JP5393718B2 - Electronic key device - Google Patents

Description

  The present invention relates to an electronic key device, and more particularly to a door by collating an ID code of a portable device by communication between a portable device such as an electronic key carried by a user and an in-vehicle device mounted on a vehicle such as an automobile. The present invention relates to an electronic key device for locking and unlocking a trunk or starting an engine.

  Conventionally, when locking and unlocking a door of a vehicle or starting an engine, a user inserts a key into a keyhole and rotates it, so that it is inserted into a user's pocket or bag like a so-called FOB key. Without touching the key at all, wireless communication is performed between the in-vehicle device and the key (portable device), and the in-vehicle device compares the ID code from the portable device with the ID code stored in advance, If they match, the user is authenticated, and after authentication, the user simply touches the sensor attached to the doorknob, and the in-vehicle device locks and unlocks the door, and then presses the button attached to the driver's seat. There is an electronic key device for vehicles that can start the engine just by pressing.

  In addition, a smart keyless entry function and a remote keyless entry function are generally known as electronic key functions.

  The smart keyless entry function means that when a user touches a switch (or sensor) attached to a doorknob, a request signal for collation is transmitted wirelessly from the in-vehicle device, and the registered portable device is connected to the vehicle. When the mobile device is in the vicinity, the mobile device receives the request signal and returns a response signal to the request signal. The in-vehicle device collates the response signal responded by the mobile device and locks and unlocks the door. It is to do.

  On the other hand, with the remote keyless entry function, when the user presses the door lock / unlock button attached to the portable device, the portable device transmits the lock / unlock signal wirelessly, and the in-vehicle device verifies the signal. When it is determined that the signal is from a registered portable device, the door is locked and unlocked. As described above, in the remote keyless entry function, the user can unlock and unlock from a certain distance using a portable device like a remote control operation without touching the door of the vehicle.

  In addition, as a conventional keyless entry system, there exist a thing of patent document 1 and patent document 2, for example.

  The keyless entry system described in Patent Document 1 is transmitted from a portable device to an in-vehicle device in a smart keyless entry operation for the purpose of providing a keyless entry system that improves the use period of the portable device and has a good communication response. By implementing faster communication speed than remote keyless entry operation, shortening the wake time of the portable device and lengthening the preamble of the in-vehicle device, shortening the intermittent time of the portable device and reducing the battery life of the portable device Is to improve.

  The keyless entry system described in Patent Literature 2 switches the communication speed from the portable device for each function in order to realize a safer keyless entry system at a low cost. A filter is provided to identify and limit the distance for each function.

JP 2001-214651 A JP 2009-46930 A

  The keyless entry system described in Patent Document 1 described above improves the battery life of the portable device by shortening the intermittent time of the portable device by shortening the wake time of the portable device and increasing the preamble of the in-vehicle device. Therefore, it is necessary to lengthen the preamble of the in-vehicle device, thereby increasing the communication time, delaying the operation, and intermittent operation of the portable device, so that smart keyless entry is not required However, there is a problem in that power is required for the portable device and battery consumption is accelerated. In addition, the keyless entry system described in Patent Document 1 needs to wait for data of all registered portable devices in response to a question from the in-vehicle device, and when a plurality of portable devices are registered, There was a problem that the operation might be delayed.

  In addition, the keyless entry system described in Patent Document 2 switches the communication speed from the portable device for each function, and the in-vehicle device is provided with a filter corresponding to each function to identify and limit the distance for each function. Therefore, the in-vehicle device needs to prepare a plurality of hardware filters in order to identify each communication speed, and there is a problem that the manufacturing cost is high.

  The present invention has been made to solve such problems. In the smart keyless entry function, the communication speed is high, the responsiveness is improved, the battery life is extended, and in the remote keyless entry function, Since the communication speed is low, the communication distance can be secured, each function can be realized without degrading the performance, and even if the communication speed is changed, the communication speed can be identified by the communication speed of the synchronization signal, so a common filter is used. It is an object of the present invention to obtain an electronic key device that can be used at a low cost and can be manufactured at a low cost.

  The present invention includes an in-vehicle device mounted on a vehicle and a portable device possessed by a user, and the in-vehicle device authenticates the portable device by performing communication between the in-vehicle device and the portable device. In this case, the electronic key device drives a control device mounted on the vehicle, and when the user operates a switch provided on the vehicle, the vehicle-mounted device requests authentication from the portable device. When the user operates a smart keyless entry mode in which an authentication process is started and a switch provided in the portable device is operated, the portable device requests authentication from the in-vehicle device. A remote keyless entry mode in which an authentication process is started when a portable device switch operation signal is transmitted, and the portable device includes a portable device side CPU and a key I which is a unique identification code of the own device. And a portable device side memory for storing a key number which is a reference number of the own device, a portable device side receiving means for receiving a signal from the onboard device, and a portable device side transmitting means for transmitting a signal to the onboard device. And a communication speed of the transmission signal transmitted from the portable device side transmission means, the first communication speed for the smart keyless entry mode, and the second communication for the remote keyless entry mode different from the first communication speed. Communication speed switching means for switching to any one of the communication speeds, and when receiving a request signal from the in-vehicle device by the portable device side receiving means, based on the activation command code included in the request signal, An activation unit that activates the portable device side CPU, and the portable device transmits the transmission signal that is switched by the communication speed switching unit to the in-vehicle device. In order to make the in-vehicle device detect the communication speed, a third communication speed that is lower than the first communication speed in the smart keyless entry mode via the portable device-side transmission means before transmitting the transmission signal. And a synchronization signal transmitting means for transmitting the second synchronization signal at a fourth communication speed lower than the second communication speed in the remote keyless entry mode. Has a single low-pass filter, and receives the signal from the portable device via the low-pass filter, and the vehicle-mounted device-side transmitting means that transmits the signal to the portable device A vehicle ID memory that stores a key ID that is a unique identification code for each portable device registered in the device, and a key number that is a reference number for each portable device registered in the device, and the vehicle device side reception When the first or second synchronization signal is received by the means via the low-pass filter, it is detected whether the communication speed of the received synchronization signal is the third communication speed or the fourth communication speed. Based on the communication speed detection means and the communication speed of the synchronization signal detected by the communication speed detection means, it is determined whether the synchronization signal is in the smart keyless entry mode or the remote keyless entry mode. The reception mode setting means for setting the reception mode of the own device to the determined mode, and when the set reception mode is the smart keyless entry mode, when the user operates a switch provided on the vehicle, The request signal was transmitted to the portable device, and the response was made based on the request response signal returned from the portable device. The band number is identified, an authentication signal including the key number of the portable device is transmitted to the identified portable device, and the key number of the authentication signal and the key number stored in the memory of the identified portable device are When a match is received, an authentication response signal including the key ID of the portable device transmitted from the portable device is received, and the key ID of the authentication response signal matches the key ID stored in the in-vehicle device side memory The portable device switch that is transmitted from the portable device when a user operates a switch provided in the portable device when the authentication is determined to be established and the set reception mode is a remote keyless entry mode. When the operation signal is received, the key ID of the portable device as the transmission source included in the portable device switch operation signal and the key ID stored in the in-vehicle device side memory are An electronic key comprising: an authentication unit that determines that authentication is established when the authentication is successful; and a drive unit that drives the control device mounted on the vehicle when authentication is established by the authentication unit. Device.

