JP5319436B2 - Electronic key system for vehicle and setting method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular electronic key system capable of ensuring a good radio communication between an on-vehicle device and a portable machine while avoiding any increase in the manufacturing man-hour of a vehicle even when employing the communication system based on the spectrum diffuse modulation. <P>SOLUTION: The vehicular electronic key system collates the authentication code registered in an on-vehicle device 10 with the authentication code registered in a portable machine 20 by transmitting/receiving the request signals Sre1, Sre2 and the response signal San between the on-vehicle device 10 and the portable machine 20, and controls various kinds of vehicles through the collation. Further, the on-vehicle device 10 and the portable machine 20 transmit/receive the signals subjected to the spectrum diffuse modulation by executing the processing of the spectrum diffuse modulation of the response signal San by the diffusion signal when transmitting/receiving the temperature signal San. Here, the on-vehicle device 10 and the portable machine 20 selects the diffusion signal, respectively, based on the vehicle identification code as the authentication code. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an electronic key system for a vehicle that executes various types of vehicle control through wireless communication between an in-vehicle device and a portable device. In particular, the electronic device for a vehicle adopting a communication method based on spread spectrum modulation as a wireless communication method. The present invention relates to a key system and a setting method thereof.

  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. 10 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. 10, in this electronic key system, the user who has the portable device 20 is set in an area indicated by a two-dot chain line in the drawing, that is, a communication area R1 set outside the vehicle compartment, or in the vehicle interior. When the vehicle enters the communication area R2, wireless communication is performed between the in-vehicle device 10 mounted on the vehicle and the portable device 20. Then, through this wireless communication, the authentication codes registered in the in-vehicle device 10 and the portable device 20 are collated, and on the condition that it is determined that the mutual authentication codes match through this collation. Various vehicle controls such as door lock / unlock control and engine start permission are executed. As an authentication code, a vehicle identification code (vehicle ID code) set for each vehicle to identify a plurality of vehicles from each other, or set for each portable device to identify a plurality of portable devices A portable device identification code (portable device ID code) or the like is used. 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 operation of the vehicle is greatly improved.

  On the other hand, with regard to such an electronic key system for vehicles, 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. Therefore, it has been proposed to employ a communication system based on spread spectrum modulation as a wireless communication system. By the way, the communication method based on spread spectrum modulation is that the transmitting side transmits a signal (spread signal) obtained by spreading the information signal to be transmitted with a predetermined spreading code to the receiving side, and the receiving side receives the received spread signal. This is a communication method for restoring the original information signal by despreading using the same spreading code as the spreading code on the side. If a communication system based on such spread spectrum modulation is adopted as an electronic key system for a vehicle, even if noise is mixed in the spread signal transmitted from the transmission side, the original information signal is restored from the spread signal on the reception side. Noise is diffused to the surface. Therefore, since it becomes possible to reduce the influence of noise, 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 the electronic key system of the above-mentioned vehicle, for example, in a situation where two vehicles equipped with the same electronic key system are close to each other, between the in-vehicle device mounted on each vehicle and the portable device When wireless communication is performed in each case, wireless communication of the electronic key system of each vehicle may interfere with each other, and wireless communication may not be performed properly. For this reason, in the vehicle electronic key system using the communication system based on the spread spectrum modulation, a plurality of different types of spreading codes can be assigned to the electronic key system of each vehicle in order to avoid such radio communication interference. desirable. Incidentally, as a method of assigning different types of spreading codes to the electronic key system of each vehicle, for example, a plurality of types of spreading codes are prepared in advance, and at the time of vehicle manufacture, a plurality of types of spreading codes are assigned to each vehicle. A method of registering the assigned spreading code in the in-vehicle device and the portable device is conceivable.

  However, assuming that such a method is adopted, at the time of vehicle manufacture, a step of registering the same spreading code as the spreading code registered in the in-vehicle device, that is, a step of synchronizing the respective spreading codes of the in-vehicle device and the portable device Etc. are newly required. For this reason, the man-hour in manufacturing a vehicle is caused, and there is a possibility that the production cost may be increased.

  As described above, in an electronic key system for a vehicle using a communication method based on spread spectrum modulation, an attempt to secure good wireless communication between the in-vehicle device and the portable device increases the manufacturing man-hours and production of the vehicle. There is still room for improvement in terms of increasing costs.

  The present invention has been made in view of such circumstances, and the purpose thereof is to avoid an increase in the number of manufacturing steps of the vehicle while avoiding an increase in the number of manufacturing steps of the vehicle, even when a communication method based on spread spectrum modulation is adopted. It is an object to provide an electronic key system for a vehicle capable of ensuring good wireless communication between the two and a setting method thereof.

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that an authentication code registered in the in-vehicle device by transmitting and receiving a radio signal between the in-vehicle device mounted on the vehicle and the portable device, and the The verification with the authentication code registered in the portable device is performed, and execution of various vehicle controls by the in-vehicle device is permitted on condition that it is determined through the verification that the mutual authentication codes match. In transmitting and receiving a radio signal between the in-vehicle device and the portable device, the transmitting side performs a process of performing spread spectrum modulation on the wireless signal with a spread code set on the transmitting side, and on the receiving side, In an electronic key system for a vehicle that performs a process of demodulating the spread spectrum modulated signal using a spreading code set on the receiving side, the in-vehicle device and the portable device It is directed to subject matter determining respectively the spread code on the basis of the authentication code being the registration.

  According to this configuration, since the authentication code registered in the in-vehicle device and the authentication code registered in the portable device match each other, the spreading code determined by the in-vehicle device and the spreading code determined by the portable device Can be matched with each other. That is, the spread codes of the in-vehicle device and the portable device can be automatically synchronized. This eliminates the need to newly provide a process for synchronizing the spreading codes of the in-vehicle device and the portable device in the vehicle manufacturing process, thereby reducing the number of manufacturing steps for the vehicle. In addition, since the authentication codes are usually different for each vehicle, for example, when in-vehicle devices mounted on a plurality of vehicles each determine a spreading code, each in-vehicle device determines a plurality of different types of spreading codes. It is also possible to make it. If each in-vehicle device determines a plurality of different types of spreading codes, the electronic key system of each vehicle executes the situation even when the above-mentioned two vehicles are close to each other. It is possible to reduce the possibility of radio communication interference. For this reason, it becomes possible to ensure good wireless communication between the in-vehicle device and the portable device.

  According to a second aspect of the present invention, the in-vehicle device and the portable device have a relationship between a variable value obtained by performing predetermined arithmetic processing on the authentication code and a plurality of types of spreading codes specified by the variable value. And determining the spread code based on the authentication code, after performing a predetermined arithmetic process on the authentication code to obtain the variable value, and then based on the obtained variable value The gist is that it is performed by selecting the spreading code by map calculation using a map.

  According to this configuration, even if the authentication code and the spread code are not similar to each other, the in-vehicle device and the portable device perform predetermined calculation processing and map calculation based on the authentication code registered in each of them. Since the spreading code can be determined only by this, the spreading code based on the authentication code can be determined very easily.

