JP5041337B2 - Keyless entry system - Google Patents

Description

  The present invention relates to a keyless entry system that controls locking and unlocking of a vehicle by performing electronic authentication between an in-vehicle device installed in a vehicle and a portable transceiver carried by a user, more specifically, The present invention relates to a keyless entry system that reduces leakage of signals exchanged when performing electronic authentication to the outside of a passenger compartment.

  The following technology is known as a keyless entry system for controlling locking and unlocking of a vehicle by performing electronic authentication between an in-vehicle device installed in the vehicle and a portable transceiver carried by the user. . First, the in-vehicle device transmits a vehicle interior request signal from a request signal transmission unit installed on a floor surface in the vehicle interior. When the portable transceiver owned by the user receives the transmitted vehicle interior request signal, the portable transceiver transmits a unique ID signal to the in-vehicle device. The in-vehicle device that has received the ID signal authenticates the ID signal, and if the authentication is successful, locks from outside the vehicle compartment are prohibited assuming that the portable transceiver is in the vehicle compartment. This prevents the portable transceiver from being closed in the vehicle interior.

  However, in the above-described technique, the request signal transmission unit is usually installed on the floor surface or the like. For this reason, the detection range of the portable transceiver by the request signal transmission unit is a limited range near the floor surface. For this reason, unless the position of the seat is within a limited range near the floor surface, it is impossible to prevent the vehicle interior from being closed due to the misplacement of the portable transceiver near the seat.

Therefore, conventionally, as a keyless entry system for preventing the vehicle interior from being closed due to the misplacement of the portable transceiver near the seat, a technique in which a request signal transmission unit is integrally provided on the seat has been proposed. In this technique, since the request signal transmission unit is integrally provided on the seat, the detection range of the portable transceiver by the request signal transmission unit is surely near the seat.
JP 2005-105681 A

  However, in the above-described conventional technology, if the position of the seat moves, the detection range of the portable transceiver by the request signal transmission unit also moves, so that the movement of the detection range may extend outside the passenger compartment. In other words, since the signal exchanged when performing electronic authentication leaks outside the vehicle compartment, the outside of the vehicle compartment is also within the detection range of the portable transceiver, and the user can carry it within the detection range of the portable transceiver outside the vehicle compartment. Even if you have a transceiver and try to lock it, you will not be able to lock it.

  Therefore, the present invention has been made in view of the above problems. That is, an object of the present invention is to provide a keyless entry system capable of reducing leakage of signals exchanged when performing electronic authentication to the outside of the vehicle interior and more reliably detecting that the portable transceiver is in the vehicle interior. And

An aspect of the present invention is directed to a keyless entry system that controls locking and unlocking of a vehicle by performing electronic authentication between an in-vehicle device installed in the vehicle and a portable transceiver carried by the user. In the present invention, the in-vehicle device includes a request signal transmission unit that transmits a vehicle interior request signal, and the portable transceiver includes a request signal reception unit that receives a vehicle interior request signal transmitted from the request signal transmission unit; An in-vehicle device further receiving an ID signal transmitted from the ID signal transmission unit, the ID signal transmission unit transmitting a unique ID signal in response to the vehicle interior request signal received by the request signal reception unit An ID signal receiving unit, an ID signal authenticating unit for authenticating an ID signal received by the ID signal receiving unit, and the portable transceiver is in the vehicle interior when the authentication by the ID signal authenticating unit is successful A locking control unit that prohibits locking from outside the vehicle compartment, and the request signal transmission unit is provided integrally with the vehicle seat, and the in-vehicle device further includes: According to the seat position detection unit for detecting both seat positions and the seat position detected by the seat position detection unit, the delivery area of the vehicle interior request signal is an area that does not extend outside the vehicle interior and is the largest in the vehicle interior. A request signal strength control unit that controls the output of the vehicle interior request signal so as to be an area.

The in-vehicle device further includes a distance calculation unit that calculates a distance from the request signal transmission unit integrally provided in the vehicle seat to the outside of the passenger compartment based on the seat position detected by the seat position detection unit, The signal intensity control unit preferably increases the output intensity of the vehicle interior request signal as the distance calculated by the distance calculation unit increases.

The in-vehicle device further includes a request signal auxiliary receiving unit that auxiliaryly receives a vehicle interior request signal transmitted from the request signal transmitting unit, and the request signal strength control unit is a vehicle received by the request signal auxiliary receiving unit. It is preferable to feedback control the output intensity of the vehicle interior request signal according to the reception intensity of the indoor request signal.

