JPH08124047A - Security system - Google Patents

Abstract

PURPOSE: To improve the antitheft properties of a burglar preventing device. CONSTITUTION: The ID code received from a transmission unit 1 is identical with a rolling code that is changed at each time. A security control part 23 of a security reception unit 2 performs its operation in response to the rolling code and also includes an old code storage part 23e which stores the unupdated ID codes. Therefore, if a person planning theft copies the ID code that is precedently transmitted by a copying device and transmits it, a comparison/decision part 23b decides no coincidence of ID codes to reject reception of a security operation command and also performs the comparison with an old code to decide a copied code. Thus an alarm is produced by the blinking of a light or the blowing a siren. It is possible to cope with plural past ID codes by increasing the storage capacity of the part 23e.

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 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 a door of the automobile, giving a considerable shock to the automobile, or a trunk to steal the automobile during a security operation. When you open, the siren sounds, the headlights of the car blink, and the starter cut is done to prevent the engine from starting, or the fuel is cut to prevent the car from running and theft is prevented. .

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

In a security device using such a transmission unit, the transmission data of the transmission unit has a predetermined ID (identification) code, and the security device main body having the same ID code as the ID code is mounted. You can only arm or disarm the car. Therefore, since the transmission units having different ID codes cannot perform arming and disarming, the transmission unit has a special function of preventing the theft of the vehicle.

However, in such an apparatus, if a copying apparatus such as a learning remote controller is used during disarming by a regular transmitting unit and the transmission data is copied, a transmitting unit similar to the real one can be copied. Therefore, as a countermeasure against this, a technology has been put into practical use in which the ID code is automatically changed each time it is transmitted so that the copying apparatus is not useful even if it is copied.

[0006]

In the rolling code method in which the ID code is automatically changed each time it is transmitted, even if the transmission data is copied as described above, the ID code to be transmitted next is Because it ’s another
Although the duplicator has the effect of not being useful,
It was nothing more than that. That is, even if the copied transmission data is received, the ID code is not accepted on the side of the vehicle on which the security device body is mounted. In order to further enhance the security of the security device, the present invention attempts to improve the anti-theft property of the device by warning that someone is trying to steal a car.

[0007]

According to the present invention, in the rolling code type security device in which the ID code is automatically changed each time it is transmitted, the security receiving unit has the previously received ID code. Alternatively, the old code storage unit that stores a plurality of ID codes received a plurality of times before the previous time and the received ID code are
A comparison determination unit, which is updated based on a predetermined rule, compares and determines with a regular ID code stored in the storage unit, and if they do not match, a comparison determination unit that determines and compares with the old code stored in the old code storage unit is received. An alarm is issued when the ID code is compared and judged by the comparison and judgment section with the regular ID code stored in the storage section, and the ID code does not match with the old code stored in the old code storage section. And a motion control unit for operating the means.

[0008]

When receiving the predetermined data from the transmitting unit, the comparison / decision unit of the security receiving unit of the security device compares and judges the received ID code with the regular ID code based on the predetermined law stored in the storage unit. , If a match is found, a predetermined security operation is started or stopped depending on the contents received, but if they do not match, the acceptance is rejected, and the old code stored in the old code storage section is compared and judged to determine whether it is the old code. When the match of is confirmed,
A signal is sent to the operation control unit that activates the alarm means, and the operation control unit issues an alarm such as blinking of a light or blowing of a siren.

The old code storage unit stores the previously received ID code, but if the memory capacity is increased to store a plurality of previous codes, the probability of further detection and alarming of the theft can be increased. Can be increased.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing an embodiment of a security device according to the present invention. Reference numeral 1 is a portable transmission unit (remote control unit), which is a command signal for arming or disarming when a key is pressed. Can be transmitted to the security receiving unit mounted on the vehicle. Reference numeral 11 is an arming key, and 12 is a disarming key.

Reference numeral 13 denotes a control unit, which stores a fixed code and a variable code in advance each time the storage unit 13a, the arming key or the disarming key 12 is pressed.
A first variable code is added to the variable code stored in the storage unit 13a after shifting the variable code by a predetermined number of shifts and then added to the variable code shifted according to the transmission timing, and the previous variable code is updated to the new variable code. Has a code updating unit 13b, an ID code setting unit 13c for setting an ID code composed of a fixed code and a variable code stored in the storage unit 13a, and predetermined data including the ID code according to each key. Is generated and output.

