JP4616014B2 - Key interlock device - Google Patents

Description

  The present invention relates to a key interlock system that prevents a key from being removed from a vehicle except in a parking state, and more particularly to a key interlock device that prevents occurrence of a malfunction when a power line is disconnected.

  The key interlock device locks the key when the shift lever of the car (AT car) is set to a reverse range (R), neutral range (N), or drive range (D) other than the parking range (P). It is a device that locks the key cylinder with a mechanism so that the key cannot be removed. This allows the driver to forget to set the parking range when parking because the key cylinder cannot be unlocked unless the shift lever is set to the parking position. . Thereby, the vehicle is not parked in a movable state, and the vehicle does not move even on a slope. In addition, since the vehicle is not set outside the parking range when the next key is inserted, it is possible to effectively prevent the vehicle from suddenly starting when the engine is started.

  As shown in FIG. 8, the key interlock device operates by being supplied with a power supply voltage from a power supply 30 via a fuse 31 and a key lock solenoid 40 that mainly drives a key lock mechanism, and the parking switch 20 is turned on and off. The control means 100 is configured to switch the energization direction of the key lock solenoid 40 based on the above.

FIG. 9 is a timing chart showing the operation of this key interlock device. As shown in this figure, the control means 100 generates a lock signal internally when it detects that the parking switch (P-SW) 20 has changed from on to off, and causes the key lock solenoid 40 to generate a current in the lock direction. To make the key lock mechanism locked. Further, when the control means 100 detects that the P-SW 20 has changed from OFF to ON, it generates an unlock signal internally and causes a current in the unlock direction to flow through the key lock solenoid 40 to activate the key lock mechanism. An unlocked state is set (Patent Documents 1 and 2).
JP 7-017336 A (paragraphs 0003 to 0005, FIG. 4) Japanese Patent Laid-Open No. 7-329716 (paragraphs 0002 to 0003, FIG. 1)

However, in the conventional key interlock device described above, eg if the harness disconnection of fuse blowing and off like the battery terminals will be interrupted the power supply to the control means to generate a set of shift lever to the parking range Even so, there is a problem that an unlock signal is not generated inside the control means and the key cannot be removed.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a key interlock device that does not cause a problem that the key cannot be removed even when the power supply to the control means is interrupted. And

A first key interlock device according to the present invention drives a key lock mechanism that disables removal from the key cylinder in a state in which the key is inserted into the key cylinder, thereby bringing the key lock into a locked state or an unlocked state. When the parking switch is turned off, the key lock mechanism is locked, and when the parking switch is turned on, the key lock mechanism is unlocked. And a controller for driving the key lock solenoid so that the key lock mechanism is unlocked when the power supply from the power source is cut off. Monodea is, the outputs of the unlock signal for driving said key lock solenoid such that A capacitor for holding the power supply voltage necessary for driving of the key lock solenoid to the output of at least the unlock signal after the supply voltage is cut off from the power supply when the power supply from the source is interrupted is completed It is characterized by that.

The second key interlock device according to the present invention drives a key lock mechanism that disables removal from the key cylinder in a state where the key is inserted into the key cylinder, thereby bringing the key lock into a locked state or an unlocked state. When the parking switch is turned off, the key lock mechanism is locked, and when the parking switch is turned on, the key lock mechanism is unlocked. In a key interlock device comprising: control means for driving the key lock solenoid so as to be in a locked state; and a key switch for changing the state depending on whether or not a key is inserted into the key cylinder. When the power supply from the power source is cut off, the key switch is “key inserted” If it is state outputs an unlock signal for driving said key lock solenoid as said key lock mechanism is unlocked, the key when the key switch is in a state of "key insertion none" all SANYO controlled to maintain the locking mechanism as it is, the output of at least the unlock signal after the supply voltage is cut off from the power supply when the power supply is cut off from the power supply is completed A capacitor for holding a power supply voltage necessary for driving the key lock solenoid until the operation is completed .

  According to the first key interlock device of the present invention, even when the power supply to the control means is cut off in the key lock state, the control means can lock the key when the power supply from the power supply is cut off. Since the key lock solenoid is driven so that the mechanism is unlocked, it is possible to prevent the occurrence of a problem that the key lock is not released.

  According to the second key interlock device of the present invention, in addition to the above effect, when the key switch that changes the state depending on whether or not the key is inserted into the key cylinder is in the “no key insertion” state. Since the unlock signal is not output even when the power supply from the power source is cut off, it is possible to prevent wasteful driving power consumption for the key lock solenoid.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a circuit diagram showing a configuration of a key interlock device according to a first embodiment of the present invention.

  The key interlock device includes a key lock solenoid 40 that drives a key lock mechanism, and a control means 10 that drives the key lock solenoid 40.

