JP4407026B2 - Vehicle anti-theft device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle antitheft device.
[0002]
[Prior art]
Various types of anti-theft devices for vehicles have been proposed. An anti-theft control unit called an immobilizer (first control unit) is used to control the operating state of an engine such as an EGI. Those that control the operating state of the control unit (second control unit) are rapidly spreading.
[0003]
As a vehicle antitheft device using this immobilizer, there is JP-A-10-53106. In this publication, a code reading means for reading a first code corresponding to a key inserted into an IG (ignition) switch, a first control unit (immobilizer) for receiving an output from the code reading means, and an operating state of the engine And a second control unit such as EGI for controlling the control. When the IG switch is turned on, a request signal is output from the second control unit to the first control unit, and the first control unit that has received this request signal starts reading the first code. The first code is collated with the second code stored in the first control unit self-confidence, and if the collation results match, the permission signal is output to the second control unit so that the engine can be operated, When the verification results do not match, a non-permission signal is output to the second control unit to stop (prohibit) engine operation.
[0004]
[Problems to be solved by the invention]
However, in the above-mentioned publication, since the first control unit starts to operate after receiving the request signal from the second control unit, the permission signal or the non-permission signal is finally transmitted from the first control unit to the second control unit. It will take a considerable amount of time to output to the unit. This means that it takes a long time to start the engine when the vehicle is to be driven using a normal key.
[0005]
In addition, in order to shorten the time until the engine start when the normal key is used, the first control unit is started before the second control unit, and the first code and the second code are collated in advance. It is possible to do it. However, in this case, when the permission signal / non-permission signal based on the collation result is output from the first control unit to the second control unit, the second control unit may not be activated, thereby reliably preventing theft. There is room for improvement from the perspective of obtaining functionality.
[0006]
The present invention has been made in consideration of the above-described circumstances, and the object of the present invention is from the first control unit based on the collation result between the first code corresponding to the key and the stored second code. In the one that outputs a permission signal or a non-permission signal that becomes an engine operation permission signal to the two control units, the time until the permission signal / non-permission signal is output to the second control unit can be shortened, and An object of the present invention is to provide a vehicle antitheft device that can recognize a driving permission signal.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides the following solution as a solution. That is, as described in claim 1 in the claims,
Code reading means for reading the first code corresponding to the key;
A first control unit that receives an output from the code reading means;
A second control unit for controlling the operating state of the engine;
With
The first control unit includes:
Code storage means for storing the second code;
Collating means for collating before the activation of the second control unit whether the first code read by the code reading means and the second code stored in the code storage means match or do not match When,
Verification result storage means for storing a verification result by the verification means;
Activation detection means for detecting that the second control unit is activated;
When it is confirmed by the activation detection means that the second control unit is activated, a permission signal for permitting engine operation is provided when the collation results stored in the collation result storage means match. Driving enable / disable signal output means for transmitting to the second control unit a non-permission signal for transmitting to the second control unit and stopping the operation of the engine when the verification result does not match;
have,
It is like that. A preferred mode based on the above solution is as described in claim 2 and the following claims.
[0008]
【The invention's effect】
According to the invention described in claim 1, the first control unit collates the first code and the second code in advance before starting the second control unit, and stores the collation result, After confirming that the second control unit is activated, an operation permission signal / non-permission signal is output to the second control unit based on the stored collation result. The time until the output can be shortened, which is preferable for shortening the time until the engine is started particularly when the correct key is used. In addition, a permission signal / non-permission signal (particularly a non-permission signal when using an unauthorized key from the viewpoint of theft prevention) is surely input to the second control unit, and the first code and the second code do not match. The anti-theft function at the time can be surely exhibited.
[0009]
According to the second aspect of the present invention, the second control unit is illegally maintained in the activated state by the theft, and the request signal for the permission signal / non-permission signal is generated even when the engine is started. Even if the unit does not output to the first control unit, a request signal is output from the second control unit to the first control unit when the engine speed reaches a predetermined speed, and a new permission signal / non-permission is issued. Since the second control unit receives the signal, the operation should be continued when a normal key is used, and when an illegal key is used, the engine operation is stopped to ensure theft prevention. Can do.
[0010]
According to the third aspect of the present invention, when the request signal is output from the second control unit to the first control unit when the engine speed reaches the predetermined speed, the first control unit is forced to Since it is in the activated state, it is preferable to obtain the effect corresponding to claim 2 more reliably.
