JP4852343B2 - Key operation system - Google Patents

Description

  The present invention relates to a key operation system including a key plate as an emergency ignition key.

  2. Description of the Related Art Conventionally, an immobilizer system has been proposed in order to enhance security against theft of a car in a keyless entry system that can unlock a car door and start an engine only by having a portable key device.

  In the immobilizer system, an authentication signal is transmitted and received between the portable key device and the vehicle side, and the engine is started when the authentication signal of the portable key device is authenticated as a normal signal.

  A key operation system, which is a portable key device used in the immobilizer system, includes a main body including a bidirectional communication unit that transmits and receives an authentication signal to and from the vehicle, and an emergency ignition key. The main body includes a battery as a power source for the bidirectional communication unit, and the bidirectional communication unit and the battery are accommodated in a housing.

  The emergency ignition key is a mechanical key that is inserted into a key cylinder installed on the vehicle side when the electric charge stored in the battery runs out, and includes a key plate and a tonlasponder that is assembled integrally with the key plate. It is composed of

When the key plate is inserted into the key cylinder on the vehicle side, electric charges are stored in the capacitor in the transponder by electromagnetic induction, and an authentication signal set in advance in the IC in the transponder is transmitted to the vehicle side. As a result, even when an emergency ignition key is used, the security is not reduced (see, for example, Patent Document 1).
JP-A-11-81510

  However, the key operation system disclosed in Patent Document 1 requires a transponder that is assembled integrally with the key plate of the emergency ignition key device, in addition to the bidirectional communication unit housed in the main body. Furthermore, the cost of an emergency ignition key that requires the transponder to be integrated with the key plate with a resin mold is increased.

  Accordingly, an object of the present invention is to provide a key operation system that can reduce costs.

The key operation system of the present invention includes a housing, a battery housed in the housing, a first antenna, a second antenna, a communication device, and an ignition key plate. The communication device is driven using the battery as a power source, transmits to the vehicle side via the first antenna, receives from the vehicle side via the second antenna, and is housed in the housing. And a first communication unit that is driven to transmit and receive electric power obtained by electromagnetic induction to the vehicle side via the second antenna, and is stored in the housing. And a switch unit that switches between an electrical connection between the first communication unit and the second antenna and an electrical connection between the second communication unit and the second antenna. Is one part. The ignition key plate has an insertion portion that can be inserted into a key cylinder installed in a vehicle, and is a separate component from the communication device. The ignition key plate can be supported on the housing in a first posture in which the inserted portion is accommodated in the housing, and the inserted portion is attached to the housing in a second posture in which the inserted portion protrudes outside the housing. It can be supported. The electromagnetic induction occurs when the ignition key plate is inserted into the key cylinder and rotated while being supported by the housing in the second posture. The switch unit is configured to be switched to a state in which the second communication unit and the second antenna are connected by the electromagnetic induction.

  According to the present invention, the cost of the key operation system can be reduced.

  A key operation system according to an embodiment of the present invention will be described with reference to FIGS. The key operation system 10 is employed in an automobile 20 (shown in FIG. 5).

  FIG. 1 is a perspective view showing a key operation system 10. FIG. 2 is a block diagram schematically showing the inside of the key operation system 10. As shown in FIGS. 1 and 2, the key operation system 10 includes a housing 30, a microcomputer 40, a key side receiving antenna 50, a key side transmitting antenna 60, a battery 70, and an ignition key plate 80. Yes.

  The microcomputer 40 is an example of a communication device according to the present invention, and includes a bidirectional communication unit 41, a reception code control 42, and an emergency communication unit 43, and is accommodated in the housing 30.

  The bidirectional communication unit 41 is a first communication unit referred to in the present invention. The bidirectional communication unit 41 is electrically connected to the key side transmission antenna 60. The bidirectional communication unit 41 is electrically connected to the key-side reception antenna 50 via a reception code control 42 described later. The bidirectional communication unit 41 transmits a key-side authentication signal used for authentication with the automobile 20 side using the key-side receiving antenna 50 and the key-side transmitting antenna 60 to the automobile 20 side, and The vehicle side authentication signal is received from.

