JPH10305789A - Anti-theft device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anti-theft device for a vehicle whereby setting work can be easily performed, also power consumption of a battery can be decreased as small as possible, and a sufficient anti-theft effect is obtained. SOLUTION: This device is constituted such that an anti-theft circuit 1 having a theft preventing key 2, secret switch 4 and a tilt angle sensor 3 detecting a tilt of a car body and an alarm device provided in a car body are equipped, the anti-theft circuit 1, by setting at least the secret switch 4, is placed in an operable condition, in this condition, in the case of outputting a theft signal from the tilt angle sensor 3, an alarm is generated from the alarm device, also an ignition circuit is cut off.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-theft device for vehicles such as motorcycles and automobiles.

[0002]

2. Description of the Related Art As a conventional vehicle anti-theft device, for example, in the case of a two-wheeled vehicle, a steering wheel or a wheel is locked with an iron chain, or a metal wire is used to connect a vehicle body with a utility pole or a vehicle body and a wheel. Mechanical type such as locking,
An electric type which detects vibration and notifies the control box of the owner is used. Also, in the case of four-wheeled vehicles, mechanical types such as putting them in a garage with a key or locking wheels are used, and electric types that sound the horn by sensing vibrations touching the vehicle body and pressure fluctuations in the vehicle interior Things are used.

[0003]

However, in these vehicle anti-theft devices, for example, in the case of a mechanical type of a motorcycle, chains and wires must be set and locked one by one, and the setting work is not performed. In the case of the electric type, the battery is liable to be consumed, the voltage of the battery is reduced, and the antitheft effect is poor.

[0004] Also, in the case of a four-wheeled vehicle, the setting work is very troublesome in the case of the mechanical type, and in the case of the electric type, it is difficult to perform the operation when the main key is turned on or when the engine is turned on. However, there is a problem that it is difficult to obtain a sufficient anti-theft effect, for example, it is not possible to obtain an antitheft effect.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object of the present invention is to make it possible to easily perform a setting operation and to reduce power consumption of a battery as much as possible.
Another object of the present invention is to provide a vehicle anti-theft device capable of obtaining a sufficient anti-theft effect.

[0006]

In order to achieve the above object, the present invention provides an anti-theft circuit having an anti-theft key, a secret switch and a tilt angle sensor for detecting a tilt of a vehicle body, and an alarm provided on the vehicle body. The anti-theft circuit is in an operable state when at least the secret switch is set. In this state, when a theft signal is output from the tilt angle sensor, an alarm is issued from the alarm and an ignition circuit is provided. Is configured to be shut off.

With this configuration, for example, by turning on the secret switch with the electronic key removed, the anti-theft circuit becomes operable.
In this state, when the stolen person attempts to move the vehicle and returns the vehicle to, for example, the upright position, a theft signal is output from the inclination angle sensor. The anti-theft circuit operates by an output signal from the tilt angle sensor, issues an alarm from an alarm device to notify a driver or the like that the vehicle is stolen, and shuts off the ignition circuit to disable the start of the engine. I do.

This stolen state can be released by setting an electronic key owned by the driver, for example, and cannot be released by a third party without an electronic key. Further, even if the anti-theft circuit is in an operable state, the ignition circuit is not shut off unless the anti-theft signal is output from the tilt angle sensor, and the engine can be started. It can easily cope with parking at the time.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2 show a first embodiment of a vehicle anti-theft device according to the present invention. FIG. 1 is a circuit diagram thereof, and FIG. 2 is a perspective view of an attached state of an inclination angle sensor. In FIG. 1, an anti-theft circuit 1 of the anti-theft device
Has an electronic key 2 as an anti-theft key, an inclination angle sensor 3, a secret switch 4, a relay 5, two NPN transistors 6, 7, and the like.

The electronic key 2 has a jack portion 9 having a pair of terminals and an operating portion 10 used when inserting and removing the socket from a socket (not shown) of the vehicle body. It is short-circuited inside the electronic key 2. Therefore, by inserting the electronic key 2 into the socket, a and b on the anti-theft circuit 1 are connected (short-circuited).

