JPH0449158B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a vehicle anti-theft device.

In particular, the present invention is designed to issue an alarm as soon as the door of the vehicle is opened, thereby accurately achieving the purpose of eliminating thieves who try to enter the vehicle, while also disabling the alarm circuit (stopping an alarm that is already activated). This system uses a code method to disable operation when a person who is not the thief gets on the vehicle, and is characterized by having it involve the operation of a secret code switch with a predetermined number. By making it possible to reliably check whether a person is boarding a vehicle without memorizing the information, and by adopting a code system that relies on memory, the intended purpose of preventing theft can be achieved accurately without complicating the device and operation. This is how it was done.

In addition, the present invention allows the driver to operate the secret code switch installed in the vehicle without any hindrance by presetting the opening angle of the door at which the door switch operates, and by opening the door below the opening angle. This further ensures the prevention of theft by vehicle thieves who are unaware of this.

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

In the diagram, DS ₁ , DS ₂ , DS ₃ , and DS ₄ are displayed when the doors (assuming 4 doors) are opened to allow entry.
This is a door switch that turns on and turns off when closed. P is the door switch ON (i.e. door open)
This is a relay for starting an alarm circuit (in the embodiment, a klaxon sounding circuit and a warning light lighting circuit described later) that is activated by the power supply.One end of the relay P is connected to the power supply +B, and the other end is connected to the resistors R ₂ and R ₃ and the capacitor C. and the other end of the charging circuit is connected to the door switch via a diode _D1 .
DS ₁ and DS ₂ are connected in parallel to door switches DS ₃ and DS ₄ , respectively, via a diode D ₂ .

By means of the circuit described above, when either door is opened, capacitor C is charged with a fixed time constant, and relay P is activated during this charging.

Ps is a relay switch that is turned on when the relay P is activated, and SP is an existing horn that sounds when the relay switch is turned on.

There are two existing methods for making a horn sound: a relay method and a grounding method.
The power supply +B side of SP can be turned ON and OFF by relay KR, and relay KR is activated by ON operation of handle switch HS, and the relay switch KRs
By turning on the crankshaft SP, the operating current is passed by connecting the crankshaft SP to the power supply +B.The latter allows the ground side of the crankshaft SP to be turned on and off using the handle switch HS, and by turning on the The operating current is passed to the crankshaft SP.

The relay switch Ps is connected in parallel with the handle switch HS in any of the above-mentioned crankshaft systems so as to pass an operating current to the crankshaft SP. The drawing shows a relay-type klaxon sounding circuit. In the above example, the sounding circuit of the horn SP already installed in the vehicle is used as the alarm circuit, but a dedicated audio alarm may also be provided separately.

S is a self-holding relay for the engine ignition circuit cutoff and alarm light lighting circuit, one end of which is connected to the power supply +B via a resistor _R1 , the other end of which is grounded via the relay switch Ps, and the relay P for starting the alarm circuit. When the same switch Ps is turned ON by the operation of , the circuit is closed and the circuit is activated. The self-holding relay S is a switch S ₁ ,
_S2 , relay switch _S1 turns from OFF to ON when relay S operates in conjunction with the operation of relay P, and by connecting relay S to ground and passing current, relay P stops operating. Even if the same relay S
Switch S 2 has the role of self-maintaining the operating state of , and the role of closing the illuminated alarm circuit (closing the circuit of alarm light W), and the switch S ₂ is turned from the ON state to OFF by the operation of the relay S. The route between the engine key switch ES and the ignition primary power supply T is cut off, making it impossible to ignite the engine in the event of theft. In the embodiment, a resistor _R4 is connected in parallel with the relay switch _S2 to allow the vehicle owner to flow the minimum current necessary to slowly rotate the engine and warm it up.

