JP2812877B2 - Vehicle anti-theft device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing a vehicle from being stolen, and more particularly to a device for preventing a vehicle from escaping.

[0002]

2. Description of the Related Art Methods for preventing theft of an automobile include, for example, a method for preventing intrusion into a vehicle, a method for locking a steering wheel to make steering impossible, and a method for making starting of an internal combustion engine impossible. . However, in the method of preventing intrusion into the vehicle, the intrusion into the vehicle by, for example, prying the door open or breaking the glass is detected by using, for example, a glass break sensor, and an alarm is issued to prevent the intrusion. However, if the door is opened, there is a risk of being easily evacuated.

As a method for preventing such escape, it is effective to disable the internal combustion engine. As a first prior art of such a method, there is, for example, Japanese Patent Application Laid-Open No. 4-1544. This prior art,
The anti-theft computer controls the relay interposed in the ignition coil line to shut off, thereby preventing the internal combustion engine from starting.

A second prior art is disclosed in Japanese Patent Laid-Open No.
31647. In this prior art, the starting of the internal combustion engine is prevented by a control device for preventing theft from intercepting a relay interposed in a power supply line from a battery to a load.

[0005] Therefore, in these two prior arts, the start of the internal combustion engine is disabled by shutting off the relay interposed in the load line. Therefore, a large and expensive relay, particularly the first prior art, requires an expensive relay for high voltage interposed in the ignition coil line, which increases the cost. Further, a person familiar with the vehicle can easily disable the anti-theft function by short-circuiting the input and output of the relay.

As a third prior art for solving such a problem, there is Japanese Patent Application Laid-Open No. Sho 63-284054. In this prior art, the internal combustion engine is stopped when a shift operation is performed without sitting on the driver's seat where the seat is folded down, or when a shift operation is performed without input of an identification code. is there.

Similarly, Japanese Patent Application Laid-Open No. 2-164648 is a fourth prior art. In this prior art, in order to prevent theft due to forgetting to remove a key, after a lapse of a predetermined time from the stop of the internal combustion engine, the internal combustion engine is started by inputting a password.

[0008] Thus, the third and fourth prior arts include:
As in the above-described first and second prior arts, the control operation of the control device itself is stopped without intervening a relay by a so-called retrofit to a control device or the like of the internal combustion engine already prepared. It will be.

[0009]

However, in the third and fourth prior arts described above, a dedicated microcomputer is used for collation of the identification code, and only when the collation results match, the microcomputer is used. The computer is configured to transmit a binary signal permitting start to a computer for controlling the internal combustion engine. Therefore, if the person is familiar with the vehicle, the line for transmitting the permission signal is generated in a pseudo manner, for example, by grounding the Vcc line of 5 V or the ground line to the ground line. Thus, the internal combustion engine can be started.

[0010] In the configuration in which the identification code is transmitted from the transmitter, the identification code of the receiver or the identification means is changed so as to cope with loss or damage of the transmitter.
It must be re-writable in response to a new transmitter. As a fifth prior art for realizing such a problem, Japanese Patent Application Laid-Open No. 3-70299 proposed earlier by the present applicant has been proposed.
Is mentioned. In this prior art, the writing operation and the reading operation of the identification code are switched according to the operation time of the switch on the receiver side.

A sixth prior art in which the identification code can be rewritten is disclosed in Japanese Patent Laid-Open No. 5-106375. In this prior art, an identification code can be rewritten by an input operation from an input unit when an ignition switch is turned on.

Therefore, in the fifth prior art, a switch is required to enable rewriting, and in the sixth prior art, there is a problem that the identification code can be easily rewritten.

An object of the present invention is to provide an anti-theft device for a vehicle which can reliably prevent theft of a vehicle and can surely rewrite an identification code with a simple structure.

[0014]

SUMMARY OF THE INVENTION The present invention relates to a control means for controlling an operation state of an internal combustion engine, a storage means having a storage area for data relating to the control and an identification code storage area, Input means for inputting a code, wherein the control means outputs a signal for controlling an operation state of the internal combustion engine based on the data relating to the control, and an identification code input from the input means; The identification code stored in the storage means is compared with the identification code input from the input means, and the internal combustion engine is not started when they do not match. This is a vehicle anti-theft device that is executed again when stopped.