  The battery 70 is a power source of the bidirectional communication unit 41 and is electrically connected to the bidirectional communication unit 41. The key side reception antenna 50, the key side transmission antenna 60, and the battery 70 are accommodated in the housing 30.

  The reception code control 42 is electrically connected to the key-side reception antenna 50, the bidirectional communication unit 41, and the emergency communication unit 43. In the reception code control 42, a switch unit 44 and a control unit (not shown) are accommodated. The switch unit 44 includes a first connection state S1 (shown in FIG. 2) in which the key-side receiving antenna 50 and the bidirectional communication unit 41 are connected according to an instruction from the control unit, and the key-side receiving antenna 50 and the emergency communication unit 43. Is switched to the second connection state S2 (shown in FIG. 4).

  The emergency communication unit 43 is the second communication unit referred to in the present invention. The emergency communication unit 43 includes an antenna coil, a transformer, a capacitor, and an IC (not shown). In the emergency communication unit 43, current generated in the antenna coil by receiving magnetism from the outside is stored in the capacitor via the transformer. When the voltage stored in the capacitor reaches a predetermined value, preset information is transmitted to the IC.

  The ignition key plate 80 is made of, for example, metal, and has an inserted portion 81 that is inserted into the key cylinder 23 installed on the automobile side, and a knob portion 82 that is formed integrally with the inserted portion 81. is doing.

  The ignition key plate 80 is detachably supported by the housing 30. This point will be specifically described. The ignition key plate 80 is supported by the housing 30 in the first posture P1 and the second posture P2.

  The housing 30 is provided with an accommodation hole 31 and an engaging portion 32. The accommodation hole 31 is open to the outside. The accommodation hole 31 can accommodate a part of the knob portion 82 of the ignition key plate 80 and allows the insertion portion 81 to pass through the housing 30.

  FIG. 2 shows a state in which the ignition key plate 80 is in the first posture P1. As shown in FIG. 2, the first posture P <b> 1 is a posture in which the inserted portion 81 of the ignition key plate 80 is accommodated in the housing 30.

  The ignition key plate 80 is formed with an engagement recess 83 into which the engagement portion 32 is substantially fitted when the ignition key plate 80 is in the first posture P1. The engaging portions 32 are engaged with each other by fitting into the engaging recesses 83.

  The engagement portion 32 is movable to a position where the engagement with the engagement recess 83 is released (a position where the engagement portion 32 exits from the engagement recess 83), as indicated by a two-dot chain line in the figure. The engaging portion 32 is biased in a direction to engage with the engaging recess 83 by a biasing mechanism (not shown). As shown in FIG. 1, a knob 33 used when moving the engaging portion 32 is exposed outside the housing 30. When the knob 33 is moved, the engaging portion 32 is also moved. When releasing the engagement between the engagement portion 32 and the engagement recess 83, the knob 33 is moved to a position where the engagement portion 32 comes out of the engagement recess 83.

  Note that a through hole 84 that penetrates the knob portion 82 is formed in the knob portion 82 of the ignition key plate 80. In a state where the ignition key plate 80 is in the first posture P <b> 1, the through hole 84 protrudes to the outside of the housing 30.

  FIG. 3 is a perspective view showing the key operation system 10 in a state where the ignition key plate 80 is in the second posture P2. As shown in FIG. 3, the second posture P <b> 2 is a posture in which the inserted portion 81 comes out of the housing 30.

  FIG. 4 is a block diagram schematically showing the inside of the key operation system 10 in a state where the ignition key plate 80 is in the second posture P2. As shown in FIG. 4, the housing 30 has a longitudinal position that positions the ignition key plate 80 in the second posture P <b> 2 by contacting the knob portion 82 of the ignition key plate 80 at a position advanced inward from the accommodation hole 31. A wall 34 is formed. In a state where the ignition key plate 80 is in the second posture P <b> 2, the through hole 84 of the knob portion 82 is accommodated in the housing 30.

