JPH0899600A - Antitheft device for vehicle - Google Patents

Abstract

PURPOSE: To more positively prevent a theft from being committed in an automobile with a door locked/unlocked by an actuator. CONSTITUTION: An antitheft device for a vehicle is provided with a door switch 1 linked with the key cylinder of a door, and an actuator 8 operated by the opening/closing of the door switch 1 so as to move a door latch. A second door switch 3 closed only for the fixed time from the start of operation is further provided separately from the door switch 1, and the door latch comes off only when both door switches 1, 3 are operated. Because of not having only one switch as in a conventional way, the actuator 8 cannot be operated even if wiring is earthed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle antitheft device applied to a vehicle in which a door can be locked and unlocked by an actuator.

[0002]

2. Description of the Related Art Vehicles such as automobiles are provided with a door lock device that keeps the door closed to prevent the door from being opened accidentally. When the door lock device is operated from the outside of the vehicle compartment, a cylinder key (hereinafter referred to as a key) is inserted into a key hole of a cylinder lock provided in the door, and is locked or unlocked by rotating the key at a predetermined angle. There are two types of operations from the passenger compartment, one of which is a structure that pushes a knob that protrudes inside the door glass to lock it and pulls it up to unlock it, and the other one is to rotate to the inner surface of the door. It is a structure that pushes the knob provided so as to lock and pulls it to unlock.

In any case, the structure is basically purely mechanically operated, but in recent vehicles, a solenoid-plunger mechanism (hereinafter referred to as a solenoid mechanism) as an actuator is provided inside a door, and an electric power is supplied by this solenoid mechanism. There are many things that are designed to be operated manually. In such electrically operated systems, multiple solenoid mechanisms are centrally controlled from the driver's seat, and when the speed of the vehicle that has started traveling reaches a certain value, the speed is detected and automatically locked. It is possible to improve the usability.

In such an electrically controlled type, a separate switch associated with the key cylinder is provided in the key cylinder portion of the door, and when the key cylinder is operated,
The signal from the controller is grounded by this switch (grounded to the vehicle body), so that the controller determines that the key cylinder is operated, and the controller operates the door opening / closing actuator provided on the door to lock or lock the door. It is usually structured to unlock.

In the door lock device having the above structure, the switch provided in the door is unlocked by grounding the signal line of the controller. Therefore, when the signal line from the controller to the switch is disconnected and grounded. The door will be opened. This signal line is wired so that it cannot be seen from the outside, but if it is found and grounded from the outside, the door will be opened and stolen.

As a prior art, in a vehicle in which an alarm is issued when the door is opened without inserting a key into the key cylinder, the key cylinder provided in the door is pulled out from the outside of the door to detect the theft. There is a device in which a connector provided in the middle of the wiring is disconnected to prevent the theft detection device from being released when the above is tried to be released (see Japanese Utility Model Publication No. 1-36766). In addition, the locking / unlocking memory means for storing the locked / unlocked state of the door is provided, and the technology for putting the unlocked / unlocked memory means into the unlocked state by pressing the knob unlock switch from inside the vehicle or operating the key from outside It is described in Japanese Patent Publication No. 5-27748.

[0007]

However, in both of these, the number of parts is large and the structure is complicated,
In particular, there is a problem that it is difficult to implement for a small vehicle having a small space volume inside the door. The present invention has been made in view of this point, and an object of the present invention is to provide a device capable of reliably preventing theft with a simple structure.

[0008]

According to the present invention, there is provided a door switch linked to a key cylinder of a door and an actuator which is operated by opening and closing the door switch to move a door latch, and separately from the door switch. A vehicle antitheft device, characterized in that a second door switch that is closed for a certain period of time from the start of operation is provided, and the door latch is disengaged only when both door switches are operated.

