KR100591471B1 - Motor vehicle locking system with open-ended code and identification - Google Patents

Abstract

The present invention relates to a locking system of a motor vehicle, which is a lock / unlock control device (10) and identification of an automobile door having an opening code composed of a first basic keyword (Cb) and a second pseudorandom number keyword (Ni). One or more keys 30 co-operating with the device 20, wherein resynchronization of the opening code between the keys and the control device receives that the lock / unlock code of the car door does not correspond to the expected code. The control device stores the received code and updates the second keyword image based on the received code when the identification device confirms the approval identification of the key.

Description

Car lock system with opening code and identification code {MOTOR VEHICLE LOCKING SYSTEM WITH OPEN-ENDED CODE AND IDENTIFICATION}

TECHNICAL FIELD The present invention relates to a locking system for an automobile door, and more particularly, to a system including remote control of an open-ended code necessary for resynchronization between a transmitter and a receiver.

In the prior art, such as US Pat. No. 4,825,210, remote control locking systems using open codes are well known. In such a system, desynchronization between a sequence of codes transmitted by a transmitter and a sequence of expected codes by a receiver is a major problem. In the above-mentioned US patent document, to solve this problem, it is proposed to compare a first list of received codes with a first list of codes represented by an acquisition sequence, and immediately unlock the door if the received codes correspond to the list. It is. If the received code does not correspond to the above first list, compare it with the extended list indicated by the synchronization sequence, wait for reception of the second code, immediately confirm the unlock authorization, and receive the receiver on the transmitter sequence. Perform a sequence to resynchronize. Such a system is satisfactory when desynchronization is derived by repeatedly pressing the touch of the remote control outside the vehicle's reception range, but inconvenient when desynchronization results from replacing the batteries of the remote control. In fact, in the case of battery replacement, as long as the synchronization sequence does not cover all of the possible sets of codes, the sequence of transmitted codes can resume from any random number in the sequence of possible codes, and have a common code with the synchronization sequence. I can't. In addition, if the synchronization sequence covers all of the possible sets of codes, not only is there a cost to memory location and computation time, but it also becomes impossible to use with codes containing billions of possible combinations.

Therefore, it is an object of the present invention to propose a system capable of reliable resynchronization between a transmitter and a receiver, regardless of the cause of the desynchronization.

To this end, it is possible to obtain the advantage that an identification responder called a transponder used by a vehicle immobilization device as described in, for example, British Patent No. 2,051,442 or US Patent No. 4,738,334 coexists with a transmitter key of the aforementioned remote control. have.
For example, French Patent No. 2,738,587 or European Patent No. 0,711,892 discloses a method of synchronizing keys by recognition of transponders, mechanical communication using locks, to enable such synchronization. On the other hand, this method requires spontaneous operation on behalf of the user who must press the remote control (remote) button at the right moment (French Patent No. 2,738,587), or requires systematic reprogramming of identically formed code without desynchronization. One (European Patent No. 0,711,892), which corresponds to an expensive and risky operation. Other methods (German Patent No. 195 33 191) must use a diagnostic tool for operating the receiver in programming mode to synchronize with the remote control transmitter, which requires the work of a mechanic.
Thus, the present invention seeks to provide a system capable of reliable resynchronization between a transmitter and a receiver, which is economical, safe and clear to the user.

The object of the present invention is achieved by using an automotive locking system as is apparent from the specification of the present invention, which locking system receives a lock / unlock code of the car door and locks if the received code corresponds to the expected code. A lock / unlock control device for an automobile door, the code being an open code consisting of a first basic keyword and a second pseudo-random keyword; Identification device; One or more keys including a remote control transmitter to transmit the lock / unlock code of the car door to a control device of the car door, and an identification reactor to transmit an identification code of the key in response to a request of the identification device.

According to the present invention, when it is received that the lock / unlock code of the car door does not correspond to the expected code, the control device stores the received code, and based on the received code when the identification device confirms the approval identification of the key. To update the second keyword image.

