JPH06239202A - Data communication method of security device - Google Patents

Abstract

PURPOSE:To improve safety of a security device against unjustly reproduced transmitting unit. CONSTITUTION:A transmitting unit 1 counts the number at every transmitting, and after adding a decided shift number to an ID code stored before transmitting, renews the ID code, then transmits the above-stated decided data having the renewed ID code. A security device main body 2 receives a transmitted signal from the transmitting unit 1, and compares and discriminates the ID code contained in the transmitted signal with the stored present ID code. When the received ID code is same as the present ID code, or it is larger than the value of the present ID code and a discrimination computation processed ID code for computing the initial value of the ID code is conformed to the initial value of the previously stored ID code, it can be received, the discrete value corresponding to the received ID code is increased by one step, and a decided shift number is added to the ID code so as to be renewed to the present ID code.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication method for a security device, and more particularly to a data communication method for a security device for preventing theft by a copying device such as a learning remote controller.

[0002]

2. Description of the Related Art Conventionally, an anti-theft device (security device) for preventing an automobile from being stolen has a person opening the door of the automobile, giving a considerable shock to the automobile, or a trunk to steal the automobile while security is activated. When the door is opened, the siren sounds, the headlights of the car blink, and the starter cut (to prevent the engine from starting) or fuel cut to prevent the car from running and to prevent theft.

As such a security device, there is one in which the security operation is started and stopped by a portable transmission unit (remote control unit), and the security unit is activated (called arming) and stopped (called disarming) by the transmission unit. This is done by pressing an arming key or disarming key provided.

By the way, in a security device using such a transmission unit, the transmission data signal of the transmission unit has a predetermined ID (identification) code.
Arming or disarming can be performed only on a vehicle equipped with a security device body having the same ID code as the D code. Therefore, the transmission unit having a different ID code cannot perform arming or disarming, and thus it plays a special role in preventing the theft of a car.

[0005]

However, in such a conventional data communication method for a security device, the transmission unit fixes the ID code included in the transmission data signal. Therefore, if a duplicating device such as a learning remote controller is used during the disarming by the legitimate transmission unit and the transmission data is copied, it is possible to duplicate the same transmission unit as the real one. Therefore,
If such copying is illegally performed, the security of the security device cannot be guaranteed.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a data communication method for a security device which can enhance the security of the security device against illegally duplicated transmission units.

[0007]

According to the present invention, the first device counts each transmission and adds a predetermined number of shifts to the ID code stored before the transmission. After that, a means for updating the ID code, a means for transmitting the predetermined data having the updated ID code, a second device for receiving a transmission signal from the first device, and a transmission signal for the transmission signal. The received ID is determined by comparing the included ID code with the stored current ID code.
If the code is the same as the current ID code, means for switching to the transmission signal reception state, and in this transmission signal reception state,
A means for updating the current ID code by incrementing the received count by one and adding a predetermined shift number to the ID code, and if the received ID code is larger than the value of the current ID code, This is achieved by means for performing a discrimination calculation process for calculating the initial value of the code, and if the code matches the initial value of the ID code stored in advance, switching to the transmission signal acceptance state.

[0008]

In the data communication method of the security device having the above structure, the first device counts each time it transmits, and after adding the predetermined shift number to the ID code stored before the transmission, The ID code is updated, and the predetermined data having the updated ID code is transmitted.

The second device receives the transmission signal from the first device, compares and discriminates the ID code included in the transmission signal with the stored current ID code, and the received ID code is the current ID. If it is the same as the code, the transmission signal is accepted. In this transmission signal acceptance state, the reception count is incremented by 1, and the current ID code is updated to the ID code plus a predetermined shift number. When the received ID code is greater than the numerical value of the current ID code, the discriminant calculation process for calculating the initial value of the ID code is performed, and the code matches the previously stored initial value of the ID code. In this case, the transmission signal is accepted, the count corresponding to the received ID code is incremented by 1, and the current ID code is updated to the ID code plus a predetermined shift number. Therefore, the ID is always being transmitted.
Since the code is updated, it is not possible to copy a transmission unit similar to the real one by using a duplication device such as a learning remote controller during the disarming by the regular transmission unit and copying the transmission data.

[0010]

1 is a block diagram of the essential parts of a security device according to the present invention. First, the structure will be described. 1 is a portable transmission unit (remote control unit), which can transmit an arming command signal or a disarming command signal to a vehicle-mounted security device main body by pressing a key. In the transmission unit 1, 11 is an arming key, 12 is a disarming key, and 13 is a reset key for returning the ID code to the initial ID code. The reset key 13 can also be operated by double pressing the arming key and the disarming key.

Reference numeral 14 denotes a remote controller, which is a first counter 14a for counting the number of transmissions each time the arming key 11 or the disarming key 12 is pressed.
The first storage unit 14b for storing the ID code, the ID code stored in the first storage unit 14b are shifted by a predetermined number of shifts according to the count of the first counter 14a, and are updated and set. It has an ID code setting unit 14c and the like, and generates and outputs predetermined data including the ID code updated according to the key.