The tilt angle sensor 3 is formed of, for example, a mercury switch or the like, and one of its contacts is a secret switch 4.
In addition, it is connected to a plus terminal 12 of a battery (not shown) via a coupler 11 and to the relay 5. The other terminal of the tilt angle sensor 3 is connected to a resistor 13.
Is connected to the base of the transistor 6.

The tilt angle sensor 3 is set so that its contact is turned off at the set position where the contact is inclined and turned on at the erect position, and as shown in FIG. 2, for example, a handle operation portion of a scooter. It is attached to the steering shaft 15 via an attachment ring 16 and is connected to the anti-theft circuit 1 by a cable 17.

As the secret switch 4, an appropriate switch of a snap type or a push button type is used, and the secret switch 4 is installed at a place on the vehicle body which is not easily recognized by a third party. When the secret switch 4 is turned on, the anti-theft circuit 1 is activated.
Becomes operable.

The transistor 6 includes the electronic key 2, a resistor 19 and a capacitor 2 between its base and emitter.
0 is connected in parallel to ground the emitter side,
A diode 21 is connected in the opposite direction between the base of the transistor 6 and the collector of the transistor 7. The collector of the transistor 6 is connected to the coil 2 of the relay 5.
2 is connected to one end. The transistor 6 prevents the antitheft circuit 1 from being operated too sensitively as described later.

The transistor 7 has a resistor 23 base.
The resistor 25 and the capacitor 26 are connected in parallel between the base and the emitter, and the emitter side is grounded. The collector of the transistor 7 has a resistor 2
The resistor 27 is connected to an ignition switch 28 (main switch) via the coupler 11 and to a common terminal 5 a of one contact of the relay 5. The operation of the anti-theft circuit 1 during the short circuit due to the twisting of the ignition switch 28 and the operation of the antitheft circuit 1 during the operation of the engine are inhibited by the transistor 7.

The relay 5 has a pair of contacts 5a to 5c and contacts 5d to 5f. One common terminal 5a is connected to the ignition switch 28 via the coupler 11 as described above, and the other common terminal 5d. Is connected to the secret switch 4. One normally closed contact 5b is connected to an ignition terminal 29 connected to an ignition circuit, and the other normally open contact 5f is connected to a drive board 30.

An appropriate circuit including a timer (not shown) for operating an alarm device such as a horn provided on the vehicle body for a predetermined time is mounted on the drive board 30. For example, power is supplied. In such a case, a horn driving circuit (not shown) operates so that the horn sounds. A diode 31 is connected between both ends of the coil 22 of the relay 5, and an AC generator 32 is connected to the positive terminal 12 via a charging rectifier diode 33.

Next, an example of the operation of the anti-theft circuit 1 will be described. First, when the engine is operated (the ignition switch 28 is on and the secret switch 4 is on) and the electronic key 2 is removed, if the inclination angle sensor 3 is not operated, the relay 5 will not operate and the connection will be made. Power is supplied from the plus terminal 12 to the ignition terminal 29, that is, the ignition circuit via the contact points 5a and 5b, so that the engine is kept operating.

On the other hand, when the tilt angle sensor 3 operates in the above state, a voltage is supplied to the base of the transistor 6 and the transistor 6 is turned on. Therefore, the relay is turned on through the ignition switch 28 and the secret switch 4 which are turned on. Current is supplied to the coil 22 of No. 5, and the relay 5 operates and turns on. When the relay 5 is turned on, the contacts 5a, 5a
b open, the plus terminal 12 and the ignition terminal 29
Is discontinuous, that is, the ignition circuit is shut off and the engine is stopped, the circuit to the drive board 30 is connected, power is supplied to the drive board 30, the horn sounds for a predetermined time, and an alarm is issued.

The transistor 6 is set by a circuit of the resistor 13 and the capacitor 20 so as to be turned on only after the tilt angle sensor 3 has been operated to some extent (to the extent that it cannot be operated by vibration or wind). The anti-theft circuit 1 is activated by a slight vibration of the vehicle body, and the horn does not sound. That is, an excessive reaction of the anti-theft circuit 1 is prevented.

