JP2005330651A - Door unlock control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress power consumption on an in-vehicle device side and to increase power consumption on a portable device side by not transmitting a signal containing ID information constantly by intermittently transmitting a signal not containing ID information. A door unlocking control device capable of suppressing the above is provided.
An in-vehicle device 21 is configured to transmit a request signal a when a request transmission request signal c is received from a portable device 12, and the portable device 13 has a smaller amount of information than a response signal b including ID information. The request transmission request signal c is transmitted. In addition, when the vehicle-mounted device 21 does not receive a response signal from the portable device 13 after a predetermined time has elapsed since the start of transmission of the request signal a, the transmission of the request signal a is stopped, and the predetermined time is: A predetermined time interval (mobile device transmission interval Tk) at which the portable device 13 intermittently transmits the request transmission request signal c is assumed. In addition, a request transmission request signal c is transmitted from the portable device 13 when the vibration of the portable device 13 is detected by the G sensor provided in the portable device 13.
[Selection] Figure 2

Description

  The present invention relates to a door unlock control device for performing unlock control of doors such as a driver's seat door and a back door of a vehicle.

  Recently, a unique encryption code is set for a portable device held (carried) by a holder such as a driver without using a mechanical key and an on-vehicle device provided in the vehicle, and between the portable device and the on-vehicle device. A system that unlocks each door such as a driver's door of the vehicle by performing wireless communication and confirming the verification of the cipher has begun to spread. Such a system is generally referred to as a keyless entry system.

  In this keyless entry system, there are two types of encryption verification: a method in which the proximity of the portable device to the door is detected (proximity method) and a behavior of the portable device holder (such as touching the door knob). There are two methods: a method for starting collation (direct input method). The former proximity method is superior to the latter input method in that the operation of the portable device holder involved in unlocking the door is completely eliminated and the door unlocking is completely automatic.

  As a conventional example of a door unlocking control apparatus applied to such a proximity type keyless entry system, there is an apparatus described in Patent Document 1 below. In Patent Document 1, when a portable device receives a request signal that is constantly transmitted from the vehicle-mounted device, the portable device transmits a signal (ID signal) including predetermined ID (identification) information to the vehicle-mounted device. A technique is disclosed in which unlocking control of a vehicle door is performed by performing predetermined encryption verification based on the ID signal.

JP 2002-21386 A

  However, the technique described in Patent Document 1 has a problem that power consumption on the vehicle-mounted device side is large because the vehicle-mounted device needs to constantly transmit a request signal.

  In addition, when the ID signal is always transmitted from the portable device, and the vehicle-mounted device is configured to perform the encryption verification when the ID signal is received and control the unlocking of the vehicle door, the power consumption on the portable device side this time There was a problem that became larger.

  Therefore, in view of the above circumstances, the present invention provides a door unlocking control device that can suppress power consumption on the vehicle-mounted device side and can also suppress an increase in power consumption on the portable device side. And

  A door unlocking control device according to a first aspect of the present invention that solves the above problems is provided in a vehicle and has onboard equipment that transmits a first signal to the outside of the vehicle and predetermined information when the first signal is received. A portable device that transmits a second signal, and includes door unlock control means for performing a predetermined collation based on the second signal from the portable device and controlling the unlocked state of the vehicle door. In the door unlocking control device, a third signal having a smaller amount of information than the second signal can be transmitted to the portable device, and the vehicle-mounted device receives the third signal when the first signal is received. The signal is transmitted.

  Moreover, the door unlocking control apparatus of 2nd invention is the door unlocking control apparatus of 1st invention, The said door unlocking control means is predetermined time after the said onboard equipment starts transmission of the said 1st signal. When the second signal is not received from the portable device after the elapse of time, the transmission of the first signal is stopped.

  Further, in the door unlocking control device of the third invention, in the door unlocking control device of the second invention, the predetermined time is a predetermined time interval at which the portable device intermittently transmits the third signal. Features.

