KR20000010173U - Car burglar alarm - Google Patents

Abstract

The present invention relates to a car theft alarm for the alarm of the stolen vehicle, in particular, it is to be able to easily identify that the stolen vehicle even when the car is driving. To do this, a password check device and a display means are used to compare the input password with a pre-stored correct password. In this way, a pedestrian or other vehicle driver passing by the stolen vehicle can easily find the stolen vehicle so that the stolen vehicle can be found quickly. Therefore, it is also effective in preventing vehicle crime.

Description

Car burglar alarm

The present invention relates to a vehicle theft prevention technology for alarming theft of the car, and more particularly to a car theft alarm to alert that the stolen vehicle even when the vehicle is driving.

Recently, as crimes of theft increase, corporations, families, and national organizations that install theft alarms to prevent theft of property or confidential documents are increasing. Theft of automobiles is also increasing, and thus an automobile antitheft device has been developed to prevent theft of automobiles.

Conventional vehicle anti-theft device warns the vehicle when the shock or other actions to operate the horn. When the anti-theft device is activated, there is a shock sensor that detects shock in the car, and responds to a small shock to alert.

However, the antitheft device will only alarm briefly when there is an impact, and the alarm will stop after a certain time. That is, the conventional anti-theft device does not continuously provide theft alarm. Therefore, if you do not hear the alarm for some reason while the alarm is sounding, or if you do not act quickly when the alarm is heard, the vehicle may be stolen. In addition, there is a problem that it is difficult to find a stolen vehicle even if the vehicle is reported stolen. To find a stolen vehicle, it is necessary to check the car number one by one, so it may not only take a long time to find a stolen vehicle but also may not find a permanent vehicle.

Therefore, the purpose of the present invention is to provide a car theft alarm that can find the stolen vehicle by telling that the stolen vehicle.

1 is a circuit diagram of a car burglar alarm according to an embodiment of the present invention.

2 is an operation of the car burglar alarm according to the embodiment.

* Description of the symbols for the main parts of the drawings *

2: engine switch 3: horn

4 lamp 5 magnetic switch

5c: Magnetic switch coil 6: Password input device

7 electronic circuit 12 display switch

13: indicator 15: disconnect switch

In order to achieve the above object, an automobile burglar alarm according to the present invention includes an electronic circuit unit for querying a password, opening and closing means for operating the electronic circuit unit together with an engine startup, and outputting a password mismatch signal from the electronic circuit unit. First display means for informing that the vehicle, a voltage current sensing means for detecting a change in voltage or current input to the first display means, and outputting a signal if it is determined that the first display means operates abnormally; and the voltage current When the sensing means outputs a signal, it is characterized by having a second display means for continuously indicating that the stolen vehicle after the first display means.

Hereinafter, the present invention will be described in detail with reference to the embodiment of FIG. 1.

The embodiment of Figure 1 is provided with a password input device is configured so that people passing by nearby to easily identify the stolen vehicle by outputting to the indicator that the stolen vehicle is wrong.

Referring to the configuration of Fig. 1, there is a battery (Battery) 1 of a vehicle, a key 14 of a vehicle, and an engine switch 2 having a rotary switch structure for inserting and operating the key 14 is shown. have. The engine switch 2 is composed of one fixed contact 2s and three movable contacts 2a, 2b and 2c. Among these, the movable contact first contact 2a of the engine switch 2 is used for starting an engine or the like. It is a contact which is used for the purpose irrespective of the operation of this embodiment.

Next, there is a magnetic switch 5 that operates according to the operation of the engine switch 2, and a lamp 4 that lights when power is applied to the coil 5c of the magnetic switch 5. . A fixed contact 2s of the engine switch 2 is connected to the negative terminal of the battery 1, and a movable contact 2b of the engine switch 2 is connected to one side of the lamp 4. This is connected. The other side of the lamp 4 is connected to one side of the coil (5c) of the magnetic switch (5).

In general, a magnetic switch is divided into a coil part which is excited when electricity is applied and a contact part which is opened and closed by an electromagnetic force generated when the coil part is excited. This contact portion mainly consists of an auxiliary contact composed of a plurality of a and b contacts used for opening and closing of small power, and a main contact used for opening and closing of a large power. In other words, the contact point which is turned off when the coil part is turned off and turned on when it is excited is referred to as the contact point a. Is called b contact. The magnetic switch 5 used in this embodiment consists of a coil 5c, one a contact 5a, one b contact 5b, and a main contact 5m.