  The present invention includes an in-vehicle device mounted on a vehicle and a portable device possessed by a user, and the in-vehicle device authenticates the portable device by performing communication between the in-vehicle device and the portable device. In this case, the electronic key device drives a control device mounted on the vehicle, and when the user operates a switch provided on the vehicle, the vehicle-mounted device requests authentication from the portable device. When the user operates a smart keyless entry mode in which an authentication process is started and a switch provided in the portable device is operated, the portable device requests authentication from the in-vehicle device. A remote keyless entry mode in which an authentication process is started when a portable device switch operation signal is transmitted, and the portable device includes a portable device side CPU and a key I which is a unique identification code of the own device. And a portable device side memory for storing a key number which is a reference number of the own device, a portable device side receiving means for receiving a signal from the onboard device, and a portable device side transmitting means for transmitting a signal to the onboard device. And a communication speed of the transmission signal transmitted from the portable device side transmission means, the first communication speed for the smart keyless entry mode, and the second communication for the remote keyless entry mode different from the first communication speed. Communication speed switching means for switching to any one of the communication speeds, and when receiving a request signal from the in-vehicle device by the portable device side receiving means, based on the activation command code included in the request signal, An activation unit that activates the portable device side CPU, and the portable device transmits the transmission signal that is switched by the communication speed switching unit to the in-vehicle device. In order to make the in-vehicle device detect the communication speed, a third communication speed that is lower than the first communication speed in the smart keyless entry mode via the portable device-side transmission means before transmitting the transmission signal. And a synchronization signal transmitting means for transmitting the second synchronization signal at a fourth communication speed lower than the second communication speed in the remote keyless entry mode. Has a single low-pass filter, and receives the signal from the portable device via the low-pass filter, and the vehicle-mounted device-side transmitting means that transmits the signal to the portable device A vehicle ID memory that stores a key ID that is a unique identification code for each portable device registered in the device, and a key number that is a reference number for each portable device registered in the device, and the vehicle device side reception When the first or second synchronization signal is received by the means via the low-pass filter, it is detected whether the communication speed of the received synchronization signal is the third communication speed or the fourth communication speed. Based on the communication speed detection means and the communication speed of the synchronization signal detected by the communication speed detection means, it is determined whether the synchronization signal is in the smart keyless entry mode or the remote keyless entry mode. The reception mode setting means for setting the reception mode of the own device to the determined mode, and when the set reception mode is the smart keyless entry mode, when the user operates a switch provided on the vehicle, The request signal was transmitted to the portable device, and the response was made based on the request response signal returned from the portable device. The band number is identified, an authentication signal including the key number of the portable device is transmitted to the identified portable device, and the key number of the authentication signal and the key number stored in the memory of the identified portable device are When a match is received, an authentication response signal including the key ID of the portable device transmitted from the portable device is received, and the key ID of the authentication response signal matches the key ID stored in the in-vehicle device side memory The portable device switch that is transmitted from the portable device when a user operates a switch provided in the portable device when the authentication is determined to be established and the set reception mode is a remote keyless entry mode. When the operation signal is received, the key ID of the portable device as the transmission source included in the portable device switch operation signal and the key ID stored in the in-vehicle device side memory are An electronic key comprising: an authentication unit that determines that authentication is established when the authentication is successful; and a drive unit that drives the control device mounted on the vehicle when authentication is established by the authentication unit. Because it is a device, the smart keyless entry function has a high communication speed, improves responsiveness and extends battery life, and the remote keyless entry function has a low communication speed and can secure a communication distance. Each function can be realized without reducing the communication speed, and even if the communication speed is changed, the communication speed can be identified by the communication speed of the synchronization signal, so the filter can be used in common, and the manufacturing cost can be kept low. .

It is a block diagram which shows the whole structure of the electronic key apparatus which concerns on Embodiment 1 and Embodiment 2 of this invention. It is explanatory drawing explaining an example of the transmission signal of the electronic key apparatus which concerns on Embodiment 1 and Embodiment 2 of this invention. It is a time chart explaining the time communication process of the electronic key apparatus which concerns on Embodiment 1 and Embodiment 2 of this invention. It is the flowchart which showed operation | movement of the electronic key apparatus which concerns on Embodiment 1 of this invention. It is the flowchart which showed operation | movement of the electronic key apparatus based on Embodiment 2 of this invention. It is explanatory drawing explaining the synthesis | combination of the received signal in the electronic key apparatus which concerns on Embodiment 2 of this invention.

