JPH06247259A - Security device - Google Patents

Abstract

PURPOSE:To enhance the safety for duplication and respond well to an empty push operation by comparing a received stationary ID code and variable ID code with a stationary and a variable ID code in a memory part, actuating the security motion when the codes are identical, and also updating the stored variable ID code to a new ID code. CONSTITUTION:A transmitter unit 1 transmits data to a receiver unit 2, and when data from the unit 2 is received after transmitting, specified factor is added and the variable ID code in the first memory part 13a is updated to a new variable ID code. The receiver unit 2 compares the received codes with the stationary and variable ID codes stored in the second memory part 23a, and when the codes are identical, the security motion is started or stopped. At the same time, specified factor is added to the stationary ID code in the second ID code setting part 23c, and the variable ID code in the second memory part 23a is updated to new variable ID code, and when the codes are identical, data is transmitted to the transmitter unit, 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a security device, and more particularly to a security device for preventing theft or intrusion due to duplication of an ID code.

[0002]

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

As such a security device, there is one in which a security operation is started and stopped by a transmission unit (remote control unit) which can be remotely controlled. The start and stop (called disarming) of the security operation is performed by the transmission unit. This is done by pressing the arming key or disarming key provided on the.

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 receiving unit having the same ID code as the D code. Therefore, a transmitting unit having a different ID code cannot perform arming or disarming, which serves to prevent the car from being stolen.

[0005]

However, in such a conventional security device, the transmission unit fixes the ID code included in the transmission data signal. Therefore, if a duplication device such as a learning remote controller is used during the disarming by the regular transmission unit and the transmission data is duplicated, a transmission unit similar to the real one can be duplicated. Therefore, if such copying is illegally performed, the security of the security device cannot be guaranteed.

As a solution, the ID code is changed and transmitted to the security receiving unit each time the transmitting unit transmits, and the security receiving unit transmits the next receivable ID code to the transmitting unit at each reception. A method of setting in synchronization is considered. However, when the transmitter unit is pushed by a distance from the security receiver unit, the security receiver unit stores the ID code before being pushed, so that the transmission data signal from the transmitter unit is not accepted. There is such a problem.

In view of the above, an object of the present invention is to provide a security device which can enhance the security of the security device against illegally duplicated transmission units and can cope with a push-push of the transmission unit.

[0008]

According to the present invention, there is provided a security device for transmitting and receiving data between a transmitting unit and a security receiving unit, wherein the transmitting unit and the security receiving unit have a fixed ID code and a variable ID code, respectively. The transmitting unit includes a storage unit that stores the ID code and the predetermined coefficient, and the transmitting unit transmits the data including the fixed ID code and the variable ID code to the security receiving unit, and the data receiving unit that receives the data from the security receiving unit. Section and the variable ID stored in the storage section when a new variable ID code is obtained by adding a predetermined coefficient to the fixed ID code when data is received from the security receiving unit after data transmission.
The security receiving unit has a data setting unit for updating the code to the new variable ID code, and the security receiving unit stores the fixed ID code and the variable ID code of the received data, and the data receiving unit. A data comparison / determination unit that compares the fixed ID code and the variable ID code stored in the unit, and an operation control unit that starts or stops a predetermined security operation according to the content of the received data when the codes match. , A data setting unit for adding a predetermined coefficient to the fixed ID code to obtain a new variable ID code when the codes match, and updating the variable ID code stored in the storage unit to the new variable ID code. , A data transmission unit that transmits data including a fixed ID code to a transmission unit when each code matches. .

[0009]

In the security device having the above structure, the transmitting unit and the security receiving unit each have a storage unit for storing a fixed ID code, a variable ID code and a predetermined coefficient, and the transmitting unit stores the fixed ID code and the variable ID code. A fixed ID is sent when the data including the data is transmitted to the security receiving unit and the data from the security receiving unit is received after the data is transmitted.
A predetermined coefficient is added to the code to obtain a new variable ID code, and the variable ID code stored in the storage unit is updated to the new variable ID code.

