Central locking installation for a motor vehicle
First Claim
1. A remote lock apparatus for a motor vehicle having at least one lock, comprising:
- a controller mounted to the vehicle for receiving a control pulse and connected to said lock for causing locking or unlocking of the lock;
a receiver mounted to the vehicle;
a remote actuating device having a transmitter;
means for switching said receiver from an operating mode to an initializing mode;
said transmitter transmitting a code word and a transmitter recognition signal to said receiver upon actuation of said transmitter;
said receiver transmitting said control pulse to said controller which cause the locking or unlocking of the lock;
said transmitter containing a random number generator producing said transmitter recognition signal during said initializing mode, and a transmitter store in which said transmitter recognition signal is stored, and a means for producing a supply of code words using a randomly modified mathematical formation law;
said receiver containing a memory and a receiver control circuit for comparing said transmitter recognition signal, during said initializing mode with preexisting transmitter recognition signals that are already stored within the memory, said control circuit automatically storing said transmitter recognition signal received from the transmitter as a legitimate transmitter recognition signal in said receiver memory only if not already so stored, and upon storing said transmitter recognition signal, said control circuit generating a new supply of code words, corresponding to said supply of code words produced by said means for producing a supply of code words at said transmitter, said new supply of code words assigned to said legitimate transmitter recognition signal; and
during said operating mode said receiver control circuit receives said legitimate transmitter recognition signal and the code word from said transmitter and if said transmitter recognition signal is already stored as a legitimate transmitter recognition signal said receiver control circuit compares the code word to a next expected code word from said new supply of code words assigned to said legitimate transmitter recognition signal and if correspondence exists, said receiver transmits said control pulse.
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Accused Products
Abstract
The invention relates to a central locking installation for a motor vehicle, having a transmitter (2), operating as a key, and a receiver (4), operating as a lock. When the transmitter (2) is actuated for the purpose of closing or opening the door locks, a signal (3) is transmitted to the receiver (4) and produces a control pulse (20) there. Each transmitter (2) has its own transmitter recognition signal and a stock of code words, from which the code words are taken in sequence and are transmitted. The receiver (4) carries out a transmitter allocation using the transmitter recognition signal. The invention is based on the object of the transmitter (2) seeking its transmitter recognition signal itself. This is achieved in that a transmitter recognition signal, which is stored in a transmitter store (12) and is transmitted together with a code word, is generated randomly in the transmitter (2). The receiver (4) has an evaluation circuit, by means of which the transmitter recognition signal is compared with transmitter recognition signals which are already stored and is stored as a legitimate transmitter recognition signal in a receiver store (18) if it is not already so stored.
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Citations
21 Claims
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1. A remote lock apparatus for a motor vehicle having at least one lock, comprising:
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a controller mounted to the vehicle for receiving a control pulse and connected to said lock for causing locking or unlocking of the lock; a receiver mounted to the vehicle; a remote actuating device having a transmitter; means for switching said receiver from an operating mode to an initializing mode; said transmitter transmitting a code word and a transmitter recognition signal to said receiver upon actuation of said transmitter; said receiver transmitting said control pulse to said controller which cause the locking or unlocking of the lock; said transmitter containing a random number generator producing said transmitter recognition signal during said initializing mode, and a transmitter store in which said transmitter recognition signal is stored, and a means for producing a supply of code words using a randomly modified mathematical formation law; said receiver containing a memory and a receiver control circuit for comparing said transmitter recognition signal, during said initializing mode with preexisting transmitter recognition signals that are already stored within the memory, said control circuit automatically storing said transmitter recognition signal received from the transmitter as a legitimate transmitter recognition signal in said receiver memory only if not already so stored, and upon storing said transmitter recognition signal, said control circuit generating a new supply of code words, corresponding to said supply of code words produced by said means for producing a supply of code words at said transmitter, said new supply of code words assigned to said legitimate transmitter recognition signal; and during said operating mode said receiver control circuit receives said legitimate transmitter recognition signal and the code word from said transmitter and if said transmitter recognition signal is already stored as a legitimate transmitter recognition signal said receiver control circuit compares the code word to a next expected code word from said new supply of code words assigned to said legitimate transmitter recognition signal and if correspondence exists, said receiver transmits said control pulse. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A remote lock apparatus for a motor vehicle having at least one lock, comprising:
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a controller means mounted to the vehicle for receiving a control pulse and causing locking or unlocking of the lock; a receiver mounted to the vehicle; a plurality of transmitters, separate from the vehicle each transmitter having transmitting means for transmitting a code word and a transmitter recognition signal to said receiver; said receiver having means for sending said control pulse to said controller means for causing the locking or unlocking of the lock; each said transmitter having means for randomly selecting a unique transmitter recognition signal during an initialization procedure, and a transmitter memory in which said transmitter recognition signal is stored; each said transmitter having a means for creating a unique randomly modified formation law during the initialization procedure and means for generating a sequence of code words according to the randomly modified formation law, and means for transmitting said randomly modified formation law to said receiver to be stored in memory assigned to said transmitter recognition signal for the respective transmitter; said receiver having means for recognizing a transmitter recognition signal transmitted by said transmitting means, and means for calculating an expected code word based on the modified formation law assigned to the respective transmitter recognition signal, and means for comparing the expected code word with a code word transmitted by the transmitter from the sequence of code words, whereby a correct correlation therebetween results in said means for sending said control pulse to issue said control pulse to said controller means. - View Dependent Claims (18, 19, 20)
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21. A method of initializing a central locking system comprising the steps of:
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given an authorized initialization, generating a new transmitter identifier by a random number generator, and storing this new transmitter identifier in a memory of the transmitter; transmitting the new transmitter identifier and a random word from the transmitter to the receiver, forming a group of code words defined by a mathematical formation low modified the random word; during the initialization, comparing the new transmitter identifier in the receiver to pre-existing transmitter identifiers already stored, and automatically storing the new transmitter identifier in a memory of the receiver when this new transmitter identifier has previously not been stored; displaying a successfully implemented initialization to the user by a display element; and generating the group code words also in the receiver by said mathematical formation law modified by the random word.
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Specification