JPH056629B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a locking device for an automobile that is advantageously used for locking the doors of an automobile.

BACKGROUND ART Alarm devices have conventionally been used, for example, to prevent a person attempting to steal a vehicle from unlocking a locked door of a vehicle.
This alarm system is designed to detect when a would-be thief forcibly unlocks the door without using the authorized key, for example by emitting an alarm, turning on or flashing the headlights or taillights, or when the vehicle is stolen. It has the function of generating an alarm symbol on the receiver carried by the person to notify the person of theft.

Problems that the invention seeks to solve: Such alarm systems cannot prevent would-be thieves from opening the unlocked door and breaking into the car, especially if the car is located in a deserted area or if the car owner is far away. The risk of being robbed is extremely high if you are
Being careless.

SUMMARY OF THE INVENTION An object of the present invention is to provide a locking device for an automobile that makes it difficult to open a door when an opening/closing member such as a door is forcibly opened, thereby reliably preventing theft. It is.

Means for Solving the Problems The present invention provides a locking means capable of unlocking an opening/closing member such as a door that opens and closes an opening, an operating means for locking or unlocking the locking means, and an operating means for locking or unlocking the locking means. a first detection means for detecting that the locking means has been unlocked; a second detection means for detecting that the locking means has been unlocked; responsive to outputs of the first and second detection means;
A locking device for an automobile characterized in that it includes a control means that activates the locking means to a locked state when detecting that the locking means is unlocked before an unlocking operation is performed.

Function According to the present invention, an opening/closing member such as a door that opens and closes an opening is locked by a locking means such as a locking mechanism. This locking means can be unlocked by operating means such as a key cylinder.

The unlocking operation of the operating means is detected by the first detecting means, and the locked state of the locking means is detected by the second detecting means. These first
The detection results of the second detection means are input to the control means, and the control means first detects that an unlocking operation has been performed by the first detection means, and then the second detection means detects that the unlocking operation has been performed.
When the detection means detects that the locking means is in an unlocked state, that is, when unlocking is performed in a normal procedure, the door is allowed to be opened.

On the other hand, when the locking means is unlocked before the unlocking operation is performed on the operating means, that is, when the opening/closing member is forcibly opened by a person who intends to steal, etc., the control means controls the locking means. is activated to keep the unlocked locking means locked again.

Therefore, even if a thief attempts to forcefully open the opening/closing member and enter the vehicle, it will be difficult to open the opening/closing member, and theft can be reliably prevented.

Embodiment FIG. 1 is a block diagram showing the electrical configuration of an automobile locking device 1 according to the present invention. This locking device 1 basically includes a solenoid 2 that unlocks or locks a door 5 (see FIG. 2), and a solenoid 2 that unlocks or locks a door 5 (see FIG. 2).
and a processing circuit 3 that detects that the door 5 is unlocked in a normal procedure using a key that turns the locking mechanism 7 into an unlocked state after the door key is unlocked. , a control circuit that drives the solenoid 2 to return the door 5 to the locked state when the processing circuit 3 detects that the door 5 has been unlocked through a procedure other than the normal procedure using the key 4.

The locking mechanism 7 is provided with a door key unlocking detection switch S1, which is a first detection means. One contact S1a of this door key unlock detection switch S1 is grounded, and the other contact S1b is connected to the line 12 to the processing circuit 3.
connected to. The locking mechanism 7 is driven by the solenoid 2. The solenoid 2 is provided with an unlock detection switch 2 as a second detection means, one contact S2a of which is grounded, and the other contact S2b
is connected to the control circuit 4 via line 11 and to the processing circuit 3 via line l4. Furthermore, the door 5 is provided with a door open detection switch S3 for detecting that the door 5 is opened. One contact S3a of the door open detection switch S3 is grounded, and the other contact S3b is connected to the processing circuit 3 via line l3.

A processing circuit 3 implemented by a microcomputer or the like receives signals from a door key unlock detection switch S1 and an unlock detection switch S2, respectively, and executes a regular procedure using a predetermined key as described later. The function is to detect whether the lock has been unlocked or not. When the processing circuit 3 detects that the door 5 is unlocked according to the normal procedure, it activates the alarm output circuit 10 and the oscillation circuit 11 via lines 18 and 19, respectively.

The alarm output circuit 10 outputs a theft alarm signal to the vehicle by, for example, generating an alarm sound using a horn or siren, lighting or flashing headlights and tail lights, or activating a transmitter mounted on the vehicle. It may be configured to achieve a so-called paging function, in which a message is sent to a receiver carried by the owner to notify that theft has occurred.

