JP2012237133A - On-vehicle electronic key system, on-vehicle device, and portable key - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-vehicle electronic key system capable of preventing the runout of a battery during parking, without impairing drivers' conveniences.SOLUTION: An on-vehicle device 8 to be mounted on a vehicle 1 includes a switch 3 for connecting a battery 7 to equipment which consumes electric power in the on-vehicle device 8, and for disconnecting the battery 7 from the equipment when power supply to itself is stopped, a power receiving device 2 for receiving the power in a no-contact system, and for supplying the power to the switch 3 when receiving the power and stopping the power supply to the switch 3 when stopping receiving the power, and an on-vehicle transmitter-receiver 5 for receiving radio signals using the power supplied from the battery 7. A portable key 9 includes a power transmitter 10 for transmitting the power to the on-vehicle device, and an on-portable-key transmitter-receiver 14 for transmitting the radio signals.

Description

  The present invention relates to an in-vehicle electronic key system.

  A keyless entry system that locks and unlocks a door lock of a vehicle using a portable electronic key using wireless communication is known. For example, a system that locks the door of the vehicle when the lock button provided on the portable electronic key is pressed and unlocks when the unlock button is pressed, or a driver with the portable electronic key attaches to the vehicle. A system is known that automatically unlocks when approaching, and automatically locks when leaving the vehicle.

  Furthermore, in a keyless entry system that locks and unlocks a vehicle door using a portable electronic key, a technique for suppressing power consumption on the vehicle side has also been studied (for example, see Patent Document 1 below).

JP 2003-155858 A

  However, the keyless entry system described in Patent Document 1 constantly monitors whether or not an object has approached during parking, and thus continues to consume power during parking. Therefore, there has been a problem that the battery of the vehicle will increase when the vehicle is parked for a long time.

  The present invention has been made in view of the above, and allows driving of a vehicle with a portable electronic key when the driver approaches while parking without consuming the battery power of the vehicle. It is an object of the present invention to obtain an in-vehicle electronic key system that can prevent a battery from being parked without deteriorating the convenience of the user.

  In order to solve the above-described problems and achieve the object, the present invention provides an in-vehicle electronic key system including an in-vehicle device mounted on a vehicle and a portable key that transmits a radio signal to the in-vehicle device. The vehicle-mounted device connects a battery mounted on the vehicle and a device that consumes power in the vehicle-mounted device when power is supplied to the device, and when power supply to the device stops, A switch that disconnects the battery from the device, a power receiving device that receives power by a non-contact method, supplies power to the switch when power is received, and stops power supply to the switch when power reception stops; A vehicle-mounted transmission / reception device that receives the wireless signal using power supplied from the battery, wherein the portable key transmits power to the in-vehicle device, and the wireless And a portable key mounted transceiver for transmitting items, characterized in that.

  The vehicle-mounted electronic key system according to the present invention enables the operation of the vehicle from the portable electronic key when the driver approaches while parking without consuming the battery power of the vehicle. There is an effect that it is possible to prevent the battery from being parked while parking.

FIG. 1 is a diagram illustrating a configuration example of an in-vehicle electronic key system according to the first embodiment. FIG. 2 is a flowchart showing an example of the operation of the first embodiment when the vehicle is stopped. FIG. 3 is a flowchart showing an example of the operation of the first embodiment when boarding. FIG. 4 is a diagram illustrating a configuration example of the in-vehicle electronic key system according to the second embodiment. FIG. 5 is a diagram illustrating a configuration example of the in-vehicle electronic key system according to the third embodiment.

  Embodiments of an in-vehicle electronic key system according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a diagram showing a configuration example of Embodiment 1 of an in-vehicle electronic key system according to the present invention. As shown in FIG. 1, the in-vehicle electronic key system according to the present embodiment includes an in-vehicle device 8 mounted on a vehicle 1 and a portable key 9. The vehicle 1 is equipped with a battery 7.

  The in-vehicle device 8 connects the power receiving device 2 to the battery 7 and devices that consume power while the power is being supplied from the power receiving device 2 (such as the vehicle-mounted transmission / reception device 5, the unlocking control unit 4). When power supply from the device 2 is stopped, a switch 3 that disconnects the battery 7 and the device that consumes power, an unlocking control unit 4, a vehicle-mounted transmission / reception device 5, and an antenna 6 are provided. The power receiving device 2 includes a vehicle side coil 21 and a rectifier 22. The portable key 9 includes a power transmission device 10, a battery 13, a portable key-mounted transmission / reception device 14, and an antenna 15. The power transmission device 10 includes a portable key side coil 11 and an AC generator 12. The power transmission device 10 and the portable key mounted transmission / reception device 14 are supplied with power from the battery 13.

