JP2792937B2 - Vehicle burglar alarm - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vehicle burglar alarm device that issues an alarm when any of the lead wires constituting a control circuit of a vehicle is disconnected.

(Prior Art) The above device is provided with a detector that detects an act of stealing a parked vehicle electrically or electronically, and operates a burglar alarm by a detection signal of this detector. A device that issues an alarm has been proposed.

(Problems to be Solved by the Invention) By the way, according to the above-described conventional configuration, when the vehicle is about to be stolen, and the lead wire that constitutes the control circuit of the vehicle is cut, the detector detects the detection signal. May not be output, or the detection signal from this detector may not be input to the theft alarm. In other words, in this case, there is a possibility that a reliable alarm cannot be obtained.

(Object of the Invention) The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide an alarm when a part of a control circuit of a vehicle is cut off at the time of theft. Aim.

(Structure of the Invention) A feature of the present invention for achieving the above object is to provide a first switch for connecting a circuit interposed between a generator and an ignition coil of an engine to ground,
In a vehicle control circuit having a second switch for connecting a battery to a load such as a lamp, wherein the two switches are operated to open and close in opposite directions, a battery is connected to a generator-side contact of the first switch. An alarm signal output unit that outputs a signal to the alarm unit when only one of the generator-side contact of the first switch and the load-side contact of the second switch exceeds a predetermined voltage is provided.

(Operation) The operation of the above configuration is as follows.

When the vehicle is parked, the circuit interposed between the flywheel magneto (generator) 3 and the ignition coil 8 of the engine is normally connected to the ground 20 by the first switch 21 in the closed state, Has been stopped. Therefore, even when the battery 25 is connected to the generator-side contact 36 of the first switch 21, the voltage of the generator-side contact 36 is grounded through the first switch 21. Therefore, the generator-side contact 36 is kept at a predetermined voltage or lower.

Further, since the first switch 21 is closed as described above, the second switch 27 provided between the battery 25 and the load 26 is open. For this reason, no voltage is input to the load-side contact 38 of the second switch 27, and this is also kept below a predetermined voltage.

That is, when the vehicle is parked as described above,
A generator-side contact 36 of the first switch 21 and a second switch
Since all of the load-side contacts 38 of the 27 are lower than the predetermined voltage, no alarm signal is output from the alarm signal output means 40 connected thereto, that is, no alarm is issued in a normal parking state. .

In the above state, the lead wires 23 and 28 are disconnected, the voltage input from the battery 25 to the generator-side contact 36 of the first switch 21 exceeds a predetermined voltage, and the voltage between the generator-side contact 36 and the load-side contact 38 is increased. If only one of them exceeds the predetermined voltage, the alarm signal output means 40 outputs an alarm signal and an alarm is issued.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

 FIG. 1 shows a first embodiment of the present invention.

In the figure, 1 is a control circuit of a vehicle such as a motorcycle,
2 is an engine ignition circuit.

The ignition circuit 2 has a flywheel magneto 3 serving as an AC generator. The flywheel magneto 3 is adapted to be linked to the crankshaft of the engine. It has.

On the other hand, reference numeral 8 denotes an ignition coil, which has a primary winding 9 and a secondary winding 10, and an ignition plug
11 is connected, and this spark plug 11 faces the combustion chamber of the engine. The ignition coil 8 is connected to the flywheel magneto 3 by an ignition control unit 13.

The ignition control unit 13 has a capacitor 14 and a thyristor 15 connected in series to the primary winding 9, the charge coil 5 is connected to the capacitor 14 via a diode 17, and the pulsar coil 6 Diode 18
Through the gate of the thyristor 15.

The operation of the flywheel magneto 3 linked to the engine causes the charge coil 5 to output and charge the capacitor 14. At the same time, the thyristor 15 is turned on by the output of the pulser coil 6, thereby discharging the electric charge stored in the capacitor 14 and discharging the primary winding 9.
Current is passed through the Then, a high voltage is induced in the secondary winding 10 by the current inducing action. Then, the spark plug 11 causes a spark discharge by the high voltage, and the combustion in the combustion chamber is appropriately performed.

A first switch 21 for connecting the primary side of the capacitor 14 to the ground 20 is provided, and a diode 22 is interposed between the capacitor 14 and the first switch 21. These components are respectively connected by lead wires 23. Have been. 24 is a coupler.

When the engine is operated, the first switch 21 is changed from the closed state shown by the solid line in the figure to the open state shown by the virtual line in the figure. Then, the output of the charge coil 5 is charged to the capacitor 14 without being grounded to the ground 20, and the predetermined ignition operation by the spark plug 11 is obtained as described above.

