JP2018141264A - Keyless entry system for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent illegal unlocking of a vehicle door and to improve security.SOLUTION: Storage parts 103, 204 of a portable machine 10 and an on-vehicle machine 20 store a signal pattern list in which a plurality of signal patterns used for generation and reception of an operation signal are consolidated. A pattern determination part 219 for the on-vehicle machine 20 performs determination of a signal pattern of the operation signal, and in the case where the determination is established, it performs collation of a portable machine side counter code and an on-vehicle machine side counter code of the operation signal. In the case where the collation is established, the pattern determination part 219 locks or unlocks the door of a vehicle, and an update part 203 updates the on-vehicle side counter code. In passive communication between the portable machine 10 and the on-vehicle machine 20, pattern determination parts 107, 218 change a signal pattern used for generation and reception of the operation signal.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a vehicle keyless entry system.

  The vehicle keyless entry system includes a portable device possessed by a user of the vehicle and an in-vehicle device mounted on the vehicle. When the user presses the operation button on the portable device, the portable device transmits an operation signal to the portable device. The in-vehicle device that has received the operation signal locks or unlocks the vehicle door. The operation signal includes an ID code. The in-vehicle device collates whether the ID code included in the operation signal matches the ID code assigned to the portable device. As a result, the vehicle door can be locked and unlocked only by the portable device possessed by the user.

  However, if a relay device that can intercept operation signals is used, even a third party can unlock the door illegally. In order to prevent such an unauthorized unlocking by a third party, a vehicular keyless entry system uses a counter code (also referred to as a rolling code) that varies in response to transmission of an operation signal.

  Specifically, each of the portable device and the in-vehicle device holds a portable device-side counter code and an in-vehicle device-side counter code. The portable device updates the counter code after transmitting the portable device-side counter code included in the operation signal. The in-vehicle device that has received the operation signal compares the portable device side counter code included in the operation signal with the in-vehicle device side counter code, and if the operation signal is recognized as being from the portable device as a comparison result, Locking or unlocking is performed, and the in-vehicle device side counter code is updated (for example, see Patent Document 1). Even if the operation signal intercepted by the relay device is transmitted to the in-vehicle device later, the in-vehicle device side counter code has already been updated, so the door of the vehicle is not unlocked.

JP 2007-224663 A

  However, a repeater called Rolljam has been developed. Rolljam performs unauthorized unlocking by intercepting operation signals multiple times while generating jamming radio waves. Specifically, when the user presses the operation button on the portable device, Rolljam intercepts the operation signal transmitted from the portable device and at the same time generates jamming radio waves. The operation signal does not reach the in-vehicle device due to the interference wave, and the vehicle door is not unlocked. Since the door of the vehicle has not been unlocked, the user presses the operation button of the portable device again. Thereby, the portable device transmits a second operation signal. Rolljam also intercepts the second operation signal. Although the second operation signal does not reach the in-vehicle device due to the generation of jamming waves, Rolljam immediately sends the first operation signal intercepted first to the in-vehicle device.

  Since neither the first operation signal nor the second operation signal has reached the in-vehicle device, the in-vehicle device side counter code is not updated. Therefore, the vehicle door is unlocked by the first operation signal sent by Rolljam. It seems to the user that the door is unlocked by pressing the operation button for the second time. Therefore, the user thinks that the door was not unlocked in the first operation only because the communication state was temporarily bad, and does not notice the presence of the repeater. Thereafter, when the user leaves the vehicle, the third party can unlock the door by transmitting the second operation signal stored from Rolljam to the in-vehicle device. That is, by using Rolljam, there is a risk that illegal acts such as vehicle theft will be carried out.

  In a keyless entry system for vehicles, it is required to prevent fraud by Rolljam and improve security.

The present invention includes a portable device carried by a user;
A vehicle-less keyless entry system having an in-vehicle device mounted on a vehicle and performing communication control with the portable device and controlling operation of the in-vehicle equipment,
The portable device is
An operation unit for accepting an operation request for locking or unlocking the vehicle by a user;
A portable device storage unit for storing a portable device side counter code and a plurality of signal patterns;
When the operation unit accepts the operation request, an operation signal generation unit that generates an operation signal including the portable device side counter code using any one signal pattern of the plurality of signal patterns;
A portable transmitter that transmits the operation signal to the in-vehicle device;
A portable device update unit that updates the portable device side counter code when transmitting the operation signal;
A portable device pattern determining unit that determines a signal pattern used for generating the operation signal from the plurality of signal patterns;
With
The in-vehicle device is
An in-vehicle device storage unit for storing the in-vehicle device side counter code and a plurality of signal patterns;
A vehicle pattern determining unit that determines a signal pattern used for receiving the operation signal from the plurality of signal patterns;
A pattern determination unit that determines whether the signal pattern of the operation signal is a signal pattern determined by the in-vehicle device pattern determination unit;
When the determination of the pattern determination unit is established, a collation unit that collates the portable device side counter code included in the operation signal with the onboard unit counter code stored in the onboard unit storage unit,
When verification of the verification unit is established, a door control unit that controls the operation of locking or unlocking the door of the vehicle;
When the verification of the verification unit is established, the in-vehicle device update unit that updates the in-vehicle device side counter code,
An in-vehicle device transmission unit that transmits a response request signal to the portable device during a predetermined operation of the vehicle;
With
The portable device pattern determination unit and the in-vehicle device pattern determination unit are configured to generate a signal pattern used for generation and reception of the operation signal in passive communication between the portable device and the in-vehicle device started by transmission of the response request signal. The configuration is changed.

  ADVANTAGE OF THE INVENTION According to this invention, the fraudulent act with respect to the vehicle of the third party using Rolljam can be prevented, and security can be improved.

It is a figure showing the schematic structure of the keyless entry system for vehicles concerning an embodiment. It is a block diagram which shows the structure of a portable device. (A) is a figure which shows an example of the signal pattern list | wrist which the memory | storage part of a portable device and vehicle equipment stores, (b) is a schematic diagram which shows the structure of an operation signal. It is a block diagram which shows the structure of a vehicle equipment. It is a flowchart which shows the outline of a process of the keyless entry system for vehicles which concerns on embodiment. (A) is a flowchart which shows the process of the portable device in a RKE process, (b) is a flowchart which shows the process of the vehicle equipment in a RKE process. (A) is a flowchart which shows the process of the portable device in passive communication, (b) is a flowchart which shows the process of the vehicle equipment in passive communication. It is a figure which shows the example which applied the keyless entry system for vehicles which concerns on embodiment to the scene where the third party who tries the fraudulent act to a vehicle exists. It is a sequence chart which shows communication of the portable device in a comparative example, vehicle equipment, and Rolljam. It is a sequence chart which shows the communication of the portable device, vehicle equipment, and Rolljam in an application example. (A) is a flowchart which shows the process of the portable device in the passive communication of the modification 1, (b) is a flowchart which shows the process of the vehicle equipment in the passive communication of the modification 1. 10 is a flowchart illustrating processing of a portable device in passive communication according to a second modification. 10 is a flowchart illustrating processing of an in-vehicle device in passive communication according to Modification 2; It is a block diagram which shows the structure of the portable device of the modification 3. (A) is a block diagram which shows the structure of the memory | storage part of the portable device and vehicle equipment of the modification 4, (b) is a figure which shows an example of the signal pattern list | wrist of the modification 4. FIG. It is a figure which shows an example of the signal pattern list | wrist in the further modification of the modification 4.

Hereinafter, a keyless entry system for a vehicle according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of a vehicle keyless entry system (hereinafter referred to as a keyless system K) according to an embodiment of the present invention.

[Keyless system]
As shown in FIG. 1, the keyless system K includes a portable device 10 and an in-vehicle device 20. The portable device 10 is carried by a user of the vehicle and can be carried inside and outside the vehicle. The in-vehicle device 20 is disposed inside the vehicle. In the keyless system K, the portable device 10 communicates with the in-vehicle device 20 in response to a user operation request. Based on the communication result between the portable device 10 and the vehicle-mounted device 20, the vehicle-mounted device 20 locks or unlocks the door of the vehicle. This door locking / unlocking process is hereinafter referred to as RKE (Remote Keyless Entry) process. The in-vehicle device 20 is connected to various in-vehicle equipment other than the door actuator, and also controls the operation of the in-vehicle equipment. The in-vehicle device 20 communicates with the portable device 10 to confirm the location of the portable device 10 when the vehicle performs a predetermined operation in addition to locking and unlocking the door. Communication between the portable device 10 and the in-vehicle device 20 for confirming the location of the portable device 10 is referred to as passive communication. The predetermined operation of the vehicle means the operation of the on-vehicle equipment and the opening / closing operation of the vehicle door.

[Portable machine]
A lock button 11 and an unlock button 12 are provided on one surface of the casing of the portable device 10. The lock button 11 and the unlock button 12 function as an operation unit that receives a user operation request. When the user presses the lock button 11 or the unlock button 12, an operation request for locking or unlocking is input to the portable device 10, and the portable device 10 and the vehicle-mounted device 20 start the RKE process.

FIG. 2 is a block diagram illustrating a configuration of the portable device.
As shown in FIG. 2, the portable device 10 includes a central processing unit (CPU) 100, a storage unit 103, an LF reception unit 104, an RF transmission unit 105, and an input I / F 106. CPU100 is provided with the control part 101, the update part 102, and the pattern determination part 107 as a function structure. The storage unit 103 includes an information storage medium such as a flash memory and a ROM (read-only memory) which are nonvolatile memories, and a RAM (random-access memory) which is a volatile memory. The CPU and the information storage medium are installed inside the casing of the portable device 10. The storage unit 103 stores a control program for the portable device 10. The CPU 100 reads out and executes the control program stored in the storage unit 103, thereby realizing the functional configuration described above. Although not specifically described, each unit of the CPU 100 temporarily stores a processing result in the storage unit 103, reads necessary data and a processing target from the storage unit 103, and resets the temporarily stored data after the processing is completed.

  The storage unit 103 also stores various information necessary for communication with the in-vehicle device 20. In the embodiment of the present invention, the storage unit 103 includes, for example, a signal pattern list, an ID code, function codes A and B, a portable device counter code, a reference value, a counter value, a key for encryption and decryption, and the like. Is remembered. These pieces of information will be described in detail together with descriptions of each part of the portable device 10.