FIG. 2 shows an example of the transmission data structure. In this configuration example, the first block has an 8-bit fixed code and the second block has a second code.
An 8-bit variable code is arranged in the block, and 8-bit commands corresponding to the ID code, the arming key 11 and the disarming key 12 are added as a third block during transmission.

FIG. 3 is an example of variable code setting in the transmission unit 1. In this example, when the arming key 11 or the disarming key 12 of the transmission unit 1 is pressed, the variable code (101100) previously stored in the storage unit 13a at the time of the first transmission of the transmission unit 1 is performed.
01) is transmitted, at the time of the second transmission, in this example, it is shifted to the right by 1 and the shifted most significant bit is added with a timing code 0 to be described later.
000). After that, the above processing is repeated at the time of transmission.

FIG. 4 shows an example of the timing code setting added to the variable code in the transmission unit 1. Referring to the figure, when the arming key 11 or the disarming key 12 of the transmission unit 1 is pressed, the key input is changed from L (Low) to H (High), and when released, it is again L. Then, this key input section is sampled at a predetermined cycle from the time of pressing, and when H, 1 is output as sampling data, and when L, 0 is output. In this example, the 1/0 toggle flag is set corresponding to the sampling data, and if the key is continuously pressed, the 1/0 toggle flag is inverted. That is, if the sampling data is 1 at the first sampling point, the initial value 0 of the 1/0 toggle flag is inverted and becomes 1. Further, since it is pressed at the next second sampling point, 1 at the first sampling point is inverted and becomes 0. Since the key is released at the tenth sampling point, the sampling data becomes 0, the preceding 1/0 toggle flag 1 is not inverted, and the data is transferred as it is. The 1 of the 1/0 toggle flag becomes the timing code.

Reference numeral 14 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 control unit 13. Reference numeral 15 denotes a transmission that generates a carrier wave of a predetermined frequency, modulates the carrier wave by a modulation circuit 14 to generate a modulated signal, and amplifies the modulated signal by power and radiates a radio wave by a loop type antenna 16 connected to an output side. Circuit.

2 is a security receiving 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 security is achieved in response to the arming command signal from the transmission unit 1 in the acceptable state. The operation is started, (2) the security operation is stopped by receiving the disarming command signal, and (3) the anti-theft operation is performed when the theft operation by the thief is detected in the security operation state.

Here, each component of the security receiving unit 2 will be described. Reference numeral 21 is a receiving antenna, and 22 is a receiving unit for receiving and demodulating a signal sent from the transmitting unit 1. Reference numeral 23 denotes a security control unit, which starts a security operation in response to an arming command signal sent from the transmission unit and stops the security operation based on the disarming command signal.
When the theft operation is detected in the security operation state, the theft prevention operation is performed. The arming command signal or the disarming command signal from the transmitting unit 1 includes an ID code, and the ID code is compared with the ID code of the receiving unit. As a result, if the ID codes match, the ID code can be accepted and the security operation is started or stopped. It also stops the anti-theft operation.

The structure of the security control section 23 will be described in detail. The storage section 23a for storing a fixed code and a variable code, the fixed code in the ID code and the variable code of the received data in the storage section 23a. Comparison determining unit 23 for comparing and comparing the stored fixed code and variable code
b, the operation control unit 23c that activates or stops a predetermined security operation according to the content of the received data when the fixed code and the variable code of the predetermined portion match as a result of the comparison determination of the comparison determination unit 23b, the fixed code And a variable code received when the variable code of the predetermined portion is respectively matched by a predetermined shift number after adding a predetermined code to the shifted variable code and update the previous variable code to the new variable code, When the variable code received at a predetermined portion does not match, the received variable code is shifted by a predetermined shift number, a predetermined code is added to the shifted variable code, and the previous variable code is updated to the new variable code. Code updating unit 23d
Is provided.

Further, the security control unit 23 is provided with an old code storage unit 23e for storing the variable code and the fixed code before the update.

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 includes a light driver 41 for blinking the headlight by a blink drive signal BLD output from the security control unit 23 when an abnormality is detected by each sensor during a security operation, and a siren drive signal SDR. It has a siren driver 42 that sounds.

