JP6867427B2 - Vehicle security system - Google Patents

Description

The present invention relates to a vehicle security system against theft of a vehicle provided with a communication device that wirelessly communicates with the outside.

As a measure against vehicle theft, in Patent Document 1, when an electronic control device connected to an in-vehicle network is illegally replaced or removed, the communication function of the network itself is disabled or deteriorated, so that all or one of the network systems can be used. Disables or reduces the function of the part. In Patent Document 2, when the battery of the vehicle is removed while the engine is stopped, the battery is switched to the auxiliary battery, the anti-theft device is maintained in the operating state, and the theft report processing is performed. In Patent Document 3, when a vehicle is stolen, the vehicle position information and the vehicle information are notified to the reporting center, and a stop command is received from the reporting center to safely stop the vehicle.

Patent Title 3832347 Japanese Unexamined Patent Publication No. 2003-112606 Japanese Unexamined Patent Publication No. 2003-237541

By wirelessly communicating with the outside such as the center device by the communication device mounted on the vehicle, it is possible to report the theft and use the vehicle tracking function based on the vehicle position information. In addition, the vehicle can be stopped by remote control from the center device. However, if the battery is removed or the communication device is removed in order to interfere with these anti-theft measures, the communication device will not function. As a result, the theft cannot be reported, the vehicle tracking function cannot be used, and the vehicle cannot be remotely controlled.

In view of the above, an object of the present invention is to provide a vehicle security system capable of taking measures against theft even if the communication device fails.

The vehicle security system of the present invention includes a communication device mounted on a vehicle and performing wireless communication with the outside, a drive control device for controlling the vehicle drive device, and an anti-theft device for regulating the operation of the drive control device when the vehicle is stolen. The anti-theft device capable of communicating with the communication device and the drive control device communicates with the communication device when the start request of the vehicle drive device is received, and when communication with the communication device is not possible, the drive control device Regulate operation. That is, the vehicle drive device cannot be started. When the vehicle drive is stopped and communication with the communication device is possible, the anti-theft device permits the drive controller to start the vehicle drive upon receiving a request to start the vehicle drive. The vehicle drive can be started.

The anti-theft device regulates the operation of the drive control device and notifies the occurrence of an abnormality when communication with the communication device becomes impossible during the operation of the vehicle drive device. The speed of the vehicle is limited and the vehicle stops. In addition, an abnormality is notified to the outside of the vehicle by light or sound. The drive controller is not regulated if it can communicate with the communication device.

A communication device operated by an in-vehicle battery is equipped with an auxiliary power supply, and when the power supply from the battery is cut off or communication with the anti-theft device becomes impossible, the communication device uses the auxiliary power supply to generate an abnormality to the outside. To report. Even if the communication device is removed, the communication device can be operated by the auxiliary power supply, so that a report can be made.

According to the present invention, if the vehicle is stolen and the function of the communication device is disabled, the vehicle can be immobile. In addition, the theft can be reported, the position of the vehicle can be confirmed, and the stolen vehicle can be tracked.

Schematic block diagram of the vehicle security system according to the embodiment of the present invention Block diagram showing the configuration of a communication device Authentication flowchart when starting the engine Explanatory diagram of anti-theft measures when start authentication cannot be performed when starting the engine Explanatory diagram of anti-theft measures when communication with communication device is not possible while the engine is running

The vehicle security system according to the embodiment of the present invention is shown in FIG. The vehicle security system includes a communication device 1 that wirelessly communicates with the outside, a drive control device 2 that controls a vehicle drive device powered by an engine, and an anti-theft device that regulates the operation of the drive control device 2 when the vehicle is stolen. It has 3 and. Then, the on-board communication device 1, drive control device 2, and anti-theft device 3 are connected to the CAN bus 4 so that they can communicate with each other. Each device operates by supplying power from the battery 5. In addition, other control devices (not shown) such as a body ECU are also connected to the CAN bus 4, and communication with the anti-theft device 3 and the like is possible via the CAN bus 4.

As shown in FIG. 2, the communication device 1 functions as a telematics control unit (TCU), and is an internal communication device that communicates in the vehicle through an external communication device 10 that communicates with the outside and a CAN bus 4. It is composed of 11. The external communication device 10 includes a wireless communication control unit 12 that performs mobile communication, a high-frequency circuit 13 that processes transmission / reception signals, a main antenna 14 and a sub-antenna 15 connected to the high-frequency circuit 13, and GPS from GPS satellite 16. It has a GPS antenna 17 for receiving signals, a GPS receiving unit 18 for processing GPS signals, and a storage unit 19. The external communication device 10 wirelessly communicates with an external center device 20 by mobile communication using a mobile phone network. Further, the external communication device 10 wirelessly communicates with a mobile terminal 21 such as a smartphone or a tablet terminal.

The internal communication device 11 has a CAN control unit 22 that transmits and receives signals through the CAN bus 4. The CAN control unit 22 and the wireless communication control unit 12 are connected to transmit and receive signals to and from each other. The internal communication device 11 and the external communication device 10 function independently of each other. The anti-theft device 3 communicates with the internal communication device 11 and does not communicate with the external communication device 10. Therefore, the external communication device 10 does not communicate with the anti-theft device 3.