According to an important feature of the invention, the update is performed only if confirmation of the authorization identification of the key occurs after receipt of the lock / unlock code within a preset period of time.

According to a first variant of the invention, the control device calculates the second keyword image by a partial inverse function from the received code on the basis of the first basic keyword.

According to a second variant of the invention, the control device determines the second keyword image by examining the list of codes formed from the basic keywords and the codes received in the sequence of possible second keywords.

The lock / unlock code includes a public identification heading of a key that is different from the identification code, and only if the heading corresponds to a heading of an approved key, the control device remembers the received code.

Other features and advantages of the system according to the present invention will become apparent from the present specification with reference to the accompanying drawings below.

1 shows a schematic diagram of system operation in accordance with the present invention.

2 shows the format of the transmitted code.

Referring to FIG. 1, the control device 10 for locking / unlocking a car door is typically a remote control receiver, a code reader for comparing a received code with an expected code, and the control of a motor or operator adjusting the lock of the car door. Means; Such means are also known in the prior art and will not be described any further and are not explicitly shown in the drawings. In addition, the vehicle 1 is equipped with an identification device 20 formed from an automobile passivation device. Such a control apparatus 10 and the identification apparatus 20 are connected by the communication booth B between them.

Also shown in FIG. 1 is a remote control transmitter 31, supplied by a battery 34 and controlled by a breaker 33, and a key 30 equipped with an identification reactor 32.

Now, the operation of the locking system of the present invention will be described. To unlock the car door, the user presses the breaker 33, which introduces a remote control transmitter 31 which transmits the unlock code Ci in place of the lock control device 10. Such transmission may be performed by electromagnetic intermediate waves of radio waves, or by infrared radiation. The released cord Ci is open, in other words, the following codes are different from each other. This is normally performed by a code combining the first basic keyword Cb and the second pseudo random number keyword Ni by the algorithm f. In general, from the number of presses formed on the breaker 33 after the initialization step in which the control device 10 and the remote control transmitter 31 are programmed with the same value N ₀ and the same basic keyword Cb as the second keyword. The second keyword described above is generated. This number is regularly increased from each press on the key breaker 33 and with each reception of the code Ci for the control device 10. While the control device 10 receives the unlock code Ci, the control device obtains the same algorithm f from the basic keyword Cb and the actual image N'i of the second keyword held by the control device. Compare the received code with the expected code. If the received code corresponds to the expected code, the car door is unlocked.

On the other hand, as described in the preamble, for example during the replacement of the battery 34, the image of the second keyword held by the remote control transmitter 31 can be modified, and the transmitted code Ci is no longer present. It may not correspond to the expected code by the control device 10.

According to the present invention, in this case, the control device 10 stores the received unlock code Ci but does not control the unlock of the door. Thus, the user mechanically unlocks the car door by means of the mechanical part of the key, and inserts the key into the connecting piston barrel of the car to start the car. This operation initiates the identification process of the key by the identification device 20 as is well known. The identification device 20 transmits the identification request by means of a buckle of the requested magnetic coupling while the identification reactor 32 disposed in the key reacts while adjusting the magnetic field transmitted by the identification code Xp. This identification code is compared with a reference code programmed in the identification device 20 to authorize starting of the vehicle during the communication. In this case, according to the present invention, the identification device 20 transmits a confirmation to the lock control device that the key is an approved key by intermediation of the booth B. FIG. If the identification confirmation of the key 30 is received as approved, the control device 10 will use the received unlock code Ci, and store it in order to update the image Ni of the second keyword. .

According to a first variant of the invention, this update is performed by calculating the second keyword value of the key from the received code Ci and the basic keyword Cb. To this end, the coding algorithm f of the code must be at least partially an inverse function. In other words, if Ci and Cb are known, there must be an algorithm f _N ^-1 that can obtain the value of Ni. Such algorithms are well known to those skilled in the art and should hardly compromise the security of the system, which means that if only the basic keyword (Cb) is known, the second keyword (Ni) can be found. Except for the initialization phase, it never changes between the key and the car.