FIG. 5 shows the security device I according to the present invention.
FIG. 3 is a diagram for explaining the D code setting process. The setting process of the ID code of the transmitting unit 1 and the receivable code of the security receiving unit 2 in the security device of FIG. First, when the user presses the arming key 11 or the disarming key 12 of the transmission unit 1, the ID code setting unit 13c of the control unit 13 of the transmission unit 1 causes the storage unit 13a to store a fixed code (10101010) and a variable code ( 10110001) is taken in and an ID code consisting of a fixed code and a variable code is set. Therefore, the control unit 13 adds the command code corresponding to the key to the transmission data by adding the variable ID code to the transmission data through the modulation circuit 14, the transmission circuit 15, and the loop antenna 16 as described in FIG. It transmits to the receiving unit 2.

Therefore, the security control unit 23 of the security receiving unit 2 has the receiving antenna 21 and the receiving unit 22.
When the transmission data from the transmission unit 1 is received via the, the comparison / determination unit 23b of the security control unit 23 determines that the fixed code (10
101010), a variable code (*******) is introduced, and comparison / determination processing with each code in the received transmission data is performed. However, at the first time, the variable codes are regarded as coincident without being compared and judged. In addition, the security receiving unit 2
After reading the first variable code, the security control unit 23 shifts to the right by one digit and adds 0 or 1 to the most significant bit. Here, it is set to (*).
Then, the previous variable code (*********) stored in the storage unit 23a is replaced with a new variable code (* 1011).
000). Hereinafter, the same update process is repeated each time it is transmitted.

The ID code before the above-mentioned update processing, that is, the fixed code (10101010) and the variable code (*********) are input and stored in the old code storage section 23e of the security control section 23. To be done.

Here, the comparison / determination unit 23b causes the storage unit 2 to operate.
When the fixed ID code and the variable code fetched from 3a match the fixed ID code and the variable code of the transmission data, they can be accepted. However, in the variable code, bits other than the most significant bit are subject to comparison determination. That is, for example, 2
At the first time, the variable code from the transmission unit 1 is (0101
Since it is 1000), the comparison determination is performed with 7 bits (1011000) excluding the most significant bit (0) and 7 bits (1011000) excluding * of the receivable code (* 1011000) of the security receiving unit 2.

Next, description will be given of a case where the button is pressed by the air. For example, if the fourth, fifth, and sixth presses are pressed and the normal transmission is performed on the seventh time, the variable code on the transmission side is (01011).
010). On the other hand, since the receiving side continues to store the variable code (* 1010110) transmitted for the third time, the comparison of the transmitting side variable code of 7 bits (101101
0) and the variable code on the receiving side are compared 7 bits (1010
110) is compared, and it is not accepted because it does not match.
However, since the fixed codes match, the security control unit 23 reads the received variable code, executes the shift process described above, and stores (* 0101) in the storage unit 23a.
101) is stored.

Then, when the key is pressed again to transmit (8th time), the variable code on the transmitting side is (001011).
01) is transmitted. Therefore, the comparison 7 bits (0101011) of the variable code on the transmitting side and the comparison 7 bits (0101011) of the variable code on the receiving side are compared, and since they match, they can be accepted. That is, no matter how many times the user presses the blank button, once the blank transmission is performed, the next transmission can be accepted.

Next, a transmission is copied and its copy I
A case where the D code is transmitted will be described. The security control unit 23 of the security receiving unit 2 shifts to the right by one digit after reading the n-th variable code, adds an arbitrary bit of 0 or 1 to the most significant bit, and stores in the storage unit 23a.
Since the previous variable code stored in the new variable code is updated to the new variable code, even if the nth transmission is copied and the copy ID code is transmitted as the (n + 1) th transmission, it is not accepted, and the comparison determination unit 23b Compares whether or not the received ID code is the previous one with the one read from the old code storage unit 23e, and if the same as the previous one,
If the vehicle is stolen, a signal is sent to the operation control unit 23c, and the operation control unit 23c causes the light driver 41 to blink the headlight by the blink drive signal BLD or the siren driver 4 by the siren drive signal SDR.
2 sounds a siren and warns the surroundings.