[0011]
According to the invention described in claim 4, it is possible to prevent theft by quickly setting the second control unit to the operation non-permitted state when starting the engine when the second control unit is illegally activated. .
[0012]
According to the fifth aspect of the present invention, even if the second control unit is illegally activated and the engine is started once, when the engine speed reaches the predetermined speed, the first control unit is newly set. Since the code and the second code are collated, and the permission signal / non-permission signal is output to the second control unit based on the new collation result, theft prevention can be more reliably performed.
[0013]
According to the sixth aspect of the present invention, it is possible to prevent a situation in which it is determined that the verification key does not match when the normal key is inserted halfway into the key switch, that is, the engine is used when the normal key is used. This is preferable in preventing a situation where starting is prohibited. In addition, when key rotation is detected, the key insertion position can be determined as the operable position. In this case, when the first code cannot be read, the collation does not match, so that theft Prevention can be achieved.
[0014]
According to the seventh aspect of the present invention, it is preferable to suppress power consumption due to repeated reading while increasing the possibility of normally reading the first code.
[0015]
According to the invention described in claim 8, even if an instantaneous interruption occurs due to vibration, noise, or the like, the collation result can be surely stored and saved.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
In FIG. 1, U1 is a first control unit, U2 is a second control unit, and IGS is an IG (ignition) switch. The IG switch IGS includes a key switch 1 that is opened and closed using a key (not shown), a main power switch (sometimes referred to simply as an IG switch) 2, and a starter switch 3. 3 are each connected to a battery 4.
[0017]
The key switch 1 is turned on (closed) when the key is inserted into the IG switch IGS to a predetermined depth, and is used for confirming the presence of the key. The key can be inserted into and removed from the IG switch IGS only at this position. It has become. The key switch 1 continues to be turned on even if the key is rotated to the position of the main power switch 2 or the starter switch 3. The main power switch 2 is turned on when the key is rotated in a predetermined direction from the position of the key switch 1. The main power switch 2 is turned on (closed). This is for power supply to auxiliary equipment not related to the running of the vehicle.
[0018]
The starter switch 3 is turned on when the key is further rotated in a predetermined direction from the position of the main power switch 2 (the main power switch 2 remains on even when the key is at the position of the starter switch 3). ), For supplying power to the starter motor 5 for starting the engine, and is automatically returned to the position of the main power switch 2 by releasing the hand from the key. The power supply to the starter motor 5 is performed from the starter switch 3 via the starter cut relay 6. Note that the IG switch IGS may further include an accessory switch at the rotational position between the key switch 1 and the main power switch 2 (the accessory switch has an accessory such as audio that is not related to vehicle travel). Power is supplied only to equipment).
[0019]
The first control unit U1 is connected to the battery 4 via the key switch 1 and the main power switch 2. Thereby, the first control unit U1 starts its control by inserting the key into the IG switch IGS, and the key position is confirmed. The first control unit U1 controls the opening / closing (on / off) of the starter cut relay 6. The starter cut relay 6 is set to be off (open) in its initial state (normally off). The power supply to the starter motor 5 is impossible).
[0020]
The second control unit U2 is connected to the battery 4 via the main power switch 2. Thereby, the second control unit U2 starts the control by setting the key to the position of the main power switch 2, and the key position is confirmed. As described above, since the second control unit U2 receives power supply at the position of the main power switch 2, the control starts at a later timing than the first control unit that receives power supply at the position of the key switch 1. It has come to be. And the 2nd control unit U2 is set to the operation permission state which can perform control required for engine operation, such as engine starting control, at the time of the starting.
[0021]
The key is given a first code as an ID code for distinguishing it from other keys. For this reason, a transponder 7 for transmitting information indicating the first code is attached to the key. An antenna (coil antenna) 8 for reading the first code indicated by the transponder 7 is provided in the IG switch IGS. That is, when the key is inserted into the IG switch IGS to a predetermined depth, information indicating the first code generated by the transponder 7 can be read by the antenna 8, and the read first code is input to the first control unit U1. The
[0022]
The first control unit U1 includes a CPU 11 that controls the entire control, an EEPROM 12 as a code storage unit that stores the second code, and a verification result storage unit that stores a verification result of the first code and the second code. B / URAM 13 and RAM 14 for temporary storage of data. Of course, the stored second code is set to coincide with the first code attached to the normal key when the vehicle is shipped. As will be described in detail later, the CPU 11 basically has a function of verifying whether the first code read by the antenna 8 matches or does not match the second code stored in the EEPROM 12 (matching means). The function for storing and updating the collation result in the B / URAM 13 and the engine operation enable / disable signal (permission signal for permitting operation and non-permit signal for prohibiting operation) are output to the second control unit based on the collation result. Function (operation availability signal output means).