  According to a fourth aspect of the present invention, there is provided the door unlocking control device according to the first, second or third invention, wherein the portable device has a vibration detecting means for detecting vibration, the vibration detecting means. The third signal is transmitted when vibration of the portable device is detected by the above.

  According to the door unlocking control device of the first invention, since the vehicle-mounted device is configured to transmit the first signal when the third signal is received from the portable device, the first signal is always transmitted. It is not necessary to save the power consumption on the in-vehicle device side, and the portable device is configured to transmit the third signal having a smaller amount of information than the second signal. The increase is small.

  According to the door unlocking control device of the second invention, even if the third signal received by the vehicle-mounted device (the signal determined to be the third signal) is a noise radio wave, the vehicle-mounted device receives the first signal. When the response signal is not received from the portable device after the elapse of a predetermined time from the start of the transmission, since the transmission of the first signal is stopped, the useless power consumption on the vehicle-mounted device side can be suppressed.

  Moreover, according to the door unlocking control device of the third invention, the predetermined time is a predetermined time interval (mobile device transmission interval) at which the portable device intermittently transmits the third signal. Intermittent transmission can be performed at the predetermined time interval. That is, the third signal is intermittently transmitted from the portable device at a relatively long time interval (for example, the portable device transmission interval obtained based on the reachable distance of the third signal and the assumed maximum moving speed of the portable device holder). However, since the first signal is continuously transmitted from the vehicle-mounted device until the third signal is transmitted after the third signal is transmitted, the portable device holder (portable device) When the first signal and the second signal reach within the reachable distance, the first signal and the second signal are exchanged reliably and promptly between the portable device and the vehicle-mounted device, and the door The lock will be done promptly. For this reason, the third signal can be intermittently transmitted.

  According to the door unlocking control device of the fourth aspect of the invention, when the vibration of the portable device is detected by the vibration detecting means, that is, when the portable device is carried by a driver or the like and vibrates, Since the third signal is transmitted, the power consumption on the portable device side can be further suppressed as compared with the case where the third signal is always transmitted.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

<Embodiment 1>
FIG. 1 is a layout diagram of a door unlock control device according to a first embodiment of the present invention, FIG. 2 is a block diagram showing a configuration of the door unlock control device, and FIG. 3 is an on-vehicle device of the door unlock control device. The flowchart which shows the process sequence of main ECU in FIG. 4, FIG. 4 is explanatory drawing which shows the mode of the radio | wireless communication of the onboard equipment of the said door unlocking control apparatus, and a portable device.

  As shown in FIG. 1, the vehicle 1 includes a main ECU 2 that also controls the vehicle-mounted device (see FIG. 2) as door unlock control means, a communication device 3 as wireless communication means, a transmission antenna 7 and a reception antenna 8. And are provided. The main ECU 2 is an electronic control unit having a CPU, a memory, and the like. The main ECU 2 is arranged at the front portion of the vehicle 1 and controls the door unlocking as door unlocking control means. Also controls. The communication device 3 is arranged at the front portion of the vehicle 1 and has a transmission unit 11 and a reception unit 12, and a reception antenna 8 is connected to the reception unit 12.

  The transmission antenna 7 is arranged on the door 4 on the driver's seat side, the door 5 on the passenger seat side, and the back door 6 of the vehicle 1, respectively. And a portable device 13 held (carried) by a holder such as a driver, by wireless communication, a request signal (signal with ID) a as a first signal and a response signal (ID as a second signal) Attached signal) b and a request transmission request signal c as a third signal are transmitted and received (details will be described later), thereby automatically unlocking the driver's seat door 4, the passenger seat door 5 or the back door 6 ( Keyless).

  Of course, the invention is not limited to this. For example, the rear seat door of the vehicle 1 may be automatically unlocked, or only the driver seat door 4 is automatically unlocked. Also good. The positions of the antennas 7 and 8 can also be changed as appropriate.