When receiving the data from the transmitting unit, the security receiving unit compares the received fixed ID code and variable ID code with the fixed ID code and variable ID code stored in the storage unit, and the respective codes are When they match, a predetermined security operation is started or stopped according to the content of the received data, and when each code matches, a predetermined coefficient is added to the fixed ID code to obtain a new variable ID code. Update the variable ID code stored in the new variable ID code,
Further, when the codes match, the data including the fixed ID code is transmitted to the transmission unit.

Therefore, even if the transmission data is copied, since the variable ID code of the transmission data from the transmission unit is different every time, the security device cannot be disarmed. Also, the variable ID code of the transmitting unit will be updated each time data is received from the security receiving unit. Therefore, even if the transmitter unit is pressed in the place where the data from the transmitter unit does not reach the security receiver unit, the data in the security receiver unit is not transmitted, so that the transmitter unit can be prevented from being pressed.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a principal block diagram showing an embodiment of a security device according to the present invention. First, the configuration will be described. Reference numeral 1 is a portable transmission unit (remote control unit), which enables a data signal such as an arming command signal or a disarming command signal to be transmitted to an in-vehicle security receiving unit described later by pressing a key. Has become. In the transmitting unit 1, 11 is an arming key,
Reference numeral 12 is a disarming key.

Reference numeral 13 denotes a control unit, which has a fixed ID code (ID code A) and an updatable ID code (ID
Code B), a first storage unit 13a storing a predetermined random coefficient, and a predetermined random coefficient for the ID code A when data is received from a security receiving unit described later after the data is transmitted. Is added to update and set the ID code B stored in the first storage unit 13a, and the like. The first ID code setting unit 13b and the like are included, and are stored in the first storage unit 13a according to the key. The predetermined data including the ID code A and the ID code B that have been generated is generated and output.

Reference numeral 14 is a first modulation circuit that modulates a carrier wave of a predetermined frequency of a transmission circuit, which will be described later, with predetermined data output from the control unit 13. Reference numeral 15 denotes a carrier wave having a predetermined frequency, the carrier wave is modulated by a modulation circuit 14 to generate a modulated signal, and the modulated signal is power-amplified to transmit an ID code A from a transmission loop type antenna 16 connected to an output side. And the first transmission circuit for transmitting data for starting or stopping the security operation including the updated ID code B. Reference numeral 17 is a first receiving unit that receives data from a security receiving unit, which will be described later, via the receiving loop antenna 18.

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

Here, each component of the security receiving unit 2 will be described. Reference numeral 21 is a receiving antenna, and 22 is a receiving antenna.
Is a second receiver for receiving and demodulating data signals such as arming command signals and disarming command signals transmitted from the transmission unit 1. A security control unit 23 responds to an arming command signal sent from the transmission unit 1 to start a security operation, stops a security operation in response to a disarming command signal, and further, in a security operating state, a thief. When a theft operation due to is detected, an antitheft operation is performed. The ID codes A and I are included in the arming command signal or the disarming command signal from the transmission unit 1.
The D code B is included and can be accepted only when the ID code A and the ID code B stored in the security control unit 23 match.

Further, when the security control section 23 receives, for example, a disarming command signal from the second storage section 23a for storing the ID code A, the updatable ID code B, and a predetermined random coefficient, the transmission unit 1 receives the disarming command signal. The ID code A and ID included in the data are compared with the ID code A and the ID code B stored in the second storage unit 23a, and if they match, the received data is output as it is. Comparison and determination unit 23b,
The second ID for inputting the received data, adding a predetermined random coefficient to the ID code A stored in the second storage unit 23a, obtaining a new ID code B, and updating and setting it.
The code setting unit 23c is an operation control for inputting the received data and activating or stopping a predetermined security operation according to the content of the data, or for performing an antitheft operation when a detection signal from a detection unit described later is received. It has a portion 23d.

