JP3204006B2 - 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 an anti-theft device for a vehicle, which can be locked and unlocked and set / reset to a warning state (a state in which an alarm can be issued) only by wireless communication with the portable apparatus. The present invention relates to an anti-theft device for a vehicle in which a method for releasing a security state when lost is devised.

[0002]

2. Description of the Related Art An anti-theft device for a vehicle, in which a unique code is collated by wireless communication with a portable device and locked and unlocked on condition that they match, is disclosed in, for example,
A device described in JP-A-122379 is known, and the present applicant has already developed and commercialized such an apparatus.

That is, in the device developed by the present applicant, a portable device having a unique code and a unique code wirelessly received from the portable device are collated with those of a vehicle to determine whether the two match. At least as a condition, there is provided an in-vehicle device for setting the vehicle to a locked / alert state or resetting the vehicle to an unlocked / non-alert state, and in the above-mentioned locked / alert state, an unlocking operation using a mechanical key, As soon as the sensor detects any action related to vehicle theft, such as opening operation, opening of the hood, removal of the key cylinder, etc., an alarm is issued by flashing the headlamp, sounding the alarm horn, etc. Thus, theft of the vehicle is prevented.

[0004] Various communication media such as radio waves, infrared rays, and ultrasonic waves are used for wireless communication between the portable device and the vehicle-mounted device.

[0005]

However, in such a vehicle antitheft device according to the above-mentioned development, an alarm is issued on the assumption that the unlocking operation is performed by using a forged mechanical key (engine start key). Because we have set conditions,
When the door is unlocked using a proper engine start key, an alarm operation is performed. Therefore, when the portable device is lost, an alarm is issued upon entry into the vehicle even if the vehicle is owned by the user, and the alarm cannot be stopped until a certain time has elapsed thereafter. There was an inconvenience.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has as its object to reset the locking / alert state only by remote control using a portable device. In the state, when the portable device is lost in the vehicle anti-theft device in which a predetermined alarm operation is performed even when the door is unlocked using the appropriate engine start key, It is another object of the present invention to provide an anti-theft device for a vehicle in which an alarm can be stopped immediately as long as an appropriate engine start key is possessed.

[0007]

According to the first aspect of the present invention, a portable device having a unique code and a unique code wirelessly received from the portable device are collated with those of a vehicle to determine whether the two match. At least as a condition, an on-vehicle device that sets the vehicle in a locked / alert state or resets the vehicle to an unlocked / non-alert state, and in the locked / alert state, the door is opened using an appropriate mechanical key. In an anti-theft device for a vehicle in which a predetermined alarm operation is performed even when unlocked, an engine start key having a built-in electric unique code, and a reading means for reading the unique code from the engine start key Checking means for checking the unique code read by the reading means with that of the vehicle, and stopping the alarm operation on condition that a match is determined by the checking means. By providing a stage in the vehicle side, and is characterized in.

The invention of claim 2 of the present application relates to a portable device having a unique code, and a unique code received by radio from the portable device is compared with that of the vehicle side, and the vehicle is checked at least on condition that they match. An on-vehicle device that is set to a locked / alert state or reset to an unlocked / non-alert state,
In the locking / alert state, in the vehicle anti-theft device that performs a predetermined alarm operation even when the door is unlocked using an appropriate mechanical key, the electric unique code is used. An engine start key incorporated therein, reading means for reading a unique code from the engine start key,
Collating means for collating the unique code read by the reading means with that on the vehicle side; and engine control means for starting operation of the engine on condition that the matching is determined by the collating means and stopping the engine on condition of mismatch determination. And an alarm operation stopping means for stopping the alarm operation on condition that the matching is determined by the matching means.

