JP2012148602A - Vehicle anti-theft system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle anti-theft system that can reliably prevent stealing.SOLUTION: An ID code stored in a transponder (11) is acquired via a key ring antenna (22). An attestation to determine whether the acquired ID code coincides with an ID code encrypted and stored in an immobilizer ECU (50) is performed, and, if the ID codes coincide, a flag is stored as OK, and if the ID codes do not coincide, the flag is stored as NG. Then, a position of an ignition switch (21) is determined, and if it is in a LOCK position, it is determined whether a key (10) is inserted into a key cylinder (20). Thereafter, when opening and closing of a door is detected by a door switch (30) with a key switch (23) remaining at ON, and when the door of a vehicle is locked with a remote lock system (40), a flag stored as a driver is out of the vehicle is cleared.

Description

  The present invention relates to a vehicle antitheft device, and more particularly to a vehicle start control technology.

  Conventionally, as a vehicle antitheft device for automobiles, an ID code encrypted and stored in a transponder embedded in a key, and an ID code encrypted and stored in an immobilizer electronic control unit (hereinafter referred to as an immobilizer ECU) on the vehicle side There is known an engine immobilizer that performs electronic control so that the engine is started when the ID codes match and the engine is not started when the ID codes do not match.

A general engine immobilizer receives an ID code transmitted from a key transponder when an ignition switch of a vehicle is turned on, and performs authentication communication for collating the received ID code with the ID code of the immobilizer ECU. .
However, for example, when the ignition switch is set to the START position immediately after the key is inserted into the key cylinder and the engine is started, the battery voltage rapidly drops due to the operation of the cell motor, and authentication communication between the key and the immobilizer ECU is performed. May fail.

As described above, if the authentication communication fails, the engine is controlled so as not to start, and the engine may not be started.
Therefore, a technology has been developed that includes a key switch that detects insertion of a key into a key cylinder, and performs authentication communication when the insertion of the key is detected by the key switch (Patent Document 1).

Japanese Patent Laid-Open No. 10-194088

  In the vehicle antitheft device disclosed in Patent Document 1, when the authentication result is discarded by turning off the ignition switch, when the engine is started again, the key is inserted and removed again from the key cylinder, and the key switch is detected by the key switch to perform authentication communication. Since it is required again, the authentication result is held until the key switch is turned off, that is, until the key is removed from the key cylinder.

However, if the key switch detects that the key is always inserted into the key cylinder due to a failure of the key switch or the like, the authentication result is retained even if the key is removed from the key cylinder.
Therefore, if the engine start operation is performed with an unauthorized key having no ID code while the authentication result is held, it is not preferable because the engine starts.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a vehicle theft prevention device that can reliably prevent theft.

  In order to achieve the above object, in the vehicle antitheft device according to claim 1, a vehicle having an ID code, a key in which the ID code is registered, an internal combustion engine of the vehicle by inserting the key and operating the key. A key cylinder for starting, stopping, etc., key detection means for detecting insertion of the key into the key cylinder, and when the key detection means detects the insertion of the key into the key cylinder, the vehicle and A vehicle antitheft device comprising: a control means for authenticating the ID code of the key and holding the authentication result; and controlling the start of the internal combustion engine of the vehicle based on the authentication result. An exit detection means for detecting getting off is provided, and the control means detects the insertion of the key into the key cylinder by the key detection means and holds the authentication result of the ID code. When the key detection means detects that the key has been removed from the key cylinder, or when the getting-off detection means detects the driver's getting off from the vehicle, The authentication result is discarded.

  Further, in the vehicle antitheft device according to claim 2, in claim 1, the getting-off detection means includes a door opening / closing operation detecting means for detecting opening / closing operation of the door of the vehicle, and a remote for locking the door by remote operation. The control means comprises a lock operating means, wherein the control means detects the key being removed from the key cylinder, or the door opening / closing detecting means detects the door opening / closing operation, and then When the door is locked remotely by the locking operation means, the authentication result is discarded.

  The vehicle antitheft device according to claim 3 is characterized in that, in claim 1 or 2, the key detecting means is a key switch provided in the key cylinder.

