JP2011021369A - Electronic key system for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic key system for a vehicle, which can analyze radio signals transmitted and received between a vehicle onboard unit and a portable machine even in the case where spread spectrum communication is adopted as a wireless communication method. <P>SOLUTION: In the electronic key system of a vehicle, the execution of various vehicle controls by the vehicle onboard unit 10 is permitted by transmitting and receiving request signals Sr and response signals Sa between the vehicle onboard unit 10 and the portable machine 20. When the vehicle onboard unit 10 and the portable machine 20 transmits and receives the response signals Sa, the response signals Sa are FSK-modulated and the FSK-modulated response signals Sa are spread-modulated, and the modulated response signals Sa are transmitted and received by the vehicle onboard unit 10 and the portable machine 20. A transmission mode of a transmitting set 22 is switched from a transmission mode of transmitting the spread-modulated response signals Sa to a transmission mode of transmitting the FSK-modulated response signals Sa based on the reception of a communication mode switching signal, transmitted from an inspection machine, by the portable machine 20. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electronic key system for a vehicle that performs vehicle control through wireless communication between an in-vehicle device and a portable device, and more particularly to an electronic key system for a vehicle that employs a spread spectrum communication method as a wireless communication method.

  When a user holding a portable device (electronic key) approaches the vehicle door, the vehicle door is unlocked, and when the user enters the vehicle compartment, engine start permission is executed. Electronic key systems are well known. Conventionally, as such an electronic key system, for example, a system described in Patent Document 1 is known. FIG. 6 shows an outline of an electronic key system that is generally employed in the past, including the system described in Patent Document 1.

  As shown in FIG. 6, in this electronic key system, the user who possesses the portable device 20 is an area indicated by a two-dot chain line in the figure, that is, an out-of-vehicle communication area A1 set around the vehicle door, or the interior of the vehicle Wireless communication is performed between the in-vehicle device 10 and the portable device 20 mounted on the vehicle. Then, through this wireless communication, the authentication codes set in the in-vehicle device 10 and the portable device 20 are collated, and when it is determined that the mutual authentication codes match through the collation, the vehicle door is unlocked. And various vehicle controls such as engine start permission are executed. According to such an electronic key system, various operations of the vehicle are automatically performed without direct manual operation by the user, so that the convenience of the vehicle operation is greatly improved.

  On the other hand, regarding such an electronic key system for a vehicle, in recent years, as described in Patent Document 2, for example, in order to ensure good wireless communication between an in-vehicle device and a portable device in an environment that is susceptible to noise, It has been proposed to adopt a spread spectrum communication system as a wireless communication system. Incidentally, the spread spectrum communication is a communication method in which communication processes shown in the following (a1) and (a2) are performed on the transmission side and the reception side, respectively.

  (A1) On the transmission side, after modulating a radio signal including information to be transmitted into a narrowband signal, the narrowband signal is spread-modulated based on a predetermined spreading code, and the modulated signal (spread modulation signal) Is sent to the receiver.

(A2) On the receiving side, the received spread signal is despread using the same spreading code as the spreading code on the receiving side to restore the narrowband signal and extract the original information.
If such spread spectrum communication is performed as an electronic key system of a vehicle, even if noise is mixed in the spread signal transmitted from the transmission side, the noise component is diffused when the spread signal is restored to the original information signal on the reception side. Therefore, the influence of noise can be reduced. Accordingly, it is possible to ensure good wireless communication between the in-vehicle device and the portable device.

JP 2001-31333 A JP 2000-261366 A

  By the way, in such an electronic key system for a vehicle, when an abnormal situation occurs, for example, it becomes impossible to perform wireless communication between the in-vehicle device 10 and the portable device 20, the dealer, for example, Communication analysis may be performed to check whether there is an abnormality in the wireless communication between the in-vehicle device 10 and the portable device 20. However, in the electronic key system that performs the spread spectrum modulation described above, since the radio signal transmitted from the in-vehicle device 10 or the portable device 20 is a signal subjected to the spread spectrum modulation, the radio signal cannot be analyzed as it is. There's a problem.

  The present invention has been made in view of such circumstances, and its purpose is to analyze a radio signal exchanged between an in-vehicle device and a portable device even when a spread spectrum communication method is adopted as a wireless communication method. An object of the present invention is to provide an electronic key system for a vehicle that can be used.

