CN2170880Y

CN2170880Y - Computer code theft-proof alarm for vehicle

Info

Publication number: CN2170880Y
Application number: CN93233415U
Authority: CN
Inventors: 龙熙德
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-03-04
Filing date: 1993-03-04
Publication date: 1994-07-06
Anticipated expiration: 2003-03-04

Abstract

The utility model provides a computer code theft-proof alarm for vehicles, which is particularly applied to theft-proof alarming for the vehicles. The utility model use a computer as a core, and comprises a code input display circuit, a switch circuit, an alarm circuit and an interface circuit. The computer emits on/off commands to an electronic switch according to the fact whether read-out numerical code is consistent with the stored code or not, making an engine start or be unable to start. The utility model has the functions of prompting for error code of twice, alarming for error code of three times and alarming for broken-circuit of the circuits (such as cutting-off). The code has the advantage of high confidentiality, and thus, the theft-proof alarming of the utility model is effective and reliable.

Description

Computer code theft-proof alarm for vehicle

The utility model relates to a kind of monolithic processor controlled burglar alarm of using, and is adapted to the anti-theft alarm of power actuated vehicle especially.

Existing automobile mainly is to adopt the mode of mechanical switch to control the starting ignition circuit, and antitheft is insecure, if the car stealer steal automotive lock switch key, or lock-switch two ends lead cut off the back short circuit, can steal automobile.

To be that design is a kind of utilize computer storage and read password the purpose of this utility model, realizes monitoring, can only be by the password start the engine, thereby be very effective failure-free antitheft alarm system.

The utility model (referring to Fig. 1) is a core with micro computer 1, carries out logic operation and reasoning, handles input/output signal.Contain the password input, digital display circuit 3, electronic switching circuit 4, warning circuit 5, computer 1 connects with password input display circuit 3 through interface circuit 2, utilize a button in order to storage with read password in the password input circuit, alternative different password quantity is extremely huge, it has high reliability to make its password, electronic switching circuit contains an electronic switch and actuator thereof, electronic switch is gone into end and is connected with positive supply, and mouth is connected to the automotive ignition electricity and chews, and whether computing machine conforms to the password that reads according to storage, export the instruction of its break-make of control to electronic switch in good time, computing machine is exported a logic level to warning circuit simultaneously in good time, and the control warning circuit is connected, and sends warning.

Description of drawings: Fig. 1 technical solutions of the utility model circuit structure block diagram, Fig. 2 one embodiment circuit structure diagram.

Be described further below in conjunction with accompanying drawing 2 example illustrated.

Computer 1 can be selected MCS-51 series monolithic such as 80C31 for use.Interface circuit 2 is 8155 for the integrated package compatible with it.Password input display circuit 3 contains character demonstration position and selects actuator 32(to select 75452 integrated packages for use except that an executive component button 31 is arranged), five character display 33(select LA39X1-11 for use), section selects actuator 34(to select 7407 integrated packages for use).Selecting silicon control 3CT104 for use is electronic switching element 41, and its actuator 42 is 7404 chips.Input end at electronic switch also can seal in automobile mechanical switch 44, it has the double anti-theft insurance function more to make automobile, the wire sensor 43 that also has the responsive line broken circuit of an energy in the switch circuit, it selects the 4N35 device for use, its input end (1 pin) is connected to positive supply through resistance R 1, mouth (5 pin) is connected to micro controller system through R2, and 2,4 pin also play ground connection.Warning circuit 5 contains actuator 51,52(all selects 75452 chips for use).Relay J (selecting SRM4,523,190), audio signal generator 53(select 9563 for use), audio signal amplifier 54(selects 386 for use), and loudspeaker 55, actuator 51 input ends connect with micro controller system, export an end of the coil active potential that causes relay J.Similar to switch circuit, be furnished with the derivative sensor 56(that sensitivity opens circuit and select 4N35 for use) and backup power 57,4N35 input end 1 pin connects positive supply through R3, and 2,4 pin also play ground connection, and mouth 5 pin are respectively through resistance R 4, and actuator 52 is connected to the relay coil two ends.

Concise and to the point more below narration operation of the present utility model and demonstration and anti-theft alarm service condition.

Operation and demonstration

1, button: show " L----" character, password is not stored in expression, and button no longer after 10 seconds shows SELF CL.

2, button: when the first figure place sign indicating number shows character, button, just by the first numeral of storage for password, then character begins to show from the next bit number this bit digital, as above operating up to the five-digit number sign indicating number all is that the required character of password ends.(behind the button, if do not store password, 6 minutes demonstration SELF CL).

3, learn off password, press key, password is stored, and shows " C----" character, after 10 seconds, the character SELF CL.Device enters the anti-theft alarm mode of operation.

4, button shows " H----", and the expression storage has password.Button, this character is read, and then the second order digit sign indicating number begins to show, shows that until the five-digit number sign indicating number password of storage ends.

5, button if password is correct, shows " Y----" character; If password bad shows " 1----" character, expression is read error for the first time.Character is closed after 5 seconds.

6, repeat 4,5 steps, if read still mal of password, show " 2----" character, expression input error is for the second time closed character after 10 seconds.

7, repeat 4,5 steps, if read still mal annunciator toot sound of password for the third time.

8, have only by 4,5 steps and read proper password, the just releasing of reporting to the police.

When starting automobile, circuit is if be serially connected with the automotive lock switch, then should first closed lock-switch, and by above-mentioned 4,5 steps operation.

The anti-theft alarm service condition

1, cipher anti theft is reported to the police: see before operation with show to have only when reading password and storing password and conform to, micro controller system is just exported electronic switch turn-on command driving electronic switch, automobile can start.Continuous three input error codes, computer is devoted oneself to work warning circuit and is sent warning to warning circuit actuator 51 output high level.

2, when cutting off power lead, the normal fault of power circuit or car stealer cause open wires, wire sensor 43 is to computer output high level, through the computer calculation process, the output high level is given warning circuit actuator 51, warning circuit is reported to the police, simultaneously, computer is not exported the electronic switch turn-on command, and automobile can't start.

3, stealer cuts off the warning circuit power supply, and the annunciator backup power is automatic power immediately, and wire sensor 5 outputs one high level drives alarm equipment alarm for actuator 52,52 output low levels.

The utility model adopts computer coding mode anti-theft alarm, and is very effectively reliable, realized goal of the invention well.

Claims

1, a kind of vehicle cipher anti theft warning device, it is characterized in that with computer (1) be core, contain password input display circuit (3), electronic switching circuit (4), warning circuit (5), computer (1) connects with password input display circuit (3) through interface circuit (2), there is one in the password input circuit in order to store and to read the button (31) of password, electronic switching circuit (4) contains electronic switch and drives device, the input end of electronic switch connects with positive supply, mouth is connected to the automotive ignition electricity and chews, computer is carried the instruction of controlling its break-make to electronic switch, and computer is also to its logic level of reporting to the police of warning circuit output control in good time.

2, by the described vehicle cipher anti theft of claim 1 warning device, the input end that it is characterized in that the electronic shape switch is serially connected with automotive lock switch 44, also be furnished with the wire sensor 43 that a sensitivity opens circuit in the electronic switching circuit, its input end, mouth are connected to positive supply and computer respectively.

3, by claim 1,2 described vehicle cipher anti theft warning devices, it is characterized in that being furnished with in the warning circuit wire sensor (56) and backup power (57), wire sensor input termination positive supply, mouth is connected to intermediate relay J line mouth volume two ends through resistance (R4), actuator (52) respectively.