According to the present invention, there is provided control means for controlling an operation state of the internal combustion engine, storage means having a storage area for data relating to the control and a storage area for an identification code, and an identification code being inputted by a predetermined operation. Input means, wherein the control means outputs a signal for controlling an operation state of the internal combustion engine based on the data relating to the control, and an identification code input from the input means and stored in the storage means. When the vehicle speed is equal to or greater than a predetermined value, the internal combustion engine is permitted to start regardless of the comparison result of the identification code. This is a vehicle anti-theft device.

According to the present invention, a control means for controlling an operation state of the internal combustion engine, a storage means having a storage area for data relating to the control and a storage area for an identification code, and an identification code are inputted by a predetermined operation. Input means, wherein the control means outputs a signal for controlling an operation state of the internal combustion engine based on the data relating to the control, and an identification code input from the input means and stored in the storage means. The ID code is compared with the ID code. If the ID codes do not match, the internal combustion engine is not started, and the ID code input from the input means and the ID code stored in the storage means are compared again when the vehicle is stopped. ,
An anti-theft device for a vehicle, wherein when the vehicle speed is equal to or higher than a predetermined value, start of the internal combustion engine is permitted regardless of the comparison result of the identification code.

Further, the present invention provides a control means for controlling an operation state of the internal combustion engine, a storage means for storing an identification code, an input means for inputting an identification code by a predetermined operation, and an input means for inputting the identification code from the input means. Starting control means for comparing the identification code with the identification code stored in the storage means so as not to start the internal combustion engine when they do not match, the control means fetching a signal indicating an operating state of the vehicle; Outputting a signal for controlling the operation state of the internal combustion engine based on the operation state of the vehicle, and when the operation state of the vehicle captured by the control means cannot be normally generated, the identification input to the input means. An anti-theft device for a vehicle, wherein a code is written in a storage area of the identification code of the storage means.

[0018]

According to the present invention, the operating state of the internal combustion engine is controlled,
For example, input means is provided in connection with control means for controlling a fuel injection amount, an ignition timing, and the like. An identification code is input to this input means by, for example, a signal from a dedicated transmitter or key operation. In addition to the control means, a storage means for storing data relating to the control, for example, map data of an injection amount corresponding to the measured intake pressure and the rotation speed of the internal combustion engine, and the like is provided. This storage means is provided with a storage area for the identification code as well as a storage area for the data.

The control means compares the identification code input via the input means with the identification code stored in the storage means, and when they match, permits the start of the internal combustion engine,
An internal combustion engine can be started by starting a starter motor or the like. On the other hand, when the identification codes do not match each other, the start of the internal combustion engine is disabled, for example, by stopping the fuel injection or stopping the output of the ignition signal.

Therefore, instead of the binary signal for permitting or not starting as described in the prior art, the control device
Since the identification code is input and compared with the identification code in the storage means related to the control device, even a person who is familiar with the vehicle cannot create a pseudo signal corresponding to the identification code. Thus, when the identification codes do not match, the starting of the internal combustion engine can be reliably prevented to prevent theft.

The control means determines the comparison operation when the vehicle is stopped, for example, when the rotational speed of the internal combustion engine is a predetermined value.
For example, when the vehicle speed is equal to or less than 800 rpm, the vehicle body speed is a predetermined value, for example, 0 km / h, and the gear position of the transmission is in the neutral or parking position, the operation is performed again. Therefore, even if an erroneous determination is made at the time of starting and the start of the internal combustion engine is prohibited, if the identification code matches as a result of the re-determination in a state where the above conditions are satisfied, the internal combustion engine can be started, and the fail-safe operation can be performed. Functions can be expanded.

When the vehicle speed is equal to or higher than a predetermined value, the control means permits the start of the internal combustion engine regardless of the comparison result of the identification code. Therefore, the internal combustion engine can be quickly restarted at the time of engine stall during running.

[0023] The control means may be adapted to, for example, turn off the neutral switch when the operation state of the vehicle taken by the control means cannot be normally generated during the normal operation of the internal combustion engine.
When the starter signal is at a high level, that is, the starter motor is started, in a running state, that is, when the starter motor is started, the input is given to the input means when such an input is given to the control means. The identification code is written in the storage means as it is.

