JPH05239961A - Electronic lock device for car door - Google Patents

Abstract

PURPOSE:To prevent any other person from altering the registered code No. by conducting registration and input of the code No. externally through turning on and off of an outside handle switch when door is in unlocked state. CONSTITUTION:When door is unlocked, a code No. is in advance registered in an electronic control unit 3, and disengagement is made with the output of the unit 3 when the identical code No. is entered externally. After the unlocked state is sensed, registration and input of the code No. are made through turning on and off of one outside handle switch 5. This allows omitting provision of a costly digital switch, facilitates the setting operations for the code, and permits certainly the driver to make registration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic lock device for a vehicle door in which a cipher is set by operating a handle for opening and closing the door.

[0002]

2. Description of the Related Art Generally, at least a door on the driver's seat side of an automobile door can be locked from the outside with an engine key, but a keyless lock type door can be locked without using the engine key. It is easy to cause a trouble that the engine key is locked with the engine key left. In such a case, various cryptographic unlocking devices have been proposed for unlocking the door lock from the outside without a key. For example, a ten-key is installed on the outer surface of the door, and if the code entered from the ten-key matches the code registered in advance in the internal processing device, the door lock is electromagnetically released. However, in this method, since the ten-key pad is exposed on the outer surface of the door, not only is the appearance impaired, but there is the drawback that it is easily mischievous.

Therefore, the inventors of the present invention previously proposed an electronic lock device for a vehicle door which utilizes a switch interlocking with an outside handle (handle) for opening and closing the door to input a code by operating the handle. According to this method, since no special parts are exposed on the outer surface of the door, there is no problem in terms of aesthetics and it is difficult to be tampered with.

[0004]

However, in the above method, since it is considered to use a digital switch for encryption setting (registration), it is expensive to implement. In other words, the microcomputer mounted in the vehicle as a processing device is becoming more and more inexpensive due to technological advances, but the digital switch, which requires one per code digit, has the function of setting the numbers 0 to 9 and is therefore inexpensive. Of course, if the switch is used for the number of cipher digits, it becomes expensive. Further, since these switches are installed near the microcomputer, there is a drawback that it is difficult for the user to perform the encryption setting operation.

The present invention solves the above-mentioned drawbacks and prevents the third party from easily changing the encryption by enabling the encryption setting and the encryption input by turning on and off a single switch. To do.

[0006]

In order to solve the problems, the present invention registers an encryption number in an electronic control unit in advance, and when the same encryption number is input from the outside, the door is unlocked by the output of the unit. However, in an electronic lock device for a vehicle door in which both registration and input of the encryption number are performed by turning on and off a single switch, the registration of the encryption number is permitted when the door is in an unlocked state. Is characterized by.

[0007]

The action of inputting the code number when the door is locked may be mischievous by a third party, but the action of inputting the code number when the door is unlocked can be judged to be by the driver. Therefore, when it is detected that the door is in the unlocked state, registration of the encryption number performed by turning on / off one switch is permitted, and the input encryption number is registered. As described above, the encryption number setting operation is easy for the driver and the encryption number is not easily changed by a third party.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing an embodiment of the present invention, 5 is a switch (outside handle SW) which is turned on and off in conjunction with an external handle for opening and closing a door, and 6 is a door solenoid of a driver's seat. SW and 7 are fuses. This solenoid SW6 is inside the door and instructs the ECU 3 to set (lock) or unlock (unlock) the door lock. The solenoid 4 is related to unlocking, and the locking solenoid is omitted. 31 is a CMOS microcomputer (microcomputer),
33 is a solenoid drive circuit.

FIG. 2 is a general flow chart showing the outline of the processing of the microcomputer 31, which distinguishes the encryption setting and the determination from the ON / OFF of the switch 6 and accordingly the presence / absence of the D seat lock. That is, if the serial signal is read when unlocked, it is set (registered) as an encryption, and if it is read when locked, the encryption judgment is performed. If the determination results match, a signal is output to the solenoid drive circuit 33 to energize the solenoid 4 (lock release).