  According to the electronic key system for a vehicle according to claim 1 or 2, as in the invention according to claim 3, a vehicle identification code set separately for each vehicle in order to identify a plurality of vehicles from each other. When included in the authentication code, it is effective to adopt a configuration in which the determination of the spreading code based on the authentication code is performed as the determination of the spreading code based on the vehicle identification code. By adopting such a configuration, it is possible to easily realize a configuration in which each of the on-vehicle devices described above determines a plurality of different types of spreading codes.

  According to a fourth aspect of the present invention, in the electronic key system for a vehicle according to any one of the first to third aspects, wireless communication based on the spread spectrum modulation is performed between the in-vehicle device and the portable device. Notification means for notifying that the respective spread codes determined by the in-vehicle device and the portable device do not match each other based on the fact that the wireless communication has failed The gist is to further provide.

  By the way, when determining the spreading code, if some abnormality occurs in the in-vehicle device or the portable device and they determine the wrong spreading code, the respective spreading codes determined by the in-vehicle device and the portable device are mutually It will not match. And when such an abnormal situation arises, there exists a possibility that a malfunction may arise in the radio | wireless communication between a vehicle-mounted apparatus and a portable device. In this regard, according to the above configuration, when an abnormal situation occurs in which the spread codes determined by the in-vehicle device and the portable device do not match each other, wireless communication based on spread spectrum modulation fails between them. It is detected that the process has ended, and notification by the notification means is performed. As a result, an operator in the vehicle manufacturing process can be aware of an abnormal situation by this notification, and thus can take necessary measures such as causing the in-vehicle device and the portable device to perform the process of determining the spreading code again. It becomes like this. Therefore, an abnormal situation in which the respective spreading codes determined by the in-vehicle device and the portable device are inconsistent with each other can be suitably avoided, so that normal wireless communication between the in-vehicle device and the portable device can be performed. It will be possible to secure accurately.

  According to a fifth aspect of the present invention, in the electronic key system for a vehicle according to the fourth aspect of the present invention, the electronic key system further includes a registration device used when registering the authentication code in the in-vehicle device or the portable device, and the notification The gist is that the means is provided in the registration device.

According to this configuration, since it is not necessary to newly provide an in-vehicle device or a portable device, the structure of the on-vehicle device or the portable device can be simplified.
According to the sixth aspect of the present invention, an authentication code registered in the in-vehicle device and an authentication registered in the mobile device by transmitting and receiving a radio signal between the in-vehicle device mounted on the vehicle and the portable device. The vehicle-mounted device is allowed to execute various vehicle controls on the condition that the verification codes are matched and it is determined that the authentication codes match each other through the verification, and the vehicle-mounted device and the portable device When transmitting and receiving radio signals to and from the transmitting side, the transmitting side performs spread spectrum modulation processing on the radio signal using the spreading code set on the transmitting side, and the receiving side sets the spreading code set on the receiving side. In an electronic key system for a vehicle that performs a process of demodulating the spread spectrum modulated signal, the authentication code and the spread code are transmitted to the in-vehicle device and the portable device. A registration method for registering the authentication code in the in-vehicle device and the portable device, and the in-vehicle device based on the authentication code registered in the in-vehicle device and the portable device, respectively. The gist of the invention is that the apparatus and the portable device include a spreading code determining step for determining the spreading code.

  According to the setting method of the electronic key system of the vehicle, after passing through the authentication code registration step of registering the authentication code in the in-vehicle device and the portable device, the in-vehicle device and the portable device are diffused based on the registered authentication code. The vehicle electronic key system according to the first aspect of the present invention can be easily realized simply by determining the respective codes.

  According to a seventh aspect of the present invention, in the method for setting the electronic key system for a vehicle according to the sixth aspect, the wireless communication based on the spread spectrum modulation between the in-vehicle device and the portable device after the spreading code determination step. Communication confirmation is performed by notifying means that the spread codes determined by the in-vehicle device and the portable device do not match each other based on the fact that the wireless communication has been failed and detected that the wireless communication has failed The gist is to further include a process.

  According to the setting method of the electronic key system of the vehicle, it is possible to confirm that there is no abnormality in the spreading code determination process if the notification means does not notify in the communication confirmation process. For this reason, if it is known in advance that there is no problem in determining the spreading code even if a problem occurs in the wireless communication between the in-vehicle device and the portable device, the cause of the problem is investigated. It becomes easy to do. In addition, since it is possible to confirm whether or not wireless communication based on spread spectrum modulation can be normally performed in the process of registering the authentication code in the in-vehicle device and the portable device, such communication confirmation process is performed in the vehicle manufacturing process. Compared with the case where it is separately performed as a subsequent process, the number of manufacturing steps of the vehicle can be reduced.

  According to the vehicle electronic key system and the setting method thereof according to the present invention, even when a communication method based on spread spectrum modulation is employed, an increase in the number of manufacturing steps of the vehicle can be avoided while the vehicle-mounted device and the portable device are connected. It is possible to ensure good wireless communication.

The block diagram which shows the system configuration | structure about 1st Embodiment of the electronic key system of the vehicle concerning this invention. (A), (b) is a block diagram which respectively shows those system structures about the transmitter of the portable device of 1st Embodiment, and the receiver of a vehicle-mounted apparatus. The map which shows the relationship between the variable value x each stored in the memory of the vehicle control apparatus of the said 1st Embodiment, and the memory of a portable device control apparatus, and a spreading code. The figure which shows typically an example of the selection method of the spreading code based on a vehicle identification code. The flowchart which shows the process sequence about the spreading | diffusion code selection process by the vehicle control apparatus of 1st Embodiment, and a portable device control apparatus. The sequence chart which shows the process of registering a vehicle identification code and a portable device identification code to an in-vehicle device and a portable device, respectively, for the electronic key system for a vehicle of the first embodiment. The sequence chart which shows the process of registering a vehicle identification code and a portable device identification code with an in-vehicle device and a portable device, respectively, for a second embodiment of the electronic key system for a vehicle according to the present invention. The flowchart which shows the process sequence about the communication confirmation process by the vehicle control apparatus of the said 2nd Embodiment. The figure which shows typically the other example of the selection method of the spreading code based on a vehicle identification code. The top view which shows the outline | summary of an electronic key system typically.

[First Embodiment]
Hereinafter, a first embodiment of a vehicle electronic key system and a setting method thereof according to the present invention will be described 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 with reference to FIG.