The invention of claim 3 of the present application relates to a portable device having a unique code, and a unique code received by radio from the portable device is collated with that of a vehicle, and the vehicle is checked at least on condition that they match. An on-vehicle device that is set to a locked / alert state or reset to an unlocked / non-alert state,
In the locking / alert state, in the vehicle anti-theft device that performs a predetermined alarm operation even when the door is unlocked using an appropriate mechanical key, the electric unique code is used. A mechanical key for starting the engine in which the stored chip is embedded, and an engine that receives the mechanical key, transmits a high frequency from a built-in coil, and reads a unique code stored in the chip from the mechanical key by the principle of electromagnetic induction. The key cylinder for starting and the unique code read by the key cylinder are compared with the unique code on the vehicle side, and an immobilizer unit having a communication function and signals from various sensor groups necessary for engine control are obtained. Based on the result of the calculation, various actuators necessary for engine control are executed. Sends an output signal to the group, further comprising an engine control unit which has a communication function, a,
Also, the engine control unit checks the unique code collation result through communication with the immobilizer unit, and starts the engine operation when both match, but stops the engine operation when they do not match. In addition, the in-vehicle device checks the unique code collation result through communication with the immobilizer unit,
A feature is provided in which a function for stopping the alarm operation when both are coincident is provided.

According to a fourth aspect of the present invention, in the vehicle antitheft device according to any one of the first to third aspects, the door of the vehicle body is opened when the vehicle is in the locked / alert state. Any of the actions related to vehicle theft, such as that the various locks on the vehicle body are unlocked, the trunk or hood of the vehicle body is opened, the key cylinder of the vehicle body is removed, etc. In response to this, a predetermined alarm operation is performed.

According to a fifth aspect of the present invention, in the vehicle anti-theft device according to any one of the first to third aspects, the predetermined alarm operation is such that the alarm horn is operated continuously or intermittently. An audible alarm, such as sounding, is provided.

According to a sixth aspect of the present invention, in the vehicle anti-theft device according to any one of the first to third aspects, the predetermined alarm operation is a visual alarm such as blinking of a headlamp. It is characterized by giving an alarm.

[0013]

According to the first aspect of the present invention, when the portable device is lost and the door lock is unlocked with an appropriate engine start key, then the reading means is incorporated in the engine start key. By reading the specified unique code, the alarm operation can be stopped immediately, but if the door lock is unlocked by a forged engine start key that imitates only the shape, The alarm action cannot be stopped.

According to the invention of claim 2 of the present application, when the portable device is lost and the door lock is unlocked with an appropriate engine start key, the reading means then incorporates the door lock into the engine start key. By reading the specified unique code, the alarm operation can be stopped immediately and the engine can be started normally, whereas the forged engine start key imitating only the shape can lock the door lock. When the unlocking is performed, the alarm operation cannot be stopped or even the engine started.

According to the invention of claim 3 of the present application, when the portable device is lost and the door lock is unlocked with an appropriate mechanical key for starting the engine, the mechanical key is thereafter attached to the key cylinder. If the engine is turned on and the engine is started, the alarm will be stopped automatically when the engine is started, but when the door lock is unlocked using a forged engine starting key that imitates only the shape However, even if the key cylinder is destroyed and the ignition switch is directly connected to stop the alarm operation from the beginning, the engine cannot be started unless the matching match of the unique code is determined.

According to the invention of claim 4 of this application, in addition to the operation of the invention of claims 1 to 3, not only the door lock is unlocked by a forged key but also various locks of the vehicle body are unlocked. In response to the detection of any of the following actions related to vehicle theft, such as opening of the trunk or hood of the vehicle body, removal of the key cylinder of the vehicle body, etc. , Only if you have the right key,
Thereafter, the alarm can be stopped.

According to the invention of claim 5 of the present application, in addition to the effects of the invention of claims 1 to 3, when the door lock is unlocked by a forged key, the door lock cannot be unlocked by surrounding third parties. Audible alerts to discourage such theft.

According to the invention of claim 6 of the present application, in addition to the effects of the invention of claims 1 to 3, when the door lock is unlocked by a forged key, the door lock cannot be unlocked by a third party around the door. And visually discourage such theft.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings. First, the appearance of a vehicle to which the vehicle antitheft device according to the present invention is applied is schematically shown in FIG.