[0023]
The second control unit U2 has a B / URAM 22 for storing operation permission / prohibition signals such as a permission signal and a disapproval signal received from the first control unit U1 in addition to the CPU 21 that controls the entire control, and temporary storage of data. It has RAM23 which performs. The second control unit U2 basically controls the operation of the engine, and performs, for example, fuel injection amount control and ignition timing control.
[0024]
In addition, the second control unit U2, as will be described in detail later, operates the engine as it is when it receives a permission signal from the first control unit U1, but operates the engine when it receives a non-permission signal. The control for stopping (prohibiting) is also performed. Note that the engine operation is stopped by the second control unit U2, for example, by performing fuel cut or ignition cut. The second control unit U2 performs the first control when necessary, for example, when the engine is started and when the engine speed reaches a predetermined speed (in the embodiment, for example, 500 rpm indicating the complete explosion speed of the engine). A request signal is output to the unit U1. Upon receiving this request signal, the first control unit U1 outputs an operation permission / prohibition signal such as a permission signal and a disapproval signal to the second control unit U2. Note that a signal from the engine speed sensor 24 and a signal from the vehicle speed sensor 25 are input to the second control unit U2 for later-described control.
[0025]
Here, the B / URAM 13 of the first control unit U1 and the B / URAM 22 of the second control unit U2 respectively store their contents when there is an instantaneous interruption (a state where power supply is temporarily interrupted due to vibration, noise, etc.). Is set to be retained. For this reason, it is conceivable that each of the RAMs 12 and 22 is composed of a non-volatile memory. However, from the viewpoint of cost and the like, as shown in FIG. It is set to receive power.
[0026]
Next, details of the control of the first control unit U1 and the second control unit U2 will be described with reference to the flowchart in FIG. Further, in the flowcharts of FIG. 3 and subsequent figures, the first control unit U1 is expressed as an immobilizer (immobilizer), and the second control unit U2 is expressed as EGI. First, the control contents of the first control unit U1 will be described with reference to FIGS. 3 to 5. In S201 of FIG. 3, it is determined whether or not a key is inserted in the IG switch IGS. If the determination in S201 is NO, it is determined in S202 whether there is a request signal from the EGI (second control unit U2). If the determination in S202 is NO, the stored contents of the B / URAM 13 are cleared in S203, and then the first control unit U1 is put into a sleep state in S204.
[0027]
If YES in S201, or YES in S202, the first control unit U1 is woken up (activated) in S205, and then the data stored in the B / URAM 13 is stored in S206. It is determined whether or not it exists. If the determination in S206 is NO, after reading the first code in S209, the process proceeds to S210 in FIG.
[0028]
In S210, it is determined whether or not the first code has been read. If the determination in S210 is YES, in S218, the read first code is collated with the second code stored in the EEPROM 12. Next, in S219, after the collation result, that is, whether the first code and the second code match or not match is stored in the B / URAM 13, it is determined in S220 whether or not the collation result is coincident. Is done. If YES in S220, the starter relay 6 is turned on in S21 so that the starter motor 5 can be operated. If NO in S220, the starter relay 6 is turned off to make the starter motor 5 inoperable, assuming that an unauthorized key is being used.
[0029]
After S221 or S222, it is determined in S223 in FIG. 5 whether or not a predetermined time has elapsed since the previous reading of the first code. Initially, the determination at S23 is NO, and at this time, at S224, it is determined whether a request signal is received from the second control unit U2. If the determination in S224 is NO, the process returns to S223. Note that the determination of the presence / absence of a request signal from the second control unit U2 in S224 is a determination of whether or not the second control unit U2 is activated.
[0030]
If the determination in S223 is YES, after the first code is read again in S225, the first code and the second code are verified in S226. Thereafter, in S227, the collation result in S226 is stored (updated) in the B / URAM 13, and then the process returns to S224.
