JP4488343B2 - Passive entry system - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a passive entry system that wirelessly transmits unique information from a portable means carried by a driver, and sets the engine in a startable state when the portable means is authenticated by authentication by the authentication means. Is.

  As a conventional vehicle antitheft system, for example, a passive entry system disclosed in Patent Document 1 is known. Such a passive entry system includes a portable means that can be carried by a driver and capable of transmitting unique information by high-frequency radio waves, and is arranged on the vehicle side to receive a transmission from a transmission means. Authentication means for authenticating whether the mobile device is authentic, and if the authentication means authenticates the portable means, the power can be supplied to a predetermined electrical component of the vehicle and the engine can be started It was mainly composed of control means for setting the state.

With the above configuration, when the driver carrying the portable means approaches the vehicle, authentication is performed by the authenticating means, and electric power is supplied to predetermined electrical components included in the vehicle so that the engine can be started. That is, when the portable means enters the receivable range (the reach of radio waves from the portable means) of the authentication means, power is automatically supplied to the electrical components of the vehicle, and the information transmitted from the authentication means is Based on this, since it is authenticated whether or not the approaching portable means is genuine, it is possible to improve the operability and prevent the vehicle from being stolen.
Japanese Patent Laid-Open No. 2003-13644

  However, in the above-described conventional passive entry system, since it is necessary to transmit unique information to the vehicle side from the portable means by high frequency radio waves, the portable means includes a small portable power source such as a button battery. However, if the button battery or the like is consumed and power is not supplied, even if the driver carrying the portable means approaches the vehicle, authentication by the authentication means is not performed, and the engine may be in a startable state. There was a problem that I could not.

  The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a passive entry system capable of performing authentication by an authentication unit even when a power source disposed in a portable unit is consumed.

The invention according to claim 1 is provided in a two-wheeled vehicle, can transmit radio waves having specific information, and can receive radio waves from the transmission means while being made portable by the driver. Portable means capable of transmitting radio waves having specific information based on reception of radio waves, receiving means for receiving radio waves transmitted from the portable means, and information on radio waves received by the receiving means If the comparison is made with the information and if both match, the authentication means can authenticate that the portable means is authentic, and if the authentication means authenticates the portable means, the motorcycle In a passive entry system comprising a control means for supplying power to predetermined electrical components included in the engine and enabling the engine to start, the portable means generates power by means of radio waves transmitted from the transmission means. And the authentication means performs the authentication after the motorcycle engine is started, and if the authentication is lost before the engine stops, the portable means is recognized as lost. And an informing means for informing that the key has been lost .

According to a second aspect of the present invention, in the passive entry system according to the first aspect, the authentication unit and the control unit are supplied with electric power from a battery provided in a motorcycle, and the authentication unit and the control unit are replaced with the battery. An external connection type power supply means capable of supplying electric power can be connected.

According to the first aspect of the present invention, since the portable means is equipped with a transponder that can generate electric power from the radio wave from the transmission means arranged in the two-wheeled vehicle, even if the power supply arranged in the portable means is exhausted, authentication is performed. Authentication by means can be performed. Further, since the notification means notifies that the portable means has been lost while the engine of the two-wheeled vehicle is being started, it is possible to avoid problems at the time of restart due to stopping the engine while the portable means is lost. it can.

According to the invention of claim 2, since the external connection type power supply means that can supply power to the authentication means and the control means can be connected, even when the battery of the motorcycle is exhausted, the authentication means and the control means. For example, it is possible to take measures such as charging the battery and moving the two-wheeled vehicle.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
The passive entry system according to the present embodiment wirelessly transmits unique information from the portable means carried by the driver, and starts the motorcycle engine when the portable means authenticates by authentication by the authentication means. As shown in FIG. 1 and FIG. 2, the portable device 1 is mainly composed of a portable means 1 carried by the driver and a communication unit 9 mounted on the vehicle.

