JP4714085B2 - Receiver and remote control device - Google Patents

Description

  The present invention relates to a receiver and a remote control device.

  Conventionally, when a user carries a portable device as an electronic key and approaches or separates from the vehicle, an electronic key system for a vehicle that unlocks or locks a door through mutual wireless communication between the portable device and the vehicle has been proposed. (For example, refer to Patent Document 1). The electronic key system for a vehicle includes a plurality of transmission antennas provided on door handle knobs of a driver seat side door, a passenger seat side door, a rear seat right door, and a rear seat left door. By transmitting a response request signal through the driver seat side door, the passenger seat side door, the rear seat right door, and the rear seat left door, a detection area of the portable device is formed. When the user carries the portable device and approaches the vehicle and enters the detection area, the portable device receives the response request signal and returns a response signal including a predetermined identification code. When the returned response signal is received via a receiving antenna provided in the vehicle interior, the vehicle control device determines the validity of the predetermined identification code included in the received response signal and When it is determined that there is, the vehicle door is electronically unlocked or unlocked.

  Next, mutual wireless communication between the portable device and the vehicle will be described in detail. That is, as shown in FIG. 4, the vehicle control device forms a detection area of the portable device by transmitting an activation signal Swake including a WAKE code for activating the portable device as the response signal through the transmission antenna. To do. Then, when the user carries the portable device and enters the detection area, when the portable device receives the activation signal Swake transmitted through the transmission antenna of the vehicle, the portable device first includes the WAKE included in the activation signal Swake. Determine the validity of the code, that is, whether it is a regular signal pattern. Next, the portable device waits for the operation of the built-in control IC to stabilize, and returns an ACK signal Sack, which is a response signal indicating that it has been recognized normally, to the vehicle side. When there are a plurality of portable devices such as a master and a spare in the detection area, an ACK signal Sack is returned from each to the vehicle side.

  By receiving the ACK signal Sack, the vehicle control device determines that the portable device is within the detection area and transmits a vehicle identification signal Scar including its own vehicle code. When the portable device receives the vehicle identification signal Scar, the portable device collates the vehicle code included in the portable device with the vehicle code registered in the portable device. If the matching is established, the portable device again sends the ACK signal Sack to the vehicle side. Reply to When there are a plurality of portable devices such as a master and a spare in the detection area, an ACK signal Sack is returned from each to the vehicle side.

  When the control device for the vehicle receives the ACK signal Sack again, it transmits an authentication signal Sran including the key code. At this time, a plurality of types of key codes are registered on the vehicle side in order to support a spare portable device, and an authentication signal Sran including the registered key codes is sequentially transmitted from the vehicle side. For example, as shown in FIG. 4, an authentication signal Sran corresponding to the master portable device 12 is transmitted, and thereafter, an authentication signal Sran corresponding to the spare portable device 12 is sequentially transmitted.

  When the portable device receives this authentication signal Sran, the portable device collates the key code included in the portable device with the key code registered in itself, and if the collation is established, the key code of the portable device is registered in the vehicle. It is determined that the code is correct. Then, the portable device returns an identification signal Sid including its own identification code to the vehicle side. When receiving the identification signal Sid, the vehicle control device collates the identification code included in the identification signal Sid with the identification code registered in the vehicle. It is determined that the mobile device is registered in. The vehicle control device permits the door lock to be unlocked or unlocked.

  Here, the ACK signal Sack is a common signal having the same signal pattern in the master portable device and the spare portable device. For this reason, there is no problem when the master and spare portable devices simultaneously receive the activation signal Swake and simultaneously return the ACK signal Sack. That is, the two ACK signals Sack sent back simultaneously are combined by the vehicle control device and recognized as a single ACK signal Sack. At this time, as long as the return timing of the ACK signal Sack is the same, the signal pattern of the synthesized ACK signal Sack recognized by the vehicle control device is that of the individual ACK signal Sack returned from the master and spare portable devices. Since it coincides with the signal pattern, the vehicle control device can clearly recognize the synthesized ACK signal Sack.

  However, actually, as shown in FIG. 5, the WAKE code determination time t1 and the WAKE code from when the activation signal Swake is received from the vehicle until the determination of the validity of the WAKE code included in the signal is completed. The operation stabilization time t2 from the completion of the validity determination to the stabilization of the operation of the control IC varies between the master and spare portable devices. Due to this, when the master and spare portable devices simultaneously receive the activation signal Swake, the return timing of the ACK signal Sack also varies between the two.

  The ACK signals Sack from the two portable devices that are shifted from each other in time are combined and recognized as one signal by the vehicle control device. At this time, a bit error (here, so-called bit collapse) may occur. As shown in FIG. 5, when the pattern of the ACK signal Sack is composed of, for example, a first bit Bit1 (Hi), a second bit Bit2 (Lo), and a third bit Bit3 (Hi), The ACK signal Sack from the portable device is synthesized and recognized by the vehicle control device in the following manner.