Therefore, rewriting due to loss of the transmitter or the like can be performed with a simple configuration without providing a switch or the like in the control means, and inadvertent writing is prevented to prevent theft reliably. can do.

[0025]

FIG. 1 is a block diagram showing an electric configuration of a vehicle control device 1 according to an embodiment of the present invention having a theft prevention function. The vehicle control device 1 generally includes an internal combustion engine control unit 3 that controls the internal combustion engine 2, an automatic transmission control unit 5 that controls the automatic transmission 4, and a door lock control unit 6. ing.

The internal combustion engine control unit 3 is generally based on the intake pressure of the internal combustion engine 2 detected by the intake pressure detector 11, the rotational speed of the internal combustion engine 2 detected by the crank angle detector 12, and the like. The fuel injection amount and the ignition timing are calculated, and the fuel injection valve 13 and the igniter 14 are driven. The internal combustion engine control unit 3 includes an input interface circuit 1
5 to 19, an analog / digital converter 8, a processing circuit 7 realized by a microcomputer or the like, a memory 20 realized by a so-called EEPROM capable of erasing and rewriting, output interface circuits 21 and 22, and the like. It is comprised including.

The output from the intake pressure detector 11 is converted into a digital value by an analog / digital converter 8 and read into a processing circuit 7. The crank pulse from the crank angle detector 12 is input to the processing circuit 7 after being shaped by the input interface circuit 17. The input interface circuit 15 is provided for receiving a signal from the door lock control unit 6, and the input interface circuit 16 is provided for receiving a signal from the automatic transmission control unit 5.

Outputs from the neutral switch 9 and the start switch 10 are input to the processing circuit 7 after waveform shaping by input interface circuits 18 and 19, respectively. The neutral switch 9 is connected to the automatic transmission 4
When the gear position of the vehicle reaches the parking or neutral position, the conduction is established. The start switch 10 is turned on during a period in which the starter motor is started.

The processing circuit 7 stores the data in the memory 20 based on the signals indicating the operating state of the vehicle, the detection results of the switches 9 and 10, the detectors 11 and 12, the signal from the automatic transmission control unit 5, and the like. The fuel injection amount and the ignition timing are calculated with reference to the map data and the like stored in the area 20a, and the fuel injection valve 13 is opened via an output interface circuit 21 realized by a power transistor or the like. In addition to controlling the time, the ignition timing and the ignition time of the ignition plug 23 are controlled via the igniter 14.

The memory 20 also has the storage area 20a
And a storage area 20b, and an identification code is stored in the storage area 20b.

The automatic transmission control section 5 generally responds to the detection results of the throttle valve opening detector 25, the vehicle speed detector 26, and the shift position detector 27, in accordance with the detection results of the solenoid valve 28 of the automatic transmission 4. Is selectively driven, and the driving force from the internal combustion engine 2 is reduced at a desired reduction ratio and transmitted to the wheels 29. The automatic transmission control unit 5 includes input interface circuits 30 and 31, an analog / digital converter 32, a processing circuit 33, a memory 34, and output interface circuits 35 and 36. .

The vehicle speed detector 26 detects the rotation speed of the propeller shaft 37. The speed pulse from the vehicle speed detector 26 is shaped by an input interface circuit 31 and then realized by a microcomputer or the like. Is input to the processing circuit 33. The gear position of the automatic transmission 4 is read by the shift position detector 27 and input to the processing circuit 33 via the input interface circuit 30. Further, the detection result of the throttle valve opening detector 25 realized by a potentiometer or the like is input to the processing circuit 33 after being converted into a digital value by the analog / digital converter 32.

The processing circuit 33 is based on the shift position detected by the shift position detector 27, the throttle valve opening detected by the throttle valve opening detector 25, and the vehicle speed detected by the vehicle speed detector 26. An optimal shift speed is read from a shift diagram stored in a memory 34 realized by a read-only memory or the like, and a solenoid is connected via an output interface circuit 35 realized by a power transistor or the like so as to achieve the shift speed. The switching control of the valve 28 is performed.

The signal is supplied from the processing circuit 33 to the input interface circuit 16 of the internal combustion engine control unit 3 via an output interface circuit 36 and a line 38. This signal is a signal representing the vehicle speed and the shift timing, as described later. Internal combustion engine control unit 3
In order to reduce the shift shock, for example, the ignition timing is temporarily delayed in accordance with the shift timing.