  Then, based on FIGS. 2-4, the concrete structure of this door unlocking control apparatus, etc. are demonstrated in detail.

  As shown in FIG. 2, the vehicle-mounted device 21 includes the main ECU 2, the communication device 3 having the transmission unit 11, the reception unit 12 and the reception antenna 8, and the transmission antenna 7, and the main ECU 2 and the communication device 3 ( A battery 22 is also provided for supplying power to the transmitter 11 and the receiver 12). The battery 22 is mounted in the engine room of the vehicle 1 and is used as a power source for the vehicle-mounted device 21 and also used as a power source for electric devices of the entire vehicle 1 such as various motors and control devices. Is.

  Although details will be described later, in the main ECU 2, when the reception unit 12 of the communication device 3 receives the request transmission request signal c transmitted from the portable device 13 via the reception antenna 8, ID (identification) as predetermined information A request signal a including information is transmitted from the transmission unit 11 of the communication device 3 to the portable device 13 via the transmission antenna 7. In the main ECU 2, after transmitting the request signal “a”, when the receiving unit 12 of the communication device 3 receives the response signal “b” transmitted from the portable device 13 in response to the request signal “a” via the receiving antenna 8, A verification check is made between the encryption (ID information) contained in the response signal b and the encryption (ID information) stored in the memory of the main ECU 2 in advance. The driver's seat door 4, the passenger seat door 5 or the back door 6 is unlocked by controlling the actuator of the apparatus.

  On the other hand, the portable device 13 includes a portable device ECU 31 as a control means having a CPU, a memory, etc., a communication device 32 as a wireless communication means, a transmission antenna 35 and a reception antenna 36, and a portable device built-in battery 37. Have. The communication device 32 includes a transmission unit 33 and a reception unit 34, a transmission antenna 35 is connected to the transmission unit 33, and a reception antenna 36 is connected to the reception unit 34. The portable device built-in battery 37 supplies power to the portable device ECU 31, the communication device 32 (the transmission unit 33 and the reception unit 34), and the display 38.

  Then, the portable device ECU 31 intermittently transmits the request transmission request signal c from the transmission unit 33 of the communication device 32 to the vehicle-mounted device 21 via the transmission antenna 35 at a predetermined time interval (portable device transmission interval Tk) (for example, 2 Second interval: described later in detail).

  The request transmission request signal c may be a minimum signal that has only the purpose of requesting the vehicle-mounted device 21 in the standby reception state to transmit the request signal a. That is, since the request transmission request signal c may be simply a trigger signal for starting transmission of the request signal a to the vehicle-mounted device 21, it does not include ID information or the like, and is more information than the response signal b. The signal is small (such as a simple pulse signal). Therefore, the request transmission request signal c has a very short transmission time (energization time for transmission) compared to the response signal b including ID information, and can be transmitted with a small amount of power.

  In the portable device ECU 31, after transmitting the request transmission request signal c, the reception unit 34 of the communication device 32 receives the request signal a transmitted from the vehicle-mounted device 21 in response to the request transmission request signal c via the reception antenna 36. Upon receipt, the cipher (ID information) included in the request signal a is collated with the cipher (ID information) stored in advance in the memory of the portable device ECU 31, and as a result, it is confirmed that the ciphers match. Then, the response signal b including the ID information as the predetermined information is transmitted from the transmission unit 33 of the communication device 32 to the vehicle-mounted device 21 via the transmission antenna 35.

  However, the present invention is not necessarily limited to this, and power consumption is reduced by a combination of transmission of a signal including ID information that consumes a large amount of power and transmission of a signal that does not include ID information and has a short transmission time and very low power consumption. As a method for the purpose, the in-vehicle device 21 transmits a request signal a that does not include predetermined information (ID information), and the portable device 13 receives the request signal a and checks the encryption (ID information). The response signal b including the ID information may be transmitted to the vehicle-mounted device 21 without performing the above.