The internal communication device 11 includes a backup battery as an auxiliary power source 23, and a power supply control unit 24 for switching between the battery 5 and the auxiliary power source. The communication device 1 is normally operated by a power source supplied from the battery 5. When the power control unit 24 detects that there is no power supply from the battery 5, it switches to power supply from the auxiliary power supply 23. As a result, the communication device 1 can be operated by the auxiliary power supply 23.

The drive control device 2 is an EFI ECU, which starts the engine and controls the output. The anti-theft device 3 is an immobilizer ECU, and immobilizer authentication is performed with the drive control device 2 as an anti-theft measure. That is, the anti-theft device 3 reads and collates the ID code of the transponder of the electronic key, and then collates the drive control device 2 with the encryption code. When the immobilizer authentication is established between the anti-theft device 3 and the drive control device 2 based on the collation result and the start authentication described later is established, the anti-theft device 3 permits the drive control device 2 to start the engine. .. Further, the anti-theft device 3 warns against theft when the door is locked, and operates the body ECU and the meter ECU to issue an alarm when the door, the hood, etc. are illegally unlocked during the warning. ..

Then, when the anti-theft device 3 communicates with the communication device 1, checks for an abnormality with respect to the communication device 1, and detects an abnormality such as removal of the communication device 1 or power interruption from the battery 5, the drive control device 2 Regulate operation. That is, the anti-theft device 3 performs start authentication by communicating with the internal communication device 11 of the communication device 1 when the engine is started as a measure against theft. When the start authentication cannot be performed, the anti-theft device 3 disables the engine start. As described above, since the start authentication cannot be performed through the external communication device 10 accessed from the outside, the security resistance can be improved. Further, even if a problem occurs in the external communication device 10, the internal communication device 11 operates normally, so that the vehicle control is not affected.

As a measure against theft when the engine is operating, the anti-theft device 3 operates the drive control device 2 so as to stop the vehicle when it cannot communicate with the internal communication device 11. Then, the body ECU and the meter ECU are operated so as to issue an alarm. On the other hand, in the communication device 1, when the internal communication device 11 cannot communicate with the anti-theft device 3 or the power supply from the battery 5 is cut off during engine operation, the external communication device 10 is set to the center device according to the instruction of the internal communication device 11. Call 20.

Here, the communication between the anti-theft device 3 and the drive control device 2 and the communication between the anti-theft device 3 and the communication device 1 are performed through the CAN bus 4, but one-to-one communication may be performed through a dedicated line. For example, a CAN local bus, LIN (Local Internet Network), and UART (Universal Asynchronous Receiver / Transmitter) are used to perform dedicated communication between each device.

The start authentication by the anti-theft device 3 is turned on by default. Therefore, when starting the engine, start certification is always performed. However, when performing inspections or battery replacement at the factory, the start certification can be canceled with a dedicated tool. Therefore, even if the anti-theft device 3 is replaced together with the drive control device 2, the start authentication is performed, so that theft can be prevented.

As shown in FIG. 3, when the engine is started, the ignition switch is turned on and the engine starting operation is performed. When the ignition on signal is input to the anti-theft device 3 and the communication device 1, the anti-theft device 3 first confirms the presence or absence of the communication device 1. That is, the anti-theft device 3 confirms whether or not it can communicate with the communication device. When communication is established, the anti-theft device 3 sets the communication establishment flag = 1 and registers the presence of the communication device. Communication is not established when the communication device 1 is not mounted on the vehicle. In this case, the communication establishment flag = 0 is set, and no communication device is registered. This flag is set when the anti-theft device 3 and the communication device 1 communicate with each other for the first time. After that, the presence / absence of the communication device 1 is confirmed by checking the flag without directly performing communication.

After confirming the existence of the communication device, the anti-theft device 3 starts the start authentication. Start authentication is performed by the challenge response method. The start authentication is not limited to this method, and may be performed by the Seed-Key method using a common key.

After the start certification is established, the anti-theft device 3 performs immobilizer certification when it receives an engine start request. When the immobilizer certification is established, the anti-theft device 3 permits the drive control device 2 to start the engine. The drive control device 2 starts the engine.

In a vehicle not equipped with the communication device 1, it is confirmed that there is no communication device. The anti-theft device 3 starts the immobilizer authentication without performing the start authentication. Since start authentication is set to on by default, use a dedicated tool to prevent start authentication. That is, the anti-theft device 3 performs communication authentication with a dedicated tool by a challenge response method. When the communication authentication is possible, the dedicated tool sends a command to cancel the authentication with the communication device 1 at the time of starting the engine, and the anti-theft device 3 sets the start authentication to off when receiving this command.