  The portable means 1 consists of what was formed in the card | curd type | mold so that a driver | operator could carry, and as shown in FIG. 1, button battery 2, IC3, low frequency receiving antennas 4a-4c, communication The unit 5 is mainly composed of a high-frequency transmission antenna 6, a reaction switch S, and a transponder 8. The portable means 1 operates by supplying power from the button battery 10 in normal times.

  The low frequency receiving antennas 4a to 4c can receive radio waves (low frequency including specific information such as random numbers) transmitted from a low frequency transmitting antenna 15 of the communication unit 9 to be described later. , Y, z directions) can receive low frequencies. The low frequency signals received by the low frequency receiving antennas 4a to 4c are amplified and demodulated by the communication unit 5 and sent to the IC 3, and the IC 3 to which the signal is sent has a predetermined information having unique information. An answer signal is created, and the answer signal is transmitted from the high-frequency transmitting antenna 6 via the transmitter 7.

  The answer signal created by the IC 3 is a predetermined calculation (equal to the calculation stored in the CPU 10 of the communication unit 9) for low frequency information (random numbers) received by the low frequency receiving antennas 4a to 4c. It is preferable to further improve the crime prevention effect. The reaction switch S is formed of, for example, a push button switch provided at a predetermined position of the portable means 1. When the reaction switch S is turned on by pressing the push button, a predetermined signal is transmitted from the high frequency transmission antenna 6. When the communication unit 9 receives it, the hazard of the vehicle blinks a predetermined number of times so that a so-called answer call can be performed.

  Here, the portable means 1 according to the present embodiment is provided with a transponder 8 capable of generating electric power from radio waves transmitted from the communication unit 9 (specifically, the low-frequency transmission antenna 15). Specifically, the transponder 8 has a capacitor (not shown) inside, and when the low frequency transmitted from the low frequency transmitting antenna 15 is received as a power signal, the capacitor is charged as a secondary battery. It has become so.

  Since the transponder 8 is configured to operate with this charged power, even when the button battery 2 is consumed, the portable means 1 can be brought close to a predetermined position of the motorcycle (for example, in the vicinity of the communication unit 9). The communication with the communication unit 9 by the transponder 8 can be performed.

  On the other hand, as shown in FIG. 2, a communication unit 9 capable of wireless communication with the portable means 1 is mounted on the vehicle side. The communication unit 9 mainly includes a CPU 10, a power supply control unit 11, a high frequency receiving antenna 13 as a receiving unit, a low frequency transmitting antenna 15 as a transmitting unit, and an EPROM 16. Among these, the CPU 10 includes an authentication unit 17 and a control unit 18, and the power supply control unit 11 includes a power supply stop circuit 20.

  The power control unit 11 is supplied with power from a battery BT provided in the vehicle, and supplies power for the operation of the CPU 10 (that is, the communication unit 9) as a direct current of a predetermined voltage value. The switch is electrically connected to an on switch 22 and an off switch 23 that are disposed at 21. However, the power supply controller 11 supplies power to the CPU 10 by pressing the on switch 22.

  The low-frequency transmission antenna 15 is capable of transmitting radio waves (low frequency) having specific information (for example, a random number acquired by the CPU 10) to the portable means 1 side. When power is supplied to the CPU 10, a radio wave having specific information is transmitted via the communication unit 14 at a predetermined timing. When this low frequency signal is received by any of the low frequency receiving antennas 4a to 4c of the portable means 1, an answer signal is transmitted from the high frequency transmitting antenna 6 of the portable means 1 as described above. .

  That is, when the driver carrying the portable means 1 approaches the reach of the radio wave transmitted from the low frequency transmission antenna 15, the high frequency transmission antenna 6 can transmit an answer signal having unique information. Thus, the answer signal is received by the high-frequency receiving antenna 13 on the communication unit 9 side. When the answer signal is received by the high-frequency receiving antenna 13, the signal is sent to the authentication means 17 of the CPU 10 via the RF unit 12. When the button battery 2 is exhausted, if the portable means 1 is brought close to a predetermined position of the motorcycle and the on switch 22 is pressed, an answer signal having unique information is transmitted from the transponder 8.