The input I / F 106 is connected to the lock button 11 and the unlock button 12. When the user presses the lock button 11, the input I / F 106 inputs an operation request for locking the vehicle to the control unit 101. When the user presses the unlock button 12, the input I / F 106 inputs an operation request for unlocking the vehicle to the control unit 101.
Note that the lock button 11 and the unlock button 12 do not necessarily need to be configured as separate buttons, and may be configured as an integral button. In that case, for example, the control unit 101 may determine an operation request for unlocking and locking according to the number of times the button is pressed. Specifically, for example, the control unit 101 may determine that the request is an unlocking operation request when the number of times the button is pressed is an odd number, and the locking operation request is when the number of button presses is an even number. .

  The LF receiving unit 104 is connected to the LF receiving antenna 104a. The LF reception antenna 104a receives the LF signal transmitted by the in-vehicle device 20. The LF receiving unit 104 inputs the received LF signal to the control unit 101.

The control unit 101 controls the overall operation of the portable device 10. As will be described in detail later, the control unit 101 generates a command to be input to each unit of the portable device 10 and a signal to be transmitted to the in-vehicle device 20 in accordance with inputs from the LF receiving unit 104 and the input I / F 106. Do.
When the input I / F 106 inputs an operation request, the control unit 101 generates an operation signal to be transmitted to the in-vehicle device 20. The control unit 101 refers to the signal pattern list stored in the storage unit 103 when generating the operation signal.
FIG. 3A is a diagram illustrating an example of a signal pattern list stored in the storage unit 103, and FIG. 3B is a schematic diagram illustrating a configuration of an operation signal.

  As shown in FIG. 3A, the signal pattern list is a list in which a plurality of signal patterns are collected. The signal pattern indicates a signal pattern used for communication between the portable device 10 and the in-vehicle device 20. In the example of FIG. 3A, the signal pattern list describes a pattern 1 that is a bit inversion pattern and a pattern 2 that is a bit non-inversion pattern as a plurality of signal patterns.

  The signal pattern list also describes a use flag for each signal pattern. The use flag specifies a signal pattern to be used when the control unit 101 generates an operation signal. The pattern determination unit 107 describes the use flag. The pattern determination unit 107 sets the use flag of one of the signal patterns to “1” and sets the use flag of the remaining signal pattern to “0”, so that the control unit 101 operates A signal pattern used for signal generation is determined. FIG. 3A shows an example in which the pattern 1 is the usage flag “1” and the pattern 2 is the usage flag “0”. The pattern determination unit 107 rewrites the use flag during passive communication and changes the signal pattern used for generating the operation signal. Details of the change process will be described later.

  The control unit 101 refers to the signal pattern list and generates an operation signal using a signal pattern whose use flag is “1”. That is, if the use flag of pattern 1 is “1”, the control unit 101 performs bit inversion processing on the generated operation signal. If the use flag of pattern 2 is “1”, the control unit 101 does not perform bit inversion processing on the generated operation signal.

As shown in FIG. 3B, the operation signal includes a portable device side counter code, a function code, and an ID code.
The ID code is a unique identification code given to the portable device 10 possessed by the user.
The function codes A and B are codes that specify the content of the operation instructed to the in-vehicle device 20. In the example of the embodiment, an operation instruction for locking is assigned to the function code A and an operation instruction for unlocking is assigned to the function code B in order to instruct the vehicle-mounted device 20 to lock and unlock the door of the vehicle. .
The portable device counter code is a code obtained by encrypting a fixed reference value with a counter value added using a key. By counting up the counter value, the generated portable device counter code is also counted up. In the initial state, for example, the counter value is set to 1.

  When the input I / F 106 inputs an operation request for locking or unlocking, the control unit 101 acquires the corresponding function code A or B, ID code, and portable device side counter code from the storage unit 103 to operate Generate a signal. As described above, if the use flag is pattern 1, the control unit 101 further performs bit inversion processing on the generated operation signal and then outputs it to the RF transmission unit 105. If the use flag is pattern 2, the control unit 101 does not perform bit inversion processing on the generated operation signal and outputs it to the RF transmission unit 105 as it is. After outputting the operation signal, the control unit 101 generates an update command for instructing update of the portable device side counter code and outputs the update command to the update unit 102.

  The RF transmission unit 105 is connected to an RF transmission antenna 105 b for transmitting a signal to the portable device 10. The RF transmission unit 105 modulates the operation signal input by the control unit 101 and transmits it to the in-vehicle device 20 as an RF signal.

When the control unit 101 inputs an update command, the update unit 102 updates the mobile device side counter code by counting up. As a specific process, the update unit 102 first acquires a counter value from the storage unit 103 and counts up. For example, the update unit 102 increments the counter value that was 1 in the initial state to 2. The update unit 102 overwrites the existing counter value with the counted-up counter value. Further, the updating unit 102 encrypts a value obtained by adding the counter value overwritten on the reference value using a key, and generates a new portable device side counter code. As a result of counting up the counter value, the newly generated portable device side counter code results in counting up the existing portable device side counter code. In other words, in the present embodiment, updating of the portable device side counter code means counting up processing of the portable device side counter code. The update unit 102 stores the newly generated portable device side counter code in the storage unit 103 in a form of overwriting the existing portable device side counter code.
Here, the case where the control unit 101 outputs the update command to the update unit 102 after outputting the operation signal has been described, but the update command may be output before the operation signal is output. In other words, the portable device side counter code may be updated when the operation signal is transmitted, and it does not matter before or after the operation signal is transmitted.

  The processing of the control unit 101 when the LF receiving unit 104 inputs an LF signal to the control unit 101 differs depending on the type of the LF signal. The LF signal transmitted by the in-vehicle device 20 includes a response request signal and an authentication signal. Although details will be described later together with the description of the in-vehicle device 20, the in-vehicle device 20 transmits a response request signal and an authentication signal in the passive communication described above.

  Passive communication starts when a response request signal is transmitted from the in-vehicle device 20, and is established when the portable device 10 receives an authentication signal from the in-vehicle device 20. The response request signal is a content for requesting the portable device 10 to transmit a response signal. The authentication signal is a signal for notifying that the response signal transmitted by the portable device 10 has been authenticated. In the embodiment of the present invention, the authentication signal includes a signal pattern change request (hereinafter also simply referred to as “change request”). The change request is a request for causing the pattern determination unit 107 of the portable device 10 to change the signal pattern used for generating the operation signal in the control unit 101 of the portable device 10. As described above, the control unit 101 determines a signal pattern to be used for generating the operation signal with reference to the use flag of the signal pattern list. Therefore, the change request is specifically a request for causing the pattern determination unit 107 to rewrite the use flag of the signal pattern list.

  When the LF receiving unit 104 receives a response request signal, the control unit 101 acquires an ID code from the storage unit 103 and generates a response signal including the ID code. The control unit 101 outputs the generated response signal to the RF transmission unit 105. The RF transmitter 105 modulates the response signal and transmits it to the in-vehicle device 20 as an RF signal.

  When the LF reception unit 104 receives an authentication signal including a change request, the control unit 101 generates a change command and outputs the change command to the pattern determination unit 107 in the same manner as after the operation signal is output. The pattern determination unit 107 rewrites the use flag of the signal pattern list according to the change command. As shown in FIG. 3A, when the signal pattern list describes two signal patterns, the pattern determination unit 107 sets the use flag of the signal pattern whose use flag has been “1” to “0”. To "". Further, the pattern determining unit 107 rewrites the use flag of the signal pattern, which has previously been “0”, to “1”. Specifically, the pattern determination unit 107 rewrites the usage flag of pattern 1 from “1” to “0” and the usage flag of pattern 2 from “0” to “1”. Thus, the pattern determination unit 107 changes the signal pattern used by the control unit 101 to generate the operation signal from the pattern 1 to the pattern 2 by rewriting the use flags of the patterns 1 and 2. Due to this change, when the control unit 101 generates the operation signal next time, the control signal is output to the RF transmission unit 105 without performing the bit inversion processing of the operation signal.

  When there are three or more signal patterns, the order of signal patterns to be used may be determined in advance, and the pattern determination unit 107 may rewrite the use flag according to the order. Alternatively, the order of signal patterns to be used may be determined randomly. However, in the case of randomness, the pattern determining unit 107 may be changed to a signal pattern other than the signal pattern used so far.

  When the change of the signal pattern used for generating the operation signal by the pattern determination unit 107 is completed, the control unit 101 generates a change completion notification and inputs it to the RF transmission unit 105. The control unit 101 includes a signal pattern notification after the change in the change completion notification. When the pattern determination unit 107 changes the signal pattern from pattern 1 to 2, the control unit 101 includes a notification that the changed signal pattern is pattern 2 in the change completion notification. The RF transmission unit 105 modulates the change completion notification into an RF signal, and transmits the RF signal to the in-vehicle device 20 via the RF transmission antenna 105b.

[In-vehicle device]
FIG. 4 is a block diagram illustrating a configuration of the in-vehicle device 20.
As shown in FIG. 4, the in-vehicle device 20 includes a CPU 200, a storage unit 204, an RF reception unit 205, an input I / F 206, an LF transmission unit 209, a door lock I / F 210, a horn I / F 211, a hazard I / F 212, and communication. I / F 213 is provided. The CPU 200 includes a control unit 201, a collation unit 202, an update unit 203, a pattern determination unit 218, and a pattern determination unit 219 as functional configurations. The storage unit 204 is configured by an information storage medium such as a flash memory and a ROM that are nonvolatile memories, and a RAM that is a volatile memory. The storage unit 204 stores a control program for the in-vehicle device 20. The CPU 200 reads and executes the control program stored in the storage unit 204, thereby realizing the functional configuration described above. Although not particularly described, each unit of the CPU 200 temporarily stores the processing result in the storage unit 204, reads out necessary data and a processing target from the storage unit 204, and resets the temporarily stored data after the processing is completed.

  The storage unit 204 also stores information necessary for communication with the portable device 10 and information necessary for controlling the on-vehicle equipment. In the embodiment of the present invention, the storage unit 204 includes, for example, a signal pattern list, an ID code, function codes A and B, an on-vehicle device side counter code, a reference value, a counter value, a key for encryption and decryption, etc. Is remembered. The ID code, function code, reference value, encryption and decryption key are the same as those stored in the storage unit 103 of the portable device 10.