[0009]

With this structure, only the person holding the key can operate the door switch and the second door switch, thereby disconnecting the signal line from the controller as in the conventional case. The controller cannot be unlocked even by grounding the controller.
The door can be opened only when both the door switch and the second door switch are activated.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a door switch for the right side door, and 2 is a door switch for the left side door. In the following description,
For convenience, these door switches are referred to as first door switches. 3 is a second door switch for the right door, and 4 is a second door switch for the left door. The first door switches 1 and 2 are key cylinders of a door (not shown) (see FIG. 2)
It is turned on when a key is inserted into the key hole 6 of the key cylinder 5 and rotated by a predetermined angle to unlock. The second door switches 3 and 4 will be described later. One of the four door switches 1 to 4 is grounded (vehicle body ground), and when turned on, the input terminals 7a to 7d of the door lock controller 7 are grounded.

The door lock controller 7 has four input terminals 7a to 7d and two output terminals 7e and 7f. When the input terminals 7a and 7c are grounded, the output terminal 7e is provided.
To output a voltage to the output terminal 7f when the input terminals 7b and 7d are grounded. Output terminal 7
An actuator 8 for the right door is provided between e and the ground circuit.
Is connected, and the actuator 9 for the left door is connected between the output terminal 7f and the ground circuit. When the actuators 8 and 9 are both energized, they generate an electromagnetic force, and the door latch 10 (see FIG. 2) is removed to bring it into an unlocked state.

FIG. 2 is a system diagram showing a mechanical part.
For convenience, the right door will be described, but the left door has the same structure. In this figure, 11 is a rod, which is lowered by inserting a key into the key hole 6 of the key cylinder 5 and rotating it by a predetermined angle. The above-mentioned door latch 10 is coupled to the lower end of the rod 11 so that the door can be locked and unlocked by operating a key. The basic structure up to this point is the same as the conventional one.

The door latch 10 locks and unlocks the door by operating the keys as described above, and the actuator 8 also performs the same operation. Although the actuator 8 is not shown in the drawing because it is assumed that the actuator 8 is incorporated in the door latch 10, the actuator 8 may be separately provided and linked. Door switch 1 is door latch 10
It is connected to the rod 11 via the, and is turned on and off in association with the elevation of the rod 11.

A pin 12 is provided in the middle of the rod 11 so as to project in the horizontal direction. A second door switch 3 is provided near the pin 12 and an arm 13 thereof is attached to the pin 12. It comes in contact. Due to the structure described later, the arm 13 is instantly turned on only when pushed by the pin 12 from above, and turned off when the pin 12 passes. In addition, by operating the key, pin 1
When 2 pushes the arm 13 from below, the off state is continued.

The principle structure of the second switch 3 (similarly to the second switch 4) will be described with reference to FIG. Case 14
A hole 15 is provided in the arm 15.
The tip of 3 is protruding. The arm 13 rotates about the shaft 16 by a predetermined angle, but is kept horizontally by the springs 17 and 18 at all times. A contact point 19 is attached to the upper rear end of the arm 13 and faces a contact point 20 located above it at a predetermined interval. The contact 20 is maintained in a horizontal state by the leaf spring 21, but can escape upward when pushed by the rear end of the arm 13. With this structure, the second door switch is closed only for a certain time from the start of operation. Lead wires 22 and 23 are connected to the contacts 19 and 20, respectively.

Referring to FIGS. 4 to 7, the second switch 3
The operation of will be described. FIG. 4 shows the initial state when the door is locked. At this time, since the rod 11 is pulled upward, the pin 12 is connected to the second switch 3
Are located above and apart from the arm 13. Therefore, the contacts 19 and 20 are not in contact with each other and are off. When the key cylinder is operated with the key to open the door and the rod 11 is lowered, the pin 12 is also lowered and the arm 13 of the second switch 3 is pushed downward. This is the state shown in FIG.

The arm 13 is rotated clockwise by being pushed by the pin 12, and the contact 19 makes contact while pushing the contact 20.
That is, at this time, the second switch 3 is turned on. Since the first door switch 1 not shown in the figure is turned on after that, the door lock controller 7 shown in FIG.
The input terminals 7a and 7c are sequentially grounded, and the door lock controller 7 excites the actuator 8 for the right door to release the door lock. Therefore, from this state, the right door can be opened.