Next, the operation when the engine is stopped (the ignition switch 28 is turned off), the secret switch 4 is turned on, and the anti-theft circuit 1 in which the electronic key 2 is pulled out is set will be described. First, when the seatlet switch 4 is turned on, power is supplied from the plus terminal 12 to the anti-theft circuit 1 to be in an operable state.

When the tilt angle sensor 3 operates in this state,
The transistor 6 turns on, the relay 5 operates and turns on,
Power is supplied to the drive board 30 and the horn sounds as described above, and the ignition circuit is shut off, so that the engine cannot be started.

The stolen state is released by inserting the electronic key 2 into the socket of the vehicle body and short-circuiting the points a and b of the anti-theft circuit. That is, by setting the electronic key 2, the transistor 6 is turned off and the relay 5 is turned off.
Is turned off, the power supply to the drive substrate 30 is cut off, and the horn stops sounding.

On the other hand, if the ignition switch 28 is twisted and short-circuited (turned on) in the set state of the anti-theft circuit 1, for example, the resistor 27 connected to the collector of the transistor 7 and the diode 21 A voltage is supplied to the base, the transistor 6 is turned on, the relay 5 is operated and turned on, and the horn is sounded as in the case where the tilt angle sensor 3 is operated, and the ignition circuit is cut off, so that the engine cannot be started. become.

As described above, according to the anti-theft circuit 1 of the above embodiment, only by turning on the secret switch 4,
The antitheft circuit 1 can be set to a set state, and the electronic key 2 can be inserted to release the theft state, so that the antitheft device itself can be set and reset easily.

Further, since the horn sounds only by returning the parked vehicle to the upright position, it is difficult to push the vehicle away or carry it on a truck, and it is difficult to remove the vehicle. However, if the user tries to drive and remove the vehicle, the horn will stop the engine and it will be difficult to remove the vehicle.

Further, even if the insertion portion of the electronic key 3 is broken or the ignition switch 28 is twisted, the provision of the transistors 6 and 7 in the anti-theft circuit 1 has no effect on the anti-theft. There is no influence, and since the anti-theft circuit 1 is constituted by electronic components such as the transistors 6 and 7, it is possible to restore the once activated anti-theft circuit 1 unless it has electrical knowledge. Can not. From these facts, according to the anti-theft circuit 1, it is possible to obtain a sufficient anti-theft effect which cannot be obtained in the conventional example.

Further, since the anti-theft circuit 1 is provided with the transistor 6, the resistor 13, the capacitor 19, and the like, the anti-theft circuit 1 does not operate excessively due to vibration, wind, and the like. By providing a time constant circuit, the alarm that once sounded can be automatically stopped after a predetermined time (sufficient time to notify the theft) (however, the engine cannot be started), preventing the neighborhood from being annoying. Can be obtained.

FIG. 3 is a circuit diagram showing a second embodiment of the anti-theft device according to the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. The anti-theft circuit 41 of the second embodiment includes one NP
An N-type transistor 42 is provided.
Is grounded via a resistor 43 and a capacitor 44, and can be grounded via an electronic key 2.

The transistor 42 has an emitter grounded and a collector connected to the coil 22 of the relay 5.
The tilt angle sensor 3 is connected to the base via a resistor 45. Resistance 45 of tilt angle sensor 3
Is connected to one common terminal 5a of the relay 5 via a diode 46 connected in the reverse direction and to the ignition switch 28 via a coupler 47.

The secret switch 4 has one end connected to the positive terminal 12 of the battery via the coupler 48, and the other end connected to the other end of the coil 22 of the relay 5 and the common terminal 5d of the other contact. I have. The relay 5 has a normally closed contact 5b of one contact connected to an ignition terminal 29 via a coupler 48, and a normally open contact 5f of the other contact connected to a drive board 49. The drive board 49 is configured to issue an alarm when power is supplied to the drive board 30, contrary to the drive board 30.