The door lock controller 6 causes the receiver 42 to drive the door lock actuator 43 in response to a signal from the transmitter 41. Further, the receiver 4
2 detects the theft by the switches 44 and 45,
An anti-theft operation is performed in which the horn 46 is sounded and the stop indicator 47 is flashed.

The transmitter 41 includes a push button switch 51,
The transmission circuit 52 and the memory 53 are included. When the push button switch 51 is operated, the transmission circuit 52
Reads an identification code unique to the transmitter 41 from a memory 53 realized by a read-only memory or the like, and transmits a signal representing the identification code to the receiver 42 using a frequency-modulated wave, an amplitude-modulated wave, or infrared rays. .

The receiver 42 includes a receiving circuit 54, input interface circuits 55 to 59, a processing circuit 50, a memory 60, and output interface circuits 61 and 62. The signal representing the identification code received by the receiving circuit 54 is input to a processing circuit 50 implemented by a microcomputer or the like after being shaped by an input interface circuit 55. The processing circuit 50 stores the identification code in a memory 6 implemented by an EEPROM or the like.
It is determined whether or not the identification code matches the identification code of the vehicle stored in 0, and when the identification code matches, the actuator 43 realized by an electromagnetic solenoid or the like is driven via the output interface circuit 61. That is, the unlocking operation is performed when the door and the trunk are locked, and the locking operation is performed when the door and the trunk are unlocked.

The processing circuit 50 also includes a switch 6
Outputs from 3, 44, and 45 are input to input interface circuits 56, 57, and 58, respectively, from which chattering components and the like have been removed. With the set switch 63 turned on and the anti-theft function selected, the hood or door is detected to be opened by the hood switch 44 for detecting opening and closing of the hood or the courtesy switch 45 for detecting opening and closing of the door. Then, the processing circuit 50 blows the horn 46 and blinks the stop indicator 47 as described above. Thus, the anti-theft operation is performed.

The processing circuit 50 also sends an identification code from the output interface circuit 22 of the internal combustion engine control unit 3 to the input interface circuit 59 of the door lock control unit 6 via a line 71 as described later. Is input to the input interface circuit 15 of the internal combustion engine controller 3 via the output interface circuit 62 and the line 64 to output a signal representing the identification code.

Each of the control sections 3, 5, 6 is provided with a constant voltage circuit 67, 68, 69, respectively. An ignition key switch 65 is connected to the constant voltage circuit 67, 68 by an IG.
When the contact or the ST contact is conducted, the power from the battery 66 is supplied, the power from the battery 66 is constantly supplied to the constant voltage circuit 69, and each circuit in each of the control units 3, 5, 6 is energized. Is done.

FIG. 2 is a timing chart for explaining the anti-theft operation of the vehicle control device 1 configured as described above. As shown in FIG. 2A, when the ignition key switch 65 is turned on at the time t1 to the IG contact or the ST contact, the processing circuit 7 starts to operate as shown in FIG. Starts the initialization operation.

As a part of the initialization operation, the processing circuit 7
Is transmitted from the transmitter 41 when the door is unlocked and stored in the memory 6
The identification code stored in 0 is read via the line 64 as shown in FIG. It is determined whether the identification code matches the identification code stored in the storage area 20b of the memory 20 in advance. If the identification code does not match, the start inhibition flag F is set to 1 as shown in FIG. Set to. As a result, for example, the output of the injection signal and the ignition signal is prohibited, and the start of the internal combustion engine is prohibited.

The receiver 4 receiving the identification code as described above
2 transmits the identification code itself to the internal combustion engine control unit 3 via the line 64 instead of the determination result of whether the identification codes match, and stores the control data on the internal combustion engine control unit 3 side. Since the comparison is performed with the identification code stored in the memory 20 provided for the vehicle, even if the person is familiar with the vehicle, the identification code can be simulated by the line 64.
, And the vehicle can be reliably prevented from getting out of the vehicle.