Embodiment 1 FIG.
An electronic key device according to Embodiment 1 of the present invention will be described. FIG. 1 is a conceptual diagram of this apparatus, in which 10 is an in-vehicle device mounted in a predetermined place of the vehicle, and 101 and 102 are portable devices A and B carried by the user. The electronic key device according to the first embodiment includes an in-vehicle device 10 and portable devices 101 and 102, and the in-vehicle device 10 is portable by performing communication between the in-vehicle device 10 and the portable devices 101 and 102. When the devices 101 and 102 are authenticated, the control device mounted on the vehicle is driven. In the present embodiment, the electronic key device will be described as having two functions: a smart keyless entry function (mode) and a remote keyless entry function (mode).

In the smart keyless entry function, when a user operates a switch provided on the vehicle, a request signal for requesting authentication is transmitted from the in-vehicle device 10 to the portable devices 101 and 102, and the authentication processing starts. Is done.
On the other hand, in the remote keyless entry function, when a user operates a switch provided on the portable devices 101 and 102, a portable device switch operation signal for requesting authentication from the portable device 101 or 102 to the in-vehicle device 10 is received. Then, the authentication process is started.
Details of these operations will be described later.

  First, the in-vehicle device 10 will be described. The in-vehicle device 10 includes a first transmission unit 11, a first CPU 12, a driving unit 15, and a first memory 16 inside. The first CPU 12 is provided with communication speed detecting means 13 for detecting the communication speed of the received signal. In FIG. 1, the first CPU 12 is illustrated as including the reception signal synthesis unit 14, but the reception signal synthesis unit 14 is a configuration necessary for the second embodiment to be described later. In the present embodiment, it is not necessary to provide it. The first memory 16 also has a Wake Up ID 17 as a start instruction code, a unique key number 18A, 18B (reference number) for each portable device 101, 102, and a unique number for each portable device 101, 102. Key IDs 19A and 19B (unique identification codes) are stored.

  Reference numeral 20 denotes a transmission antenna provided in the in-vehicle device 10, which is connected to the first transmission unit 11 and transmits a transmission signal directed to the portable devices 101 and 102. 21 is a vehicle control device. Reference numeral 22 denotes a request switch provided in the vehicle for touching with a hand when the user performs door locking / unlocking or engine starting, for example. In FIG. 1, only one request switch 22 is shown, but actually, a plurality of individual switches are provided, such as a door knob for locking and unlocking a door and a vicinity of a handle for starting an engine. Is. Reference numeral 30 denotes a receiver provided with an LPF 32 (LPF: Low-Pass Filter) provided in the in-vehicle device 10. A receiving antenna 31 is provided in the receiver 30 for receiving signals from the portable devices 101 and 102.

  Next, the portable devices 101 and 102 will be described. Since the portable devices 101 and 102 have the same configuration, only the portable device 101 will be described here. For the portable device 102, the description is referred to. The portable device 101 includes a second transmission unit 110 having a transmission antenna 118, a reception IC 111 (IC: Integrated Circuit) having a reception antenna 119, a second CPU 115, a battery 116, and a function switch 117. And. Examples of the function switch 117 include a door locking / unlocking switch. In the following description, the door locking / unlocking switch 117 will be described based on this example.

  The second CPU 115 is provided with a communication speed switching unit 112, a second memory 113, and a reception unit 114 that receives a communication signal via the reception IC 111. The second memory 113 stores a key number unique to the portable device 101 and a key ID of the portable device 101. The communication speed switching unit 112 switches the communication speed in accordance with the smart keyless entry function and the remote keyless entry function and in accordance with the synchronization signal and the subsequent transmission signal.

  The operation of the electronic key device according to the first embodiment will be described below with reference to FIG. 1, FIG. 2, FIG. 3, and FIG.

  FIG. 2 shows an example of the request signal 200 and the authentication signal 201 transmitted from the in-vehicle device 10 according to the first embodiment, the request response signal 300 and the authentication response signal 301 transmitted from the portable devices 101 and 102, and the portable device. 5 is a diagram illustrating an example of a button operation signal 302. FIG. As shown in FIG. 2, the request signal 200 from the in-vehicle device 10 includes a Wake Up ID as an activation instruction code for activating the CPU, a response request code indicating that the signal is a request signal, Challenge data newly generated from random numbers each time authentication is performed for use in machine authentication, and a CRC check code for determining whether the signal is normal are included. The authentication signal 201 from the in-vehicle device 10 includes a Wake Up ID as an activation instruction code, an authentication request key number that is a key number of a portable device that requests authentication, challenge data for use in authentication, a CRC check code, It is included. Further, the request response signal 300 (300A and 300B in FIG. 3) from the portable devices 101 and 102 includes a first synchronization signal and response data. The request response signal 300 is transmitted as a reply signal to the request signal 200, and the contents of the response data are the same as the contents of the challenge data included in the request signal in order to make the correspondence relationship easy to understand. Good. Further, the authentication response signal 301 from the portable devices 101 and 102 includes a first synchronization signal, a key ID of the portable device, response data, and a CRC check code. The authentication response signal 301 is transmitted as a reply signal to the authentication signal 201. In order to make the correspondence relationship easy to understand, the content of the response data is the same as the content of the challenge data included in the authentication signal. Good. Further, the portable device SW operation signal 302 from the portable devices 101 and 102 includes a second synchronization signal, SW information of a door lock / unlock switch 117 provided in the portable device, a key ID of the own device, A rolling code for counting the number of operations every time the door lock / unlock switch 117 is operated, and a CRC check code for determining whether or not the signal is normal are included.

  Of the signals shown in FIG. 2, signals transmitted by the smart keyless entry function are a request signal 200 and an authentication signal 201 from the in-vehicle device 10, a request response signal 300 from the portable devices 101 and 102, and an authentication response signal. 301. A signal transmitted by the remote keyless entry function is a portable device switch operation signal 302 from the portable devices 101 and 102.