Reference numeral 15 is a modulation circuit which modulates a carrier wave of a predetermined frequency of a transmission circuit, which will be described later, with predetermined data output from the remote controller control unit 14. Reference numeral 16 is a transmission that generates a carrier wave of a predetermined frequency, modulates the carrier wave by a modulation circuit 15 to generate a modulated signal, and power-amplifies the modulated signal to radiate a radio wave from a loop type antenna 17 connected to an output side. Circuit.

Reference numeral 2 denotes a security device main body, which is (1)
When the vehicle is stopped and the door is closed, the arming command signal from the transmission unit 1 can be accepted,
In the receivable state, the security operation is started in response to the arming command signal sent from the transmission unit 1, (2) the security operation is stopped by receiving the disarming command signal, and (3) the thief in the security operation state. When a theft operation by is detected,
Perform anti-theft operation.

Here, the respective components of the security device main body 2 will be described. Reference numeral 21 is a receiving antenna, and 22 is a receiving section for receiving and demodulating a signal transmitted from the transmitting unit 1. Reference numeral 23 denotes a security control unit that starts a security operation in response to an arming command signal sent from the transmission unit 1 and stops the security operation based on the disarming command signal.
When the theft operation by a thief is detected in the security operation state, the antitheft operation is performed. An ID code is included in the arming command signal or the disarming command signal from the transmission unit 1 and can be accepted only when the ID code matches the ID code stored in the security control unit 23.

Further, the security control section 23 counts the number of receptions of the arming command signal or the disarming command signal each time it receives the second counter 23.
a, a second storage unit 23b for storing the ID code, a predetermined shift number is added to the received ID code according to the count of the counter 23a, and the ID code stored in the second storage unit 23b is shifted. Is added to the second ID code setting unit 23c, and the determination calculation unit 2 is added.
It has 3d.

Upon receipt of, for example, a disarming command signal from the transmission unit 1, the judgment calculation unit 23 compares and judges the ID code included in the predetermined data with the ID code stored in the second storage unit 23b. If yes, disarm the security action. If they do not match, a predetermined calculation process is performed based on the received ID code and the ID code stored in the second storage unit 23b to calculate the initial value of the ID code. If the initial value is the same as the initial value of the ID code stored in the second storage section 23b, the arming is disarmed. If it is not the initial value, it will not be disarmed.

Reference numeral 3 denotes a detector for detecting opening / closing of a door, vibration of a vehicle, opening / closing of a trunk, and the like.
A vibration detection sensor 32, a trunk opening / closing sensor 33, etc. are provided. Reference numeral 4 denotes an anti-theft unit, which uses a blinking drive signal BLD output from the security control unit 23 when an abnormality (for example, door opening / closing, vehicle vibration, trunk opening / closing, etc.) is detected by each sensor during security operation. It has a light driver 41 that blinks the headlight and a siren driver 42 that sounds the siren by the siren drive signal SDR.

Reference numeral 5 denotes an engine control unit which, when an abnormality is detected by each sensor during a security operation, performs an engine starter cut or a fuel cut by a signal ESP output from the security control unit 23 to start the engine. Prohibit

Reference numeral 6 denotes a reset key, which is a transmission unit 1
When the arming key 11 or the disarming key 12 is pressed many times, the calculation processing time of the determination calculation unit 23d of the security control unit 23 is long, so the reset key 13 of the transmission unit 1 is pressed. Set the ID code to the first acceptance value.

FIG. 2 shows the security device I according to the present invention.
FIG. 2 is an explanatory diagram for explaining D code setting, and FIG.
The operation of the ID code setting process of the security device of FIG. 1 will be described in detail with reference to FIG. First, referring to FIG. 1, in the transmitting unit 1, the arming key 1
1 or the disarming key 12 is pressed,
The first counter 14a of the remote controller control unit 14 counts as (1), and the first ID code setting unit 14c causes the first counter 14a of FIG.
ID code (11) corresponding to the counter number (1) in
114) is set and the ID code (11111) stored in the first storage unit 14b is updated. The ID code (11111) is an initial value of the ID code stored in advance in the first storage unit, and is composed of hexadecimal 5 bits. Therefore, the remote controller control unit 14 transmits predetermined data including the ID code (11114) to the modulation circuit 15
And outputs it via the transmission circuit 16 and the loop type antenna 17.

That is, in the transmission unit 1, each time the arming command signal or the disarming command signal is transmitted, the counter number of the first counter 14a is incremented by one and the first ID code setting section 1
4c shifts the lowest row of the ID code stored in the first storage unit 14b by three. Then, the ID code stored in the first storage unit 14b is updated to this shifted ID code.

