JP4041691B2 - Immobilizer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an immobilizer mounted on a vehicle such as a two-wheeled vehicle, a four-wheeled vehicle, a ship, an ATV, a snowmobile, or the like (hereinafter referred to as “two-wheeled vehicle”).
[0002]
[Prior art]
Conventionally, various immobilizers have been proposed that perform authentication communication with a transponder built in an ignition key, determine whether the ignition key is unique to the vehicle, and prevent the vehicle from being stolen. This immobilizer communicates with the transponder by an antenna provided in the vicinity of a key hole into which an ignition key such as a motorcycle is inserted.
[0003]
[Problems to be solved by the invention]
However, in motorcycles and the like, the periphery of the key hole is covered with a metal body by a handlebar bracket, an ignition switch, or a cylinder lock protection device (device that opens and closes the key hole from the outside with a shutter to protect the cylinder lock). It has been broken. For this reason, when a communication antenna is provided around the key hole, the radio wave is blocked by the metal body, the strength is weakened, and authentication may not be performed correctly.
[0004]
The present invention has been made in view of such circumstances, and it is an object of the present invention to provide an immobilizer that is not easily affected even when an antenna is disposed near a metal body.
[0005]
[Means for Solving the Problems]
Invention of claim 1, wherein a transponder built into the ignition key, provided in the vicinity of the key hole in which the ignition key is inserted, comprising an antenna for communication for authentication between the transponder before Symbol In an immobilizer that determines whether the ignition key is unique to the vehicle by communication and prevents the vehicle from being stolen, the antenna is formed in an annular shape and the upper surface of the annular substrate surrounding the key hole of the cylinder lock And an annular magnetic body is disposed at a position corresponding to the antenna on the lower surface of the substrate .
[0008]
According to a second aspect of the present invention, the antenna and the magnetic body are disposed in a case provided in the vicinity of the key hole of the ignition switch, the resin is filled in the case, and the antenna and the magnetic body are molded. It is characterized by that.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
The immobilizer according to the present embodiment is applied to a cylinder lock protection device that protects the cylinder lock by opening and closing a key hole of a rotor disposed in a cylinder body of a motorcycle or the like from the outside. Specifically, as shown in FIGS. 1 and 2, the shutter 2 that opens and closes the key hole 10 from the outside, the cover 3 that covers the shutter 2, the lock means 4 that locks the shutter 2 in the closed state, and the antenna 7a, LED 7b, and substrate 7 to which the ferrite 7c is fixed, a case 5 having the substrate 7 therein, and a case 6 fixed to a cylinder body 8 such as a motorcycle. In FIG. 1, reference numeral 9 denotes a rotor provided in the cylinder body 8, and reference numeral 10 denotes a key hole 10 formed in the rotor 9.
[0010]
The cover 3 is made of, for example, aluminum die-casting or the like. The cover 3 is fitted from the upper surface of the case 6 to cover the shutter 2 and is formed with an opening 21 that allows the key hole 10 to face from the outside in the assembled state. A magnet key hole 22 through which the magnet key MK can be inserted is formed in the upper right corner of the upper surface of the cover 3 so that the shutter 2 can be manually operated by the magnet key MK.
[0011]
A case 5 as shown in FIG. 3 is disposed on the periphery of the opening 21 of the cover 3. The case 5 is made of a resin molded product such as acrylic or polycarbonate, has a tapered portion 5a inclined toward the key hole 10 while being serrated over the entire circumference, and surrounds the key hole 10. The substrate 7 is formed in an annular shape. And at least the taper part 5a is made into light transmission, and it is comprised so that the said opening part 21 can be illuminated by LED7b mentioned later.
[0012]
The substrate 7 is formed in an annular shape as shown in FIG. 4, and has an annular antenna 7a formed of a coil on its upper surface, and an annular ferrite 7c as a magnetic material at a position corresponding to the antenna 7a on the lower surface. It is what has. In addition, an LED 7b as a light emitting means is provided on the lower surface of the substrate 7 together with the ferrite 7c. A wiring to an immobilizer 23 (see FIG. 5), which will be described later, is formed on the upper surface side of the substrate 7, and a wiring for connecting the LED 7b to a power source is formed on the lower surface side.
[0013]
Further, in the state in which the substrate 7 on which the antenna 7a, the LED 7b and the ferrite 7c are disposed is incorporated in the case 5, the inside of the case 5 is filled with a transparent resin, and the substrate 7 and the disposed member are molded. is doing.
[0014]
As shown in FIG. 5, the antenna 7 a of the immobilizer 23 is for performing wireless communication for authentication with the transponder 24 built in the grip 16 of the ignition key IK. It is connected. The immobilizer 23 is a device for determining whether the ignition key IK is unique to the vehicle on the basis of information transmitted from the transponder 24, and preventing the vehicle from being stolen. A CPU (Central Processing Unit) 28, a power supply unit 29, an EEPROM (Electrically Erasable and Programmable Read Only Memory) 30, a communication interface 27, and a wireless unit 25.
