JP6539596B2 - Vehicle communication system and vehicle communication method - Google Patents

Description

  The present invention relates to a vehicle communication system and a vehicle communication method.

  For example, as one of the vehicle communication systems, a so-called remote keyless entry system (RKE system) is known which can lock or unlock a door of a vehicle by operating a switch provided on a portable device. (See, for example, Patent Document 1).

  In such an RKE system, whenever the switch of the portable device is operated by the user, the value of the portable device side rolling code is incremented, and a signal including the rolling code and the portable device side identification code (ID code) It is sent from the portable device. When the signal transmitted from the portable device is received by the receiver provided in the vehicle, the receiver transmits the received signal to the control device provided in the vehicle as well. When the signal is thus transmitted, the control device first checks the portable device ID code contained in the signal and the vehicle ID code stored in the memory in the control device.

  Then, if it is determined through this check that the ID codes of each other match, the value of the portable device side rolling code contained in the signal and the rolling stored in the memory in the same control device Compare with code value. As a result, when the value of the portable device side rolling code is larger than the value of the vehicle side rolling code and their difference value is less than the predetermined threshold value, it is determined that the authentication of the portable device is established, The door lock mechanism provided on the vehicle door is driven to lock or unlock the vehicle door. At this time, the control device stores the value of the portable device side rolling code contained in the signal in the memory as a new value of the vehicle side rolling code.

JP 2007-224663 A

  By the way, in the above-described vehicle communication system, for example, a malicious third party acquires a signal A1 including a rolling code transmitted from a portable device at a certain timing and stores it in a device owned by itself and the signal If A1 is prevented from reaching the in-vehicle device, unlocking of the vehicle door is not performed. For this reason, it is conceivable that an authorized user operates the portable device again, but in that case, the signal A2 including the rolling code incremented with respect to the previous signal A1 is transmitted. When a malicious third party acquires this signal A2 and transmits the signal A1 stored in its own device to the in-vehicle device instead of the signal A2, the unlocking of the door of the vehicle is performed. I think that the regular user was able to be unlocked safely by this. However, since the signal A2 is stored in the device possessed by a malicious third party, it is possible to perform a so-called roll jam, which is to unlock the door using this signal A2, and it is possible to Further improvement is desired in terms of

  The present invention has been made in view of these circumstances, and an object thereof is to provide a vehicle communication system and a vehicle communication method capable of improving security.

  In order to solve the above problems, a vehicle communication system includes a portable device-side memory for storing a portable device-side rolling code, and a transmission unit for transmitting a wireless signal including the portable device-side rolling code based on a user's operation. , A receiving unit for receiving the wireless signal, an on-board unit memory storing the on-board unit rolling code, the on-board unit rolling code transmitted from the portable unit, and the on-board unit rolling The first verification is executed to verify the code, and when the verification is established, a vehicle is installed between the on-vehicle device having the first verification section for outputting a signal for locking and unlocking the door and the portable device A second collating unit that performs a second collation accompanying engine start-up, the portable device updating the portable machine side rolling code by a first value at the time of the first collation, the first collation After completion The mobile unit side rolling code is updated by the second value larger than the first value when the collation is established in the second collation, and the in-vehicle device is updated by the update unit of the portable machine When the portable device side rolling code is updated by a second value, a processing unit is provided to perform a process of making the in-vehicle device side rolling code coincide with the portable device side rolling code.

  According to this vehicle communication system, the portable device updates the portable device side rolling code by the first value at the time of the first verification, and the first verification is satisfied in the second verification after the first verification is completed. The portable machine side rolling code is updated by a second value larger than the value of. Then, when the mobile unit side rolling code is updated by the second value by the update unit of the mobile unit, the onboard unit performs processing to match the onboard unit side rolling code with the mobile unit side rolling code. With such a configuration, the in-vehicle device side rolling code and the portable device side rolling code can be updated with a larger value than the normal update (update by the first value). Therefore, even if a malicious third party illegally acquires the portable machine side rolling code at the time of the first collation, the rolling code is higher than the rolling code illegally acquired on the onboard machine side and the portable machine side. Because the value is large, it can not be used by a third party, and security can be improved.