The anti-theft circuit 41 is operable by removing the electronic key 2 and turning on the secret switch 4. When the tilt angle sensor 3 operates in this state, the transistor 42 turns on and the relay 5 operates. Then, the contacts 5a and 5b are opened to shut off the ignition circuit, and power is supplied to the drive board 49 to sound the horn. This stolen state is released by setting the electronic key 2 and turning off the transistor 42.

When the engine is operated (ignition switch 28 and secret switch 4 are both turned on), the inclination angle sensor 3 is operated to stop the engine and sound the horn. Therefore, theft when leaving the vehicle body with the engine running can be prevented.

In the second embodiment, the same operation and effect as those of the first embodiment can be obtained.
1 has no current flowing in the set state, the power consumption can be reduced to zero, and the operation and effect of being able to more reliably prevent the battery from running down can be obtained.

FIG. 4 is a circuit diagram showing a third embodiment of the anti-theft device according to the present invention. In the anti-theft circuit 51 of the third embodiment, a fuse 52 and a secret switch 4 are connected in series to a positive terminal 12 of a battery. The secret switch 4 has a safety circuit 55 having an electronic key 53 and a voltage comparator 54 and the like, a theft detection circuit 56 having an inclination sensor 3 and the like, and a control having two comparators 57 and 58 and a relay 68 and the like. A circuit 59 is connected.

The electronic key 53 has a resistor 53a having a predetermined resistance value loaded therein, and is inserted into a socket of the vehicle body so that terminals c and
The resistor 53a is connected between d. Note that protection resistors 61 and 62 are connected to both sides of the electronic key 53.

The voltage comparator 54 includes three resistors 62
The two reference voltages Va, Vb generated by.
And a set voltage V generated by setting the electronic key 53
And two comparators 57, 58 of the control circuit 59.
Output to one of the input terminals. The theft detection circuit 56 generates a predetermined voltage by the resistors 65 and 66 when the tilt angle sensor 3 is turned on, and the comparators 58 and 59 of the control circuit 59.
Output to the other input terminal. Note that a capacitor 67 is connected to the resistor 66 in parallel.

One comparator 57 of the control circuit 59 compares the output voltage Ve of the theft detection circuit 56 with the output voltage V2 of the voltage comparator 54, and outputs a relay drive signal to the relay 68. At this time, the comparator 57 determines the combination of the input voltage Ve and the voltage V2,
Of the electronic key 53 and the tilt angle sensor 3 among the combinations of the states of the electronic key 53 and the tilt angle sensor 3 when the electronic key 53 is not present and the tilt angle sensor 3 is on, the electronic key 53 is short-circuited and the tilt angle sensor 3 is turned on The relay drive signal is output only in the case of.

Further, the comparator 58 calculates the voltage Ve and the voltage V2
And outputs an LED display signal for displaying the driving state of the relay 68 on the LED 69 to which the resistor 70 is connected in series. The relay 68 of the control circuit 59 has a horn drive circuit 71 connected to a horn 72 of the vehicle body and a kill switch drive circuit 73 connected to a kill switch 74 of the vehicle body.
Is connected.

When the secret switch 4 is turned on, the anti-theft circuit 51 of the third embodiment becomes operable. If a third person attempts to move the vehicle with the electronic key 53 removed, the vehicle is tilted. The angle sensor 3 is turned on, and the theft signal is output from the comparator 58 to the relay 68. The relay 68 causes the horn 72 to sound through the horn drive circuit 71 in response to this signal, and shuts off the kill switch 74 via the kill switch drive circuit 73.

If the ignition key is forgotten and the anti-theft circuit 51 is set, and the user attempts to steal the ignition key, the anti-theft circuit 51 turns the starter motor but cannot start the engine. If the ignition key is forgotten and the steering wheel is in the set position of the anti-theft circuit 51, the engine can be started, but the horn 72 will be turned off as soon as the steering wheel is returned to the upright position (straight direction). The sound engine stops. However, in this case, the horn 72 stops sounding after a certain time, and when the horn 72 sounds by moving the steering wheel, the horn 72 is returned by returning the steering wheel to the original state.
Will stop ringing.