Next, in the security device main body 2 shown in FIG. 1, the security control unit 23 sends an arming command signal including the ID code (11114) or a disarming command signal via the antenna 21 and the receiving unit 22. If the received ID code matches the ID code stored in the second storage section 23b, a predetermined security operation is executed. At the same time, the second counter 23a is incremented by 1 (see FIG. 2) to (2), and the least significant row of the ID code received by the second ID code setting section 23c is shifted by 3. (11117) as the second
The updatable ID code (11114) stored in the storage unit 23b is updated to (11117). The initial value (1111) of the fixed ID code is stored in the second storage unit 23b.
The updatable ID code (11114) to which 1) and a predetermined shift number (3 in this embodiment) have already been added is stored.

That is, in the security device main body 2, every time the security control unit 23 receives a transmission data signal from the transmission unit 1, the second counter 23a therein is incremented by one and the received ID code is received. 3 is shifted to the lowest row and the ID code stored in the second storage section 23b is updated to the shifted ID code.

Accordingly, even if the transmission data signal is copied by the duplication device by the thief, since the ID code is different each time it is transmitted, the thief cannot cancel the security device.

Next, the case where the key of the transmission unit 1 is pressed idle will be described. For example, when the ID code (1111A) of the counter number (3) in FIG. 2 is to be transmitted from the transmission unit 1, the owner of the transmission unit 1 etc. corresponds to the counter number (6) by pressing three times.
When the D code (11123) is transmitted, the security device main body 2 performs the following calculation in order to obtain the initial value of the ID code by the determination calculation unit 23d.

That is, in order to obtain the initial value of the ID code from the received ID code, (received ID code)-(ID code stored in the second storage section) =
(Predetermined shift number) × (Number of idle pushes) Since the equation (1) is used, the number of idle pushes is obtained from the equation (1). Therefore, the number of counters of the received ID code is (the number of counters of the received ID code) = (the number of counters counted in the second counter) + (the number of idle pushes) (2). Therefore, the initial value of the ID code is (initial value of ID code) = (received ID code) − (predetermined shift number) × (number of received ID code counters) ...
It is calculated as equation (3).

Specifically, from the equation (1), (1112
From (3)-(1111A) = 9 = (3 × 3), the number of (idle presses) is 3 times. Therefore, from the equation (2), (the number of received ID code counters) is 3 + 3 = 6,
From the formula (3), (the initial value of the ID code) is (1112
3) -3 × 6 = (11111). Therefore, since it matches the initial value of the ID code stored in the second storage unit 23b, a predetermined security operation is executed.

At the same time, the discriminating / calculating section increments the number of the ID code received by the second counter by one to (7), and at the same time, the second ID code setting section 23.
The number of shifts 3 is added to the ID code (11123) received by the second storage unit 23b as (11126).
ID code (1111A) stored in (111
26). However, the determination calculation unit 23d determines that (the received ID code)-(I stored in the second storage unit).
If D code) <0, the ID code already received is not accepted.

Therefore, even if the transmission data signal is copied by the thief by the duplication device, the ID code is different each time it is transmitted, so the thief cannot cancel the security device.

[0030]

As described above, according to the present invention, in the first device, each time transmission is performed, the counting is performed, and the ID code stored before transmission is provided with a predetermined shift number. After the addition, the ID code is updated, and the predetermined data having the updated ID code is transmitted.
In this device, the transmission signal from the first device is received, and the ID code included in the transmission signal and the stored current I
When the received ID code is the same as the current ID code, it is switched to the transmission signal acceptance state. In this transmission signal acceptance state, the reception count is 1
And the current ID code is updated by adding a predetermined shift number to the ID code, and the received I code is also updated.
If the D code is larger than the current ID code, I
Discrimination calculation processing for calculating the initial value of the D code,
If the code matches the initial value of the pre-stored ID code, it is better to switch to the transmission signal acceptance state, so even if the transmission signal is copied by the duplication device by the thief, the security device cannot be released. .

[Brief description of drawings]

FIG. 1 is a block diagram of a main part of a security device according to the present invention.

FIG. 2 is an explanatory diagram for explaining ID code setting of the security device according to the present invention.

[Explanation of symbols]

 1 Transmitting Unit 2 Security Device Main Body 3 Detecting Section 4 Anti-Theft Section 6 Reset Key

Claims (2)

[Claims] 1. A data communication method for a security device for transmitting predetermined data from a first device to a second device, wherein the first device counts each time it transmits and stores it before transmission. The ID code is updated after adding a predetermined shift number to the updated ID code.
The predetermined data having the D code is transmitted, and the second device receives the transmission signal from the first device and compares and discriminates the ID code included in the transmission signal with the stored current ID code. If the received ID code is the same as the current ID code, the transmission signal reception state is switched to. In this transmission signal reception state, the reception count is 1
And a current ID code is updated to a value obtained by adding a predetermined shift number to the ID code, and the data communication method of the security device. 2. The second device, when the received ID code is larger than the numerical value of the current ID code, performs a determination calculation process for calculating an initial value of the ID code, and the code is stored in advance. If it matches the initial value of the ID code,
The data communication method of the security device according to claim 1, wherein the transmission signal reception state is switched to.