[0031]
When the determination in S224 is YES, in S230, the contents (information of matching result matching or mismatching) stored in the B / URAM 13 are output (transmitted) to the second control unit U2. Thereafter, in S231, it is determined whether or not the content stored in the B / URAM 13, that is, the collation result output to the second control unit U2, is inconsistent. If the determination in S231 is YES, the starter cut relay 6 is turned off in S228, and then the process proceeds to S225 described above.
[0032]
If NO in S231, the starter cut relay 6 is turned on in S229. Thereafter, in S232, it is determined whether or not the key is disconnected from the IG switch IGS and there is no request signal from the second control unit U2. If the determination in S232 is NO, the process returns to S224 described above. When the determination in S232 is YES, in S233, after the stored contents of the B / URAM 13 are cleared, the first control unit U1 is set to sleep.
[0033]
If the determination in S206 of FIG. 3 is YES, it is determined in S207 whether the contents stored in the B / URAM 13 match. If the determination in S207 is YES, the starter cut relay 6 is turned on in S208, and the process proceeds to S224 in FIG. If NO in S207, the process proceeds to S209.
[0034]
If the determination in S210 of FIG. 4 is NO, it is determined in S211 whether or not the key position is the position of the main power switch 2. If the determination in S21 is YES, the process proceeds to S218 after the first code is read in S212. If the determination in S211 is NO, it is determined in S213 whether the first code has been read a predetermined number of times. When the determination in S213 is NO, the process proceeds to S209 in FIG. 3 and the first code is read.
[0035]
If the determination in S213 is YES, the first code cannot be read even if the first code is read a predetermined number of times. At this time, in S214, it is determined whether or not the key position is the position of the main power switch 2. If the determination in S214 is YES, the process proceeds to S209 in FIG. 3 and the first code is read. When the determination in S214 is NO, it is determined whether or not the key is disconnected from the IG switch IGS (IG off) and there is no request signal from the second control unit U2. If the determination in S215 is NO, the process returns to S214. If the determination in S215 is YES, after clearing the stored contents of the B / URAM 13 in S216, the first control unit U1 is set to sleep in S217.
[0036]
Next, the control on the second control unit U2 (EGI) side will be described with reference to the flowcharts of FIGS. First, in S301 in FIG. 6, it is determined whether or not the main power switch 2 has been turned on for the first time after inserting the key into the IG switch IGS. That is, after the starter switch 3 is turned on once, the main power switch is turned on. It is determined whether or not it is when the position 2 is reached.
[0037]
If YES in step S303, it is determined in step S303 whether the vehicle is traveling at a predetermined vehicle speed or higher and an instantaneous interruption has occurred. If the determination in S303 is NO, the engine operation is permitted in S306, and a request signal is output to the control unit U1 in S307. Thereafter, in S308, after waiting for a predetermined time from the output of the request signal, in S309, it is determined whether or not there is a response from the first control unit U1, that is, an operation enable / disable signal corresponding to the request signal (permission signal or not). It is determined whether or not there is a permission signal.
[0038]
If YES in step S309, it is determined in step S310 whether the response signal is a permission signal. If the determination in S310 is YES, in S311, the storage content of the B / URAM 22 of the second control unit U2 is stored and updated in accordance with the response signal, and then the engine operation permission is continued in S312. (Continue to run the engine)
[0039]
When the determination in S301 is NO, it is determined whether or not the engine speed has reached 500 rpm corresponding to the complete explosion speed. If the determination in S302 is NO, the process returns to S301. If the determination in S302 is YES, the process proceeds to S303 described above.
[0040]
If the determination in S303 is YES, it is determined in S304 whether the content stored in the B / URAM 22 of the second control unit U2 is a permission signal. When the determination in S304 is YES, in S305, permission to operate the engine is continued (continuation of engine operation). If NO in S304, the process proceeds to S306 described above.
[0041]
When the determination in S310 is NO, that is, when the response signal from the first control unit U1 according to the request signal is a non-permission signal, the process proceeds to S320 in FIG. In S320, it is determined whether or not the current vehicle speed is equal to or lower than a predetermined vehicle speed and the content stored in the B / URAM 22 is a permission signal. If the determination in S320 is NO, engine stop control is performed in S317. Next, in S318, the storage content of the B / URAM 22 is stored and updated in a non-permission signal indicating engine stop. Thereafter, in S319, after waiting for a predetermined time T2 from the previous request signal output, the process proceeds to S307 in FIG.