FIG. 3 is a flowchart for explaining the above-described antitheft operation. When the ignition key switch 65 is turned on and the power supply voltage is stabilized, the process proceeds to step n1, and the processing circuit 7 performs an initialization process. At step n2, a request to read the identification code is transmitted to the door lock control unit 6 via the line 71. In step n3,
In response to the read request, the identification code transmitted from the door lock control unit 6 is read. At step n4, it is determined whether or not the read identification code and the identification code stored in the memory 20 match each other. If so, the flag F is reset to 0 at step n5. The operation is terminated, and if not, the flag F is set to 1 in step n6, and the process returns to step n2 and is repeated to request again the reading of the identification code.

FIG. 4 is a flowchart for explaining the anti-theft operation of another embodiment of the present invention. The operation shown in FIG. 4 is performed by interruption processing at predetermined time intervals while the internal combustion engine 2 is operating.

In step m1, the crank angle detector 12
From the detection result, it is determined whether or not the rotation speed Ne of the internal combustion engine 2 is equal to or less than a predetermined value, for example, 800 rpm. If so, the vehicle speed Vs input from the automatic transmission control unit 5 in step m2. Is determined to be a predetermined value, for example, 0 km / h, and if so, at step m3, the neutral detector 9
, It is determined whether or not the gear position of the automatic transmission 4 is at the neutral position. If so, the process proceeds to step m4.

When the vehicle that satisfies the conditions of steps m1 to m3 is stopped, the process proceeds to step m4, and a request to read the identification code is transmitted to the door lock control unit 6, as in step n2. In step m5, the identification code is read in the same manner as in step n3. In step m6, it is determined whether the identification code matches the identification code stored in the memory 20 as in step n4. If not, the flag F is set to 1 in step m7 to end the operation, and if so, the flag F is reset to 0 in step m8 to end the operation.

When at least one of the conditions of the steps m1 to m3 is not satisfied, that is, when there is a possibility that the vehicle is running, the flow proceeds to step m8 and the flag F is reset to 0. Is done.

Therefore, even if an erroneous determination is made during the determination operation shown in FIG. 3, the correct determination can be made by performing the determination operation shown in FIG. 4 after the interruption time has elapsed. The fail-safe function can be expanded. When the vehicle is running, the internal combustion engine 2
Therefore, even if the power is temporarily shut off during driving, for example, when the ignition key switch 65 is turned on from OFF to ON, there is no need to newly transmit the identification code from the transmitter 41, and Can be restarted.

The processing circuit 7 also has a test mode terminal 7
0 is provided, and the internal combustion engine control unit 3 can be inspected by conducting the test mode terminal 70. That is, the test mode terminal 70 is turned on at the time of shipping inspection at the manufacturer or at the time of failure diagnosis at the maintenance shop. In the present invention, when a predetermined operation is performed in a state where the test mode terminal 70 is turned on and the test mode is set, the identification code is written into the storage area 20b of the memory 20.

That is, the input interface circuit 18,
The writing state can be set by pseudo-input to 19 that the neutral switch 9 is OFF and the start switch 10 is ON.

FIG. 5 is a flowchart for explaining such an operation of writing the identification code. When the test mode terminal 70 is turned on to enter the test mode, the process proceeds to step k1, where it is determined whether the neutral switch 9 is turned off. If so, it is determined in step k2 whether the start switch 10 is turned on. Is determined,
If so, that is, if the switch input of a combination that is impossible during the actual running is simulated, the identification code can be written and the step k
Move to 3.

At step k3, the identification code is read through the input interface circuit 15, and thereafter, at step k4, the read identification code is written into the storage area 20b of the memory 20, and the process proceeds to step k5. If any of the conditions in steps k1 and k2 is not satisfied, the flow directly proceeds to step k5 to perform another test.

Therefore, if it becomes necessary to rewrite the identification code due to a failure of the internal combustion engine control unit 3 or a replacement due to loss or damage of the transmitter 6, etc., the identification code is executed by performing a predetermined operation after entering the test mode. And it is not necessary to provide a dedicated terminal or the like for setting the write mode in the processing circuit 7, and the identification code can be written with a simple structure. Also, careless rewriting by the user or the like can be prevented, and theft can be more reliably prevented.

[0055]

As described above, according to the present invention, the identification code is stored in the storage means provided in connection with the control means for controlling the operation state of the internal combustion engine together with the data relating to the control. The control unit compares the identification code obtained by the control unit with the identification code stored in the storage unit. Instead, it is determined whether or not to permit the start of the vehicle, but by comparing the identification codes by itself.