  In order to solve the above-mentioned problem, the invention according to claim 1 allows the vehicle control by the in-vehicle device to be executed by transmitting and receiving a radio signal between the in-vehicle device mounted on the vehicle and the portable device. In the vehicle-mounted device and the portable device, when transmitting and receiving the wireless signal, the wireless signal is modulated into a narrowband signal to generate a narrowband signal, and based on the same spreading code set for each In an electronic key system for a vehicle that spreads and modulates the narrowband signal and transmits / receives the modulated spread signal, the vehicle-mounted device or a detection unit that detects a specific operation on the portable device, the vehicle-mounted device, or The portable device changes the transmission mode from the transmission mode in which the spread signal is transmitted based on the detection of the specific operation by the detection unit. It is summarized in that to switch to the transmission mode for transmitting a band signal.

  According to this configuration, when the dealer performs a specific operation on the in-vehicle device or the portable device, a narrowband signal is transmitted from the in-vehicle device or the portable device instead of the spread signal. If a narrowband signal is transmitted from the in-vehicle device or the portable device in this way, the dealer can analyze the radio signal transmitted and received between the in-vehicle device and the portable device.

  According to a second aspect of the present invention, execution of vehicle control by the in-vehicle device is permitted by transmitting and receiving radio signals between the in-vehicle device and the portable device mounted on the vehicle, and the in-vehicle device and the portable device. Then, when transmitting and receiving the radio signal, the radio signal is modulated into a narrow band signal to generate a narrow band signal, and the narrow band signal is spread and modulated based on the same spreading code set for each. In the vehicle electronic key system that transmits and receives the modulated spread signal, the vehicle-mounted device or the portable device includes a detection unit that detects a specific operation on the vehicle-mounted device or the portable device. A narrow-band signal transmission means for transmitting a signal, and the narrow-band signal transmission based on the detection of the specific operation by the detection means. It is summarized in that a radio signal is transmitted including the spread code through stages.

  According to this configuration, when the dealer performs a specific operation on the in-vehicle device or the portable device, a radio signal including the spread code is transmitted from the in-vehicle device or the portable device. For this reason, if a dealer receives a radio signal including the spreading code by a required device, the dealer can obtain the spreading code, and therefore, the dealer can analyze the radio signal exchanged between the in-vehicle device and the portable device. become able to.

  According to a third aspect of the present invention, in the electronic key system for a vehicle according to the first or second aspect, the detection means is a specific wireless signal different from a wireless signal transmitted and received between the in-vehicle device and the portable device. The gist is that a signal is received by the in-vehicle device or the portable device as the specific operation.

  As the specific operation described above, for example, a specific operation on an operation button provided on a portable device, specifically, an operation of simultaneously pressing two operation buttons, or the like can be employed. However, when the operation on the operation button of the portable device is adopted as a specific operation in this way, there is a possibility that a user holding the portable device may accidentally press the two operation buttons simultaneously. . When such a situation occurs, the transmission mode of the portable device is switched from the transmission mode for transmitting the narrowband signal against the user's intention in the invention described in claim 1 above. The in-vehicle device cannot receive the wireless signal, and there is a possibility that the wireless communication between the portable device and the in-vehicle device may be hindered. Moreover, in the invention according to the second aspect, since a radio signal including the spread code is transmitted against the user's intention, this radio signal may be intercepted by a third party. There is a possibility that the spreading code is known to a third party and the security level is lowered. In this regard, as described above, if the reception of a specific radio signal is adopted as a specific operation, a situation in which the transmission mode of the in-vehicle device or the portable device is switched due to a user's erroneous operation is avoided. Therefore, it is possible to avoid a situation that hinders wireless communication between the on-vehicle device and the portable device as described above. In addition, it is possible to avoid a situation in which a radio signal including the spreading code is transmitted due to an erroneous operation by the user, and thus it is possible to maintain a high security level.

  According to the electronic key system for a vehicle according to the present invention, even when the spread spectrum communication method is adopted as a wireless communication method, a wireless signal exchanged between the in-vehicle device and the portable device can be analyzed. Become.

The block diagram which shows the system structure about 1st Embodiment of the electronic key system of the vehicle concerning this embodiment. (A), (b) is a block diagram which respectively shows those system configurations about the transmitter of the portable device of 1st Embodiment, and the receiver of a vehicle-mounted apparatus. The block diagram which shows the mode of the wireless communication between the portable apparatus and test | inspection apparatus of the 1st Embodiment. The block diagram which shows the system configuration | structure about 2nd Embodiment of the electronic key system of the vehicle concerning this embodiment. The block diagram which shows the mode of the wireless communication between the portable apparatus and test | inspection apparatus of the said 2nd Embodiment. The top view which shows the outline | summary of an electronic key system typically.