FIG. 6 is a flow chart of processing of the security control unit 23 in the security receiving unit 2 according to the present invention. The operation of the security receiving unit 2 will be described with reference to FIG. Depending on the user, for example the transmission unit 1
If the arming key 11 or the disarming key 12 is pressed, the transmission data is transmitted from the transmission unit 1, and the security control unit 23 of the security reception unit 2 receives the transmission data via the reception antenna 21 and the reception unit 22. Then, the comparison / determination unit 23b of the security control unit 23 reads the fixed ID code, the variable code, and the command code in the transmission data (Step 102).

Therefore, the comparison / determination unit 23b determines whether or not the read fixed code matches the fixed code stored in the storage unit 23a (step 1).
03) If they match, the read variable code is subjected to predetermined shift processing and stored in the storage section 23a (step 104). Next, the predetermined variable between the previous variable code and the received variable code is compared and determined (step 105). If they match, the previous variable code in the storage unit 23a is newly stored and the shifted variable is stored. The code is updated and a security operation command corresponding to the command code is output (step 106).

If the fixed code in the transmission data does not match the fixed code stored in the storage unit 23a in step 103, the security operation command is not accepted (step 107). If the variable code in the transmission data does not match the variable code subjected to the shift processing stored in the storage unit 23a in step 105,
The previous variable code is updated to a new variable code (step 108), the process returns to step 101, and the same processing is performed thereafter.

Further, as described above, when the variable code in the transmission data and the variable code subjected to the shift processing stored in the storage section 23a do not match in step 105, the processing of the preceding paragraph is performed and Then, it is checked whether or not it matches the code used for the previous transmission stored in the old code storage unit 23e (step 109).
As a result, if they do not match, the security operation command is not accepted (step 107).
If they match, it is determined that the code has been copied and stealing is planned, and the light is blinked and the siren is blown (step 110).

Therefore, when the transmission data signal is copied and transmitted by the duplication device by the thief, not only the security operation command is not accepted, but also an alarm is given to the surroundings, so that the thief cannot cancel the security device. It disappears and runs away quickly.

In the embodiment, the in-vehicle security device is referred to, but it is also applicable to a home security device or the like. Also, transmission / reception may be wireless, optical, or wired as a medium. Although the fixed code and the variable code are 8 bits, the number of bits is not limited to 8 bits.

Further, as long as the memory capacity is possible, the old code storage unit stores a plurality of previously used ID codes retroactively from the previous time and compares them, or compares them with each other, or inversely calculates the rolling code to obtain the past code. If the ID code is calculated, the anti-theft property can be further improved.

[0035]

As described above, according to the present invention, a rolling code type security device, which has conventionally only copied transmission data and does not accept it even if it is transmitted, has a previous or previous ID. Remember the code,
If the ID code does not match at the time of data reception, the acceptance is rejected and the old ID stored in the old code storage unit is rejected.
When comparing with the code and confirming the match with the old code, it is supposed that there is a thief, and flashes the light, drives the horn, siren, etc. to issue an alarm, so it is great for those who think about theft. It becomes a threat and the anti-theft property is greatly improved.

[Brief description of drawings]

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

FIG. 2 is an example of a transmission data structure in the transmission unit 1 of the present invention.

FIG. 3 is an example of variable code setting in the transmission unit 1 of the present invention.

FIG. 4 is an example of timing code setting added to a variable code in the transmission unit 1 of the present invention.

FIG. 5 is an explanatory diagram illustrating a process of ID code setting of the security device of the present invention.

FIG. 6 is a flow chart of processing of a security control unit 23 in the security receiving unit 2 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 sending unit 13 control part 13a storage part 13b 1st code update part 13c ID code setting part 2 security receiving unit 22 receiving part 23 security control part 23a storage part 23b comparison judgment part 23c operation control part 23d second code updating part 23e Old code storage unit 3 Detection unit 4 Anti-theft unit

Claims (1)

[Claims] 1. A rolling code type security device in which an ID code is automatically changed each time the ID code is transmitted.
Code or multiple I's received retroactively from previous multiple times
The old code storage unit that stores the D code and the received ID code are compared and determined with the regular ID code that is updated based on a predetermined rule and stored in the storage unit. If they do not match,
The comparison / determination unit that determines the comparison with the old code stored in the old code storage unit, and the received ID code is compared and determined by the comparison determination unit with the regular ID code stored in the storage unit. A security device, comprising: an operation control unit that activates an alarm means when it is determined that the existing code matches the old code stored in the old code storage unit.