Therefore, even a person who is familiar with the vehicle cannot artificially give an input corresponding to the identification code to the control means, so that the vehicle can be reliably prevented from being stolen.

When the vehicle is stopped, for example, when the rotational speed of the internal combustion engine is a predetermined value, for example, 800 r
pm or less, the vehicle speed is a predetermined value, for example, 0 km / h, and the transmission is performed again when the gear position of the transmission is in the neutral or parking position.
Even if an erroneous determination is made at the time of the start to disallow the start of the internal combustion engine, as a result of the re-determination as a result of the re-determination in a state where the above conditions are satisfied, the start of the internal combustion engine becomes possible if the identification codes match, and the fail-safe function Can be expanded.

When the vehicle speed is equal to or higher than the predetermined value, the start of the internal combustion engine is permitted irrespective of the comparison result of the identification code, so that the internal combustion engine can be quickly restarted at the time of engine stall during running.

When an operation state which cannot occur during normal operation of the internal combustion engine is taken into the control means, the input identification code is written in the storage means as it is, so that the control means is not provided with a switch or the like. It is possible to rewrite the identification code with a simple configuration and to prevent inadvertent writing, thereby reliably preventing theft.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an electrical configuration of a vehicle control device 1 according to an embodiment of the present invention having an anti-theft function.

FIG. 2 is a timing chart for explaining the anti-theft operation.

FIG. 3 is a flowchart of FIG.

FIG. 4 is a flowchart illustrating an anti-theft operation according to another embodiment of the present invention.

FIG. 5 is a flowchart illustrating an operation of writing identification data.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 vehicle control device 2 internal combustion engine 3 internal combustion engine control unit 4 automatic transmission 5 automatic transmission control unit 6 door lock control unit 7, 33, 50 processing circuit 9 neutral switch 10 start switch 12 crank angle detector 20, 34, 53 , 60 memory 26 vehicle speed detector 41 transmitter 42 receiver 65 ignition key switch

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B60R 25/04 E05B 49/00 E05B 65/00 F02P 11/04

Claims (4)

(57) [Claims] A control means for controlling an operation state of the internal combustion engine; a storage means having a storage area for data relating to the control and a storage area for an identification code; and an input means for inputting an identification code by a predetermined operation. The control means, while outputting a signal for controlling the operating state of the internal combustion engine based on the data related to the control, the identification code input from the input means, the identification code stored in the storage means And comparing the identification code input from the input means with the identification code stored in the storage means, when the vehicle stops, re-executing the comparison. Vehicle anti-theft device. 2. A control means for controlling an operation state of an internal combustion engine, a storage means having a storage area for data relating to the control and a storage area for an identification code, and an input means for inputting an identification code by a predetermined operation. The control means, while outputting a signal for controlling the operating state of the internal combustion engine based on the data related to the control, the identification code input from the input means, the identification code stored in the storage means When they do not match, the internal combustion engine is not started, and when the vehicle speed is equal to or more than a predetermined value, regardless of the comparison result of the identification code,
An anti-theft device for a vehicle, wherein starting of an internal combustion engine is permitted. Control means for controlling an operation state of the internal combustion engine; storage means having a storage area for data relating to the control and a storage area for an identification code; and input means for inputting the identification code by a predetermined operation. The control means, while outputting a signal for controlling the operating state of the internal combustion engine based on the data related to the control, the identification code input from the input means, the identification code stored in the storage means When they do not match, the internal combustion engine is not started, and the comparison between the identification code input from the input means and the identification code stored in the storage means is executed again when the vehicle stops, and the vehicle speed When the value is equal to or greater than a predetermined value, the internal combustion engine is permitted to start irrespective of the comparison result of the identification code. Prevention device. A control means for controlling an operation state of the internal combustion engine; a storage means for storing an identification code; an input means for inputting the identification code by a predetermined operation; and an identification code input from the input means. Start inhibiting means for comparing the identification code stored in the storage means and not starting the internal combustion engine when they do not match, the control means fetching a signal indicating an operation state of the vehicle, A signal for controlling the operation state of the internal combustion engine is output based on the operation state of the internal combustion engine, and when the operation state of the vehicle captured by the control means cannot be normally generated, the identification code input to the input means is changed to the identification code. An anti-theft device for a vehicle, wherein the identification code is written in a storage area of an identification code of a storage means.