CN1113008C - Anti-theft device for automobile - Google Patents
Anti-theft device for automobile Download PDFInfo
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- CN1113008C CN1113008C CN99109016A CN99109016A CN1113008C CN 1113008 C CN1113008 C CN 1113008C CN 99109016 A CN99109016 A CN 99109016A CN 99109016 A CN99109016 A CN 99109016A CN 1113008 C CN1113008 C CN 1113008C
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- circuit
- password
- relay
- cpu
- code generator
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Abstract
The present invention relates to an antitheft device for automobiles. The antitheft device comprises a decoding relay and a password transmitter, wherein the password transmitter is connected with wiring of an automobile body, the password transmitter generates a password and transmits the password to the wiring of the automobile body, the decoding relay is connected in series with a power supply line required when the vehicle body is normally started, and decoding is switched on when the correct password is received. The password transmitter comprises a 5V voltage-stabilizing voltage circuit, a CPU circuit, a voltage detecting circuit, an MOS-FET drive circuit and RLC resonant circuit. The decoding relay comprise a 5V voltage-stabilizing circuit, a reference voltage generation circuit, an RLC resonant circuit, a comparison circuit, a CPU circuit, an EEPROM memory and a break relay push circuit. The present invention has the advantages of convenient installation and good invisibility.
Description
The present invention relates to a kind of alarms and security systems for automobiles, refer to a kind of anti-joyride device that transmits password with the car body distribution especially.
Along with popularizing of vehicle; the loss by theft rate of automobile also relatively greatly improves; therefore; anti-joyride device all is housed on new car now; make car body by improper when moving or destroying; producing alarm with loudspeaker rings; the main line that will start car body simultaneously cuts off; the invader can't be driven away car and bring into play antitheft effect; even some senior car type more is equipped with the anti-joyride device that can input password and reaches and strengthen the anti-theft and anti-robbing effect; but present various cipher anti-theft device is taked as shown in Figure 1 substantially, via the device of device outside, as button; input socket or radio receiver; reach main control system via electric wire; control cut-off relay by main control system via electric wire again, and then the startup of Control of Automobile; igniting or fuel charger, and reach the power-off protection effect.U.S. Pat 5528085 discloses a kind of alarms and security systems for automobiles, and it comprises that is interconnected to a relay for the treatment of protected automobile circuit.These relays have terminal B and C and pair of diodes or the bridge diode that is connected to this automobile circuit device.The negative electrode of one group of diode is connected to a sensor, and the anode of another group diode is grounded.Single channel conduction by these diodes, the cell pressure of this protected circuit are played the effect of auxiliary power bonded assembly and the function of the protected circuit of entail dangers to not.But all there is following shortcoming in the design of prior art:
1, existing anti-joyride device all needs other establishing line, and construction bothers and needs and be installed by technical personnel.
2, be easier to behave in order to the button of input password or socket on the general main frame and realize, so the invader follows line easily and find main frame, main frame is destroyed or pull out, make the automatic conducting of relay at short notice, and lose due antitheft effect from distribution.
3, because anti-joyride device outer leads the formula relay normally is installed in from main frame nearby or near near the car engine key seat, therefore very easy being found removed or short circuit makes its inefficacy and dial, and can't stop the invader fully.
Main purpose of the present invention is to provide a kind of simple installation to need not the professional, just can make the anti-joyride device that signal transmits with the former distribution of car body.
Another purpose of the present invention is to provide a kind of anti-joyride device that transmits code signal with automobile smoking base circuit.
For the present invention that achieves the above object takes following measure:
Alarms and security systems for automobiles of the present invention mainly comprises:
One cipher code generator connects the car body distribution, and it produces password and through the D/A conversion, transfers signals on the car body distribution;
Described decoding relay is serially connected in car body when normally starting in the required supply line, when receiving proper password, and the decoding conducting.