In the anti-theft circuit 51 of the third embodiment, substantially the same operation and effect as those of the first embodiment can be obtained. In addition, since the resistor 53a is mounted inside the electronic key 53, the resistance 53a Can be easily set for each vehicle body, and in combination with the anti-theft circuit 51, a very large number (for example, thousands) of electronic keys 53 can be set, and the anti-theft effect can be improved. Can be further enhanced. As a result, it is particularly suitable to be attached to an expensive large vehicle.

By the way, in the above embodiment, the case where the inclination angle sensor 3 of each anti-theft circuit is attached to the steering shaft 15 of the small motorcycle is described.
For example, in the case of a large motorcycle, the vehicle may be tilted using a side stand (not shown) and attached to an appropriate position of the vehicle body where the inclination angle sensor 3 is turned off, thereby setting the set position.

Thus, when the motorcycle parked in the upright position using the side stand is to be stolen, the vehicle body must be returned to the upright position without fail. Is detected by the inclination angle sensor 3 to detect the theft state, and the anti-theft circuit 1 provides the same anti-theft effect as that of the small motorcycle.

In the case of a four-wheeled vehicle, for example, the tilt angle sensor 3 is mounted on a side brake lever (not shown), and the state in which the side brake lever is pulled is the set position.
As a result, when leaving the vehicle, the side brake lever is always pulled, so if the side brake lever is removed from the set position to return to the upright position in an attempt to run the vehicle at the time of theft, the inclination angle sensor 3 is activated and the stolen state is established. Will be detected.

As described above, the tilt angle sensor 3 is attached to an appropriate position of the vehicle body where the tilt position changes between when the vehicle is running and when the vehicle is parked and cannot be easily destroyed from the outside. Also, the electronic keys 2, 53 and the secret switch 4 are not easily visible from the outside and cannot be destroyed, and are mounted at appropriate places on the vehicle body where insertion and removal are easy. Is done.

In the above embodiment, the jack 9
Of the electronic key 2 whose terminals are short-circuited,
Although the electronic key 53 loaded with is used, for example, a magnet key may be used in place of the electronic keys 2 and 53, and an appropriate key that can partially turn on / off the circuit of the anti-theft circuit may be used. It is needless to say that various modifications can be made without departing from the gist of the present invention, for example, by using.

[0048]

As described above in detail, according to the vehicle anti-theft device of the present invention, the setting and resetting can be performed by turning on / off the secret switch and inserting / removing the anti-theft key. And the power consumption of the battery in the set state can be extremely reduced. Further, by using an anti-theft key, a secret switch, an inclination sensor for detecting the inclination of the vehicle body, and the like in the anti-theft circuit, the anti-theft effect can be sufficiently enhanced.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a first embodiment of a vehicle anti-theft device according to the present invention;

FIG. 2 is an essential part perspective view showing an example of a mounting position of the inclination angle sensor.

FIG. 3 is a circuit diagram showing a second embodiment of the vehicle anti-theft device according to the present invention;

FIG. 4 is a circuit diagram showing a third embodiment of the vehicle anti-theft device according to the present invention;

[Explanation of symbols]

 1, 41, 51: anti-theft circuit 2, 53: electronic key 3: tilt angle sensor 4: secret switch 5: ·········· Relays 6, 7, 42 ················································· Ignition switch 29 ············ Ignition Terminals 30, 48, drive board 54, voltage comparator 55, safety circuit 56, theft detection circuit 59, Control circuit 71 Horn driving circuit 72 Horn 73 Kill switch driving circuit 74・ Kill switch

Claims (1)

[Claims] An anti-theft circuit having an anti-theft key, a secret switch, and an inclination sensor for detecting an inclination of the vehicle body, and an alarm provided on the vehicle body, wherein the anti-theft circuit has at least a secret switch set. The vehicle is configured to be in an operable state by performing the operation, and when the theft angle sensor outputs a theft signal in this state, an alarm is issued from the alarm device and the ignition circuit is shut off. Anti-theft device.