On the other hand, when trying to stop the engine, the first switch 21 is closed as shown by the solid line in the figure. Then
The output of the charge coil 5 passes through the diode 22 and the ground 20
And the engine stops operating. When the vehicle is parked, usually, the first switch
21 is held closed and the engine is stopped.

On the other hand, a second switch 27 for connecting the battery 25 to a load 26 such as a flasher or an oil-marked lamp is provided, and these components are connected by lead wires 28, respectively. 29 is a coupler.

The second switch 27 constitutes a main switch 30 together with the first switch 21, and these are interlocked with each other so as to perform opening and closing reverse operations. When the first switch 21 is closed and the second switch 27 is open as shown by the solid line in the figure, the main switch 30 is in the OFF state. On the other hand, as shown by the virtual line in the figure, the first switch 21 is closed. Is open, while the second switch 27 is closed, the main switch 30 is ON.

In the above configuration, the theft alarm device 32 is provided. Hereinafter, the burglar alarm device 32 will be described.

A generator-side contact 36 of the first switch 21 is connected to the battery 25 via a constant voltage circuit 33, a resistor 34, and a diode 35 sequentially. An alarm signal output means 40 for outputting a signal when only one of the generator-side contact 36 of the first switch 21 and the load-side contact 38 of the second switch 27 exceeds a predetermined voltage is provided. Have been.

The alarm signal output means 40 has a constant voltage circuit 41 connected to the load side contact 38 of the second switch 27. The output side of the constant voltage circuit 41 is connected to the earth 43 via the resistor 42. Further, an EX-OR circuit 45 for connecting the output sides of the constant voltage circuits 33 and 41 in parallel is provided. Furthermore, this EX
The flip-flop 46 and the transistor switch 47 are connected in series to the -OR circuit 45. The second switch 27 is connected to the collector of the transistor switch 47.
And a buzzer 48 serving as alarm means are connected in series.
The emitter of the transistor switch 47 is grounded.
Connected to 49.

In the above configuration, the buzzer for each mode at the time of parking, operation of the engine, and at the time of theft is provided.
The table below shows the relationship between the 48 sounds (ON).

However, in the above table, “0” in the input section of the EX-OR circuit 45 indicates that there is no voltage at the generator-side contact 36 and the load-side contact 38,
That is, if these voltages are equal to or lower than the predetermined voltage and EX-
This indicates that there is no input to the OR circuit 45. On the other hand, "1"
Indicates that the EX-OR circuit 45 has an input exceeding the predetermined voltage. In the output section of the EX-OR circuit 45, "0"
Indicates that there is no output of the detection signal, and "1" indicates that it is an output. The voltage of the battery 25 is 12 V or 6 V, and the output side of each of the constant voltage circuits 33 and 41 is 5 V.

According to the mode No. 1 in the above table, as shown by the solid line in FIG. 1, the main switch 30 is OFF, the engine is not operating such as during parking, and the first switch 21 is closed. , The second switch 27 is open. Then, at this time, a constant voltage circuit 33 and a resistor 34
The voltage to be input to the EX-OR circuit 45 is grounded to the ground 20 via the first switch 21, that is, this voltage is
It is not input to the EX-OR circuit 45. Further, since the second switch 27 is open, the voltage from the battery 25 is not input to the EX-OR circuit 45 through the second switch 27. For this reason, the inputs to the EX-OR circuit 45 from the generator-side contact 36 and the load-side contact 38 are both "0", and the output of the EX-OR circuit 45 is also "0". 48 does not sound.

According to the mode No. 2 in the table, the main switch 30 is on and the engine is running, as indicated by the phantom line in FIG. 1, and the first switch 21 is open,
On the other hand, the second switch 27 is closed. Then, at this time, EX is supplied from the battery 25 via the constant voltage circuit 33 and the resistor 34.
A voltage is input to the -OR circuit 45, and a voltage is input from the battery 25 to the EX-OR circuit 45 via the second switch 27 and the constant voltage circuit 41. Therefore, both the generator-side contact 36 and the load-side contact 38 exceed the predetermined voltage, and the inputs to the EX-OR circuit 45 from these sides both become “1”. As a result, the output of the EX-OR circuit 45 becomes “0”,
Also in this case, the buzzer 48 does not sound.

Further, the mode of No. 3 in the above table shows a case where the lead wire 23 is cut off, such as in the case of theft, in the mode of No. 1 described above. That is, in this case, the state is the same as when the first switch 21 is opened, and the constant voltage circuit 33 and the resistor
A voltage higher than a predetermined voltage is input to the EX-OR circuit 45 via 34.

