FR2738587A1 - Operation of lock for car using remote control device - Google Patents

Abstract

The procedure for operating a lock involves inserting the key into a complementary switch after the energy store in the remote control device has been exchanged. During operation of the key, the transponder/interrogation/receiver (16) is activated. The transponder exchange code word in the store of the transponder is retrieved from it. After a comparison of the retrieved and received exchange code word with the exchange code word stored in the transceiver, a time switch is activated which opens a synchronisation time window, preferably in the receiver (7). Upon operation of the transmitter within this time window, the transmitted remote control exchange code word is stored in the receiver, replacing its predecessor.

Description

METHOD FOR CONTROLLING A CLOSURE DEVICE FOR A
MOTOR VEHICLE. PROVIDED WITH A CONTROL SYSTEM
DISTANCE AS WELL AS A TRANSPONDER
The invention relates to a method for controlling a locking device for a motor vehicle equipped with a central locking system. The invention starts from a locking device which is not part of the current state of the art and comprises a remote control system for the central locking system, said remote control system comprising a transmitter with a device for coding, an energy accumulator and a key as well as a receiver in the motor vehicle with a decoding device complementary to the coding device, the actuation of the transmitter making it possible to generate a code word for change of remote control and transmitting it as a remote control change code signal, said remote control change code word being receivable by the receiver, and an unlock signal for the central locking system being produced in the device decoding based on a comparison of the received remote control change code signal with the control change code word distance stored in the decoding device. This closing device is characterized in that the remote control device has, in addition, a transponder with a memory of transponder code words, that the motor vehicle comprises at least one transmitter-receiver of transponder interrogation with a memory of transceiver code words, that the motor vehicle is equipped with at least one key switch complementary to the key and making it possible to activate the transponder interrogation transceiver, the transponder interrogation transceiver is connected to a receiver to form a transponder change code word from the remote control change code word, and the transponder interrogation transceiver allows, based on a comparison of the transponder change code signal called and received with the transponder change code word eur stored in the transceiver code word memory, to form the unlocking signal when the transmitter is not in working order and / or a service signal for switching on at least one set of operation of the vehicle, then form, from the remote control change code word, a new transponder change code word, and store it in the transceiver code word memory as well as in the transponder code word memory.

 The closing device described above operates in normal service so that the transmitter is actuated, which has the effect that the remote control change code word is generated in the transmitter and transmitted as a code word signal. remote control change. The remote control change code word signal is received by the receiver, and in the decoding device, an unlock signal for the central locking system is produced based on a comparison of the code word signal remote control change received with the remote control change code word stored in the decoding device. The remote control change code word is then changed from time to time in a basically synchronous manner in the transmitter and in the receiver.

This can be done in a variety of ways. In the simplest case, one can work with a limited number of code words, with from time to time a synchronous switching from one code word to the next and from the last code word to the first. Similarly, you can work with the system time (see also DE -A42 27 887, DE -A42 38 858). If necessary, it is possible to provide for slight deviations from the synchronism, a tolerance window. In the case of a transmitter out of service, for example following the exhaustion of the energy accumulator, the key is inserted in the key switch and the transponder interrogation transceiver is activated. The transponder interrogation transceiver connected to the receiver for forming a transponder change code word, then interrogates the transponder and compares the received transponder change code word signal with the code word change of transponder stored in transceiver code word memory. If the comparison result is positive, i.e. the key and the transponder respectively are recognized as valid, an unlock signal is produced. Next, a new transponder change code word is formed from the remote control change code word stored in the receiver upon activation of the transponder interrogation transceiver, and stored in the transponder code word memory as well as in the transceiver code word memory.

On this point, all this has given good results.

 The measures described have given good results, but it is desirable that, after a change of energy accumulator, synchronism can be restored in the transmitter also with regard to the code word for change of remote control.

 The object of the invention is therefore to indicate a method for controlling a closing device of the aforementioned type which makes it possible, after a change of the energy accumulator, to restore in a simple manner the synchronism between the words of remote control change code stored in the transmitter and in the receiver.

 According to the invention, this object is achieved by the fact that, after replacing the energy accumulator of the remote control system, the key is inserted into the complementary key switch, that the transceiver of transponder interrogation is activated by actuation of the key entered, which the activated transponder interrogation transceiver calls in the transponder the transponder change code word stored in the transponder code word memory of the transponder mounted in the remote control system, only as a function of a comparison of the transponder change code word called and received with the transponder change code word stored in the transceiver code word memory , a timing circuit opening a synchronization time window and preferably arranged in the receiver is activated, and that when the transmitter is actuated inside the at the synchronization time window, the remote control change code word then transmitted by the transmitter is stored in the receiver in replacement of the remote control change code word previously stored in the receiver. - In other words, a positive comparison of the code word for changing the transponder allows not only the unlocking and respectively the locking of the central locking system, but also the opening of a time window inside which the relative synchronism at the remote control change code word in the receiver as well as in the transmitter is restored by the sole actuation of the transmitter. It goes without saying that, after synchronization, the remote control change code word in the transmitter as well as in the receiver is advanced in the usual manner. In total, after a change of the energy accumulator, the operating order of the closing device can easily be restored by an operator. A new programming in the workshop is not necessary.