[First Embodiment]
A first embodiment of an electronic key system for a vehicle according to the present invention will be described below with reference to FIGS. The basic configuration of the electronic key system to which this embodiment is applied is the same as that of the electronic key system illustrated in FIG. FIG. 1 is a block diagram showing the system configuration of such an electronic key system. First, the configuration and operation of this electronic key system will be described more specifically with reference to FIG.

  As shown in FIG. 1, in this electronic key system, various communication controls by wireless communication are executed between the in-vehicle device 10 mounted on the vehicle side and the portable device 20 carried by the user.

  Here, the in-vehicle device 10 is provided with a receiving device 12 for receiving a response signal Sa transmitted from the portable device 20 together with a transmitting device 11 for transmitting the request signal Sr to the portable device 20. Yes. Further, the in-vehicle device 10 is provided with an operation button 16a which is a portion to be pressed by the user when starting the engine 15, and the engine start switch 16 is configured by the operation button 16a. The transmission control of the request signal Sr by the transmission device 11 and the processing of the response signal Sa received through the reception device 12 are performed in an integrated manner through the vehicle control device 13 that is also provided in the in-vehicle device 10. Incidentally, the vehicle control device 13 is also a part that controls starting and stopping of the engine 15 when a pressing operation of the operation button 16a is detected. The vehicle control device 13 is also a part that controls the door lock device 14 that locks / unlocks the vehicle door. The vehicle control device 13 includes a non-volatile memory 13 a in which a vehicle identification code unique to the vehicle, a portable device identification code unique to the portable device 20, and the like are stored.

  On the other hand, the portable device 20 includes a receiving device 21 for receiving the request signal Sr transmitted from the in-vehicle device 10 and a transmission for transmitting a response signal Sa to the in-vehicle device 10 based on the reception of the request signal Sr. A device 22 is provided. Then, the generation of the response signal Sa based on the request signal Sr received through the reception device 21 and the transmission control of the generated response signal Sa through the transmission device 22 are also provided in the portable device 20. It is performed centrally through the device 23. The portable device control device 23 also has a built-in nonvolatile memory 23a that stores a vehicle identification code unique to the vehicle, a portable device identification code unique to the portable device 20, and the like. By the way, the portable device 20 is provided with a lock button 24 and an unlock button 25 that are pressed by the user based on the intention to lock / unlock the vehicle door, for example. When the pressing operation of these buttons 24 and 25 is detected, a signal indicating that is generated and transmitted from the transmission device 22.

  In the electronic key system configured as described above, the vehicle control device 13 generates a request signal Sr including information such as a vehicle identification code stored in the memory 13a and outputs the request signal Sr to the outside communication area. It is assumed that transmission is performed to A1 or the in-vehicle communication area A2. At this time, if the portable device 20 possessed by the user enters the communication areas A1 and A2, signal exchange is performed between the in-vehicle device 10 and the portable device 20 in the following manner.

  That is, in this system, for example, the request signal Sr subjected to amplitude shift keying (ASK modulation) by the transmitting device 11 is received by the receiving device 21, and after the request signal Sr is demodulated by the receiving device 21, Is transmitted to the machine controller 23. When the request signal Sr is transmitted in this way, the portable device control device 23 collates the vehicle identification code included in the request signal Sr with the vehicle identification code stored in the memory 23a, and the mutual vehicle identification code is obtained. If it is determined that they match, the response signal Sa is transmitted. That is, the portable device control device 23 generates a response signal Sa including information such as a portable device identification code stored in the memory 23 a and transmits the response signal Sa to the transmission device 22. In addition, the transmission device 22 performs spread spectrum modulation on the transmitted response signal Sa and then transmits the spread modulated response signal Sa to the in-vehicle device 10. When the response signal Sa is transmitted in this manner, the receiving device 12 of the in-vehicle device 10 receives the response signal Sa, demodulates the received response signal Sa, and then transmits the demodulated response signal Sa to the vehicle control device 13. introduce. The vehicle control device 13 collates the portable device identification code included in the transmitted response signal Sa with the portable device identification code stored in the memory 13a, and the portable device identification codes match each other. When it is determined, various vehicle controls are executed. That is, the vehicle door is unlocked through the door lock device 14 or the engine 15 is allowed to start. Incidentally, when the user pushes the operation button 16a when the engine 15 is permitted to start, the engine 15 starts.

  Next, the configurations of the transmission device 22 and the reception device 12 will be described more specifically with reference to FIGS. 2A and 2B show the configurations of the transmission device 22 and the reception device 12 as block diagrams.