As shown in FIG. 1, in this electronic key system, various types of communication control by wireless communication are executed between an in-vehicle device 10 mounted on a vehicle and a portable device 20 carried by the user.
Here, the in-vehicle device 10 includes a first transmission device 11 that transmits a request signal Sre1 to the communication area R1 outside the vehicle, a second transmission device 12 that transmits the request signal Sre2 to the communication area R2 in the vehicle, and a portable device. Receiving devices 13 for receiving the response signal San transmitted from 20 are provided. The in-vehicle device 10 is generally responsible for an engine start switch 14 provided with a switch operation unit 14a that is a part to be pushed by the user when starting the vehicle engine, and for controlling the start of the vehicle engine. An engine starting device 15 is provided. Among these, the engine start switch 14 has an immobilizer amplifier 14c that transmits a drive radio wave Siv to the portable device 20 for a predetermined time and a coil antenna 14b, and is disposed near the steering device in the vehicle interior. Incidentally, the immobilizer amplifier 14 c is also a part that receives the transponder signal Str transmitted from the portable device 20. In addition, the in-vehicle device 10 is provided with a door lock control device 17 that comprehensively controls the locking / unlocking of the vehicle door, and a door courtesy switch 18 that detects an opening / closing operation of the vehicle door. . The transmission control of the request signals Sre1 and Sre2 through the first transmission device 11 and the second transmission device 12, the processing of the response signal San received through the reception device 13, the transmission control of the driving radio wave Siv by the immobilizer amplifier 14c, and the immobilizer amplifier The processing of the transponder signal Str received by 14c is performed through the vehicle control device 16 that is also provided in the in-vehicle device 10. Further, the vehicle control device 16 performs detection processing of opening / closing operation of the vehicle door through the door courtesy switch 18 and detection processing of pressing operation to the switch operation unit 14a, and controls the engine start device 15 and the door lock control device 17. It is also a part to do. Incidentally, the vehicle control device 16 includes a non-volatile memory 16a, and a vehicle identification code IDc unique to the vehicle and a portable device identification code IDk unique to the portable device 20 are stored in the memory 16a. Yes.

  On the other hand, the portable device 20 transmits the response signal San to the in-vehicle device 10 based on the reception of the request signals Sre1 and Sre2 together with the receiving device 21 that receives the request signals Sre1 and Sre2 transmitted from the in-vehicle device 10. A transmission device 22 is provided. The portable device 20 is also provided with the portable device 20 for generating the response signal San based on the request signals Sre1 and Sre2 received through the reception device 21 and controlling the transmission of the generated response signal San through the transmission device 22. This is done through the machine controller 23. Incidentally, the portable device control device 23 also includes a non-volatile memory 23a, and the same identification code as that stored in the memory 16a of the vehicle control device 16 described above, that is, the vehicle, is stored in the memory 23a. An identification code IDc and a portable device identification code IDk are stored. Further, the portable device 20 has a built-in transponder 24 that starts by obtaining a driving power source by receiving the driving radio wave Siv transmitted from the in-vehicle device 10. The transponder 24 is a part that transmits the transponder signal Str to the in-vehicle device 10 when the drive power supply Siv is received and activated by receiving the drive radio wave Siv. Incidentally, the transponder 24 also includes a non-volatile memory 24a, and the portable device identification code IDk is also stored in the memory 24a.

  Incidentally, dedicated registration devices 31 and 32 can be connected to the in-vehicle device 10 and the portable device 20, respectively, and these registration devices 31 and 32 are connected to the in-vehicle device 10 and the portable device 20 respectively to perform a predetermined operation. By doing so, the identification code can be registered in the in-vehicle device 10 and the portable device 20. Specifically, the portable device identification code IDk can be stored in the memory 16a of the vehicle control device 16, or the vehicle identification code IDc can be stored in the memory 23a of the portable device control device 23.

  In the vehicle electronic key system configured as described above, the vehicle control device 16 generates a request signal Sre1 including information such as the vehicle identification code IDc stored in the memory 16a and transmits the request signal Sre1 to the first transmission. It is assumed that the data is transmitted to the outside communication area R1 via the device 11. At this time, if the portable device 20 possessed by the user enters the vehicle exterior communication area R1, the exchange of signals is executed between the in-vehicle device 10 and the portable device 20 in the following manner.

  First, in this system, the request signal Sre1 is received by the receiving device 21 of the portable device 20, and the request signal Sre1 is input to the portable device control device 23. In the portable device control device 23, the vehicle identification code IDc included in the request signal Sre1 is compared with the vehicle identification code IDc stored in the memory 23a. Judge whether or not. When the portable device control device 23 determines that the mutual vehicle identification codes match, the portable device control device 23 determines that the vehicle transmitting the request signal Sre1 is a legitimate vehicle, and transmits the response signal San. I do. That is, the portable device control device 23 generates a response signal San including information such as the portable device identification code IDk stored in the memory 23a, and outputs the response signal San to the transmission device 22, thereby generating the response signal San. It transmits to the said vehicle equipment 10. By transmitting the response signal San in this manner, the receiving device 13 of the in-vehicle device 10 receives the response signal San and outputs the received response signal San to the vehicle control device 16. As a result, the vehicle control device 16 collates the portable device identification code IDk included in the input response signal San with the portable device identification code IDk stored in the memory 16a. It is determined whether or not the identification codes match. When the vehicle control device 16 determines that the portable device identification codes match each other, the vehicle control device 16 determines that the portable device 20 is a regular portable device, and drives the door lock control device 17 to detect the vehicle door. Unlock.

  Next, if the user opens the vehicle door in order to get into the vehicle interior, the vehicle control device 16 detects the door opening operation from the operating state of the door courtesy switch 18, stops transmission of the request signal Sre1, and requests A signal Sre2 is generated and transmitted to the vehicle interior communication area R2 via the second transmitter 12. Incidentally, the request signal Sre2 also includes information such as the vehicle identification code IDc as in the request signal Sre1. When the request signal Sre2 is transmitted to the vehicle interior communication area R2, and the portable device 20 possessed by the user enters the vehicle interior communication area R2, the signal transmission / reception performed in the vehicle exterior communication area R1 is performed. The same signal exchange is performed between the in-vehicle device 10 and the portable device 20. When the vehicle control device 16 determines that the portable device identification codes match each other, the vehicle control device 16 determines that the portable device 20 is a regular portable device and permits the start of the engine. Thereafter, the vehicle control device 16 starts the engine through the engine start device 15 when detecting the pressing operation of the switch operation unit 14a by the user in a state where the start of the engine is permitted.

  On the other hand, in this electronic key system, if the portable device 20 is out of battery, the request signals Sre1 and Sre2 and the response signal San cannot be exchanged, and the vehicle door is unlocked and the engine is started. You will not be able to grant permission. However, when the battery of the portable device 20 runs out, the user can lock / unlock the vehicle door by using a mechanical key (not shown) attached to the portable device 20. The user can perform wireless communication between the in-vehicle device 10 and the portable device 20 by holding the portable device 20 over the engine start switch 14 in the vehicle interior. Allow the engine to start through. Here, if the user holds the portable device 20 over the engine start switch 14, signals are exchanged between the in-vehicle device 10 and the portable device 20 in the following manner.