In principle, synchronization can be carried out independently of the operating state and respectively of an actuation of the central locking system. An embodiment of the invention to which preference has been given, is however characterized in that the remote control change code word emitted by the transmitter inside the open synchronization time window does not is memorized in the receiver only when the central locking system is in the locked operating position. In detail,
Activation of the transponder interrogation transceiver can be accomplished by depressing or turning the key in the key switch.

 The following description, with reference to the accompanying drawings by way of non-limiting examples, will make it possible to understand clearly how the invention can be put into practice.

Figure 1 shows an overview of a motor vehicle with a closing device;
FIG. 2 represents a detailed view of a remote control device, and
Figure 3 shows a detailed view of a key switch.

 In fig. 1, we first notice a motor vehicle 1 which is equipped with a central locking system. Within the framework of said central locking system, motor vehicle door closers 2 with central locking controls are arranged on the doors as well as on the cover of the luggage compartment of the motor vehicle 1. In the motor vehicle 1 is housed a receiver 7 which is part of a remote control device 3. The remote control device 3 also includes a transmitter 4 shown in FIG. 2 and comprising a coding device 5, an energy accumulator 6 and a key 12. The receiver 7 is equipped with a decoding device 8 complementary to the coding device 5. The actuation of the transmitter 4 by means of the switch 18 produces a remote control change code word and transmits it as a remote control change code signal via the infrared light emitting diode 19. The control change code signal remotely can be received by the receiver 7 via the infrared detector 20. The remote control device 3 additionally comprises a transponder 9 with a transponder code word memory 10. In a similar manner, a transmitter transponder interrogation receiver 16 provided with a memory of transceiver code words 11 is arranged in the motor vehicle.

Furthermore, the motor vehicle 1 comprises key switches 13, 13 ′ complementary to the key 12. A key switch 13 is then accessible from outside the motor vehicle 1, while the other key switch 13 ′ is provided as part of an ordinary contact lock. The two key switches 13, 13 ′ activate the transponder interrogation transceiver 16. As shown in FIG. 2, the transponder 9 is not connected to the energy accumulator 6 produced in the form of a battery. The transponder is supplied with electrical energy by antennas 17, 17 ′ of the transceiver transponder interrogation 16 provided in the key switches 13, 13 'or near said key switches 13, 13' and allowing wireless electrical energy to be transmitted to the antenna 15 of the transponder and therefore to the transponder 9.

In principle, it is however also possible to supply the transponder 9 with electrical energy by means of corresponding contacts on the key 12 and the key switches 13, 13 ′. Furthermore, the transponder 9 includes a modulator / demodulator 21. The corresponding components of the transponder interrogation transceiver have been omitted for clarity. In fig. 3, the details of a key switch 13, 13 ′ are recognized.

When the locking cylinder is rotated by means of a suitable key, the switch 22, 22 'is actuated. The switch 22, 22 'activates the transponder interrogation transceiver 16 which in turn transmits, via the antenna 17, 17', electromagnetic waves for interrogation of the transponder as well as for the power supply in transponder energy.

