JP5123838B2 - Anti-theft device - Google Patents

Description

  The present invention relates to an anti-theft device for starting a driving source such as an engine of a vehicle, and more particularly to an apparatus having an ID authentication function called an immobilizer.

Conventionally, an anti-theft device called an immobilizer is known, for example, from Patent Document 1 as an anti-theft vehicle.
This apparatus includes an immobilizer provided on the key cylinder side of the vehicle and a response output unit called a transponder provided on the key side. When the key is inserted into the key cylinder, a transponder driving radio wave is output from the immobilizer, and a response output unit provided on the key side is generated by the transponder driving radio wave to output a response signal. In the immobilizer, the response signal is demodulated to obtain a unique code (referred to as an immobilizer ID code in this specification) of the response signal.
The anti-theft control unit verifies whether the immobility ID code matches the registered ID code stored in the storage unit in advance, and when the verification is established, unlocks the steering lock device or drives the engine or the like The anti-theft control that prohibited the start of the is released.
Therefore, collation is not established except for the regular key, and the vehicle is prevented from being illegally driven.

In such an anti-theft device, registration of the registration ID code is performed at the time of line-off from the factory, and this procedure will be described.
First, when the line is off, the storage unit on the vehicle side is initialized.
Therefore, when the line is off, the key is inserted into the key cylinder, and an operation for outputting a preset registration trigger (for example, turning on the ignition switch) is executed to output a transponder driving radio wave from the immobilizer. In the key, the response output unit receives the transponder drive radio wave, generates power by electromagnetic coupling, and outputs a response signal. Therefore, the immobilizer receives a response signal and acquires an immobilizer ID code.
In the registration control unit, the immobility ID code acquired from the response signal obtained first is written in the storage unit as the registration ID code. This storage section allows only one writing, prohibits subsequent writing, and holds the registration ID code.
JP 2004-36505 A

  Conventionally, the above-described immobilizer type antitheft device is generally a key type, and the key is inserted into the key cylinder so that the relative position between the key side and the vehicle body side is constant, and the ID code Sending.

  However, the inventors of the present application have found a new problem to be solved when considering application to a so-called portable device that is a portable key.

  That is, when performing ID collation with a portable device whose position relative to the vehicle body is uncertain, since the relative position between the immobilizer on the vehicle body side and the response output unit on the portable device side is uncertain, the transponder in the response output unit of the portable device The input state of the drive radio wave and the input state of the response signal in the immobilizer are not constant, and the immobilizer may not be able to normally acquire the immobilizer ID code from the response signal.

  In normal use, in such a case, it is possible to obtain the immobilizer ID code and perform collation by bringing the portable device close to the immobilizer and outputting the transponder drive radio wave again.

  However, as described above, the distance between the immobilizer and the portable device is too far away when executing the write registration process in which the immobilizer ID code is written in the storage unit as a registered ID code, such as when the vehicle line is off. If the ID code is not properly written in the storage unit due to improper orientation of both, it is necessary to replace the storage unit and start writing again, resulting in new costs and work. It was.

  The present invention has been made paying attention to the above-mentioned conventional problems, and even when a wireless portable device whose position with respect to the vehicle is uncertain is used, the writing at the time of the writing registration process in the registration control unit is performed. An object of the present invention is to provide an anti-theft device capable of preventing the occurrence of defects.

  In order to achieve the above-mentioned object, the present invention generates a power by receiving a transponder driving radio wave and outputs a response signal indicating a unique immobility ID code, and the transponder driving radio wave. While outputting, the immobilizer which receives the response signal transmitted from the portable device and acquires the immobilizer ID code indicated by the response signal, and the immobilizer ID code acquired by the immobilizer are registered in the storage unit in advance The ID code is collated. When the collation is established, the anti-theft control unit for canceling the anti-theft state, and the write registration process for writing the registration ID code in the storage unit are executed, and the write registration process is executed. A registration control unit that writes the immobility ID code acquired from the response signal received from time to time as the registration ID code in the storage unit And an anti-theft device comprising: an input state determination unit that determines whether or not an input state of the response signal is a state in which the write registration process can be performed when the write registration process is performed; The registration control unit outputs an immobility ID code obtained from the obtained response signal to the storage unit when the input state determination unit outputs the transponder driving radio wave when determining that the input state determination unit is in an executable state. The anti-theft device is characterized by being written as a code.