FIG. 3 is a detailed flow of serial signal reading processing. In this process, the outside handle SW5
If it is OFF for 3 seconds or more, the encryption is judged to be valid, and if it remains OFF for 1 second, the digit is switched, but during that period,
When it changes to FF, the number of times is counted by the counter CNT,
The value is stored in the digit memory M _KETA . KETA is a digit counter that stores the number of digits.

FIG. 4 is an operation waveform diagram of FIG. 1, in which each digit of the cipher is inputted by making the number of times the outside handle SW5 is turned on correspond to the numbers 0-9. Then, depending on the state of the solenoid SW6, the code is set when the door is unlocked and the code is determined when the door is locked. Since they match in this example, the unlock solenoid control signal (unlock pulse) is output from the microcomputer 31 to the solenoid drive circuit 33.
The code digit can be changed depending on the time after the door is locked.

As described above, according to the first embodiment of the present invention, as shown in the flow chart of FIG. 2, since the encryption setting is permitted when the D door is in the unlocked state, the encryption number can be easily changed by a third party. There is no such thing. The example of FIG. 5 shows a first modification of the present invention, in which an encryption setting switch 8 is added in hardware, and in terms of software, encryption is performed between D door lock (N) and serial signal reading in FIG. The judgment step of setting SW ON is inserted. That is, the registration is permitted only when the door is unlocked and the cipher setting switch 8 is turned on. Therefore, it is possible to more reliably prevent the third party from changing the encryption number.

FIG. 6 shows a second modification of the present invention, in which a protection condition is added as pure software instead of the switch 8 described above, and encryption can be set only at the first D-door unlock after the initial. It is what Initialization is performed when the battery is connected, so the encryption setting (change) is performed by disconnecting the battery and reconnecting. This method does not require any additional hardware configuration.

FIG. 7 shows a third modified example of the present invention, which is a method for restricting encryption settings in the format of a serial signal. For example, if it is a three-digit code, it is invalid unless it is input within a fixed time. Specifically, the effective width of ON time a is 0.1 to 2 seconds, and the effective width of OFF time b is 0.1 to 2 seconds.
1 second, the effective width of the digit separation time c is 1 to 3 seconds, and OFF
When the time exceeds 3 seconds, it is determined that the input is completed, and if 3 digits are not input during this time, it is invalid. Also, a,
Signals that deviate from the range of b are also invalidated. A to above
The value of c is almost adjusted to the human operation interval.

FIG. 8 shows a fourth modification of the present invention, and FIG.
When executing the encryption valid process of No. 2 by software, a protection measure is added to turn on the handle SW for 10 seconds or more and then input a signal. Therefore, in this example, the D seat is unlocked, the handle SW is turned on for 10 seconds or more,
The encryption can be set only when the three conditions of "enable encryption" shown in FIG. 7 are satisfied. In this example, when the cipher inputs do not match three times in a row, a process of prohibiting reading for a certain period of time is also added.

Further, in the present embodiment, the signal is inputted by the switch interlocked with the external handle, but it goes without saying that a hidden SW or the like can be used.

[0017]

As described above, according to the present invention, an expensive digital SW is not used, the driver can easily set the cipher from the outside, and the cipher number can be easily changed by a third party. It is possible to realize an electronic lock device that can be reliably registered by the driver without the need.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a general flow chart.

FIG. 3 is a flowchart of a serial signal reading process.

FIG. 4 is an operation waveform diagram of FIG. 1.

FIG. 5 is a first modification example of the present invention.

FIG. 6 is a second modification of the present invention.

FIG. 7 is a third modification example of the present invention.

FIG. 8 is a fourth modification example of the present invention.

[Explanation of symbols]

 3 ... Electronic control unit 4 ... Unlock solenoid 5 ... Outside handle SW 6 ... Door solenoid switch 8 ... Code setting switch

Claims (1)

[Claims] 1. A cryptographic number is registered in advance in the electronic control unit, and when the same cryptographic number is input from the outside, the door is unlocked by the output of the unit, and the registration and input of the cryptographic number are both performed by a single switch. In the electronic lock device for a vehicle door, the electronic lock device for a vehicle door is characterized in that registration of the encryption number is permitted when the door is in an unlocked state.