  The control means 10 operates by being supplied with a power supply voltage from the power supply 30 via the fuse 31 and is key-locked based on the on / off state of the parking switch (P-SW) 20 and the supply state of the power supply voltage from the power supply 30. The energizing direction of the solenoid 40 is switched. The control means 10 includes an input interface circuit 11, a control unit 12, a power supply voltage holding circuit 13, a power supply unit 14, and an output interface circuit 15. The input interface circuit 11 inputs an ON / OFF signal of the P-SW 20 and a power supply voltage from the power supply 30, and outputs a signal indicating both states to the control unit 12. The control unit 12 outputs a lock signal or an unlock signal based on the output signal from the input interface circuit 11. The output interface circuit 15 supplies drive currents in different lock directions or unlock directions to the key lock solenoid 40 based on the lock signal or the unlock signal. The power supply voltage holding circuit 13 is constituted by a capacitor C having a predetermined capacity, and is necessary for driving the key lock solenoid 40 at least after the power supply voltage of the power supply 30 is cut off until the output of the unlock signal is completed. Holds the power supply voltage. The power supply unit 14 stabilizes the power supply voltage from the power supply 30 and supplies it to the control unit 12.

  FIG. 2 is a circuit diagram showing an example of the output interface circuit 15.

  When the unlock signal rises, the transistors 151 and 153 are turned on, and a current for unlocking flows through the key lock solenoid 40. When the unlock signal falls, the transistors 151 and 153 are turned off, and the + side of the capacitor 154 is charged. When the lock signal rises, the transistor 152 is turned on, so that the charge charged in the capacitor 154 is discharged through the transistor 152, and a current in the direction opposite to that during unlocking flows through the key lock solenoid 40. In this way, the direction of the current flowing through the key lock solenoid 40 is changed.

  Next, the operation of the key interlock device configured as described above will be described.

  FIG. 3 is a front view of the key cylinder. Keys can be inserted into the key cylinders at the positions indicated by OFF, and the inserted keys are sequentially locked in the clockwise direction in the figure (LOCK), accessory position (ACC), on position (ON), and starter position. (START) can be taken. When the key is positioned downstream of the LOCK position in the clockwise direction, if the P-SW 20 is in the on state (unlocked state), the key can be removed by returning to the OFF position, but the P-SW 20 is in the off state ( In the locked state), a key lock mechanism (not shown) restricts the rotation of the cylinder, so that it cannot return from the LOCK position to the OFF position, and the key cannot be removed. However, when the control unit 12 detects a power interruption, the controller 12 is unlocked and can be rotated from the LOCK position to the OFF position.

  In order to realize the above operation, the control unit 12 executes the operation shown in FIG. 4 at regular intervals. FIG. 4 shows only the part of the control unit 12 added to realize the present invention.

  First, an input signal input from the input interface circuit 11 to the control unit 12 is confirmed (S1). If the input has not changed since the previous confirmation, the process ends and waits. If the input has changed, it is confirmed whether or not it is a change of the P-SW 20 (S3), and if it is a change of the P-SW 20 and it is a change from the on state to the off state (S4) ) A lock signal is output (S6), and if it is a change from an off state to an on state (S4), an unlock signal is output (S9). At the same time as the change of the P-SW 20, the presence or absence of power disconnection is also confirmed (S5, S8). If a disconnection is detected, an unlock signal is output (S7, S10). On the other hand, if the input has changed but it is not a change of P-SW 20 (S3), the presence or absence of power disconnection is confirmed (S11), and if the power is disconnected, an unlock signal is output. (S12) If the power supply is not disconnected, the process returns to standby (S11).

  FIG. 5 shows the above operation in a timing chart of signals of the respective units.

  The lock signal is output with a constant pulse width when the P-SW changes from the on state to the off state, and the unlock signal is output with a constant pulse width when the P-SW changes from the off state to the on state. Is output. When the power source changes from the on state to the off state, the power source voltage holding circuit 13 maintains the power source voltage of the control unit 12 for the time Td. Here, the time Td is longer than the pulse width Tout of the unlock signal. In this way, the power supply voltage holding circuit 13 holds the power supply voltage for a time that can ensure the output of the unlock signal.

  According to this embodiment, even if the key cylinder is locked and the power supply is disconnected, the key cylinder is unlocked due to the output of the unlock signal immediately after that, and the key cannot be removed from the key cylinder. Can be prevented.

  FIG. 6 is a circuit diagram showing a configuration of a key interlock device according to the second embodiment of the present invention.

  In this embodiment, a key switch (KEY-SW) 50 that changes the state depending on whether or not a key is inserted in the key cylinder is newly provided, and the control means 10 'is an input interface circuit 11' and P- The states of SW20 and KEY-SW50 are input and output to the control unit 12 '. When the KEY-SW50 is in a "no key insertion" state, the control unit 12' detects a power disconnection. Even so, the unlock signal is not output, and the power consumption when the key is not inserted is reduced. Note that the input path of the power supply voltage from the power supply 30 is not particularly shown, but it may be supplied as another input to the input interface circuit 11 ′, or may be supplied via the KEY-SW 50. May be input.

