JPH0416683A - Keyless lock system - Google Patents

Abstract

PURPOSE:To miniaturize a device and to prevent its unfair use by connecting a transmission unit to a reception unit after unlocking to automatically renew a code stored in both the units. CONSTITUTION:A keyless lock system in which a fixed key-code is transmitted from a transmission unit A and received by a reception unit B to unlock is provided. After unlocking operation, the unit A is connected to the unit B through a connecting means C. In the unit B, a control means Bl turns out and stores a renewing code every fixed period, and turns it out to the unit A to renew storage in a control means Al. A means for preventing that the unit A is removed during renewing to make the units A, B inconsistent in their codes is provided. In addition to that, a circuit for charging a battery A2 of the unit A during the renewing of the storage is provided. Thus a renewing circuit and the battery can be miniaturized, and the safety of the titled system can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a keyless lock system that unlocks a lock by transmitting a predetermined key code signal from a transmitting unit.

<Prior art> This type of keyless lock system transmits a preset key code from a transmitting unit, and the receiving unit determines whether the received code matches a predetermined code. .

The set code will never be changed.

<Problem to be Solved by the Invention> If the code is not changed as described above, the security of the lock system will be compromised because if it is copied several times, it will be vulnerable to unauthorized use. occurs. To counter this, measures can be taken, for example, to automatically update the code at regular intervals, automatically update the code at regular intervals, or update the code manually as necessary. is possible.

However, in order to update the code at fixed intervals, timers are required for both the transmitting and receiving units, making the device configuration complex and large. In this case, if the signal from the transmitting unit is not received, the counts on both sides will deviate and normal operation will not be possible. In addition, in the case where the code is updated manually, the updating operation is troublesome, and the device configuration also requires sending and receiving signals for updating, resulting in problems such as being complicated and large.

The present invention has been made in view of these problems, and aims to enable code updating with a simple configuration.

Means for Solving the Problems> In order to achieve the above object, the keyless lock system of the present invention electrically connects a transmitting unit that is stored or placed in a predetermined location when not in use to a receiving unit. It comprises connecting means and control means for changing the code when the receiving unit is connected to the transmitting unit to automatically update the codes stored in the storage means of both units.

Further, when the receiving unit is connected to the transmitting unit by the connecting means, the power source battery of the transmitting unit is charged.

FIG. 1 is a diagram showing the configuration of the present invention, where A is a transmitting unit, B is a receiving unit, C is a connecting means, 80 and B1.
is a control means, A2 is a power source battery for the transmitting unit, and D is a main power source.

Function> The transmitting unit is used only when unlocking, and after unlocking, it is placed in a designated place and stored as needed to prevent it from being lost.

Therefore, even if the device is connected to the receiving unit after unlocking, there is no problem in use, and the code is automatically updated during that time, and the unlocking operation is performed using the new updated code at the first use. Therefore, even if the code is copied and an unauthorized use is attempted, the code has already been changed and the lock cannot be unlocked, thus maintaining the security of the system.

In addition, since the transmitting unit is made compact to be carried, its power source battery is also of small capacity, so it is charged from a large-capacity main power source while connected to the receiving unit, and is therefore a power source. The battery is prevented from becoming discharged.

<Example> Next, an illustrated example will be described. This example is for a car door lock system,
Of course, this invention can be applied to systems for other uses.

Figure 2 is a block diagram of the transmitting unit, and Figure 3 is a block diagram of the receiving unit, where 1 is the transmitting unit, 2 is the receiving unit, 3 is the connection device on the sending <= unit side, and 4 is the connection on the receiving unit side. The device 5 is a battery installed in a car.

The transmitting unit l includes a microcomputer 11 which is the center of control, a signal output circuit 12 which outputs signals such as ultrasonic waves or infrared rays, an EEPROM 13 which stores key codes and other necessary data, a control bus 14, a charging circuit 15, and a transmitting switch. 16, a battery 17, etc.

The receiving unit 2 includes a microcomputer 21. which serves as the center of control. A signal input circuit 22 for receiving signals from the transmitting unit 1, an EEPROM 23 for storing key codes and other necessary data. It includes a control bus 24, a power supply circuit 25, a regulator 26, a door lock drive circuit 27, and the like.

The door lock drive circuit 27 is configured to output a predetermined signal from an unlock signal output terminal 27a or a lock signal output terminal 27b to a locking device (not shown) in accordance with a command from the microcomputer 21, and is configured to output a predetermined signal to a locking device (not shown) from an unlock signal output terminal 27a or a lock signal output terminal 27b according to a command from the microcomputer 21. The microcomputer 21 is configured to receive an ignition switch on/off signal from the microcomputer 28 .