  2A, the transmitter 22 is provided with a modulator 22a that takes in the response signal Sa transmitted from the portable device controller 23 and performs frequency displacement modulation (FSK modulation). In this modulator 22a, the response signal Sa subjected to FSK modulation is transmitted to the spread modulator 22b. That is, the modulator 22a functions as a part that modulates the response signal Sa into a narrow-band signal. The transmission device 22 is also provided with a spread code generator 22c that provides a spread code such as a PN (Pseudorandom Noise) code to the spread modulator 22b. Then, the spread modulator 22b multiplies the FSK modulated response signal Sa by the spread code given by the spread code generator 22c to convert the frequency band into a wide frequency band, a so-called direct spread spectrum. This is the part that performs spread modulation. The transmitter 22 has a structure in which the response signal Sa that has been spread-modulated through the spread modulator 22b is transmitted through the antenna 22d.

  On the other hand, as shown in FIG. 2 (b), the receiving device 12 is basically a process opposite to the process performed by the transmitting device 22 on the response signal Sa received via the antenna 12a. It is a part to apply. That is, the receiving apparatus 12 includes the FSK modulation together with the despreading demodulator 12b that despreads the response signal Sa by multiplying the response signal Sa by the spreading code given by the spreading code generator 12d. A demodulator 12c that takes in the response signal Sa and performs FSK demodulation is provided. The receiving device 12 is configured to transmit the response signal Sa demodulated in this way to the vehicle control device 13.

  By the way, when performing spread spectrum communication between the transmission device 22 and the reception device 12 in this way, the spreading code used in the transmission device 22 and the spreading code used in the reception device 12 are made to coincide with each other. It is necessary to synchronize so-called spreading codes.

  Therefore, in this embodiment, paying attention to the fact that the vehicle identification codes stored in the memory 13a of the vehicle control device 13 and the memory 23a of the portable device control device 23 match each other, the vehicle identification code is used. The spreading code is synchronized. Specifically, the same map showing the relationship between a variable value obtained by performing predetermined arithmetic processing on the vehicle identification code and a plurality of types of spreading codes is the memory 13a of the vehicle control device 13 and the portable device control device 23. Are respectively stored in the memory 23a. The vehicle control device 13 and the portable device control device 23 perform predetermined arithmetic processing on the vehicle identification codes stored in the respective memories 13a and 23a to obtain variable values, and then, based on the obtained variable values. A spreading code is determined by performing a map operation using the map. Incidentally, the vehicle control device 13 and the portable device control device 23 store the determined spreading codes in the memories 13a and 23a, respectively. Then, as shown in FIG. 2 (a), the portable device control device 23 controls the spread code generator 22c so as to give the determined spread code to the spread modulator 22b. ), The vehicle control device 13 controls the spread code generator 12d so as to give the determined spread code to the despread demodulator 12b. If the spreading code is determined by such a method, the vehicle identification codes stored in the vehicle control device 13 and the portable device control device 23 match each other, and therefore are determined by the vehicle control device 13 and the portable device control device 23. Spread codes coincide with each other. That is, spreading code synchronization can be achieved.

  On the other hand, in the electronic key system that performs such spread spectrum modulation, since the response signal Sa transmitted from the portable device 20 is a radio signal subjected to spread spectrum modulation, there is a problem that the response signal Sa cannot be analyzed as it is. Is as described above.

  Therefore, in the present embodiment, on the condition that the portable device 20 receives a predetermined signal, the transmission mode of the portable device 20 is changed from the transmission mode in which the response signal Sa that has been subjected to the spread modulation to the FSK-modulated response. The transmission mode for transmitting the signal Sa is switched. That is, the transmission mode in which the response signal Sa subjected to the spread modulation is transmitted is switched to the transmission mode in which the response signal Sa in the narrow band is transmitted.

  FIG. 3 shows the operation of the portable device 20 when the dealer performs communication analysis using the inspection device. Next, the operation of the portable device 20 will be described in detail with reference to FIG. In FIG. 3, the lock button 24 and the unlock button 25 are omitted for convenience.

  For example, it is assumed that a communication mode switching signal Sc indicating a command for switching the transmission mode is transmitted from the inspection device 30 to the portable device 20 when the dealer operates the inspection device 30 as required. At this time, the communication mode switching signal Sc is received by the receiving device 21 of the portable device 20, and the communication mode switching signal Sc is transmitted to the portable device control device 23. In the portable device control device 23, when the communication mode switching signal Sc is thus transmitted, the function of the spread modulator 22b is temporarily stopped. As a result, the radio signal transmitted from the modulator 22a to the spread modulator 22b, that is, the response signal Sa subjected to FSK modulation is directly transmitted to the antenna 22d. Therefore, the response signal Sa subjected to FSK modulation is transmitted to the portable device. 20 is transmitted. Therefore, if the dealer receives this FSK-modulated response signal Sa by the inspection device 30, the dealer can analyze the response signal Sa and check whether the response signal Sa is an appropriate signal. Become.