In FIG. 1, a portable device 1 is to be carried at all times by a vehicle owner, and is fixed in advance in its rectangular thin housing in response to reception of a transmission request signal from the vehicle. A circuit board on which an electronic circuit for returning the stored unique code to the vehicle is mounted. In this embodiment, wireless communication between the portable device 1 and the vehicle 2 is performed via electromagnetic waves. As a communication medium, it is needless to say that other communication mediums such as ultrasonic waves, infrared rays, and lasers can be used.

On the other hand, on the vehicle 2 side, a transmitting / receiving antenna 3
A lock / unlock / alarm control unit (see FIG. 2) 4 for setting / resetting the lock / unlock / alert state is provided at least on condition of the result of the verification. The locking / unlocking / alarm control unit 4 is housed, for example, inside the hood 5. The details of the wireless communication processing and the like performed between the portable device 1 and the locking / unlocking / alarm control unit 4 will be described later in detail with reference to the flowchart of FIG.

Further, on the vehicle 2 side, a hood opening / closing state switch 6 for detecting the opening / closing state of the hood 5, a door opening / closing state switch 8 for detecting the opening / closing state of the doors 7, 7, and opening / closing of the trunk 9 A trunk opening / closing state switch 10 for detecting a state and a key cylinder tamper switch 11 for detecting that a key cylinder incorporated in the door 7 has been removed are provided, and these switches are involved in vehicle theft. Various actions are detected. In this embodiment, although not shown, the door 7 is further provided with a lock state switch for detecting whether the door lock is locked or unlocked, The locked state switch detects the locked / unlocked state of the door lock. In other words, as described later, when the mechanical key is inserted into the key cylinder of the door and the door is unlocked, the action is detected by the lock state switch. The process of issuing an alarm by an unauthorized opening operation of a door or the like will be described in detail with reference to the flowchart of the alarm control process in FIG. 4 as described later.

In addition, the headlamp 12 of the vehicle 2 is used for a visual alarm operation as described later, and the alarm horn 13 is used for an audible alarm operation. The door operation switch 14 attached to the doors 7, 7 is used for giving an opening / closing command to the doors 7, 7 in wireless locking / unlocking using the portable device 1. The door opening / closing operation will be described later in detail with reference to a remote locking / unlocking control processing flowchart in FIG.

Next, an example of the hardware configuration of the vehicle antitheft device according to the present invention is schematically shown in the block diagram of FIG.

In FIG. 1, a mechanical key 15 is to be carried by a vehicle owner at all times, and is commonly used for starting an engine, opening and closing a door, opening and closing a trunk, etc., as is well known. This mechanical key 15
Has a built-in chip 15a storing a unique code, and the unique code stored in this chip 15a is:
Reading can be performed electromagnetically using high frequency. The details of such a chip are known in various documents and will not be described here.

The key cylinder 16 is for inserting the mechanical key 15 to start the engine.
An electromagnetic coil is built in the key cylinder 16 so as to surround the inserted mechanical key 15, and a unique code can be read from a chip 15 a of the mechanical key 15 via a high frequency flowing through the electromagnetic coil. Done.

The immobilizer unit 17 has a basic function that, when a key switch is directly connected due to the destruction of the key cylinder 16 or the like and the engine is illegally started, the immobilizer unit 17 restrains the start of the engine. This is a process for stopping the process. More specifically, the immobilizer unit 17 is integrally controlled by a CPU mainly composed of a microprocessor, and enables serial communication with the locking / unlocking / alarm control unit 4 described above and an engine control unit 18 described later. Has been established.

The engine control unit 18 performs engine control calculations based on signals from an engine sensor group 19, which collectively refers to various sensors required for engine control, and various actuators required for engine control based on the calculation results. Group of engine actuators
A signal necessary for 0 is output. The basic configuration of the engine control unit 18 is the same as that of the conventional one, but in particular, in the case of the engine control unit of this embodiment, serial communication with the immobilizer unit 17 is enabled.

The details of the engine start check processing performed between the immobilizer unit 17 and the engine control unit 18 will be described later in detail with reference to the engine start processing flowchart of FIG.