  According to the first aspect of the present invention, it is provided with the getting-off detecting means for detecting the driver getting out of the vehicle, and when the key detecting means detects the insertion of the key into the key cylinder, the ID code is authenticated The authentication result is held, and when the key detection means detects the removal of the key from the key cylinder, or when the getting-off detection means detects the driver getting out of the vehicle, the held authentication result is discarded. ing.

In this way, since the authentication result held when the driver gets out of the vehicle is discarded, for example, even if the key detecting means fails and it becomes impossible to detect the insertion / removal of the key, the ID code is surely received. The authentication result of can be discarded.
Accordingly, since the authentication result is not held, even if the engine start operation is performed with an unauthorized key having no regular ID code, the engine is not started and theft can be prevented.

  According to a second aspect of the present invention, the getting-off detection means comprises a door opening / closing operation detecting means for detecting an opening / closing operation of a vehicle door, and a remote locking operation means for locking the door by remote operation. If the detection means detects the removal of the key from the key cylinder, or the door opening / closing operation is detected by the door opening / closing detection means, and the door is remotely locked by the remote locking operation means, the authentication result is discarded. I am doing so.

Therefore, it is possible to determine whether the driver gets out of the vehicle and discard the authentication result, and even if the key detecting means breaks down, the authentication result can be surely discarded, and therefore the legitimate ID code is not provided. Even if the engine start operation is performed with an unauthorized key, the engine is not started and theft can be reliably prevented.
According to the invention of claim 3, since the key detecting means is a key switch provided in the key cylinder, it is possible to detect the insertion / removal of the key by using the existing parts, thereby suppressing an increase in cost. , Can surely prevent theft.

1 is a schematic configuration diagram of a vehicle antitheft device according to an embodiment of the present invention. It is a part of flowchart which shows the control routine of the vehicle antitheft device in embodiment of this invention. It is the remainder of the flowchart which shows the control routine of the vehicle antitheft device in embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a schematic configuration diagram of a vehicle antitheft device according to an embodiment of the present invention. The configuration of the embodiment of the present invention will be described below.
As shown in FIG. 1, a vehicle antitheft device 1 according to an embodiment of the present invention is a key for switching start / stop of an engine (internal combustion engine) (not shown) or start of power supply to an in-vehicle electrical component (not shown). 10, a key cylinder 20 into which the key 10 is inserted, a door switch (door opening / closing operation detecting means) 30 for detecting opening / closing of the door, and a remote locking device (remote control) in which the driver locks the door of the vehicle by remote operation. Locking operation means) 40 and a control device for controlling the anti-theft device, including an input / output device, a storage device (ROM, RAM, nonvolatile RAM, etc.), a central processing unit (CPU), etc. Immobilizer electronic control unit (hereinafter referred to as immobilizer ECU) 50 (control means) and engine electronic control for controlling the engine A knit (hereinafter referred to as ENG-ECU) 60, a starting device 71 for starting the engine, a fuel supply device 72 for supplying fuel to the cylinder of the engine, and a fuel / air mixture supplied into the cylinder are ignited. The ignition device 73 is electrically connected.

The key 10 stores an encrypted ID code and includes a transponder 11 that communicates with the vehicle. The transponder 11 is supplied with electric power from the vehicle by electromagnetic coupling when the key 10 is inserted into the key cylinder 20.
The key cylinder 20 includes an ignition switch 21 for switching power supply of the vehicle, a key ring antenna 22 for communicating ID code information with the transponder 11 of the key 10, and a key switch (key detection means) 23 for detecting the insertion of the key 10. It consists of and.

  The ignition switch 21 has a LOCK position, an ACC position, an ON position, and a START position, and any one is selected by operating the key 10. In the LOCK position, the steering wheel of the vehicle is locked, and the supply of electric power to the in-vehicle electrical component and the engine is stopped. Further, at the ACC position, power is supplied only to the on-vehicle electrical components. In addition, the ON position is a position that is selected when the vehicle is traveling by supplying power to the fuel supply device 72, the ignition device 73, and the like of the engine and on-vehicle electrical components. The START position is a position that is selected when the engine is started when the supply of power to the on-vehicle electrical components is stopped and power is supplied to the engine starter 71, fuel supply device 72, ignition device 73, and the like. is there.