  Incidentally, if the dealer re-transmits the communication mode switching signal Sc from the inspection device 30 by operating the inspection device 30 as required, the communication mode switching signal Sc is received again by the portable device 20 and the portable device control device 23 restores the function of the spread modulator 22b. That is, in this case, the response signal Sa subjected to spread modulation is transmitted again from the transmission device 22. Thus, in this embodiment, whenever the portable device 20 receives the communication mode switching signal Sc, the transmission mode of the portable device 20 is the transmission mode for transmitting the response signal Sa subjected to the spread modulation, and the FSK modulation is performed. It is configured to switch to one of transmission modes for transmitting the response signal Sa.

  By the way, as a specific operation for switching the transmission mode of the transmission device 22, in addition to the operation of transmitting the communication mode switching signal Sc to the portable device 20 as described above, for example, the lock button 24 and unlocking of the portable device 20 are performed. It is also possible to employ an operation of simultaneously pressing the buttons 25. However, when such an operation is adopted, if the user holding the portable device 20 accidentally presses the two buttons 24 and 25 at the same time, the transmission mode of the portable device 20 is contrary to the user's intention. There is a risk of switching to a transmission mode in which the FSK-modulated response signal Sa is transmitted. And when the transmission mode of the portable device 20 is switched in this way, the in-vehicle device 10 cannot receive the response signal Sa transmitted from the portable device 20, and the in-vehicle device 10 and the portable device 20 May interfere with wireless communication. In this regard, as in the electronic key system of the present embodiment, if the transmission mode of the transmission device 22 is switched based on the reception of the communication mode switching signal Sc by the portable device 20, the portable device 20 is caused by a user's erroneous operation. It is possible to avoid a situation where the transmission mode is switched. For this reason, the situation which interferes with the wireless communication between the above-mentioned vehicle-mounted apparatus 10 and the portable device 20 as mentioned above can be avoided.

As described above, according to the electronic key system for a vehicle according to the present embodiment, the following effects can be obtained.
(1) Based on the fact that the portable device 20 receives the communication mode switching signal Sc transmitted from the inspection device 30, the transmission mode of the transmission device 22 is changed from the transmission mode of transmitting the response signal Sa subjected to the spread modulation to the FSK. The transmission mode is changed to transmit the modulated response signal Sa. That is, the transmission mode in which the response signal Sa subjected to spread modulation is transmitted is switched to the transmission mode in which the response signal Sa in the narrow band is transmitted. Accordingly, when the dealer performs a required operation on the inspection device 30, the FSK-modulated response signal Sa is transmitted from the portable device 20, so that the exchange is performed between the in-vehicle device 10 and the portable device 20. It is possible to analyze the response signal Sa.

  (2) A specific operation for the portable device 20, that is, a specific operation for switching the transmission mode of the transmission device 22 based on the reception of the communication mode switching signal Sc transmitted from the inspection device 30. Detected. Thereby, since it is possible to avoid a situation where the transmission mode of the portable device 20 is switched due to an erroneous operation by the user, a situation where the wireless communication between the in-vehicle device 10 and the portable device 20 is hindered is avoided. Will be able to.

(3) Based on the fact that the portable device 20 receives the communication mode switching signal Sc transmitted from the inspection device 30 again, the transmission mode of the transmission device 22 is changed from the transmission mode in which the FSK-modulated response signal Sa is transmitted. The response mode Sa which has been spread modulated is returned to the transmission mode. Thereby, the structure which returns the transmission aspect of the portable device 20 can also now be easily realized.
[Second Embodiment]
Next, a second embodiment of the electronic key system for a vehicle according to the present invention will be described with reference to FIGS. In the second embodiment, the basic configuration of the electronic key system is similar to the configuration illustrated in FIG. 1 and FIG. 2, and here, as a diagram corresponding to FIG. The system configuration is shown in FIG. In the following, the same elements as those shown in FIGS. 1 and 2 are denoted by the same reference numerals, and redundant description is omitted, and the differences between the two will be mainly described below.