  In this way, since the ignition key plate 80 is supported by the housing 30 in the second posture P2, the relative position of the emergency communication unit 43 with respect to the ignition key plate 80 in the second posture P2 is substantially fixed. The

  FIG. 5 shows a front portion of a passenger compartment 21 of the automobile 20 that uses the key operation system 10 as a key. As shown in FIG. 5, an instrument panel 27, a steering device 22, an ignition key plate key cylinder 23, a transmitter 24, and a receiver 25 are installed in the front portion of the passenger compartment 21. Yes. The key cylinder 23 is disposed in the vicinity of the steering device 22.

  A key ring antenna 26 is provided around the key cylinder 23. The key ring antenna 26 is configured by winding a wire around the key cylinder 23. The transmitter 24 and the receiver 25 are disposed in the vicinity of the key cylinder 23. The transmitter 24 and the receiver 25 are arranged side by side in the vehicle width direction, for example.

  Next, the operation of the key operation system 10 when starting the engine (not shown) of the automobile 20 will be described. In a normal state where the battery 70 is sufficiently charged, the engine is started when an occupant turns an ignition knob (not shown) while carrying the key operation system 10. Since the engine can be started without using the ignition key plate 80 in the normal state, the ignition key plate 80 is supported by the housing 30 in the first posture P1.

  Specifically, when the occupant turns the ignition knob, a vehicle-side authentication signal is transmitted from the transmitter 24. When the key-side receiving antenna 50 receives the vehicle-side authentication signal, the control unit of the reception code control 42 changes the connection state of the switch unit 44 to the first connection state S1.

  When the connection state of the switch unit 44 becomes S1, the vehicle-side authentication signal received by the key-side receiving antenna 50 is transmitted to the bidirectional communication unit 41. The bidirectional communication unit 41 confirms the vehicle-side authentication signal and transmits a key-side authentication signal via the key-side transmission antenna 60 when the vehicle-side authentication signal is confirmed to be a normal signal.

  The receiver 25 receives the key side authentication signal and confirms the key side authentication signal. When it is confirmed that the key side authentication signal is a normal signal, the engine is started.

  Since the bidirectional communication unit 41 is not driven when there is no electric charge in the battery 70, the engine is not started only by carrying the key operation system 10.

  Therefore, the occupant uses the ignition key plate 80 to start the engine. Specifically, as shown in FIG. 6, by moving the knob 33, the engaging portion 32 is moved out of the engaging recess 83 to release the engagement between the engaging portion 32 and the engaging recess 83. The ignition key plate 80 accommodated in the housing 30 is pulled out from the housing 30 with the posture P1 of one. Next, the ignition key plate 80 is inserted into the accommodation hole 31 from the knob portion 82, and the ignition key plate 80 is set to the second posture P2.

  Next, the inserted portion 81 of the ignition key plate 80 supported by the housing 30 in the second posture P <b> 2 is inserted into the key cylinder 23. FIG. 7 is a cross-sectional view schematically showing a state in which the inserted portion 81 of the ignition key plate 80 is inserted into the key cylinder 23. In FIG. 7, the transmitter 24 is not illustrated because it is disposed on the back side of the page with respect to the receiver 25. As shown in FIG. 7, the passenger can easily turn the ignition key plate 80 by gripping the housing 30.

  Furthermore, since the ignition key plate 80 is supported by the housing 30 in the second posture P2, the relative positions of the key-side receiving antenna 50 and the emergency communication unit 43 with respect to the transmitter 24 and the receiver 25 are substantially fixed. . The position of the emergency communication unit 43 in the housing 30 is considered so that the signal transmitted by the emergency communication unit 43 can reach the receiver 25 when the ignition key plate 80 is inserted into the key cylinder 23. Are arranged.