Wherein: described cipher code generator comprises:
One 5V mu balanced circuit, a cpu circuit, a voltage detecting circuit, a MOS-FET promote circuit, a RLC resonance circuit;
Voltage detecting circuit, cpu circuit, RLC resonance circuit connect successively; The RLC resonance circuit is connected on the 12V power lead; The 5V mu balanced circuit connects voltage detecting circuit and cpu circuit respectively;
Described decoding relay comprises:
One 5V mu balanced circuit, a generating circuit from reference voltage, a RLC resonance circuit, a comparator circuit, a cpu circuit, an EEPROM memory body and a cutoff relay promote circuit;
Cpu circuit connects comparator circuit respectively, cutoff relay promotes circuit and EEPROM memory body; Generating circuit from reference voltage connects the RLC resonance circuit; Generating circuit from reference voltage and RLC resonance circuit connect comparator circuit respectively; The 5V mu balanced circuit connects generating circuit from reference voltage, cpu circuit, comparator circuit and EEPROM memory body respectively; The 12V power lead connects 5V mu balanced circuit and RLC resonance circuit respectively.
Wherein, the transmission of described password is to represent " 0 " and " 1 " respectively with two kinds of different frequency signals.
Wherein, described cipher code generator also can connect one and opens the external control circuit of control so that external control circuit can be controlled the decoding relay through cipher code generator with remote signal.
It is as follows to the detailed description of the invention to reach accompanying drawing in conjunction with specific embodiments:
Description of drawings:
Fig. 1 is the circuit block diagram of existing alarms and security systems for automobiles.
Fig. 2 is the circuit block diagram of alarms and security systems for automobiles of the present invention.
Fig. 3 is the circuit block diagram of cipher code generator among the present invention.
Fig. 4 is the circuit diagram of cipher code generator among the present invention.
Fig. 5 is the circuit block diagram of decoding relay among the present invention.
Fig. 6 is the circuit diagram of decoding relay among the present invention.
Fig. 7 transmits the scheme drawing of password with smoking base for the present invention.
As shown in Figure 2, the present invention mainly comprises with the anti-joyride device of car body distribution transmission password: a cipher code generator 1 and at least one decoding relay 2; Wherein cipher code generator 1, can produce password and is loaded on the car body distribution 3 through D/A conversion, and decoding relay 2, on the arbitrary position in the time of can arbitrarily being located at car body and normally starting in the middle of the required supply line 31, and can be when receiving proper password through the decoding conducting; By this, cipher code generator 1 and 2 on relay of decoding need not to add in addition distribution when anti-joyride device was installed, and can utilize former car distribution 3 to transmit signal, made to install to be tending towards simple, and the user is also capable of automatic assembling, owing to do not increase distribution, so be difficult for being found.
See also Fig. 3,4, it is respectively the circuit block diagram and the circuit diagram of cipher code generator among the present invention; Cipher code generator 1 in this device comprises: a 5V mu balanced circuit 11, so that former car distribution 12V power source conversion is become 5V, use for cipher code generator 1; One cpu circuit 12 is to produce specific square wave code signal; One voltage detecting circuit 13, whether stable to detect 5V voltage, to provide cpu circuit 12 replacement (RESET) signals, CPU is restarted; One MOS memory (MOS-FET) promotes circuit 14, and its electric current with code signal, voltage are amplified; One RLC resonance circuit 15 is made high frequency modulated with signal, is coupled to through voltage transformer T1 on the 12V power lead of former car distribution 3.
Shown in Fig. 5,6, decoding relay 2 comprises: a 5V mu balanced circuit 21 changes into the 5V constant voltage power suspply with the 12V of former car distribution 3 and uses as power supply; One generating circuit from reference voltage 22 is producing the reference voltage of 2.5V, for comparator circuit 24 benchmark of making comparisons; One RLC resonance circuit 23 takes out high-frequency signal from the 12V power supply, and the filtering integer is amplified, and takes out set specific frequency signal; One comparator circuit 24 zooms into square-wave signal with the signal integer that leaches; One cpu circuit 25 reads in this square-wave signal and distinguishes as password, with the relay controlled of indication and promote circuit 26, so that connect or open circuit; One EEPROM memory body 27, memory cipher and the required data of storage CPU in it.
Take the design to need not to add in addition distribution fully, can be with decoding relay 2 according to judging the latent supply line 31 middle any positions that thickly are installed on the required igniting of automobile starting, startup and petrolift of selectivity voluntarily.