  That is, the first bit Bit1 of the ACK signal Sack received earlier and the first bit Bit1 of the ACK signal Sack received later are combined so that they are just superimposed, and the width of the first bit Bit1 is It becomes longer (in time) than the original bit width. Further, the third bit Bit3 of the ACK signal Sack received earlier and the third bit Bit3 of the ACK signal Sack received later are combined so that the width of the third bit Bit3 is originally It becomes longer (in time) than the bit width of.

  As a result, the bit width of the second bit Bit2 secured between the front end of the third bit Bit3 of the ACK signal Sack received earlier and the rear end of the first bit Bit1 of the ACK signal Sack received later. Will be slight. That is, in this case, the second bit Bit2 is almost crushed, and the vehicle control device may not be able to recognize the second bit Bit2 and thus the synthesized ACK signal Sack.

Therefore, in order to suppress the occurrence of the so-called bit collapse of the ACK signal Sack, the applicant of the present application uses a bit format in which each bit width of the ACK signal Sack is longer than the conventional one, as shown in FIG. I am thinking of adopting it. In this way, when the master and spare portable devices simultaneously receive the activation signal Swake, the return timing of the ACK signal Sack from both due to variations in the WAKE code determination time t1 and the operation stabilization time t2. Even if there is a slight shift, the bit width of the second bit Bit2 when the two ACK signals Sack are combined is ensured to some extent. For this reason, the vehicle control apparatus can recognize the synthesized ACK signal Sack.
JP 2000-104429 A JP 2001-241227 A

  However, in the electronic key system, the bit format of the ACK signal Sack is changed to the conventional one in order to suppress the occurrence of bit collapse when there is a reply of the ACK signal Sack from a plurality of portable devices such as a master key and a spare key. Due to the design longer than the electronic key system, the following were concerned. That is, the ACK signal Sack and the identification signal Sid are both received by the same receiver mounted on the vehicle. The received signals are demodulated by a demodulation circuit, and noise is removed from the demodulated signals by a filter. Here, since the (frequency) pass band of the filter is single, it is necessary to set the ACK signal Sack and the identification signal Sid transmitted from the portable device to the same bit format.

  That is, as described above, when the bit format of the ACK signal Sack is set to be longer than the conventional one, it is necessary to set the bit format of the identification signal Sid to be longer than the conventional one. There is a possibility that the total communication time between the portable device and the vehicle is increased by the length of the bit format of the signal Sack and the identification signal Sid. An increase in the communication time between the portable device and the vehicle is an obstacle to smooth unlocking or unlocking of the door of the vehicle. Therefore, an improvement in this respect has been desired. In addition, in recent years, an electronic key system as described above, for example, applied to a door of a house is also known (for example, see Patent Document 2). Even in this case, there were concerns about the same problems as described above.

  The present invention has been made to solve the above problems, and its purpose is to ensure communication reliability while suppressing an increase in communication time between the portable device possessed by the user and the object to be remotely controlled. It is to provide a receiver and a remote control device that can be used.

The invention according to claim 1 is generated from a portable device possessed by a user in response to a response request signal generated by a remote control target control device and transmitted through a transmitter provided on the remote control target side. An antenna that receives a modulated response signal that is transmitted, a demodulation circuit that demodulates the response signal received through the antenna, a filter that removes noise included in the response signal demodulated by the demodulation circuit, and the filter And a comparator for converting the demodulated response signal from which noise has been removed by the digital signal to the digital signal output from the comparator to the control device. The response signal is obtained when the response request signal for each of the plurality of portable devices corresponding to the remote control target is normally received. When a response signal common to each portable device transmitted from each portable device and a response request signal for a specific portable device among a plurality of portable devices corresponding to the remote control target are normally received Response signals unique to each portable device transmitted from a specific portable device, and these common response signals and unique response signals are a series of signals for causing the remote control target to perform a specific function. Among these signals, the common response signal adopts a signal format longer than at least the signal width of the specific response signal, and the filter includes the common response signal and the specific response signal. The first and second filters having different passbands corresponding to the response signal are configured, and the second filter is set to have a higher passband than the first filter, and Provided with a first and second changeover switch for switching on the basis of the filter switching signal from the control unit of the remote control target, the change-over switch, at the timing of receiving the response signal of Generic Trunking in the series of signals the first The gist of the present invention is to switch to the second filter at the timing of receiving the unique response signal in the series of signals .