  Regarding the signal pattern list, the storage unit 204 stores the same content as the signal pattern list stored in the storage unit 103 of the portable device 10. That is, as shown in the example of FIG. 3A, the signal pattern list of the in-vehicle device 20 describes pattern 1 that is a bit inversion pattern and pattern 2 that is a bit non-inversion pattern, and uses a flag for each. Is described. In the pattern list of the in-vehicle device 20, the use flag specifies a signal pattern used for receiving the operation signal. The pattern determining unit 218 sets the use flag of one of the signal patterns to “1” and sets the use flag of the remaining signal pattern to “0”, so that the portable device 10 transmits the signal. The signal pattern used for receiving the operation signal is determined. The pattern determination unit 218 rewrites the use flag at the time of passive communication, and changes the signal pattern used for receiving the operation signal. Details of the change process will be described later.

  The counter value is set to be smaller than the counter value stored in the storage unit 103 of the portable device 10. In the initial state, for example, the counter value is set to 0.

  The on-vehicle device side counter code is a code obtained by encrypting a reference value stored in the storage unit 204 with a counter value added using a key. Similarly to the portable device side counter code, when the counter value is counted up, the in-vehicle device side counter code is also counted up. Since the counter value of the in-vehicle device 20 is set to be smaller than the counter value of the portable device 10, the in-vehicle device side counter code is also smaller than the portable device side counter code.

  The LF transmission unit 209 is connected to the LF transmission antenna 209a. The door lock I / F 210 is connected to the door lock actuator 214. The horn I / F 211 is connected to the horn 215. The hazard I / F 212 is connected to the hazard lamp 216. The communication I / F 213 is connected to various other in-vehicle facilities 217. The various in-vehicle facilities 217 are, for example, an air conditioner unit, an audio device, an engine controller, and the like.

  The RF receiving unit 205 is connected to the RF receiving antenna 205a. The RF receiving unit 205 receives the RF signal transmitted from the portable device 10 via the RF receiving antenna 205a. The RF receiving unit 205 performs amplification, conversion, and demodulation of the received RF signal, and outputs the demodulated signal to the control unit 201. As described above, the RF signal transmitted by the portable device 10 is the door unlocking or locking operation signal in the RKE process, the response signal in the passive communication, and the update completion notification.

  The input I / F 206 is connected to various switches 207 and a door opening / closing sensor 208. Various switches 207 connected to the input I / F 206 are, for example, an engine switch, an audio operation switch, and an air conditioner operation switch. When the user operates various switches 207, the input I / F 206 generates operation signals corresponding to the various switches 207 and outputs them to the control unit 201. The input I / F 206 generates a detection signal and outputs the detection signal to the control unit 201 when the door opening / closing sensor 208 detects opening / closing of the door.

The control unit 201 controls the overall operation of the in-vehicle device 20. The control unit 201 generates a command to be input to each unit of the in-vehicle device 20 and a signal to be transmitted to the portable device 10 in accordance with inputs from the RF reception unit 205 and the input I / F 206.
When the RF reception unit 205 inputs an operation signal, the control unit 201 acquires a signal pattern of the operation signal and inputs it to the pattern determination unit 219. The pattern determination unit 219 determines whether the signal pattern of the operation signal matches that determined by the pattern determination unit 218 as the signal pattern used for receiving the operation signal. Specifically, the pattern determination unit 219 determines whether the signal pattern of the operation signal matches the signal pattern whose use flag is “1” in the signal pattern list of the storage unit 204. If both match, the determination is satisfied, and if they do not match, the determination is not satisfied. That is, the above-described pattern determining unit 218 “determines a signal pattern used for receiving an operation signal” means that a signal pattern serving as a determination reference when determining the signal pattern of the operation signal received by the pattern determining unit 219. Means to decide.

  In the example of FIG. 3A, the signal patterns are the pattern 1 of the bit inversion pattern and the pattern 2 of the bit non-inversion pattern, and the use flag of the pattern 1 is “1”. In this case, the pattern determination unit 219 confirms whether or not the operation signal is bit-inverted. If the operation signal is bit-inverted, the determination is satisfied because it matches pattern 1, and if it is not bit-inverted, the determination is not satisfied because it does not match pattern 1. On the other hand, when the pattern 2 is the use flag “1”, the determination is established if the operation signal is not bit-inverted, and the determination is not established if the operation signal is bit-inverted. The pattern determination unit 219 inputs the determination result to the control unit 201.

  The control unit 201 outputs the ID code and the portable device side counter code included in the operation signal to the verification unit 202 only when the determination by the pattern determination unit 219 is established. The collation unit 202 acquires the ID code and the in-vehicle device side counter code from the storage unit 204. The collation unit 202 first collates the ID code of the operation signal with the ID code of the storage unit, and determines whether or not the collation is established. When collation of the ID code is established, the collation unit 202 collates the portable device side counter code with the in-vehicle device side counter code, and determines whether or not the collation is established. The establishment of verification of the portable device side and on-vehicle device side counter codes means that the operation signal can permit the locking or unlocking of the door of the vehicle.

  As for the ID code verification, if the ID code included in the operation signal matches the ID code of the storage unit 204, it is determined that the verification is established, and if it does not match, it is determined that the verification is not established.

  The criteria for determining whether or not the mobile device side and on-vehicle device side counter codes are verified are not limited to specific criteria. For example, when the mobile device-side counter code is larger than the on-vehicle device-side counter code (the mobile device-side counter) Code> vehicle-unit-side counter code), the collation unit 202 determines that collation has been established. That is, when the portable device side counter code is the same as or smaller than the in-vehicle device side counter code, the collation unit 202 determines that the collation is not established.

  Even if the portable device side counter code is larger than the in-vehicle device side counter code, the collation unit 202 may determine that the collation is not established if the difference between the two is larger than the preset allowable value. For example, when the portable device 10 and the vehicle-mounted device 20 cannot communicate with each other, the door may not be locked or unlocked, and the user may press the lock button 11 or the unlock button 12 of the portable device 10 many times. In this case, only the portable device side counter code is updated, and the difference between the portable device side counter code and the in-vehicle device side counter code tends to increase. In consideration of such a case, the divergence between the portable device side counter code and the in-vehicle device side counter code may be allowed to some extent. However, if the divergence between the portable device side counter code and the in-vehicle device side counter code is allowed without limitation, there is a possibility of affecting security. The allowable value can be set as appropriate from the viewpoint of the number of times the user presses and the security point of view.

  The collation unit 202 inputs the collation result to the control unit 201. When the collation of the collation unit 202 is established, the control unit 201 generates a command to be input to the door lock I / F. If the operation signal includes a function code A that is an operation instruction for locking, the control unit 201 generates a lock command that is an instruction for locking. If the operation signal includes a function code B that is an unlocking operation instruction, the control unit 201 generates an unlock command that is an unlocking command. The control unit 201 inputs the generated lock command or unlock command to the door lock I / F 210. The door lock I / F 210 drives the door lock actuator 214 in accordance with the input command to lock or unlock the vehicle door.

  When the collation of the collation unit 202 is established, the control unit 201 outputs an update command that instructs the update unit 203 to update the in-vehicle device side counter code. The update command is an instruction to overwrite the in-vehicle device side counter code with the portable device side counter code. The control unit 201 outputs the update command including the portable device side counter code of the operation signal.

  When the control unit 201 inputs an update command, the update unit 203 updates the in-vehicle device side counter code. Specifically, the update unit 203 first acquires a key from the storage unit 204, and decrypts the portable device side counter code using the key. The update unit 203 acquires the counter value from the decrypted portable device side counter code. The update unit 203 overwrites the existing counter value stored in the storage unit 204 with the acquired counter value. For example, the update unit 203 overwrites the counter value that is 0 in the initial state with 1 that is the counter value of the portable device side counter code.

  The update unit 203 encrypts a value obtained by adding the overwritten counter value to the reference value acquired from the storage unit 204 using a key, and generates a new on-vehicle device side counter code. The update unit 203 overwrites the in-vehicle device side counter code stored in the storage unit 204 with the newly generated in-vehicle device side counter code. Since the counter value of the in-vehicle device 20 is overwritten with the counter value constituting the mobile device side counter code, the newly generated in-vehicle device side counter code is the same as the mobile device side counter code. That is, overwriting the newly generated in-vehicle device side counter code with the existing in-vehicle device side counter code means overwriting the in-vehicle device side counter code with the portable device side counter code.

  As described above, the counter value stored in the storage unit 103 of the mobile device 10 is counted up to 2, for example, in the update process after transmission of the operation signal. The number is smaller than the counter code on the portable device side.

  When the collation of the ID code of the collation unit 202 is not established, and when the collation of the portable device side and the on-vehicle device side counter codes is not established, the control unit 201 does not lock or unlock the door of the vehicle. Furthermore, when collation of the counter code on the portable device side and the vehicle-mounted device side is not established, the control unit 201 inputs an alarm command that is a warning notification command to the horn I / F 211 and the hazard I / F 212. This is because, when the collation of the counter code on the portable device side and the on-vehicle device side is not established, a relay device attempting to unlock such as Rolljam may have transmitted an operation signal. Even when the determination of the signal pattern of the operation signal is not established, there is a possibility that the repeater has transmitted the operation signal. Also in this case, the control unit 201 inputs an alarm command to the horn I / F 211 and the hazard I / F 212.

  The horn I / F 211 generates a drive signal for sounding the horn 215 according to the alarm command, and outputs it to the horn 215. Thereby, the horn 215 outputs a ringing sound based on the input drive signal. When an alarm command is input, the hazard I / F 212 generates a blink signal that causes the hazard lamp 216 to blink, and outputs the blink signal to the hazard lamp 216. The hazard lamp 216 blinks based on the inputted blink signal. That is, in the embodiment of the present invention, the horn I / F 211 and the horn 215, and the hazard I / F 212 and the hazard lamp 216 function as an in-vehicle device notification unit that notifies a warning.

  When the operation signals of the various switches 207 and the detection signals of the door opening / closing sensor 208 are input from the input I / F 206, the control unit 201 generates a response request signal to start passive communication. The response request signal is a content for requesting the portable device 10 to transmit a response signal. As described above, the predetermined operation of the vehicle means the operation of the on-vehicle equipment and the opening / closing operation of the door. Input of operation signals of various switches 207 means that the on-vehicle equipment is operated, and input of detection signals of the door open / close sensor 208 means that the door is opened / closed. Therefore, passive communication is performed at the timing when the operation signal and the detection signal are input.