See also shown in Figure 4, when work, when starting cipher code generator 1 as normally entering, integrated circuit U3 wherein (CPU) can produce the square wave password of characteristic frequency, as square wave representative " 1 " with 55KHz, and with the square wave of 58KHz representative " 0 " (certainly can also other frequency signal substitute), quartz crystal X1 wherein, resistance R 7, capacitor C 1 and C9 form the oscillating circuit of CPU, C11 is a filter capacitor, whether LED 1 display password signal is in the transmission state, adopting the square wave representative " 0 " of different frequency is for the ease of modulation treatment with " 1 ", and be loaded into distribution 3, as shown in Figure 7, and be used for preventing the interference of external assorted letters such as car engine, deliver to after square-wave signal produces and promote circuit 14, square wave is amplified, make enough electric currents promote next stage resonance circuit 15, resonance circuit 15 is by inductance L 2, capacitor C 7, C5 and C6 constitute, resistance R 3 and R2 play the impedance match effect, wherein, signal forms sinusoidal waveform through the D/A conversion, and resistance R 2 backs that arrive are scalable, make it can have enough electric energy to be coupled to output primary through the elementary circle of voltage transformer T1, make the code signal of sinusoidal waveform be loaded into car body distribution 3+the 12V electric wire on, this moment is when the of short duration transmission of CPU in the time, all have code signal to exist on the 12V electric wire of complete vehicle, but so far-end no matter be located at the 12V electric wire received signal of the former car distribution 3 of decoding relay 2 equal mats of any position.
As shown in Figure 6, during reception, be coupled with inductance L 82 through voltage transformer T2, capacitor C 86/C87, C88/C89, C10, resistance R 92,93 and the resonance circuit 23 formed of inductance L 83 and obtain the code signal of sinusoidal waveform, wherein, signal may produce loss more or less in transmission, even may only remain 0.1V when arriving decoding relay 2 sometimes, but when resonance circuit 2, then 12V can be filtered, and the sinusoidal waveform code signal of required frequency is amplified to about 2V, and deliver to the secondary comparator circuit 24 that is constituted by op amp U4 and resistance R 86, by resistance R 91, R92, the generating circuit from reference voltage 22 that R93 and capacitor C 94 constitute produces reference voltage, and through comparing, the square wave code signal that the sinusoidal waveform code signal of former 2V is transformed into 5V is delivered to next stage cpu circuit 25, crystal X21 wherein, capacitor C 21, C22 constitutes oscillating circuit, U2 is an EEPROM memory body 27, the data that its stored password and CPU are required, when the obtained password of CPU interpretation is correct, control relay 26 and promotion circuit turn-on thereof, but the car body normal ignition starts operation, on the contrary control relay 26 and promote circuit and keep opening circuit car can't be started then.
As Fig. 2,3, shown in 5, anti-joyride device of the present invention is in practicality, password projector 1 can be a portability individuality independently, antitheft time side contacts with car body distribution 3 in releasing, or in addition with one can be external control circuit 16 to drive it, for example open control or the circuit of cipher code generator 1 is contained on the existing Car Burglar Alarm main frame of existing various remote control equipment (RCE)s with remote signal, make it except that the existing anti-theft feature of tool, more be provided with the reinforcement anti-theft effect of together latent close formula, after even its anti theft host being found pull out, and the decoding relay still is in off state and the outstanding antitheft effect of tool.In addition, for conveniently generally being unwilling to change the user that bit selecting is blocked former car distribution 3, decoding relay 2 of the present invention can directly be set as and former car institute tool fuel oil, startup and the identical plug of ignition relay, the user can install voluntarily, as long as former relay is removed, change the purpose made decoding device 2 that continues again, just can reach and conceal close and respond well anti-theft feature.
As shown in Figure 7, below provide one to utilize former car to be equipped with the assembling embodiments of the invention, wherein, this kind comprised with the anti-joyride device that the car body distribution transmits password: one has the cipher code generator 1 of the plug 41 that lights a cigarette, it is portable independent individual, and it produces password and password is reprinted on the car body distribution 3 through the D/A conversion through the automobile socket 4 that lights a cigarette; Decoding relay 2, in the middle of the required supply line 31 on arbitrary positions, making can be through the decoding conducting when receiving proper password in the time of can arbitrarily being located at automobile and normally starting; By this, when wanting start a car, only need Portable is had the password projector 1 of the plug 41 that lights a cigarette, insert in the socket 4 that lights a cigarette of the former outfit of automobile, can be by the 12V power supply of smoking base 4, password is downloaded to+12 electric wires on, and then the decoding relay 2 that makes far-end through the transmission of former car distribution 3 accesses password and conducting starts vehicle from the 12V electric wire, because smoking base 4 is every outfit that car all has, no any extra change or additional the installation under the distribution, be cited as the transmission of anti-theft cipher dexterously, like this, see, with originally knowing that this car has been equipped with anti-joyride device by appearance.