  The authenticating means 17 compares the unique information (for example, the received random number obtained by performing a predetermined operation) with the predetermined information, and if the two match, the authentication signal 17 The transmitting portable means 1 (that is, the portable means 1 carried by the approaching driver) is recognized as a regular one. If the two do not match, it is recognized that the portable means 1 is not genuine, and control by the control means 18 described later is not performed.

  Further, information specific to the answer signal and predetermined information to be authenticated are stored in the EPROM 16 connected to the CPU 10. The EPROM 16 can store a plurality of information in advance, and can further store information on a spare portable means using a master key (not shown). For example, it is preferable that after performing a predetermined operation in a state where the master key is close to the communication unit 9, another portable means to be reserved is brought close and the information can be written in the EPROM 16. .

  When the authentication unit 17 recognizes that the portable unit 1 is genuine, the control unit 18 supplies power to predetermined electrical components included in the motorcycle. Examples of electrical components to which such electric power is supplied include a meter panel 21, a right blinker relay 25, and a left blinker relay 26 (when the hazard is set to blink to notify the authentication), and a headlight relay 27 (always). A steering lock 28 and a seat lock 29 (both of which are driving sources for performing a locking operation).

  As a result, the driver carrying the regular portable means 1 simply presses the on button 22 to turn it on and power is supplied to various electrical components, releasing the steering lock 28 and releasing the seat lock 29. Since the release state is set, the operability can be remarkably improved as compared with the conventional case where the ignition switch is rotated and operated.

  Furthermore, in addition to the above power supply, the control means 18 transmits an engine start permission signal to the ECU 19 included in the motorcycle, so that the engine can be started. In other words, the engine can be started by operating the cell starter switch of the two-wheeled vehicle in such a startable state. Thereby, since the engine cannot be started unless the driver carries the regular portable means 1, the crime prevention effect can be enhanced.

  In the present embodiment, the low-frequency signal is continuously transmitted from the low-frequency transmission antenna 15 even after the engine is ready to start, and the engine stops after the engine is started. The authentication means 17 is configured to perform authentication until this time. That is, until the engine is stopped, if the high-frequency receiving antenna 13 does not receive the answer signal from the portable means 1, authentication by the authentication means 17 will not be performed. It can be recognized that the portable means 1 has been lost.

  When the CPU 10 detects such a state, the key loss display lamp 24 (notification means) disposed on the meter panel 21 can be blinked or lit. As a result, the driver can recognize that the portable means 1 has been lost while the engine is being driven, and a malfunction caused by stopping the engine (for example, when the engine is stopped in a place where the motorcycle cannot be stopped for a long time, The engine cannot be started again and transport by a transport vehicle or the like becomes necessary.

  Further, in the present embodiment, emergency power connection means 30 that can connect an external connection type power supply means such as a 9V battery to the power control unit 11 is formed. The emergency power supply connection means 30 can supply power to the CPU 10 (that is, the authentication means 17 and the control means 18) instead of the battery BT, and can connect a 9V dry battery or the like when the battery BT is exhausted. Alternatively, a 9V dry battery or the like may be connected in advance so that the power supply control unit 11 can be switched to supply power when the battery BT is consumed.

  Thus, even when the battery of the vehicle is exhausted, power can be supplied to the authentication unit 17 and the control unit 18, and for example, measures such as charging the battery BT or moving the vehicle can be taken. Can do. That is, when the battery BT is depleted, authentication by the authentication unit 17 and power supply by the control unit 18 are not performed, so that the locked state by the steering lock 28 is maintained and the movement of the two-wheeled vehicle becomes difficult, and the seat lock 29 Since the locked state is maintained, the seat cannot be opened, and the charging operation of the battery BT becomes difficult. To avoid this, power is supplied to the CPU 10 as soon as possible.

