JP3413410B2 - Automotive anti-theft alarm lock - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a type of anti-theft alarm lock for an automobile, and more particularly to an anti-theft alarm lock for an automobile provided with a pressure change detection unit.

[0002]

2. Description of the Related Art Usually, a driver installs a mechanical anti-theft lock such as a steering wheel lock, a shift lever lock, a hand lever lock or an electronic alarm device in order to prevent the car from being stolen. The above-mentioned mechanical anti-theft lock is precise and difficult to unlock, or strong and hard to break, but in the case of thief's high technology, in many cases it only takes time to steal and it is completely Could not prevent the theft of. On the other hand, an electronic anti-theft alarm device for an automobile normally detects an abnormal vibration encountered by the automobile or an unlocked door, generates an alarm sound, and takes anti-theft measures such as starting power-off. However, although the anti-theft alarm effect can be sufficiently exerted, the vibration detection device is extremely sensitive, and therefore, a sudden alarm sound (for example, thunder, firecracker, passage of a truck) in the outside world causes a violent alarm sound. As such, such error driving caused noise damage to the residential environment.

[0003]

SUMMARY OF THE INVENTION Therefore, the present invention improves upon the above-mentioned drawbacks of known mechanical or electronic vehicle antitheft locks and provides an automotive antitheft alarm lock having both precision detection and robust lock functions. The challenge is to provide. It is equipped with a set of alarm circuits equipped with a pressure change detection unit in the mechanical anti-theft lock body, and when an unauthorized door opening or entry occurs in the protected vehicle, the detection unit is A change in atmospheric pressure is detected, an alarm circuit is triggered to operate, and the mechanical lock body is fixed to an automobile to prevent theft and achieve a combined antitheft effect.

[0004]

According to a first aspect of the present invention, a lock body is locked to an annular handle of a steering wheel and, at the same time, an alarm circuit provided in a case in the lock body starts driving. In the anti-theft alarm lock, the alarm circuit obtains power from an independent battery set that is not connected to the automobile battery, and its CPU operates according to the signal of the pressure change detection circuit, and the pressure change detection circuit
A filter circuit connected to the power supply input terminal, a power supply voltage stabilization circuit connected to the filter circuit, and a power supply voltage stabilization circuit connected to the power supply voltage conversion circuit to convert an external air pressure change condition into an electronic signal by using a pressure detector, A pressure detection circuit that sends to the low band pass amplifier circuit via a capacitor set, and a low band pass amplifier circuit that amplifies this signal and connects it to a positive signal comparison circuit and a negative signal comparison circuit via a resistor and a capacitor element, and a positive signal. , A negative signal is detected, and a positive signal and a negative signal are amplified and output to the CPU through a circuit composed of a set of corresponding diodes, capacitors, resistors and transistors, and the CPU outputs the negative signal. It is characterized by comprising a plus signal comparison circuit and a minus signal comparison circuit for executing the set sound / light warning step. That, and the automobile anti-theft alarm lock. The invention according to claim 2 is characterized in that a hole penetrating the case of the lock main body is provided to allow air inside and outside the case to communicate with each other, and the detection head of the pressure detector is aligned with the hole. The automobile antitheft alarm lock according to claim 1 is used. According to a third aspect of the present invention, there is provided an antitheft alarm lock for an automobile according to the first aspect, wherein the pressure detector is a condenser microphone.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION An anti-theft alarm lock for an automobile according to the present invention is provided with an alarm circuit in the case of a lock body attached to a steering wheel, and the alarm circuit is
It starts up at the same time as the installation, receives electric power from an independent battery set that is not connected to the automobile battery, the CPU operates according to the signal of the pressure change detection circuit, and the pressure change detection circuit is connected to the power input terminal and a filter circuit. , A power supply voltage stabilization circuit connected to it, a pressure detection circuit connected to the power supply voltage stabilization circuit, a pressure detector to convert the external air pressure change situation into an electronic signal, via a capacitor set It sends to the low band pass amplifier circuit, the low band pass amplifier circuit amplifies the above-mentioned signal, and further sends it to the plus and minus signal comparison circuit through the resistance and the capacitor element, and the plus and minus signal comparison circuit detects plus and minus signals. And a circuit composed of plus and minus signals with a set of corresponding diodes, capacitors, resistors and transistors Feeding the amplified via CPU, the C
The PU executes the preset sound and light warning step by this signal.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in the drawings, the embodiment of the present invention is
A set of a lock body 1 capable of locking the steering wheel and an alarm circuit 2 equipped with a pressure detector work together. Among them, the structure of the lock body 1 is like a well-known steering wheel lock, that is, necessary components for locking such as a lock head and a lock core are provided in the pipe of the long rod 11 of the lock body 1 (not shown in FIG. 9). , The long rod 11
A lock seat 12 is provided at the front end of the lock seat 12, and the circuit element of the alarm circuit 2 is provided in the lock seat 12. A lock portion 13 having a substantially C-shaped cross section is provided on the upper surface of the lock sheet 12, and the lock sheet 12
One latch insertion hole 14 is provided on each of the two sides and is combined with the latch 15. When locked, the locking portion 13 is mounted on the steering wheel annular handle 5, and the two ends of the latch 15 are inserted into the latch insertion holes 14, whereby the lock body 1 is locked to the steering wheel annular handle 5. At the same time, the alarm circuit 2 starts operating.