Furthermore, the invention according to claim 2 is the anti-theft device according to claim 1, wherein the input state determination unit measures the modulation degree of the ID signal, and the modulation degree is set in advance. The anti-theft device is characterized in that it is determined that it is in an executable state when it is larger than.
According to a third aspect of the present invention, in the antitheft device according to the first aspect, the input state determining means is configured to use a reference electric field strength in which the electric field strength is preset based on the electric field strength of the ID signal. The anti-theft device is characterized in that it is determined that it is in an executable state when it is larger than.
The invention according to claim 4 is the antitheft device according to any one of claims 1 to 3, wherein the registration control unit determines that the input state determination means is the executable state. In some cases, the anti-theft device is characterized by notifying the executable state by a notification means.

In the anti-theft device of the present invention, when executing the write registration process in which the storage unit stores the immobility ID code of the portable device assigned to the vehicle as the registration ID code, the input state determining means It is determined whether the input state of the response signal from is a state in which the write registration process can be executed. When the input state determination unit determines that the state is executable, the transponder signal is output, and the immobility ID code obtained from the response signal is stored in the storage unit as the registration ID code.
Therefore, in the present invention, the writing to the storage unit is executed only when the input state of the response signal in the immobilizer is appropriate, for example, the portable device is too far away from the immobilizer or the orientation is inappropriate, Is not appropriate, the registration ID code is not written to the storage unit.
Therefore, even in the case of a wireless portable device, it is possible to prevent the occurrence of a writing defect in the storage unit during the write registration process, and it is possible to suppress the replacement of the storage unit and the rewriting operation, thereby reducing the cost. And work man-hours can be reduced.

According to the second aspect of the present invention, the input state determination unit measures the modulation degree of the response signal input to the immobilizer, and when the modulation degree is larger than a preset reference modulation degree, the write registration process Is determined to be executable.
The degree of modulation corresponds to the strength of the response signal. When the strength of the response signal is sufficient, it is determined that the write registration process can be executed. Therefore, even if the distance between the immobilizer and the portable device, the orientation of the portable device, and the like are unstable, the input state of the response signal in the immobilizer can be properly grasped, and a highly accurate state determination is possible.
Further, the modulation degree can be measured with a simple configuration and can be easily provided in the immobilizer.

According to the third aspect of the present invention, the input state determination unit measures the electric field strength of the response signal input to the immobilizer, and when the electric field strength is larger than a preset reference modulation degree, the write registration process Is determined to be executable.
The electric field strength corresponds to the strength of the response signal. When the strength of the response signal is sufficient, it is determined that the write registration process can be executed. Therefore, even if the distance between the immobilizer and the portable device, the orientation of the portable device, and the like are unstable, the input state of the response signal in the immobilizer can be properly grasped, and a highly accurate state determination is possible.
In addition, the measurement of the electric field strength can be performed with a simple configuration and can be easily provided in the immobilizer.

In the invention according to claim 4, when the input state determining means determines that the state is executable, the notifying means can report this.
Therefore, the registered worker can know the fact that writing is possible by notification and can proceed with the work, and is excellent in workability.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The anti-theft device according to this embodiment generates a power by receiving a transponder driving radio wave (KS), and has a response output unit (24) that outputs a response signal indicating a unique immobilizer ID code (2) And an immobilizer (8) that receives the response signal (OTS) transmitted from the portable device (2) and obtains the immobilization ID code indicated by the response signal (OTS) while outputting the transponder driving radio wave (KS). ) And the immobilizer ID code acquired by the immobilizer (8) are compared with a registered ID code registered in the storage unit (13) in advance, and the antitheft control is canceled when the verification is established. Unit (11) and a write registration process for writing the registration ID code in the storage unit (13), and the response signal ( The anti-theft device comprising a registration control unit (11) that writes the immobility ID code acquired from TS) as the registration ID code in the storage unit (13), when the write registration process is executed The input state of the response signal (OTS) includes input state determination means (11) for determining whether or not the write registration process can be performed, and the registration control unit (11) The input state determination means (11) outputs the transponder driving radio wave (KS) when determining that the state is executable, and the immobility ID code acquired from the obtained response signal (OTS) is stored in the storage unit (13). An anti-theft device that is written as a registered ID code.