  According to the present invention, the common response signal transmitted from the portable device adopts a signal format longer than at least the signal width of the unique response signal transmitted from the portable device. For this reason, even when the response timings of common response signals from a plurality of portable devices are slightly shifted, and the response signals are combined and received so as to be superimposed, the occurrence of bit errors is suppressed. That is, the difference in response timing of the common response signal from each portable device is absorbed by the length of the signal format of each common response signal. Therefore, when each common response signal is combined and received, the signal width of the combined signal is ensured, so that the control device to be remotely controlled can output the combined common response signal. It becomes possible to recognize.

  Here, in the response signal unique to each portable device, unlike the response signal common to each portable device, it is not necessary to lengthen the signal format to suppress the occurrence of bit errors. This is because a unique response signal is different from a common response signal and responds to a response request signal for a specific portable device, so it is not transmitted simultaneously from a plurality of portable devices, This is because the remote control target control device is not recognized in the synthesized state.

  In the present invention, as described above, the signal format of the specific response signal is set to be shorter than the signal format of the common response signal, and the first filter corresponding to the common response signal and the specific response signal A second filter corresponding to the response signal is provided. Then, the pass band of the filter, that is, the bit rate of the signal is switched according to the signal to be processed (common response signal and unique response signal). Specifically, when processing a common response signal, it is switched to the first filter, and when processing a unique response signal, it is switched to the second filter.

  For this reason, unlike the case where a filter having only a single pass band is provided, it is not necessary for the common response signal and the unique response signal to have the same signal format for processing by the filter. The unique response signal is processed by a second filter having a signal rate, that is, a processing speed higher than that of the first filter. For this reason, unlike the case where the unique response signal is processed at the same signal rate as the common response signal, the total communication time between the portable device and the remote control target can be shortened. Furthermore, the communication time between the portable device and the remote control target is shortened by the amount that the signal format of the unique response signal is at least shorter than the signal format of the common response signal.

  As described above, by suppressing the bit error of the response signal common to each portable device, while ensuring the reliability for communication, the processing speed of the response signal unique to each portable device is increased to The total communication time with the remote control object can be shortened.

  According to a second aspect of the present invention, in the receiver according to the first aspect, the change-over switch waits for reception in a state in which the change-over switch is switched in advance to a filter corresponding to a response signal transmitted from the portable device. This is the gist.

  According to the present invention, the switch is switch-controlled by the remote control target control device. And since the control apparatus of remote control object has produced | generated the response request signal with respect to a portable device, it can judge which signal will be transmitted from a portable device next. For this reason, in the remote control target control device, it is possible to switch in advance to the first filter or the second filter corresponding to the next signal sent from the portable device. For this reason, it is not necessary to include information for determining the signal rate in the response signal common to each portable device and the response signal unique to the portable device. Then, the signal length of the common response signal and the specific response signal is shortened by the amount that the information for determining the signal rate is unnecessary, and the communication time between the portable device and the remote control target is shortened accordingly. Can be shortened.

The gist of the invention described in claim 3 is the receiver according to claim 1 or 2, wherein the remote control object is a vehicle or a building.
According to the present invention, while suppressing the bit error of the response signal common to each portable device, ensuring the reliability for communication, and increasing the processing speed of the response signal unique to each portable device, The total communication time with the remote control object can be shortened. For this reason, operation | movement or operation | movement permission of a vehicle or a building is performed smoothly and a user's convenience is ensured.

  The invention according to claim 4 comprises a portable device carried by the user, and the portable device receives an identification code when receiving a response request signal transmitted through a transmitter provided on the remote control target side. A response signal including the response signal, and when the returned response signal is received by the remote control target through a receiver provided on the remote control target side, the remote control target control device adds the response signal to the received response signal. In the remote control device that determines the validity of the included identification code and activates or permits the remote control object when it is determined to be valid, the receiver is any one of claims 1 to 3. The gist is that the receiver described in one item is adopted.

  According to the present invention, by employing the receiver according to any one of claims 1 to 3, the communication time between the portable device and the remote control target can be shortened. For this reason, based on the radio | wireless communication between a portable machine and a remote control object, the operation | movement or operation permission of a remote control object is performed smoothly.

  ADVANTAGE OF THE INVENTION According to this invention, the reliability of communication can be ensured, suppressing the increase in the communication time of the portable device which a user possesses, and a remote control object.

Hereinafter, an embodiment in which the present invention is embodied in an electronic key system will be described with reference to FIG.
<Outline of electronic key system>
As shown in FIG. 1, an electronic key system 11 as a remote control device includes a portable device 12 as an electronic key possessed by a user and an electronic control device 14 mounted on a vehicle 13 as a remote control target. Yes. The electronic control device 14 is connected to a transmitter 15 and a receiver 16 for performing mutual wireless communication with the portable device 12 unique to the vehicle 13, and as a control target of the electronic control device 14. A door lock 17 and an engine 18 are connected. The transmitter 15 includes a transmission antenna 15a, and the receiver 16 includes a reception antenna 16a. The configuration of the receiver 16 will be described in detail later.