  As shown in FIG. 4, in this electronic key system, the request signal Sr and the response signal Sa are exchanged between the in-vehicle device 10 and the portable device 20 if an abnormality such as a battery running out occurs in the portable device 20. Even when it becomes impossible to do so, a configuration is provided that enables wireless communication between them.

  That is, the in-vehicle device 10 is provided with an immobilizer 16b that is disposed in the engine start switch 16 and transmits the driving radio wave Si to the portable device 20. Incidentally, the immobilizer 16b also functions as a part that receives the transponder signal St transmitted from the portable device 20. Then, transmission control of the driving radio wave Si by the immobilizer 16b and processing of the transponder signal St received through the immobilizer 16b are performed through the vehicle control device 13.

  On the other hand, the portable device 20 is provided with a transmission / reception device 26 capable of transmitting / receiving a narrowband radio signal instead of the reception device 21. That is, the transmission / reception device 26 functions as a portion that receives the request signal Sr and the driving radio wave Si transmitted from the in-vehicle device 10, and also functions as a portion that transmits the transponder signal St. Further, the portable device control device 23 has a built-in transponder unit 23b that is activated by obtaining a drive power source by transmitting the drive radio wave Si from the transmission / reception device 26. The transponder unit 23b is a part that transmits the transponder signal St to the in-vehicle device 10 when activated.

  In the electronic key system configured as described above, when the driving radio wave Si is transmitted from the immobilizer 16b and the user brings the portable device 20 close to the engine start switch 16, the following is performed. In this manner, signal exchange is performed between the in-vehicle device 10 and the portable device 20.

  That is, in this system, the driving radio wave Si transmitted from the immobilizer 16 b is received by the transmission / reception device 26, and the driving radio wave Si is transmitted to the portable device control device 23. In the portable device control device 23, when the driving radio wave Si is thus transmitted, the transponder unit 23b is activated by obtaining the driving power from the driving radio wave Si, and the activated transponder unit 23b is stored in the memory 23a. A transponder signal St including a portable device identification code is generated and transmitted from the transmitting / receiving device 26. Then, in the in-vehicle device 10, the transponder signal St is received by the immobilizer 16 b and the received transponder signal St is transmitted to the vehicle control device 13. The vehicle control device 13 collates the portable device identification code included in the transponder signal St with the portable device identification code stored in the memory 13a, and the portable device identification codes match each other through this collation. If it is determined, the start of the engine 15 is permitted.

Incidentally, in this embodiment, the user can lock / unlock the vehicle door by using a mechanical key (not shown) attached to the portable device 20.
According to such a configuration as an electronic key system for a vehicle, even if the portable device 20 has an abnormality such as a dead battery, the portable device 20 receives the driving radio wave Si transmitted from the in-vehicle device 10. Wireless communication can be performed between the in-vehicle device 10 and the portable device 20.

  By the way, in the present embodiment, a wireless signal including a spread code is transmitted from the portable device 20 to the inspection device 30 by using wireless communication through transmission / reception of the driving radio wave Si and the transponder signal St, so-called transponder communication. Yes. Then, the inspection device 30 acquires the spread code information from the wireless signal, thereby enabling wireless communication between the inspection device 30 and the portable device 20, thereby enabling the inspection device 30 to analyze the response signal Sa. Yes.

  FIG. 5 is a diagram corresponding to FIG. 3 and shows the operation of the portable device 20 when a dealer performs communication analysis using an inspection device. Next, referring to FIG. The operation of the machine 20 will be described in detail. In FIG. 5, the lock button 24 and the unlock button 25 are omitted for convenience.

  For example, it is assumed that a spread code request driving radio wave Sd including a command to transmit a spread code is transmitted from the inspection device 30 to the portable device 20 by the dealer operating the inspection device 30 as required. At this time, the spread code request drive radio wave Sd is received by the transmission / reception device 26 of the portable device 20, and the transponder unit 23b is activated by obtaining drive power from the spread code request drive radio wave Sd. At this time, the transponder unit 23 b generates a spread code signal Sp including the spread code stored in the memory 23 a based on the reception of the spread code request drive radio wave Sd and transmits it from the transmission / reception device 26. And in the test | inspection apparatus 30, the spreading code determined with the portable device 20 is acquired by extracting the information of the spreading code contained in the spreading code signal Sp. Accordingly, the inspection device 30 obtains the original FSK-modulated response signal Sa by performing the same signal processing as that of the receiving apparatus 12 illustrated in FIG. 2B based on the acquired spreading code. Will be able to. That is, the dealer can analyze the response signal Sa by the inspection device 30.