  Below, based on FIGS. 1-3, the antitheft device of Example 1 of the best mode for carrying out the present invention will be described.

  The antitheft device according to the first embodiment includes two types of verification systems, a so-called intelligent key system and an immobilizer system.

  The intelligent key system is based on the result of collation of the electronic ID code by bidirectional communication between the key controller 1 and the portable device 2 shown in FIG. Switching between locking and unlocking of the locking device and starting and stopping of a driving source such as an engine and a motor are performed.

  The immobilizer system obtains a unique immobilizer ID code of the portable device, which is different from the electronic ID code of the intelligent key system, by the immobilizer 8, and compares this immobilizer ID code with a pre-stored registered ID code. In this case, the system permits the start of a driving source (not shown) and the unlocking of the steering lock device when verification is made.

  As a component of the above-described intelligent key system and immobilizer system, the first embodiment includes a key controller 1 and a portable device 2 provided on the vehicle side.

  The key controller 1 is connected to a lock controller 3, a drive system controller 4, a red diode (notification means) 5r, a green diode (notification means) 5g, and a push switch 5.

The lock controller (anti-theft control unit) 3 is a controller that controls switching of locking and unlocking of a door lock device and a steering lock device (not shown).
The drive system controller (theft prevention control unit) 4 is a controller that switches start and stop of a drive source (not shown).

  The red diode 5r and the green diode 5g are provided inside the push switch 5 for instructing start of the engine (not shown), and the upper surface of the push switch 5 is lit in red and green, respectively. The push switch 5 is a switch for starting a driving source (not shown), and is installed in an instrument panel or console box (not shown). Normally, the key controller 1 turns on the green diode 5g when the engine can be started, and turns on the red diode 5r when the engine cannot be started.

The key controller 1 includes an antenna driver 71 and an entry tuner 72 as components of the intelligent system described above.
The antenna driver 71 outputs a request signal LFS from antennas 73 installed at a plurality of locations of the vehicle.
The entry tuner 72 receives the ID signal RFS used for the intelligent key system transmitted from the portable device 2 and acquires a unique electronic ID code. The interface tuner 72a performs digital / analog conversion of the signal, and the ID A demodulation circuit 72b for converting the signal RFS into an electronic code is provided.

  The key controller 1 is written with a control unit 11 composed of a microcomputer that performs various controls, an interface circuit 12 that converts signals between the entry tuner 72 and the control unit 11, and a registration ID code described later. Storage unit 13.

The control part 11 performs the process mentioned later as an antitheft control part, an input state determination means, and a registration control part.
The storage unit 13 is a memory that can be written only once. In addition, the registration ID code was written as a registration ID code when the unique immobility ID code of the portable device 2 assigned to the vehicle was first input by a write registration process described later. Is.

The immobilizer 8 includes a base station 81, an interface circuit 82, an antenna 83, and a modulation degree measurement circuit (input state determination means) 84. The antenna 83 is disposed in the vicinity of the push switch 5, and an instrument panel (not shown) is provided. Or it is provided in the console box.
The base station 81 includes an antenna driver 85 that outputs a transponder driving radio wave KS from an antenna 83, and a demodulation circuit 86 that acquires an immobilizer ID code from a response signal OTS sent from the portable device 2 received by the antenna 83. .

  The modulation degree measurement circuit 84 measures the modulation degree of the response signal OTS output from the portable device 2. This degree of modulation is proportional to the magnitude of the energy of the response signal OTS.