As shown in FIG. 3, the lock sheet 1
2 is provided with a hole 12A penetrating therethrough, and the pressure detector detection head 21 of the above-mentioned alarm circuit 2 is exactly aligned with the hole 12A to allow the air inside and outside the case of the lock sheet 12 to communicate with each other. The detection head 21 accurately detects changes in atmospheric pressure in the vehicle interior space.

Further, as shown in FIGS. 4 and 5, the alarm circuit 2 includes a set of independent battery sets 22 which are not connected to the battery of the automobile as a power supply source, and the CPU of which is a pressure change detection circuit. When the vehicle is driven by a signal and an abnormal signal of the anti-theft alarm situation is triggered, a huge alarm sound is generated in the alarm circuit 2 to intimidate the thief and achieve the function of the alarm theft prevention. The pressure change detection circuit is a power supply filter circuit 2
3, a power supply voltage stabilizing circuit 24, a pressure detecting circuit 25, a low band pass amplifying circuit 26, a plus signal comparing circuit 27, and a minus signal comparing circuit 28. The operation method will be described below by combining electronic circuit diagrams. The power supply is input from one end of the resistor R4, filtered by the capacitor C4,
OP amplifier (OP AMP) U1 circuit and pressure detector M
It is provided to the power supply voltage stabilizing circuit of the IC. Preferably, a condenser microphone is adopted. When the door or window of the automobile is opened during anti-theft operation, the air pressure in the vehicle interior changes momentarily, and the pressure detector MIC converts the situation of the air pressure change into an electronic signal, and the capacitor C5. ,
It is sent to the low band pass amplifier circuit of the OP amplifier U1 via C6, the signal is amplified, and the plus signal and the minus signal are detected by the OP voltage comparator U2 via the resistor R11 and the capacitor C9, and the plus signal is diode D1, Transistor Q1 via capacitor C10 and resistor R15
To the CPU and the negative signal is sent to the transistor Q2 via the diode D2, the capacitor C11 and the resistor R18 to be amplified and output to the CPU. Finally, the CPU executes the sound / light warning step set by this signal.

[0009]

As can be seen from the above, when the present invention is set in the anti-theft state, a thief enters the vehicle in such a manner as to pry open the door of the vehicle or destroy the window to instantaneously open the vehicle door. When a differential change in the air pressure inside the vehicle occurs due to prying open or breaking the window, the pressure detection circuit 25 triggers the alarm circuit 2 to execute the set sound and light warning operation, threatening the thief and notifying the owner of the vehicle. Notifying and mechanical lock body 1 is attached to the steering wheel to prevent theft, thereby achieving an accurate warning and a combined lock antitheft effect.

[Brief description of drawings]

FIG. 1 is a perspective view of the present invention.

FIG. 2 is a use state diagram of the present invention.

FIG. 3 is a partial cross-sectional view of the present invention.

FIG. 4 is a functional block diagram of an alarm circuit of the present invention.

FIG. 5 is a circuit diagram of an alarm circuit of the present invention.

[Explanation of symbols]

1 lock body 11 Nagakage 12 lock sheet 13 Locking part 14 Latch insertion hole 15 stakes 12A hole 2 alarm circuit 21 Pressure Detector Detection Head 22 battery set 23 Power supply filter circuit 24 Power supply voltage stabilization circuit 25 Pressure detection circuit 26 Low band pass amplifier circuit 27 Plus signal comparison circuit 28 Negative signal comparison circuit 5 steering wheel MIC pressure detector CPU central processing unit

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification Code FI E05B 65/12 E05B 65/12 C G08B 13/16 G08B 13/16 Z

Claims (3)

(57) [Claims] 1. An anti-theft alarm lock for a vehicle, wherein a lock body is locked to an annular handle of a steering wheel, and at the same time, an alarm circuit provided in a case inside the lock body starts operation. Power is obtained from an independent battery set that is not connected to the battery, and the CPU operates by the signal of the pressure change detection circuit, and the pressure change detection circuit is connected to the power input terminal and the filter circuit. A power supply voltage stabilizing circuit for connecting to the power supply voltage stabilizing circuit, a pressure detecting circuit which is connected to the power source voltage stabilizing circuit, converts the external air pressure change state into an electronic signal using a pressure detector, and sends the electronic signal to a low bandpass amplifier circuit via a capacitor set; , A low-voltage amplifier that amplifies this signal and connects it to the plus signal comparison circuit and minus signal comparison circuit via the resistance and capacitor elements. A path amplifier circuit detects a plus signal and a minus signal, and amplifies the plus signal and the minus signal through a circuit composed of a set of corresponding diodes, capacitors, resistors and transistors and outputs them to the CPU. An anti-theft alarm lock for an automobile, comprising: a plus signal comparison circuit and a minus signal comparison circuit, wherein the CPU executes a sound / light warning step set by this signal. 2. The lock body is provided with a hole penetrating the case to allow air inside and outside the case to communicate with each other, and the detection head of the pressure detector is aligned with the hole. The anti-theft alarm lock for automobile according to 1. 3. The anti-theft alarm lock for an automobile according to claim 1, wherein the pressure detector is a condenser microphone.