  Next, the processing procedure of the main ECU 2 of the vehicle-mounted device 21 will be described in detail based on the flowchart of FIG.

  As shown in FIG. 3, the main ECU 2 first determines whether the reception unit 12 of the communication device 3 has received the request transmission request signal c transmitted from the portable device 13 (whether or not the request transmission request signal c has been received). ) Is determined (step S1). As a result, when it is determined in step S1 that “request transmission request signal c is not received”, the determination in step S1 is repeated until the request transmission request signal c is received.

  When the receiving unit 12 of the communication device 3 receives the request transmission request signal c via the receiving antenna 8, it determines that “the request transmission request signal c has been received” in step S1, and the number N of transmissions of the request signal a. 1 (N = 1) (step S2), the request signal a including the ID information is transmitted from the transmitter 11 of the communication device 3 to the portable device 13 via the transmission antenna 7 (step S3).

  When the portable device 13 receives the request signal a, as described above, after checking the encryption based on the request signal a and determining that the encryption is matched, the portable device 13 sends the response signal b including the ID information to the vehicle-mounted device 21. Send to.

  Subsequently, the main ECU 2 determines whether or not the receiving unit 12 of the communication device 3 has received the response signal b transmitted from the portable device 13 (whether or not the response signal b has been received) (step S4). If it is determined in this step S4 that “response signal b has not been received”, the transmission of the request signal a is repeated a predetermined number of times (steps S8 and S9), details of which will be described later.

  When the receiving unit 12 of the communication device 3 receives the response signal b via the receiving antenna 8, it determines that “response signal b has been received” in step S4, and the encryption (ID information) included in the response signal b. Then, the encryption (ID information) stored in the memory of the main ECU 2 is checked to determine whether the encryption (ID information) matches (step S5). As a result, when it is determined in step S5 that “the encryption is matched”, the actuator of the door lock device of the driver's seat door 4 is controlled to unlock the driver's seat door 4.

  On the other hand, when it is determined in step S5 that “the ciphers do not match”, the driver's seat door 4 is not unlocked, and “unlockable” is transmitted from the transmitter 11 of the communication device 3 to the portable device 13 via the transmission antenna 7. A signal for “notification (error) display” is transmitted (step S7). In the portable unit ECU 31 of the portable unit 13, when the receiving unit 34 receives the signal via the receiving antenna 36, “unlocking notification (error)” for a predetermined time (for example, two minutes) set in advance based on the signal. Display) "and return to step S1.

  Next, the case where it is determined in step S4 that “response signal b has not been received” will be described in detail.

  In this case, the portable device transmission interval Tk is compared with a value (Ta × N) obtained by multiplying the in-vehicle device reception confirmation interval Ta by the request signal transmission count N (step S8). As a result, if Ta × N is smaller than Tk (Tk> Ta × N), N = N + 1 is performed to increase the value of N by “1” (step S9), and then the request signal a is carried. The data is transmitted again to the machine 13 (step S3), and the determination in step S4 (response signal reception confirmation) is performed again. At this time, if it is determined in step S4 that “response signal b has not been received”, Tk is again compared with Ta × N (step S8). If Ta × N is smaller than Tk (Tk) > Ta × N), the process of N = N + 1 is performed again to further increase the value of N by “1” (step S9), and then the request signal a is transmitted to the portable device 13 again (step S3). The determination in step S4 (response signal reception confirmation) is performed again.

  Thereafter, while it is determined that “response signal b is not received” in step S4 and “Tk> Ta × N” is determined in step S7, the above processing (steps S3, 4, 8, 9) is performed. ) Is repeated. That is, the transmission of the request signal a in step S3 is repeated. Then, when the processes of steps S3, 4, 8, and 9 are repeated a predetermined number of times (for example, 20 times: details will be described later) and the request signal a is transmitted the predetermined number of times, Ta × N is equal to or higher than Tk. Therefore, in step S8, it is determined that “Tk ≦ Ta × N”, and transmission of the request signal a (step S3) is stopped, and the process returns to step S1. Such a function of repeating the transmission of the request signal a is referred to herein as a “recycling function”.