  The electronic control unit 14 performs mutual wireless communication with the portable device 12 through the transmission antenna 15a and the reception antenna 16a, and determines the validity of the portable device 12 outside or inside the vehicle through the communication. That is, the electronic control device 14 generates a response request signal Sreq for outdoor verification that requests a response from the portable device 12, and transmits the signal to the outside of the vehicle through the transmission antenna 15a at a predetermined control period. Thereby, a detection area (not shown) of the portable device 12 is formed around the door of the vehicle 13.

  When the user holds the portable device 12 and approaches the locked vehicle and enters the detection area, the portable device 12 receives the response request signal Sreq and returns a response signal Srep including a predetermined identification code. To do. When the returned response signal Srep is received via the receiving antenna 16a, the electronic control unit 14 determines the validity of the predetermined identification code included in the received response signal Srep and determines that it is appropriate. When this occurs, the vehicle 13 is caused to perform a predetermined operation or the operation is permitted. In the present embodiment, as a predetermined operation of the vehicle 13, the electronic control device 14 electronically unlocks or unlocks the door lock 17. The validity of the identification code is determined by whether or not the identification code matches the identification code registered in the vehicle (more precisely, the electronic control unit 14).

  When the user holding the portable device 12 gets into the vehicle after unlocking the door, the electronic control unit 14 detects this by a door sensor (not shown) and transmits a vehicle interior communication (not shown) provided in the vehicle 13. By transmitting a response request signal Sreq for indoor verification through the machine, a detection area of the portable device 12 is formed in the vehicle interior. The portable device 12 receives the response request signal Sreq and returns a response signal Srep including an identification code. When the response signal Srep is received through the receiving antenna 16a, the electronic control unit 14 determines the validity of the identification code included in the response signal Srep. to approve. When the start switch (not shown) disposed in the vicinity of the driver's seat in the passenger compartment is operated by the user while the start of the engine 18 is permitted, the electronic control unit 14 starts the engine 18. Then, after the user stops the engine 18 through the operation of the start switch and then moves away from the unlocked vehicle while holding the portable device 12, the electronic control unit 14 Is detected when the response signal Srep from the portable device 12 is interrupted, and the door lock of the vehicle is electronically locked or locked.

<Receiver>
Next, the receiver 16 will be described in detail. As shown in FIG. 2, the receiver 16 includes a demodulation circuit 21, a changeover switch 22, a first filter 23, a second filter 24, and a comparator (comparator) 25. The demodulating circuit 21 demodulates the response signal Srep from the portable device 12 received through the receiving antenna 16 a and outputs it to the changeover switch 22. The changeover switch 22 switches the destination of the response signal Srep demodulated by the demodulation circuit 21 between the first filter 23 and the second filter 24 based on the changeover signal Sch output from the electronic control unit 14. . As the change-over switch 22, a mechanical contact such as a relay may be employed, or a semiconductor switch or the like may be employed.

  The first and second filters 23 and 24 remove noise included in the response signal Srep demodulated by the demodulation circuit 21 and output the noise to the comparator 25. The first and second filters 23 and 24 have different (frequency) passbands. Specifically, the pass band of the second filter 24 is set higher than that of the first filter 23. That is, the signal processing speed (bit rate) of the second filter 24 is set to be higher than the signal processing speed of the first filter 23. For this reason, it is necessary to adopt different bit formats (signal formats) for the signal processed by the first filter 23 and the signal processed by the second filter 24. That is, the bit format of the signal processed by the first filter 23 is set longer than the bit format of the signal processed by the second filter 24.

  The comparator 25 compares whether the voltage of the input signal (analog signal) is higher or lower than the reference voltage, and outputs the comparison result as high (Hi) or low (Lo). That is, the comparator 25 functions as a 1-bit A / D converter. The comparator 25 converts the demodulated response signal (analog signal) Srep from which noise has been removed by the first filter 23 or the second filter 24 into a digital signal and outputs the digital signal to the electronic control unit 14.

  The electronic control unit 14 controls the changeover switch 22 based on the communication content with the portable device 12 at that time. That is, since the portable device 12 returns some response signal Srep based on the response request signal Sreq from the vehicle side, the electronic control device 14 outputs the response request signal Sreq, and then selects which type from the portable device 12 next. It is possible to determine in advance whether the response signal Srep is returned. Then, the electronic control unit 14 switches the first and second filters 23 and 24 in accordance with the bit format of the response signal Srep returned from the portable device 12 and waits for reception in the switched state. The electronic control unit 14 switches to the first filter 23 when waiting for a signal common to the master and spare portable devices 12 (an ACK signal Sack described later), and when waiting for a signal specific to each portable device 12. (The identification signal Sid described later) is switched to the second filter 24.