[0015]
The CPU 28 is a central processing unit and controls the operation of the immobilizer 23. The power supply unit 29 generates VDD 31 which is a direct current power source for operating the immobilizer 23 from the battery 32, and this battery 32 is connected to the power supply unit 29 via an ignition switch 33 provided in the cylinder body 8. Has been. The ignition switch 33 is a switch that is turned on when the ignition key IK is inserted into the key hole 10 and rotated to the operating position.
[0016]
The EEPROM 30 is a storage means connected to the CPU 28 and is composed of a non-volatile one. Instead, it may be an EPROM (Erasable and Programmable Read Only Memory), an OTP (One Time Programmable Read Only Memory), or the like. it can.
[0017]
The communication interface 27 serves as an intermediary when the CPU 28 communicates with the engine control unit 26 for controlling engine start and stop of the vehicle, and matches the signal level and signal format between the two. .
[0018]
The radio unit 25 modulates information sent from the CPU 28, and the modulated radio signal is sent from the antenna 7a to the antenna 34 (see FIG. 6) of the transponder 24. The radio unit 25 is configured to receive and demodulate the radio signal transmitted from the transponder 24 by the antenna 7a, and send the demodulated information to the CPU 28. A wireless unit power switch 35 is provided between the wireless unit 25 and the VDD 31, and the power of the wireless unit 25 can be turned on / off by an instruction from the CPU 28.
[0019]
The transponder 24 operates based on a radio signal transmitted from the antenna 7a of the immobilizer 23, and transmits a signal as a response to the radio signal to the immobilizer 23 side. In addition, the transponder 24 receives an antenna 34 for receiving a radio signal sent from the immobilizer 23 side, transmits information generated on the transponder 24 side, a radio unit 35 for modulating / demodulating the radio signal, a transponder 24 mainly includes an authentication key generation IC 36 that performs control of 24, an EEPROM 37 that is a non-volatile storage unit that stores information unique to the ignition key IK, and a capacitor 38 corresponding to a secondary battery.
[0020]
The manual interlocking plate member 12 and the remote interlocking plate member 13 are fitted while sandwiching the shutter 2 from above and below, and are independently rotatable around the rotation shaft 11. The rotating shaft 11 is connected to a motor 14 that is remotely operated by a remote controller 15, and transmits the rotation of the motor to the remote interlocking plate member 13.
[0021]
The opening / closing operation of the shutter 2 can be performed both by manual operation using the magnet key MK and by remote operation of the motor 14 driven by the remote controller 15. That is, in order to rotate the shutter 2 by manual operation, when the magnet key MK is brought into contact with the manual interlocking plate member 12 while being matched with the shape 12c, the magnet 17 becomes the urging force of the coil spring 18 by the magnetic force of the magnet M. It moves down against it and the lock is released. In this state, the manual interlocking plate 12 is rotated by the magnet key MK, and the key hole 10 is opened and closed by interlocking the shutter. On the other hand, in order to rotate the shutter 2 by remote operation, the motor 14 is driven by radio waves from the remote controller 15, and the key hole 10 is opened and closed by the shutter 2 in conjunction with the remote interlocking plate 13.
[0022]
Next, the operation of the immobilizer having the above configuration will be described.
When the driver wants to start the engine using the ignition key IK, the shutter 2 in the closed position is rotated to the open position by manual operation using the magnet key MK or remote operation using the remote controller 15.
[0023]
Next, when the driver inserts the ignition key IK into the key hole 10 and turns it to the operation position (ON position), the ignition switch 33 is turned on, the battery 32 is connected to the power supply unit 29, and VDD 31 is connected to the power supply unit. 29, the immobilizer 23 starts operating. When the immobilizer 23 starts to operate, the CPU 28 generates random number data, and subsequently, transmission data for transmission from the wireless unit 25 to the transponder 24 is generated.
[0024]
Such transmission data is wirelessly transmitted from the wireless unit 25 to the antenna 34 of the transponder 24 via the antenna 7a. At this time, since the radio wave passes through the ferrite 7c, which is a magnetic body, the radio wave intensity is increased without being blocked by the cover or the surrounding metal body, and stable communication is performed.
[0025]
The transmitted data is demodulated by the radio unit 35 of the transponder, and an authentication key is generated. Such an authentication key is obtained by encrypting random number data using an encryption key stored in the EEPROM 37.
[0026]
The generated authentication key is returned to the immobilizer 23 side via the radio unit 35 and the antenna 34 of the transponder 24, and the authentication code generated by the CPU 28 using the encryption key stored in the EEPROM 30 on the immobilizer 23 side. Match is confirmed. Even at the time of such reply, the communication radio wave intensity is increased by the ferrite 7c which is a magnetic material, and stable communication is possible.
