Electronic locking apparatus for motor vehicles
First Claim
1. An electronic locking apparatus, particularly for motor vehicles, havingan electrical lock;
- at least one positioning means connected to and actuated by the lock;
at least one electrical key;
means in each of said key and said lock for generating a code signal;
means in the key for transmitting a code signal to the lock;
means in said lock for comparing respective code signals generated by said key and by said lock; and
means responsive to said comparing means for actuating said positioning means;
whereina continuously operating oscillator (11,21) is provided in each of said key and said lock, said oscillators being synchronized with one another;
a number sequence generator, connected to an output of said oscillator, is provided in each of said key and said lock;
said number sequence generators cyclically stepping through identical predetermined sequences of numbers, in synchrony with one another;
a computer, having at least one input, is provided in each of said key and said lock;
each number sequence generator has a time-varying count which is applied to said input of a respective computer;
a fixed memory, containing a code number characteristic of each key-and-lock pair, is provided in each of said key and said lock;
said fixed memory supplies said code number to a respective computer;
said computers contain identical algorithms and each use said algorithm to combine said time-varying count and said code number into a combination code, said combination code being transmitted as a signal between said key and said lock;
a re-try stage is provided in said lock which, upon failure to match respective codes derived from said key and said lock, selects numbers, in said predetermined sequence of numbers, lying above and below said count and directs the computer in said lock to sequentially produce further combination codes and attempt to match them with combination codes derived from said key;
upon successful matching of combination codes derived respectively from said key and said lock, one of said number sequence generators adjusts its count to agree with the count of the other of said number sequence generators.
1 Assignment
0 Petitions
Accused Products
Abstract
A simple and economical, yet tamper-proof, electronic locking apparatus for motor vehicles features an electronic key and an electronic lock, which each contain a synchronized, constantly operating, precision oscillator. The output of each oscillator is applied at a predetermined counting rate to a respective number sequence generator. Both generators contain the same predetermined number sequence, which they step through at the same clock rate, applying the instantaneous value of the count to a first input of a respective computer. A second input of each computer is connected to a fixed memory which supplies a permanent, characteristic code number to the computer. Both the count state and the characteristic code number are combined using corresponding algorithms in the key and in the lock to produce a combination code. The key-produced combination code is sent from a transmitter in the key to a receiver in the lock and compared there with the lock-produced combination code. In the event of a successful comparison, a control pulse is generated, which actuates various positioning means in the lock.
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Citations
12 Claims
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1. An electronic locking apparatus, particularly for motor vehicles, having
an electrical lock; -
at least one positioning means connected to and actuated by the lock; at least one electrical key; means in each of said key and said lock for generating a code signal; means in the key for transmitting a code signal to the lock; means in said lock for comparing respective code signals generated by said key and by said lock; and means responsive to said comparing means for actuating said positioning means; wherein a continuously operating oscillator (11,21) is provided in each of said key and said lock, said oscillators being synchronized with one another; a number sequence generator, connected to an output of said oscillator, is provided in each of said key and said lock; said number sequence generators cyclically stepping through identical predetermined sequences of numbers, in synchrony with one another; a computer, having at least one input, is provided in each of said key and said lock; each number sequence generator has a time-varying count which is applied to said input of a respective computer; a fixed memory, containing a code number characteristic of each key-and-lock pair, is provided in each of said key and said lock; said fixed memory supplies said code number to a respective computer; said computers contain identical algorithms and each use said algorithm to combine said time-varying count and said code number into a combination code, said combination code being transmitted as a signal between said key and said lock; a re-try stage is provided in said lock which, upon failure to match respective codes derived from said key and said lock, selects numbers, in said predetermined sequence of numbers, lying above and below said count and directs the computer in said lock to sequentially produce further combination codes and attempt to match them with combination codes derived from said key; upon successful matching of combination codes derived respectively from said key and said lock, one of said number sequence generators adjusts its count to agree with the count of the other of said number sequence generators. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An electronic locking apparatus, particularly for motor vehicles, having an electrical lock;
- at least one positioning means connected to and actuated by the lock;
at least one electrical key;
means in each of said key and said lock for generating a code signal;
means in the key for transmitting a code signal to the lock;
means in said lock for comparing and matching respective code signals generated by said key and by said lock; and
means responsive to said comparing and matching means for actuating said positioning means, wherein a continuously operating oscillator is provided in each of said key and said lock, a number sequence generator, connected to an output of said oscillator, is provided in each of said key and said lock, said number sequence generators cyclically stepping through identical predetermined sequences of numbers, in synchrony with one another, a computer, having at least one input, is provided in each of said key and said lock, and a re-try stage is provided in said lock which, upon failure to match respective codes derived from said key and said lock, selects numbers, in said predetermined sequence of numbers, lying above and below said count and directs the computer in said lock to sequentially produce further combination codes and attempt to match them with combination codes derived from said key.
- at least one positioning means connected to and actuated by the lock;
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12. An electronic locking apparatus, particularly for motor vehicles, having an electrical lock;
- at least one positioning means connected to and actuated by the lock;
at least one electrical key;
means in each of said key and said lock for generating a code signal;
means in the key for transmitting a code signal to the lock;
means in said lock for comparing and matching respective code signals generated by said key and by said lock; and
means responsive to said comparing and matching means for actuating said positioning means, wherein a continuously operating oscillator is provided in each of said key and said lock, a number sequence generator, connected to an output of said oscillator is provided in each of said key and said lock, said oscillators being synchronized with another, and for complete re-synchronization of said lock, a mechanical key and a mechanical key receiving element, connected to components of said lock, are provided, a decoder is provided in said lock for deriving from the signal received from said electrical key the count in the number sequence generator of said electrical key and, upon actuation of said key receiving element by said mechanical key, said decoder is connected to receive said signal from said electrical key and to inputs of each number sequence generator in said lock to reset the count in each generator to agree with the count in the generator in said electrical key.
- at least one positioning means connected to and actuated by the lock;
Specification