On the other hand, since the second switch 27 remains open, the voltage of the battery 25 is not input to the EX-OR circuit 45 via the second switch 27. That is, the generator side contact 36
Only one of the inputs from the load-side contact 38 to the EX-OR circuit 45 is "1", and the output of the EX-OR circuit 45 is "1". As a result, the buzzer 48 sounds and the alarm Is issued.

The mode of No. 4 in the above table is a case where each of the lead wires 23 and 28 is entirely cut. Also, the mode of No. 5 shows more specifically the case where each of the lead wires 23 and 28 is completely cut off, and shows the case where each of the couplers 24 and 29 is completely disconnected. EX-OR in any mode
This shows a case where only one of the inputs of the circuit 45 becomes “1”. Then, the result is the same as that of the mode of No. 3.

In addition, in the above case, once the buzzer 48 sounds, the buzzer 48 is reconnected even if the disconnected lead wires 23, 28 (disconnected couplers 24, 29) are connected again unless the battery 25 is removed. Will continue to be.

Although the above description is based on the illustrated example, the existing buzzer 48 may be used for the vehicle, or may be separately provided. Further, an alarm lamp may be used instead of or in addition to the buzzer 48.

 FIG. 2 shows another embodiment.

According to this, the flip-flop in the above embodiment is
A monostable multivibrator 51 is provided instead of 46,
As a result, the buzzer 48 can be used only for a desired time, such as 5 minutes.
Is made to sound.

 Other configurations and operations are the same as those of the above embodiment.

 FIG. 3 shows still another embodiment.

According to this, the transistor switch of each of the above embodiments is provided.
The following configuration is used in place of 47.

That is, the thyristor 53 and the earth 54 are connected in series to the generator-side contact 36 of the first switch 21, and the thyristor 53
Is connected to the output side of the EX-OR circuit 45. On the other hand, a solenoid relay 55 is provided, and its coil 56
The switch 57 is connected between the buzzer 48 and the earth 49 while being connected to the output side of the OR circuit 45.

For this reason, in the state of the above-mentioned No. 1 mode, No. 3 to No. 5
When a signal is output from the EX-OR circuit 45 as in
When the switch 57 is closed by the action of the coil 56, the buzzer
When 48 blows, the charge coil 5 becomes thyristor 53
To ground 54, and the engine is rendered inoperable.

 Other configurations and operations are the same as those of the above embodiments.

(Effects of the Invention) According to the present invention, a battery is connected to the generator-side contact of the first switch,
An alarm signal output means for outputting a signal to the alarm means when only one of the load-side contacts of the second switch and the load-side contact exceeds a predetermined voltage is provided, so that the lead wire is disconnected while the vehicle is parked. The voltage input from the battery to the generator-side contact of the first switch exceeds a predetermined voltage,
If only one of the generator-side contact and the load-side contact exceeds a predetermined voltage, the alarm signal output means outputs an alarm signal and an alarm is issued.

That is, at the time of theft, when a part of the control circuit of the vehicle is cut off, an alarm is immediately issued,
Therefore, theft is reliably prevented.

[Brief description of the drawings]

FIG. 1 is an overall circuit diagram showing a first embodiment of the present invention, FIG. 2 is a diagram corresponding to a part of FIG. 1 showing another embodiment, and FIG. 3 is an overall circuit diagram showing still another embodiment. It is. DESCRIPTION OF SYMBOLS 1 ... Control circuit, 2 ... Ignition circuit, 3 ... Flywheel magneto (generator), 8 ... Ignition coil, 20 ... Earth, 21 ... First switch, 25 ... Battery, 26 ... Load , 27 ... second switch, 32 ... burglar alarm device, 36 ...
Generator-side contact, 38 ... Load-side contact, 40 ... Alarm signal output means, 48 ... Buzzer (alarm means).

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-30452 (JP, A) JP-A-59-8543 (JP, A) JP-A-55-68444 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) B60R 25/10 B60R 25/04 F02D 45/00 G08B 15/00 G08B 21/00

Claims (1)

(57) [Claims] A first switch for connecting a circuit interposed between a generator and an ignition coil of an engine to a ground is provided, while a second switch for connecting a battery to a load such as a lamp is provided. In a control circuit for a vehicle configured to perform opening / closing reverse operation, a battery is connected to the generator-side contact of the first switch, and the generator-side contact of the first switch and the load-side contact of the second switch are connected. A vehicle burglar alarm device provided with alarm signal output means for outputting a signal to an alarm means when only one of them exceeds a predetermined voltage.