<Operation of electronic key system>
Next, the operation of the electronic key system configured as described above will be described in detail.
As shown in FIG. 3 (a), the electronic control unit 14 transmits an activation signal Swake including a WAKE code for activating the portable device 12 to the outside of the passenger compartment through the transmission antenna 15a as a response request signal Sreq. Thereby, the detection area of the portable device 12 is formed around the door of the vehicle 13. At this time, as shown in FIG. 3 (d), the electronic control unit 14 switches to the first filter 23 by outputting a switching signal Sch for switching to the first filter 23 to the switch 22. Wait for reception in this state. This is because, on the electronic control device 14 side, it is known that an ACK signal Sack, which will be described later, is returned from the portable device 12 after transmitting the activation signal Swake. In the present embodiment, the ACK signal Sack This is because the first filter 23 is provided for the above processing.

  As shown in FIG. 3B, when the user carries the portable device 12 and enters the detection area, when the portable device 12 receives the activation signal Swake from the vehicle 13, the portable device 12 First, it is determined whether the WAKE code included in the activation signal Swake is valid, that is, whether the WAKE code is a registered regular signal pattern. Next, when the portable device 12 determines that the WAKE code is a regular signal pattern, the portable device 12 waits for the operation of the built-in control IC to stabilize, and then an ACK signal that is a response signal indicating that the WAKE code has been recognized normally Return Sack to the vehicle side. As shown in FIGS. 3B and 3C, when there are a plurality of portable devices 12 such as a master and a spare in the detection area, an ACK signal Sack is returned from each to the vehicle side.

  As shown in FIG. 3A, the electronic control unit 14 receives the ACK signal Sack, determines that the portable device 12 is within the detection area, and includes the registered vehicle code. An identification signal Scar is transmitted. At this time, as shown in FIG. 3 (d), the electronic control unit 14 holds the state switched to the first filter 23. This is because the electronic control device 14 side knows that the ACK signal Sack is returned again from the portable device 12 after outputting the vehicle identification signal Scar. As shown in FIG. 3B, when the portable device 12 receives the vehicle identification signal Scar, the portable device 12 collates the vehicle code included therein with the vehicle code registered in itself. And when the collation is materialized, the portable device 12 returns the ACK signal Sack to the vehicle side again. As shown in FIGS. 3B and 3C, when there are a plurality of portable devices 12 such as a master and a spare in the detection area, an ACK signal Sack is returned from each to the vehicle side.

  When the electronic control unit 14 receives the ACK signal Sack again, it transmits an authentication signal Sran including the key code. At this time, as shown in FIG. 3 (e), the electronic control unit 14 outputs a switching signal Sch for switching to the second filter 24 to the change-over switch 22, so that the second filter 24 is switched to the second filter 24. The filter is switched to the filter 24, and reception is waited in this state. This is because the electronic control device 14 side knows that the identification signal Sid is returned from the portable device 12 after transmitting the authentication signal Sran. In the present embodiment, the processing of the identification signal Sid is also known. This is because the second filter 24 is provided.

  As shown in FIG. 3B, when the portable device 12 receives the authentication signal Sran, the portable device 12 collates the key code included therein with the key code registered in itself. When the collation is established, the portable device 12 determines that its own key code is a code registered in the vehicle. Then, the portable device 12 returns an identification signal Sid including its own identification code to the vehicle side.

  In the present embodiment, a plurality of types of key codes are registered in the electronic control unit 14 so as to correspond to the spare portable device 12. Then, as shown in FIG. 3A, the electronic control device 14 transmits an activation signal Swake and a vehicle identification signal Scar, and then sequentially transmits an authentication signal Sran corresponding to the master and spare portable device 12. When the transmitted key code matches the key code registered in the portable device 12, an identification signal including an identification code is received from the portable device 12 as shown in FIGS. 3 (b) and 3 (c). Sid is returned. When the electronic control unit 14 receives the identification signal Sid, the electronic control unit 14 collates the identification code included in the identification signal Sid with the identification code registered in the identification signal Sid. Is the portable device 12 registered in the vehicle, and the door lock is unlocked or unlocked.