On the other hand, the locking / unlocking / alarm control unit 4 is responsible for the above-mentioned wireless locking / unlocking control, and the locking / unlocking / alarm control unit 4 includes the various switch groups 6, 8, 10, 11 described above. , 14 and output necessary signals to an actuator group 21 represented by a solenoid plunger for controlling the locking and unlocking of the door 7. The alarm output from the locking / unlocking / alarm control unit 4 (headlight,
An alarm buzzer, etc.
Is driven to blink, and the alarm horn 13 is driven intermittently. In addition, about how to issue this warning,
Of course, the headlamp 12 may be turned on continuously, or the alarm horn 13 may be driven continuously.

Next, the details of the remote locking / unlocking control processing performed between the portable device 1 and the locking / unlocking / alarm control unit 4 will be described in detail with reference to the remote locking / unlocking control processing flowchart of FIG. I do.

On the side of the locking / unlocking / alarm control unit 4 constituting the on-vehicle device, the state of the door operation switch 14 is always read (step 301), and it is in a state of waiting for any operation to be performed (step 301). 302 NO).

In this state, the driver gets off the car,
When the door 7 is closed and the door operation switch 14 is operated,
It is determined that there is an operation (step 302 YES),
Immediately, a transmission request signal is wirelessly transmitted to the portable device 1 via the transmission / reception antenna 3, and the in-vehicle device waits for the unique code ID1 to be returned from the portable device (step 304NO).

On the other hand, the portable device 1 is always in a state of waiting for a transmission request signal from the vehicle-mounted device side (step 313 NO). With the arrival of the transmission request (step 313 YES), the portable device 1 immediately goes to the vehicle-mounted device. Unique code ID1
(Step 314).

Then, the in-vehicle device receives the unique code ID1 (YES in step 304), and immediately compares the unique code ID1 in the portable device with that in the vehicle (step 305).

If the two do not match (NO at step 306), no control is performed on unlocking and unlocking.
Immediately, the processing on the on-vehicle device side is terminated, and the operation waits for operation of the door operation switch 14 again (steps 301 and 3)
02).

On the other hand, the unique code ID on the portable device side
When it is determined that the number 1 matches the unique code of the on-vehicle device (step 306 YES), the state of the door lock (locked state or unlocked state) at that time is read via the above-mentioned lock state switch (not shown) ( (Step 307) In this case, since the door lock is in the unlocked state, a locking process is subsequently performed (Step 309), and the door lock is locked by the action of the solenoid plunger built in the door 7, and thereafter the vehicle is locked. Is set (step 310).

As described above, the driver or the like carrying the portable device 1 operates the door switch 14 attached to the door 7 lightly with a fingertip, so that the door lock incorporated in the door 7 is locked. On the other hand, as long as the portable device 1 is not possessed, the locking process or the unlocking process is never performed regardless of who operates the door switch 14.

The same applies to the case where the vehicle owner returns to the parking position and unlocks the door of the door 7. In this case, following the unique code matching processing (step 30)
6) Since the door lock is determined to be in the locked state (Step 3)
08), unlocking process (step 311), and alarm flag resetting process (step 312) are executed, and the alert state is reset together with the unlocking of the door lock.

Next, details of the alarm control processing performed in the locking / unlocking / alarm control unit 4 will be described in detail with reference to the alarm control processing flowchart of FIG.

In the alarm control processing program, an alarm flag (step 310 in the flowchart of FIG. 3) is used.
Or controlled in 312) is always read (step 401), and depending on whether the alarm flag is in the set state or the reset state, the warning state or the non-warning state is controlled. Will be

That is, if the alarm flag is determined to be in the reset state (step 402), no alarm operation is performed even if the hood 5, door 7, trunk 9, and key cylinder of the vehicle 2 are abnormal. I can't.