Compared with prior art, the present invention has following effect:
In sum, anti-joyride device of the present invention is simple in structure, and is easy to manufacture, is convenient to install, and the most important thing is to be difficult for for the invader finds latent close anti-joyride device, so can strengthen anti-theft feature owing to utilize former car distribution to install.
More than narration is to borrow preferred embodiment that architectural feature of the present invention is described, is not to be used to limit protection scope of the present invention.
Claims (8)
1, a kind of alarms and security systems for automobiles mainly comprises:
One cipher code generator connects the car body distribution, and it produces password and through the D/A conversion, transfers signals on the car body distribution;
Described decoding relay is serially connected in car body when normally starting in the required supply line, when receiving proper password, and the decoding conducting.
2, anti-joyride device according to claim 1 is characterized in that:
Described cipher code generator comprises:
One 5V mu balanced circuit, a cpu circuit, a voltage detecting circuit, a MOS-FET promote circuit, a RLC resonance circuit;
Voltage detecting circuit, cpu circuit, RLC resonance circuit connect successively; The RLC resonance circuit is connected on the 12V power lead; The 5V mu balanced circuit connects voltage detecting circuit and cpu circuit respectively;
Described decoding relay comprises:
One 5V mu balanced circuit, a generating circuit from reference voltage, a RLC resonance circuit, a comparator circuit, a cpu circuit, an EEPROM memory body and a cutoff relay promote circuit;
Cpu circuit connects comparator circuit respectively, cutoff relay promotes circuit and EEPROM memory body; Generating circuit from reference voltage connects the RLC resonance circuit; Generating circuit from reference voltage and RLC resonance circuit connect comparator circuit respectively; The 5V mu balanced circuit connects generating circuit from reference voltage, cpu circuit, comparator circuit and EEPROM memory body respectively; The 12V power lead connects 5V mu balanced circuit and RLC resonance circuit respectively.
3, anti-joyride device according to claim 2 is characterized in that, the transmission of described password is to represent " 0 " and " 1 " respectively with two kinds of different frequency signals.
4, anti-joyride device according to claim 2 is characterized in that, described cipher code generator also can connect one and open the external control circuit of control so that external control circuit can be controlled the decoding relay through cipher code generator with remote signal.
5, anti-joyride device according to claim 2 is characterized in that, described decoding relay is set as and former car institute tool fuel oil, startup and the identical plug of ignition relay.
6, anti-joyride device according to claim 1 is characterized in that, described password projector can be located at or be connected on the existing Car Burglar Alarm main frame.
7, anti-joyride device according to claim 1 is characterized in that, described cipher code generator is an independent portable individuality.
8, anti-joyride device according to claim 1 is characterized in that, described cipher code generator can shape as the plug that lights a cigarette.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99109016A CN1113008C (en) | 1999-06-11 | 1999-06-11 | Anti-theft device for automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99109016A CN1113008C (en) | 1999-06-11 | 1999-06-11 | Anti-theft device for automobile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1277119A CN1277119A (en) | 2000-12-20 |
| CN1113008C true CN1113008C (en) | 2003-07-02 |
Family
ID=5273641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99109016A Expired - Fee Related CN1113008C (en) | 1999-06-11 | 1999-06-11 | Anti-theft device for automobile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1113008C (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5528085A (en) * | 1994-04-22 | 1996-06-18 | Hsiang; Sheng-Hsiang | Anti-theft device for vehicle using interrupt relays and diodes |
| US5819869A (en) * | 1996-07-25 | 1998-10-13 | Horton; Timothy D. | Pager actuated automobile disabling system and method for using same |
-
1999
- 1999-06-11 CN CN99109016A patent/CN1113008C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5528085A (en) * | 1994-04-22 | 1996-06-18 | Hsiang; Sheng-Hsiang | Anti-theft device for vehicle using interrupt relays and diodes |
| US5819869A (en) * | 1996-07-25 | 1998-10-13 | Horton; Timothy D. | Pager actuated automobile disabling system and method for using same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1277119A (en) | 2000-12-20 |
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Granted publication date: 20030702 Termination date: 20140611 |
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| EXPY | Termination of patent right or utility model |