As shown in FIG. 4, the communication device 1 is removed from the vehicle, the communication is interrupted due to a disconnection of the communication harness connecting the communication device 1 and the anti-theft device 3, or the communication device 1 is transferred to another communication device 1. If replaced, the function of the communication device 1 is invalidated and the start authentication is not established. At this time, the anti-theft device 3 does not perform immobilizer authentication. Since the immobilizer certification is not transferred, the engine start by the drive control device 2 is not permitted and the engine cannot be started. If the immobilizer authentication is not established, the anti-theft device 3 does not allow the engine to start. Therefore, the engine will not start.

When the engine is running, the ignition on signal is always being input. During this time, the anti-theft device 3 checks the communication with the communication device 1. The anti-theft device 3 sends a signal to the internal communication device 11 and receives a reply from the internal communication device 11 to confirm that communication with the communication device is possible.

As shown in FIG. 5, when the power supply from the battery 5 is cut off, such as when the battery 5 is removed from the vehicle or the connector of the power cable is disconnected, the communication device 1 communicates with the anti-theft device 3. become unable. The anti-theft device 3 detects the occurrence of an abnormality due to communication failure and regulates the operation of the drive control device 2. That is, the anti-theft device 3 operates the drive control device 2 so as to limit the vehicle speed. The speed of the vehicle gradually decreases and the vehicle stops. In addition, the body ECU and the meter ECU are operated so as to issue an alarm by light or sound. Notifications are given for abnormal occurrences such as constant lighting of hazard lamps, alarms by buzzers, and horn operation.

On the other hand, in the communication device 1, if the power supply from the battery 5 is cut off when the engine is operating, that is, when the ignition on signal is input, the internal communication device 11 recognizes that an abnormality has occurred. The internal communication device 11 switches to the auxiliary power supply 23 to operate the external communication device 10. The external communication device 10 notifies the center device 20 according to the instruction of the internal communication device 11. Further, when the internal communication device 11 cannot communicate with the anti-theft device 3 during engine operation, the internal communication device 11 recognizes the occurrence of an abnormality and operates the external communication device 10. The external communication device 10 notifies the center device 20 of the occurrence of an abnormality and the position information acquired from GPS according to the instruction of the internal communication device 11. The external communication device 10 also reports to a pre-registered mobile terminal 21, for example, the mobile terminal 21 of the vehicle user. The mobile terminal 21 may be notified from the center device 20. As a result, the position of the vehicle can be specified, and the stolen vehicle can be recovered.

It should be noted that the present invention is not limited to the above embodiment, and it goes without saying that many modifications and changes can be made to the above embodiment within the scope of the present invention. Instead of performing the start authentication first, the immobilizer authentication may be performed first, and then the start authentication may be performed. The anti-theft device 3 may be integrated with the drive control device 2 and the body ECU. Communication between each ECU is performed inside the chip, and theft resistance can be improved.

The vehicle is not limited to a vehicle whose drive source is an engine, and may be a hybrid vehicle whose drive source is an engine and a motor, an electric vehicle or a fuel cell vehicle whose drive source is a motor. The drive control device 2 for the motor turns the motor on and off and controls the rotation speed of the motor. Then, the anti-theft device permits the motor to be turned on and regulates the amount of electricity supplied to the motor.

1 Communication device 2 Drive control device 3 Anti-theft device 5 Battery 10 External communication device 11 Internal communication device 20 Center device 23 Auxiliary power supply

Claims (3)

Communicate device mounted on a vehicle, a drive control device for controlling a vehicle drive unit, and a theft prevention device for regulating the operation of the drive control device when the theft of the vehicle, the anti-theft device comprises a drive motion controller It is a vehicle security system that enables communication, and the communication device is composed of an external communication device that communicates with the outside and an internal communication device that communicates in the vehicle. Acting independently of each other, the anti-theft device does not communicate with the external communication device, but with the internal communication device.
The anti-theft device authenticates the start by communicating with the internal communication device when the vehicle starts, permits the vehicle drive to start when the start authentication is established , and drives when communication with the internal communication device is not possible. A vehicle security system characterized by regulating the operation of control devices. Communicate device mounted on a vehicle, a drive control device for controlling a vehicle drive unit, and a theft prevention device for regulating the operation of the drive control device when the theft of the vehicle, the anti-theft device comprises a drive motion controller It is a vehicle security system that enables communication, and the communication device is composed of an external communication device that communicates with the outside and an internal communication device that communicates in the vehicle. Acting independently of each other, the anti-theft device does not communicate with the external communication device, but with the internal communication device.
The anti-theft device authenticates the start by communicating with the internal communication device when the vehicle starts, and when the start authentication is established, permits the vehicle drive device to start, and while the vehicle drive device is operating, it communicates with the internal communication device. A vehicle security system characterized in that when communication becomes impossible, the operation of the drive control device is regulated and an abnormality occurrence notification operation is performed. Communication device operated by a vehicle-mounted battery, the internal communication device includes an auxiliary power supply, the internal communication device, the power supply from the battery is cut off, or when the communication with the anti-theft device becomes impossible, using the auxiliary power supply The vehicle security system according to claim 2, wherein the external communication device is operated to notify the outside of the occurrence of an abnormality.

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