The other side of the coil 5c is connected to one side of the cutoff switch 15, and the other side of the cutoff switch 15 is connected to a positive terminal of the battery 1. Therefore, a circuit consisting of the positive terminal of the engine switch 2, the lamp 4, the magnetic coil 5c, the cutoff switch 15, and the battery 1 is formed starting from the negative terminal of the battery 1.

In addition, a contact 5a of the magnetic switch 5 is connected between the fixed contact 2s of the engine switch 2 and the second contact 2b. This a contact point 5a is a magnetic holding contact point and is an essential contact point for the magnetic switch coil 5c to continue to be excited. When the engine switch 2 is located at the second contact point 2b and the electricity of the battery 1 is applied to the magnetic switch coil 5c, the coil 5c is excited. However, when the engine switch 2 is turned off from the second contact 2b, electricity of the battery 1 may not be supplied to the coil 5c. Since the engine switch 2 cannot be continuously connected to only the second contact 2b, the coil 5c must be kept in an excited state even if it is turned off from the second contact 2b. To this end, a contact 5a is connected between the fixed contact 2s and the second contact 2b of the engine switch 2 for self-maintenance as described above.

Next, one side of the horn 3 is connected to the movable contact third contact 2c of the engine switch 2, and the other side of the horn 3 is connected to one side of the b contact 5b of the magnetic switch 5. Connected. The other side of the b contact 5b is connected to the positive terminal of the battery 1. As a result, a circuit composed of the negative terminal of the battery 1, the third contact 2c of the engine switch, the horn 3, the b contact 5b, and the positive terminal of the battery 1 is formed. Therefore, the horn 3 operates when both the engine switch 2 and the contact b 5b are on.

The b contact 5b is a contact whose operation is opposite to the a contact 5a, and is turned off when the magnetic switch coil 5c is excited, and turned on when the coil 5c is demagnetized. Therefore, when no electricity is normally applied to the coil 5c, the contact b 5b is in an on state.

The magnetic switch 5 has a main contact 5m in addition to the a contact 5a and the b contact 5b. Next to the main contact point 5m is a password input device 6, which is used for inputting a password using a radio button of a car. Of course, it may be provided with a separate input device according to the taste of the owner, or may be installed in a place that is not easily visible to others. Since it is a password input device (6), it would be nice if only the owner knew.

The main contact 5m is for opening and closing the power of the battery 1 applied to the password input device 6, and this main contact 5m simultaneously supplies the power of the battery 1 on the plus side and the minus side. It consists of two contacts to open and close. One side of one of the two contacts is connected to the positive terminal of the battery 1, and the other side of the contact is connected to one side of the password input device 6. In addition, one side of the remaining contact of the main contact (5m) is connected to the negative terminal of the battery 1, the other side of the contact is connected to the other side of the password input device (6). The operation of the main contact 5m is turned on when the magnetic switch coil 5c is excited, and turned off when the coil 5c is demagnetized.

Next to the password input device 6, there is an electronic circuit unit 7 for comparing the password inputted through the password input device 6 with a password previously stored by the borrower. The electronic circuit unit 7 includes a register 8 for storing the password when the password is input through the password input device 6, an EEPROM 10 in which the owner has input the password in advance, and the register ( The microcomputer 9 reads the value stored in 8) and the value stored in the EEPROM 10 and compares the two stored values, and the filter 11 detects the amount of current flowing through the vehicle burglar alarm.

A register 8 is connected to the next stage of the password input device 6, and the output of this register 8 is connected to the microcomputer 9. The EEPROM 10 and the filter 11 are also connected to this microcomputer 9. As a result, all data is input to the microcomputer 9, and the microcomputer 9 controls the car burglar alarm which has been subjected to a comparison process.

On the other hand, the EEPROM 10 is a storage device used only by the borrower to input a password, and thus it is also possible to replace it with an EPROM or another storage device without using an expensive EEPROM. In addition, when a high-performance microcomputer is used, a large-capacity memory is also built in the microcomputer, and thus there is no need to separately store a storage device as in the present embodiment. However, when it is necessary to update the password frequently, using the EEPROM 10 as in the present embodiment can update the password more conveniently. Since the EEPROM can be written or erased electrically, it is much more convenient to update the data (secret code) than the EPROM.