On the other hand, after the alarm flag is read (step 401), if the alarm flag is determined to be in the set state (step 402), the alert process for theft of the vehicle is executed thereafter. . That is, in this alert state, the state of the door open / close state switch 8 for detecting the open / close state of the door is read (step 403), and the state of the hood open / close state switch 6 for detecting the open / close state of the hood 5 is read (step 405). Read the trunk open / close state switch 10 for detecting the open / close state of the trunk 9 (step 407), and read the lock switch for detecting the unlock / unlock state of the door lock (not shown) (step 40).
9) and reading the state of a key cylinder mounting switch (key cylinder tamper switch) 11 for detecting the mounting state of the key cylinder incorporated in the door 7 (step 4).
11) is repeatedly executed.

In this state, the door 7 is open (step 404), the hood 5 is open (step 406),
When any of the open state of the trunk 9 (Step 408), the unlocked state of the door lock (Step 410), and the removal of the key cylinder (Step 412) is detected, the alarm operation is immediately started. (Step 41
3).

In this alarm operation, as described above, the alarm horn 13 is driven intermittently, and an alarm sound is emitted intermittently to surrounding objects with a considerable volume. At the same time, the head lamp 12 repeats blinking, and a warning is visually displayed on the surroundings. for that reason,
By these audible and visual notifications, the surroundings can be notified that some abnormality has occurred in the vehicle 2. This alarm state indicates that the surroundings have some abnormality in the vehicle 2. Is continued by the timer for a time sufficient to detect that the event has occurred. That is, if no alarm stop processing is performed thereafter, this alarm operation is continued for a considerable period of time regardless of whether the person who opened and closed the door is a legitimate driver or a thief. It is done in.

Therefore, in this embodiment, the following processing (steps 414 to 417) is newly added especially for a driver who has lost the portable device 1.
That is, following the start of the alarm operation (step 41)
3), the locking / unlocking / alarm control unit 4 performs communication processing with the immobilizer unit 17 described above, and receives a unique code collation result described later (step 414).

When it is determined that the two unique codes match, that is, when the chip 15 of the mechanical key 15
If the unique code read from a is matched with that of the vehicle and the key code is determined to be normal (step 4).
15YES), immediately, the alarm stop processing (step 416)
Then, an alarm flag reset process (step 417) is executed, and the alarm operation described above is stopped, and the alert state of the vehicle is immediately released. On the other hand, in the immobilizer unit 17, the key cylinder 1
If the unique code read from step 6 does not match that of the vehicle or the unique code itself does not exist (step 415), the above-described alarm stop processing (step 416) and alarm flag reset processing (step 417) ) Is skipped, so that the alarm operation does not stop and continues for a predetermined timer time.

Next, the operation of the immobilizer unit 17 relating to the alarm stop processing (step 416) and the alarm flag reset processing (step 417) which are the characteristics of the present embodiment described above will be described with reference to the engine start processing flowchart of FIG. This will be described in detail with reference to FIG.

On the side of the immobilizer unit 17, when the ignition switch is turned on in the key cylinder 16, the unique code ID2 is immediately read from the key cylinder 16 (step 501). That is, as described above, the mechanical key 15 used in this embodiment has a built-in chip 15a in which a unique code is stored.
Is inserted into the key cylinder 16 and the key cylinder 1
When the key switch constituting 6 is turned to the ignition position, the immobilizer unit 17 operates to read the unique code ID2 from the mechanical key 15.

Subsequently, in the immobilizer unit 17,
The read unique code ID2 (key code) is compared with that of the vehicle (step 502). Here, the most common methods involved in vehicle theft are to imitate only the shape of the mechanical key 15 and forge it, or break the window glass of the door 7 to open the door, and then destroy the key cylinder 16. In some cases, the engine is started by directly connecting the contacts of the built-in switches. In the case of theft by these methods, since the unique code ID2 does not exist, the result of the key code ID2 collation processing (step 502) is as follows. , The key code ID2 does not match (step 502).

Next, communication by serial communication is performed between the immobilizer unit 17 and the engine control unit 18 (step 503).

On the other hand, the engine control unit 18 communicates with the immobilizer unit 17 (step 505), receives the collation result of the key code ID2 through this communication (step 505), and recognizes this as an engine start permission code. (Step 506).