  By the way, as a specific operation for transmitting the spread code signal Sp from the portable device 20, in addition to the operation of transmitting the spread code request drive radio wave Sd to the portable device 20 as described above, for example, as described above, the portable device 20 It is also possible to employ an operation of simultaneously pressing the lock button 24 and the unlock button 25. However, when such an operation is adopted, if the user holding the portable device 20 accidentally presses the two buttons 24 and 25 at the same time, a spread code request is issued from the portable device 20 against the user's intention. The driving radio wave Sd is transmitted. If the spread code request drive radio wave Sd transmitted in this way is intercepted by a third party, the spread code is known to the third party, which may cause a decrease in security level. . In this regard, if the spread code signal Sp is transmitted from the portable device 20 based on reception of the spread code request drive radio wave Sd as in the electronic key system of the present embodiment, the spread from the portable device 20 due to a user's erroneous operation. Since the situation where the code signal Sp is transmitted can be avoided, the security level can be maintained high.

As described above, according to the electronic key system for a vehicle according to the present embodiment, the following effects can be obtained.
(4) The spread code signal Sp including the spread code is transmitted from the portable device 20 based on the reception of the spread code request driving radio wave Sd transmitted from the inspection device 30. Thereby, since the dealer can acquire the spread code if the inspection device 30 receives the spread code signal Sp, the dealer can analyze the response signal Sa exchanged between the in-vehicle device 10 and the portable device 20. become able to.

(5) Based on the fact that the portable device 20 receives the spreading code request drive radio wave Sd transmitted from the inspection device 30, a specific operation for the portable device 20, that is, for causing the portable device 20 to transmit the spreading code signal Sp. Detect specific operations. As a result, it is possible to avoid a situation in which the spread code signal Sp is transmitted from the portable device 20 due to an erroneous operation by the user, so that a high security level can be maintained.
(Other embodiments)
In addition, each said embodiment can also be implemented with the following forms which changed this suitably.

  In the first embodiment, based on the fact that the portable device 20 receives the communication mode switching signal Sc transmitted from the inspection device 30 again, the transmission mode of the transmission device 22 is changed to the FSK-modulated response signal Sa. The transmission mode is changed back to the transmission mode in which the response signal Sa subjected to the spread modulation is transmitted. Instead of this, for example, when the transmission mode of the transmission device 22 is changed to the transmission mode for transmitting the FSK-modulated response signal Sa, the transmission mode may be restored when a predetermined time has elapsed.

  In the second embodiment, the transmitter / receiver 26 is employed as a narrowband signal transmitting unit capable of transmitting a narrowband signal, and the portable device 20 and the inspection device 30 are used by using the transmitter / receiver 26. The spread code signal Sp is transmitted from the portable device 20 to the inspection device 30 by performing transponder communication between them. Instead of this, for example, a new transmission / reception device capable of transmitting / receiving a narrowband signal to / from the inspection device 30 is newly provided in the portable device 20, and then the portable device is used by using the newly provided transmission / reception device. The spread code signal Sp may be transmitted from the portable device 20 to the inspection device 30 by performing wireless communication between the wireless communication device 20 and the inspection device 30.

  In each of the above embodiments, a specific operation on the portable device 20 is detected based on the fact that the portable device 20 receives the communication mode switching signal Sc and the spread code request driving radio wave Sd transmitted from the inspection device 30. . Instead, for example, a specific terminal is provided on a circuit board constituting the portable device control device 23, and the voltage at this terminal is detected to be changed from a logic low level to a logic high level. A specific operation on the portable device 20 may be detected. Or you may make it detect specific operation with respect to the portable device 20 based on detecting that the said lock button 24 and the unlock button 25 of the portable device 20 were pressed simultaneously. If a specific operation on the portable device 20 is detected using the lock button 24 and the unlock button 25, the portable device is compared with a case where an operation button for detecting a specific operation is newly provided. The structure of 20 can be simplified. Of course, it is needless to say that an operation button for detecting a specific operation may be newly provided on the portable device 20. What is necessary is just to be able to detect specific operation with respect to the portable device 20 as such detection means.

  In each of the above embodiments, the communication mode switching signal Sc and the spread code request driving radio wave Sd are transmitted from the inspection device 30. Instead, these signals are transmitted from an external communication device different from the inspection device 30. Sc and Sd may be transmitted.

  In each of the above embodiments, the response signal Sa is FSK modulated in the modulator 22a of the transmission device 22, but instead, for example, the response signal Sa is amplitude-shift-modulated (ASK modulated) in the modulator 22a. Or phase shift keying (PSK modulation). In addition, the response signal Sa may be ASK demodulated or PSK demodulated by the demodulator 12 c of the receiving device 12.