  As described above, the portable device 2 outputs the ID signal RFS when the request signal LFS is received and when the request switch 21 is turned on, and outputs the response signal OTS when the transponder driving radio wave KS is input. A circuit 22, a control unit 23, and a demodulation / response output circuit (response output unit) 24 are provided. Moreover, although illustration is abbreviate | omitted, the emergency key (illustration omitted) which can switch the locking and unlocking | release of the door lock apparatus outside a figure in the portable device 2 is accommodated. Therefore, when the battery of the portable device 2 has run out, the emergency lock can be used to unlock the door lock device.

  The demodulator / response output circuit 24 receives the request signal LFS, obtains an electronic ID code from the request signal LFS, and generates power by electromagnetic coupling when the transponder drive radio wave KS is input from the immobilizer 8. It has a response function that outputs a response signal OTS by this power. The demodulation / response output circuit 24 is provided with antennas 24a, 24b, and 24c for inputting the request signal LFS and the transponder drive radio wave KS and outputting the response signal OTS.

  The control unit 23 receives an ID signal RFS indicating a preset electronic ID code from the transmission circuit 22 when a request signal LFS having a preset electronic ID code is input, and when the request switch 21 is turned on. Execute the control to output.

  Below, the flow of the write registration process, which is a process of writing the registration ID code in the storage unit 13, will be described with reference to the flowcharts of FIGS.

  First, in step S1, the control unit 11 waits for an ignition switch (not shown) to turn on. In next step S2, it is determined whether the ignition switch (not shown) has been switched from OFF to ON. When switching to, proceed to the next step S3, and when not switching, return to step S1.

In step S3, it is determined whether or not the registration mode flag is 1. If “1”, the process proceeds to step S4, and if “0”, the process proceeds to step S16.
In this step S3, it is determined whether the write registration process is executed or the normal control is executed. The registration mode flag is set to “1” in the initial setting state, and the write registration process is executed. When finished, it is changed to “0”.
Therefore, at the time of executing the write registration process, the registration mode flag is still “1”, the process proceeds to step S4, and the process proceeds to the write registration process. On the other hand, after the write registration process is completed, the registration mode flag is changed to “0”, so that the routine proceeds to the normal control in step S16.

In step S4, the process proceeds to the write registration process, and the red diode 5r is turned on to notify this.
In the first embodiment, as the write registration process, first, the modulation degree of the response signal OTS output from the portable device 2 is measured.
Therefore, first, the transponder driving radio wave KS is output from the immobilizer 8 in step S5.

  In subsequent step S6, in response to the output of the transponder driving radio wave KS, it is determined whether or not a response signal OTS has been returned from the portable device 2. If the response signal OTS has been input, the process proceeds to step S7. If there is no OTS input, the process returns to step S5.

In step S7, the modulation factor is measured by the modulation factor measurement circuit 84 from the received waveform of the response signal OTS. This degree of modulation corresponds to the intensity of the response signal OTS.
Therefore, in the next step S8, whether or not the degree of modulation obtained in step S7 is sufficiently strong (that is, the input state) to execute the writing of the registration ID code is larger than a preset threshold value, for example. If it is larger than the threshold value, the process proceeds to the next step S9, and if it is smaller than the threshold value, the process returns to step S5. The modulation degree measurement circuit 84 and the part that executes the processing of step S8 correspond to the input state determination means in the claims. Further, the part that executes the processing after step S9 corresponds to the registration control unit.

  In step S9, the response signal OTS notifies that the writing registration can be executed (that is, the input state). In the first embodiment, this notification is indicated by lighting of the green diode 5g, and at this time, the push switch 5 switches from red lighting to green lighting.

  In the next step S10, a signal for starting execution of the write registration process, that is, a process for waiting for the input of the start trigger signal is executed, and in the next step S11, it is determined whether or not the start trigger signal is input. In the first embodiment, the start trigger signal is ON (long press) longer than a predetermined time of the push switch 5 (several seconds in the first embodiment, for example, 3 to 5 seconds).