Below, the operation of the closure device according to the embodiment is explained in detail. In the coding device 5 and the decoding device 8, synchronization pulses with a selectable frequency of code cycles can be produced, independently of their actuation by the transmitter 4, by means of respectively a functioning code timer continuously provided in the coding device 5 and the decoding device 8. The code synchronization pulses are counted each time continuously, as digital increments, in a code synchronization pulse counter in the device coding device 5 and the decoding device 8. The momentary state (m) of the code synchronization pulse counter in the coding device at the time of actuation of the transmitter 4 then forms part of the word remote control change code. In the decoding device can be produced an unlocking signal for
Actuation of the central locking system on the condition that, at the moment of reception of the remote control change code signal, a state (m ′) of the synchronization pulse counter in the decoding device 8 agrees with the state (m) of the code synchronization pulse counter in the coding device 5 at the time of actuation of the transmitter 4 or that it does not deviate from it by more than a numerical value of divergence (c) chosen in advance. The numerical value of divergence (c) can then be variable, for example it can increase with the time elapsed since the last actuation of the remote control device 3. If, after actuation of the transmitter 4, an upward deviation of the digital value of divergence (c) is detected, no unlocking signal is produced. Such a deviation, too large, may on the one hand be due to a fault inside the transmitter 4 but on the other hand be caused by an unauthorized opening attempt by means of a foreign remote control device 3. However, to allow the vehicle to be unlocked in the event of a fault with the transmitter, the key 12 is inserted into the key switch 13 and turned. As a result, the switch 22 is actuated and the transponder interrogation transceiver is activated. The transponder interrogation transceiver 15 then transmits a trigger code word. If the transmitted trigger code word matches the trigger code word stored in the transponder 9, the transponder in turn transmits the code signal transponder change (if there is no match for the trigger code word, the process is interrupted). The transponder interrogation transceiver compares the received transponder change code word with the transponder change code word stored in the transceiver code word memory. If there is no agreement, the process is interrupted. However, if there is a match, an unlock signal is produced and the central locking system is unlocked. Immediately thereafter, the momentary remote control change code word is transmitted from the receiver 7 to the transponder interrogation transceiver 16 and stored in the code word memory of the transceiver 11. L the transponder interrogation transceiver then sends the now valid transponder change code word to the transponder where it is stored in the transponder code word memory.

 If the energy accumulator 6 of the remote control device 3 has been replaced, a timing circuit opening a synchronization time window, not shown and preferably arranged in the receiver 7, is additionally activated, depending on the described comparison between the transponder change code word received and the transponder change code word stored in the transceiver code word memory. However, the timing circuit can also be provided in the transponder interrogation transceiver 16 or a central control device or else be arranged in the program. If the transmitter 4 is actuated by means of the switch 18 inside of the open time window, the remote control change code word transmitted with the actuation is memorized in the receiver in replacement of the remote control change code word previously stored in the receiver 7. In the example As an embodiment, the remote control change code word transmitted by the transmitter 4 inside the open synchronization window is however only stored in the receiver 7 if the central locking system is in the locked operating position.

 To start the motor vehicle 1, the key 12 is inserted and turned in the key switch 13 'arranged in the framework of an ordinary contact lock. This causes the switch 22 'to be actuated. Then, the triggered processes are substantially the same as in the case of actuation of the key switch 13 accessible from the outside. These are the following operations: Activation of the transponder interrogation transceiver 16, transmission of the trigger code word by the transponder interrogation transceiver 16.

reception of the trigger code word by the transponder 9.

comparison of the trigger code word received with the trigger code word stored in the transponder, if there is a match.

transmission of the transponder change code word signal by the transponder 9, comparison of the transponder change code word received by the transponder interrogation transceiver 16 with the transponder change code word stored in the transceiver code word memory, in the event of a match, production of the operating signal for starting the operating unit or sets 14 of the motor vehicle 1, transmission of the change code word momentary remote control by the receiver 7 to the transponder interrogation transceiver 16 and memorization in the memory of transceiver code words, with the formation of a new transponder change code word, transmission of the new transponder change code word by means of the transponder interrogation transceiver 16 and memorization of the new transponder change code word received by the tra nsponder 9, in the memory of transponder code words 10. It goes without saying that here also the mismatch of the trigger code word and / or the transponder change code word prohibits starting the motor vehicle. 1.

 With regard to the functions, it is possible to provide other complementary functions. Thus, for example, the transponder 9 can be connected, in addition, to the transmitter 4, preferably by means of a serial interface. Via the serial interface, one or more additional code words can be transmitted to the transponder code word memory 10. These code words can be called with the transponder interrogation transceiver 16 and compared. with additional code words suitably stored in the transceiver code word memory 11. It is advantageous that the additional code word is an auxiliary transponder change code word which can be changed by regular transmission of the momentary state (m) of the code synchronization pulse counter in the coding device 5 in the memory of transponder code words 11. It therefore goes without saying that a corresponding modification of the code word of change of auxiliary transponder in the transceiver code word memory 11 is effected by the transmission of the momentary state (m ') of the code synchronization pulse counter in the decoding device 8 to said memory. By regular transmission is meant transmissions made respectively after predetermined time intervals. The frequency of transmissions may be different from the frequency of code cycles. In detail, the following additional functions take place in the time interval between the comparison of the trigger code word and the transmission of the transponder change code word signal by the transponder 9.