The connection device 3 also includes a charging terminal 31 to which the charging circuit 15 is connected, a control signal terminal 32 to which the control bus 14 is connected, and a grounding terminal 33 to which a grounding circuit is connected. The device 4 has a power supply circuit 2
5 is connected, a control signal terminal 42 is connected to the control bus 24, and a ground terminal 43 is connected to the ground circuit.

These connecting devices 3 and 4 are connected to the transmitting unit 1 after the unlocking operation.
This is for connecting the receiving unit 2 and the receiving unit 2. For example, a placing part of the transmitting unit 1 is provided on the top surface of the dash board in front of the driver's seat, and the connecting device 4 on the receiving unit 1 side is connected to this placing part. The connecting devices M3 and M4 can be easily connected when the transmitting unit 1 is placed on this mounting section. Various types of structures can be used for the specific connection part, such as a plug-like structure that can be applied with pressure from the main body as needed, such as in a rechargeable electric shaver. The connection device 3 may be provided in the transmission unit 1, and a corresponding plug receptacle may be provided in the mounting portion as the connection device 4. It would be convenient to have a structure in which the connection is automatically made by placing or inserting the transmitting unit 1 on the placing part like a cigarette lighter. If the transmission unit 1 is installed in the car, the location can be specified and the transmission unit 1 can be prevented from being lost.

This embodiment has the above-mentioned configuration, and the user carries the transmitting unit 1 when the lock is locked, and when the lock is unlocked, the signal output circuit 12 of the transmitting unit 1 is directed to the signal input circuit 22 of the receiving unit 2 to send a signal. By turning on the switch 16,
The microcomputer 11 operates and the EEPROM 13
The signal (j) corresponding to the predetermined code stored in the signal output circuit 12 is output from the signal input circuit 2.
The code of the signal received by 2 is sent to the microcomputer 21.
is compared with the code stored in EEPROM23,
If the codes match, an unlock signal is output from the door lock drive circuit 27 to a lock device (not shown), and the door is unlocked.

After unlocking the door and getting into the car, connect device 3
, 4 are connected, the microcomputer 1 of both units 1 and 2 is activated by a preset program.
1 and 21 are activated, the codes stored in the EEPROMs 13 and 23 are changed, and at the same time, the battery 17 of the transmitting unit 1 is connected to the car battery 5 through the power supply circuit 25 and the charging circuit 15 to be charged. .

Next, the procedure for unlocking and changing the code will be explained with reference to FIG. 4 and the subsequent drawings. FIG. 4 is a flowchart of the transmitting unit 1, and FIG. 5 is a flowchart of the receiving unit 2. Note that the code may be changed once each time the transmitting unit 1 is connected to the receiving unit 2, but in this embodiment, the code is changed constantly during the period when the transmitting unit l is connected to the receiving unit 2. The code is changed every cycle.

As shown in FIG. 4, in the transmitting unit 1, it is first determined in step S1 whether or not it is connected to the receiving unit 2. If it is not connected, the process proceeds to the next step S2 and the operating state of the transmitting switch 14 is changed. It will be judged. If the transmission switch 14 is on, the EEPROM 13L8
The stored code is read and a predetermined code is transmitted according to the procedure of step S4. Also, step S1
If the transmitting unit 1 is connected to the receiving unit 2 in step S5, the updated new code is
It is stored in EPROM13. Details of steps S4 and S5 will be described later.

On the other hand, in the receiving unit 2, as shown in FIG. 5, it is determined in step S6 whether or not the transmitting unit 1 is connected, and if it is not connected, the process proceeds to the next step S7 to determine whether the code signal is being transmitted. It is determined whether or not. If the code signal is being transmitted, the code signal sent in step S8 is input, and the code stored in the EEPROM 23 is read out in step S9. If the codes match, the lock device is activated by the output of the door lock drive circuit 27. actuator is driven to unlock the door. Also, step S
When the transmitting unit 1 is connected in step S10, it is confirmed in step S10 that the ignition switch is on;
If it is on, start the timer in step S11,
When a preset predetermined period of time has elapsed, the process proceeds to the next step S12, where a new code is output from the microcomputer 21, and this new code is sent to the EEPR○M.
23 and at the same time the EEPRO of transmitting unit l.
After being written to M13 (step S5), the timer is cleared, the process returns to step S6, and the same operation is repeated again. Therefore, while the receiving unit 2 is connected, the code is repeatedly updated every time the timer set time (for example, 1 minute) elapses. The new code can be determined by any appropriate method, such as by randomly specifying the addresses of a large number of codes stored in each spare address of the EEPROM 23 in advance, or by creating a code each time according to a program. .