Next, on the engine control unit 18 side,
It is determined whether or not the start of the engine is permitted based on the result of the collation of the key code ID2 (step 50).
7). That is, it is determined that the engine start is permitted only when the unique code ID2 read from the mechanical key 15 matches that of the vehicle, whereas when the two do not match, the engine start is not permitted. Is determined (step 507).

Thereafter, only when the engine start is permitted, normal engine operation processing is performed, whereby normal engine control calculation is performed according to various signals read from the engine sensor group 19, and the injector is operated. When a necessary signal is output to the engine actuator group 21 and the like, and the engine operates normally thereafter, it is determined that the engine start is not permitted (step 5).
(07: NO), the necessary signal to the engine actuator group 20 is immediately stopped, thereby stopping the engine (step 509). Thus, the immobilizer unit 17 and the engine control unit 18 are connected via the communication line. Only when the matching of the unique code is confirmed in the immobilizer unit 17, the normal operation is permitted to the engine control unit 18. From such a viewpoint, the immobilizer unit 17 starts the engine. It can be considered that there is a check.

On the other hand, when the immobilizer unit 17 completes the above-described engine start check processing, the immobilizer unit 17 subsequently communicates with the locking / unlocking / alarm control unit 4 to generate the key code ID2.
Is sent to the locking / unlocking / alarm control unit 4 (step 504).

On the other hand, returning to FIG. 4, as described above, the locking / unlocking / alarm control unit 4 executes the alarm start process (step 413), and then executes the immobilizer unit 1
7 (step 414), and receives the result of collation of the key code ID2 (step 414).

Thereafter, as described above, if the key code is not normal (NO in step 415), the alarm stop processing (step 416) and the alarm flag reset processing (step 417) are skipped while the key If the code is determined to be normal (step 415 YES),
As described above, the alarm stop process (step 416) and the alarm flag reset process (step 417) are immediately executed to stop the alarm operation and release the alert state.

As described above, according to the present embodiment, as shown in the flowchart of FIG. 3, the locking / unlocking process (step 309 or 311) and the alarm flag setting / resetting process (step 310 or 312) Portable device 1
Generally, it is performed only through wireless communication with the lock / unlock / alarm control unit 4.

When the alarm flag is set, that is, when the vehicle is in the alert state, as shown in the flowchart of FIG. 4, the door is open, the hood is open, the trunk is open, and the door is open. In response to the detection of the unlocked state of the lock and the removal state of the key cylinder, the intermittent sounding of the alarm horn 13 and the blinking drive of the headlamp 12 are immediately performed continuously for a certain period of time.

Further, this alarm operation is also performed when the vehicle owner who accidentally spills out the portable device 1 unlocks the door 7 using the appropriate mechanical key 15. Therefore, even when the forgery is imitated by imitating only the shape of the mechanical key 15, theft of the vehicle due to such forgery can be reliably prevented.

On the other hand, the vehicle owner unlocks the door lock using an appropriate mechanical key 15, then inserts the mechanical key 15 into the key cylinder 16, and rotates the ignition switch to the ignition position for starting the engine. As shown in the flowchart of FIG. 5, the immobilizer unit 17 reads and checks the unique code ID2, and only when the two match, the engine control unit 18 is normally started and the operation of the engine is started. Be started. Further, only when the matching match of the unique code ID2 is determined in this way, as shown in the flowchart of FIG.
The alarm control unit 4 performs an alarm stop process, and the alarm performed by the blinking drive of the head lamp 12 and the intermittent drive of the alarm horn 13 is immediately stopped.

As a result, the vehicle owner who has accidentally lost the portable device 1 unlocks the door lock of the door 7 with an appropriate mechanical key 15 and then inserts the mechanical key into the key cylinder 16 to insert the engine into the engine. Is started, the alarm operation is immediately stopped and the alert state can be released. In other words, even if the door 7 is opened using an appropriate engine start key, the alarm operation is performed temporarily, but if the mechanical key is inserted into the key cylinder for the engine start and the engine start operation is performed, Since the alarm operation can be stopped immediately, the alarm horn 13 continues to be turned on and the headlamp 12 keeps blinking for a long time as long as the driver is the vehicle owner and has an appropriate engine start key. Repeated operations can avoid the inconvenience. On the other hand, an appropriate mechanical key is forged in shape, or the window glass of the door 7 is broken and enters the vehicle.
If the engine 6 is destroyed and the engine is started by an illegal means, it is not possible to stop the alarm operation as well as the engine cannot be started. While reliably preventing vehicle theft,
In the case where the driver accidentally loses the portable device 1, it is possible to avoid the inconvenience that the alarm sound continues to be loud even though the vehicle is an appropriate vehicle.

