having a plurality (n) of different codewords corresponding to the unlocking signal in conformity with a prescribed code, the codewords being sequenced in cyclic order (1, 2,... x, ... n). Each time the transmitter is actuated, one of these codewords is transmitted, in sequence so that the x-th actuation transmits the x-th codeword. The receiver has a decoding device corresponding to the coding device, which counts the transmissions and only converts the x-th transmission into the unlocking signal, thereby releasing the electronic controller, if the codeword received is in fact the x-th codeword, these cycles continuing until x=n and then returning to x=1. This system works provided synchronism is maintained between the coding device and the decoding device. It can be disturbed by incorrectly actuating the transmitter. Synchronism between the coding device and the decoding device can be re-established after failure by providing the transmitter with an additional auxiliary coding device, which when specially actuated generates auxiliary codewords not contained in the set (n) of different codewords, while the receiver has an auxiliary decoding device which converts an auxiliary codeword on receipt into the unlocking signal, provided that the decoding device previously set by the receipt of an x-th codeword has received a y-th codeword (x being different from y), this releasing process also resetting both the coding device and the decoding device to a common starting codeword in the counting cycle (1, 2, ... ..... n). The entire system has proved intrinsically sound, and makes it highly improbable in the mathematical sense that a picklock can be produced by intercepting and recording signals emitted by the key or transmitter. However, the object of the invention is to further modify and improve the central locking system described above, so that it is even more difficult to produce an unauthorised picklock by recording signals passed between the transmitter and the receiver. According to the present invention, therefore, the auxiliary coding device has a set (m) of different auxiliary codewords acting as synchronising signals in conformity with a prescribed auxiliary code and sequenced in cyclic order (1,2,... x, . . . n), special actuation of the transmitter generating one of these auxiliary codewords in sequence so that the x-th actuation generates the x-th auxiliary codeword, while the auxiliary decoding device counts the transmissions and, on the one hand, converts the received auxiliary codeword into the unlocking signal provided it is the x-th auxiliary codeword received at the x-th actuation, and on the other hand, having brought about synchronisation as already described, switches the receiver to respond to the (x+1 )th auxiliary codeword (which the transmitter is prepared to emit), and so on until afterx=m the cycle recommences at 1. According to the invention, the auxiliary codeword in force is also taken from a set of codewords specially reserved for synchronisation and sequenced in cyclic order as described. This set (m) is traversed in steps, so that the synchronisation signal is additionally changed continuously. Each time the transmitter is specially actuated, the auxiliary codeword moves one forward. The receiver also moves one forward on receipt of an auxiliary codeword, provided it is that auxiliary codeword which it should next receive in the cyclic order. It is obvious that under the system of the invention the auxiliary coding device and the auxiliary decoding device must be synchronised.If synchronism should be lost, it is preferred under the invention for the receiver to switch back to a state of readiness to receive the first auxiliary codeword in the set after receiving at least one selected auxiliary codeword from the set (m), the transmitter being adapted to return to the same first auxiliary codeword after unusual special actuation, for example unusually long or frequent special actuation. The transmitter preferably has an attachment which reduces the output power and can be brought into use by specific special actuation, the output power being reduced to a sufficient extent to exclude any unobserved and unauthorised recording of the auxiliary codewords.The output power can be so low that the transmitter must as it were be pressed against the window of the motor vehicle equipped with the central locking system of the invention, assuming that the receiving antennae are mounted in the window concerned. Claims
1. A central locking system for a motor vehicle having an electronic controller and a remote actuator, in which the remote actuator has at least one transmitter functioning as a key and a receiver functioning as a lock, the transmitter emits a signal, on actuation, which has the purpose of releasing the centrally locked motor vehicle locks, and the receiver supplies one or more electrical pulses to the electronic controller of the central locking system, the transmitter incorporating a coding device having a plurality (n) of different codewords corresponding to the unlocking signal in conformity with a prescribed code and the codewords being sequenced in cyclic order (1,2,... x... n), so that each time the transmitter is actuated one of these codewords is transmitted in such a sequence that the x-th actuation transmits the x-th codeword, and the receiver having a decoding device corresponding to the coding device, which counts the transmissions and only converts the x-th transmission into the unlocking signal, thereby releasing the electronic controller, if the codeword received is in fact the x-th codeword, these cycles continuing until x=n and then returning to x=1, synchronism between the coding device and the decoding device being re-established after failure by providing the transmitter with an additional auxiliary coding device, which when specially actuated generates auxiliary code-words not contained in the set (n) of different codewords, while the receiver has an auxiliary decoding device which converts an auxiliary codeword on receipt into the unlocking signal, provided that the decoding device previously set by the receipt of an x-th codeword has received a y-th codeword (x being different from y), and finally this releasing process also resetting both the coding device and the decoding device to a common starting codeword in the counting cycle (1, 2,.. .... .
the auxiliary coding device having a set (m) of different auxiliary codewords acting as synchronising signals in conformity with a prescribed auxiliary code and sequenced in cyclic order (1, 2, . . . x, . . . n), special actuations of the transmitter generating one of these auxiliary codewords in sequence so that the x-th actuation generates the x-th auxiliary codeword, while the auxiliary decoding device counts the transmissions and, on the one hand, converts the received auxiliary codeword into the unlocking signal provided it is the x-th auxiliary codeword received at the x-th actuation, and on the other hand, having brought about synchronisation as already described, switches the receiver to respond to the (x+ 1 )th auxiliary codeword (which the transmitter is prepared to emit), and so on until afterx=m the cycle recommences at 1.
2. A central locking system as in Claim 1, wherein if synchronism is lost between the auxiliary coding device and the auxiliary decoding device, the receiver switches back to a state of readiness to receive the first auxiliary codeword in the set after receiving at least one selected auxiliary codeword from the set (m), the transmitter being adapted to return to the same first auxiliary codeword after unusual special actuation, for example unusually long or frequent special actuation.
3. A central locking system as in Claim 2, wherein the transmitter has an attachment which reduces the output power and can be brought into use by specific special actuation.
GB08400534A 1983-01-12 1984-01-10 A central locking system for a motor vehicle Expired GB2133073B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19833300732 DE3300732A1 (en) 1983-01-12 1983-01-12 CENTRAL LOCKING SYSTEM FOR A MOTOR VEHICLE