  The immobilizer ECU 50 acquires the ID code stored in the transponder 11 of the key 10 via the key ring antenna 22. And it authenticates whether the ID code memorize | stored in the transponder 11 of the acquired key 10 and the ID code encrypted and memorize | stored in immobilizer ECU50 correspond. Then, an engine start permission signal is transmitted to the ENG-ECU 60 based on the authentication result and each information from various sensors.

Next, the control point of the vehicle antitheft device according to the embodiment of the present invention will be described.
FIG. 2 is a flowchart showing a part of a control routine of the vehicle antitheft device according to the embodiment of the present invention. FIG. 3 is a flowchart showing the remainder of the control routine of the vehicle antitheft device according to the embodiment of the present invention.
As shown in FIGS. 2 and 3, in step S <b> 10, it is determined whether or not the key 10 is inserted into the key cylinder 20 by the key switch 23. If the determination result is true (Yes) and the key 10 is inserted into the key cylinder 20, the process proceeds to step S12. If the determination result is false (No) and the key 10 is not inserted into the key cylinder 20, the process returns to step S10 and the process of step S10 is performed again.

In step S <b> 12, the ID code stored in the transponder 11 of the key 10 is acquired via the key ring antenna 22. And it authenticates whether the ID code memorize | stored in the transponder 11 of the acquired key 10 and the ID code encrypted and memorize | stored in immobilizer ECU50 correspond. Then, the process proceeds to step S14.
In step S14, it is determined whether or not the result of the authentication performed in step S12 is OK. If the determination result is true (Yes) and the authentication result is OK, the process proceeds to step S16. If the determination result is false (No) and the authentication result is NG, the process proceeds to step S18.

In step S16, the flag is stored as OK. Then, the process proceeds to step S20.
On the other hand, in step S18, the flag is stored as NG. Then, the process proceeds to step S20.
In step S20, it is determined whether the position of the ignition switch 21 is one of a LOCK position, an ACC position, an ON position, or a START position. If the determination result is the LOCK position, the process proceeds to step S22. If the determination result is the ACC position, the process proceeds to step S30. If the determination result is the ON position or the START position, the process proceeds to step S32.

In step S22, it is determined whether or not the key switch 23 is OFF. If the determination result is true (Yes), the key switch 23 is OFF, and the key 10 is removed from the key cylinder 20, the process proceeds to step S24. If the determination result is false (No) and the key switch 23 is ON, the process proceeds to step S26.
In step S24, the stored flag is cleared (discarded). Then, this routine is returned.

  On the other hand, in step S26, it is determined whether or not the driver has got off the vehicle. That is, it is determined whether or not door opening / closing is detected by the door switch 30 and the locking of the vehicle door is detected using the remote locking device 40. If the determination result is true (Yes) and the door switch 30 detects the opening and closing of the door, and the door of the vehicle is locked using the remote locking device 40, it is determined that the driver has exited from the vehicle. Proceed to If the determination result is false (No) and the door switch 30 does not detect the opening or closing of the door, or if the door of the vehicle is not locked using the remote locking device 40, the driver is not getting off the vehicle. The process proceeds to step S30.

In step S28, the stored flag is cleared (discarded). Then, this routine is returned.
On the other hand, in step S30, the stored flag is held. Then, the process returns to step S20.
In step S32, it is determined whether or not the stored flag is OK. If the determination result is true (Yes) and the stored flag is OK, the process proceeds to step S34. If the determination result is false (No) and the stored flag is NG, the process proceeds to step S36.

In step S34, the key 10 transmits an engine start permission signal to the ENG-ECU 60 as a regular key. That is, the engine is started. Then, the process returns to step S20.
In step S 36, the ID code stored in the transponder 11 of the key 10 is acquired again via the key ring antenna 22. And it authenticates again whether the ID code memorize | stored in the transponder 11 of the key 10 acquired again and the ID code encrypted and memorize | stored in immobilizer ECU50 correspond. Then, the process proceeds to step S38.