  First, in this system, if the user unlocks the vehicle door using a mechanical key and then opens the vehicle door in order to get into the vehicle interior, the vehicle control device 16 changes the door state from the operating state of the door courtesy switch 18. Upon detecting the opening operation, the request signal Sre2 is transmitted to the vehicle interior communication area R2, and the driving radio wave Siv is transmitted from the immobilizer amplifier 14c for a predetermined time. Incidentally, since the vehicle control device 16 alternately transmits the request signal Sre2 and the drive radio wave Siv, the request signal Sre2 and the drive radio wave Siv do not interfere with each other. Then, in the portable device 20, when the driving radio wave Siv is received by the transponder 24, the transponder 24 is activated, and the transponder 24 generates a transponder signal Str including the portable device identification code IDk stored in the memory 24a. It transmits to the said vehicle equipment 10. The in-vehicle device 10 receives the transponder signal Str by the immobilizer amplifier 14 c and outputs the received transponder signal Str to the vehicle control device 16. Thereafter, the vehicle control device 16 collates the portable device identification code IDk included in the input transponder signal Str with the portable device identification code IDk stored in the memory 16a, so that the portable device identification codes are identical. Allow the engine to start based on what you are doing. Also at this time, the vehicle control device 16 starts the engine through the engine start device 15 when detecting the pressing operation of the switch operation unit 14a by the user.

  By the way, in such a system that transmits and receives signals through wireless communication, when there is noise (harmful radio waves) that can be received by the receiving device 13 of the in-vehicle device 10 in the communication areas R1 and R2, The influence of noise received together with the response signal San transmitted from the portable device cannot be ignored. That is, there is a possibility that the function required for the electronic key system may be hindered, such as the information included in the response signal San cannot be properly recognized by the in-vehicle device 10.

  Therefore, in the electronic key system according to the present embodiment, a communication system based on spread spectrum modulation is employed as a wireless communication system between the transmission device 22 of the portable device 20 and the reception device 13 of the in-vehicle device 10.

  2 (a) and 2 (b) show the basic configurations of the transmitter 22 of the portable device 20 and the receiver 13 of the in-vehicle device 10, respectively. Next, FIGS. With reference to b), the configuration and operation of the transmitter 22 will be described in detail.

  As shown in FIG. 2A, the transmitter 22 of the portable device 20 includes a modulator 22a that takes in the response signal San output from the portable device control device 23 and performs frequency displacement modulation (FSK modulation). The modulator 22a outputs an FSK-modulated response signal San to the spread modulator 22b. The transmission device 22 is also provided with a spread code generator 22c that applies 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 San 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 diffusion. The transmission device 22 has a structure in which the response signal San that has been subjected to spectrum spread through the spread modulator 22b is transmitted to the in-vehicle device 10 through the antenna 22d.

  On the other hand, as shown in FIG. 2B, the receiving device 13 of the in-vehicle device 10 basically has the transmitting device 22 in response to the spread spectrum response signal San received via the antenna 13a. This is the part that performs the process opposite to the process performed in. That is, the receiving device 13 includes a despreading demodulator 13b that demodulates the response signal San that has been subjected to FSK modulation by multiplying the spread signal provided by the spread code generator 13d by the spread spectrum response signal San. A demodulator 13c that takes in the FSK modulated response signal San and performs FSK demodulation is provided. The receiving device 13 is configured to output the response signal San demodulated in this way to the vehicle control device 16.

  By the way, when the communication method based on the spread spectrum modulation is adopted as the wireless communication method between the transmission device 22 of the portable device 20 and the reception device 13 of the in-vehicle device 10 as described above, the spreading used in the transmission device 22 is performed. It is necessary to synchronize the so-called spreading code that matches the code and the spreading code used in the receiving device 13.

  Therefore, in the vehicle electronic key system according to the present embodiment, the vehicle identification code IDc stored in the memory 16a of the vehicle control device 16 and the vehicle identification code IDc stored in the memory 23a of the portable device control device 23 are used. Paying attention to the fact that the two coincide with each other, the vehicle identification code IDc is used to synchronize the spread codes.

Next, an example of a method of synchronizing the spreading code using the vehicle identification code IDc will be described with reference to FIGS. 3 and 4 together with FIGS. 2 (a) and 2 (b).
First, as shown in FIG. 2 (a), in this embodiment, the spread code generator 22c is configured to be able to give 16 different spread codes A to P to the spread modulator 22b. In addition, one type of spreading code designated by the vehicle control device 16 is provided to the spreading modulator 22b. On the other hand, as shown in FIG. 2 (b), the spread code generator 13d is similarly configured to be able to give different 16 types of spread codes AP to the despread demodulator 13b. At the same time, among the 16 types of spreading codes A to P, one type of spreading code designated by the vehicle control device 16 is provided to the despreading demodulator 13b.

  On the other hand, as shown in FIG. 3, in the memory 16a of the vehicle control device 16 and the memory 23a of the portable device control device 23, the variable value x indicated by an integer value in the range of “0 to 15” and the above 16 types of The same map indicating the relationship with the spreading codes A to P is stored. Then, the vehicle control device 16 and the portable device control device 23 sequentially perform the processing indicated by the following (a1) and (a2) based on this map and the vehicle identification code IDc stored in the respective memories 16a and 23a. A spreading code is selected by performing.

(A1) The lower 4 bits of the vehicle identification code IDc are extracted and converted to a decimal number to perform the calculation process for obtaining the variable value x.
(A2) After obtaining the variable value x, a spreading code is selected by performing a map operation using the map illustrated in FIG. 3 based on the variable value x.

  Specifically, as shown in FIG. 4, for example, the vehicle identification code IDc is configured as a 16-bit binary code “0001 0010 0011 0100”. At this time, the vehicle control device 16 obtains a numerical value “4” by performing a process of converting the lower 4 bits “0100” of the vehicle identification code IDc stored in the memory 16 a into a decimal number, A spread code E is selected by performing a map operation using the map shown in FIG. 3 based on the obtained numerical value. On the other hand, since the vehicle identification code IDc similar to the code illustrated in the figure is also stored in the memory 23a of the portable device control device 23, the portable device control device 23 stores the vehicle identification code stored in the memory 23a. A similar spreading code E is selected by performing similar arithmetic processing and map arithmetic on IDc. As described above, when the vehicle control device 16 and the portable device control device 23 perform the arithmetic processing illustrated in FIG. 4 on the vehicle identification code IDc stored in the respective memories 16a and 23a, the on-vehicle device 10 and the portable device. Thus, the synchronization of each of the 20 spread codes can be naturally achieved.

  In addition, since the vehicle identification code IDc is usually different for each vehicle, for example, if an in-vehicle device mounted on a plurality of vehicles performs the arithmetic processing illustrated in FIG. 4, a variable value x calculated by each in-vehicle device. Are different from each other. For this reason, in each in-vehicle device mounted on a plurality of vehicles, since 16 types of different spreading codes are used separately, even under the situation where the two vehicles mentioned above are close to each other, It becomes possible to reduce the possibility of interference of wireless communication executed by the electronic key system of each vehicle. For this reason, the favorable radio | wireless communication between the vehicle equipment 10 and the portable device 20 can be ensured now.