  As described above, according to the present invention, it is possible to reduce leakage of signals exchanged when performing electronic authentication to the outside of the passenger compartment and more reliably detect that the portable transceiver is in the passenger compartment. It is possible to provide a keyless entry system capable of

(First embodiment)
Hereinafter, a keyless entry system according to a first embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing an overall configuration of a keyless entry system according to the first embodiment of the present invention. In FIG. 1, a keyless entry system 100 controls locking and unlocking of a vehicle by performing electronic authentication between an in-vehicle device 110 installed in the vehicle and a portable transceiver 120 carried by the user.

  The in-vehicle device 110 includes a seat position detection unit 111, a request signal strength control unit 112, a request signal transmission unit 113, an ID signal reception unit 114, an ID signal authentication unit 115, and a locking control unit 116. The portable transceiver 120 includes a request signal receiver 121 and an ID signal transmitter 122.

  In the in-vehicle device 110, the seat position detection unit 111 is, for example, a position sensor that detects the position of the vehicle seat. The request signal intensity control unit 112 controls the output intensity of the vehicle interior request signal transmitted from the request signal transmission unit 113 according to the seat position detected by the seat position detection unit 111. The request signal transmission unit 113 is integrally installed on each seat of the vehicle, and the position of the request signal transmission unit 113 can be regarded as the same as the position of the seat. The request signal transmission unit 113 transmits a vehicle interior request signal from each seat to the vicinity of the seat.

  In the portable transceiver 120, the request signal receiving unit 121 receives a vehicle interior request signal transmitted from the request signal transmitting unit 113 of the in-vehicle device 110. When the request signal receiving unit 121 receives the vehicle interior request signal, the ID signal transmitting unit 122 transmits a unique ID signal to the in-vehicle device 110.

  In the in-vehicle device 110, the ID signal receiving unit 114 receives the ID signal transmitted from the ID signal transmitting unit 114 of the portable transceiver 120. When the ID signal receiving unit 114 receives the ID signal, the ID signal authentication unit 115 performs electronic authentication of the ID signal. When the ID authentication by the ID signal authentication unit 115 is successful, the lock control unit 116 prohibits locking from outside the vehicle, assuming that the portable transceiver 120 is in the vehicle interior.

  The operation of the keyless entry system 100 according to Embodiment 1 of the present invention will be described below with reference to the flowchart of FIG. In the following example, it is assumed that the user moves the rearmost seat to the rear of the vehicle.

  When the user moves the rearmost seat to the rear of the vehicle, the seat position detection unit 111 detects the position of the rearmost seat (step S201). The sheet position information detected by the sheet position detection unit 111 is input to the request signal intensity control unit 112.

  Next, the request signal strength control unit 112 refers to an output strength table showing a correspondence relationship between the position of the seat held in advance and the output strength of the vehicle interior request signal, and responds based on the input position information of the seat. The output intensity of the vehicle interior request signal is determined (step S202).

  Next, the request signal transmission unit 113 of the in-vehicle device 110 transmits a vehicle interior request signal having the output strength determined by the request signal strength control unit 112 (step S203). The vehicle interior request signal transmitted from the request signal transmitter 113 is received by the request signal receiver 121 of the portable transceiver 120 (step S204).

  Next, when receiving the vehicle interior request signal, the portable transceiver 120 transmits a unique ID signal from the ID signal transmission unit 122 to the in-vehicle device 110 in response to the received vehicle interior request signal (step S205). . The unique ID signal transmitted from the ID signal transmitting unit 122 of the portable transceiver 120 is received by the ID signal receiving unit 114 of the in-vehicle device 110 (step S206).

  Next, when the in-vehicle device 110 receives the unique ID signal, the ID signal authentication unit 115 of the in-vehicle device 110 refers to the ID signal table held in advance and performs ID authentication by collating the received unique ID signal. Then, it is determined whether or not the authentication is successful (step S207).

  If it is determined in step S207 that the authentication is successful, the locking control unit 116 of the in-vehicle device 110 prohibits locking from outside the vehicle, assuming that the portable transceiver 120 is in the vehicle (step S208). On the other hand, when it determines with authentication not having succeeded in step S207, the locking control part 116 of the vehicle-mounted apparatus 110 complete | finishes a process.

  For example, as shown in FIG. 3, at the seat position D1 before the rearmost seat is moved, the output intensity of the vehicle interior request signal is output S1, whereas the seat moved rearward of the vehicle At the position D2, the output intensity of the vehicle interior request signal is determined as the output S2 that is smaller than the output S1.

  As shown in FIG. 4, when the position of the last seat is the seat position D1, the output intensity of the vehicle interior request signal is output S1, and the vehicle interior request delivery area is area A1. At this time, the area A1 is an area that does not extend outside the passenger compartment and is the largest area in the passenger compartment. When the position of the last seat is the seat position D2, the output intensity of the vehicle interior request signal is an output S2 smaller than the output S1, and the vehicle interior request delivery area is the area A2. At this time, the area A2 is an area that does not extend outside the passenger compartment and is the largest area in the passenger compartment.