  The communication speeds of the request signal 200 and the authentication signal 201 from the in-vehicle device 10 are both 3.9 kbps, for example. The communication speed of the first synchronization signal in the request response signal 300 from the portable devices 101 and 102 and the first synchronization signal in the authentication response signal 301 is, for example, 1.6 kbps. Signals other than the first synchronization signal (response data) in the request response signal 300 from the portable devices 101 and 102 and signals other than the first synchronization signal in the authentication response signal 301 (key ID, response data, CRC) The communication speed of the check code is, for example, 8 kbps. This is called the first communication speed. The communication speed of the second synchronization signal of the portable device switch operation signal 302 from the portable devices 101 and 102 is, for example, 1.3 kbps, and signals other than the second synchronization signal (switch information, key ID, rolling Code, CRC check code) is, for example, 4 kbps. This is called the second communication speed. Note that the first communication speed and the second communication speed are different from each other, and it is desirable that the first communication speed is faster than the second communication speed. In addition, the communication speed of the first synchronization signal and the communication speed of the second synchronization signal are different from each other, and the communication speed of the first synchronization signal is faster than the communication speed of the second synchronization signal. desirable. Further, it is desirable that the communication speed of the first and second synchronization signals is slower than the first and second communication speeds. To summarize the relationship between these four communication speeds, the communication speed of the second synchronization signal (1.3 kbps) is the slowest, and the next slowest is the communication speed of the first synchronization signal (1.6 kbps). Next, it is most desirable to set the respective communication speeds such that the second communication speed (4 kbps) and the first communication speed (8 kbps) are the fastest.

FIG. 3 is a time chart showing temporal communication processing of transmission signals of the in-vehicle device 10 and the portable devices 101 and 102 in the first embodiment. As shown in FIG. 3, in the smart keyless entry operation, when the in-vehicle device 10 transmits the request signal 200, the portable devices 101 and 102 transmit the request response signals 300A and 300B accordingly. The request response signals 300A and 300B are transmitted with delay times (Delay times) 500A and 500B corresponding to the TM numbers stored in the second memory 114 so as not to collide with each other. Next, when the in-vehicle device 10 transmits the authentication signal 201, the portable devices 101 and 102 transmit the authentication response signal 301 accordingly.
On the other hand, in the remote keyless entry operation, the portable device SW operation signal is transmitted from the portable devices 101 and 102 to the vehicle-mounted device 10 when the door lock / unlock switch 117 of the portable devices 101 and 102 is operated. Is done.

  FIG. 4 is a flowchart showing the operation of the electronic key device according to the first embodiment. Below, operation | movement is demonstrated using FIGS. 1-4. The electronic key device according to the first embodiment has a smart keyless entry function and a remote keyless entry function, and will be described separately for both functions. In addition, in the following description, although operation | movement with the portable device 101 and the vehicle equipment 10 is demonstrated, since the operation | movement with the portable device 102 and the vehicle equipment 10 is also the same, refer to the following description for it. And

  First, the case of the smart keyless entry function of the electronic key device according to the first embodiment will be described. In this case, first, when the user gets into the vehicle, the user carries the portable device 101 and presses the request switch 22 such as a touch sensor attached near the door knob of the vehicle. At this time, the portable device carried by the user may be any of the portable devices 101 and 102, in short, may be one of one or more portable devices registered in advance in the in-vehicle device 10. The first CPU 12 is activated by the push button of the request switch, and the transmission means 11 uses an activation instruction code to confirm whether the user has one of the portable devices registered in the in-vehicle device 10. A request signal 200 including a certain Wake Up ID 17 and a response request code is transmitted wirelessly at a level reaching a range near the vehicle, for example, 125 kHz as a carrier frequency. Then, the reception IC 111 of the registered portable device 101 receives the request signal 200 by the reception antenna 119, and the activation is performed when the Wake Up ID 17 included in the request signal 200 matches the Wake Up ID 121 of the reception IC 111. The second CPU 115 is activated by the means 120.

  The second CPU 115 determines the reliability of the signal based on, for example, a CRC check code included in the transmitted request signal 200. If the second CPU 115 determines that the signal is a normal signal, the second CPU 115 transmits response signals 300A, In order to prevent 300B from colliding with each other, delay times 500A and 500B corresponding to the TM numbers stored in the second memory 113 are provided, for example, 315 MHz is used as a carrier frequency, and the communication speed switching means 112 is used for smart. In the keyless entry function, the communication speed for the synchronization signal, for example, 1.6 kbps is set, and the transmission means 110 transmits the synchronization signal portion of the request response signal 300A. Next, in the smart keyless entry function, the communication speed is set to a first communication speed for a transmission signal transmitted subsequent to the synchronization signal other than the synchronization signal, for example, 8 kbps. The part other than the synchronization signal of the request response signal 300A is transmitted. What is necessary is just to set the frequency and communication speed used for communication according to the function and environment to be used. The first communication speed (8 kbps) in the smart keyless entry function is different from the second communication speed in the remote keyless entry function.

  Based on the request response signal 300A transmitted from the portable device 101, the in-vehicle device 10 identifies from which delay time 500A the request response signal 300A is from which portable device the signal is the response. The key number of the portable device is confirmed with reference to the relationship between the delay time stored in the memory 16 and the key number. For example, the relationship may be stored in association with a table or the like. Since the portable device specified in this case is the portable device 101, the in-vehicle device 10 transmits an authentication signal 201 including the key number to the portable device 101. The portable device 101 receives the authentication signal 201, collates the key number included in the authentication signal 201 with the key number of the own device stored in the second memory 113, and if they match, the key of the own device An authentication response signal 301 including the ID is transmitted. The in-vehicle device 10 receives the authentication response signal 301, compares the key ID of the authentication response signal with the key ID in the first memory 16, and determines that the authentication is successful if there is a match.