In each of the above embodiments, the spread spectrum communication method is adopted as the wireless communication method between the transmission device 22 and the reception device 12. In addition to this, for example, when there is a concern about the influence of noise that can be received by the receiving device 21, the spread spectrum communication method may be adopted as the wireless communication method between the transmitting device 11 and the receiving device 21. . Alternatively, the spread spectrum communication method may be adopted only for the wireless communication method between the transmission device 11 and the reception device 21. Further, when the spread signal is transmitted from the in-vehicle device 10 in this way, for example, when a specific operation on a specific operation button provided on the vehicle is detected, the transmission mode of the transmission device 11 is switched, or A radio signal including a spread code may be transmitted from the in-vehicle device 10 to the inspection device 30.
(Appendix)
Next, a technical idea that can be grasped from the above embodiment and its modifications will be additionally described.

  (A) In the vehicle electronic key system according to claim 1 or 2, the detection means detects a specific operation on an operation button provided on the portable device as the specific operation. The vehicle's electronic key system features. According to this configuration, a specific operation can be detected using an operation button that is already installed in the mobile device. Therefore, compared to a case where a configuration for detecting a specific operation is newly provided, The structure can be simplified.

  (B) In the electronic key system for a vehicle according to claim 1, the in-vehicle device or the portable device switches the transmission mode to a transmission mode for transmitting the narrowband signal, and then performs the specification by the detection unit. An electronic key system for a vehicle, wherein the transmission mode is returned to the transmission mode for transmitting the spread signal based on the fact that the operation of is detected again. According to this configuration, it is possible to easily realize a configuration in which the transmission mode of the in-vehicle device or the portable device is returned to the transmission mode for transmitting the spread modulation signal.

  Sa ... Response signal, Sc ... Communication mode switching signal, Sd ... Spread code request drive radio wave, Si ... Drive radio wave, Sp ... Spread code signal, Sr ... Request signal, St ... Transponder signal, 10 ... In-vehicle device, 11, 22 ... Transmitting device 12, 21 ... receiving device, 12a, 22d ... antenna, 12b ... despreading demodulator, 12c ... demodulator, 12d ... spreading code generator, 13 ... vehicle control device, 13a, 23a ... memory, 14 ... door Lock device, 15 ... Engine, 16 ... Engine start switch, 16a ... Operation button, 16b ... Immobilizer, 20 ... Portable device, 22a ... Modulator, 22b ... Spreading modulator, 22c ... Spreading code generator, 23 ... Portable device control Device: 23b: Transponder unit, 24: Lock button, 25: Unlock button, 26: Transmission / reception device, 30: Inspection device

Claims (3)

Execution of vehicle control by the in-vehicle device is permitted by transmitting and receiving a radio signal between the in-vehicle device and the portable device mounted on the vehicle, and the in-vehicle device and the portable device transmit and receive the wireless signal. The wireless signal is modulated into a narrowband signal to generate a narrowband signal, and the narrowband signal is spread-modulated based on the same spread code set for each, and the modulated spread signal is transmitted / received In the vehicle electronic key system
The vehicle-mounted device or the portable device includes a detection unit that detects a specific operation on the vehicle-mounted device or the portable device, and the vehicle-mounted device or the portable device transmits the specific operation based on the detection of the specific operation by the detection device. An electronic key system for a vehicle, wherein the transmission mode for transmitting the spread signal is switched to the transmission mode for transmitting the narrowband signal. Execution of vehicle control by the in-vehicle device is permitted by transmitting and receiving a radio signal between the in-vehicle device and the portable device mounted on the vehicle, and the in-vehicle device and the portable device transmit and receive the wireless signal. The wireless signal is modulated into a narrowband signal to generate a narrowband signal, and the narrowband signal is spread-modulated based on the same spread code set for each, and the modulated spread signal is transmitted / received In the vehicle electronic key system
The vehicle-mounted device or the portable device includes a detection unit that detects a specific operation on the vehicle-mounted device or the portable device, and the vehicle-mounted device or the portable device includes a narrowband signal transmission unit that transmits the narrowband signal. An electronic key system for a vehicle, wherein a radio signal including the spreading code is transmitted through the narrowband signal transmitting means based on detection of the specific operation. The detecting means detects that the in-vehicle device or the portable device has received a specific wireless signal different from a wireless signal transmitted and received between the in-vehicle device and the portable device as the specific operation. The vehicle electronic key system according to claim 1 or 2.

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