  Here, the portable device transmission interval Tk is a time interval at which the request transmission request signal c is intermittently transmitted from the portable device 13 as described above. The in-vehicle device reception confirmation interval Ta is a time interval (for example, 0.1) from the response signal reception confirmation in step S4 to the process in steps S8, S9, and S3 and the response signal reception confirmation in step S4 again. Second). Accordingly, the calculation of “Ta × N” in step S8 starts transmission of the request signal a (that is, receives the request transmission request signal c in step S1, and transmits the first request signal a in step S3). The elapsed time since the start of

  According to the above recycling function, even if the request transmission signal c received by the vehicle-mounted device 21 is a noise radio wave (even if the noise radio wave is erroneously determined to be the request transmission signal c), the vehicle-mounted device 21 receives the request signal. Since the transmission of the request signal “a” is stopped after a predetermined time has elapsed since the transmission of “a” is started (when “Tk ≦ Ta × N” in step S8), useless consumption of the vehicle-mounted device 21 There is an effect that electric power can be suppressed. The above recycling function not only provides such an effect, but the transmission of the request transmission signal c from the portable device 13 is not continuous transmission, but intermittent transmission (transmission at a predetermined portable device transmission interval Tk). ) Is a function necessary to be able to. This will be described in detail with reference to FIG.

  4A, the portable device 13 together with the portable device holder moves in the direction of the vehicle 1 stopped as indicated by an arrow A, and the antenna of the vehicle-mounted device 21 provided on the driver's seat door 4 of the vehicle 1 is shown. 7 and 8 show a state when approaching the reachable distance L1 of the request transmission request signal c. The reachable distance L1 of the request transmission signal c may be longer than the reachable distance L2 (generally, for example, 1 m) of the request signal a and the response signal b, but is considered to be preferably about 5 m to 10 m. For example, 6 m.

  In FIG. 4B, the portable device 13 together with the portable device holder further moves in the direction of the vehicle 1 as indicated by an arrow A, and the antennas 7 and 8 of the vehicle-mounted device 21 provided on the driver's seat door 4 of the vehicle 1. On the other hand, a state when the request signal a and the response signal b are approached to the reachable distance L2 is shown.

  The portable device transmission interval Tk is, for example, the reachable distance L1 of the request transmission request signal c and the maximum moving speed assumed as the speed at which the portable device holder moves and approaches the vehicle 1 (the antennas 7 and 8 of the vehicle-mounted device 21). V is set based on V. In this case, if the reachable distance L1 is 6 m and the assumed maximum moving speed V is 3 m / second, the portable device transmission interval Tk is Tk = L1 / V = 6/3 = 2 seconds. Thus, even if the portable device holder approaches the driver's seat door 4 of the vehicle 1 at the assumed maximum moving speed V, the portable device holder must drive the vehicle 1 at all times during the reachable distance L1. Before reaching the seat door 4, the request transmission request signal c is transmitted from the portable device 13 at least once, and the request transmission request signal c reaches the reception antenna 8 of the vehicle-mounted device 21 and is received by the vehicle-mounted device 21. Will be. Note that the present invention is not necessarily limited to this, and the portable device transmission interval Tk may be 2 seconds or less. That is, the portable device transmission interval Tk may be equal to or shorter than the time interval (L1 / V) obtained based on the reachable distance L1 of the request transmission signal c and the assumed maximum moving speed V.

  The number N of transmissions of the request signal a is set based on the portable device transmission interval Tk and the in-vehicle device reception confirmation interval Ta. For example, if the portable device transmission interval Tk is 2 seconds and the in-vehicle device reception confirmation interval Ta is 0.1 second, the request signal transmission count N is N = Tk / Ta = 20 times.