The oscillation circuit 11 repeatedly applies a signal of, for example, about 5 Hz to the base of the transistor Tr in a time-sequential manner, thereby performing a switching operation of the transistor Tr. The emitter of the transistor Tr is grounded, and the collector is connected from the line 17 via the connection point 12 to the line 15 and thus to the control circuit 4. Control circuit 4
When receives the signal from the transistor Tr,
It functions to drive the solenoid 2 and lock the door 5. Therefore, if the door 5 is unlocked using a key other than the normal procedure, the control circuit 4 that drives the solenoid 2 immediately locks the door 5, so that the door 5 cannot be opened. This makes it difficult to securely prevent theft.

The control circuit 4 is supplied with a signal from a control operation switch section S4 provided at the driver's seat. The control operation switch section S4 includes a lock operation switch S5 and an unlock operation switch S6, and one contact S5
a, S6a are each grounded, and the other contact S5
b and S6b are connected to the control circuit 4 via lines l5 and l6, respectively. The control circuit 4 receives the signal from the control operation switch section S4, drives the solenoid 2, and functions to lock or unlock the door 5.

A signal from a vehicle speed sensor 6 is also input to the control circuit 4 . The vehicle speed sensor 6 detects the traveling speed of the automobile by detecting, for example, a change in the magnetic force of a permanent magnet piece attached to a wheel as the wheel rotates, using a reed switch attached to the vehicle body. When the speed exceeds 20 km/h, the output is sent to the control circuit 4.

When the control circuit 4 receives the output from the vehicle speed sensor 6, it drives the solenoid 2 to lock the door 5. As a result, even if the vehicle is driven with the door 5 unlocked, the door 5 is automatically locked, improving safety.

As shown in FIG. 2, the locking mechanism 7 is provided on each door 5 of the automobile. The locking mechanism 7 is
It has a key insertion slot 7a, and this key insertion slot 7a
The door can be unlocked by inserting the door key into the door and turning it in the unlocking direction. When the locking mechanism 7 here is to close and lock the door 5 that is open from outside the vehicle, after pressing down the operating protrusion 9, the door 5 is opened while the knob 8 of the door 5 is being pulled toward you. It has a structure called a keyless lock mechanism, which locks the door by closing it. The door 5 can be manually unlocked by pulling up the operating projection 9 from inside the vehicle. The locking mechanism 7 is also driven into the locked state by the solenoid 2 as described above.

The solenoid 2 that drives the locking mechanism 7 is, for example, a single coil type latching relay as shown in the third figure. A permanent magnet piece 14 is fixed to the drive shaft 13 of the solenoid 2 . The permanent magnet piece 14 is magnetized in the axial direction of the drive shaft 13. Permanent magnet piece 1
A pair of magnetic poles 17 facing the magnetic poles 15 and 16 of No. 4,
18 is arranged at a fixed position, and the yoke 19
are magnetically coupled by. Permanent magnet piece 1
A coil 20 is arranged surrounding 4.

An exciting current is applied to the coil 20 in one direction so that the magnetic pole 15,
When the coil 20 is excited so that the magnetic poles 17 have opposite polarities, that is, the magnetic poles 16 and 18 have the same polarity, the magnetic poles 15 and 17 are magnetically attracted to each other. Even after the coil 20 is demagnetized, the magnetic poles 15 and 17 remain magnetically attracted.
As a result, the drive shaft 13 is urged upward in FIG. 3, and the locking mechanism 7 is placed in a locked state.

Next, when an excitation current is passed in a direction opposite to the one direction, the magnetic poles 15 and 17 have the same polarity, and the magnetic poles 16 and 18 have opposite polarity, so that the drive shaft 13 is rotated as shown in FIG. is displaced downward to bring the locking mechanism 7 into the unlocked state.

The operation of the locking device 1 according to the present invention will be explained with reference to FIG. Step n0 to step n1
, close the door 5 by pressing down the operating protrusion 9 provided on the door 5 and pulling the knob 8.
Whether or not the condition for locking the door 5 is met, or the condition for locking the door 5 by inserting the key into the key insertion slot 7a of the locking mechanism 7 and operating the angular displacement in the locking direction after closing the door 5 is established. Determine whether it has been established or not. If the above conditions are satisfied, the operation of the processing circuit 3 is started (system set) in step n2.