In step S11, when a start trigger signal is input, the process proceeds to step S12, and a process of writing the immobility ID code acquired from the response signal OTS of the portable device 2 in the storage unit 13 is performed.
That is, when the push switch 5 is turned on, the control unit 11 outputs the transponder driving radio wave KS from the immobilizer 8 and stores the immobilizer ID code acquired from the returned response signal OTS in the storage unit 13. Register as a registration ID code.

  In the next step S13, it is determined whether or not registration of the registration ID code has been normally performed. If it is determined that registration has been performed normally, the process proceeds to step S14 to complete the write registration process, and the green diode 5g is turned on. Turn off the light. On the other hand, if there is an abnormality in writing the registration ID code, the process proceeds to step S15 to end the write registration process and turn on the red diode 5r to report the abnormality.

Next, the operation of the first embodiment will be described.
A procedure for writing and registering the unique immobility ID code of the portable device 2 as a registration ID code in the storage unit 13 when the vehicle is turned off will be described.
First, the registered worker holds the portable device 2 assigned to the line-off vehicle, gets into the vehicle, and turns on an ignition switch (not shown).
When this line is off, the registration ID code is not written in the storage unit 13 and the registration mode flag = 1, and therefore the flow of processing from the step S1 → S2 → S3 → S4 of the control unit 11 is followed. Based on this, the process proceeds to the write registration process, and the push switch 5 is lit in red.

  Here, the registration worker holds the portable device 2 over the push switch 5. That is, the immobilizer 8 is installed in the vicinity of the push switch 5 of the instrument panel or the console box, and the registration operator can bring the portable device 2 close to the push switch 5 to approach the immobilizer 8.

At this time, when the transponder driving radio wave KS is output from the immobilizer 8 and the response signal OTS is input based on the processing of the control unit 11 in steps S5 → S6 → S7 → S8 → S9, the modulation degree of the response signal OTS Is measured.
Here, when the portable device 2 is close to the push switch 5 (immobilizer 8) and the response signal OTS has sufficient strength (= good input state), the lighting color of the push switch 5 starts from red. Switch to green. When the push switch 5 remains lit red, the response signal OTS has insufficient strength (= input failure state), so that the registration operator further moves the portable device 2 to the push switch 5 (immobilizer 8). )

Thereafter, the registration worker confirms that the lighting color of the push switch 5 has changed to green, and presses and holds the push switch 5 without changing the position of the portable device 2.
In response to the long press of the push switch 5, the output of the transponder driving radio wave KS is first made based on the processing of steps S10 → S11 → S12. In response to the input of the transponder driving radio wave KS, the portable device 2 outputs a response signal OTS, and the immobilizer 8 acquires an immobilizer ID code from the response signal OTS and sends it to the control unit 11. Then, the control unit 11 writes this immobility ID code in the storage unit 13 as a registration ID code unique to the vehicle.

  When the registration ID code is normally written in the storage unit 13 by the above processing, the push switch 5 is turned off based on the processing from step S13 → S14, and the registration worker has successfully registered. Know. On the other hand, if the registration is not normally performed, the push switch 5 is lit in red, and the operator knows that an abnormality has occurred in the registration and can perform processing corresponding to this.

  In the antitheft device according to the first embodiment in which ID registration is performed as described above, when the battery of the portable device 2 is normal, an intelligent key system is used to lock the door lock device and the steering lock device (not shown). Switching to unlocking and switching of starting and stopping of a driving source (not shown) can be performed based on authentication by intelligent ID, and the crime prevention property is excellent.

  Even when the battery of the portable device 2 is exhausted, the immobilizer system holds the portable device 2 close to the push switch 5 and presses the push switch 5 to check the immobilizer ID code of the portable device 2. The Therefore, based on the verification of the immobilizer ID code, an anti-theft state in which the start of the drive source (not shown) is prohibited or the steering lock device is locked, and the start of the drive source is permitted and the steering lock device is unlocked. The anti-theft control release state can be switched, and the anti-theft property can be ensured.