In the vehicle communication system, it is preferable that the second collation by the second collating part be collation based on a key operation accompanying engine start of the vehicle.
According to this vehicle communication system, since it is collation based on the key operation accompanying engine start of the vehicle, the updating of the portable machine side rolling code and the onboard machine side rolling code by the second value triggered by the collation based on the key operation Can be matched with the portable machine side rolling code.

In the vehicle communication system, it is preferable that the second collation by the second collating part be collation using a transponder accompanying engine start of the vehicle.
According to this vehicle communication system, since it is collation using the transponder accompanying engine start of the vehicle, the portable machine side rolling code is only the second value triggered by transponder collation performed before actual engine start. A process of updating and matching the in-vehicle machine side rolling code with the portable machine side rolling code can be performed.

  In order to solve the above problems, a vehicle communication method includes: a portable unit memory storing a portable unit rolling code; and a transmitting unit transmitting a wireless signal including the portable unit rolling code based on a user operation. , A receiving unit for receiving the wireless signal, an on-board unit memory storing the on-board unit rolling code, the on-board unit rolling code transmitted from the portable unit, and the on-board unit rolling The first verification is executed to verify the code, and when the verification is established, a vehicle is installed between the on-vehicle device having the first verification section for outputting a signal for locking and unlocking the door and the portable device A second collating unit that performs a second collation accompanying engine start-up, the portable device updating the portable machine side rolling code by a first value at the time of the first collation, the first collation The above after completion (2) When the collation is established in the collation, the portable unit-side rolling code is updated by a second value larger than the first value, and the on-vehicle unit is updated by the second value by the update unit of the portable unit. When the portable device-side rolling code is updated, the in-vehicle device-side rolling code may be matched with the portable device-side rolling code.

  According to this vehicle communication method, security can be improved.

  The vehicle communication system and the vehicle communication method of the present invention can improve security.

BRIEF DESCRIPTION OF THE DRAWINGS The block block diagram of the vehicle communication system in embodiment. The timing chart for demonstrating the operation example of a vehicle communication system.

Hereinafter, one embodiment of a vehicle communication system will be described according to the drawings.
As shown in FIG. 1, a vehicle communication system 1 according to the present embodiment includes a portable device 3 carried by a user for remotely controlling locking and unlocking of a vehicle door of a vehicle 2 and a vehicle 2 while being mounted on the vehicle 2 And an on-vehicle device 4 that instructs locking and unlocking of the vehicle door through wireless communication with the device 3. The vehicle communication system of the present embodiment is a remote keyless entry system (RKE system) which remotely controls locking and unlocking of the vehicle door from the portable device side.

  The portable device 3 has a lock switch 11 for instructing the locking of the door lock, an unlocking switch 12 for instructing the unlocking of the door lock, and a portable device side control unit responsible for overall control of the portable device 3 And a transmitter 14 for transmitting a signal of radio waves in the UHF band.

  The portable device control unit 13 includes a memory 13a. The memory 13a stores a unique ID code of the portable device 3 and a portable device side rolling code. The portable device control unit 13 transmits an operation signal (wireless signal) including an operation code for instructing locking of the door lock when the lock switch 11 is operated, an ID code, and a rolling code from the transmission unit 14. In addition, the portable device side control unit 13 transmits an operation signal (wireless signal) including an operation code for instructing unlocking of the door lock when the unlock switch 12 is operated, an ID code and a rolling code from the transmission unit 14 . In the present embodiment, the rolling code on the portable device side uses a shared rolling code regardless of whether it is locking or unlocking. That is, if the rolling code at the time of locking at a certain timing is "99", the rolling code at the time of the next unlocking will be "100", and the portable device side control unit 13 will continue to increment (update) It has become.

  The portable device 3 also has a transponder communication circuit 15 (in FIG. 1, denoted as a trapon communication circuit) electrically connected to the portable device side control unit 13. The transponder communication circuit 15 includes a coil, an IC chip, and the like. When the transponder communication circuit 15 receives a drive radio wave from the immobilizer communication device 32 described later, induced power is generated in its own coil. The transponder communication circuit 15 consumes the induced power generated in the coil and transmits a transponder response signal (hereinafter, a trapon response signal) including its own ID code. This trapon response signal is configured the same as the operation signal.