  Thus, according to the seat position, the output intensity of the vehicle interior request signal is controlled so that the delivery area is an area that does not reach the outside of the vehicle interior and becomes the maximum area in the vehicle interior. Assuming that the transceiver 120 is in the passenger compartment, locking from outside the passenger compartment is prohibited, and when the portable transceiver 120 is in the passenger compartment, it is more reliably detected that the portable transceiver 120 is in the passenger compartment. can do.

  In addition, it is good also as a structure by which the directivity of the output of a vehicle interior request signal is controlled. In this case, even when the seat moves not only in the front-rear direction but also in the left-right direction, the delivery area for the output of the vehicle interior request signal is an area that does not extend outside the vehicle compartment and is controlled to be the largest area in the vehicle interior As a result, the portable transceiver 120 is prohibited from being locked from the outside of the passenger compartment, and when the portable transceiver 120 is in the passenger compartment, the portable transceiver 120 is in the passenger compartment. This can be detected more reliably.

(Second Embodiment)
Hereinafter, a keyless entry system according to the second embodiment of the present invention will be described in detail with reference to the flowchart of FIG. The difference of the present embodiment from the configuration of the first embodiment is that the distance from the position of the request signal transmission unit 113 to the outside of the passenger compartment is calculated based on the seat position detected by the seat position detection unit 111. The in-vehicle device 110 further includes a distance calculation unit.

  When the user moves the rearmost seat to the rear of the vehicle, the seat position detection unit 111 detects the position of the rearmost seat (step S501). The sheet position information detected by the sheet position detection unit 111 is input to the distance calculation unit.

  The distance calculation unit calculates the distance from the position of the request signal transmission unit 113 to the outside of the passenger compartment based on the seat position detected by the seat position detection unit 111 (step S502).

  Next, the request signal strength control unit 112 refers to an output strength table indicating a correspondence relationship between the distance to the outside of the vehicle cabin that is held in advance and the output strength of the vehicle interior request signal. Based on this, the output intensity of the corresponding vehicle interior request signal is determined (step S503). At this time, as the distance calculated by the distance calculation unit increases, the output intensity of the vehicle interior request signal is determined to be larger.

  Next, the request signal transmission unit 113 of the in-vehicle device 110 transmits a vehicle interior request signal having the output strength determined by the request signal strength control unit 112 (step S504). The vehicle interior request signal transmitted from the request signal transmission unit 113 is received by the request signal reception unit 121 of the portable transceiver 120 (step S505).

  Next, when receiving the vehicle interior request signal, the portable transceiver 120 transmits a unique ID signal from the ID signal transmission unit 122 to the in-vehicle device 110 in response to the received vehicle interior request signal (step S506). . The unique ID signal transmitted from the ID signal transmission unit 122 of the portable transceiver 120 is received by the ID signal reception unit 114 of the in-vehicle device 110 (step S507).

  Next, when the in-vehicle device 110 receives the unique ID signal, the ID signal authentication unit 115 of the in-vehicle device 110 refers to the ID signal table held in advance and performs ID authentication by collating the received unique ID signal. Then, it is determined whether or not the authentication is successful (step S508).

  If it is determined in step S508 that the authentication is successful, the locking control unit 116 of the in-vehicle device 110 prohibits locking from outside the vehicle, assuming that the portable transceiver 120 is in the vehicle (step S509). On the other hand, if it is determined in step S508 that the authentication has not been successful, the locking control unit 116 of the in-vehicle device 110 ends the process.

(Third embodiment)
Hereinafter, a keyless entry system according to the third embodiment of the present invention will be described in detail with reference to the flowchart of FIG. The difference of the present embodiment from the configuration of the first embodiment is that the in-vehicle device 110 further includes a request signal auxiliary receiving unit that auxiliaryly receives a vehicle interior request signal.

  When the user moves the rearmost seat to the rear of the vehicle, the seat position detection unit 111 detects the position of the rearmost seat (step S601). The sheet position information detected by the sheet position detection unit 111 is input to the request signal intensity control unit 112.

  The request signal auxiliary receiving unit auxiliaryly receives the vehicle interior request signal (step S602). The auxiliary reception intensity information of the vehicle interior request signal received by the request signal auxiliary reception unit is input to the request signal intensity control unit 112.

  Next, the request signal strength control unit 112 refers to an output strength table indicating the correspondence between the position of the seat held in advance and the auxiliary reception strength and the output strength of the vehicle interior request signal, and the position information of the input seat Based on the auxiliary reception intensity information, the output intensity of the corresponding vehicle interior request signal is determined (step S603).

  Next, the request signal transmission unit 113 of the in-vehicle device 110 transmits a vehicle interior request signal having the output strength determined by the request signal strength control unit 112 (step S604). The vehicle interior request signal transmitted from the request signal transmission unit 113 is received by the request signal reception unit 121 of the portable transceiver 120 (step S605).