  The control unit 201 outputs the generated response request signal to the LF transmission unit 209. The LF transmission unit 209 modulates the response request signal input from the control unit 201 into an LF signal, and transmits the LF signal to the portable device 10 via the LF transmission antenna 209a.

  As described above, the portable device 10 transmits a response signal as a response to the response request signal. When the RF reception unit 205 inputs a response signal from the portable device to the control unit 201, the control unit 201 acquires the ID code included in the response signal and outputs the ID code included in the response unit 202. The collation unit 202 acquires the ID code from the storage unit 204 and collates it with the ID code of the response signal. If the ID codes match, the control unit 201 generates an authentication signal including a change request and outputs the authentication signal to the LF transmission unit 209.

  When the control unit 201 inputs a response signal, the LF transmission unit 209 modulates the authentication signal into an LF signal and transmits the LF signal to the portable device 10 via the LF transmission antenna 209a.

  As described above, when the pattern determination unit 107 of the portable device 10 changes the signal pattern used for generating the operation signal in response to the change request, the change completion notification is transmitted from the portable device 10. The change completion notification includes notification of the changed signal pattern in the portable device 10. When a change completion notification is input from the RF reception unit 205, the control unit 201 outputs a change command to the pattern determination unit 218.

  When the control unit 201 inputs the change command, the pattern determination unit 218 refers to the notification of the changed signal pattern included in the change command, and determines the signal pattern used for receiving the operation signal as the changed signal of the portable device 10. Change to the same pattern. For example, when the signal pattern is changed from pattern 1 to 2 in the portable device 10, the pattern determination unit 218 of the in-vehicle device 20 similarly changes the signal pattern from pattern 1 to 2. Specifically, the pattern determination unit 218 changes the use flag of the pattern 2 in the signal pattern list in the storage unit 204 from “0” to “1”. The pattern determination unit 218 also changes the usage flag of the pattern 1 that has been the usage flag “1” until then to “0”. The pattern determination unit 218 changes the signal pattern used for receiving the operation signal from the pattern 1 to the pattern 2 by rewriting the use flags of the patterns 1 and 2.

  As described above, in passive communication, the signal pattern used by the portable device 10 to generate the operation signal is changed, and the in-vehicle device 20 also receives the operation signal so that the signal pattern after the change of the portable device 10 is the same. change. When the keyless system K performs RKE processing after passive communication, the portable device 10 generates and transmits an operation signal of pattern 2. The in-vehicle device 20 locks or unlocks the door of the vehicle only when the operation signal of pattern 2 is received. Even if the operation signal generated in the pattern 1 before the change is received, the determination of the signal pattern in the pattern determination unit 219 is not established, so that the door is not locked or unlocked.

  When communication I / F inputs the operation signal by operation of various switches 207 to the control part 201, the control part 201 not only produces | generates a response request signal, but controls operation | movement of vehicle equipment according to an operation signal. For example, a control signal is transmitted to the air conditioner unit via the communication I / F 213 in response to an operation signal generated by operating the air conditioner operation switch. The air conditioner unit performs air conditioning by changing various settings of the air conditioner based on the control signal.

  For example, the control unit 201 transmits a control signal to the audio device in response to an operation signal generated by operating an audio operation switch. The audio device operates based on the control signal.

  Further, for example, the control unit 201 transmits a control signal to the engine controller in response to an operation signal generated by operating an engine switch. The engine controller controls the engine according to the control signal.

Hereinafter, processing executed in the keyless system K will be described.
When power is supplied to the in-vehicle device 20 and the portable device 10, initial processing is executed. In the initial process, an initialization process of parameters used for the processes in the control units 101 and 201 of the portable device 10 and the in-vehicle device 20 is performed. For example, the counter value of the in-vehicle device 20 is initialized to 1, and the counter value of the portable device 10 is initialized to 0.

FIG. 5 is a flowchart showing an outline of processing in the keyless system K after the initial processing.
As shown in FIG. 5, when the user presses the lock button 11 or the unlock button 12 of the portable device 10 (step S01: Yes), the keyless system K performs the RKE process (step S02). In this RKE process, the keyless system K updates the portable device side counter code and the in-vehicle device side counter code.

  During the predetermined operation of the vehicle (step S01: No, step S03: Yes), the keyless system K performs passive communication (step S04). In passive communication, the keyless system K changes a signal pattern of an operation signal transmitted and received between the portable device 10 and the vehicle-mounted device 20 in the RKE process.

  In addition, in the state where the lock button 11 or the unlock button 12 is not pressed (step S01: No) and the predetermined operation of the vehicle is not performed (step S03: No), the portable device 10 and the vehicle-mounted device 20 save power. Therefore, it shifts to the sleep mode. However, even in the sleep mode, the portable device 10 and the vehicle-mounted device 20 can intermittently cancel the sleep state and receive signals from each other.

Next, details of the RKE process in step S02 of FIG. 5 will be described.
6A is a flowchart showing the process of the portable device 10 in the RKE process, and FIG. 6B is a flowchart showing the process of the in-vehicle device 20 in the RKE process.

  As shown in FIG. 6A, when the lock button 11 or the unlock button 12 of the portable device 10 is pressed, the control unit 101 generates an operation signal for locking or unlocking, and sends it to the RF transmission unit 105. An operation signal is transmitted (step S211). After transmitting the operation signal, the update unit 102 updates the portable device side counter code by the count-up process (step S212).

  As shown in FIG. 6B, when the in-vehicle device 20 receives an operation signal for locking or unlocking from the portable device 10 (step S251: Yes), the control unit 201 acquires a signal pattern of the operation signal, Input to the pattern determination unit 219. The pattern determination unit 219 refers to the storage unit 204 and determines whether the signal pattern of the operation signal matches the signal pattern whose use flag is “1” in the signal pattern list (step S252). When the determination in the pattern determination unit 219 is established (step S252: Yes), the control unit 201 outputs the ID code included in the operation signal and the portable device side counter code to the verification unit 202. If the determination is not satisfied (step S252: No), the control unit 201 does not output to the collation unit 202, outputs a ringing sound to the horn 215, and blinks the hazard lamp 216 to give a warning. Notification is made (step S257).

  The collation unit 202 acquires the ID code and the in-vehicle device side counter code stored in the storage unit 204, and collates with the ID code and the portable device side counter code included in the operation signal (step S253, step S254). In the collation by the collation unit 202, if both ID codes match (step S253: Yes), and the portable device side counter code is larger than the on-vehicle device side counter code (step S254: Yes), the control unit 201 is a door lock actuator. 214 is driven to lock or unlock the door (step S255). In addition, the update unit 203 updates the on-vehicle device side counter code by overwriting processing (step S256).

  If the ID codes do not match in the collation performed by the collation unit 202 (step S253: No), the control unit 201 ends the process without locking or unlocking the door. If the portable device side counter code is equal to or smaller than the in-vehicle device side counter code in the collation by the collation unit 202 (step S254: No), the control unit 201 does not lock or unlock the door. A warning is notified by causing the horn 215 to output a ringing sound and blinking the hazard lamp 216 (step S257).

Next, details of the passive communication process in step S04 of FIG. 5 will be described.
FIG. 7A is a flowchart showing processing of the portable device 10 in passive communication, and FIG. 7B is a flowchart showing processing of the in-vehicle device 20 in passive communication.

  As shown in FIG. 7B, when a predetermined operation of the vehicle, that is, when an operation signal of various switches 207 or a detection signal of the door opening / closing sensor 208 is input from the input I / F 206 of the in-vehicle device 20, the control is performed. The unit 201 generates a response request signal and causes the LF transmission unit 209 to transmit the response request signal (step S451).

  As shown in FIG. 7A, when a response request signal is received from the in-vehicle device 20 (step S411: Yes), the control unit 101 of the portable device 10 generates a response signal and transmits it to the RF transmission unit 105 ( Step S412).

  As shown in FIG. 7B, when the response signal is received from the portable device 10 (step S452: Yes), the collation unit 202 of the in-vehicle device 20 stores the ID code included in the response signal in the storage unit 204. The ID code is collated (step S453). When the ID codes match as a collation result of the collation unit 202 (step S454: Yes), the control unit 201 generates an authentication signal and transmits the authentication signal to the LF transmission unit 209 (step S455). This authentication signal includes a signal pattern change request.

  As shown in FIG. 7A, when receiving the authentication signal from the in-vehicle device 20 (step S413: Yes), the pattern determination unit 107 of the portable device 10 rewrites the use flag of the signal pattern list in the storage unit 103. Thus, the signal pattern used to generate the operation signal is changed (step S414). When the pattern determination unit 107 completes the change, the control unit 101 generates a change completion notification and causes the RF transmission unit 105 to transmit the notification (step S415). The change completion notification includes notification of the signal pattern after the change of the portable device 10.

  As shown in FIG. 7B, when the change completion notification is received from the portable device 10 (step S456: Yes), the pattern determination unit 218 of the in-vehicle device 20 sets the use flag of the signal pattern list in the storage unit 204. By rewriting, the signal pattern used for receiving the operation signal is changed to the same signal pattern after the change of the portable device 10 (step S457).

  In step S452, when the response signal cannot be received from the portable device 10 even after a predetermined time has elapsed (step S452: No), the process returns to step S451, and the control unit 201 of the in-vehicle device 20 retransmits the response request signal. . If the ID codes do not match in step S454 (step S454: No), the process returns to step S451, and the control unit 201 of the in-vehicle device 20 retransmits the response request signal.

  In step S413, if the authentication signal is not received from the in-vehicle device 20 even after a predetermined time has elapsed (step S413: No), the process returns to step S412 and the control unit 101 of the portable device 10 retransmits the response signal.

  In step S456, when the change completion notification is not received from the portable device 10 even after a predetermined time has elapsed (step S456: No), the process returns to step S455, and the control unit 201 of the in-vehicle device 20 retransmits the authentication signal. .

  Note that if the signal cannot be received from the other party even if the re-transmission of each signal is repeated a certain number of times, the control unit 201 of the portable device 10 and the in-vehicle device 20 may end the process.

  Although illustration is omitted, when passive communication is started by operation of various switches 207, the control unit 201 of the in-vehicle device 20 performs operation control of the in-vehicle equipment corresponding to the operation signal after step S457. Do.