  The in-vehicle device 10 includes a receiver 30 equipped with an LPF 32 having a wide pass band so that signals of both the first communication speed and the second communication speed transmitted from the registered portable device 101 can be received. At this time, a signal is constantly received, and a synchronization signal that can determine the communication speed transmitted before the transmission signal is detected. This synchronization signal enables detection of the head of the signal even when the transmission signal is received from the middle, and at the same time, because the frequency band of the LPF 32 is set wide due to the use of a plurality of communication speeds, Is set to a communication speed slower than the transmission speed of the transmission signal. In addition, since the communication speed of the transmission signal is switched to a different communication speed by the communication speed switching means 112, the communication of the synchronization signal is performed for each of the first and second communication speeds so that the determination can be made according to each communication speed. Switch speed. For example, in the remote keyless entry function, since the transmission speed of the transmission signal is the second communication speed (4 kbps), the communication speed of the synchronization signal is lower than that, for example, 1.3 kbps, whereas in the smart keyless entry function, Since the communication speed of the transmission signal is the first communication speed (8 kbps), the communication speed of the synchronization signal is set to be slower than that, for example, 1.6 kbps. Therefore, if the communication speed of the synchronization signal is detected, it can be determined whether the function is the smart keyless entry function or the remote keyless entry function.

  As shown in FIG. 4, the in-vehicle device 10 first starts signal reception at the receiver 30 via the reception antenna 31 and the LPF 32 in step S1, and determines the communication speed of the received signal as communication speed detection means. 13, if it is detected that a 1.3 kbps or 1.6 kbps signal has been received, it is a synchronization signal, so the first CPU 12 determines that it is based on the communication speed of the received signal. It is determined whether the signal is based on the remote keyless entry function, the smart keyless entry function, or otherwise. That is, when the communication speed of the received signal is 1.3 kbps, since it is a synchronization signal of the remote keyless entry function, the signal reception mode is set to the remote keyless entry reception mode of the second communication speed (step S2). When the communication speed of the received signal is 1.6 kbps, since it is a synchronization signal of the smart keyless entry function, the signal reception mode is set to the first key communication speed of the keyless entry reception mode (step S3). .

  In this way, when the received signal is a synchronization signal, the in-vehicle device 10 determines whether the smart keyless entry reception mode or the remote keyless entry reception mode according to the first or second communication speed according to the communication speed of the synchronization signal. In this state, a signal transmitted subsequent to the synchronization signal is received. On the other hand, when the received signal is a transmission signal other than the synchronization signal, the communication speed is neither 1.3 kbps nor 1.6 kbps, so the determination in step S1 is “other” (NG). Proceed to S4. Note that the other (NG) in the determination in step S1 is usually the case of a transmission signal transmitted following the synchronization signal. Therefore, when a signal transmitted following the synchronization signal is received, it is a transmission signal that starts with the signal, so reception starts with the signal as the head. Specifically, as the reception process, first, in step S4, it is determined whether the currently set reception mode is the remote keyless entry reception mode or the smoke keyless entry reception mode.

  In the smart keyless entry reception mode, the process proceeds to step S8, where it is determined whether or not the communication speed of the received signal is an 8 kbps signal. If it is determined that the signal is an 8 kbps signal, in step S9, Receive. Note that this case corresponds to the case where the received signal is the request response signal 300 or the authentication response signal 301.

  On the other hand, if it cannot be determined that the signal is 8 kbps in step S8, the current reception mode is canceled in step S10, the reception is terminated, the process returns to step S1, and signal reception is resumed. It is determined whether or not a synchronization signal is received.

  In the case of the remote keyless entry reception mode, the process proceeds to step S5, where it is determined whether or not the communication speed of the received signal is a signal of 4 kbps. Receive the signal. Note that this case corresponds to the case where the received signal is the portable device switch operation signal 302.

  On the other hand, if it cannot be determined that the signal is 4 kbps in step S5, the current reception mode is canceled in step S7, the reception ends, the process returns to step S1, and signal reception is resumed. It is determined whether or not a synchronization signal is received.

  As described above, in the smart keyless entry function, first, when the user touches the request switch 22 attached to the door knob when getting into the vehicle, a request for verification from the in-vehicle device 10 is made. When the signal 200 is transmitted wirelessly and the portable device 101 registered in advance in the vehicle-mounted device 10 is in the vicinity of the vehicle, that is, when the user has the portable device 101, the portable device 101 When receiving the signal and returning a request response signal 300A for the signal, the in-vehicle device 10 verifies the request response signal 300A to which the portable device 101 responds, and authenticates that the signal is from the portable device 101. Lock and unlock the door.

  Therefore, when the user touches the request switch 22, the in-vehicle device 10 first transmits the request signal 200 wirelessly by the transmission unit 11. The configuration of the request signal 200 is as shown in FIG. 2, and a Wake Up ID that is an activation instruction code for the CPU, a response request code indicating that it is a request signal, and a random number for authenticating the portable device 101 And a CRC check code for judging signal reliability.

  When the portable device 101 owned by the user receives the request signal 200, the portable device 101 wirelessly transmits a request response signal 300A. Since the configuration of the request response signal 300A is the configuration of the request response signal 300 shown in FIG. 2, first, a synchronization signal (first synchronization signal) transmitted first and a transmission signal (response data transmitted subsequently) are transmitted. ). This response data has the same content as the challenge data of the request signal 200. First, the in-vehicle device 10 receives the first synchronization signal (1.6 kbps) transmitted first in the configuration of the request response signal 300A. If the communication speed detection means 13 determines in step S1 that the communication speed of the first synchronization signal is 1.6 kbps, the smart keyless entry reception mode is set in step S3. Based on the transmission time of the transmitted request signal 200, it is determined from the delay times 500A and 500B of the received signal which key number of the portable device has responded, and authentication is performed on the responding portable device. In this example, the delay time is 500 A, and the responding portable device is authenticated as the portable device 101 registered in the in-vehicle device 10.