  FIG. 5 shows the processing procedure for the process of selecting a spread code based on the vehicle identification code IDc, which is executed through the vehicle control device 16 and the portable device control device 23, respectively. Based on the above, the specific procedure of this process will be summarized.

  As shown in FIG. 5, in this process, first, after reading the vehicle identification code IDc stored in the memory 16a of the vehicle control device 16 or the memory 23a of the portable device control device 23 (step S1). The arithmetic processing illustrated in FIG. 4 is executed. That is, after obtaining the variable value x based on the vehicle identification code IDc (step S2), a spreading code is selected by map calculation using the map illustrated in FIG. Step S3). Then, after the information on the selected spreading code is stored in the memory 16a of the vehicle control device 16 or the memory 23a of the portable device control device 23 (step S4), this series of processing is terminated.

  Next, each of the in-vehicle device 10 and the portable device 20 when the spreading code selection process illustrated in FIG. 5 is executed in the step of registering the vehicle identification code IDc and the portable device identification code IDk in the in-vehicle device 10 and the portable device 20, respectively. The manner in which the spreading codes are synchronized will be described with reference to the sequence chart of FIG. It should be noted that at the time before this registration process is executed, only the vehicle identification code IDc is stored in the memory 16a of the vehicle control device 16, and only the portable device identification code IDk is stored in the memory 23a of the portable device control device 23. Has been.

  As shown in FIG. 6, in this registration process, first, the registration devices 31 and 32 are connected to the in-vehicle device 10 and the portable device 20 by an operator, and the connected registration devices 31 and 32 are required. By operating, the in-vehicle device 10 and the portable device 20 are respectively set to the registration processing mode. That is, the vehicle control device 16 is set in a state of accepting registration of the portable device identification code IDk, and the portable device control device 23 is set in a state of accepting registration of the vehicle identification code IDc. Note that when the in-vehicle device 10 and the portable device 20 are set to the registration processing mode, any one of the above 16 types of spreading codes, for example, the same spreading code, for example, to enable wireless communication with each other, for example, Each spreading code A is set to be used, and each spreading code is synchronized.

  Then, after each of the in-vehicle device 10 and the portable device 20 is set to the registration processing mode, when the operator operates the registration device 31 connected to the vehicle side again, the registration processing starts from the registration device 31 to the in-vehicle device 10. When a command is input, a series of registration processes is started. This registration process mainly includes an authentication code registration step of registering the vehicle identification code IDc and the portable device identification code IDk in the vehicle-mounted device 10 and the portable device 20, respectively, and the vehicle-mounted device 10 and the portable device identification code IDc based on the registered vehicle identification code IDc. The portable device 20 includes a spreading code determining step for determining a spreading code.

  Here, in this registration step, first, when the vehicle control device 16 detects the input of the registration process start command, the driving radio wave Siv is transmitted from the immobilizer amplifier 14c for a predetermined time. At this time, when the worker holds the portable device 20 over the engine start switch 14, the portable device 20 receives the driving radio wave Siv by the transponder 24, and the transponder 24 is activated, and the transponder 24 is stored in the memory 24a. A transponder signal Str including the portable device identification code IDk is generated and transmitted to the in-vehicle device 10. In the in-vehicle device 10, the transponder signal Str is received by the immobilizer amplifier 14c, and the vehicle control device 16 stores the portable device identification code IDk included in the received transponder signal Str in the memory 16a.

  Next, the vehicle control device 16 generates a request signal Sre2 including the vehicle identification code IDc stored in the built-in memory 16a, and transmits the generated request signal Sre2 to the vehicle interior communication area R2. Then, in the portable device 20, the request signal Sre2 is received by the receiving device 21, and the portable device control device 23 stores the vehicle identification code IDc included in the request signal Sre2 in the memory 23a. Then, through the series of registration steps so far, the same vehicle identification code IDc and the same portable device identification code IDk are registered in the in-vehicle device 10 and the portable device 20, respectively. Thereafter, the portable device control device 23 generates a response signal San including information indicating that the vehicle identification code IDc has been successfully registered, and transmits this to the in-vehicle device 10.

  Thereafter, the portable device control device 23 generates a response signal San including information indicating that the vehicle identification code IDc has been successfully registered and transmits the response signal San to the in-vehicle device 10, as illustrated in FIG. 5 above. Execute the process. On the other hand, when the in-vehicle device 10 receives this response signal San by the receiving device 13, it detects that the portable device 20 has successfully registered the vehicle identification code IDc based on the information included in the response signal San. Then, the process illustrated in FIG. 5 is executed. At this time, the vehicle identification code IDc stored in the memory 16a of the vehicle control device 16 and the vehicle identification code IDc stored in the memory 23a of the portable device control device 23 coincide with each other. And the portable device 20 selects the same spreading code. That is, the spread codes of the in-vehicle device 10 and the portable device 20 can be automatically synchronized. As a result, it is not necessary to newly provide a step of synchronizing the respective spread codes of the in-vehicle device 10 and the portable device 20 in the vehicle manufacturing process, so that the number of vehicle manufacturing steps can be reduced.

  By the way, in the conventional system including the electronic key system according to the present embodiment, the registration information such as the vehicle identification code IDc and the spread code disappears when some trouble occurs in the in-vehicle device 10 or the portable device 20, for example. For this reason, for example, it is desirable that the dealer can set the spreading code in the in-vehicle device 10 or the portable device 20 again. Here, as described above, when a plurality of types of spreading codes are prepared in advance and a plurality of types of spreading codes are assigned to each vehicle at the time of vehicle manufacture, the dealer assigns the spreading code assigned to each vehicle. For example, the spreading code assigned to each vehicle needs to be stored and managed in a predetermined database so that it can be identified later. However, in this case, since the number of spreading codes increases in proportion to the number of vehicles, the database management may become complicated. In addition, when the dealer sets the spreading code in the in-vehicle device 10 or the portable device 20 again, the dealer reads the spreading code corresponding to each vehicle from the database, or reads the read spreading code into the in-vehicle device 10 and the portable device 20, respectively. There is a need to perform registration and the like, and the procedure for setting the spreading code again may be complicated.

  In this regard, in the vehicle electronic key system according to the present embodiment, since the vehicle identification code IDc and the portable device identification code IDk are respectively registered in the in-vehicle device 10 and the portable device 20, the spreading code can be set naturally. It is not necessary to store the codes in the database and manage them, so that the management work of the dealer can be reduced. The dealer also registers the vehicle identification code IDc and the portable device identification code IDk in the vehicle-mounted device 10 and the portable device 20 respectively when the spreading code is set again in the vehicle-mounted device 10 and the portable device 20, that is, conventional registration. The spreading code can be registered again in the in-vehicle device 10 or the portable device 20 simply by performing the work. For this reason, it becomes possible to avoid the complexity of the procedure for setting the spreading code again.