  Here, as described above, when a plurality of portable devices 12 such as a master and a spare are in the detection area, the ACK signal Sack is returned from both keys in response to the activation signal Swake transmitted from the vehicle side. Come. The ACK signal Sack has the same signal pattern for the master portable device 12 and the spare portable device 12 key. When the ACK signal Sack from both the master and spare portable devices 12 is returned at the same timing, there is no problem. That is, the two ACK signals Sack sent back simultaneously are combined by the electronic control unit 14 and recognized as a single ACK signal Sack. At this time, if the return timing of the ACK signal Sack is the same, the signal pattern of the synthesized ACK signal Sack recognized by the electronic control unit 14 is the same as that of the individual ACK signal Sack returned from the master and spare portable devices. Since it matches the signal pattern, the electronic control unit 14 can clearly recognize the synthesized ACK signal Sack.

  However, as shown in FIG. 5, the WAKE code determination time t1 from when the activation signal Swake is received from the vehicle 13 until the determination of the validity of the WAKE code included in the signal is completed, and the validity of the WAKE code The operation stabilization time t <b> 2 from the completion of the determination until the operation of the control IC is stabilized varies between the master and spare portable devices 12. Due to this, when the master and spare portable devices 12 receive the activation signal Swake at the same time, the reply timing of the ACK signal Sack also varies between the master portable device 12 and the spare portable device 12. Occurs.

  The ACK signals Sack from the two portable devices that are shifted from each other in time are combined and recognized as one signal by the electronic control unit 14. At this time, a bit error (here, each bit constituting the ACK signal Sack is crushed, so-called bit crushed) may occur. As shown in FIG. 5, when the pattern of the ACK signal Sack is composed of, for example, a first bit Bit1 (Hi), a second bit Bit2 (Lo), and a third bit Bit3 (Hi), The ACK signal Sack from the portable device is synthesized and recognized by the electronic control unit 14 in the following manner.

  That is, the first bit Bit1 of the ACK signal Sack received earlier and the first bit Bit1 of the ACK signal Sack received later are combined so that they are just superimposed, and the width of the first bit Bit1 is It becomes longer (in time) than the original bit width. Further, the third bit Bit3 of the ACK signal Sack received earlier and the third bit Bit3 of the ACK signal Sack received later are combined so that the width of the third bit Bit3 is originally It becomes longer (in time) than the bit width of. As a result, the width of the second bit Bit2 is the length between the front end of the third bit Bit3 of the ACK signal Sack received earlier and the rear end of the first bit Bit1 of the ACK signal Sack received later. Become. That is, in this case, the second bit Bit2 is almost crushed, and the electronic control device 14 may not be able to recognize the second bit Bit2.

  In the present embodiment, as shown in FIG. 6, when the master and spare portable device 12 simultaneously receive the activation signal Swake, even if the return timing of the ACK signal Sack from each key is slightly shifted, The bit format of the ACK signal Sack is set so that the synthesized ACK signal Sack can be recognized by the electronic control unit 14. Specifically, the ACK signal Sack that is a response signal common to each portable device 12 has a bit format that is longer than at least the bit width of the identification signal Sid that is a response signal unique to each portable device 12. Yes. When the ACK signal Sack is received, the signal processing is performed by switching to the first filter 23 corresponding to the bit format of the signal. For this reason, even if the return timing of the ACK signal Sack from the plurality of portable devices 12 is slightly shifted, the occurrence of bit errors is suppressed. As a result, the electronic control unit 14 can appropriately recognize the ACK signal Sack, and as a result, reliability for communication is ensured.

  On the other hand, the authentication signal Sran is a signal unique to each portable device 12, such as a master and a spare. In addition, the authentication signal Sran corresponding to each of the master and spare portable devices 12 is sequentially transmitted in a predetermined control cycle. For this reason, the identification signal Sid is not returned from each portable device 12 in response to the same authentication signal Sran. Therefore, unlike the ACK signal Sack that is common to each portable device 12, the identification signal Sid does not need to increase the bit width of the signal to suppress the occurrence of bit errors. Further, since the second filter 24 is provided for processing the identification signal Sid, it is necessary to set the identification signal Sid in the same bit format as the ACK signal Sack in accordance with the pass band of the first filter 23. Nor.

  Since the second filter 24 is faster in processing speed, that is, the bit rate than the first filter 23, the identification signal Sid is set in the same bit format as the ACK signal Sack and processed at the same bit rate as the ACK signal Sack. Unlike the case of doing so, the total communication time between the portable device 12 and the vehicle 13 can be shortened. Further, the communication time between the portable device 12 and the vehicle 13 is shortened by the amount of shortening the bit format of the identification signal Sid. In this manner, the communication time between the portable device 12 and the vehicle is shortened, so that unlocking or unlocking of the door of the vehicle 13 is smoothly performed.

  In the present embodiment, the response request signal Sreq for out-of-vehicle verification from the vehicle 13 includes an activation signal Swake, a vehicle identification signal Scar, and an authentication signal Sran. The activation signal Swake and the vehicle identification signal Scar are response request signals for each of the plurality of portable devices 12 corresponding to the vehicle 13. The authentication signal Sran is a response request signal for a specific portable device 12 among the plurality of portable devices 12 corresponding to the vehicle 13.