In the above embodiment, the key cylinder 16 is used as a means for reading the unique code built in the mechanical key 15, but it goes without saying that a dedicated code reader may be used separately. In addition, it is needless to say that the immobilizer unit 17 is not always necessary if only consideration is given to stopping the alarm sound for a normal action by the vehicle owner.

In the above embodiment, the unique code ID1 used in the control of door locking and unlocking is distinguished from the unique code ID2 used in the immobilizer unit.
The same code may be used. However, it is better to use a different code to prevent vehicle theft.

Further, in the above embodiment, the control for locking / unlocking / warning is performed by the locking / unlocking / warning control unit 4, but the locking / unlocking / processing and the alarm processing are performed by separate units. Of course, it is also good.

[0066]

According to the invention of claim 1 of this application, when the portable device is lost and the door lock is unlocked with an appropriate engine start key, then the engine start key is read by the reading means. When the door lock is unlocked by a forged engine start key that imitates only the shape, it is possible to immediately stop the alarm operation by reading the unique code built in Cannot stop the alarm operation.

According to the invention of claim 2 of this application, when the portable device is lost and the door lock is unlocked with an appropriate engine start key, the reading means then incorporates it into the engine start key. By reading the specified unique code, the alarm operation can be stopped immediately and the engine can be started normally, whereas the forged engine start key imitating only the shape can lock the door lock. When the unlocking is performed, the alarm operation cannot be stopped or even the engine started.

According to the invention of claim 3 of this application, when the portable device is lost and the door lock is unlocked by a proper mechanical key for starting the engine, the mechanical key is thereafter attached to the key cylinder. If the engine is turned on and the engine is started, the alarm will be stopped automatically when the engine is started, but when the door lock is unlocked using a forged engine starting key that imitates only the shape However, even if the key cylinder is destroyed and the ignition switch is directly connected to stop the alarm operation from the beginning, the engine cannot be started unless the matching match of the unique code is determined.

According to the invention of claim 4 of this application, in addition to the effects of the invention of claims 1 to 3, not only the door lock is unlocked by a forged key but also various locks of the vehicle body are unlocked. In response to the detection of any of the following actions related to vehicle theft, such as opening of the trunk or hood of the vehicle body, removal of the key cylinder of the vehicle body, etc. , Only if you have the right key,
Thereafter, the alarm can be stopped.

According to the invention of claim 5 of the present application, in addition to the effects of the invention of claims 1 to 3, when the door lock is unlocked by a forged key, the door lock cannot be unlocked by a surrounding third party. Audible alerts to discourage such theft.

According to the invention of claim 6 of the present application, in addition to the effects of the invention of claims 1 to 3, when the door lock is unlocked by a forged key, the door lock cannot be unlocked by a surrounding third party. And visually discourage such theft.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the appearance of a vehicle to which a vehicle antitheft device according to the present invention is applied.

FIG. 2 is a block diagram schematically showing a hardware configuration of the vehicle anti-theft device according to the present invention.

FIG. 3 is a flowchart showing details of a remote locking / unlocking control process.

FIG. 4 is a flowchart showing details of an alarm control process.