  Next, the operation of the present embodiment will be described. First, the operation when the vehicle 1 stops will be described. FIG. 2 is a flowchart showing an example of the operation of the present embodiment when the vehicle is stopped. In the initial state, it is assumed that the switch 3 is not supplied with power from the power receiving device 2 and is in an off state (the battery 7 and the device that consumes power are disconnected). When the vehicle 1 is parked and the engine is stopped (step S1), the vehicle-mounted transmission / reception device 5 transmits a signal indicating that the engine has stopped via the antenna 6 to the portable key 9 as a radio wave 101 (step S2). In the portable key 9, the portable key-mounted transmission / reception device 14 receives this signal via the antenna 15, and instructs the power transmission device 10 to start power supply to the vehicle 1. The power transmission device 10 is based on this instruction. Then, power supply is started, and the power receiving device 2 of the vehicle 1 supplies power to the switch 3 by supplying power from the power transmission device 10 (step S3). Thereby, the switch 3 is turned on, and the battery 7 and the device that consumes power are connected.

  Note that a non-contact method is used as a method of supplying power to the vehicle 1 away from the portable key 9. Non-contact power supply methods using, for example, electromagnetic induction or microwaves are known. FIG. 1 shows a method by electromagnetic induction. By flowing an alternating current output from the AC generator 12 of the power transmission device 9 to the portable key side coil 11, the magnetic field 100 around the portable key side coil 11 is changed. The magnetic field around the vehicle side coil 21 of the vehicle 1 also changes due to the change in the magnetic field. As a result, a current is generated in the vehicle side coil 21. The current generated by the vehicle side coil 21 is rectified by the rectifier 22 and supplied to the switch 3.

  And the driver | operator of the vehicle 1 leaves | separates from the vehicle 1 with holding | maintaining the portable key 9, and electric power is no longer supplied to the vehicle 1 from the portable key 9 (the change of the magnetic field by the portable key side coil 11 is the periphery of the vehicle side coil 21). (Step S4), when it is detected that the switch 3 is switched from power to no switch (Yes in Step S5), the switch 3 is turned off and the battery 7 is powered. (Step S6). In addition, when the switch 3 does not detect that the switch 3 is in the no switch state due to the power (No in step S5), step S5 is repeated. Note that the switch 3 is configured by a relay, for example.

  Next, the operation when the driver gets on will be described. FIG. 3 is a flowchart showing an example of the operation of the present embodiment during boarding. It is assumed that the driver holding the portable key 9 is away from the vehicle 1 to some extent, and the battery 7 is disconnected from the device that consumes power as described above (step S11). From this state, when the driver holding the portable key 9 approaches the vehicle 1 more than a certain degree (step S12), power is supplied from the power transmitting device 10 of the portable key 9 to the power receiving device 2 of the vehicle 1 (step S13). As a result, power is supplied to the switch 3 from the power receiving device 2, the switch 3 is turned on, and the connection between the battery 7 and the device that consumes the power is restored (step S14). Moreover, the portable key mounting transmission / reception device 14 of the portable key 9 transmits a key code for performing authentication stored in advance in the vehicle mounting transmission / reception device 5 of the vehicle 1 (step S15).

  The vehicle-mounted transmission / reception device 5 of the vehicle 1 collates the key code received from the portable key 9 with the key code held in advance, and determines whether or not they match (step S16). When both match (step S16 Yes), the vehicle-mounted transmission / reception device 5 instructs the unlocking control unit 4 to unlock the door of the vehicle 1, and the unlocking control unit 4 unlocks based on the instruction ( Step S17).

  If the two do not match (No in step S16), unlocking is not performed, and if the holder of a different mobile key (the holder of the mobile key that transmitted the key code that does not match) leaves the vehicle 1 (step S18), the mobile key No power is supplied from 9, and the process returns to step S11 to turn off the switch 3 and disconnect from the device that consumes power.

  In addition, as a process at the time of a stop, after the driver | operator leaves the vehicle 1 after step S3 (step S4), the vehicle 1 is often locked. When locking is performed, a locking process is performed between step S3 and step S4. The locking process may use any procedure that is normally performed in a keyless system. For example, when the key code matches the key code, as in steps S15 to S17 in the unlocking process. To lock.