[Application example]
An application example of the keyless system K according to the embodiment of the present invention will be described.
FIG. 8 is a diagram illustrating an example in which the keyless system K is applied to a scene where there is a third party who attempts an illegal act such as vehicle theft. As shown in FIG. 8, the third party has Rolljam as a repeater. Rolljam has a function of intercepting RF signals and a function of generating strong interference radio waves. For example, in a place where an unspecified number such as a parking lot can go in and out, a third party is lurking on the user's vehicle side. When the user approaches the vehicle and presses the unlock button 12 of the portable device 10 to unlock the door, the third party operates Rolljam. As a result, Rolljam can intercept the unlocking operation signal transmitted by the portable device 10 and inhibit the operation signal from reaching the in-vehicle device 20 due to the jamming radio wave.

  Here, a comparative example is shown first, and the situation where fraud is possible by Rolljam is explained. The difference between the comparative example and the embodiment is that the comparative example uses only a single signal pattern in transmission / reception of operation signals between the portable device 10 and the vehicle-mounted device 20. Therefore, in passive communication, the portable device 10 and the in-vehicle device 20 do not change the signal pattern. In the RKE process, the pattern determination unit 219 of the in-vehicle device 20 does not determine the signal pattern of the operation signal.

  FIG. 9 is a sequence chart showing communication between the portable device 10, the vehicle-mounted device 20, and the Rolljam in the comparative example. As shown in FIG. 9, the reference value constituting the portable device side counter code and the in-vehicle device side counter code is A, and the initial value of the counter value is 1 for the portable device 10 and 0 for the in-vehicle device 20. As described above, the counter code on the portable device side and the in-vehicle device side is encrypted. However, in the example of FIG. 9, for convenience, a simple addition of the reference value and the counter value is used as the portable device side and the in-vehicle device. Handle as side counter code. That is, the initial value of the portable device side counter code is A + 1, and the initial value of the in-vehicle device side counter code is A + 0. In the example of FIG. 9, only the non-inverted pattern is used as the signal pattern of the operation signal.

  The third party sees the user approaching the vehicle and activates Rolljam to generate jamming. When the user presses the unlock button 12, the portable device 10 transmits an initial operation signal. This first operation signal includes the portable device side counter code A + 1. After transmitting the first operation signal, the portable device 10 updates the portable device side counter code from A + 1 to A + 2.

  Rolljam intercepts the first operation signal transmitted by the portable device 10 and stores it in the memory. Due to the jamming wave, the first operation signal does not reach the vehicle-mounted device 20 and the vehicle door is not unlocked. Therefore, the user presses the unlock button 12 again. When the unlock button 12 is pressed, the portable device 10 transmits a second operation signal. The second operation signal includes the portable device side counter code A + 2. After transmitting the second operation signal, the portable device 10 updates the portable device side counter code from A + 2 to A + 3.

  Rolljam intercepts the second operation signal and stores it in memory. Similarly to the first operation signal, the second operation signal does not reach the vehicle-mounted device 20 due to the jamming radio wave. However, Rolljam stores the second operation signal in the memory, stops the generation of the jamming electric wave, and transmits the first operation signal stored previously to the in-vehicle device 20.

  The in-vehicle device 20 collates the portable device side counter code A + 1 of the first operation signal transmitted by Rolljam with the in-vehicle device side counter code A + 0. In addition, although the vehicle equipment 20 is collating ID code, since it is a premise that ID code corresponds, description is abbreviate | omitted. As a result of the collation, since the portable device side counter code is larger than the onboard device side counter code (A + 1> A + 0), the onboard device 20 unlocks the door of the vehicle. After unlocking, the in-vehicle device overwrites and updates the in-vehicle device side counter code A + 0 with the portable device side counter code A + 1 included in the operation signal.

  In this way, the door of the vehicle is unlocked by Rolljam. At this time, since the user is near the vehicle, a third party cannot perform illegal acts such as vehicle theft. However, since the door of the vehicle is unlocked after the user presses the unlock button 12 for the second time, the possibility that the user notices that the operation signal has been intercepted by a third party is not high. The user simply opens and closes the door of the vehicle and operates various switches. That is, a predetermined operation of the vehicle is performed. Passive communication is performed between the in-vehicle device 20 and the portable device 10 during a predetermined operation of the vehicle. Although passive communication may be performed a plurality of times, an example in which the passive communication is performed only once is shown here. When the in-vehicle device 20 transmits a response request signal, the response request signal reaches the portable device 10 because no interference wave has already been generated. The portable device 10 transmits a response signal to the in-vehicle device 20, and the in-vehicle device 20 collates the ID code included in the response signal and transmits an authentication signal to the portable device 10. In the comparative example, the authentication signal does not include a change request. Therefore, the passive communication process is terminated by transmitting the authentication signal. The portable device side counter code remains A + 3 and the in-vehicle device side counter code remains A + 1 and is not updated.

  After the passive communication, the third party transmits a second operation signal stored in Rolljam to the in-vehicle device 20 when the user leaves the vehicle. The in-vehicle device 20 collates the portable device side counter code A + 2 of the second operation signal with the in-vehicle device side counter code A + 1. Since the mobile device side counter code is larger than the vehicle equipment side counter code (A + 2> A + 1), the vehicle equipment 20 unlocks the door of the vehicle. Unlike the initial unlocking, since the user is away from the vehicle at this time, it becomes possible for a third party to perform an illegal act such as vehicle theft.

  As in this comparative example, when the mobile device side and on-vehicle device side counter codes are updated only by RKE processing, a relay device that intercepts operation signals while generating jamming radio waves such as Rolljam is used. There is a risk that fraudulent acts against three-party vehicles may not be prevented.

Next, an application example of the embodiment will be described. FIG. 10 is a sequence chart showing communication between the portable device 10, the in-vehicle device 20, and the Rolljam in the application example of the embodiment.
As described above, the difference between the application example of the embodiment and the comparative example is that a plurality of signal patterns are used for transmission / reception of operation signals between the portable device 10 and the vehicle-mounted device 20, and a signal pattern used in passive communication is changed. Is to do. In the RKE process, the pattern determination unit 219 of the in-vehicle device 20 determines the signal pattern of the operation signal.

  As shown in FIG. 10, in the initial state, the signal pattern used in the portable device 10 and the in-vehicle device 20 is set to a pattern 1 that is an inverted pattern. Bit inversion processing is performed on the first operation signal and the second operation signal transmitted by the portable device 10.

  The general flow of communication between the portable device 10, the Rolljam, and the in-vehicle device 20 in the RKE process is the same between the application example and the comparative example. That is, Rolljam intercepts the first operation signal and the second operation signal transmitted by the portable device 10 and obstructs arrival at the in-vehicle device 20 by the jamming radio wave. Thereafter, Rolljam transmits the first operation signal to the in-vehicle device 20. However, in the application example, when the first operation signal is received from Rolljam, the in-vehicle device 20 determines the signal pattern of the operation signal. The signal pattern of the first operation signal is a bit inversion pattern and matches the signal pattern used by the in-vehicle device 20. Therefore, as a result, as in the comparative example, the in-vehicle device 20 unlocks the door of the vehicle.

  Thereafter, passive communication is performed between the in-vehicle device 20 and the portable device 10 by a predetermined operation of the vehicle. The in-vehicle device 20 transmits a response request signal to the portable device 10, and the portable device 10 transmits a response signal to the in-vehicle device 20. The in-vehicle device 20 collates the ID code included in the response signal and transmits an authentication signal to the portable device 10. In the application example, the authentication signal includes a change request. Therefore, the portable device 10 that has received the authentication signal changes the signal pattern to be used from the inverted pattern 1 to the non-inverted pattern 2. After completion of the change, the portable device 10 transmits a change completion notification to the in-vehicle device 20. When receiving the change completion notification, the in-vehicle device 20 changes the signal pattern used in the in-vehicle device 20 from the inverted pattern 1 to the non-inverted pattern 2 as in the portable device 10.

  After the passive communication, the third party transmits a second operation signal stored in Rolljam to the in-vehicle device 20 when the user leaves the vehicle. The in-vehicle device 20 determines the signal pattern of the second operation signal. The signal pattern of the second operation signal is the pattern 1 of the reverse pattern before the change, and does not match the pattern 2 that is the signal pattern after the change of the in-vehicle device 20. That is, the determination of the signal pattern of the second operation signal is not established.

  Since determination is not materialized, the vehicle equipment 20 does not unlock the door of a vehicle. The in-vehicle device 20 further issues a warning by causing the horn 215 to output a ringing sound and causing the hazard lamp 216 to blink. As described above, in the application example of the present embodiment, by changing the signal pattern of the operation signal by passive communication, a third party's fraud using Rolljam is prevented. Furthermore, since the warning is notified by the in-vehicle device 20, the possibility that the user who has left the vehicle notices the existence of a third party who attempts to cheat is increased.

As described above, the keyless system K according to the embodiment is
(1) a portable device 10 possessed by a user, and an in-vehicle device 20 that is mounted on a vehicle and performs communication with the portable device 10 and operation control of in-vehicle equipment,
The portable device 10 stores a lock button 11 or an unlock button 12 (operation unit) that accepts an operation request for locking or unlocking the vehicle by a user, and a signal pattern list in which a portable device counter code and a plurality of signal patterns are collected. Storage unit 103 (portable device storage unit) and a control unit that generates an operation signal including a counter code of the mobile device using one of a plurality of signal patterns when the operation unit receives an operation request. 101 (operation signal generation unit), an RF transmission unit 105 (mobile device transmission unit) that transmits an operation signal to the vehicle-mounted device 20, and an update unit 102 (mobile device update) that updates the counter code on the portable device side when the operation signal is transmitted A pattern determining unit 107 (portable device pattern determining unit) that determines a signal pattern used for generating an operation signal from a plurality of signal patterns; Equipped with a,
The in-vehicle device 20 includes a storage unit 204 (an in-vehicle device storage unit) that stores a signal pattern list in which an in-vehicle device side counter code and a plurality of signal patterns are combined, and a signal pattern used for receiving an operation signal from the plurality of signal patterns. The pattern determination unit 218 (vehicle equipment pattern determination unit) to be determined, the pattern determination unit 219 that determines whether the signal pattern of the operation signal is the signal pattern determined by the pattern determination unit 218, and the pattern determination unit 219 determine If it is established, the portable device side counter code included in the operation signal is checked against the in-vehicle device side counter code stored in the storage unit 204, and the portable device side counter code is verified by the verification of the checking unit 202. Control that controls the operation of locking or unlocking the door of the vehicle when the counter code is larger than the side counter code, that is, when verification is established When the collation between 201 and the collation unit 202 is established, an update unit 203 (on-vehicle device update unit) that updates the on-vehicle device side counter code, and a response request signal is transmitted to the portable device 10 during a predetermined operation of the vehicle. LF transmission unit 209 (on-vehicle device transmission unit),
The pattern determining unit 107 and the pattern determining unit 218 are configured to change the signal pattern used for generating and receiving the operation signal in the passive communication between the portable device 10 and the in-vehicle device 20 that is started by transmission of the response request signal.