  FIG. 7 is a flowchart of the control unit 12 ′. Parts that are the same as those in FIG. 4 are given the same reference numerals, and descriptions of overlapping parts are omitted.

  The flowchart of FIG. 7 differs from the flowchart of FIG. 4 in that it is determined whether or not the P-SW 20 is off after it is determined that there is a disconnection in the power disconnection determination (S11) (S21). That is, it is not possible to distinguish between “no key insertion” and “power disconnection” only by input from the KEY-SW 50. Therefore, in step S11, when the input from the KEY-SW 50 is off, it is determined that the power supply is disconnected for the time being, and if the key interlock device detects the off state of the P-SW 20 in the locked state, the “no key state” Therefore, it is determined that the power supply is disconnected, and an unlock signal is output (S12). On the other hand, if the P-SW 20 is in the on state, the “no key insertion” state or the unlock state has already been entered, and therefore the standby operation is returned without outputting the unlock signal (S21). As a result, it is possible to prevent unnecessary output of the unlock signal and reduce power consumption.

  When the power supply voltage is supplied via the KEY-SW 50, the circuit of the previous embodiment outputs an unlock signal every time the key is pulled out. As in this embodiment, By confirming the state of the P-SW 20 at the time of detecting the power disconnection, it is possible to prevent such useless output of the unlock signal.

It is a circuit diagram which shows the structure of the key interlock apparatus which concerns on the 1st Embodiment of this invention. It is a circuit diagram which shows one structural example of the output interface circuit in the same apparatus. It is a front view of a key cylinder. It is a flowchart which shows operation | movement of the apparatus. It is a timing chart which shows operation | movement of the apparatus. It is a circuit diagram which shows the structure of the key interlock apparatus which concerns on the 2nd Embodiment of this invention. It is a flowchart which shows operation | movement of the apparatus. It is a circuit diagram which shows the structure of the conventional key interlock apparatus. It is a timing chart which shows operation | movement of the apparatus.

Explanation of symbols

  10, 10 ', 100' ... control means, 11, 11 '... input interface circuit, 12, 12' ... control unit, 13 ... power supply voltage holding circuit, 14 ... power supply unit, 15 ... output interface circuit, 20 ... parking switch 30 ... Power supply, 31 ... Fuse, 40 ... Key lock solenoid.

Claims (4)

A key lock solenoid that drives a key lock mechanism that disables removal from the key cylinder in a state where the key is inserted into the key cylinder, and makes the lock state or unlock state;
When the parking switch is turned off, the key lock mechanism is locked, and when the parking switch is turned on, the key lock mechanism is unlocked. In a key interlock device comprising: control means for driving the key lock solenoid so that
Wherein, Ri Monodea for outputting an unlock signal the key lock mechanism drives the key lock solenoid so that the unlocked state when the power supply from the power supply is interrupted,
A capacitor for holding a power supply voltage necessary for driving the key lock solenoid until at least the output of the unlock signal is completed after the power supply voltage from the power supply is cut off when the power supply from the power supply is cut off; key interlock device, characterized in that it comprises. A key lock solenoid that drives a key lock mechanism that disables removal from the key cylinder in a state where the key is inserted into the key cylinder, and makes the lock state or unlock state;
When the parking switch is turned off, the key lock mechanism is locked, and when the parking switch is turned on, the key lock mechanism is unlocked. Control means for driving the key lock solenoid so that
A key interlock device comprising: a key switch that changes a state depending on whether or not a key is inserted into the key cylinder;
The control means controls the key lock solenoid so that the key lock mechanism is unlocked when the key switch is in the “key inserted” state when power supply from the power source is cut off. It outputs an unlock signal for driving, when the key switch is in a state of "key insertion None" all SANYO controlled to maintain the key lock mechanism as it is,
A capacitor for holding a power supply voltage necessary for driving the key lock solenoid until at least the output of the unlock signal is completed after the power supply voltage from the power supply is cut off when the power supply from the power supply is cut off; key interlock device, characterized in that it comprises. The control means includes
When the parking switch is turned from the on state to the off state, a lock signal having a predetermined pulse width is output, and when the parking switch is turned from the off state to the on state and when the power supply voltage from the power source is cut off A control unit for outputting an unlock signal having a predetermined pulse width;
An output interface circuit that supplies a current that causes the key lock mechanism to be locked to the key lock solenoid by the lock signal, and supplies a current that causes the key lock mechanism to be unlocked to the key lock solenoid by the unlock signal. The key interlock device according to claim 1, further comprising: The control means includes
A lock signal having a predetermined pulse width is output when the parking switch changes from an on state to an off state, and when the parking switch changes from an off state to an on state and when the key switch is in a “key inserted” state. A control unit that outputs an unlock signal having a predetermined pulse width when a power supply voltage from the power supply is cut off;
An output interface circuit that supplies a current that causes the key lock mechanism to be locked to the key lock solenoid by the lock signal, and supplies a current that causes the key lock mechanism to be unlocked to the key lock solenoid by the unlock signal. The key interlock device according to claim 2, further comprising:

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