  In this case, if reception of the response signal b is not confirmed in step S4, the processes of steps S3, 4, 8, and 9 are repeated 20 times. That is, the transmission of the request signal a is repeated until “N = N + 1 = 20” in step S9 and the 20th request signal transmission is performed in step S3. When the request signal a is transmitted 20 times, it is determined in step S8 that “Tk ≦ Ta × N”, that is, “2 ≦ 0.1 × 20”, and the current request signal a is repeatedly transmitted. Is stopped, and the processing returns to the processing of step S1 (reception confirmation of the request transmission request signal c). That is, when a request transmission request signal c is transmitted from the portable device 13 and reception of the request transmission request signal c is confirmed in step S1, Tk seconds (for example, 2 seconds later) after the request transmission request signal c is transmitted. ) Until the next request transmission request signal c is transmitted from the portable device 13, the request signal a is continuously transmitted (repeatedly transmitted) by the recycle function, and after Tk seconds (for example, after 2 seconds), When the reception of the next request transmission request signal c is confirmed in step S1 and the request transmission request signal c is received, the request is again made by the recycle function until the next request transmission request signal c is transmitted. The process that the signal a continues to be transmitted (repeatedly transmitted) is repeatedly performed.

  While the request signal a is repeatedly transmitted, the portable device 13 together with the portable device holder transmits the request signal a to the vehicle 1 (the transmission antenna 7 of the vehicle-mounted device 21) as shown in FIG. When reaching the reachable distance L2 (for example, 1 m), the request signal a transmitted from the vehicle-mounted device 21 at this time is received by the portable device 13. As a result, the response signal b is transmitted from the portable device 13, the response signal b is received by the vehicle-mounted device 21, the encryption verification is performed by the vehicle-mounted device 21, and the driver seat door 4 is unlocked.

  As described above, in this embodiment, even if the onboard unit 21 side receives the request transmission request signal c from the portable device 13 and transmits the request signal a, the request signal a is not received. The transmission is continued at a relatively short interval (for example, 0.1 second). For this reason, when the portable device 13 comes closer to the vehicle 1 side than the reachable distance L2 together with the portable device holder, the portable device 13 can immediately receive the request signal a, and the control in steps S4 to S6 is executed. Therefore, the driver's seat door 4 is unlocked accurately.

  Furthermore, even if the holder of the portable device 13 is closer to the vehicle 1 than the reachable distance L1 of the request transmission request signal c and stays farther from the vehicle 1 than the reachable distance L2 of the request signal a, the recycling function Since the process in (S3, S4, S8, and S9) continues for the portable device transmission interval Tk and then returns to step S1, the request transmission request signal c is just transmitted at the next transmission timing of the request transmission request signal c. The request transmission request signal c is immediately received, and the request signal a can be continuously transmitted without almost stopping. In other words, after the in-vehicle device 21 receives the request transmission request signal c once from the portable device 13, the portable device response signal b cannot be received from the portable device 13, but the request transmission request signal c continues to be received. In this case, the request signal a is transmitted intermittently.

  As a result, the driver's seat door 4 can be unlocked accurately even when the portable device 13 is always closer to the vehicle 1 than the reachable distance L2 of the request signal a. That is, the transmission interval of the request transmission request signal c and the reception confirmation timing of the request transmission request signal c (timing to return to step S1 again after step S8 is received after receiving the request transmission request signal c in step S1). As a result, it is possible to prevent the transmission of the request signal a from being temporarily stopped.

  As described above, according to the door unlocking control device of the first embodiment, the vehicle-mounted device 21 is configured to transmit the request signal a when receiving the request transmission request signal c from the portable device 13. Since it is not necessary to always transmit the request signal a as in the prior art, the power consumption on the vehicle-mounted device 21 side is much smaller than in the prior art. Moreover, since the portable device 13 is configured to transmit the request transmission request signal c having a much smaller amount of information than the response signal b having ID information, the increase in power consumption on the portable device 13 side is very small.