[0027]
If the authentication code matches the authentication key, the CPU 28 transmits a signal permitting engine start to the engine control unit 26 via the communication interface 27, and the engine is started. Thereafter, the wireless unit power switch 35 is turned off and the wireless unit 25 is stopped, thereby completing a series of authentication operations.
[0028]
The present embodiment has the following effects.
(A) Since the antenna 7a and the LED 7b are integrally accommodated in the case 5 through the substrate 7, communication and illumination of the keyhole 10 can be effectively made compatible and miniaturization can be maintained. .
(B) Since the wiring of the antenna 7a and the wiring of the LED 7b can be performed on the same substrate, the manufacturing cost can be kept low.
(C) Since the antenna 7a is formed on the upper surface of the substrate 7 and the ferrite 7c is formed on the lower surface, the antenna and the magnetic body can be assembled at the same time, and the productivity is improved.
[0029]
The embodiment is not limited to the above, and may be modified as follows, for example.
(A) Instead of the ferrite 7c, another magnetic material may be used.
(B) The ferrite 7c may be disposed at any position as long as it is from the upper surface of the cover 3 to the lower surface of the substrate 7 (including being disposed on the upper surface of the cover 3).
(C) The LED 7b may be disposed on the upper surface of the substrate 7 and the antenna 7a may be disposed on the lower surface.
(D) The present invention may be applied to an ignition switch in which a cylinder lock protection device is not installed.
[0030]
【The invention's effect】
According to the first aspect of the present invention, since the magnetic body (ferrite) is disposed at a position corresponding to the antenna, the magnetic body effectively assists the radio wave of the antenna, so the antenna is disposed near the metal body. Even if it is done, the communication is not easily affected, and the wireless communication between the immobilizer and the transponder can be performed stably.
[0031]
Further, according to the first aspect of the invention, the antenna, since provided on the upper surface of the annular substrate surrounding the cylinder lock of the key hole, the assembly can be easily performed with respect to the cover of the antenna.
[0032]
Further, according to the first aspect of the invention, wherein since the magnetic body is provided on the lower surface of the substrate, the magnetic body even without sufficient clearance beneath the antenna effectively assist the radio wave antenna Therefore, the apparatus can be thinned.
[0033]
According to the second aspect of the present invention, the antenna and the magnetic body are disposed in a case provided in the vicinity of the key hole of the ignition switch, and the case is filled with a resin so that the antenna and the magnetic body because it is molded, it is possible to prevent disconnection or the like due to a short or vibration caused by rainwater and foreign matter into the case from entering.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an immobilizer according to an embodiment of the present invention (a cross-sectional view taken along line II in FIG. 2).
2 is a top view showing an immobilizer according to an embodiment of the present invention. FIG. 3 is a top view and a bottom view showing a lighting cover in the immobilizer according to the embodiment of the present invention. FIG. 4 is an immobilizer according to an embodiment of the present invention. FIG. 5 is a block diagram showing a configuration of an immobilizer according to an embodiment of the present invention. FIG. 6 is a block diagram showing a configuration of a transponder in the immobilizer according to the embodiment of the present invention. Diagram [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Cylinder lock protective device 3 ... Cover 5 ... Case 6 ... Case 7 ... Substrate 7a ... Antenna 7b ... LED (light emitting means)
7c Ferrite (magnetic material)
DESCRIPTION OF SYMBOLS 8 ... Cylinder body 9 ... Rotor 10 ... Key hole 16 ... Holding part 21 ... Opening part 23 ... Immobilizer 24 ... Transponder 25 ... Radio | wireless part 26 ... Engine control unit 27 ... Communication interface 28 ... CPU
29 ... Power supply 30 ... EEPROM
31 ... VDD
32 ... Battery 33 ... Ignition switch 34 ... Antenna 35 ... Wireless unit 36 ... Authentication key generation IC
37… EEPROM
38 ... Capacitor IK ... Ignition key

Claims (2)

A transponder built in the ignition key and a key hole in which the ignition key is inserted, and an antenna for performing communication for authentication with the transponder. The communication key is specific to the vehicle by the communication. In the immobilizer for discriminating whether the vehicle is a theft, the antenna is formed in an annular shape, and is provided on the upper surface of the annular substrate surrounding the key hole of the cylinder lock, and An immobilizer comprising an annular magnetic body disposed at a position corresponding to the antenna on the lower surface . Claim 1, wherein the antenna and the magnetic body while being disposed in a casing provided in the vicinity of the key hole the ignition switch, the resin was packed in the casing, characterized in that by molding the antenna and the magnetic Immobilizer as described in.

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