Reference numeral 24 is a second modulation circuit for modulating a carrier wave of a predetermined frequency of a second transmission circuit, which will be described later, with predetermined data including the ID code A output from the security control section 23. 25 generates a carrier wave having a predetermined frequency different from that of the transmission unit 1, and modulates the carrier wave by the modulation circuit 2
4, the modulated signal is generated, and the modulated signal is power-amplified to update the ID code B stored in the first storage unit 13a of the transmission unit 1 from the transmission antenna 26 connected to the output side. Is a second transmission circuit for transmitting data including the ID code A for. here,
For example, the transmission output output from the second transmission circuit 25 is made larger than the transmission output of the first transmission circuit 15 of the transmission unit 1, or the first reception unit 1 of the transmission unit 1 is used.
When the data is transmitted from the transmission unit 1 such that the reception sensitivity of 7 is better than the reception sensitivity of the second reception unit 22 of the security reception unit, the transmission unit 1 always receives the data from the security reception unit 2. I am trying to receive it.

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

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

FIG. 2 is a flow chart in which the control unit 13 sets the ID code B in the transmission unit 1 according to the present invention.
The setting process of the ID code B will be described with reference to this flowchart.
First, assuming that the arming command signal has already been transmitted from the transmitting unit 1 to the security receiving unit 2 and the security operation is being performed, and then the disarming key 12 of the transmitting unit 1 is pressed to disarm the security operation, When the control unit 13 receives the disarming key input (step 101), the ID
Code A and security receiving unit 2 before transmission
The data corresponding to the disarming key including the ID code B added with a predetermined random coefficient by receiving the data from the first modulation circuit 14, the first transmission circuit 15, and the transmission loop type antenna 16 are transmitted. Through (step 102).

After the transmission, data is transmitted from the security receiving unit 2, and when the control unit 13 receives the data through the receiving loop type antenna 18 and the first receiving unit 17 (step 103), the first ID code setting unit. ID by 13b
A predetermined random coefficient is added to the code A to update the previous ID code B stored in the first storage unit 13a (step 104). Next, when the arming key 11 or the disarming key 12 is pressed, I
Data including the D code A and the updated ID code B will be transmitted. When the data from the transmission unit 1 has not reached the security reception unit 2, the data from the security reception unit 2 is not returned in step 103. Therefore, the transmission unit 1 is operated again to operate in step 102. Repeat the process.

In FIG. 3, the security control unit 23 in the security receiving unit 2 according to the present invention has an ID code B.
Is a flow chart for setting ID. The setting process of the ID code B will be described with reference to this flow chart. When the security control unit 23 receives, for example, a disarming command signal for stopping the security operation from the transmission unit 1 via the reception antenna 21 and the second reception unit 22 (step 20).
1), I included in the received disarming command signal
D code A, ID code B and second storage unit 23a
The comparison determination unit 23b compares and determines the ID code A and the ID code B stored in (step 202), and if they match, the received disarming command signal is sent to the operation control unit 23d, While stopping the security operation, the security code is also sent to the second ID code setting section 23c, a predetermined random coefficient is added to the ID code A to obtain a new ID code, and the ID code stored in the second storage section 23a. B is updated to the new ID code B (step 203).

At the same time, the security control section 23 updates the ID code B of the transmission unit 1 with the ID code A.
Data including the second modulation circuit 24 and the second transmission circuit 2
5 and the transmitting antenna 26 (step 204). If the ID codes do not match in step 202, disarming is prohibited (step 20).
5).

FIG. 4 is an explanatory diagram showing the setting of the ID code B according to the present invention, and the setting of the ID code B will be described in detail based on this explanatory diagram. Referring to FIG. 4, in the transmission unit 1, when the disarming key 12 is pressed, for example, at the (n + 2) th time, the control unit 13 causes the ID code A (11111) and the ID code B (11114) corresponding to the disarming key 12. Output data including.
The ID code B (11114) is set when the data including the ID code A transmitted from the security receiving unit 2 is received at the (n + 1) th time.

That is, when the data is received from the security receiving unit 2, the remote controller control section 13 causes the first ID code setting section 13b to send the ID code A (1111).
The random coefficient (3) is added to 1) to set a new ID code B as (11114), and the first storage unit 13a
The previous ID code B stored in is updated.