  Further, according to the door unlocking control device of the first embodiment, even if the signal that is determined to be the request transmission request signal c received by the vehicle-mounted device 21 is a noise radio wave, the vehicle-mounted device 21 receives the request signal. When the response signal b is not received from the portable device 13 after the elapse of a predetermined time (portable device transmission interval Tk) since the transmission of “a” is started, the transmission of the request signal “a” is stopped. Electric power can be suppressed.

  Moreover, since the predetermined time is a predetermined time interval (portable device transmission interval Tk) at which the portable device 13 intermittently transmits the request transmission signal c, the request transmission signal c is changed to the predetermined time interval (portable device transmission interval Tk). ) Can be intermittently transmitted. That is, as described above, even if the request transmission request signal c is intermittently transmitted from the portable device 13 at a relatively long portable device transmission interval Tk (for example, 2 seconds), the request transmission request signal c is transmitted and the next request transmission is performed. Until the signal c is transmitted, the request signal a is continuously transmitted (repeatedly transmitted) from the vehicle-mounted device 21, so that the portable device holder (portable device 13) is surely reached within the reachable distance L <b> 2. In addition, since the request signal a and the response signal b are quickly communicated between the portable device 13 and the vehicle-mounted device 21 and the driver's seat door 4 is unlocked promptly, the request transmission request signal c Intermittent transmission is possible. For example, the request transmission signal c can be intermittently transmitted by the portable device transmission interval Tk (L1 / V) obtained based on the reachable distance L1 of the request transmission request signal c and the assumed maximum moving speed V. For this reason, compared with the case where the request transmission request signal c is always transmitted, the power consumption on the portable device 13 side can be suppressed.

  In addition, the present invention can be realized without adding significant hardware modifications to the existing proximity type smart entry system (automatic encryption verification type door unlocking control device).

<Embodiment 2>
FIG. 5 is a block diagram showing a configuration of a door unlocking control apparatus according to Embodiment 2 of the present invention.

  As shown in FIG. 5, in the door unlocking control device of the second embodiment, the portable device 13 includes a vibration detector 41. The vibration detector 41 includes a G sensor (acceleration sensor) 42 as vibration detection means for detecting the vibration of the portable device 13 and a control element 43 such as a transistor or a thyristor. The G sensor 42 is connected to the portable machine ECU 31 via the control element 43. The portable device built-in battery 37 also supplies power to the control element 43.

  When the G sensor 42 detects vibration, the control element 43 is turned on (conductive), and a vibration detection signal is input to the portable device ECU 31. On the other hand, when the G sensor 42 does not detect vibration, the control element 43 is turned off (conductive) and no vibration detection signal is input to the portable device ECU 31. And in portable machine ECU31, when the said vibration detection signal is not input, transmission of the request transmission request signal c from the transmission part 33 is stopped, and only when the said vibration detection signal is input, the request transmission request | requirement is transmitted from the transmission part 33. The signal c is transmitted.

  Accordingly, when the holder does not carry the portable device 13 as in a stationary state, the portable device 13 does not vibrate, and the G sensor 42 does not detect vibration. The vibration detection signal is not input to the portable device ECU 31 in the OFF state. For this reason, in portable machine ECU31, transmission of the request transmission request signal c from the transmission part 33 to the onboard equipment 21 is stopped.