As shown in FIG. 1, the on-vehicle apparatus 4 includes a vehicle control unit 21 and a receiving unit 22 electrically connected to the vehicle control unit 21.
The receiving unit 22 can receive signals of radio waves in the UHF band, and can receive an operation signal transmitted from the transmitting unit 14 on the portable device 3 side.

The vehicle-side control unit 21 has a memory 21a, and the ID code of the portable device registered in the vehicle 2 (in-vehicle device 4) and the in-vehicle device-side rolling code are written and stored.
Further, the vehicle-side control unit 21 outputs a signal for performing processing of a wireless signal received via the receiving unit 22 and locking and unlocking the door to the door lock device 31 to be controlled. More specifically, the vehicle-side control unit 21 obtains the operation code including the operation code on the side of the portable device 3 obtained through the reception unit 22, the ID code and the rolling code, the ID code stored in its own memory 21a, and the rolling. A first collation is performed to collate with the code, and a signal instructing locking / unlocking of the door lock is output to the door lock device 31.

  The door lock device 31 is a device for locking and unlocking the door lock, and unlocks the door lock when a signal instructing unlocking is input from the vehicle side control unit 21 and unlocks the door lock when the locking signal is input. The locking and unlocking state signal indicating the locked and unlocked state of the door lock is output to the vehicle control unit 21 while locking. For this reason, the vehicle-side control unit 21 can recognize the locked / unlocked state of the door lock based on the locked / unlocked state signal.

  As shown in FIG. 1, the vehicle 2 has an immobilizer communication device 32. The immobilizer communication device 32 outputs drive radio waves to the outside. The vehicle-side control unit 21 outputs a command signal to the immobilizer communication device 32, for example, when the brake pedal is depressed while the engine is stopped. The immobilizer communication device 32 transmits drive radio waves based on a command signal from the vehicle control unit 21. Here, for example, in the case where the portable device 3 is a mechanical key, the transponder communication circuit 15 of the portable device 3 is activated by receiving a driving radio wave in a state of being inserted into the key cylinder of the vehicle. Then, the transponder communication circuit 15 transmits a trapon response signal. When receiving the trapon response signal, the immobilizer communication device 32 demodulates the signal into a pulse signal and outputs the pulse signal to the vehicle control unit 21. The vehicle side control part 21 will determine that the transponder collation (following, trapon collation) as a 2nd collation was materialized, if the trapon response signal reception (pulse signal) is output from the immobilizer communication device 32. When the engine of the vehicle 2 is stopped, when the portable device 3 (mechanical key) is operated in a state in which trapon matching is established, the vehicle-side control unit 21 operates the engine through the engine control device 33. When the portable device 3 is a so-called electronic key, the key cylinder is replaced by the engine switch, and a driving radio wave is transmitted in the vicinity of the engine switch. It becomes.

  Further, the immobilizer communication device 32 according to the present embodiment is configured to transmit a verification completion signal for notifying the portable device 3 (the trapone communication circuit 15) that the trapon verification (the second verification) is established, in addition to the driving radio waves. . This is because, for example, when it is determined by the vehicle-side control unit 21 that the trapon verification has been established, the vehicle-side control unit 21 causes the immobilizer communication device 32 to output a verification establishment signal. When the transponder communication circuit 15 receives the collation establishment signal output by the immobilizer communication device 32, the signal is appropriately demodulated and output to the portable device side control unit 13. When the collation establishment signal is input from the transponder communication circuit 15, the portable device side control unit 13 makes the portable device side rolling code stored in the memory 13a larger than the normal value (first value V1 = 1). The second value V2 (for example, "9") is increased. At this time, the vehicle-side control unit 21 is configured to increase the in-vehicle machine side rolling code so as to match the portable machine side rolling code. As a method to match the in-vehicle machine side rolling code and the portable machine side rolling code after starting the engine, an operation signal (an operation code can be omitted) from the portable machine 3 (sending unit 14) to the in-vehicle machine 4 (receiving unit 22) It is conceivable to obtain the latest portable-unit-side rolling code by outputting, and to increase the on-board-unit-side rolling code to match the code. In addition, the method other than this may be used, and it is essential that the in-vehicle machine side rolling cord and the portable machine side rolling cord be matched.