As a simple example, one could propose a coding algorithm f of type Ci = Cb XOR Ni, where the function XOR is an Exclusive-OR written in binary words of Cb and Ni. In this case, the inverse function algorithm f _N ^-1 becomes Ni = Cb XOR Ci.

According to a second variant of the invention, the update of the second keyword is made possible by the encoding algorithm f from the possible sequence of the second keyword Ni and the basic keyword Cb, similarly to the prior art. This can be done by examining the code Ci received in the list of codes. In fact, unlike the prior art, which had to set a list of possible codes in advance, in the case of the present invention, the value investigation of Ni, which can obtain the received code Ci only when the key is identified as being approved, is performed, It significantly reduces the memory location and computation time required after the user enters the vehicle. It is also possible to use a more modified method, for example, investigation of the code by the expected code (since desynchronization is associated with numerous pressures outside the reach of control device 10) At the time of exchange, the code is searched to obtain the possible values of the second keyword when placed at zero.

The locking system of the present invention can be improved by performing certain supplementary checks prior to approval of the update of the second keyword by the control device 10. In addition, if the authorized user appears after a slight delay by introducing a maximum time between receipt of an unknown code Ci and confirmation of the identification of the key, a code sent from the location of another adjacent vehicle initiates the update process. Do not disturb the operation of the machine. Similarly, as shown in FIG. 2, the unlock code Ci may comprise a public identification heading ID of the key, for example corresponding to the serial number of the key. The list of approved keys can be stored inside the control device 10, which responds only if the received code Ci contains a heading ID corresponding to the keys in the list. This identification heading stored in the nonvolatile memory of the remote control transmitter 31 is not affected by the substantial initialization upon replacement in the battery. Of course, this is also different from the identification code Xp from the secretly registered identification responder.

The aforementioned locking system is not limited by the resynchronization technique described. It is desirable to use it with the spontaneous resynchronization technique described in the preamble when this is satisfied, and maintains the characteristics combined with the memoryization of the unknown unlock code by the control of the locking device 10, and voluntary resynchronization In certain cases where synchronization is lost (e.g., when the battery is replaced), the identification device 20 will perform an authorization identification of the key.

Claims (5)

a) the control device 10 for locking / unlocking the car door that receives the lock / unlock code Ci of the car door and controls the unlocking if the received code corresponds to the expected code Cj; Wherein the code Ci is an open code consisting of a first basic keyword Cb and a second pseudo random number keyword Ni); b) identification device 20; And c) the remote control transmitter 31 for transmitting the lock / unlock code Ci of the car door to the control device of the car door, and the identification for sending the identification code Xp of the key in response to a request of the identification device. An automotive locking system comprising at least one key 30 comprising a reactor 32, The control device Storage means for storing the received code if it is received that the lock / unlock code of the car door does not correspond to the expected code and Updating means for performing an update of the second keyword image based on the received code when the identification device confirms the approval identification of the key; Automotive locking system comprising a. 2. The vehicle locking system according to claim 1, wherein the updating means performs the update only when the confirmation of the approval identification of the key is performed within a preset time after receipt of the lock / unlock code. 2. The motor vehicle according to claim 1, wherein the control device calculates the image Ni of the second keyword by the inverse function, in part, from the received code Ci on the basis of the first basic keyword Cb. Lock system. The method of claim 1, wherein the control device determines the second keyword image Ni by examining the received code Ci in the code list generated from the sequence of possible second keywords and the basic keyword. Automotive locking system. The lock / unlock code of claim 1 comprises a public identification heading (ID) of a key different from the identification code (Xp), and the storage means is only received if the heading corresponds to a heading of an approved key. A lock system for a vehicle, characterized in that it stores the code.

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