Publications (3)

Publication Number Publication Date
GB8400534D0 GB8400534D0 (en) 1984-02-15
GB2133073A true GB2133073A (en) 1984-07-18
GB2133073B GB2133073B (en) 1987-01-28

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GB08400534A Expired GB2133073B (en) 1983-01-12 1984-01-10 A central locking system for a motor vehicle

Country Status (6)

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JP (1) JPS59134285A (en)
DE (1) DE3300732A1 (en)
FR (1) FR2539176B1 (en)
GB (1) GB2133073B (en)
IT (1) IT1194481B (en)
SE (1) SE445570B (en)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0219060A2 (en) * 1985-10-11 1987-04-22 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Security device for an automotive vehicle
WO1987003403A1 (en) * 1985-11-21 1987-06-04 Australasian Electronic Sentry Pty. Limited Electro-magnetic lock
US4895009A (en) * 1987-11-05 1990-01-23 Kiekert Gmbh & Co. Kommanditgesellschaft Door-locking system for a motor vehicle
EP0459781A1 (en) * 1990-05-29 1991-12-04 Microchip Technology Inc. Method and Apparatus for Use in an Access Control System
EP0472419A1 (en) * 1990-08-23 1992-02-26 General Engineering (Netherlands) B.V. A retractor for a safety-belt
FR2695956A1 (en) * 1992-06-27 1994-03-25 Kiekert Gmbh Co Kg Central locking installation for a motor vehicle.
ES2070044A2 (en) * 1992-10-19 1995-05-16 Trw Sipea Spa Remote control especially for a vehicle
WO1998027300A1 (en) * 1996-12-16 1998-06-25 Ut Automotive Dearborn, Inc. Automatic resynchronization for remote keyless entry systems
US6049289A (en) * 1996-09-06 2000-04-11 Overhead Door Corporation Remote controlled garage door opening system
US6108326A (en) * 1997-05-08 2000-08-22 Microchip Technology Incorporated Microchips and remote control devices comprising same
US6166650A (en) * 1991-05-29 2000-12-26 Microchip Technology, Inc. Secure self learning system
US10652743B2 (en) 2017-12-21 2020-05-12 The Chamberlain Group, Inc. Security system for a moveable barrier operator
US10862924B2 (en) 2005-06-30 2020-12-08 The Chamberlain Group, Inc. Method and apparatus to facilitate message transmission and reception using different transmission characteristics
US10944559B2 (en) 2005-01-27 2021-03-09 The Chamberlain Group, Inc. Transmission of data including conversion of ternary data to binary data
US10997810B2 (en) 2019-05-16 2021-05-04 The Chamberlain Group, Inc. In-vehicle transmitter training
US11074773B1 (en) 2018-06-27 2021-07-27 The Chamberlain Group, Inc. Network-based control of movable barrier operators for autonomous vehicles
US11423717B2 (en) 2018-08-01 2022-08-23 The Chamberlain Group Llc Movable barrier operator and transmitter pairing over a network