Next, an operation example of the vehicle communication system configured as described above will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1 and FIG. 2, when the unlock switch 12 of the portable device 3 is operated at a certain timing, an operation code for instructing unlocking of the door lock when the unlock switch 12 is operated, ID code And an operation signal including the portable device side rolling code is transmitted from the transmission unit. Let the portable device side rolling code at this time be "100".

  At this time, for example, if an operation signal is acquired by a receiver of a third party, the unlocking operation is not performed on the side of the vehicle 2 (in-vehicle device 4), and the unlock switch 12 is operated again by the user. It will be. At this time, when the unlock switch 12 is operated, the portable device control unit 13 increases the rolling code stored in its own memory 13a by the normal value (first value V1 = 1). That is, the rolling code is "101". Then, an operation signal including the rolling code is output from the transmission unit 14.

  At this time, for example, the operation signal (rolling code = 111) is acquired by the aforementioned third party receiver, and the operation signal including the rolling code in the state of “100” is outputted from the third party transmitter Then, the receiver 22 of the on-vehicle device 4 receives the operation signal. Then, the vehicle-side control unit 21 performs a first comparison that compares the rolling code and the ID code of the operation signal received by the receiving unit 22 with the rolling code and the ID code in the memory 21 a of the vehicle-side control unit 21. Then, when the first comparison is established, the vehicle-side control unit 21 unlocks the vehicle door via the door lock device 31 on the assumption that the received operation signal is a normal operation signal.

  Thereafter, for example, when the user depresses the brake pedal while inserting the portable device 3 (mechanical key) into the key cylinder, the above-mentioned trapon collation is performed, and the vehicle-side control unit 21 is performed when this trapon collation is established. Determines that the second collation is established. Then, the vehicle-side control unit 21 operates the engine through the engine control device 33 by turning the portable device 3 in a state where the trapon verification is established.

  Further, when it is determined by the vehicle-side control unit 21 that the trapon verification has been established, the vehicle-side control unit 21 causes the immobilizer communication device 32 to output a verification establishment signal. When the transponder communication circuit 15 receives the collation establishment signal output by the immobilizer communication device 32, the signal is appropriately demodulated and output to the portable device side control unit 13. When the collation establishment signal is input from the transponder communication circuit 15, the portable device side control unit 13 makes the portable device side rolling code stored in the memory 13a larger than the normal value (first value V1 = 1). The portable device side rolling code is updated to "110" by increasing the second value V2 (for example, "9").

  Then, the vehicle-side control unit 21 increases the in-vehicle machine side rolling code by "10" so as to match the portable machine-side rolling code. More specifically, the latest portable device side rolling code is acquired by outputting an operation signal (the operation code may be omitted) from the portable device 3 (transmission unit 14) to the in-vehicle device 4 (reception unit 22). Increase the onboard rolling code to match the code. By doing this, the latest rolling code becomes "110" and becomes larger than the value (= 101) of the rolling code illegally acquired by the third party, so that the rolling illegally acquired by the third party The code can be invalidated.

As described above, according to the present embodiment, the following effects can be obtained.
(1) The portable device 3 updates the portable device side rolling code by the first value V1 at the time of the first verification, and if the verification is established in the second verification after the first verification is completed, the first value V1 The portable machine side rolling code is also updated by a large second value V2. Then, when the portable device side rolling code is updated by the second value V2 by the vehicle side control unit 21 as the update unit of the portable device 3, the on-vehicle device 4 performs rolling on the portable device side rolling code Perform processing to match the code. With such a configuration, the in-vehicle device side rolling code and the portable device side rolling code can be updated with a value larger than a normal update (update by only the first value V1). Therefore, even if a malicious third party illegally acquires the portable machine side rolling code at the time of the first collation, the rolling code is higher than the rolling code illegally acquired on the onboard machine side and the portable machine side. Because the value is large, it can not be used by a third party, and security can be improved.

  (2) Since it is collation using a transponder that is collation based on key operation accompanying engine start of the vehicle, the portable machine side is only the second value V2 triggered by transponder collation performed before actual engine start The rolling code can be updated and the in-vehicle machine side rolling code can be matched with the portable machine side rolling code.

