CN2142803Y - Anti-theft device for motor vehicle - Google Patents

Abstract

The utility model discloses a motor vehicle anti-theft device, it seals indispensible ignition coil together in a shell 7 in decoder, controller and vehicle ignition system, seals simultaneously another set of decoder, controller and control oil circuit's solenoid valve together in another shell 9, wants to put through ignition system and oil piping system, can only rely on the password key that can't duplicate to insert and draw out the password receiving arrangement outside shell 7 and the shell 9, inputs the correct password and just can play the effect. If the thief does not have a password key, the thief can not do any help only by means of stealing the original vehicle key or adopting a master vehicle key or short-connecting an ignition switch or short-connecting an automatic switch outgoing line of the existing anti-theft device and the like.

Description

Anti-theft device for motor vehicle

The utility model relates to a kind of anti-joyride device, and it is suitable for various self-propelled vehiclees---as automobile (containing spark ignition engine and diesel engine), and motor bike etc. antitheft.

Alarms and security systems for automobiles of the prior art, or with encoded keyboard 1 key feeding cipher, through decoder 2 decodings, the person of closing can start a machine by controller 3 cut-in point fire coils 14, and the person of not conforming to is point of cutoff fire coil 14 still then, and reports to the police simultaneously; Or with form launching code such as wireless, infrared, ultrasonic, after receiving device receives corresponding encoded, control relay adhesive, its contacting ignition system circuit; Or after receiving corresponding encoded, ignition system circuit is connected in 17 conductings of control silicon control, and their basic composition form as shown in Figure 1.Their common feature is, for the people who is familiar with automobile circuit and controller, only need anti-theft controller 4 outsides directly with Fig. 1 in 5,6 two short circuits get up or 25,27 two o'clock pulled down from 22,23 two, and 25,27 two be connected together (being equivalent to circuit restoration) can be started a machine, steal vehicle, this class anti-joyride device is only cured the symptoms, not the disease.

Other adopts the Car Burglar Alarm of remote control mode such as wireless, infrared, ultrasonic, for easy to carry, remote controller is all done very for a short time, battery use capacity has been subjected to considerable restraint like this, when emission state is worked down in addition, the circuit power consumption is bigger, in case cell pressure is reduced to remote controller can't normal operation the time, controller work will be not normal.To cause vehicle startup not get up and cause delay.

The purpose of this utility model is to provide a kind of all that effectively prevent from present stage to be found to steal driver's sections (1. stealing bitting 2. usefulness master keys 3. direct shorted ignition switch 4. usefulness leads short circuit Car Burglar Alarm switch outside existing anti-theft device for vehicle, switching on the ignition circuit) power actuated vehicle is stolen.And coding key self need not charged source, the drawback that electric voltage dropping causes vehicle startup not get up when having avoided the charged source of coder self.

Anti-theft device for motor vehicles of the present utility model, its maximum characteristics are with decoder 2, controller 3 and high-tension coil 14(or transistor ignitor 15, or be used for the electromagnetic valve 16 of control vehicle oil circuit) shut respectively in the enclosure together, see Fig. 2 a-2c, Fig. 2 a is with decoder 2, and controller 3 and high-tension coil 14 are shut the situation in shell 7 together; Fig. 2 b is for shutting decoder 2, controller 3 and transistor ignitor 15 together situation shell 8 in, and Fig. 2 C shuts situation in shell 9 with decoder 2, controller 3 together with the electromagnetic valve 16 of control vehicle oil circuit.Improved self-propelled vehicle partial circuit signal as shown in Figure 3.Adopt robber's car trick of passing through usefulness as the robber, for example: make ignition lock 10 closures with the key or the omnipotent car key of joining steathily, or 10 two short circuits of ignition lock are got up etc. with lead, when vehicle is stolen in attempt, owing to do not insert corresponding cipher key in the three core sockets 11, decoder 2 and the controller 3 shut in shell 7 and shell 9 are not worked, and their contact J30 cuts off high-tension coil 14 primary circuits in shell 7, can't produce strong spark; J40 cuts off electromagnetic valve 16 coil circuits of control vehicle oil circuit in shell 9 simultaneously, and oil circuit gets clogged, and can't produce mixed steam, causes driving engine to start.Just because of contact J30, J40 and high-tension coil 14, electromagnetic valve 16 are shut respectively in shell 7, in the shell 9, the robber is under the prerequisite of no proper password key, to not have any unique skill outside shell can connect J30, J40 in shell automatically, more not having way directly is wired to high-tension coil 5 ends or is directly connected to electromagnetic valve 12 ends, like this, in the unique channel that shell external enwergy control ignition circuit system is connected or oil circuit is connected, just can only lean on the corresponding password of coding receiving device (i.e. three core sockets 11) input outside drawing shell just can prove effective.See shown in Fig. 3,4 that wherein the part that fences up with heavy line represents to be shut the parts in this shell.Because coding key can't dispose in the street, and its encoding amount is difficult to decode up to 4,200,000 kinds more than.Especially when making key, coder is potted in the plastics key holder by epoxy resin, as shown in Figure 5, is difficult to obtain its definite coding, and imitated so almost becoming may not.

In the solid wire frame of Fig. 5 is encode circuit, heavy line has been ticked the profile of plastics key holders, three-prong plug 18 hot pressing is in advance beaten the position of oblique line at the plastics key holder, and the positive-negative power of coder and signal output are connected respectively to 19,20,21 ends of three-prong plug 18, and its power supply is taken from three core sockets 11.