[0042]
If YES in S320, it is determined in S321 whether or not the response signal from the first control unit U1 is a non-permission signal C times (1 <C) continuously. If the determination in S321 is YES, the process proceeds to S317 described above. If NO in S31, the process proceeds to S307 in FIG. 6 after waiting for a predetermined time T1 (T1 <T2) from the previous request signal output in S316.
[0043]
When the determination in S309 of FIG. 6 is NO, that is, when the response signal corresponding to the request signal from the first control unit U1 is not returned from the first control unit U1, the process proceeds to S313 of FIG. In S313, it is determined whether or not the current vehicle speed is equal to or lower than a predetermined vehicle speed and the content stored in the B / URAM 22 is a permission signal. If the determination in S313 is NO, it is determined in S314 whether or not there is no response A times (1 <A) continuously from the first control unit U1. When the determination in S314 is YES, the process proceeds to S317 described above and engine stop control is performed. If the determination in S314 is NO, the process proceeds to S307 in FIG. 6 after the process in S316 described above.
[0044]
If YES in S313, it is determined in S315 whether or not there is no B response (A <B) continuously from the first control unit U1. When the determination in S315 is YES, the process proceeds to S317, and engine stop control is performed. If the determination in S315 is NO, the process proceeds to S307 in FIG. 6 after S316.
[0045]
FIG. 8 shows the second embodiment and shows a modification of FIG. That is, when the determination in S202 is YES, that is, when there is a request signal from the second control unit U2, the starter relay 6 is turned off in R101 in FIG. A non-permission signal is output to U2. As described above, when the request signal is received from the second control unit U2, when the first control unit U1 is not in the activated state, the engine is stopped by forcibly outputting the non-permission signal. ing.
[0046]
9 and 10 show a third embodiment. First, FIG. 9 shows a modified example after S224 in FIG. 5. When YES is determined in S224, that is, when a request signal is received from the second control unit U2, in R111, when the IG switch is ON. It is determined whether or not the request signal is. When the determination in R111 is NO, after the first code is read again in R112, the first code and the second code are collated in R113. Thereafter, in R114, the collation result is stored and updated in the B / URAM 13, and then the process proceeds to S230.
[0047]
On the other hand, in the control on the second control unit U2 side, as shown in FIG. 10 showing a modified example of FIG. 6, when the determination in S301 is YES, a flag 1 is set in R121 to indicate that it is at the time of activation. Set to If YES in S302, the flag is reset to 0 to indicate that the engine speed has reached a predetermined speed. After R121 or R12, the process proceeds to S303.
[0048]
After the operation of the engine is permitted in S306, it is determined whether or not the flag is 1 in R123. If the determination in R123 is YES, a request signal for starting is output in R124. Further, when the determination at R123 is NO, a request signal when the engine speed has reached a predetermined speed is output at R125. After R124 and R125, the process proceeds to S308.
[0049]
Here, a supplementary explanation of the above-described flowchart will be given. First, for the first control unit U1, the first code is read, the first code and the second code are collated, and the collation result is stored by inserting the key into the IG switch IGS (S201, S209). , S218, S219), the starter cut relay 6 is controlled to be turned on / off according to the stored collation result (S208, S221, S222, S228, S229).
[0050]
In addition, when a request signal is received from the second control unit U2 and a driving enable / disable signal corresponding to the stored collation result is once output to the second control unit U2 (S230), a predetermined time elapses, When one code is read, the first code and the second code are collated, and the collation result is stored and updated (S223, S225 to S227), the next time the request signal is received, this An operation propriety signal corresponding to the stored and updated collation result is output to the second control unit U2.
[0051]
When there is no response from the first control unit U1 in response to the request signal, or when a non-permission signal is received, the request signal is continuously output until the IG is turned off as shown in FIG. 7 (FIG. 6). (Repetition of the transition from S309 or S310 to S307 in FIG. 6 through S316 or S316 in FIG. 7).
[0052]
In S313 and S320 of FIG. 7, the permission signal is stored in the B / URAM 22 (the previous driving permission signal is the permission signal), and being below the predetermined vehicle speed means that the possibility of theft is low. . In addition, T1 of S316 is set to a value smaller than T2 of S319 because the possibility of theft is lower when going through S316 than when going through S319. This is because when the possibility is low, the output period of the request signal is shortened and the opportunity for traveling is increased as much as possible when compared with the case where the possibility of theft is high.