The rod 11 does not stop at this position and further descends. Therefore, as shown in FIG. 6, the pin 12 gets over the arm 13 and releases the arm 13. As a result, both contacts 19 and 20 are in their original state (free state shown in FIG. 4).
Then, the second switch 3 is turned off. When the second switch 3 is turned off, the excitation of the actuator 8 is released, so that the lock state is restored, but the state is continued for a predetermined time after the second switch 3 is turned on. The door can be opened in the meantime if it is configured electrically or mechanically so that As a configuration for that purpose, a time constant circuit may be provided electrically in the door lock controller 7, and a structure may be provided mechanically so that the posture return of the arm 13 is delayed.

When the door is closed and locked, the key is inserted into the key cylinder and rotated in the direction opposite to the unlocking direction. Then, the rod 11 rises and the pin 12 also rises at the same time. As a result, the pin 12 hits the arm 13 from below and rotates it in the counterclockwise direction. This is the state shown in FIG. Since the rotation in this direction is the direction in which the contact 18 separates from the contact 19, the second switch 3 continues to be in the off state.

With the operation described above, the door can be locked and unlocked. Since the door cannot be opened unless both the conventionally provided first door switch 1 and the newly provided second door switch 3 are turned on, the circuit of the first door switch 1 is different from the conventional one. You can't open the door even if you find it from the outside of the car body and cut it to make contact with the ground circuit. In the description of the embodiment, the first door switch 1 and the second door switch are described to be turned on with a time shift, but both door switches 1 and 3 are necessarily to be turned on with a shift. Alternatively, it is possible to turn them on at the same time. The point is that the door lock controller 7 should be able to judge that the door is about to be opened by a key operation.

FIG. 8 is a flow chart for explaining the operation of the above embodiment. When a signal is input to the door lock controller in step S1, it is determined in step S2 whether or not the signal is the signal of both the first door switch 1 and the second door switch 3, and both signals are input. If it is recognized that the door can be opened in step S3, and if it is determined that both signals are not received, the door cannot be opened in step S4. Step S5 is the end of operation.

In the above embodiment, the second switch 3
However, the present invention is not limited to this. Electronically configuring the second switch,
It is also possible to use a device in which when the key is operated, the switch is turned on once to generate an on-pulse for a fixed time. Further, the second switch 3 is configured so that it will not be turned on unless the key cylinder 5 is operated by a key, and the second switch 3 is connected in series with the switch 1 to the actuator 8 so that the door lock controller 7 can be operated. It is also possible to configure the circuit without depending on.

[0023]

Since the present invention is the vehicle antitheft device configured as described above, the wiring can be operated from the outside of the vehicle as in the conventional case by a simple structure in which only the second switch is added. Doors that cannot be unlocked.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention.

FIG. 2 is a system diagram showing a mechanical part of the present invention.

FIG. 3 is a front view showing the structure of an example of a second switch.

FIG. 4 is an explanatory diagram showing an operation of a second switch.

FIG. 5 is an explanatory diagram showing a state of the second switch different from that of FIG. 4;

FIG. 6 is an explanatory diagram showing a state of the second switch different from that in FIG. 5;

FIG. 7 is an explanatory diagram showing a state of the second switch different from that of FIG. 6;

FIG. 8 is a flow chart for explaining the operation.

[Explanation of symbols]

 1 First Door Switch 2 First Door Switch 3 Second Door Switch 4 Second Door Switch 5 Key Cylinder 7 Door Lock Controller 8 Actuator 9 Actuator 10 Door Latch 11 Rod 12 Pin 13 Arm

Claims (1)

[Claims] 1. A door switch associated with a key cylinder of a door and an actuator that operates by opening and closing the door switch to move a door latch are provided, and the door switch is closed for a certain period of time from the start of operation. An anti-theft device for a vehicle, wherein a second door switch is provided, and the door latch is disengaged only when both door switches are activated.