Recently, high-performance microcomputers have embedded EEPROM, ROM, RAM, and many input / output terminals. Therefore, although the register 8 and the EEPROM 10 are outside the microcomputer 9 in this embodiment, it is also possible to replace them all with one microcomputer 9.

The filter 11 monitors the amount of current of the battery 1 input to the present car burglar alarm. The above configuration is for the case where the criminal cuts the wiring so that the criminal is not aware that there is a car theft alarm and detects the change in the amount of current flowing in the circuit when the wiring is cut, and takes action accordingly. In this embodiment, when the wiring is cut, the horn 3 is operated. When the amount of current is sharply reduced, the microcomputer 9 operates the previous cutoff switch 15, thereby applying a current to the horn 3. The horn 3 then sounds an alarm.

At the rear of the vehicle, there is an indicator 13 which displays the stolen vehicle as shown in FIG. One side of the indicator 13 is connected to the connection portion of the magnetic switch coil 5c and the lamp 4 in the front. That is, one side of the magnetic switch coil 5c, one side of the lamp 4, and one side of the indicator 13 are simultaneously connected. The other side of the indicator 13 is connected to one side of the display switch 12, which is a switch that operates in accordance with the control signal of the microcomputer (9). The other side of the display switch 12 is connected to the negative terminal of the battery 1. Thus, a circuit composed of the negative terminal of the battery 1, the display switch 12, the indicator 13, the magnetic switch coil 5c, the disconnect switch 15, and the positive terminal of the battery 1 is formed.

The display switch 12 is always in an off state and is turned on in accordance with a control signal of the microcomputer 9 to supply electricity of the battery 1 to the display 13. The cutoff switch 15 is also turned off according to the control signal of the microcomputer 9. The main purpose of the cutoff switch 15 is to cut off electricity of the battery 1 applied to the magnetic switch coil 5c.

The operation of this embodiment will be described below based on the above configuration.

In order to start the engine of the vehicle, the key 14 is inserted into the engine switch 2 and rotated to the end in the counterclockwise direction, that is, to the third contact point 2c. By the operation of the key 14, the fixed contact 2s of the engine switch 2 and the second contact 2b are instantaneously connected. Then, the positive terminal of the battery 1, the disconnect switch 15, the magnetic switch coil 5c, the lamp 4, the second contact 2b of the engine switch 2, the fixed contact 2s, the battery 1 The current flows through the circuit consisting of the negative terminal of. The cutoff switch 15 is on when there is no control signal of the microcomputer 9, and is turned off when there is a signal. Therefore, when the stationary contact 2s and the second contact 2b of the engine switch 2 are connected, current flows in the circuit, whereby the lamp 4 is turned on, and the magnetic switch coil 5c is excited. It is possible to confirm that power is applied to the magnetic switch 5 by the lighting of the lamp 4.

When the magnetic switch coil 5c is excited, an electromagnetic force is generated. The a contact 5a of the magnetic switch 5 is turned on, the b contact 5b is turned off, and the main contact 5m is turned on by the electromagnetic force. . When the a contact 5a is turned on, the fixed contact 2s and the second contact 2b of the engine switch 2 are connected, so that the engine switch 2 is connected to the third contact 2c via the second contact 2b. Even if located, current continues to flow through the lamp 4 and the magnetic switch coil 5c through this a contact 5a. Therefore, the contacts 5a, 5b, and 5m also maintain states.

When the engine switch 2 passes through the second contact 2b and the engine switch 2 is located at the third contact 2c and the fixed contact 2s and the third contact 2c are connected, Current may flow in a circuit consisting of a terminal, a b contact 5b of the magnetic switch 5, a horn 3, a third contact 2c, a fixed contact 2s, and a negative terminal of the battery 1. Thus, the horn 3 can operate with this current, but because the b contact 5b is turned off in accordance with the excitation of the magnetic switch coil 5c, no current flows into the horn 3. Thus, the horn 3 does not operate.