By the way, since transmitting unit 1 is removed from receiving unit 2 when you get off the car after driving, the update is interrupted while the code is being updated according to the procedure described above, and the code is stored in each unit. Although there is a possibility that the codes do not match, this embodiment solves this problem as follows.

That is, each EEPROM 13 and 23 has three addresses Nα1, Nα2, and NcL3 prepared as addresses for storing a predetermined code, and writing is performed at E E
P ROM 13 (7) N(11-) E E
P ROM 23 (7) Na 1-+ E E P
ROM l 3 (7) Na 2-+ E E P
ROM 23 (7) Nc 2-+ E E P
ROM 13 (7) Na 3-) E E PRO
The writing order is defined so that the writing is performed in the order of M23 and Nα3. Further, if writing to the EEPROM 13 of the transmitting unit 1 is interrupted midway, the next writing is performed from the interrupted address Na. Therefore,
For example, if Nα2 and Nα3 of the EEPROM 23 are different, it means that the interruption occurred at Nα3 of the EEPROM 3, so the next write is performed from Nα3 of the EEPR○M13, and the writing ends after writing to Na2 of the EEPROM 23.

Because such processing is performed, each memory address of the EEPROM 13 of the transmitting unit 1 has the sixth
As shown in the figure, either the old code before the update, the new code after the update, or the code destroyed due to write interruption (indicated by an x) will be written, and the combination will be as shown in the figure. . In other words, if only Nα1 is different as in timing 1, if everything is different as in timing 2, Nα1 is different as in timing 3.
There are four cases: a case where only α3 is different, and a case where there is no interruption and everything is the same as in timing 4.

Therefore, in the case of timing 1 where only the rod 1 is different, it is sufficient to send the code written in Nα2 or Nα3, and in the case of timing 2 where everything is different, the code written in Na 1 or Na 3 is sent. In the case of timing 3 where only Nα3 is different, it is sufficient to send the code written in Nα1 or Nα2, and in the case of timing 4 where they are all the same, Nα1 to Nci 3. You can also send the Z9 code. Therefore, in this embodiment, if only Nα1 is different, the code written in Nα2 is transmitted, and in other cases, the code written in Nα] is transmitted. Step S4 in FIG. 4 shows this processing procedure. Since the Na 1 or Na 2 code is transmitted through such processing, the receiving unit 2 compares it with the code written in Nα1 of the EEPROM 23 at any timing to determine whether the code matches. All you have to do is
Step S9 in FIG. 5 shows this processing procedure.

In addition, instead of following the above procedure, for example, a procedure can be used in which the sending unit 1 sends the new and old codes alternately, and if the receiving unit 2 matches either the new or old code, the lock is unlocked. This method also solves the problem of code mismatch caused by update interruption.

<Effects of the Invention> As is clear from the above embodiments, the present invention connects the transmitting unit to the receiving unit after unlocking, and automatically updates the unlocking key code.

Therefore, the code used to unlock the door is not constant, and even if the code is copied and unauthorized use is attempted, the lock cannot be unlocked, thus maintaining the security of the system. In addition, the device configuration does not require timers or means for transmitting/receiving signals for updating, and can be realized by changing the program of the conventional control means. This makes it possible to improve the safety of the system.

In addition, when the receiving unit is connected to the transmitting unit, the transmitting unit's power battery is charged, which increases the chances of charging the power battery and allows the use of a smaller battery. Malfunctions can be prevented.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of the present invention, FIGS. 2 and 3 are block diagrams of one embodiment, FIGS. 4 and 5 are flowcharts of control operations, and FIG. 6 is an explanation of the code storage state. It is a diagram. l...Transmission unit, 2...Reception unit, 3, 4
...Connection device, 5,17...Battery, 11.21
... Microcomputer, 12 ... Signal output circuit, 13.23 ... EEPROM, 14, 24 ... Control bus, 15 ... Charging circuit, 16 ... Transmission switch, 22 ... Signal Input circuit, 25... Power supply circuit, 27... Door lock drive circuit, 31... Charging terminal, 32°42... Control signal terminal, 33.43.
...Earth terminal. 41...Power terminal.

Claims (2)

[Claims] (1) In a keyless lock system configured such that a key code signal is transmitted from a transmitting unit to a receiving unit, and when the codes match, a locking device provided on the receiving unit side is unlocked. A connecting means for electrically connecting a transmitting unit stored or placed at a location to a receiving unit; and a connecting means for changing a code when the receiving unit is connected to the transmitting unit by the above connecting means and storing it in the storage means of both units. A keyless lock system comprising: a control means for automatically updating a stored code. 2. The keyless lock system according to claim 1, wherein the power battery of the transmitting unit is charged when the receiving unit is connected to the transmitting unit by the connecting means.