As described above, according to the vehicle electronic key system and the setting method thereof according to the present embodiment, the following effects can be obtained.
(1) The vehicle control device 16 and the portable device control device 23 are configured so that the in-vehicle device 10 and the portable device 20 select and use any one of the 16 different spread codes. The spreading code is selected based on the vehicle identification code IDc registered in each. Thereby, since it becomes possible to naturally synchronize the spread codes of the in-vehicle device 10 and the portable device 20 in the vehicle manufacturing process, it is possible to reduce the number of manufacturing steps of the vehicle. In addition, since each of the in-vehicle devices mounted on a plurality of vehicles uses 16 different types of spreading codes, the electronic devices of each vehicle can be used even when two vehicles are close to each other. It becomes possible to reduce the possibility of interference of wireless communication performed by the key system. Therefore, good wireless communication between the in-vehicle device 10 and the portable device 20 can be ensured. Furthermore, since the dealer does not need to store and manage the spreading code in a predetermined database or the like in preparation for the situation where the spreading code is set again in the in-vehicle device 10 or the portable device 20, the management work of the dealer can be reduced. It will be possible to plan. In addition, the dealer does not need to read the spreading code corresponding to each vehicle from the database when setting the spreading code in the in-vehicle device 10 or the portable device 20 again. It becomes possible to avoid complication.

(2) By storing the same map showing the relationship between 16 different spreading codes and variable value x in the vehicle control device 16 and the portable device control device 23, the vehicle identification code IDc is subjected to arithmetic processing. After obtaining the variable value x, a spreading code is selected by performing a map operation based on the obtained variable value x. Thus, even if the vehicle identification code IDc and the spreading code are not similar to each other, the vehicle control device 16 and the portable device control device 23 perform the above-described calculation based on the vehicle identification code IDc registered in each. A spreading code can be determined simply by performing processing and map calculation. For this reason, it becomes possible to easily determine the spread code based on the vehicle identification code IDc.
[Second Embodiment]
Next, a second embodiment of the vehicle electronic key system and its setting method 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 shown in FIGS. 1 and 2, and the registration process is shown in FIG. 7 as a diagram corresponding to FIG. It shows. In the following description, 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 described above, if the spreading code is determined based on the vehicle identification code IDc, basically, the spreading codes respectively determined by the in-vehicle device 10 and the portable device 20 coincide with each other. However, when the in-vehicle device 10 and the portable device 20 execute the spreading code selection process illustrated in FIG. 6 above, if any abnormality occurs and they determine an incorrect spreading code, the in-vehicle device 10 and the portable device 20 The spreading codes determined by the machine 20 do not match each other. And when such an abnormal situation arises, there exists a possibility that a malfunction may arise in the radio | wireless communication between the vehicle-mounted apparatus 10 and the portable device 20. FIG.

  So, in this embodiment, after performing the said spreading code selection process with the vehicle equipment 10 and the portable device 20, the wireless communication based on spread spectrum modulation is actually performed between the vehicle equipment 10 and the portable device 20, A communication confirmation step for confirming whether or not wireless communication can be normally performed is provided. In addition, as shown in FIG. 1 above, after providing the issuance diode (LED) 31a in the registration device 31 connected to the in-vehicle device 10, the communication that the wireless communication based on the spread spectrum modulation has failed is communicated. When it is detected in the confirmation process, the LED 31a is turned on to notify the operator of that fact. Incidentally, by providing the registration device 31 with the LED 31a that is a notification means, for example, it is not necessary to newly provide a notification means in the in-vehicle device 10 or the portable device 20, so the structure of the in-vehicle device 10 or the portable device 20 is simplified. Will be able to.

FIG. 7 shows the registration process as a sequence chart as described above.
As shown in FIG. 7, in this communication confirmation step, after the spread code selection process is executed by the in-vehicle device 10, the vehicle control device 16 generates a communication confirmation request signal Scd and outputs it to the vehicle. It transmits to indoor communication area R2.

  Then, in the portable device 20, the communication confirmation request signal Scd is received by the receiving device 21, and the communication confirmation request signal Scd is input to the portable device control device 23. When the communication confirmation request signal Scd is input in this way, the portable device control device 23 generates a communication confirmation response signal Sca and outputs it to the transmission device 22. At this time, the transmission device 22 performs a process for performing spread spectrum modulation on the communication confirmation response signal Sca based on the spread code determined by the portable device 20, and transmits the spread spectrum modulated communication confirmation response signal Sca to the in-vehicle device 10. Send to.

  Subsequently, the in-vehicle device 10 receives the spread spectrum modulated communication confirmation response signal Sca by the receiving device 13, and the receiving device 13 receives the communication confirmation response signal Sca based on the spread code determined by the in-vehicle device 10. Is demodulated, and the demodulated communication confirmation response signal Sca is output to the vehicle control device 16. When the communication confirmation response signal Sca is input in this manner, the vehicle control device 16 determines that normal wireless communication with the portable device 20 has been performed, and sends a normal reception notification signal Snr indicating that to the vehicle control device 16. It transmits to indoor communication area R2, and a series of registration processes are complete | finished.

  On the other hand, in the portable device 20, when the normal reception notification signal Snr is received by the reception device 21 and the received normal reception notification signal Snr is input to the portable device control device 23, the portable device control device 23 receives the in-vehicle device. 10, it is determined that normal wireless communication has been performed, and the series of registration processing is terminated.

  By the way, as described above, if an abnormal situation occurs in which the spread codes determined by the in-vehicle device 10 and the portable device 20 are inconsistent with each other, the communication confirmation response signal Sca transmitted from the portable device 20 is transmitted to the in-vehicle device. The device 10 cannot receive. Thus, in the present embodiment, if the communication confirmation response signal Sca cannot be received even after a predetermined time has elapsed after the in-vehicle device 10 transmits the communication confirmation request signal Scd, it indicates that an abnormal situation has occurred. I am trying to inform you. Specifically, the vehicle control device 16 sends an LED lighting command to the registration device 31 to turn on the LED 31a so as to notify the abnormal situation. As a result, it is possible to notify the worker that the respective spreading codes determined by the in-vehicle device 10 and the portable device 20 do not match each other.

  FIG. 8 shows a processing procedure for processing for confirming communication with the portable device 20 based on transmission / reception of the communication confirmation request signal Scd and the communication confirmation response signal Sca, which is executed through the vehicle control device 16. Next, the specific procedure of the process will be summarized based on FIG.

  As shown in FIG. 8, in this process, first, the communication confirmation request signal Scd is transmitted to the vehicle interior communication area R2 (step S10), and then a predetermined time has elapsed since the communication confirmation request signal Scd was transmitted. It is determined whether or not it has elapsed (step S11). Specifically, the elapsed time from the time when the communication confirmation request signal Scd is transmitted through the internal timer of the vehicle control device 16 is measured, and the communication confirmation request is made based on the fact that this elapsed time has reached a predetermined time or more. It is determined that a predetermined time has elapsed since the signal Scd was transmitted. At this time, whether or not the communication confirmation response signal Sca has been received in step S12 is also monitored. If the predetermined time has not elapsed since the transmission of the communication confirmation request signal Scd (step S11: NO), and the communication confirmation response signal Sca can be received during that period (step S12: YES), that is, when it is detected that normal wireless communication with the portable device 20 has been performed, the normal reception notification signal Snr is transmitted to the vehicle interior communication area R2 (step S13), and vehicle control is performed. The device 16 ends this series of processing.