Families Citing this family (12)

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Publication number Priority date Publication date Assignee Title
DE3442356A1 (en) * 1984-11-20 1986-05-28 Kiekert GmbH & Co KG, 5628 Heiligenhaus Central-locking system for a motor vehicle
DE3521570C2 (en) * 1985-06-15 1996-04-11 Kiekert Ag Central locking system for a motor vehicle equipped with a remote control device
DE3624707A1 (en) * 1985-07-22 1987-01-22 Aisin Seiki LOCK CONTROL DEVICE FOR VEHICLES
JP2534097B2 (en) * 1988-04-30 1996-09-11 株式会社アルファ Remote control lock control device
DE3840857A1 (en) * 1988-12-03 1990-06-07 Hella Kg Hueck & Co Device for the remote control of security devices
US6175312B1 (en) 1990-05-29 2001-01-16 Microchip Technology Incorporated Encoder and decoder microchips and remote control devices for secure unidirectional communication
JP2807100B2 (en) * 1991-05-13 1998-09-30 アルプス電気株式会社 Transceiver
DE4238858C1 (en) * 1992-08-22 1994-02-03 Kiekert Gmbh Co Kg Centralised locking system for motor vehicle - uses synchronised clock pulse counters in both coder and decoder set to same initial count via random number generator
DE4227887C1 (en) * 1992-08-22 1994-01-05 Kiekert Gmbh Co Kg Vehicle remote central door locking system - uses code-timing generators with synchronised code pulse counters in transmitter and receiver for variable code-word recognition.
JP2914211B2 (en) * 1995-03-24 1999-06-28 住友電装株式会社 Keyless entry system
US6690796B1 (en) 1995-05-17 2004-02-10 The Chamberlain Group, Inc. Rolling code security system
BR9606663A (en) 1995-05-17 1997-09-16 Chamberlain Group Inc Transmitter to send an encrypted signal to control a receiver actuator to receive an encrypted signal from a transmitter and to generate an actuation signal and receiver to receive an encrypted radio frequency signal from a transmitter and to generate an actuation signal

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Publication number Priority date Publication date Assignee Title
DE2824421C2 (en) * 1978-06-03 1985-10-10 Robert Bosch Gmbh, 7000 Stuttgart Switching arrangement for operating locking devices and similar safety devices, in particular as theft protection on a motor vehicle
DE7904797U1 (en) * 1979-02-21 1981-03-12 Apag Elektronik AG, Grabs, Sankt Gallen Motor vehicle with a safety device
US4236068A (en) * 1979-03-29 1980-11-25 Walton Charles A Personal identification and signaling system
US4353064A (en) * 1981-01-14 1982-10-05 Honeywell Inc. Battery operated access control card
DE3244049C2 (en) * 1982-11-27 1986-06-26 Kiekert GmbH & Co KG, 5628 Heiligenhaus Central locking system for a motor vehicle