  Rolljam, which is a relay machine, intercepts the operation signal transmitted from the portable device 10 and simultaneously generates an interference radio wave to block the operation signal from reaching the in-vehicle device 20 and prevent the door from being unlocked. When Rolljam prevents the door from being unlocked, the user presses the operation button of the portable device 10 twice or more, and the first operation signal and the second operation signal transmitted from the portable device 10 are stored. Rolljam records the second operation signal and transmits the first operation signal to the in-vehicle device 20 to unlock the door so that the user does not doubt the presence of the relay device. When the user leaves the vehicle, the third party sends a second operation signal from Rolljam and tries to unlock the door.

  In the keyless system K according to the embodiment of the present invention, the signal pattern used for generating and receiving the operation signal is changed in passive communication after locking or unlocking the door of the vehicle. Therefore, even if the user receives the second operation signal from Rolljam in a gap away from the vehicle, the door is not unlocked because the signal pattern has already been changed. This can prevent third party fraud using Rolljam and improve vehicle security.

(2) The storage unit 103 and the storage unit 204 store the ID code assigned to the portable device 10. In passive communication, the RF transmission unit 105 transmits a response signal including an ID code in response to the response request signal transmitted from the in-vehicle device 20, and the verification unit 202 of the in-vehicle device 20 includes an ID code included in the response signal. Is compared with the ID code stored in the storage unit 204, and if the ID code included in the response signal matches the ID code stored in the storage unit 204, the LF transmission unit 209 sends an authentication signal to the portable device 10. Send. In the passive communication, the LF transmission unit 209 includes a signal pattern change request for the pattern determination unit 107 in the authentication signal. The pattern determining unit 107 changes the signal pattern used for generating the operation signal based on the change request. After changing the signal pattern, the RF transmission unit 105 transmits a change completion notification to the in-vehicle device 20, and when the pattern determination unit 218 of the in-vehicle device 20 receives the change completion notification, the signal pattern used for receiving the operation signal is The pattern determination unit 107 of the portable device 10 changes the signal pattern to the changed signal pattern.

  By including the signal pattern change request in the signal exchanged between the portable device 10 and the in-vehicle device 20 in the passive communication, only the signal pattern change request is not transmitted, and the timing for changing the signal pattern is the third. Hard to grasp.

  In the embodiment, the change request is included in the authentication signal. However, the change request is included in the response request signal transmitted from the in-vehicle device 20 to the portable device 10 when the passive communication is started. Also good. Also in this case, the portable device 10 changes the signal pattern used for generating the operation signal after receiving the authentication signal for establishing the passive communication.

(3) The in-vehicle device 20 includes a horn I / F 211 and a horn 215 or a hazard I / F 212 and a hazard lamp 216 as an in-vehicle device notification unit that notifies a warning. When the determination by the pattern determination unit 219 is not established or when the collation by the collation unit 202 is not established, the horn 215 or the hazard lamp 216 notifies a warning.

  When the signal pattern of the operation signal received by the in-vehicle device 20 does not match the signal pattern determined by the pattern determining unit 218, or when the portable device-side counter code is the same as or smaller than the in-vehicle device-side counter code, There is a high possibility that a third party who intercepts the operation signal by using it is trying to cheat on the vehicle. In that case, it is possible to improve security by notifying the user or people around the vehicle of the possibility of fraud by notifying the warning.

(4) The horn I / F 211 or the hazard I / F 212 blinks the hazard lamp 216 or causes the horn 215 to output an alarm sound as a warning notification. As a warning notification, the use of a hazard lamp 216 that appeals visually or a warning sound that appeals to auditory sense can promptly notify the possibility of fraud.

(5) The storage unit 103 of the portable device 10 and the storage unit 204 of the in-vehicle device 20 include a pattern 1 that is a bit inversion pattern of a signal and a pattern 2 that is a bit non-inversion pattern as a plurality of signal patterns described in the signal pattern list. And remember. The pattern determining unit 107 of the portable device 10 and the pattern determining unit 218 of the in-vehicle device 20 change the signal pattern used for generating and receiving the operation signal to pattern 1 or pattern 2 in passive communication. In the embodiment, the signal pattern can be changed by changing a simple processing procedure such as whether or not to perform the bit inversion processing of the operation signal. It is not necessary to add a hardware configuration to change the signal pattern, and convenience and economy can be improved.

[Modification 1]
In the above-described embodiment, the change request is included in the authentication signal transmitted from the in-vehicle device 20 to the portable device 10. That is, the in-vehicle device 20 requests the portable device 10 to change the signal pattern, and after receiving the change completion notification from the portable device 10, the in-vehicle device 20 sets the signal pattern in accordance with the signal pattern changed by the portable device 10. It was changed. However, the change request is not limited to the request made from the in-vehicle device 20 to the portable device 10, and may be made from the portable device 10 to the in-vehicle device 20. In the first modification, an example in which a change request is included in the response signal transmitted from the portable device 10 to the in-vehicle device 20 in passive communication will be described.

  FIG. 11A is a flowchart showing processing of the portable device 10 in the passive communication of the first modification, and FIG. 11B is a flowchart showing processing of the in-vehicle device 20 in the passive communication of the first modification. is there. The description of the same parts as those in FIGS. 7A and 7B is omitted or simplified.

  As illustrated in FIG. 11B, the control unit 201 of the in-vehicle device 20 generates a response request signal and transmits the response request signal to the LF transmission unit 209 (step S461). As illustrated in FIG. 11A, when a response request signal from the in-vehicle device 20 is received (step S <b> 421: Yes), the control unit 101 of the portable device 10 generates a response signal and transmits the response signal to the RF transmission unit 105. (Step S422). This response signal includes a change request. In the first modification, the change request is a request for causing the pattern determining unit 218 of the in-vehicle device 20 to change the signal pattern used for receiving the operation signal.

  Steps S462 to S465 from when the response signal in FIG. 11B is received until the authentication signal is transmitted are the same as steps S452 to S455 in FIG. However, the response signal received by the mobile device 10 in step S462 includes a change request, and the authentication signal transmitted by the control unit 101 of the mobile device 10 in step S465 does not include the change request. When the authentication signal is transmitted in step S465, the pattern determining unit 218 of the in-vehicle device 20 changes the signal pattern used for receiving the operation signal in accordance with the change request (step S466). When the pattern determination unit 218 completes the change, the control unit 201 of the in-vehicle device 20 generates a change completion notification and causes the LF transmission unit 209 to transmit the notification (step S467). The control unit 201 includes a signal pattern notification after the change in the change completion notification.

  As shown in FIG. 11A, when the portable device 10 receives the authentication signal from the in-vehicle device 20 (step S423) and further receives a change completion notification (step S424: Yes), the pattern of the portable device 10 is obtained. The determination unit 107 changes the signal pattern used for generating the operation signal to the same signal pattern after the change of the in-vehicle device 20 (step S425).

  In step S424, the portable device 10 waits for a change completion notification from the in-vehicle device 20, but if it has not been received even after a predetermined time has elapsed (step S424: No, step S426: Yes), the process proceeds to step S425, and the pattern The signal pattern used by the determination unit 107 for generating the operation signal is changed, and the process ends.

As described above, in the first modification,
(6) In passive communication, the RF transmission unit 105 (mobile device transmission unit) of the portable device 10 includes a signal pattern change request in the response signal transmitted to the on-vehicle device 20, and the pattern determination unit 218 (on-vehicle device). The pattern determining unit changes a signal pattern used for receiving the operation signal based on the change request. The LF transmission unit 209 of the in-vehicle device 20 transmits a change completion notification to the portable device 10 after the signal pattern is changed. When receiving the change completion notification, the pattern determining unit 107 (portable device pattern determining unit) of the portable device 10 changes the signal pattern used for generating the operation signal.

  Similar to the embodiment, by including the change request in the signal transmitted in the passive communication, the change request is not transmitted alone, and it is difficult for a third party to grasp the timing for updating the counter code.

[Modification 2]
In the above-described embodiment, the example in which the signal pattern is always changed during passive communication has been described. However, the case where the signal pattern is changed may be limited. In the second modification, the signal pattern is changed only in passive communication after locking or unlocking the door of the vehicle, that is, after the RKE process, and when the operation of closing the door is performed as a predetermined operation of the vehicle. . In other words, updating is performed only when passive communication is performed in response to the input of the door closing detection signal from the door opening / closing sensor 208.

  In the second modification, the storage unit 204 of the in-vehicle device 20 stores a change flag. The change flag is a flag indicating whether or not the signal pattern needs to be changed. If the change flag is 1, a change is necessary, and if the change flag is 0, a change is not necessary. The initial state of the change flag is 0.

  After the RKE process, that is, the door lock actuator 214 is driven to lock or unlock the door (step S256 in FIG. 6B), and the updating unit 203 updates the on-vehicle device side counter code (FIG. 6). After step S255 of (b), the control unit 201 of the in-vehicle device 20 changes the change flag to 1. When the operation of closing the door is performed as a predetermined operation of the vehicle, the control unit 201 of the in-vehicle device 20 refers to the change flag and changes the signal pattern in passive communication if the change flag is 1. Further, the change flag is returned to 0 after the change is completed.

Hereinafter, the process in the case of the passive communication in the modification 2 is demonstrated using a flowchart.
FIG. 12 is a flowchart showing the processing of the portable device 10 in the passive communication of the second modification.
FIG. 13 is a flowchart illustrating processing of the in-vehicle device 20 in the passive communication according to the second modification.

  Steps S441 to S443 and S445 to S446 in FIG. 12 are the same as steps S411 to S413 and S414 to S415 in FIG. Steps S491 to S494 and S499 to S500 in FIG. 13 are the same as steps S451 to S454 and S456 to S457 in FIG.