  The response signal Srep from the portable device 12 includes an ACK signal Sack and an identification signal Sid. The ACK signal Sack is a common response signal to each portable device 12 that is transmitted from each portable device 12 when the response request signal for each of the plurality of portable devices 12 corresponding to the vehicle 13 is normally received. . The identification signal Sid is transmitted from the specific portable device 12 when the response request signal for the specific portable device 12 is normally received among the plurality of portable devices 12 corresponding to the vehicle 13. It is a response signal unique to.

<Effect of Embodiment>
Therefore, according to the present embodiment, the following effects can be obtained.
(1) The ACK signal Sack, which is a response signal common to each portable device 12, has a bit format (signal format) longer than at least the bit width (signal width) of the identification signal Sid that is a response signal unique to each portable device. Was adopted. For this reason, even when the response timings of the ACK signals Sack from the plurality of portable devices 12 are slightly shifted, and the ACK signals Sack are combined and received so as to be superimposed, the occurrence of bit errors is suppressed. That is, the difference in the return timing of the ACK signal Sack from each portable device 12 is absorbed by the length of the bit format of the ACK signal Sack. Therefore, when the ACK signal Sack from each portable device 12 is combined and received, the width of each bit of the combined ACK signal Sack is secured, so that the electronic control unit 14 can generate the combined ACK signal. The signal Sack can be recognized.

  Further, as described above, the bit format of the identification signal Sid is set shorter than the bit format of the ACK signal Sack, the first filter 23 corresponding to the ACK signal Sack, and the second format corresponding to the identification signal Sid. The filter 24 is provided. Then, the pass band of the filter, that is, the bit rate of the signal is switched according to the signal to be processed (ACK signal Sack and identification signal Sid). Specifically, the first filter 23 is switched when the ACK signal Sack is processed, and the second filter 24 is switched when the identification signal Sid is processed.

  For this reason, unlike the case where the receiver 16 is provided with a filter having only a single pass band, the bit formats of the ACK signal Sack and the identification signal Sid are made the same for processing by the single filter. There is no need. Further, since the identification signal Sid is processed by the second filter 24 having a higher bit rate than the first filter 23, that is, the signal processing speed, the identification signal Sid is processed at the same bit rate as the ACK signal Sack. Unlike the case of the above, the total communication time between the portable device 12 and the vehicle 13 can be shortened. Furthermore, the communication time between the portable device 12 and the vehicle 13 is shortened by the amount that the bit format of the identification signal Sid is at least shorter than the bit format of the ACK signal Sack.

  As described above, an identification signal that is a response signal unique to each portable device 12 while ensuring reliability in communication by suppressing bit errors in the ACK signal Sack that is a response signal common to each portable device 12. By increasing the Sid processing speed, the total communication time between the portable device 12 and the vehicle 13 can be shortened.

  (2) The change-over switch 22 is in a state in which it has been previously switched to one of the first and second filters 23 and 24 corresponding to the response signal transmitted from the portable device 12, that is, the ACK signal Sack and the identification signal Sid. Wait for reception.

  The changeover switch 22 is controlled by the electronic control unit 14. Since the electronic control device 14 generates a response request signal Sreq (start signal Swake, vehicle identification signal Scar and authentication signal Sran) for the portable device 12, which signal is transmitted from the portable device 12 next. It can be determined whether it will come. For this reason, in the electronic control unit 14, it is possible to switch to the first filter 23 or the second filter 24 corresponding to the next signal sent from the portable device 12 in advance. Therefore, it is not necessary to include information for determining the signal rate in the response signal common to each portable device 12 and the response signal unique to the portable device 12. Then, the signal length of the common response signal and the unique response signal is shortened as much as the information for determining the signal rate becomes unnecessary, and the communication time between the portable device 12 and the vehicle 13 is shortened accordingly. Can be shortened.

  (3) In the vehicle electronic key system that unlocks or permits the unlocking of the door of the vehicle 13 through mutual wireless communication between the portable device 12 and the vehicle 13, the receiver 16 is used as a means for receiving a signal from the portable device 12. 13 was installed. According to the receiver 16 of the present embodiment, the wireless communication time between the portable device 12 and the vehicle 13 can be shortened, so that the door can be unlocked or unlocked smoothly. Therefore, user convenience is improved.

<Other embodiments>
In addition, you may implement this Embodiment as follows.
In the present embodiment, the comparator 25 is provided in the receiver 16, but may be provided in the electronic control device 14.