In the event of a match with regard to the trigger code word, the transponder 9 transmits the auxiliary transponder change code word modified regularly by the transmitter 4 via the serial interface, to the transmitter- transponder interrogation receiver 16 and the received auxiliary transponder change code word is compared in the transponder interrogation transceiver 16 with the auxiliary transponder change code word stored in the code word memory transceiver 11 and modified with a corresponding regularity by the receiver 7. In the event of a match, there is an unlocking (and respectively a switching on) and the transmission of the code word for changing the auxiliary transponder and respectively the code word of change of remote control momentary at the moment of unlocking (and respectively of switching on) in the memory of cod words e of transceiver 11 and, consequently, in the memory of transponder code words 10. If there is no match, the transponder interrogation transceiver 16 sends to the transponder 9 an auxiliary trigger code word which is then compared with the auxiliary trigger code word stored in the transponder code word memory 10. If matched, the transponder transmits the transponder change code word as the change code word signal transponder, etc., and finally it is again the auxiliary transponder change code word or the temporarily valid remote control change code word, which is transmitted as current transponder change code word to the memory of transceiver code words 11 and to transponder code word memory 10. The serial interface can also be used to transmit to transponder code word memory date 10 of the operating status data. This data can then also be called up by means of the transponder interrogation transceiver 16.

 All the exemplary embodiments basically have the common point that with each activation of the transponder interrogation transceiver 16 which leads to the production of an unlocking signal or an operating signal, the word respectively valid transponder change code is somehow consumed and replaced by a new transponder change code word formed from the remote control change code word (and respectively from the auxiliary transponder change code word) valid at the time of actuation. The closing device can also be arranged in such a way that starting the motor vehicle 1 is only possible provided that the motor vehicle 1 is previously unlocked correctly.

 In addition, an optical and / or acoustic signal can be provided to confirm the effective actuation of the transmitter. For this purpose, it is possible to provide, for example, a simultaneous execution of the function provided for in normal service when the transmitter is actuated, for example locking or unlocking. In this case, the signal would consist of a descent or ascent of an interior locking button. If the transmitter and the receiver operate with infrared rays, it goes without saying that these components must have visible contact when the transmitter is actuated. Depending on the arrangement, it may then be necessary to remove the key from the key switch before actuation of the transmitter.

Claims (4)

 1. - Method for controlling a closing device for a motor vehicle provided with a centralized locking system, said closing device comprising a remote control device (3) for the centralized locking system, said control device remote (3) comprising a transmitter (4) with coding device (5), an energy accumulator (6) and a key (12) as well as a receiver (7) housed in the motor vehicle (1), and said coding device comprising a decoding device (8) complementary to the coding device (5), actuation of the transmitter (4) making it possible to generate a remote control change code word and to transmit it as a remote control change code signal, the remote control change code signal can be received by the receiver (7), and an unlock signal for the central locking system can be produced in the device. decoding if (8) as a function of a comparison of the received remote control change code signal with the remote control change code word stored in the decoding device, the remote control device (3) further comprising a transponder (9) provided with a transponder code word memory (10), the motor vehicle (1) being equipped with at least one transponder interrogation transceiver (16) with a transceiver code word memory (11), the motor vehicle (1) comprising at least one key switch (13) complementary to the key (12), which makes it possible to activate the transceiver d transponder interrogation (16), the transponder interrogation transceiver (16) being connected to the receiver (7) for the formation of a transponder change code word from the change code code word remote control, and transponder interrogation transceiver eur (16) allowing, as a function of a comparison of the transponder change code signal called up and received by The transponder interrogation transceiver (16) with the transponder change code word stored in the transceiver code word memory (11), to produce an unlock signal when the transmitter is off eVou an operating signal for the commissioning of at least one operating assembly (14) of the motor vehicle (1), and then forming, from the code word for remote control change, a new transponder change code word and to store it in the transceiver code word memory (11) as well as in the transponder code word memory (10), characterized in that , after replacing the energy accumulator (6) of the remote control device (3), the key (12) is inserted into the complementary key switch (13), only when the key is actuated (12 ) introduced causes activation of the transpo interrogation transceiver editor (16), which the activated transponder interrogation transceiver (16) calls in the transponder (9) the transponder change code word stored in the transponder code word memory (10) of the transponder (9) provided in the remote control device (3), that according to a comparison of the transponder change code word called and received with the transponder change code word stored in the word memory transceiver code (11), a timing circuit preferably arranged in the receiver (7) and opening a synchronization time window is activated, and only when the transmitter (4) is actuated when the inside the open synchronization time window, the remote control change code word then transmitted by the transmitter (4) is memorized in the receiver (7), replacing the control change code word at distance previously stored in the receiver (7).  2. - Method according to claim 1, characterized in that the remote control change code word transmitted by the transmitter (4) inside the open synchronization time window is not stored in the receiver (7) only if the central locking system is in the locked operating position.  3. - Method according to claim 1 or 2, characterized in that the activation of the transponder interrogation transceiver (16) is done by inserting the key (12) in the key switch (13).  4. - Method according to claim 1 or 2, characterized in that the activation of the transponder interrogation transceiver (16) is done by turning the key (12) in the key switch (13).