On the other hand, when the main contact 5m is turned on, the power of the battery 1 is applied to the password input device (6). Then enter the password using the buttons on the radio. The entered password is once stored in the register 8. The microcomputer 9 then reads the register 8 and brings the password to the internal central processing unit (CPU) to confirm that the password has been entered correctly. In addition, the microcomputer 9 also brings a password, which the owner has previously stored in the EEPROM 10, to the CPU. Next, the CPU compares the input password with the password of the EEPROM 10. As a result of the comparison, if the passwords match, the microcomputer 9 does not output the control signal to the cutoff switch 15 or the display switch 12. That is, since the display switch 12 is always in the off state, the power of the battery 1 is not supplied to the indicator 13, so that the letter 'theft vehicle' is not displayed.

If the password is not input for a predetermined time or the input password does not match the previously stored password, the microcomputer 9 determines the driver as a criminal rather than the owner. Therefore, the microcomputer 9 sends a control signal to the display switch 12, and the display switch 12 receiving the signal is turned on. Then, a current flows through a circuit composed of the positive terminal of the battery 1, the disconnect switch 15, the magnetic switch coil 5c, the indicator 13, the display switch 12, and the negative terminal of the battery 1, and the indicator ( 13) denotes the letter 'stolen vehicle'. Figure 2 shows a picture of such a situation. Referring to FIG. 2, an indicator 13 is attached to the rear of the vehicle, and the indicator is labeled 'theft vehicle'.

However, there may occur a case where a criminal cuts the wiring of the indicator 13 while noticing that the 'theft vehicle' is displayed on the indicator 13. Cutting the wires rapidly reduces the amount of current flowing through the car burglar alarm. On the other hand, there is a filter 11 in the electronic circuit unit 7, which monitors the amount of current flowing in the car burglar alarm. Therefore, when the amount of current decreases, the filter 11 outputs a signal, which is input to the microcomputer 9. The microcomputer 9 then outputs a control signal to the cutoff switch 15. The cutoff switch 15 is always in an on state, but is turned off upon receiving a control signal. When the cutoff switch 15 is turned off, no current flows to the magnetic switch coil 5c anymore, and thus the coil 5c is demagnetized. When the coil 5c is demagnetized, the electromagnetic force is dissipated. Therefore, the a contact 5a of the magnetic switch 5 is turned off, the b contact 5b is turned on, and the main contact 5m is turned off. When the b contact 5b is turned off, the fixed contact 2s of the engine switch 2 and the third contact 2c are connected to each other. Therefore, the positive terminal of the battery 1, the b contact 5b, the horn 3, and the Current flows through the circuit consisting of the three contacts 2c, the fixed contacts 2s, and the negative terminal of the battery 1. When the current flows, the horn 3 operates, and thus the horn 3 generates an alarm sound. That is, since the horn 3 is now operated in place of the indicator 13, the police can easily distinguish the stolen vehicle. In the present embodiment, the horn 3 operates, but other devices may be used to replace the indicator 13.

As described above, the automobile theft alarm system according to the present invention may indicate that the vehicle is stolen by not displaying the stolen vehicle when the password is not matched or the password is not input. Therefore, if you report this report, you can quickly find the stolen vehicle. If a vehicle theft alarm system according to the present invention is installed in the vehicle, the owner can rest assured that the vehicle can be found quickly even if the vehicle is stolen, and the police can arrest the criminal. In addition, it can greatly contribute to the prevention of vehicle crime.

Claims (6)

Inquiry means for querying the password, Control means for operating the inquiry means together with starting of an engine; And a display means for indicating that the vehicle is a stolen vehicle by outputting a password mismatch signal from the inquiry means. The method of claim 1, The inquiry means, Input means for inputting a password, Storage means for storing passwords, And a comparison judging means for comparing whether the input password and the password stored in the storage means match. The method of claim 2, The storage means is an automobile burglar alarm, characterized in that using an electrically erasable pyrom (EEPROM). The method of claim 3, wherein The input means, car theft alarm, characterized in that using the switch of the car audio. The method of claim 4, wherein The storage means and the comparative determination means is an automobile theft alarm, characterized in that the integrated microcomputer. The method according to claim 1, wherein A voltage current sensing means for sensing a change in voltage or current input to the display means and outputting a signal if it is determined that the display means operates abnormally; The vehicle burglar alarm further comprises a display means for informing that when the voltage and current detection means outputs a signal.