In step n3, it is determined whether the system has been released. That is, first, it is determined whether the key has been inserted into the key insertion slot 7a of the locking mechanism 7 and angularly displaced in the unlocking direction. When the door is unlocked with the key, the door key unlock detection switch S1 becomes conductive. Next, when the locking mechanism 7 is unlocked, the solenoid 2 is displaced, and the unlocking detection switch S2 becomes conductive. The processing circuit 3 thus operates the switches S1, S
When it is determined that the door 5 has been unlocked in the order of 2, that is, in the normal procedure using the key, the door 5 is made openable and the process returns to step n1.

On the other hand, in step n3, when the unlocking operation using the key is not performed, that is, when the door key unlocking detection switch S1 is shut off, the process moves to step n4, and the locking mechanism is activated from the switching state of the unlocking detection switch S2. 7 is unlocked or not. If it is unlocked, it is determined that theft has occurred and the process moves to step n5, and if it is not unlocked, the process returns to step n3. In step n5, an alarm such as an alarm sound or a flashing lamp is output.

At step n6, the oscillation circuit 11 is activated by the processing circuit 3, and the lock signal from the transistor Tr is repeatedly outputted to the control circuit 4 in a time-sequential manner. As a result, the solenoid 2 is energized and the unlocked locking mechanism 7 is immediately locked, making it difficult to open the door 5 and preventing a person attempting to steal from entering the vehicle.

Next, the process moves to step n7, where it is determined whether the door 5 is unlocked or not, and if so, the step n7 is executed.
Returning to step n6, the locking signal output is continued; otherwise, the process moves to step n8, where the oscillation circuit 1
1 is disabled and the output of the locking signal is stopped. Thereafter, the process moves to step n9, and the above series of operations is repeated until the system is released, that is, until the door key is used to unlock the door.

In this way, before the door key unlocking detection switch S1 detects the unlocking operation using the key,
When the unlocking detection switch S2 detects that the locking mechanism 7 is unlocked, the processing circuit 3 determines that it is theft, activates the solenoid 2 by the locking signal from the transistor Tr, and unlocks the locking mechanism 7. Since the door 5 which is in the locked state is instantly returned to the locked state, it becomes difficult to open the door 5. Well, even if the door 5 is unlocked again without a key operation immediately after being returned to the locked state, the locking signal is repeatedly given to the control circuit 4, so the solenoid 2 is continuously activated and the door 5 is locked. The state is maintained.

Therefore, even if a person attempting to steal the vehicle forcibly unlocks the door 5 and attempts to enter the vehicle, it becomes difficult to open the door 5, and theft can be prevented. Furthermore, since the alarm output circuit 10 can generate an alarm sound and use a paging function, it is extremely effective in preventing vehicle theft.

As another embodiment of the present invention, an alarm output circuit 10
may be omitted. In addition, the locking device 1 is a so-called keyless entry locking device that can be locked/unlocked using a key and locks/unlocks in response to a signal from a transmitter carried by the driver. In some cases, the door key unlock detection switch S1 may receive a release operation using a key or an unlock signal from the transmitter.

Effects With the invention as described above, when it is detected that the locking means has been unlocked without any unlocking operation being performed on the operating means such as the key cylinder while the door is in the locked state, immediately Since the door is returned to the locked state, it becomes difficult to open the door when faced with a situation where the door is forced open and a would-be thief is trying to enter the vehicle interior, thereby reliably preventing theft. can do.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the electrical configuration of an automobile locking device 1 according to the present invention, FIG. 2 is a perspective view of the vicinity of the door 5, FIG. 3 is a sectional view of the solenoid 2, and FIG.
The figure is a flowchart of one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Locking device, 2... Solenoid, 3... Processing circuit, 4... Control circuit, 5... Door, 7... Locking mechanism, 10... Alarm output circuit, 11... Oscillation circuit, S1... Door key unlock detection switch.

Claims (1)

[Scope of Claims] 1. A locking means capable of unlocking an opening/closing member such as a door that opens and closes an opening, an operating means for locking or unlocking the locking means, and an unlocking operation performed by the operating means. a first detecting means for detecting that the locking means has been released; a second detecting means for detecting that the locking means has been released; responsive to outputs of the first and second detecting means;
1. A locking device for an automobile, comprising: a control means for activating the locking means to a locked state when detecting that the locking means is unlocked before an unlocking operation is performed.