  On the other hand, when the holder is carrying the portable device 13 and moving (approaching the vehicle), the portable device 13 vibrates, the G sensor 42 detects this vibration, and the control element 43 is in the ON state. Therefore, the vibration detection signal is input to the portable device ECU 31. For this reason, the portable device ECU 31 transmits the request transmission request signal c from the transmission unit 33 to the vehicle-mounted device 21. That is, in the portable device 13 (see FIG. 2) of the first embodiment, the request transmission signal c is constantly transmitted intermittently at a predetermined portable device transmission interval Tk, whereas the portable device of the second embodiment. 13, the request transmission signal c is intermittently transmitted at a predetermined portable device transmission interval Tk only when the G sensor 42 detects vibration (when the holder carries the portable device 13 and moves). The

  In addition, since it is the same as that of the door unlocking control apparatus (refer FIG. 2) of the said Embodiment 1, about the structure except the above, the same code | symbol is attached | subjected and detailed description here is abbreviate | omitted.

  As described above, according to the door unlocking control device of the second embodiment, only when the vibration of the portable device 13 is detected by the G sensor 42, that is, the portable device 13 is carried by a driver or the like. Since the request transmission request signal c is transmitted from the portable device 13 only when it vibrates, the power consumption on the portable device 13 side can be further suppressed as compared with the case of constantly transmitting the request transmission request signal c.

  In addition, here, since the power supply from the portable device built-in battery 37 to the transmitter 33 and the receiver 34 of the communication device 32 is cut off when the portable device is not used (when the portable device is not carried), the portable device is not used. In this case, the current consumption (dark current) in the transmitter 33 occupying most (for example, 96.5%) of the total current consumption (dark current) of the portable device 13 is eliminated. it can.

  As for the G sensor, a microchip type that can be built in a portable device has recently been developed and marketed, and there are no problems in size and current consumption.

  The present invention relates to a door unlocking control device, and without using a mechanical key, by performing wireless communication between a portable device and a vehicle-mounted device and performing verification verification of encryption, each of a driver's seat door, a back door, etc. It is useful when applied to a smart entry system that controls door unlocking.

It is an arrangement plan of a door unlocking control device according to Embodiment 1 of the present invention. It is a block diagram which shows the structure of the said door unlocking control apparatus. It is a flowchart which shows the process sequence of main ECU in the onboard equipment of the said door unlocking control apparatus. It is explanatory drawing which shows the mode of the radio | wireless communication of the onboard equipment of the said door unlocking control apparatus, and a portable device. It is a block diagram which shows the structure of the door unlocking control apparatus which concerns on Example 2 of this invention.

Explanation of symbols

1 Vehicle 2 Main ECU
DESCRIPTION OF SYMBOLS 3 Communication apparatus 4 Driver's seat door 5 Passenger's seat door 6 Back door 7 Transmitting antenna 8 Receiving antenna 11 Transmitting part 12 Receiving part 13 Portable machine 21 Onboard equipment 22 Battery 31 Portable machine ECU
32 Communication device 33 Transmitter 34 Receiver 35 Transmit antenna 36 Receive antenna 37 Mobile device built-in battery 41 Vibration detector 42 G sensor 43 Control element a Request signal b Response signal c Request transmit signal

Claims (4)

An in-vehicle device provided in the vehicle and transmitting the first signal to the outside of the vehicle;
A portable device that transmits a second signal having predetermined information when the first signal is received;
In the door unlocking control device having door unlocking control means for performing a predetermined collation based on the second signal from the portable device and controlling the unlocking state of the door of the vehicle,
A third signal having a smaller amount of information than the second signal can be transmitted to the portable device,
The on-vehicle device transmits the first signal when receiving the third signal.   The door unlock control means transmits the first signal when the vehicle-mounted device does not receive the second signal from the portable device after a lapse of a predetermined time from the start of transmission of the first signal. The door unlocking control device according to claim 1, wherein the door unlocking control device is stopped.   The door unlock control device according to claim 2, wherein the predetermined time is a predetermined time interval at which the portable device intermittently transmits the third signal.   The portable device has vibration detection means for detecting vibration, and transmits the third signal when the vibration of the portable device is detected by the vibration detection means. The door unlocking control device according to 2 or 3.

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