  Next, when the occupant turns the ignition key plate 80 (housing 30), a current flows through the key ring antenna 26. Accordingly, a magnetic field is generated. In the reception code control, when the key-side reception antenna 50 receives this magnetism, the switch unit 44 is set to the second connection state S2. Therefore, the key side reception signal 50 is connected to the emergency communication unit 43.

  As described above, the emergency communication unit 43 contains a coil, and the current generated by the magnetism is stored in the capacitor, and the key-side authentication signal is sent from the IC to the key-side receiving antenna 50 using this charge. Is sent through.

  The receiver 25 receives the key side authentication signal transmitted from the emergency communication unit 43. If the vehicle-side authentication signal is a normal signal, the engine is started.

  In the key operation system 10 configured as described above, the emergency communication unit 43 used in a state where the electric charge in the battery 70 is exhausted is incorporated in the microcomputer 40 and is a separate component from the ignition key plate 80. It is.

  As the position of the ignition key plate 80 with respect to the housing 30 is substantially fixed in the second position P2, when the ignition key plate 80 is inserted into the key cylinder 23, the position of the receiver 25 with respect to the emergency communication unit 43 is changed. It is almost fixed.

  Although the output of the emergency communication unit 43 is weak, since the relative position of the emergency communication unit 43 with respect to the receiver 25 is substantially fixed, the receiver 25 can efficiently receive the signal generated by the emergency communication unit 43. Communication reliability is improved.

  As a result, it is not necessary to separately install a communication unit such as a transponder in the ignition key plate 80, and the microcomputer 40 can be used. Therefore, the cost of the key operation system 10 is reduced.

  Further, by incorporating the bidirectional communication unit 41 and the emergency communication unit 43 in the microcomputer 40, these two communication units can be handled as one component. Therefore, the key operation system 10 can be created relatively easily.

The perspective view which shows the key operation system which concerns on one Embodiment of this invention. The block diagram which shows typically the inside of the key operation system shown by FIG. The perspective view which shows the key operation system in the state which has the ignition key plate shown by FIG. 1 in a 2nd attitude | position. The block diagram which shows schematically the inside of the key operation system in the state which has the ignition key plate shown by FIG. 1 in a 2nd attitude | position. The perspective view which shows the front part of the compartment of a motor vehicle provided with the key operation system shown by FIG. The perspective view which shows a mode that the ignition key plate shown by FIG. 1 is pulled out from a housing. Sectional drawing which shows schematically the state by which the to-be-inserted part of the ignition key plate shown by FIG. 4 was inserted in the key cylinder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Key operation system, 30 ... Housing, 40 ... Microcomputer (communication apparatus), 41 ... Two-way communication part (1st communication part), 43 ... Emergency communication part (2nd communication part), 50 ... Key Side receiving antenna (second antenna), 60... Key side transmitting antenna (first antenna), 70... Battery, 80 .. ignition key plate, 81.

Claims (1)

A housing;
A battery housed in the housing;
A first antenna;
A second antenna;
The battery is driven as a power source, transmitted to the vehicle side via the first antenna, received from the vehicle side via the second antenna, and accommodated in the housing. A communication unit, and a second communication unit that drives electric power obtained by electromagnetic induction as a power source to transmit / receive to / from the vehicle side via the second antenna, and is housed in the housing; The switch includes a switch unit that switches between electrical connection between the first communication unit and the second antenna and electrical connection between the second communication unit and the second antenna. A communication device;
An insertion portion that can be inserted into a key cylinder installed in a vehicle is a separate part from the communication device, and the insertion portion is accommodated in the housing in a first posture in which the insertion portion is accommodated in the housing. An ignition key plate that can be supported and supported by the housing in a second posture in which the inserted portion comes out of the housing;
Equipped with,
The electromagnetic induction occurs when the ignition key plate is inserted into the key cylinder and rotated while being supported by the housing in the second posture,
The key operation system , wherein the switch unit is configured to be switched to a state in which the second communication unit and the second antenna are connected by the electromagnetic induction .

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