  Next, a signal of the first communication speed (response data of the request response signal) transmitted following the first synchronization signal is received, and in step S4, the current reception mode is the smart keyless entry reception mode. In step S8, it is determined whether or not the signal is an 8 kbps signal. If it is determined that the signal is an 8 kbps signal, smart keyless entry reception processing is performed in step S9. If it is determined in step S8 that the signal is not an 8 kbps signal, the reception mode is canceled in step S10 to terminate the reception, and the process returns to step S1 again to determine whether or not the synchronization signal is received. After the reception is completed, it is determined whether or not the signal is normal based on the CRC check code. In addition, although the example of specifying the portable device using the above delay time has been described with reference to the delay time of the synchronization signal, it may be specified by the delay time of the response data that follows.

  Next, the in-vehicle device 20 transmits an authentication signal 201 to the authenticated portable device 101. As with the transmission of the request signal 200, the authentication signal includes a Wake Up ID for starting the CPU, an authentication request code indicating that the signal is an authentication signal, a key number of the portable device 101 that requests authentication, a portable device It includes challenge data composed of random numbers for authenticating 101, and a CRC check code for judging signal reliability. The authentication signal 201 is transmitted at the same frequency and communication speed as the request signal 200.

  When the portable device 101 first confirms the reliability of the signal with the CRC check code with respect to the authentication signal 201 transmitted from the in-vehicle device 10, and determines that the signal is correct as a result of the confirmation, Is determined from the key number included in the authentication signal as to whether or not the mobile device is requested to be authenticated by the authentication signal. That is, the second CPU determines whether or not the key number of the authentication signal matches the key number of the own device. If they match, the authentication response signal 301 is transmitted. The authentication response signal 301 is transmitted at the same communication frequency and communication speed as the request response signal 300 transmitted in response to the request signal. The authentication response signal 301 includes a key ID set for each portable device, response data having the same data content as the challenge data of the authentication signal 201 received from the in-vehicle device 10, and a CRC check code.

  When the in-vehicle device 10 receives the authentication response signal 301 and the communication speed detection unit 13 determines in step S1 that the communication speed of the synchronization signal of the authentication response signal 301 is the communication speed of the synchronization signal of the smart keyless entry function. After receiving the subsequent signal as data of the first communication speed, the CRC check code determines whether the signal is normal. If it is determined that the signal is normal, then the authentication response It is determined whether or not the response data included in the signal 301 matches the challenge data of the authentication signal 201 transmitted earlier by itself, and the key ID of the portable device included in the authentication response signal 301 and the self-authentication A determination is made as to whether or not the requested key ID of the portable device matches, and if they match, it is determined that authentication has been established. When the authentication is thus established, the driving unit 15 drives the control device 21 under the control of the first CPU 12. Specifically, for example, the first CPU 12 unlocks the door which is one of the control devices 21 by the driving unit 15.

  The portable device 101 uses the receiving IC 111 equipped with the activation means 120, so that periodic intermittent driving is not necessary. Therefore, the second CPU 115 can be activated only when necessary, and is synchronized by intermittent driving. It is not necessary to transmit a long signal for taking a picture, and it is possible to extend the battery life by shortening the transmission signal, suppressing power consumption of the vehicle and battery consumption of the portable device.

  Further, as a first step of the authentication process, after confirming the response of the portable device existing around the vehicle in a short time using the request signal 200, the authentication signal 201 is authenticated only for the portable device. Since it is not necessary to wait until there is a response from all portable devices, the authentication time can be shortened and the responsiveness of the function can be improved.

  Next, the case of the remote keyless entry function will be described. In the remote keyless entry function, when the user first enters the vehicle, the user has the portable device 101 (or any one of 102) registered in the vehicle and is installed in the portable device from a distance or near the vehicle. For example, the door lock / unlock switch 117 is operated. As a matter of course, the distance between the vehicle and the portable device at this time is within a preset communicable distance range. In response to the operation of the door locking / unlocking switch 117 by the user, the portable device 101 transmits an operating device SW operation signal 302. The configuration of the operating device SW operation signal 302 is as shown in FIG. 2, the second synchronization signal (1.3 kbps), the information of the door locking / unlocking switch 117, the key ID set for each portable device, and the unlocking For example, a rolling code and a CRC check code for counting the number of operations every time the switch 117 is operated are portable devices at the transmission means 110 at a second communication speed of 4 kbps, for example, 4 kbps, which is different from the smart keyless entry function with a carrier frequency of 315 MHz, for example. The SW operation signal 302 is transmitted.

  The in-vehicle device 10 determines that the subsequent transmission signal is the second communication speed (4 kbps) of the remote keyless entry function from the communication speed (1.3 kbps) of the second synchronization signal in step S1 of FIG. In step S2, the remote keyless entry reception mode is set. Next, the second communication speed signal transmitted following the second synchronization signal is received. In step S4, it is determined that the current reception mode is the remote keyless entry reception mode, and step S5 is performed. In step S6, it is determined whether the signal is a 4 kbps signal. If the signal is determined to be a 4 kbps signal, remote keyless entry reception processing is performed in step S6. If it is determined in step S5 that the signal is not 4 kbps, in step S7, the reception mode is canceled to terminate the reception, and the process returns to step S1 again to determine whether the synchronization signal is received. After completion of reception, it is determined whether or not the signal is normal by the CRC check code. When it is determined that the signal is normal, the key ID included in the portable device SW operation signal 400 is registered in the in-vehicle device 10. It is determined whether or not the key ID of the portable device matches, and the number of operations of the door lock / unlock switch 117 is specified from the value of the rolling code included in the portable device SW operation signal 400 when the key ID matches. When the value is within the allowable range, the first CPU 12 unlocks the door, which is one of the control devices 21, by the driving means 15.

  Thus, since the signal of the remote keyless entry function can be determined by the speed of the synchronization signal before receiving the signal, it can be separated from the signal by the smart keyless entry function having a different communication speed. Even if a signal by the remote keyless entry function is received at the same timing with respect to the signal, the signal can be identified, so that a remote keyless entry operation by a user operation is possible.