  Next, when receiving the vehicle interior request signal, the portable transceiver 120 transmits a unique ID signal from the ID signal transmission unit 122 to the in-vehicle device 110 in response to the received vehicle interior request signal (step S506). . The unique ID signal transmitted from the ID signal transmitting unit 122 of the portable transceiver 120 is received by the ID signal receiving unit 114 of the in-vehicle device 110 (step S607).

  Next, when the in-vehicle device 110 receives the unique ID signal, the ID signal authentication unit 115 of the in-vehicle device 110 refers to the ID signal table held in advance and performs ID authentication by collating the received unique ID signal. Then, it is determined whether or not the authentication is successful (step S608).

  If it is determined in step S608 that the authentication is successful, the locking control unit 116 of the in-vehicle device 110 prohibits locking from outside the vehicle, assuming that the portable transceiver 120 is in the vehicle (step S609). On the other hand, when it determines with authentication not having succeeded in step S608, the locking control part 116 of the vehicle-mounted apparatus 110 complete | finishes a process.

  The output intensity of the vehicle interior request signal may be determined based on the voltage, the duty of the voltage, and the current input from the request signal intensity controller 112 to the request signal transmitter 113, or the request signal intensity controller A switchable resistor may be provided in 112 and may be determined by switching the resistance value.

  As described above, according to the present invention, it is possible to reduce leakage of signals exchanged when performing electronic authentication to the outside of the passenger compartment and more reliably detect that the portable transceiver is in the passenger compartment. It is possible to provide a keyless entry system capable of

  The configurations described in the above embodiments are merely specific examples and do not limit the technical scope of the present invention. Any configuration can be employed within the scope of the effects of the present application.

  INDUSTRIAL APPLICABILITY The present invention is useful as a keyless entry system or the like that controls locking / unlocking of a vehicle by performing electronic authentication between an in-vehicle device installed in the vehicle and a portable transceiver carried by the user.

The block diagram which shows the whole structure of the keyless entry system which concerns on the 1st Embodiment of this invention The flowchart which shows operation | movement of the keyless entry system which concerns on the 1st Embodiment of this invention The figure which shows the relationship between the seat position and the output intensity of the vehicle interior request signal Schematic diagram showing the output of the vehicle interior request signal according to the seat position The flowchart which shows operation | movement of the keyless entry system which concerns on the 2nd Embodiment of this invention The flowchart which shows operation | movement of the keyless entry system which concerns on the 3rd Embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Keyless entry system 110 In-vehicle apparatus 111 Seat position detection part 112 Request signal strength control part 113 Request signal transmission part 114 ID signal reception part 115 ID signal authentication part 116 Locking control part 120 Portable transceiver 121 Request signal reception part 122 ID signal Transmitter

Claims (3)

A keyless entry system that controls locking and unlocking of a vehicle by performing electronic authentication between an in-vehicle device installed in the vehicle and a portable transceiver carried by the user,
The in-vehicle device is
Including a request signal transmitter for transmitting a vehicle interior request signal;
The portable transceiver is:
A request signal receiver for receiving a vehicle interior request signal transmitted from the request signal transmitter;
An ID signal transmission unit that transmits a unique ID signal in response to the vehicle interior request signal received by the request signal reception unit;
The in-vehicle device further includes
An ID signal receiving unit for receiving an ID signal transmitted from the ID signal transmitting unit;
An ID signal authenticating unit for authenticating an ID signal received by the ID signal receiving unit;
A lock control unit that prohibits locking from outside the vehicle as the portable transceiver is in the vehicle interior when the authentication by the ID signal authentication unit is successful,
The request signal transmission unit is provided integrally with the seat of the vehicle,
The in-vehicle device further includes
A seat position detector for detecting the seat position of the vehicle;
In accordance with the seat position detected by the seat position detection unit, the vehicle interior request signal is set so that the delivery area of the vehicle interior request signal is an area that does not extend outside the vehicle interior and is the largest area in the vehicle interior. And a request signal strength control unit for controlling the output of the keyless entry system. The in-vehicle device is
Based on the seat position detected by the seat position detector, further includes a distance calculator that calculates a distance from the request signal transmitter integrally provided in the vehicle seat to the outside of the passenger compartment,
2. The keyless entry system according to claim 1, wherein the request signal strength control unit increases the output strength of the vehicle interior request signal as the distance calculated by the distance calculation unit increases. The in-vehicle device is
A request signal auxiliary receiving unit for auxiliary receiving a vehicle interior request signal transmitted from the request signal transmitting unit;
The request signal intensity control unit feedback-controls the output intensity of the vehicle interior request signal according to the reception intensity of the vehicle interior request signal received by the request signal auxiliary reception unit. 2. A keyless entry system according to 2.

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