  In the present embodiment, the change-over switch 22 waits for reception in a state in which the change-over switch 22 is switched in advance to the filter corresponding to the response signal transmitted from the portable device 12, but may be as follows. That is, a pre-bit for bit rate determination is provided in the response signal (ACK signal Sack and identification signal Sid) returned from the portable device 12, and the changeover switch 22 is connected to the first filter 23 and the first filter 23 based on the contents of the pre-bit. You may make it switch between two filters 24. FIG. That is, before receiving the response signal from the portable device 12, instead of switching the changeover switch 22, the response signal from the portable device 12 is received and based on the information included in the received response signal, The changeover switch 22 is switched. In this case, the receiver 16 is provided with control means for switching control of the changeover switch 22 based on a pre-bit for bit rate determination included in the response signal returned from the portable device 12. This is because it is necessary to switch the changeover switch 22 before the response signal from the portable device 12 is input to the electronic control device 14 on the vehicle 13 side.

  In the present embodiment, the electronic control unit 14 determines the validity of the identification code included in the response signal Srep from the portable device 12, and performs a predetermined operation on the vehicle 13 when determining that it is appropriate. The door lock 17 is permitted to be unlocked or unlocked as the predetermined operation, but other operations may be performed. Other operations include, for example, starting or starting permission of the engine 18 and unlocking or unlocking of a steering lock (not shown).

  In the present embodiment, the receiver 16 is provided in the vehicle electronic key system 11, but may be provided in a building electronic key system. In this case, the building is a target for remote control. The receiver 16 according to the present embodiment may be applied not only to the vehicle 13 or the building but also to a system (apparatus) that targets other devices as remote control targets.

The block diagram which shows schematic structure of an electronic key system. The block diagram which shows schematic structure of a receiver. (A)-(e) is a timing chart which shows operation | movement of an electronic control apparatus, a portable machine, and a changeover switch. The timing chart which shows operation | movement of an electronic control apparatus and a portable machine. The timing chart which shows the shift | offset | difference of the reply timing of the ACK signal from a master and a spare portable machine. 6 is a timing chart showing an improved bit format of an ACK signal to absorb a difference in response timing of an ACK signal from a master and a spare portable device.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Electronic key system (remote control device), 12 ... Portable machine, 13 ... Vehicle (remote control object), 14 ... Electronic control device, 15 ... Transmitter, 15a ... Transmission antenna, 16 ... Receiver, 16a ... Reception antenna , 21 ... demodulator circuit, 22 ... changeover switch, 23 ... first filter, 24 ... second filter, 25 ... comparator, Sch ... switching signal, Srep ... response signal, Sreq ... response request signal.

Claims (4)

A modulated response signal generated from a portable device possessed by a user in response to a response request signal generated by a remote control target control device and transmitted through a transmitter provided on the remote control target side. A receiving antenna; a demodulating circuit that demodulates a response signal received through the antenna; a filter that removes noise included in the response signal demodulated by the demodulating circuit; and a demodulated signal from which noise has been removed by the filter In a receiver that includes a comparator that converts a response signal into a digital signal, and that outputs a digital signal output from the comparator to the control device,
The response signal from the portable device is a response common to each portable device that is transmitted from each portable device when the response request signal for each of the plurality of portable devices corresponding to the remote control target is normally received. And a response signal specific to each portable device transmitted from the specific portable device when a response request signal for the specific portable device among the plurality of portable devices corresponding to the remote control target is normally received. The common response signal and the specific response signal are a series of signals for exerting a specific function of the remote control target, and the common response signal among these signals is at least the specific response signal. Adopt a signal format longer than the signal width of the response signal,
In addition, the filter includes first and second filters having different pass bands corresponding to the common response signal and the unique response signal, and the second filter is more than the first filter. Try to set the passband high,
Further, the switch includes a selector switch for switching the first and second filters based on a switch signal from a remote control target control device, and the selector switch receives a common response signal in the series of signals. In the receiver, the receiver is switched to the first filter and to the second filter at the timing of receiving the unique response signal in the series of signals . The receiver of claim 1,
The change-over switch is a receiver that waits for reception in a state in which the change-over switch is previously switched to a filter corresponding to a response signal transmitted from the portable device.   The receiver according to claim 1 or 2, wherein the remote control target is a vehicle or a building.   A portable device possessed by the user is provided. When the portable device receives a response request signal transmitted through a transmitter provided on the remote control target side, the portable device returns a response signal including an identification code and returns the response signal. When the received response signal is received by the remote control target through a receiver provided on the remote control target side, the remote control target control device determines the validity of the identification code included in the received response signal. In addition, in the remote control device that operates or permits the operation of the remote control object when it is determined to be appropriate, the receiver according to any one of claims 1 to 3 is adopted as the receiver. Remote control device designed to do this.

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