  Since the remote keyless entry function is set to a slow communication speed, communication performance in remote operation from the vehicle can be secured. On the other hand, the smart keyless entry function only operates near the vehicle, so the communication speed is low. The speed and the responsiveness are improved, and it is possible to achieve both performances with these two different functions.

  In this embodiment, in order to perform signal synchronization, a synchronization signal having a communication speed different from that of the communication signal is used, so that continuous data having the same communication speed is transmitted before the signal than the conventional preamble method. It is possible to reliably detect the start of the signal (the head of the signal).

  Also, even if the communication speed is changed, it can be configured with one LPF 32, and by setting the synchronization signal to a slower communication speed different from the transmission signal, it is more reliable than transmitting with the same preamble method. Since the head of the communication signal can be detected and there is no need to set an LPF for each of the two communication speeds, it can be configured at low cost.

  As described above, according to the present embodiment, since the smart keyless entry function has a high communication speed, the responsiveness is improved and the battery life is extended. On the other hand, in the remote keyless entry function, Because the communication speed is reduced, the communication distance can be secured, and the respective functions can be realized without degrading the performance. Even if the communication speed is changed between the functions, the communication speed is the communication of the synchronization signal. Since identification is possible by speed, the LPF can be used in common, and the effect that it can be realized at low cost is obtained.

Embodiment 2. FIG.
Next, a received signal determination method of the electronic key device according to the second embodiment of the present invention will be described with reference to FIGS. Since the basic configuration is the same as that of the first embodiment, the description thereof is omitted here with reference to FIGS.

  In the first embodiment described above, in FIG. 4, when it is determined that the signal is not a communication signal in step S5 or step S8 due to noise mixing, the reception mode is canceled in step S7 or step S10, and the signal is Cannot be received normally. Therefore, in the present embodiment, even if the in-vehicle device 10 cannot normally receive the communication signal at the first or second communication speed, it is equal to or higher than the communication speed detected based on the first or second synchronization signal. When a high-speed signal is detected, the reception signal combining unit 14 for combining with the next signal is included, and authentication processing is performed using the combined signal, so that even a minute noise is generated in the communication signal. An embodiment that enables normal reception will be described.

  FIG. 5 is a flowchart showing the operation of the electronic key device according to the present embodiment. Similarly to the first embodiment, the electronic key device according to the second embodiment also has a smart keyless entry function and a remote keyless entry function. However, FIG. 5 shows only the case of the smart keyless entry function for simplification of the drawing. Since the remote keyless entry function is the same as that of the smart keyless entry function, the description thereof is referred to. Also, in the present embodiment, since both the remote keyless entry function and the smart keyless entry function are provided, it goes without saying that the same processing as step S1 and step S4 shown in FIG. 4 is actually performed. . Moreover, in the following description, although operation | movement with the portable device 101 and the vehicle equipment 10 is demonstrated, since the operation | movement with the portable device 102 and the vehicle equipment 10 is also the same, please refer to the following description for it. And

  As shown in FIG. 5, in step S11, the communication speed of the received signal is detected, and based on the communication speed, synchronization signal determination is performed to determine whether or not the received signal is a synchronization signal. Here, since the case of the smart keyless entry function is shown, that is, if the communication speed of the received signal is 1.6 kbps, it is determined that it is a synchronization signal. If the synchronization signal has been received, the reception mode is set in step S12. That is, the smart keyless entry reception mode is set.

  If the determination in step S11 is NG, that is, if the received signal is a signal other than the synchronization signal, the process proceeds to step S13, and whether the currently set reception mode is the smart keyless entry reception mode. Check the reception mode to confirm If it is determined in step S13 that the smart keyless entry reception mode is not set, the received signal is noise and the process is terminated.

  If it is determined in step S13 that the currently set reception mode is the smart keyless entry reception mode, it is determined in step S14 whether or not signal synthesis is necessary. Since it is not necessary to synthesize the first received signal after receiving the synchronization signal, the process proceeds to step S16. In step S16, whether or not the communication speed of the received signal is the communication speed (8 kbps) in the currently set smart keyless entry reception mode, and if not, whether it is faster or slower A reception determination is performed to determine the above. As a result of the reception determination, if it is determined that the communication speed of the currently received signal is 8 kbps, it is not necessary to synthesize the signal received after the signal in step S17. If the signal is synthesized in step S15, the synthesized signal is cleared.

  On the other hand, if it is determined in step S16 that a signal faster than the set reception mode of 8 kbps has been received, it is assumed that noise has occurred in the received signal 600 as shown in FIG. Then, at the previous reception, it is determined whether or not the signals are combined. If the previous signal is not synthesized, in step S19, the received signal 600 is temporarily stored in the first memory 16 in order to be synthesized with the next received signal. On the other hand, if the previous synthesis has been completed in step S18, the synthesis signal generated in step S15 is cleared and the reception mode is canceled in step S20. Note that the reason for clearing the synthesized signal in step S20 is that if the signal synthesis is repeated, the noise included in the signal is continuously synthesized, and the disturbance noise generated thereby is erroneously determined as a normal signal. Because there is a risk of doing. Therefore, in order to prevent such a situation, the synthesis is not performed again. In the description here, it is described that the next synthesis is not performed twice in succession, but it is also possible to set the number of corrections according to the situation and select an optimal synthesis method.

  If it is determined in step S16 that a signal slower than 8 kbps in the set reception mode has been received, there is no possibility of normal reception even if the signal is synthesized again in step S15 at the next reception. In step S21, the composite signal generated in step S15 is cleared and the reception mode is canceled.

  If it is determined in step S14 that signal synthesis is necessary, if the previous signal is temporarily stored in the first memory 16 in step S19, the stored signal And the signal received this time are combined in step S15 to generate a combined signal 601 shown in FIG. In the synthesized signal 601, it can be seen that the noise is canceled and eliminated. As a synthesis method, an existing synthesis method may be used, and any method may be used as long as noise is reduced or eliminated thereby. Next, the composite signal 601 generated in this way is determined to be received in step S16, and if it is determined to be normal, it can be normally received after the next time, so there is no need to synthesize a signal at the next signal reception. In step S17, the signal is received and the combined signal 601 is cleared.