In step S38, it is determined whether or not the result of the re-authentication performed in step S34 is OK. If the determination result is true (Yes) and the authentication result is OK, the process proceeds to step S40. If the determination result is false (No) and the authentication result is NG, the process proceeds to step S42.
In step S40, the flag is stored as OK. Then, the process returns to step S34.

On the other hand, in step S42, the flag is stored as NG. Then, the process proceeds to step S44.
In step S44, an engine start non-permission signal is transmitted to the ENG-ECU 60, assuming that the key 10 is using an unauthorized key that is not a regular key. That is, the engine is not started. Then, this routine is returned.

  Thus, in the vehicle antitheft device according to the embodiment of the present invention, the ID code stored in the transponder 11 of the key 10 is obtained via the key ring antenna 22. And it authenticates whether the ID code memorize | stored in the transponder 11 of the acquired key 10 and the ID code encrypted and memorize | stored in immobilizer ECU50 correspond. If the ID codes match, the flag is stored as OK. If the ID codes do not match, the flag is stored as NG. Then, the position of the ignition switch 21 is determined. If the position is the LOCK position, the state of the key switch 23 is determined. If the key switch 23 is ON, and the door switch 30 detects the opening / closing of the door, and if the door of the vehicle is locked using the remote locking device 40, it is stored that the driver has left the vehicle. The flag that has been cleared is cleared (discarded).

  Accordingly, since the authentication result held when the driver gets out of the vehicle is cleared (discarded), for example, the key switch 23 breaks down and it becomes impossible to detect the insertion / removal of the key 10 from the key cylinder 21. However, the flag can be cleared (discarded) without fail, and even if the engine is started with an unauthorized key that does not have a valid ID code, the engine is prevented from starting and the vehicle is stolen. can do.

Further, since the existing key switch 23 is used to insert / remove the key 10 into / from the key cylinder 21, it is possible to suppress the increase in cost and reliably detect the insertion / removal of the key 10.
Although the description of the embodiment of the invention is finished as above, the embodiment of the present invention is not limited to the above embodiment.
In the above embodiment, it is determined whether the driver gets out of the vehicle based on the opening / closing of the door by the door switch 30 and the locking of the door by the remote locking device 40. However, the present invention is not limited to this. A seating sensor may be provided in the driver's seat, and the driver's getting off from the vehicle may be determined based on the output from the seating sensor.

DESCRIPTION OF SYMBOLS 1 Vehicle antitheft device 10 Key 11 Transponder 20 Key cylinder 22 Key ring antenna 23 Key switch (key detection means)
30 Door switch (door open / close motion detection means)
40 Remote locking device (remote locking operation means)
50 Immobilizer ECU (control means)
60 ENG-ECU

Claims (3)

A vehicle having an ID code; a key in which the ID code is registered; a key cylinder in which the key is inserted to start and stop the internal combustion engine of the vehicle by operating the key; and the key to the key cylinder A key detection unit for detecting insertion; and when the key detection unit detects the insertion of the key into the key cylinder, the vehicle and the ID code of the key are authenticated, and the authentication result is held. A vehicle antitheft device comprising control means for controlling the start of the internal combustion engine of the vehicle based on
A getting-off detecting means for detecting the getting off from the vehicle of the driver,
The control means detects the key code from the key cylinder to the key cylinder when the key detection means detects the insertion of the key into the key cylinder and holds the authentication result of the ID code. An anti-theft vehicle anti-theft device that discards the stored authentication result when the unloading of the driver is detected from the vehicle by the unloading detection means. The getting-off detection means
Door opening / closing operation detecting means for detecting the opening / closing operation of the vehicle door;
Comprising a remote locking operation means for locking the door by remote control,
The control means detects the opening of the key from the key cylinder by the key detection means, or detects the opening / closing operation of the door by the door opening / closing detection means and then the door by the remote locking operation means. The vehicle theft prevention device according to claim 1, wherein the authentication result is discarded when the device is locked by remote control.   The vehicle antitheft device according to claim 1, wherein the key detection means is a key switch provided in the key cylinder.

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