As described above, in the first embodiment, the effects listed below can be obtained.
a) Based on the modulation degree (= input state) of the response signal OTS input from the portable device 2 to the immobilizer 8 when performing registration for writing and registering the immobilization ID code of the portable device 2 as the registration ID code in the storage unit 13. Then, it is determined whether or not the response signal OTS can be normally input, and writing registration can be executed only in a state where the normal input is possible.
Therefore, it is possible to prevent the writing registration process from being abnormally terminated due to a failure in the input state of the response signal OTS due to the mobile device 2 being away from the immobilizer 8 or having an inappropriate orientation.
b) Since the input state of the response signal OTS from the portable device 2 is determined based on the degree of modulation of the response signal OTS, it can be determined with a simple configuration in the immobilizer 8, and the cost, weight, manufacturing This is advantageous in terms of labor.
c) The determination result of whether the input state of the response signal is good or not can be visually reported to the registered worker by the emission color of the push switch 5. Therefore, the registration worker can visually know whether the input state of the response signal is good or not, and the workability is excellent.
d) Since the antenna 83 of the immobilizer 8 is disposed in the vicinity of the push switch 5 that emits light in order to report whether or not the write registration process is executable, the mobile device 2 is brought close to the immobilizer 8; The line of sight can be matched with the action of confirming whether or not the write registration process can be executed, and the workability is excellent.
Furthermore, since the trigger for starting the writing registration is a long press of the push switch 5, the line of sight of the work instructing the start of the writing registration can be made to coincide with the line of sight, and the work registration is excellent and the writing registration is performed. It is possible to prevent the position of the portable device 2 from fluctuating during the start instruction work, and the workability is further improved.

  Next, an antitheft device according to Example 2 of the embodiment of the present invention will be described with reference to FIGS. Since the second embodiment is a modification of the first embodiment, only the difference will be described, and the description of the same configuration and operational effects as the first embodiment will be omitted.

  In the second embodiment, as shown in FIG. 4, the immobilizer 208 is provided with an electric field strength measuring circuit 284 that measures the electric field strength of the response signal OTS.

  FIG. 5 shows a part of the write registration processing flow of the antitheft device of the second embodiment. The difference from the write registration processing in the first embodiment is that steps S207 and S208 following step S6 are performed. The processing contents of are different.

  In step S207, the electric field intensity measurement circuit 284 determines the electric field intensity of the response signal OTS. In the next step S208, it is determined whether or not the electric field strength is equal to or higher than a preset threshold value. If the electric field strength is equal to or higher than the threshold value, the process proceeds to the next step S9, and returns to step S5 if it is less than the threshold value.

  Here, the threshold value is set to an electric field strength that can reliably read the immobilizer ID code from the input response signal OTS.

  Accordingly, even in the second embodiment, similar to the first embodiment, the portable device 2 is separated from the immobilizer 208 or the orientation is inappropriate, and writing due to a defective input state of the response signal is caused. Abnormal termination of the registration process can be prevented.

Further, since the determination of the input state of the response signal OTS from the portable device 2 is performed based on the electric field strength of the response signal OTS, it can be determined with a simple configuration in the immobilizer 8, and the cost, weight, manufacturing This is advantageous in terms of labor.
In addition, as in Example 1, the effects c) and d) are achieved.

  As described above, the embodiment of the present invention and Examples 1 and 2 have been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment and Examples 1 and 2, and the present invention is not limited thereto. Design changes that do not depart from the gist are included in the present invention.