  On the other hand, when the communication confirmation response signal Sca cannot be received (step S12: NO) and a predetermined time has elapsed since the communication confirmation request signal Scd was transmitted (step S11: YES), that is, the portable device When it is detected that the wireless communication with 20 has failed, an LED lighting command is transmitted to the registration device 31 (step S14), and the vehicle control device 16 ends this series of processing.

  According to such a configuration as the electronic key system of the vehicle, the LED 31a of the registration device 31 is lit when an abnormal situation occurs in which the spreading codes determined by the in-vehicle device 10 and the portable device 20 are not consistent with each other. By doing so, the abnormal situation is notified. As a result, the worker in the vehicle manufacturing process can be aware of the abnormal situation by this notification, so that the necessary measures can be taken, for example, the registration process illustrated in FIG. 7 is performed again. Therefore, an abnormal situation in which the respective spreading codes determined by the in-vehicle device 10 and the portable device 20 are inconsistent with each other can be preferably avoided. Wireless communication can be ensured accurately.

  In the vehicle manufacturing process, if the LED 31a is not turned on, it can be confirmed that there is no abnormality in the above-described spreading code determination process. For this reason, even if there is a problem in the wireless communication between the in-vehicle device 10 and the portable device 20 afterwards, if it is known in advance that there is no problem in determining the spreading code, the cause of the problem It becomes easy to investigate. In addition, since it is possible to confirm whether or not wireless communication based on spread spectrum modulation can be normally performed in a series of registration processes, compared with a case where the communication confirmation process is separately performed as a subsequent process of the vehicle manufacturing process. Thus, it becomes possible to reduce the number of manufacturing steps of the vehicle.

  As described above, the electronic key system according to the present embodiment and the setting method thereof also have effects equivalent to or equivalent to the effects (1) and (2) of the first embodiment. In addition, the following effects can be obtained.

  (3) The wireless communication based on the spread spectrum modulation is performed between the in-vehicle device 10 and the portable device 20, and the LED 31a of the registration device 31 is turned on when it is detected that the wireless communication has failed. I tried to make it. As a result, an operator can be aware of an abnormal situation in which the spreading codes determined by the in-vehicle device 10 and the portable device 20 are inconsistent with each other, and can take necessary measures. It is possible to accurately ensure normal wireless communication between the devices 20.

  (4) The notification means for notifying that the spreading codes determined by the in-vehicle device 10 and the portable device 20 do not match each other is realized by the LED 31a provided in the registration device 31. Thereby, since it becomes unnecessary to provide a notification means in the vehicle-mounted apparatus 10 or the portable device 20, the structure of the vehicle-mounted device 10 or the portable device 20 can be simplified.

(5) In the electronic key system registration process, the communication confirmation process is performed after the spreading code determination process. As a result, it is possible to confirm that there is no abnormality in the spreading code determination process. Therefore, even if a problem occurs in the wireless communication between the in-vehicle device 10 and the portable device 20 later, the spreading code If it is known in advance that there is no problem in the determination of the code, it becomes easy to investigate the cause of the malfunction. In addition, since communication confirmation can be performed in a series of registration processes, compared with a case where the communication confirmation process is separately performed as a subsequent process of the vehicle manufacturing process, the number of manufacturing steps of the vehicle can be reduced.
[Other Embodiments]
In addition, each said embodiment can also be implemented with the following forms which changed this suitably.

  In the second embodiment, the notification that the wireless communication based on the spread spectrum modulation has failed is performed by turning on the LED 31a of the registration device 31. Instead of this, for example, a buzzer or a horn mounted on the vehicle may be sounded or a warning light may be turned on on the instrument panel. Further, for example, the notification may be performed using a display device mounted on the portable device 20, specifically, a liquid crystal display, an LED, or the like. In short, what is necessary is just to be able to notify that the spreading codes determined by the in-vehicle device 10 and the portable device 20 do not match each other.

  As a method of selecting one type of spreading code by obtaining a variable value x by performing a predetermined computation process on the vehicle identification code IDc and then performing a map computation based on the obtained variable value x, You may employ | adopt the method shown by (b1) and (b2).

  (B1) After the entire bit string of the vehicle identification code IDc is converted into a decimal value, an arithmetic process is performed to convert the converted value into a variable value x in the range of “0 to 15” using a predetermined hash function.

(B2) After obtaining the variable value x, a spread code is selected by performing a map operation using the map illustrated in FIG. 3 based on the variable value x.
Specifically, as shown in FIG. 9, for example, it is assumed that the vehicle identification code IDc is configured as a 16-bit binary code “0001 0010 0011 0100”. At this time, the vehicle control device 16 and the portable device control device 23 perform an arithmetic process of converting the vehicle identification code IDc stored in the built-in memories 16a and 23a into a decimal number, thereby adjusting the number “4660”. Find each number. Further, the vehicle control device 16 and the portable device control device 23 obtain a numerical value “4” by converting the integer value “4660” thus obtained by a hash function, and then based on the obtained numerical value, The spread code E is selected by performing map calculation using the map illustrated in FIG. Even with this method, it is possible to select a spreading code. In short, after a predetermined calculation process is performed on the vehicle identification code IDc to obtain a variable value x, a spread code is selected by a map calculation using the map illustrated in FIG. 3 based on the obtained variable value x. Anything to do.

  In each of the above embodiments, the response signal San is FSK modulated in the transmission device 22 of the portable device 20, but instead, for example, the response signal San is amplitude-shift-modulated (in the transmission device 22 of the portable device 20). ASK modulation) or phase shift keying (PSK modulation) may be performed. In addition to this, the response signal San may be ASK demodulated or PSK demodulated in the receiving device 13 of the in-vehicle device 10.

  In each of the above embodiments, the in-vehicle device 10 and the portable device 20 each use any one of the 16 types of spreading codes when set to the registration processing mode. Instead, for example, during the period when the in-vehicle device 10 and the portable device 20 are set to the registration processing mode, the function of the spread modulation by the spread modulator 22b of the portable device 20 and the inverse by the despreading demodulator 13b of the in-vehicle device 10 are used. The function of spread demodulation may be temporarily stopped.

  In each of the above embodiments, the receiving device 13 of the in-vehicle device 10 and the transmitting device 22 of the portable device 20 are each configured to be able to set 16 different types of spreading codes AP, but this Instead, for example, 17 or more types, or 2 to 15 types of spreading codes may be set.

