JPH0451627B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an auto-unlock device for automobiles.

[Conventional technology]

As an auto-unlock device for automobiles that unlocks multiple doors at the same time when the driver's side door is unlocked by key operation, for example, a key cylinder lock in which a magnet is fixed to a magnetic holder provided in the key cylinder body, Equipped with a magnetic sensing switch that senses the magnet, the magnetic sensing switch senses the magnet by operating a predetermined unlock key.
A device is known that is configured to output an unlock signal to a door actuator when turned ON, thereby unlocking a plurality of doors at the same time.

According to the above device, the magnetic sensing switch is installed inside the door on the vehicle body side so that it is not affected by magnetic fields other than the magnet fixed to the key chain body. If it was brought close, there was a risk that the magnetic sensor would malfunction and unlock the door.

As a means to prevent such unauthorized unlocking, for example, it is possible to surround the magnetic sensing switch with a magnetic shielding plate to block external magnetism, but this is not reliable and also causes problems such as taking up space. .

[Problem that the invention seeks to solve]

The present invention has been made in view of the above circumstances, and its object is to provide an auto-unlock device for automobiles that can reliably prevent unauthorized unlocking.

[Means for solving problems]

In order to achieve the above object, the present invention includes a key cylinder lock equipped with a magnet and a magnetic sensing switch that senses the magnet, and when a predetermined unlock key is operated, the magnetic sensing switch senses the magnet and turns it on. The automatic unlocking device for an automobile outputs an unlocking signal to a door actuator when the door is unlocked, and the magnetic sensing switch is configured to sense external magnetism outside the vehicle body and not to sense the magnetism of the magnet. It is characterized by being equipped with an external magnetic sensing switch and a control section that stops outputting the unlock signal when the external magnetic sensing switch senses external magnetism outside the vehicle body.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of an auto-unlock device for an automobile according to the present invention. In the figure, 1 is the key cylinder body, 2 is the switch housing, 3 is the control unit,
4 is a door actuator.

A magnet holder (not shown) is provided at the end of the key cylinder body 1, and a magnet 5 is mounted within the magnet holder. This magnet 5 can be unlocked by operating the specified unlock key.
Move from LOCK position to UNLOCK position.

The switch housing 2 is divided into two rooms by a magnetic shielding plate 6. A magnetic sensing switch (reed switch) 7 is installed in the room on the magnet 5 side, and an external magnetic sensing switch (reed switch) is installed in the room on the door outer panel 8 side. A reed switch) 9 is attached.

The magnetic sensing switch 6 detects that the magnet 5 is
It turns ON when you move to the UNLOCK position and approach it. The magnetic shielding plate 6 prevents the magnetism of the magnet 5 from acting on the external magnetic sensing switch 9.
The external magnetic sensing switch 9 is turned on when magnetism is applied from outside the vehicle body. This external magnetic sensing switch 9 is located closer to the door outer panel 8 than the magnetic sensing switch 7, and is not shielded from the magnetic field outside the vehicle body by the magnetic shielding plate 6.
Regarding magnetism outside the vehicle body, it operates more sensitively than the magnetic sensing switch 7. That is, when the magnetic sensing switch 7 senses magnetism outside the vehicle body, the external magnetic sensing switch 9 always senses the magnetic field.

The control unit 3 outputs an unlock signal to the door actuator 4 when the magnetic sensor switch 7 is turned on,
When the external magnetic sensing switch 8 is turned ON, the output of the unlock signal is stopped. FIGS. 2 and 3 show this control section 3 in detail. In the control unit 3 shown in FIG. 2, a magnetic sensing switch 7 and an external magnetic sensing switch 9 are connected to the base side of the transistor Q, and when only the magnetic sensing switch 7 is turned on, the transistor Q becomes conductive. LOW output (unlock signal) is obtained. When the external magnetic sensing switch 9 is turned on, the transistor Q becomes non-conductive and no LOW output is obtained. The control unit 3 shown in FIG. 3 uses an inverter IC1 and a 2-input NAND circuit IC2, an external magnetic sensing switch 9 is connected to the input end of the inverter IC1, and an output end of the inverter IC1 is connected to the 2-input NAND circuit IC2.
The magnetic sensing switch 7 is connected to the a input terminal of the
Connected to the b input terminal of the input NAND circuit IC2,
The output terminal of input NAND circuit IC2 is transistor Q
Connected to the base of 2. In this case as well, when only the magnetic sensing switch 7 is turned on (both the a input terminal and the b input terminal become LOW level and the 2
(The output terminal of the input NAND circuit IC2 becomes HIGH level), and the transistor Q2 becomes conductive. When external magnetic sensing switch 9 is turned on, transistor Q
2 becomes a non-conducting state.

The actuator 4 operates in response to an unlocking signal from the control unit 3 and unlocks a plurality of doors at the same time.

Next, the operation of the above embodiment will be explained.

Magnet 5 is unlocked by operating the specified unlock key.
When moved to the UNLOCK position, the magnet 5
The magnetic sensor switch 7 is turned on by the magnetic force of
An unlock signal is output from the control unit 3 to the door actuator 4. This causes the door actuator 4 to operate and simultaneously unlock a plurality of doors. At this time, since the magnetism of the magnet 5 is shielded by the magnetic shielding plate 6, it does not act on the external magnetic sensing switch 9.

When a strong magnet is approached from the outside of the door outer panel 8 in order to illegally unlock the door, the external magnetic sensing switch 9, which operates more sensitively than the magnetic sensing switch 7 to the magnetism outside the vehicle body, turns on first and controls the door. The unlocking signal output operation of section 3 is stopped.
Therefore, even if the magnetic sensing switch 7 is turned on by a strong magnet outside the vehicle body, there is no risk of the vehicle being unlocked.

When the strong magnet outside the vehicle body is removed, the external magnetic sensing switch 9 is turned off and the control section 3 returns to a state in which it can output an unlock signal.

[Effects of the Invention] As explained above, according to the present invention, an external magnetic switch configured to sense external magnetism outside the vehicle body sensed by a magnetic sensing switch but not to sense the magnetism of a magnet installed in a key cylinder lock. It is equipped with a sensing switch and a control section that stops outputting the unlock signal when the external magnetic sensing switch senses external magnetism outside the vehicle body, so if a strong magnet approaches from outside the vehicle body, the unlock signal will not be output. Since the output is stopped, unauthorized unlocking can be reliably prevented.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a block diagram, and FIGS. 2 and 3 are circuit diagrams showing the control section in detail. 1...Key cylinder lock (key cylinder body), 3
...control unit, 4...actuator, 5...magnet, 6...magnetic shielding plate, 7...magnetic sensing switch, 9
...External magnetic sensing switch.

Claims (1)

[Claims] 1 Key cylinder lock equipped with magnet,
An auto unlocker for automobiles, which has a magnetic sensing switch that senses the magnet, and outputs an unlocking signal to a door actuator when the magnetic sensing switch senses the magnet and turns on by operating a predetermined unlocking key. The device includes: an external magnetic sensing switch configured to sense external magnetism outside the vehicle body sensed by the magnetic sensing switch but not to sense magnetism of the magnet; and an external magnetic sensing switch configured to sense external magnetism outside the vehicle body. An auto-unlock device for an automobile, characterized in that it is equipped with a control section that stops outputting the unlock signal when the unlock signal is unlocked.