  For example, in the first embodiment, as the input state determination means, the means for calculating the modulation degree of the response signal and the means for measuring the electric field strength are shown, but the response signal is in a state sufficient to execute the write registration process. Other means can be used as long as it can be determined whether or not there is. For example, the input state of the response signal from the portable device is inversely proportional to the distance between the portable device and the immobilizer. Therefore, a means for measuring this distance may be used. As a means for measuring such a distance, the means for measuring the degree of modulation and the electric field strength shown in the first and second embodiments are also regarded as distance measuring means because their levels are substantially proportional to the distance. It is possible, however, purely distance measuring means may be used. As a means for measuring such a distance, for example, there is a means for three-dimensionally measuring the distance between a portable device such as an in-vehicle camera and the installation position of the immobilizer. Alternatively, a means for detecting the position of the immobilizer and the position of the portable device by using a means for detecting radio waves and calculating the distance can be used.

In the first and second embodiments, the immobilizers 8 and 208 have been described as being disposed in the vicinity of the push switch 5, but the installation position is not limited to this. For example, a case for accommodating the portable device 2 may be provided on an instrument panel or a console, and an immobilizer may be installed in the case. In this case, if the writing registration work is performed with the portable device in the housing state, the position of the portable device is stabilized and the above-described writing failure is less likely to occur, but by checking the input state of the response signal OTS, More reliable writing registration can be performed.
Furthermore, although the push switch 5 which commands the start of the drive source is used as the write registration trigger, the present invention is not limited to this, and other in-vehicle switches can be used.

  Moreover, although each diode 5r, 5g was shown as an alerting | reporting means, it is not limited to this, Other means, such as a buzzer and an audio | voice guide, can also be used.

It is a block diagram which shows the antitheft device of Example 1 of the best mode of the present invention. 6 is a flowchart illustrating a first half of a flow of a write registration process in which a registration ID code is written in a storage unit 13 by the antitheft device according to the first embodiment. 4 is a flowchart illustrating a second half of a flow of a write registration process in which a registration ID code is written in a storage unit 13 by the antitheft device according to the first embodiment. It is a block diagram which shows the anti-theft device of Example 2. 10 is a flowchart illustrating a first half of a flow of a write registration process in which a registration ID code is written in a storage unit 13 by an antitheft device according to a second embodiment.

Explanation of symbols

1 Key controller 2 Mobile device 3 Lock controller (theft prevention part)
4 Drive system controller (theft prevention part)
5 Push switch 5g Green diode (notification means)
5r Red diode (notification means)
8 Immobilizer 11 Control unit (Anti-theft control unit, registration control unit)
13 Storage Unit 24 Demodulation / Response Output Circuit (Response Output Unit)
84 Modulation degree measurement circuit 208 Immobilizer 284 Electric field strength measurement circuit KS Transponder drive radio wave OTS Response signal

Claims (4)

A portable device having a response output unit that generates power by receiving a transponder driving radio wave and outputs a response signal indicating a unique immobilizer ID code;
An immobilizer that outputs a transponder drive radio wave, receives a response signal transmitted from the portable device, and acquires an immobilizer ID code indicated by the response signal;
The anti-theft control unit that compares the immobilizer ID code acquired by the immobilizer with a registered ID code registered in the storage unit in advance, and cancels the anti-theft state when the verification is established;
A write registration process for writing the registration ID code in the storage unit is executed, and the immobility ID code acquired from the response signal received when the write registration process is executed is written as the registration ID code in the storage unit. A registration control unit;
An anti-theft device with
An input state determination unit that determines whether or not the input state of the response signal is a state in which the write registration process can be performed when the write registration process is performed;
The registration control unit causes the transponder drive radio wave to be output when the input state determination unit determines that it is in an executable state, and writes an immobility ID code acquired from the obtained response signal as a registration ID code in the storage unit An anti-theft device characterized by that.   2. The input state determination unit measures the modulation degree of the ID signal, and determines that it is in an executable state when the modulation degree is larger than a preset reference modulation degree. The anti-theft device described in 1.   The input state determination means determines that the state is executable based on the electric field intensity of the ID signal when the electric field intensity is larger than a preset reference electric field intensity. The anti-theft device described in 1.   The said registration control part alert | reports the said executable state by alerting | reporting means, when the said input state determination means determines with the said executable state, The any one of Claims 1-3 characterized by the above-mentioned. The anti-theft device described.

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