  In each of the above embodiments, a communication method based on spread spectrum modulation is adopted as a wireless communication method between the transmission device 22 of the portable device 20 and the reception device 13 of the in-vehicle device 10. In addition to this, for example, when the influence of noise that can be received by the receiving device 21 of the portable device 20 is also concerned, the first and second transmitting devices 11 and 12 of the in-vehicle device 10 and the receiving device 21 of the portable device 20 A communication system based on spread spectrum modulation may be adopted as a wireless communication system between the two. Alternatively, a communication system based on spread spectrum modulation may be adopted only for a wireless communication system between them. When a communication system based on spread spectrum modulation is adopted as a wireless communication system between them, for example, when the registration process illustrated in FIG. 7 is performed, the portable device 20 transmits a communication confirmation request signal Scd. It is effective to perform a predetermined notification when it is not possible to receive the message. By performing such notification, it becomes possible to confirm whether or not radio communication based on spread spectrum modulation can be normally performed between them.

  In each of the above embodiments, as a method for determining the spreading code from the vehicle identification code IDc, after calculating the variable value x by performing arithmetic processing on the vehicle identification code IDc, FIG. 3 shows the variable value x based on the obtained variable value x. A method of selecting a spreading code by map calculation using the illustrated map was adopted. The method for determining the spread code from the vehicle identification code IDc may be any method that uniquely determines one spread code from one vehicle identification code IDc. However, it is not necessary to be able to specify the vehicle identification code IDc from the spread code.

In each of the above embodiments, the spread code is selected based on the vehicle identification code IDc among the vehicle identification code IDc and the portable device identification code IDk used as the authentication code. Instead of this, the spread code may be selected based on the portable device identification code IDk. In short, any configuration may be used as long as the spread code is selected based on a common authentication code that each of the in-vehicle device 10 and the portable device 20 has.
(Appendix)
Next, a technical idea that can be grasped from the above embodiment and its modifications will be additionally described.

  (A) In the electronic key system for a vehicle according to claim 2, after the predetermined calculation process extracts a part of the bit string constituting the vehicle identification code, the part of the extracted bit string is converted to a decimal number. An electronic key system for a vehicle, which is a calculation process for obtaining a variable value for designating the plurality of types of spreading codes by converting to a numerical value. According to this configuration, even if the vehicle identification code and the variable values for designating the plurality of types of spreading codes do not match each other, the plurality of types of spreading codes are designated from the vehicle identification code. Therefore, the map operation described above can be performed very easily.

  (B) In the vehicle electronic key system according to claim 2, after the predetermined calculation process converts the entire bit string constituting the vehicle identification code into a decimal number, the converted value is converted into a hash function. An electronic key system for a vehicle, wherein the electronic key system is a calculation process for converting the plurality of types of spreading codes into variable values that designate the spread codes. According to this configuration, even if the vehicle identification code and the variable values for designating the plurality of types of spreading codes do not match each other, the plurality of types of spreading codes are designated from the vehicle identification code. Therefore, it is possible to determine the variable value for the above-mentioned reasonably easily, and as a result, the above-described map calculation can be performed very easily.

  San ... Response signal, Sca ... Communication confirmation response signal, Scd ... Communication confirmation request signal, Snr ... Normal reception notification signal, Siv ... Drive radio wave, Str ... Transponder signal, Sre1, Sre2 ... Request signal, 10 ... In-vehicle device, 11, DESCRIPTION OF SYMBOLS 12, 22 ... Transmitter, 13, 21 ... Receiver, 13a, 22d ... Antenna, 13b ... Despreading demodulator, 13c ... Demodulator, 13d, 22c ... Spreading code generator, 14 ... Engine start switch, 14a ... Switch Operation part, 14b ... Coil antenna, 14c ... Immobilizer amplifier, 15 ... Engine starting device, 16 ... Vehicle control device, 16a, 23a, 24a ... Memory, 17 ... Door lock control device, 18 ... Door courtesy switch, 20 ... Portable machine, 22a ... modulator, 22b ... diffusion modulator, 23 ... portable device control device, 24 ... transponder, 1,32 ... registration device, 31a ... emitting diode (LED).

Claims (7)

An authentication code registered in the in-vehicle device and an authentication code registered in the mobile device are verified by transmitting and receiving a radio signal between the in-vehicle device mounted on the vehicle and the portable device, and the verification Execution of various vehicle controls by the in-vehicle device is permitted on the condition that it is determined that the authentication codes of each other match, and wireless signals are transmitted and received between the in-vehicle device and the portable device At the transmission side, the wireless signal is subjected to spread spectrum modulation processing using a spread code set on the transmission side, and on the reception side, the spread spectrum modulation is performed using the spread code set on the reception side. In an electronic key system for a vehicle that performs processing for demodulating a signal,
The vehicle-mounted device and the portable device each determine the spreading code based on the registered authentication code. The in-vehicle device and the portable device each have the same map indicating the relationship between a variable value obtained by performing a predetermined calculation process on the authentication code and a plurality of types of spreading codes specified by the variable value. The determination of the spreading code based on the authentication code is performed by performing a predetermined calculation process on the authentication code to obtain the variable value, and then performing the spreading by map operation using the map based on the obtained variable value. The vehicle electronic key system according to claim 1, wherein the electronic key system is performed by selecting a code. The authentication code includes a vehicle identification code set for each vehicle in order to identify a plurality of vehicles from each other, and the determination of the spreading code based on the authentication code is based on the spreading code based on the vehicle identification code. The vehicle electronic key system according to claim 1, wherein the electronic key system is performed as a decision. The vehicle electronic key system according to any one of claims 1 to 3,
When the wireless communication based on the spread spectrum modulation is performed between the in-vehicle device and the portable device, it is detected that the wireless communication has failed, and the in-vehicle device and the portable device An electronic key system for a vehicle, further comprising notification means for notifying that the determined spreading codes do not match each other. The electronic key system for a vehicle according to claim 4,
An electronic key system for a vehicle, further comprising a registration device used when registering the authentication code in the in-vehicle device or the portable device, wherein the notification means is provided in the registration device. An authentication code registered in the in-vehicle device and an authentication code registered in the mobile device are verified by transmitting and receiving a radio signal between the in-vehicle device mounted on the vehicle and the portable device, and the verification Execution of various vehicle controls by the in-vehicle device is permitted on the condition that it is determined that the authentication codes of each other match, and wireless signals are transmitted and received between the in-vehicle device and the portable device At the transmission side, the wireless signal is subjected to spread spectrum modulation processing using a spread code set on the transmission side, and on the reception side, the spread spectrum modulation is performed using the spread code set on the reception side. In an electronic key system for a vehicle that performs a process of demodulating a signal, the authentication code and the spread code are registered in the in-vehicle device and the portable device, respectively. There is provided a method,
An authentication code registration step of registering the authentication code in the in-vehicle device and the portable device,
A spreading code determining step in which the in-vehicle device and the portable device respectively determine the spreading code based on authentication codes registered in the in-vehicle device and the portable device;
A method for setting an electronic key system for a vehicle comprising: In the setting method of the electronic key system of vehicles according to claim 6,
The in-vehicle device is configured to perform wireless communication based on the spread spectrum modulation between the in-vehicle device and the portable device after the spreading code determination step and detect that the wireless communication has failed. And a communication confirmation step of notifying through the notification means that the respective spreading codes determined by the portable device do not match each other.

Images