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0219060A3 (en) * 1985-10-11 1988-08-24 Bayerische Motoren Werke Aktiengesellschaft Security device for an automotive vehicle
EP0219060A2 (en) * 1985-10-11 1987-04-22 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Security device for an automotive vehicle
WO1987003403A1 (en) * 1985-11-21 1987-06-04 Australasian Electronic Sentry Pty. Limited Electro-magnetic lock
US4895009A (en) * 1987-11-05 1990-01-23 Kiekert Gmbh & Co. Kommanditgesellschaft Door-locking system for a motor vehicle
US5517187A (en) * 1990-05-29 1996-05-14 Nanoteq (Pty) Limited Microchips and remote control devices comprising same
EP0459781A1 (en) * 1990-05-29 1991-12-04 Microchip Technology Inc. Method and Apparatus for Use in an Access Control System
EP0472419A1 (en) * 1990-08-23 1992-02-26 General Engineering (Netherlands) B.V. A retractor for a safety-belt
US6166650A (en) * 1991-05-29 2000-12-26 Microchip Technology, Inc. Secure self learning system
FR2695956A1 (en) * 1992-06-27 1994-03-25 Kiekert Gmbh Co Kg Central locking installation for a motor vehicle.
ES2070044A2 (en) * 1992-10-19 1995-05-16 Trw Sipea Spa Remote control especially for a vehicle
US6049289A (en) * 1996-09-06 2000-04-11 Overhead Door Corporation Remote controlled garage door opening system
US6667684B1 (en) 1996-09-06 2003-12-23 Overhead Door Corporation Remote controlled garage door opening system
WO1998027300A1 (en) * 1996-12-16 1998-06-25 Ut Automotive Dearborn, Inc. Automatic resynchronization for remote keyless entry systems
US6985472B2 (en) 1997-05-08 2006-01-10 Microchip Technology Incorporated Method of communication using an encoder microchip and a decoder microchip
US6108326A (en) * 1997-05-08 2000-08-22 Microchip Technology Incorporated Microchips and remote control devices comprising same
US11799648B2 (en) 2005-01-27 2023-10-24 The Chamberlain Group Llc Method and apparatus to facilitate transmission of an encrypted rolling code
US10944559B2 (en) 2005-01-27 2021-03-09 The Chamberlain Group, Inc. Transmission of data including conversion of ternary data to binary data
US10862924B2 (en) 2005-06-30 2020-12-08 The Chamberlain Group, Inc. Method and apparatus to facilitate message transmission and reception using different transmission characteristics
US11122430B2 (en) 2017-12-21 2021-09-14 The Chamberlain Group, Inc. Security system for a moveable barrier operator
US11778464B2 (en) 2017-12-21 2023-10-03 The Chamberlain Group Llc Security system for a moveable barrier operator
US10652743B2 (en) 2017-12-21 2020-05-12 The Chamberlain Group, Inc. Security system for a moveable barrier operator
US12108248B2 (en) 2017-12-21 2024-10-01 The Chamberlain Group Llc Security system for a moveable barrier operator
US11074773B1 (en) 2018-06-27 2021-07-27 The Chamberlain Group, Inc. Network-based control of movable barrier operators for autonomous vehicles
US11763616B1 (en) 2018-06-27 2023-09-19 The Chamberlain Group Llc Network-based control of movable barrier operators for autonomous vehicles
US12056971B1 (en) 2018-06-27 2024-08-06 The Chamberlain Group Llc. Network-based control of movable barrier operators for autonomous vehicles
US11423717B2 (en) 2018-08-01 2022-08-23 The Chamberlain Group Llc Movable barrier operator and transmitter pairing over a network
US11869289B2 (en) 2018-08-01 2024-01-09 The Chamberlain Group Llc Movable barrier operator and transmitter pairing over a network
US10997810B2 (en) 2019-05-16 2021-05-04 The Chamberlain Group, Inc. In-vehicle transmitter training
US11462067B2 (en) 2019-05-16 2022-10-04 The Chamberlain Group Llc In-vehicle transmitter training

Also Published As

Publication number Publication date
IT8323886A1 (en) 1985-05-25
IT1194481B (en) 1988-09-22
SE8306488L (en) 1984-07-13
IT8323886A0 (en) 1983-11-25
DE3300732C2 (en) 1987-09-03
GB8400534D0 (en) 1984-02-15
GB2133073B (en) 1987-01-28
SE8306488D0 (en) 1983-11-24
JPS59134285A (en) 1984-08-01
FR2539176A1 (en) 1984-07-13
SE445570B (en) 1986-06-30
DE3300732A1 (en) 1984-09-20
JPH0452350B2 (en) 1992-08-21
FR2539176B1 (en) 1986-12-26

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