  On the other hand, when the off switch 23 provided on the meter panel 21 is pressed, the motorcycle engine is stopped and the steering lock 28 and the seat lock 29 are locked. At this time, the communication unit 9 waits for an operation on the ON switch 22 again and is in a reception waiting state by the high frequency receiving antenna 13. That is, in order to wait for reception by the high frequency receiving antenna 13, the CPU 10 is always supplied with power even after the engine is stopped.

  Therefore, in the present embodiment, the power supply stop circuit 20 formed in the power supply control unit 11 measures the time from the engine stop by the operation of the off switch 23, and when the stop time reaches a predetermined time, the power supply control unit 11 Is configured to stop the power supply from the battery, so that the consumption of the battery BT can be suppressed. If the ON switch 22 is pressed in a state where the power supply from the power supply control unit 11 is stopped after a predetermined time has elapsed, the power supply from the power supply control unit 11 is performed again, and a series of controls as described above are performed. It has been made.

  Although the present embodiment has been described above, the present invention is not limited to this. For example, a CAN (controller area network: in-vehicle LAN) in which a CPU of a communication unit is formed in a vehicle via an external I / O or the like. It is good also as what connected and shared vehicle body information. According to this configuration, the communication unit can grasp the locked state of the steering lock, the seat lock, and further the fuel cap via the CAN, and this can be reflected in the control by the control means.

Further, in this embodiment, the loss of the portable means is notified by the lost key display lamp, but instead of this, or in addition to this, other notifying means (sounding a predetermined buzzer, warning by sound) Etc.). Furthermore, the arrangement part of the on switch and the off switch is not limited to the meter panel, and may be another part .

The portable means is equipped with a transponder that can generate power by means of radio waves from the transmission means, and authentication by the authentication means is performed even after the engine of the motorcycle is started, and there is no authentication until the engine stops. In this case, as long as it is provided with a notification means for notifying that the portable means has been lost and notifying the key loss, the present invention can also be applied to a passive entry system to which other functions are added.

The block diagram which shows the portable means in the passive entry system which concerns on embodiment of this invention The block diagram which shows the communication unit (vehicle side system) in the passive entry system

Explanation of symbols

1 Portable means 2 Button battery 3 IC
4a to 4c Low-frequency receiving antenna 5 Communication unit 6 High-frequency transmission antenna 7 Transmitting unit 8 Transponder 9 Communication unit 10 CPU
11 Power Control Unit 12 RF Unit 13 High Frequency Receiving Antenna (Receiving Means)
14 Communication unit 15 Low frequency transmission antenna (transmission means)
16 EPROM
17 Authentication means 18 Control means 19 ECU
20 Power Supply Stop Circuit 21 Meter Panel 22 On Switch 23 Off Switch 24 Key Loss Display Lamp (Notification Means)
25 Relay for right side winker 26 Relay for left side winker 27 Relay for headlight 28 Steering lock 29 Seat lock 30 Emergency power connection means BT Battery S Reaction switch

Claims (2)

A transmission means disposed on the two-wheeled vehicle and capable of transmitting a radio wave having specific information;
Portable means capable of receiving radio waves from the transmission means while being made portable by the driver, and capable of transmitting radio waves having specific information based on reception of the radio waves;
Receiving means for receiving radio waves transmitted from the portable means;
Comparing the information of the radio wave received by the receiving means with predetermined information, and authenticating means that can authenticate that the portable means is genuine when they match,
Control means for supplying power to a predetermined electrical component included in the motorcycle and starting the engine when the portable means is authenticated by the authentication means;
In a passive entry system with
The portable means includes a transponder that can generate electric power by radio waves transmitted from the transmission means, and performs authentication by the authentication means even after the engine of the motorcycle is started, until the engine stops. A passive entry system comprising an informing means for recognizing that the portable means has been lost and notifying that the key has been lost if authentication is lost in the meantime.   The authentication means and the control means are supplied with power by a battery provided in the motorcycle, and an external connection type power supply means capable of supplying power to the authentication means and the control means can be connected instead of the battery. The passive entry system according to claim 1.

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