Further, Cs is a secret code switch for canceling the alarm circuit, which is memorized and operated by the vehicle owner. The secret code switch Cs is made up of a series circuit of a plurality of switches, for example, switches up to code No., as shown in the figure, and the secret code switch Cs
One end (switch end) is connected to the positive side (power supply +B side) of the self-holding relay S for the engine ignition circuit cutoff and alarm light lighting circuit, that is, between the relay S and resistor _R1 , and the other end (switch end ) to ground. Furthermore, a set of switch code No. to medium switch code No. of secret code switch Cs is set as a secret switch code for canceling the alarm circuit.
No., each release secret switch code No.
,, keep the switch OFF at all times,
Code No. or switch (in the example, code
The negative contact side of switch No.) is connected to the negative side of relay S via diode _D5 , and as a result, connected to ground via relay switch Ps,
Connect the negative contact side of the switch with the same code number to a diode.
D ₆ is connected to the positive contact side of the switch with the code No. via the capacitor C of the charging circuit, and connects to the ground through the switch with the code No. to form the charging circuit. . The switch to which the positive side of the capacitor C is connected is connected to the negative contact of the switch with a code number lower than the switch with the final code number in the secret code switch Cs, and the switch to which the negative side of the capacitor C is connected is the one mentioned above. Cord No. after the switch to which the positive side is connected.
It is fine if it is a switch.

The secret code switch Cs is an automatic reset type push switch, and is a secret code switch with a predetermined code number among the secret switches.
By turning ON once, all the above-mentioned alarm circuits, that is, the sounding and lighting circuits of the horn SP and alarm light W, are canceled, and if they are already sounding and lighting, they are stopped and the operation is started at the same time. To prevent an alarm from being emitted even if a person opens the door and gets into the car.

As an example, the secret code switch Cs is installed in a place where it can be operated when riding, for example, close to the inside of the driver's door, and when the driver gets in the car, he inserts his hand inside the door and operates the secret code switch Cs. Set the opening angle of the door that turns on the door switch DS ₄ so that the door switch DS 4 can be turned on. That is, for example, if the opening angle of the door is set to about 20 degrees, it will be easy to insert your hand into the vehicle, but it will not be possible to get into the vehicle. The door opening angle at which such a door switch is turned on is set in advance, and when getting into the vehicle, first open the door slightly, insert your hand inside, and press the secret code switch Cs, especially the code number in the example. Operate the secret code switch to cancel the alarm circuit, and then the door can be opened freely and you can get on board.

The operation of the present invention will be explained in more detail below.

First, if a thief opens the driver's side door to get into a parked vehicle without locking the door or removing the key, +B→P→C→D ₂ →DS ₄ →Ground
. . . The circuit "1" is closed and activates the alarm circuit starting relay P during the charge time of the capacitor C set by the resistors R ₂ and R ₃ . As a result, by turning on the relay switch Ps, the +B → KR → D ₃ → Ps → Earth ... "2" circuit is closed and the relay KR is activated, and the switch KRs is activated due to the activation of the relay KR. As a result of ON,
The system energizes the Klaxon SP and makes it sound to alert outsiders that there is a risk of vehicle theft. The time for this ringing is the time for charging the capacitor C.

As a result of turning ON the relay switch Ps by closing the above circuits "1" and "2", +B → R ₁ → S → D ₄ → Rs → Earth
...The circuit "3" is closed and the self-holding relay S for the engine ignition circuit cutoff and alarm light lighting circuit is activated, and the operation of this relay S turns relay switch S ₁ from OFF to ON, and the same switch S ₂ from ON to OFF,
When relay switch S ₁ is turned on, +B→S→S ₁ → Earth ... ``4'' relay S self-holding circuit is formed, and at the same time, +B → W → S <sub>1</sub> → Earth ... ``5'' circuit is formed. The user closes the door, turns on the warning light W, and holds it to let outsiders know that he or she is a plagiarist.

Further, when the self-holding relay S is activated, the relay switch _S2 is turned off to cut off the line between the ignition primary power source T and the engine key switch ES, making it impossible for the thief to ignite the engine.

As mentioned above, the relay switch S ₂ and the resistor
Resistor R ₄ is connected in parallel with R ₄ , but due to its resistance setting, only the minimum current that is required to rotate the engine slowly to warm it flows through the resistor R 4. Even if you leave your car with the car inserted, the thief will not be able to start the car.