  FIG. 5 illustrates the signal synthesis at any communication speed, but by changing the number of corrections according to each communication speed, the probability that a signal that cannot be received due to noise can be received can be increased. Can be raised.

  Even if excessive noise is generated by this procedure, by synthesizing and correcting the received signal, the signal that could not be received normally may be received normally. Therefore, according to the present embodiment, control that has been impossible with the communication can be controlled with the communication, so that the response is also improved.

  Note that even if the combined result is erroneously determined, there is no problem because the CRC check finally functions and no malfunction occurs.

  As described above, according to the present embodiment, the same effects as those of the above-described first embodiment can be obtained. Further, in the present embodiment, the in-vehicle device 10 is provided with the reception signal synthesizing unit 14, For signals that have not been normally received because the communication speed of the received signal is faster than the communication speed of the set reception mode, the current signal is temporarily stored in the first memory 16. Since the next received signal and the stored signal are synthesized, even if a minute noise occurs in the communication signal, normal reception is possible, the reliability of the received signal is improved, and communication is impossible. Since it is also possible to control the control that has been necessary, the effect of improving the responsiveness is obtained.

  The electronic key device of the present invention can be applied not only to vehicles such as automobiles but also to all other vehicles such as motorcycles, ships, and aircrafts.

  DESCRIPTION OF SYMBOLS 10 Onboard machine, 11 1st transmission means, 12 1st CPU, 13 Communication speed detection means, 14 Received signal synthesis means, 15 Drive means, 16 1st memory, 17 Wake Up ID, 18 Key number, 19 keys ID, 20 transmitting antenna, 21 control device, 22 request switch, 30 receiver, 31 receiving antenna, 32 LPF, 101,102 portable device, 110 second transmitting means, 111 receiving IC, 112 communication speed switching means, 113 first 2 memories, 114 receiving means, 115 second CPU, 116 battery, 117 function switch (door unlock switch).

Claims (2)

When the in-vehicle device authenticates the portable device by providing the in-vehicle device mounted on the vehicle and the portable device possessed by the user, and performing communication between the in-vehicle device and the portable device, An electronic key device for driving a control device mounted on a vehicle,
When a user operates a switch provided in the vehicle, a request signal for requesting authentication is transmitted from the in-vehicle device to the portable device, and an authentication process is started, and a smart keyless entry mode is started.
Remote keyless entry in which authentication processing is started by transmitting a portable device switch operation signal for requesting authentication from the portable device to the in-vehicle device when a user operates a switch provided in the portable device Mode and
The portable device is
A portable CPU,
A portable device memory that stores a key ID that is a unique identification code of the device and a key number that is a reference number of the device;
Portable device side receiving means for receiving a signal from the in-vehicle device;
Portable device side transmission means for transmitting a signal to the in-vehicle device;
The communication speed of the transmission signal transmitted from the portable device side transmission means is set to a first communication speed for the smart keyless entry mode and a second communication speed for the remote keyless entry mode different from the first communication speed. Communication speed switching means for switching to any one of the communication speeds,
An activation means for activating the portable device side CPU based on an activation instruction code included in the request signal when the request signal from the in-vehicle device is received by the portable device side receiving means;
The portable device transmits to the vehicle-mounted device before the transmission of the transmission signal, so that the vehicle-mounted device detects the communication speed of the transmission signal switched by the communication speed switching means. The first synchronization signal is transmitted at a third communication speed slower than the first communication speed in the smart keyless entry mode, and slower than the second communication speed in the remote keyless entry mode. Synchronization signal transmitting means for transmitting the second synchronization signal at a fourth communication speed,
The in-vehicle device is
A vehicle-mounted device-side receiving means that has a single low-pass filter and receives a signal from the portable device via the low-pass filter;
On-vehicle device side transmission means for transmitting a signal to the portable device;
An in-vehicle device side memory storing a key ID that is a unique identification code for each portable device registered in the own device, and a key number that is a reference number for each portable device registered in the own device;
When the on-vehicle device side receiving means receives the first or second synchronization signal via the low-pass filter, the communication speed of the received synchronization signal is the third communication speed or the fourth communication. A communication speed detecting means for detecting the speed,
Based on the communication speed of the synchronization signal detected by the communication speed detection means, it is determined whether the synchronization signal is a smart keyless entry mode or a remote keyless entry mode. A reception mode setting means for setting the reception mode of the own device;
When the set reception mode is the smart keyless entry mode, when a user operates a switch provided in the vehicle, the request signal is transmitted to the portable device, and a response is sent from the portable device to the portable device. Based on the received request response signal, the responding portable device is identified, an authentication signal including the key number of the portable device is transmitted to the identified portable device, and the key number of the authentication signal is identified. When the key number stored in the memory of the portable device matches, the authentication response signal including the key ID of the portable device transmitted from the portable device is received, and the key ID of the authentication response signal and the in-vehicle device When the key ID stored in the side memory matches, it is determined that authentication has been established,
In the remote keyless entry mode, the set reception mode is when the portable device switch operation signal transmitted from the portable device is received when a user operates a switch provided in the portable device, Authentication means for determining that authentication is established when a key ID of the portable device included in the portable device switch operation signal matches a key ID stored in the in-vehicle device side memory;
An electronic key device comprising: drive means for driving the control device mounted on the vehicle when authentication is established by the authentication means. When the vehicle-mounted device cannot normally receive a transmission signal at the first or second communication speed and receives a signal with a communication speed faster than the first or second communication speed, A reception signal combining means for combining the signal and the next signal;
The electronic key device according to claim 1, wherein the authentication unit performs the authentication using a synthesized signal generated by the received signal synthesizing unit.

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