Fig. 1 is a prior art car alarm guarding portion schematic block diagram;

Fig. 2 (a) shuts scheme drawing in housing together with decoder, controller and high-tension coil;

Fig. 2 (b) shuts scheme drawing in housing together with decoder, controller and transistor ignitor;

Fig. 2 (c) shuts scheme drawing in housing together with decoder, controller and electromagnetic valve;

Fig. 3 is the anti-theft device for motor vehicles structural representation;

Fig. 4 is the anti-theft device for motor vehicles electrical schematic diagram;

Fig. 5 is a coder theory structure scheme drawing;

Fig. 6 is the three core socket scheme drawings that the night travel indicator lamp is housed;

It is as follows now to be described with reference to the accompanying drawings the utility model embodiment:

Behind the socket 11 among cipher key insertion Fig. 4 of Fig. 5, if at this moment the driver with car key with ignition lock 10 closures, the voltage of vehicle battery is added to the input end of DC voltage-stabilizing IC7805 by normally closed contact J10, the J11 of relay J 1, and the 5V power supply of its output is added to decoding IC1, the V of IC2 _DDAnd V _SSHold, be added to the V of coding IC13 simultaneously by the contact of socket 11 _DDAnd V _SSEnd, so coding IC13 work, the pulse code of its output is through contact 24 and emitter follower T1, T2 input decoding IC1, the IC2 of socket 11, when decoding IC1, IC2 receive wrong pulse code, their VT end still keeps low level, SCR1, SCR2 all can't triggering and conducting, and ignition system and oil piping system then still are in blocking state, and machine can't start.When decoding IC1, IC2 receive correct pulse code, their VT end output high level, thus trigger controllable silicon SCR 1, SCR2 conducting, relay J 1, J2 adhesive, the normally closed contact J of J1 ₁₀, J ₁₁Disconnected the feed circuit of volume, decoding scheme, in case the self-induced e.m.f that the stop fire coil produces causes coding and decoding IC soft breakdown, and the open contact J of J1, J2 ₁₂, J ₂₀Closed self-locking, protection SCR1, SCR2 exempt from the harm of the self-induced e.m.f of high-tension coil generation.The open contact J of J1, J2 ₁₃, J ₂₁Closure has been connected the coil circuit of main relay J3, J4 respectively.J3, J4 adhesive, the open contact J of J3 ₃₀The contact connection of the outer platinum 6 of elementary and shell 7 in the shell of shutting 7 with high-tension coil, thus ignition system circuit connected, the normally open contact J of J4 ₄₀Closed in the shell of shutting 9, the electromagnetic valve coil DZ of control oil channel gets electric adhesive.Thereby open oil circuit, work as the driver this moment and depress starting switch (some starting switch and ignition lock are integrated), because the on of circuit oil circuit just can be started a machine.When adopting transistor ignitor 15, also can disconnect pick-up coil 26, principle repeats no more with last identical.Referring to Fig. 2 b.The effect of T1, T2 among Fig. 4 is on the one hand for isolating coder; The equivalent impedance of utilizing the high characteristics of emitter follower input impedance to improve the two-way decoder circuit and connect on the other hand is to reduce the load of encode circuit.

As everyone knows, there is a difference between the operating current of relay and electromagnetic valve and the release current, operating current is bigger, and release current is less, usually after their adhesives, just remain on the long-term work of operating current value always, this has not only increased power consumption, and the coil long-term work easily produces temperature rise in bigger operating current value, unfavorable to the reliability that improves controller, for this reason, in relay coil circuit or electromagnetic valve coil circuit, seal in the RC parallel branch respectively to reduce power consumption, and can avoid the coil long-term work to produce superheat, thereby improve reliability.Its principle is described below: with Fig. 4 repeat circuit J1 branch road is example: when the SCR1 triggering and conducting, because the voltage at capacitor C 1 two ends can not suddenly change, therefore in the moment of SCR1 conducting, C1 is equivalent to short circuit, the adhesive in having provided relay J 1 enough operating currents, after process of charging finishes, C1 is equivalent to open circuit, plays metering function so resistance R 7 is advanced by string in the coil circuit of J1, has reached the reduction power consumption, reduce temperature rise, improve the purpose of controller reliability.R9C3, R8C2, R10C4, the principle of parallel branches such as R12C6 repeats no more with last identical.

This anti-joyride device uses very simple, and is convenient, as long as cipher key shown in Figure 5 is inserted in the socket 11.(night driving is handled easily, has one emitting led 28 to indicate in the socket 11, and the assurance cipher key can wrong plug, sees Fig. 6) other driving program is then just the same when not adorning anti-joyride device, repeats no more.

Claims (4)

1, a kind of anti-theft device for motor vehicles is characterized in that including:

Be potted in the coding key that the coding IC in the key holder shape plastic casing and be connected and is exposed to the three-prong plug outside this box by epoxy resin;

The housing of making and shutting by AA all purpose adhesive or epoxy resin or ultrasonic technique by sturdy material;

Be coupled, be used to admit the socket of described coding key plug with the lead of drawing from described enclosure interior;

Shut decoder, controller and controlled substance in described enclosure interior, the input end of described decoder is by the control signal of lead reception from described socket, the output of described decoder and the input of described controller are coupled, and described controlled substance is controlled in the output of described controller.

2, anti-theft device for motor vehicles according to claim 1 is characterized in that described controlled substance is high-tension coil or transistor ignitor or the electromagnetic valve that is used for control oil channel.

3, anti-theft device for motor vehicles according to claim 1 is characterized in that the power supply of described coding key is directly taken from the storage battery of vehicle own by described socket.

4, anti-theft device for motor vehicles according to claim 1, it is characterized in that: all seal in the RC parallel branch in all relay coil circuit and the electromagnetic valve coil circuit in the described control circuit, and utilize the positive-negative power of normally closed contact cut-out volume automatically, decoding scheme when its adhesive of relay.

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