  First, the processing of the in-vehicle device 20 will be described. As shown in FIG. 13, after collating the ID code of the response signal (step S494), the control unit 201 refers to the change flag in the storage unit 204. When the change flag is 1 (step S495: Yes) and the passive communication is started by the operation of closing the vehicle door (step S496: Yes), the control unit 201 includes a change request as in the embodiment. An authentication signal is generated and transmitted to the LF transmission unit 209 (step S498). When the change completion notification is received from the portable device 10 (step S499: Yes), the pattern determining unit 218 of the in-vehicle device 20 changes the signal pattern used for receiving the operation signal (step S500). After completion of the change, the control unit 201 of the in-vehicle device 20 sets the change flag to 0 (step S501).

  On the other hand, if No in step S495 or step S496, the signal pattern is not changed, so the process proceeds to step S497, and the control unit 201 of the in-vehicle device 20 generates an authentication signal that does not include the change request, and transmits the LF. The processing is terminated.

  Next, processing of the portable device 10 will be described. As shown in FIG. 12, when the change request is included in the authentication signal received from the in-vehicle device 20 (step S444: Yes), the pattern determination unit 107 of the portable device 10 changes the signal pattern used for generating the operation signal. (Step S445). When the pattern determination unit 107 completes the change, the control unit 101 generates a change completion notification and causes the RF transmission unit 105 to transmit it (step S446). On the other hand, if a change request is not included in the authentication signal (step S444: No), the pattern determination unit 107 of the portable device 10 ends the process without changing the signal pattern.

As described above, in Modification 2,
(7) The pattern determination unit 107 (portable device pattern determination unit) of the portable device 10 and the pattern determination unit 218 (vehicle device pattern determination unit) of the in-vehicle device 20 perform predetermined operations of the vehicle after locking or unlocking the door of the vehicle. In the passive communication when the operation of closing the door is performed, the signal pattern used for generating and receiving the operation signal is changed.

  When a signal pattern change request is transmitted in passive communication, the amount of transmission data increases. When the predetermined operation of the vehicle causing the passive communication is, for example, an operation of an engine start button or the like, there is a possibility that the response to the user's operation may be affected by an increase in the amount of transmission data. In addition, an increase in the total amount of transmission data may affect the memory life of the portable device 10. By limiting the timing of changing the signal pattern, the amount of transmission data can be reduced, and the influence on the responsiveness and the influence on the lifetime of the memory can be reduced.

  In addition, as the predetermined operation of the vehicle, the operation of closing the door is not caused by the operation of the various switches 207 by the user, so even if the transmission data amount increases, the responsiveness to the operation of the user is small. Therefore, it is possible to further reduce the influence on the responsiveness by limiting the timing of the change to the passive communication in the operation of closing the door.

  In the second modification, the example in which the timing of the change is limited to the operation of closing the door as the predetermined operation of the vehicle is not limited to this, but other predetermined operations that have little influence on the responsiveness to the user's operation. It may be limited to operation. For example, you may limit the timing which changes in the operation | movement which opens a door.

  Here, the example in which the third modification is applied to the embodiment has been described. However, the third modification may be applied to the first modification. When applied to the first modification, the change flag is stored in the storage unit 103 of the portable device 10. The control unit 101 of the portable device 10 sets the change flag to 1 after transmitting an operation signal to the in-vehicle device 20 in the RKE process. Further, after the change is made in the passive communication, the change flag is returned to 0.

[Modification 3]
In the above-described embodiment, when the signal pattern determination in the pattern determination unit 219 of the in-vehicle device 20 is not established, or when the collation of the portable device side and the in-vehicle device side counter code of the collation unit 202 is not established, the horn 215 and the hazard The example in which the lamp 216 outputs a ringing sound as a warning notification and blinks the hazard lamp 216 has been described. This notifies the user of the presence of a relay device such as Rolljam that has transmitted an unauthorized operation signal.

  In the third modification, an example in which a warning is notified not only to the in-vehicle device 20 but also to the portable device 10 owned by the user will be described. FIG. 14 is a block diagram illustrating a configuration of the mobile device 10 according to the third modification. As shown in FIG. 14, the portable device 10 includes an output I / F 108 and an alarm lamp 13 as a portable device notification unit in addition to the configuration described in the embodiment. For example, the alarm lamp 13 is installed on the surface of the casing of the portable device 10 on which the lock button 11 and the unlock button 12 are provided. The alarm lamp 13 is connected to the control unit 101 via the output I / F 108. The control unit 101 controls turning on and off of the alarm lamp 13. The control unit 101 blinks the alarm lamp 13 when notifying the warning.

  Since the configuration of the in-vehicle device 20 is not changed from the embodiment, it will be described with reference to FIG. The pattern determining unit 219 of the in-vehicle device 20 determines whether the signal pattern of the received operation signal matches the signal pattern determined by the pattern determining unit 218 as the signal pattern used for receiving the operation signal. In the pattern determination unit 219, when both signal patterns do not match and determination is not established, the control unit 201 generates an alarm signal and transmits it from the LF transmission unit 209 to the portable device 10. When the determination of the pattern determination unit 219 is established, the collation unit 202 of the in-vehicle device 20 collates the portable device side counter code included in the operation signal with the in-vehicle device side counter code stored in the storage unit 204. Even when the portable device-side counter code is the same as or smaller than the vehicle-mounted device-side counter code and the collation of the collation unit 202 is not established, the control unit 201 generates an alarm signal from the LF transmission unit 209 to the portable device 10. Send to.

  When the warning signal is received, the control unit 101 of the portable device 10 generates an alarm command that is a warning notification command and outputs the alarm command to the warning lamp 13 via the output I / F 108. The warning lamp 13 blinks the warning lamp 13 in accordance with the inputted alarm command.

  Here, an example of the alarm lamp 13 has been described as the portable device notification unit, but the present invention is not limited to this. For example, the portable device 10 may be provided with a buzzer that generates an alarm sound, and this may be used as a portable device notification unit. Further, for example, another terminal capable of communicating with the portable device 10 such as a smartphone owned by the user may be used as the portable device notification unit. In that case, the control unit 101 transmits the generated alarm command to the terminal via the RF transmission unit 105. The terminal that has received the alarm command may display, for example, an alarm that notifies the presence of the relay device on the display screen in characters.

As described above, in Modification 3,
(8) The LF transmission unit 209 (on-vehicle device transmission unit) outputs an alarm signal to the portable device 10 possessed by the user when the determination of the pattern determination unit 219 is not established or the collation of the collation unit 202 is not established. Send. The portable device 10 includes an alarm lamp 13 (portable device notification unit) that notifies a user who has the portable device 10 of a warning in response to an alarm signal transmitted from the in-vehicle device 20.

  When an unauthorized operation signal is transmitted from a relay machine such as Rolljam, the user may be away from the vehicle. Even in such a case, by notifying the warning from the portable device 10, it is possible to increase the possibility that the user will notice a third party's fraud.

[Modification 4]
In the above-described embodiment, the bit inversion pattern and the bit non-inversion pattern are described as the plurality of signal patterns described in the signal pattern list. The signal pattern is not limited to these patterns. In the embodiment, the function codes A and B are assigned to the locking operation instruction and the unlocking operation instruction, respectively, and the assignment is fixed. In the fourth modification, an example in which a plurality of signal patterns in which the function code assignment is changed is provided will be described.

FIG. 15A is a block diagram illustrating a configuration of the storage unit 103 of the portable device 10. FIG. 15B is a diagram illustrating an example of a signal pattern list stored in the storage unit 103 of the portable device 10 and the storage unit 204 of the in-vehicle device 20.
As shown in FIG. 15A, in the fourth modification, the storage unit 103 of the portable device 10 stores four function codes A, B, C, and D. Although illustration is omitted, the storage unit 204 of the in-vehicle device similarly stores function codes A, B, C, and D.

  Although the memory | storage part 103 and the memory | storage part 204 have memorize | stored the signal pattern list | wrist similarly to embodiment, the content of the list differs from embodiment. As shown in FIG. 15 (b), the signal pattern list of the modified example 4 includes two patterns 1 and 2 for assigning four function codes A, B, C, and D to the operation instructions for locking and unlocking. doing. In pattern 1, the function code A is assigned to the locking operation instruction, and the function code B is assigned to the unlocking operation instruction. In pattern 2, the function code C is assigned to the locking operation instruction, and the function code A is assigned to the unlocking operation instruction. The signal pattern list describes a use flag for each signal pattern. Similarly to the embodiment, the portable device 10 and the vehicle-mounted device 20 use the signal pattern whose use flag is “1” for generation and reception of the operation signal.

  The pattern determination unit 107 of the portable device 10 and the pattern determination unit 218 of the in-vehicle device 20 change the signal pattern used for generation and reception of the operation signal in passive communication, as in the embodiment. The change is performed by rewriting the use flag as in the embodiment.

  The control unit 101 of the portable device 10 generates an operation signal according to the signal pattern whose use flag is “1” with reference to the signal pattern list. If the use flag of pattern 1 is “1”, the control unit 101 includes the function code A in the case of locking and the function code B in the case of unlocking in the operation signal. If the use flag of pattern 2 is “1”, the control unit 101 includes the function code C in the case of locking and the function code D in the case of unlocking in the operation signal.

  The pattern determination unit 219 of the in-vehicle device refers to the signal pattern list to determine whether or not the function code included in the operation signal is indicated by the signal pattern whose use flag is “1”. If the determination by the pattern determination unit 219 is established, the control unit 201 outputs the ID code and the portable device side counter code included in the operation signal to the verification unit 202. When the determination by the pattern determination unit 219 is not established, there is a possibility that the repeater has transmitted an operation signal. The control unit 201 inputs an alarm command to the horn I / F 211 and the hazard I / F 212. When the modification 4 is applied to the modification 3, the control unit 201 generates an alarm signal and transmits the alarm signal from the LF transmission unit 209 to the portable device 10.

As described above, in Modification 4,
(9) The storage unit 103 of the portable device 10 and the storage unit 204 of the in-vehicle device 20 are locked or unlocked as a plurality of function codes A, B, C, and D included in the operation signal and a plurality of signal patterns 1 and 2. A plurality of allocation patterns of function codes A, B, C, and D corresponding to the operation instructions are stored. The pattern determining unit 107 of the portable device 10 and the pattern determining unit 218 of the in-vehicle device 20 change the allocation pattern used for generating and receiving the operation signal in passive communication.