  As described above, in the present embodiment, the portable key 9 includes the power transmission device 10 and starts power transmission from the power transmission device 10 when the vehicle 1 is parked. The in-vehicle device 8 mounted on the vehicle 1 includes a power receiving device 2, a battery 7, and a switch 3 connected to the power receiving device 2. The power receiving device 2 supplies power to the switch 3 when power is supplied from the power transmitting device 10. The switch 3 connects the battery 7 and a device that consumes power while power is being supplied from the power receiving device 2, and a device that consumes power from the battery 7 when power supply from the power receiving device 2 is stopped And to separate. For this reason, the vehicle 1 may be unlocked using the portable key 9 when the driver approaches while parking without consuming the power of the battery 7 of the vehicle 1. That is, it is possible to prevent the battery from running out while parking without impairing the convenience of the driver.

Embodiment 2. FIG.
FIG. 4 is a diagram showing a configuration example of Embodiment 2 of the in-vehicle electronic key system according to the present invention. As shown in FIG. 4, the in-vehicle electronic key system according to the present embodiment includes an in-vehicle device 8 similar to that in the first embodiment, and a portable key 9a. The vehicle 1 is equipped with a battery 7. Components having the same functions as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof is omitted.

  The portable key 9a of the present embodiment is the same as the portable key 9 of the first embodiment, except that the secondary battery 16 and the power generation device 17 are provided instead of the battery 13 of the portable key 9 of the first embodiment.

  In the first embodiment, the battery 13 that is a power source mounted on the portable key 9 is a primary battery, and there is a problem that the vehicle 1 cannot be unlocked / locked when the battery 13 runs out. In the present embodiment, by using a photovoltaic power generation device using a photovoltaic power generation device or a device that changes vibration or rotational force using a piezoelectric element as power generation device 17 as the power generation device 17, the vehicle 1 is unlocked due to battery exhaustion.・ Prevents locking from becoming impossible.

  The mobile unlocking operation of the present embodiment when the battery runs out will be described. In the state of running out of the battery, even if the driver holding the portable key 9a approaches the vehicle 1, power is not supplied from the portable key 9a to the vehicle 1, so that the unlocking is not performed.

  For example, when the power generation device 17 of the portable key 9 a is a photovoltaic power generation device, the driver shines light on the light receiving portion of the power generation device 17 (photovoltaic power generation device) and waits for the electric power to be stored in the secondary battery 16. When the power generation device 17 of the portable key 9a is a power generation device using a piezoelectric element, the power generation by the power generation device 17 using the piezoelectric element is performed by shaking the portable key 9a or rotating a lever. Wait for power to be stored in the secondary battery 16. Thereafter, electric power is supplied from the portable key 9a to the vehicle 1, and the unlocking operation is performed as in the first embodiment. The operation of this embodiment other than when the battery runs out is the same as that of the first embodiment.

  In the case where the power generation device 17 is a power generation device using a piezoelectric element, as long as the power generation device 17 can generate power by vibration while the driver is walking, the battery will not run out in the first place.

  As described above, in the present embodiment, the portable key 9a includes the secondary battery 16 and the power supply device 17 so that power can be recovered by power generation even when the battery runs out. For this reason, the same effects as those of the first embodiment can be obtained, and the unlocking and locking of the vehicle 1 can be performed even when the battery runs out.

Embodiment 3 FIG.
FIG. 5 is a diagram showing a configuration example of Embodiment 3 of the in-vehicle electronic key system according to the present invention. As shown in FIG. 5, the on-vehicle electronic key system of the present embodiment includes an on-vehicle device 8a and a portable key 9b. The vehicle 1 is equipped with a battery 7. Components having the same functions as those of the second embodiment are denoted by the same reference numerals as those of the second embodiment, and description thereof is omitted.

  The in-vehicle device 8a of the present embodiment is the same as the power receiving device 2 of the first embodiment except that the power receiving device 2 of the first embodiment is replaced with the power transmitting / receiving device 2a. The portable key 9b of the present embodiment is the same as the portable key 9a of the second embodiment, except that the power generation device 17 of the portable key 9a of the second embodiment is deleted and the power transmission device 10 is replaced with the power transmission / reception device 10a. .

  In the second embodiment, the secondary battery 16 mounted on the portable key 9a can be charged from the power generation device 17, but the place where there is no strong light or the portable key 9a is kept stationary. In this case, the battery runs out. In the present embodiment, the secondary battery 16 of the portable key 9a can be charged by enabling power transmission from the in-vehicle device 8a to the portable key 9b.