[0053]
Although the embodiment has been described above, the present invention is not limited to this, and includes, for example, the following cases. As a method for attaching the first code to the key and a method for reading the first code, appropriate methods including known ones can be adopted. Each step (step group) shown in the flow chart or various members such as sensors and switches can be expressed by adding the name of the means to the high-order expression of the function. Further, the function of each step (step group) shown in the flowchart can be expressed as a function of a function unit set in the control unit (controller) (existence of a function unit). Of course, the object of the present invention is not limited to what is explicitly stated, but also implicitly includes providing what is substantially preferred or expressed as an advantage. Furthermore, the present invention can also be expressed as a vehicle theft prevention method.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of the present invention.
FIG. 2 is a circuit diagram showing an example in which stored contents are held at the moment of interruption.
FIG. 3 is a flowchart showing an example of control on the first control unit side.
FIG. 4 is a flowchart showing an example of control on the first control unit side.
FIG. 5 is a flowchart showing an example of control on the first control unit side.
FIG. 6 is a flowchart showing a control example on the second control unit side.
FIG. 7 is a flowchart showing an example of control on the two control unit side.
FIG. 8 shows a second embodiment and is a main part flowchart as a modification of FIG. 3;
FIG. 9 shows a third embodiment and is a main part flowchart as a modification of FIG. 5;
FIG. 10 shows a third embodiment and is a main part flowchart as a modification of FIG. 6;
[Explanation of symbols]
U1: First control unit U2: Second control unit IGS: Ignition switch 1: Key switch 2: Main power switch 3: Starter switch 4: Battery 5: Starter motor 6: Starter cut relay 7: Transponder (first to key Code)
8: Antenna (reading the first code)
12: Second code storage ROM (first control unit)
13: RAM for storing verification results (first control unit)
22: RAM for storing verification results (second control unit)
24: Engine speed sensor 25: Vehicle speed sensor

Claims (8)

Code reading means for reading the first code corresponding to the key;
A first control unit that receives an output from the code reading means;
A second control unit for controlling the operating state of the engine;
With
The first control unit includes:
Code storage means for storing the second code;
Collating means for collating before the activation of the second control unit whether the first code read by the code reading means and the second code stored in the code storage means match or do not match When,
Verification result storage means for storing a verification result by the verification means;
Activation detection means for detecting that the second control unit is activated;
When it is confirmed by the activation detection means that the second control unit is activated, a permission signal for permitting engine operation is provided when the collation results stored in the collation result storage means match. Driving enable / disable signal output means for transmitting to the second control unit a non-permission signal for transmitting to the second control unit and stopping the operation of the engine when the verification result does not match;
have,
A vehicle antitheft device characterized by the above. In claim 1,
The second control unit outputs a request signal to the first control unit at the time of starting the second control unit and when the engine speed reaches a predetermined speed, and the first control unit An antitheft device for a vehicle, wherein the permission signal or the disapproval signal is output to the second control unit in response to a request signal. In claim 2,
When the request signal when the engine speed reaches the predetermined speed is output from the second control unit, if the first control unit is not in the start state, the start is made to start the first control unit An antitheft device for a vehicle, further comprising means. In claim 2 or claim 3,
When the request signal when the engine speed reaches the predetermined speed is output from the second control unit, if the first control unit is not in an activated state, the second control unit is not permitted to operate. An anti-theft device for a vehicle, characterized in that it is in a state. In claim 2,
When the first control unit receives a request signal from the second control unit when the engine speed reaches the predetermined speed, the first control unit newly reads the first code and reads the new code. The first code is newly collated with the second code, and the permission signal or the disapproval signal is output from the driving permission / prohibition signal output means based on the new matching result, to prevent theft of the vehicle apparatus. In claim 1,
The first control unit prohibits collation by the collating means when the first code cannot be read and the rotation of the key is not detected, while the first code cannot be read and the key is rotated. An anti-theft device for a vehicle, characterized in that the result of collation by the collating means is forcibly made to be inconsistent when the is detected. In claim 6,
When the first control unit cannot read the first code and the rotation of the key is not detected, the first control unit reads the first code for a predetermined number of times or for a predetermined time, and still cannot read the first code. An anti-theft device for a vehicle characterized in that reading operation is prohibited at times. In claim 1,
The vehicle anti-theft device, wherein the collation result storage means is set so that the stored content can be retained even in the event of a momentary interruption.

Images