  Also in the modified example 4, as in the embodiment, the signal pattern used for generating and receiving the operation signal is changed in passive communication after locking or unlocking the door of the vehicle. Therefore, even if the user receives the second operation signal from Rolljam in a gap away from the vehicle, the door is not unlocked because the signal pattern has already been changed. This can prevent third party fraud using Rolljam and improve vehicle security. Further, in the fourth modification, the control unit 201 only needs to replace the function code included in the operation signal when the signal pattern is changed, so that bit inversion processing is not required, and the processing efficiency of operation signal generation is improved. Can do.

  The number of function codes and their allocation pattern are not limited to the example shown in FIG. FIG. 16 is a diagram illustrating an example of a signal pattern list in a further modification of the fourth modification. FIG. 16 shows an allocation pattern in the case of having only two function codes A and B as in the embodiment. In pattern 1, function code A is assigned to lock and function code B is assigned to unlock. Pattern 2 is obtained by replacing pattern 1 and assigns function code B for locking and function code A for unlocking. Even in this case, when the second operation signal intercepted by Rolljam is transmitted, the function code of the second operation signal in the in-vehicle device 20 is changed to one that instructs the operation of locking instead of unlocking. Therefore, the door of the vehicle is not unlocked and it is possible to prevent third party fraud. In addition, since the allocation pattern of FIG. 16 only replaces the two function codes A and B, even if the pattern determination unit 219 of the in-vehicle device 20 confirms the function code included in the operation signal, the operation signal is received. It cannot be determined whether it matches the signal pattern used. When the allocation pattern of FIG. 16 is used, the determination by the pattern determination unit 219 is not performed.

  The plurality of function code assignment patterns shown in FIG. 15B and FIG. 16 may be used in combination with the bit inversion pattern and the bit non-inversion pattern described in the embodiment. Thereby, security can be further improved. In particular, the combination of the two function code A and B allocation patterns shown in FIG. 16 and the bit inversion pattern and non-inversion pattern allows the pattern determination unit 219 to operate the signal pattern of the operation signal without increasing the number of function codes. Can be determined.

K keyless entry system for vehicles (keyless system)
10 Mobile device 20 On-vehicle device 11 Lock button (operation part)
12 Unlock button (operation unit)
13 Alarm lamp (portable device alarm section)
100 CPU
101 Control unit (operation signal generation unit)
102 Update unit (mobile device update unit)
103 storage unit (mobile device storage unit)
104 LF reception unit 104a LF reception antenna 105 RF transmission unit (portable device transmission unit)
105b RF transmitting antenna 106 Input I / F
107 pattern determination unit (mobile device pattern determination unit)
108 Output I / F (Portable Device Notification Unit)
200 CPU
201 Control Unit 202 Verification Unit 203 Update Unit (In-vehicle Device Update Unit)
204 Storage unit (onboard unit storage unit)
205 RF receiving unit 205a RF receiving antenna 206 Input I / F
207 Various switches 208 Door open / close sensor 209 LF transmitter (on-vehicle device transmitter)
209a LF transmitting antenna 210 Door lock I / F
211 Horn I / F (in-vehicle device notification unit)
212 Hazard I / F (in-vehicle device notification unit)
213 Communication I / F
214 Door lock actuator 215 horn (in-vehicle device notification unit)
216 Hazard lamp (in-vehicle device notification unit)
217 Various in-vehicle equipment 218 Pattern determination unit 219 Pattern determination unit

Claims (12)

A portable device owned by the user;
A vehicle-less keyless entry system having an in-vehicle device mounted on a vehicle and performing communication control with the portable device and controlling operation of the in-vehicle equipment,
The portable device is
An operation unit for accepting an operation request for locking or unlocking the vehicle by a user;
A portable device storage unit for storing a portable device side counter code and a plurality of signal patterns;
When the operation unit accepts the operation request, an operation signal generation unit that generates an operation signal including the portable device side counter code using any one signal pattern of the plurality of signal patterns;
A portable transmitter that transmits the operation signal to the in-vehicle device;
A portable device update unit that updates the portable device side counter code when transmitting the operation signal;
A portable device pattern determining unit that determines a signal pattern used for generating the operation signal from the plurality of signal patterns;
With
The in-vehicle device is
An in-vehicle device storage unit for storing the in-vehicle device side counter code and a plurality of signal patterns;
A vehicle pattern determining unit that determines a signal pattern used for receiving the operation signal from the plurality of signal patterns;
A pattern determination unit that determines whether the signal pattern of the operation signal is a signal pattern determined by the in-vehicle device pattern determination unit;
When the determination of the pattern determination unit is established, a collation unit that collates the portable device side counter code included in the operation signal with the onboard unit counter code stored in the onboard unit storage unit,
When verification of the verification unit is established, a control unit that controls the operation of locking or unlocking the door of the vehicle;
When the verification of the verification unit is established, the in-vehicle device update unit that updates the in-vehicle device side counter code,
An in-vehicle device transmission unit that transmits a response request signal to the portable device during a predetermined operation of the vehicle;
With
The portable device pattern determination unit and the in-vehicle device pattern determination unit are signal patterns used for generation and reception of the operation signal, respectively, in passive communication between the portable device and the in-vehicle device started by transmission of the response request signal. A keyless entry system for vehicles.   Either one of the portable device and the vehicle-mounted device includes a signal pattern change request for the other pattern determination unit in a signal transmitted in the passive communication, and the other pattern determination unit includes the signal pattern change request. The vehicle keyless entry system according to claim 1, wherein the signal pattern is changed based on the key. The other transmission unit transmits a change completion notification to the one after the other pattern determination unit changes the signal pattern,
3. The keyless entry system for a vehicle according to claim 2, wherein, when the one pattern determination unit receives the change completion notification, the one pattern determination unit changes the signal pattern to the signal pattern changed by the other pattern determination unit. . The portable device storage unit and the in-vehicle device storage unit store an ID code given to the portable device,
In the passive communication,
The portable device transmission unit transmits a response signal including the ID code in response to the response request signal transmitted from the in-vehicle device,
The collation unit of the in-vehicle device collates the ID code included in the response signal with the ID code stored in the in-vehicle device storage unit,
When the ID code included in the response signal matches the ID code stored in the in-vehicle device storage unit, the in-vehicle device transmission unit transmits an authentication signal to the portable device,
In the passive communication,
The in-vehicle device transmission unit includes a signal pattern change request in the response request signal or the authentication signal,
The portable device pattern determination unit changes a signal pattern used for generating the operation signal based on the signal pattern change request,
The portable device transmission unit transmits a change completion notification to the in-vehicle device after the signal pattern is changed,
The said vehicle equipment pattern determination part changes the signal pattern used for reception of the said operation signal to the signal pattern which the said portable device pattern determination part changed, if the said notification of completion of a change is received. Keyless entry system for vehicles. The portable device storage unit and the in-vehicle device storage unit store an ID code given to the portable device,
In the passive communication,
The portable device transmitting unit transmits a response signal including the ID code in response to a response request signal transmitted from the in-vehicle device,
The collation unit of the in-vehicle device collates the ID code included in the response signal with the ID code stored in the in-vehicle device storage unit,
When the ID code included in the response signal matches the ID code stored in the in-vehicle device storage unit, the in-vehicle device transmission unit transmits an authentication signal to the portable device,
In the passive communication,
The portable device transmission unit includes a signal pattern change request in the response signal, and the in-vehicle device pattern determination unit changes a signal pattern used for receiving the operation signal based on the signal pattern change request,
The in-vehicle device transmission unit transmits a change completion notification to the portable device after the signal pattern is changed,
The said portable machine pattern determination part changes the signal pattern used for the production | generation of the said operation signal to the signal pattern which the said vehicle equipment pattern determination part changed, if the said notification of completion of a change is received. Keyless entry system for vehicles.   The portable device pattern determination unit and the in-vehicle device pattern determination unit are respectively configured to perform the operation in passive communication when an operation of closing the door as a predetermined operation of the vehicle is performed after locking or unlocking the door of the vehicle. The keyless entry system for vehicles according to any one of claims 1 to 5, wherein a signal pattern used for signal generation and reception is changed. The in-vehicle device includes an in-vehicle device notification unit that notifies a warning,
The said vehicle equipment alerting | reporting part alert | reports a warning, when the determination of the said pattern determination part is not materialized, or when collation of the said collation part is not materialized, The warning as described in any one of Claims 1-6 characterized by the above-mentioned. Keyless entry system for vehicles.   8. The vehicle keyless entry system according to claim 7, wherein the in-vehicle device notification unit blinks the hazard lamp or outputs a warning sound to the horn as the warning notification. The vehicle-mounted device transmission unit transmits an alarm signal to the portable device possessed by the user when the determination of the pattern determination unit is not satisfied or when the verification of the verification unit is not satisfied,
The portable device is
The vehicle according to any one of claims 1 to 8, further comprising a portable device notifying unit that notifies a user having the portable device of a warning in response to an alarm signal transmitted from the in-vehicle device. Keyless entry system. The portable device storage unit and the in-vehicle device storage unit store a bit inversion pattern and a bit non-inversion pattern of signals as the plurality of signal patterns,
The portable device pattern determination unit and the in-vehicle device pattern determination unit change a signal pattern used for generation and reception of the operation signal to the bit inversion pattern or the bit non-inversion pattern in the passive communication. The keyless entry system for vehicles according to any one of claims 1 to 9. The portable device storage unit and the in-vehicle device storage unit store a plurality of function codes to be included in the operation signal, and a plurality of function code assignment patterns for locking / unlocking operation instructions as the plurality of signal patterns. ,
The said portable machine pattern determination part and the said vehicle equipment pattern determination part change the allocation pattern used for the production | generation and reception of the said operation signal in the said passive communication, It is any one of Claims 1-10 characterized by the above-mentioned. Keyless entry system for vehicles as described. The portable device storage unit and the in-vehicle device storage unit respectively assigned locking and unlocking operation instructions to the two function codes as the two function codes to be included in the operation signal and the plurality of signal patterns. Storing a first assignment pattern and a second assignment pattern in which the assignment of operation instructions for locking and unlocking is exchanged from the first assignment pattern;
The vehicle keyless entry according to claim 10, wherein the portable device pattern determination unit and the in-vehicle device pattern determination unit switch to the first allocation pattern or the second allocation pattern in the passive communication. system.

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