When the plagiarist closes the door in surprise, the door switch
Since DS ₄ is turned OFF, the circuits "1" and "2" are opened and the alarm circuit that sounds the horn is cancelled, but the circuits "4" and "5" are self-contained even after the door is closed. When the relay switch S ₁ is held ON, the warning light W continues to be turned on, and the ignition primary power supply is continued to be cut off when the relay switch S ₂ is OFF.

Next time the driver gets in the car, use the secret code switch Cs to cancel the alarm circuit, as described above.

As explained above, the door switch DS ₄ can be used by inserting your hand inside the door to activate the secret code switch.
The same switch DS ₄ so that you can operate CS
The opening angle of the door that turns on is set in advance.

Passenger seat or rear seat door switch DS ₁ ,
It is a good idea to set the same opening angle for DS ₂ and DS ₃ .

Now, open the driver's door switch DS ₄ below the set opening angle, insert your hand, and read the switch code No. in the secret code switch Cs that has been memorized.
Push the switch to turn it ON.

As a result, +B → R ₁ → Cs' → D ₅ → S's negative side → S ₁ → Earth...The circuit of "6" is closed and the negative side of relay S is short-circuited, causing a voltage drop. Cancel the operation of S. As a result, the circuits "3", "4", and "5" closed by the plagiarist are released, the alarm circuit, that is, the alarm light is turned off, and the switch _S2 is turned on.
This allows the engine to be driven and the vehicle to run.

At the same time as above (when the switch code No., , is turned ON) +B→R ₁ →Cs →D ₆ →C→Cs →Earth...The circuit of "7" is closed, and the circuit of "7" is closed and connected to the capacitor C. Charge. This makes it impossible to close the circuit "2" which activates the alarm circuit starting relay P.

That is, the charging time constant of capacitor C is determined by resistor _R1 , and once the code No.
Charging is completed instantly (because it is a self-resetting switch). When charging is completed, the capacitor C is discharged in the discharge circuit from C(+) → R ₃ → C(-), but the discharge time constant is set sufficiently long by the resistor R ₃ so that the capacitor C is discharged during this discharge. The driver is allowed to open the door for boarding, and the discharge of the capacitor C is stopped by opening the door. When the door is opened, door switch DS ₄ turns on, but resistance R ₂ ,
The current that is shunted to _R3 and flows to relay P is a weak current, and a current large enough to operate it is not flowing. Therefore, the circuits "1" to "5", which are conditioned on the activation of relay P, become inoperable, and even if the driver opens the door and gets into the vehicle, no warning sound is emitted, and the engine is not driven. Allows vehicles to run.

Next, to explain the case where the driver gets off the vehicle, when the driver gets off the vehicle, the driver always depresses the brake pedal last, and a switch BS is provided that is turned on by depressing the brake pedal. A _relay B is provided that operates when the brake pedal switch BS is turned on, and relay switches b ₁ and _{b 2} are turned on when the brake pedal switch BS is turned on. The circuit ``1'' of the relay P is closed and the capacitor C is charged in a circuit ``8'' which is different from the circuit ``1'' of the relay P. As a result, the same effect as in the case of turning on the switch of code No. in the secret code switch Cs described above is produced, and the relay P for starting the alarm circuit is not activated. Therefore, even if the door DS ₄ is fully opened, the driver can exit the vehicle without generating an alarm, just as in the case of the driver getting on the vehicle.

Furthermore, in the illustrated circuit example, the switches ' and ' which are interlocked with, for example, the switch of code No. in the secret code switch Cs are connected to the relay P and the switch of code No.
It is inserted between the switches. ’ switch is normally closed, ’ switch is always open, code No.
The former is turned off and the latter is turned on by operating the switch.
It turns into When the secret code switch Cs is operated, the switch ' is turned OFF, so the circuit of the relay P is not closed.