FIG. 5 is a flowchart showing details of an engine start process.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Portable device 2 Vehicle 3 Transmission antenna 4 Locking / unlocking / alarm control unit 5 Hood 6 Hood opening / closing state switch 7 Door 8 Door opening / closing state switch 9 Trunk 10 Trunk opening / closing state switch 11 Key cylinder tamper switch 12 Headlamp 13 Alarm horn 14 Door operation Switch 15 Mechanical key 15a Chip with built-in unique code 16 Key cylinder 17 Immobilizer unit 18 Engine control unit 19 Engine sensor group 20 Engine actuator group

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-8-150900 (JP, A) JP-A-8-48214 (JP, A) JP-A-2-164645 (JP, A) JP-A 64-64 56253 (JP, A) JP-A-2-164644 (JP, A) JP-A-3-189253 (JP, A) JP-A-1-98877 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60R 25/00-25/10

Claims (6)

(57) [Claims] 1. A portable device having a unique code and a unique code received wirelessly from the portable device are compared with those of a vehicle, and the vehicle is set to a locked / alert state or unlocked at least on condition that the two match. An in-vehicle device for resetting to a locked / non-alert state, and in the locked / alert state, a predetermined alarm operation is performed even when the door is unlocked using an appropriate mechanical key. An anti-theft device for a vehicle, comprising: an engine start key having a built-in electrical unique code; reading means for reading the unique code from the engine start key; and a vehicle having the unique code read by the reading means. A vehicle provided with a collating unit for collating with the collation unit, and an alarming operation stopping unit for stopping the alarming operation on condition of a match judgment in the collating unit. Use anti-theft device. 2. A portable device having a unique code, and a unique code wirelessly received from the portable device is compared with that of a vehicle, and the vehicle is set to a locked / alert state or unlocked on at least a condition that the two match. An in-vehicle device for resetting to a locked / non-alert state, and in the locked / alert state, a predetermined alarm operation is performed even when the door is unlocked using an appropriate mechanical key. An anti-theft device for a vehicle, comprising: an engine start key having a built-in electrical unique code; reading means for reading the unique code from the engine start key; and a vehicle having the unique code read by the reading means. Collating means for collating with that of the engine, and an engine for starting operation of the engine on condition of a coincidence determination by the collating means and stopping the engine on condition of non-coincidence determination. Control means and said collation coincidence judgment said that provided the alarm operation stopping means for stopping the alarm operation of the condition in the unit, a vehicle theft prevention device according to claim. 3. A portable device having a unique code and a unique code wirelessly received from the portable device are compared with those of a vehicle, and the vehicle is set to a locked / alert state or unlocked at least on condition that the two match. An in-vehicle device for resetting to a locked / non-alert state, and in the locked / alert state, a predetermined alarm operation is performed even when the door is unlocked using an appropriate mechanical key. In the anti-theft device for a vehicle, a mechanical key for starting an engine in which a chip storing an electric unique code is embedded, the mechanical key is received by receiving the mechanical key and transmitting high frequency from a built-in coil. A key cylinder for starting the engine, which reads a unique code stored in the chip based on the principle of electromagnetic induction, and a unique code read by the key cylinder. And performs a predetermined control calculation based on signals from various sensors necessary for engine control, and an immobilizer unit having a communication function, based on a result of the calculation. An output signal to a group of actuators necessary for engine control, and an engine control unit having a communication function, and the engine control unit communicates with the immobilizer unit through communication with the immobilizer unit. The unique code collation result is checked, and if they match, the engine operation is started, whereas if they do not match, the engine operation is stopped.Furthermore, the in-vehicle device includes the immobilizer unit and A function to check the unique code collation result through the communication and stop the alarm operation when both match is built in. Being, vehicle theft prevention device according to claim. 4. In the locked / alert state, a door of the vehicle body is opened, various locks of the vehicle body are unlocked,
Performing a predetermined alarm action in response to detecting any of the actions related to vehicle theft, such as opening the trunk or hood of the vehicle body, removing the key cylinder of the vehicle body, etc. The anti-theft device for a vehicle according to any one of claims 1 to 3, characterized in that: 5. The alarm operation according to claim 1, wherein the predetermined alarm operation is to perform an audible alarm such as continuously or intermittently sounding an alarm horn. The anti-theft device for a vehicle according to the above. 6. The vehicle anti-theft device according to claim 1, wherein the predetermined alarm operation is to perform a visual alarm such as blinking of a headlamp. .