  In the present embodiment, during the locking / unlocking operation, as in the first embodiment, the power transmitting / receiving device 10a transmits power and the power transmitting / receiving device 2a receives power. On the other hand, when the vehicle 1 is traveling, in the in-vehicle device 8a of the vehicle 1, the alternating current generator 23 causes the alternating current to flow through the vehicle side coil 21 of the power transmitting / receiving device 2a by the power of the battery 7 to the portable key 9b. Power transmission. In the portable key 9b, power is received by the portable key side coil 11 and the rectifier 18 of the power transmission / reception device 10a, and the secondary battery 16 is charged. The operations of the present embodiment other than those described above are the same as those of the second embodiment.

  As described above, in the present embodiment, the in-vehicle device 8a includes the power transmission / reception device 2a, and the portable key 9b includes the power transmission / reception device 10a. When the vehicle 1 is running, the power transmission / reception device 2a transmits the power of the battery 7 using the portable key 9b, and the secondary battery 16 of the portable key 9b is charged. For this reason, the same effect as Embodiment 1 can be obtained, and the portable key can be prevented from running out of battery.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Power receiving apparatus 2a, 10a Power transmission / reception apparatus 3 Switch 4 Unlocking control part 5 Vehicle-mounted transmission / reception apparatus 6,15 Antenna 7 Battery 8 Car-mounted apparatus 9, 9a, 9b Portable key 10 Power transmission apparatus 11 Portable key side coil 12, 23 AC generator 13 Battery 14 Mobile key mounting transceiver 16 Secondary battery 17 Power generator 18 Rectifier 21 Vehicle side coil 22 Rectifier 23 AC generator

Claims (10)

An in-vehicle electronic key system comprising an in-vehicle device mounted on a vehicle and a portable key that transmits a radio signal to the in-vehicle device,
The in-vehicle device is
A switch that connects a battery mounted on the vehicle and a device that consumes power in the in-vehicle device when power is supplied to the device, and disconnects the battery and the device when power supply to the device stops When,
A power receiving device that receives power by a non-contact method, supplies power to the switch when power is received, and stops power supply to the switch when power reception is stopped;
A vehicle-mounted transceiver device that receives the wireless signal using power supplied from the battery;
With
The portable key is
A power transmission device that sends power to the in-vehicle device; and
A portable key-mounted transmission / reception device for transmitting the radio signal;
An on-vehicle electronic key system comprising: The power transmission device performs power transmission by electromagnetic induction,
The on-vehicle electronic key system according to claim 1, wherein the power receiving device receives power by electromagnetic induction. The portable key is
Primary battery,
With
The in-vehicle electronic key system according to claim 1, wherein the power transmission device operates with electric power supplied from the primary battery. The portable key is
A secondary battery,
A power generation device for generating power and charging the secondary battery with the generated power;
With
The in-vehicle electronic key system according to claim 1, wherein the power transmission device is operated by electric power supplied from the secondary battery.   The on-vehicle electronic key system according to claim 4, wherein the power generation device is a photovoltaic power generation device.   The in-vehicle electronic key system according to claim 4, wherein the power generation device is a power generation device using a piezoelectric element. The portable key is
Secondary battery,
With
The power receiving device has a power transmission function for transmitting power,
The power transmission device receives power transmitted from the power reception device, charges the secondary battery with the received power,
The in-vehicle electronic key system according to claim 1, wherein the power transmission device is operated by electric power supplied from the secondary battery.   The in-vehicle electronic key system according to any one of claims 1 to 7, wherein the power transmission device starts power transmission when the vehicle stops. An in-vehicle device that receives a radio signal from a portable key that transmits a radio signal,
A switch that connects a battery mounted on the vehicle and a device that consumes power in the in-vehicle device when power is supplied to the device, and disconnects the battery and the device when power supply to the device stops When,
A power receiving device that receives power transmitted from the portable key in a non-contact manner, supplies power to the switch when power is received, and stops power supply to the switch when power reception is stopped;
A vehicle-mounted transceiver device that receives the wireless signal using power supplied from the battery;
A vehicle-mounted device comprising: A portable key that transmits a radio signal to an in-vehicle device mounted on a vehicle,
A power transmission device that sends power to the in-vehicle device; and
A portable key-mounted transmission / reception device for transmitting the radio signal;
A portable key characterized by comprising:

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