On the other hand, in the security receiving unit 2, the security control unit 23 controls the transmitting units 1 to n.
When the + 2nd disarming command signal is received, I
The random coefficient (1) is added to the D code A (1111
2) The ID code B is set as the second storage unit 23a.
The previous ID code B stored in is updated.

In the embodiment, the in-vehicle security device is mentioned, but it can be applied to a home security device. Further, the transmission / reception may be optical, wired, or the like in addition to wireless as a medium.

[0029]

As described above, according to the present invention, there is provided a security device for transmitting and receiving data between a transmitting unit and a security receiving unit, wherein the transmitting unit and the security receiving unit are fixed ID codes, respectively. The transmission unit includes a storage unit that stores a variable ID code and a predetermined coefficient, and the transmission unit transmits the data including the fixed ID code and the variable ID code to the security reception unit, and the data that receives the data from the security reception unit. When data is received from the receiving unit and the security receiving unit after data transmission, a new variable ID code is calculated by adding a predetermined coefficient to the fixed ID code, and the variable ID stored in the storage unit is obtained.
The security receiving unit has a data setting unit for updating the code to the new variable ID code, and the security receiving unit stores the fixed ID code and the variable ID code of the received data, and the data receiving unit. A data comparison / determination unit that compares the fixed ID code and the variable ID code stored in the unit, and an operation control unit that starts or stops a predetermined security operation according to the content of the received data when the codes match. , A data setting unit for adding a predetermined coefficient to the fixed ID code to obtain a new variable ID code when the codes match, and updating the variable ID code stored in the storage unit to the new variable ID code. , And the data transmission unit that transmits the data including the fixed ID code to the transmission unit when the respective codes match, Even if the transmission data is copied with a stick by a stick, the security device is not disarmed, and the transmission data signal does not change even if the owner of the transmitter pushes the transmitter. This has the effect of preventing signal updates.

[Brief description of drawings]

FIG. 1 is a block diagram of essential parts showing an embodiment of a security device according to the present invention.

2 is a flow chart in which a control unit of the transmission unit of FIG. 1 sets a variable ID code.

3 is a flow chart in which a security control unit of the security receiving unit of FIG. 1 sets a variable ID code.

FIG. 4 is an explanatory diagram showing an example of setting a variable ID code according to the present invention.

[Explanation of symbols]

 1 Transmitting Unit 13 Control Unit 13a First Storage Unit 13b First ID Code Setting Unit 14 First Modulating Circuit 15 First Transmitting Circuit 17 First Receiving Unit 2 Security Receiving Unit 22 Second Receiving Unit 23 Security Control unit 23a Second storage unit 23b Comparison control unit 23c Second ID code storage unit 23d Operation control unit 24 Second modulation circuit 25 Second transmission circuit 3 Detection unit 4 Anti-theft unit

Claims (2)

[Claims] 1. A security device for transmitting and receiving data between a transmission unit and a security reception unit, wherein the transmission unit and the security reception unit each include a storage unit for storing a fixed ID code, a variable ID code and a predetermined coefficient. The transmission unit includes a data transmission unit that transmits data including a fixed ID code and a variable ID code to the security reception unit, a data reception unit that receives data from the security reception unit, and a data reception unit that transmits data from the security reception unit. Fixed ID when receiving
The security receiving unit includes a data setting unit that adds a predetermined coefficient to the code to obtain a new variable ID code, and updates the variable ID code stored in the storage unit to the new variable ID code. A data receiving unit for receiving data from the unit and a fixed I of the received data
A data comparison / determination unit that compares the D code and the variable ID code with the fixed ID code and the variable ID code stored in the storage unit, and performs a predetermined security operation according to the content of the received data when the codes match. When the respective codes match with the operation control unit to be started or stopped, a predetermined coefficient is added to the fixed ID code to obtain a new variable ID code, and the variable ID code stored in the storage unit is converted to the new variable ID code. A data setting part that updates to the code,
A security device, comprising: a data transmission unit that transmits data including a fixed ID code to a transmission unit when the codes match. 2. The predetermined coefficient is a random coefficient.
The described security device.