The above embodiment may be modified as follows.
In the embodiment described above, the trapon collation is adopted as the second collation. However, the present invention is not limited to this, and a configuration in which the second collation is established when the engine is started may be adopted. As an example, the following method can be considered.

  For example, when the vehicle control unit 21 operates the engine through the engine control device 33, the vehicle control unit 21 causes the immobilizer communication device 32 to output an engine start signal. When an engine start signal output by the immobilizer communication device 32 is received by the transponder communication circuit 15, the signal is appropriately demodulated and output to the portable device side control unit 13. When the engine start signal is input from the transponder communication circuit 15, the portable device side control unit 13 makes the portable device side rolling code stored in the memory 13a larger than the normal value (first value V1 = 1). It is increased by the second value V2. As described above, in order to check whether the engine start of the vehicle 2 has been performed, the portable machine side rolling code can be updated by the second value V2 triggered by the start of the engine.

  In the above embodiment, the transponder collation (second collation) is performed by stepping on the brake pedal in a state where the portable device 3 (mechanical key) is inserted into the key cylinder. Or the second collation may be performed when the portable device 3 (mechanical key) is simply inserted into the key cylinder without stepping on the brake pedal. In addition, when the portable device 3 is an electronic key, the transponder verification may be performed only by holding the engine switch (for example, a push button) in the vicinity.

  As described above, it is possible to update the portable device side rolling code and make the in-vehicle device side rolling code coincide with the portable device side rolling code by the second value V2 in response to the transponder verification.

The vehicle communication system 1 can be changed to a system configuration using another communication, format or frequency.
-The above-mentioned embodiment and each modification may be combined suitably.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle communication system, 2 ... Vehicle, 3 ... Portable machine, 4 ... Vehicle-mounted machine, 13a ... Memory (portable machine side memory), 14 ... Transmission part, 21 ... Vehicle side control part (1st collation part, 2nd collation Part and updating part), 21a: memory (vehicle-mounted device side memory), 22: receiving part, V1: first value, V2: second value.

Claims (4)

A portable unit memory including a portable unit-side rolling code, and a transmitting unit configured to transmit a wireless signal including the portable unit-side rolling code based on a user's operation;
A receiving unit for receiving the wireless signal, an in-vehicle device-side memory for storing an in-vehicle device-side rolling code, and a first comparing the portable device-side rolling code and the in-vehicle device-side rolling code transmitted from the portable device An on-vehicle device including a first verification unit that executes a verification and outputs a signal for locking and unlocking the door when the verification is established;
A second verification unit that performs a second verification with the start of a vehicle engine with the portable device;
Have
The portable device updates the portable device side rolling code by a first value at the time of the first collation, and when the collation is established in the second collation after the first collation is completed, the first value The updating unit updates the mobile device side rolling code by a large second value,
The in-vehicle device performs processing to match the in-vehicle device side rolling code with the portable device side rolling code when the portable device side rolling code is updated by the second value by the update unit of the portable device. A vehicle communication system comprising a processing unit.   The vehicle communication system according to claim 1, wherein the second collation by the second collating part is collation based on a key operation accompanying engine start of the vehicle.   The vehicle communication system according to claim 2, wherein the second collation by the second collating part is collation using a transponder accompanying engine start of the vehicle. A portable unit memory including a portable unit-side rolling code, and a transmitting unit configured to transmit a wireless signal including the portable unit-side rolling code based on a user's operation;
A receiving unit for receiving the wireless signal, an in-vehicle device-side memory for storing an in-vehicle device-side rolling code, and a first comparing the portable device-side rolling code and the in-vehicle device-side rolling code transmitted from the portable device An on-vehicle device including a first verification unit that executes a verification and outputs a signal for locking and unlocking the door when the verification is established;
A second verification unit that performs a second verification with the start of a vehicle engine with the portable device;
Have
The portable device updates the portable device side rolling code by a first value at the time of the first collation, and when the collation is established in the second collation after the first collation is completed, the first value Update the mobile side rolling code by a large second value,
The in-vehicle device performs processing to match the in-vehicle device side rolling code with the portable device side rolling code when the portable device side rolling code is updated by the second value by the update unit of the portable device. Vehicle communication method characterized in that.

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