The switch No.' above is a switch installed to prevent the passenger from driving out of control.If a car rides out of control, pressing the switch with code No. will turn on the switch No.' in conjunction with this. ＋B→P→D ₇ →′→′→→Earth
...The circuit "9" is closed and the relay P is activated, so the circuits "1" to "5" are closed and the alarm circuit is activated in the same way as when a vehicle thief opens the door, preventing danger. Notify the outside. Furthermore, since the relay switch _S2 is turned off when circuit "3" is closed, a circuit of resistor _R4 is formed and the engine output is reduced. At this time, if the secret code switch of code number is pressed, the switch ' provided in the ignition circuit which is linked to the switch of that number changes from ON to OFF and stops the engine.

Furthermore, there are people who are allowed to get on the vehicle from outside and people who are not allowed to get on the vehicle, but for those who are allowed to get on the vehicle, as a means to prevent the above-mentioned alarm circuit from operating, switch No. is set to the brake pedal switch.
Insert in parallel with BS. If you press the switch resulting from this in the car, the brake pedal switch will be activated when exiting the car.
Disables the alarm circuit in the same way as stepping on the BS.

Also, if you are forced to ride by someone you do not want to allow, just leave the No. switch as it is, and when you open the door to refuse to ride, circuits ``1'' to ``5'' will be activated in the same way as in the case of the thief. ' will be closed and a warning will be issued.

Furthermore, if the No.' and ' switches already described in the embodiment are provided in parallel with the relay switch Ps that opens and closes the above-mentioned crankshaft relay KR circuit, when the code No. switch is pressed and the switch ' is turned on, the crankshaft relay KR is turned on. comes and the klaxon SP continues to sound, alerting the outside world to the danger. Said code No.
When operating the switches , , , the switch ' is turned off, so the horn SP will not sound.

In addition, if a person who steals the device destroys the device, the electrolyte tube EP installed in the ignition current supply line will break and cut off the ignition current. The present invention has been described in detail in accordance with the illustrated embodiment, and the present invention provides a vehicle anti-theft device in which when a door is opened, a door switch is turned on to close an alarm circuit and issue an alarm. It is characterized by having a configuration in which the alarm circuit is canceled by operating a switch with a code number set in the secret code switch, and the device for canceling the alarm by the code method, Only those who have memorized the code number can get on and off the vehicle freely, and once the thief opens the door, an alarm will be issued without fail, making it impossible to stop it. code
Since it is possible to distinguish between those who know the existence of the number and those who do not know whether they are allowed to get on or off the vehicle, it is possible to accurately identify and eliminate those who steal the vehicle.

In addition, since a code system using a secret code switch is adopted, switches for various purposes that are opened and closed in conjunction with the code switch as explained in the embodiments are provided, and the alarm circuit can be operated for purposes other than the thief's ride. Can be done.

Canceling the alarm can be done simply by pressing a switch with the code number set when getting into the vehicle, and the code method that relies on memory does not complicate the device and can be manufactured at low cost.

The present invention also provides for the operation of the secret code switch installed in the vehicle (alarm release) without activating the alarm device and without any trouble by opening the vehicle door below the preset opening angle at which the door switch operates. This further ensures the effect of preventing vehicle theft by a vehicle thief who does not know the opening angle setting.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a vehicle anti-theft device showing an embodiment of the present invention. DS ₁ to DS ₄ ...Door switch, P...Relay for starting the alarm circuit, C...Capacitor shared for starting or canceling the alarm circuit, S...Self-holding for engine ignition circuit cutoff and alarm light lighting circuit relay,
SP...Klaxon, W...Warning light, ES...Engine key switch, Cs...Secret code switch.

Claims (1)

[Claims] 1. In a vehicle anti-theft device in which a door switch is turned on when a door is opened, an alarm circuit is closed, and an alarm is issued, the device is equipped with a secret code switch installed inside the vehicle, and the secret code switch is activated. The alarm circuit is released by operating a switch with a set code number, and the opening angle of the door at which the door switch is turned on is set, and the driver opens the door below the opening angle to release the above-mentioned secret. A vehicle theft prevention device characterized in that a code switch is manually operated from outside the vehicle.