JPH0659814B2 - Car anti-theft device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an antitheft device for an automobile, and in particular, does not require a special sensor or switch, and can operate a special switch for setting an alarm. The invention relates to an anti-theft device that is not needed.

[Prior Art] Conventionally, when a driver sets an alarm circuit when leaving a vehicle and then sets it, when the door of the vehicle is opened or when it is detected that there is a moving object in the vehicle, Various anti-theft devices have been developed that make an existing horn (horn) ring in an automobile.

[Problems to be Solved by the Invention] However, in all of the conventional ones, it is necessary to separately install a special and expensive sensor such as an infrared sensor or a radar detector utilizing the Doppler effect, or In some cases, a hidden switch must be provided in the passenger compartment to set or reset the alarm circuit, or a separate remote control device must be prepared, which ultimately leads to high costs and requires the driver to perform a troublesome operation. Many were great obstacles to the spread.

In view of this point, the present invention does not require the installation of special operation parts in the vehicle interior, and in particular, devices that are normally provided in a normal automobile even when the driver sets or resets the alarm circuit. The purpose of the present invention is to provide a simple and reliable anti-theft device for an automobile, which does not require any special parts to be used.

[Means for Solving the Problems] In order to achieve the above object, the present invention firstly turns on / off a so-called key switch for controlling the operation and stop of an internal combustion engine of an automobile, and turns on / off a room lamp, for example. Focusing on the state of the door switches used for turning off and door opening warnings, the user (driver) should operate these switches in a predetermined order.

In other words, in order to satisfy this, when the door of the car is opened with the key switch of the car turned on and the door switch is turned on, the first time measurement is started. When the key switch is opened by the time it is completed, the second time measurement starts from that point,
A timer circuit was prepared in which the key switch was not opened within the first time and the initial state was returned when the measurement of the first time was completed.

Further, the timer circuit enters the alarm activation standby state when the measurement of the second time described above is completed, and from the time when the door switch is detected to be ON under the alarm activation standby state until the alarm activation. Start measuring the third time, which is the grace period. Then, if the key switch is turned on within the third time, which is the grace period until the alarm is activated, the measurement of the third time is interrupted, and the initial time is still the same as when the measurement of the first time was completed. I tried to return to the state.

On the other hand, as a control circuit that operates according to the time measurement state of the timer circuit, when the key switch is opened while the timer circuit is measuring the first time, the set state is set, and Then, when the timer circuit completes the measurement of the third time, the horn switch mounted on the vehicle is short-circuited to set the horn to ring.
A reset circuit is provided. Therefore, the horn usually provided in the automobile is also used as the theft alarm means in this device.

The present invention also discloses a simple means for disabling the alarm means, the horn beeps, the authorized owner of the vehicle, who is aware of this, inserts the key and turns on the key switch to set / reset as described above. The circuit is made to break the horn switch short circuit.

Further, as described above, the horn is the most effective means for theft alarm, but it is more convenient to turn on the small lamp before the horn rings. For example,
With the above configuration, after the timer circuit measures the second time, the timer circuit starts measuring the third time even when the regular driver opens the door. If the legitimate owner does not insert the key switch before the measurement is completed, the horn will ring and a flashy warning will be issued.

Therefore, when the small lamp of the vehicle lights up as a preliminary or primary warning before the horn rings, it is kind to the legitimate owner.

Therefore, in the present invention, in addition to the above configuration, the timer circuit starts measuring the fourth time shorter than the third time at the same time as the start of the third time measurement described above, while the set / reset circuit, There is also disclosed a configuration in which the small lamp switch mounted on the vehicle is short-circuited when the timer circuit completes the measurement of the fourth time period before the completion of the measurement of the third time period.

[Operation] The anti-theft device of the present invention is based on a predetermined combination of opening and closing of the door of the automobile and ON / OFF of the key switch without the need to operate special switches provided separately, and Acts like.

If the driver of the vehicle wishes to set and place the alarm device before leaving the vehicle, he first opens the vehicle door before turning off the key switch to stop the engine.

Then, the timer circuit starts measuring the first time, for example, 5 seconds. If this is not the case, i.e. when the door is opened after turning off the key switch of the car, the device will not work. Of course this is important. It is rather inconvenient for this kind of device to work without fail.
According to the intention of the user, they should be able to work only when needed.

Also, as a result of the door being opened, the timer circuit started measuring the above first time, but when the key switch was not opened and the measurement of the first time was completed, the timer circuit also started. Will return to the initial state. This assumes, for example, that the door has been opened, but the engine will not be stopped.In such a case, the driver of the car generally does not leave the car for a long time, and it is recommended to restart. This is because it seems normal and it is considered unnecessary to set this alarm device.

On the other hand, when the driver wants to set the device, the key switch is turned off by the time the timer circuit finishes measuring the first time (for example, about 5 seconds as described above). Just do it.

By doing so, the set / reset circuit in the alarm device substantially enters the set state, and from this state, the grace time until the driver gets out of the automobile and occupies the door is gained. After is turned off, the timer circuit starts measuring the second time (for example, about 30 seconds).

When the timer circuit completes the measurement of this second time, the device is essentially put into a standby state in which an alarm can be activated based on the subsequent door opening. That is, the timer circuit starts measuring the third time from the time when it is detected that the door switch is on after the completion of the measurement of the second time.

This third time is a grace period until the alarm is activated, and is set in order to gain time to reset the alarm device if the person who opened the door is a legitimate vehicle owner. For example, this can be selected in about 15 seconds. That is, if the key switch is turned on within the third time after opening the door, the timer circuit interrupts the measurement of the third time and returns to the initial state.

However, if the person who opened the door had malicious intent, of course, since he does not have a legitimate key, the key switch will not be closed, and the timer circuit will eventually reach the third time. Finish measuring.

Then, the set / reset circuit activates the alarm, short-circuits the horn switch mounted on the vehicle, and sounds the horn, thereby confirming that the vehicle has some abnormality such as theft. Give an alarm.

Resetting when such an alarm is issued is done by the authorized holder inserting the key and turning on the key switch. This method is the simplest and is also excellent in that it does not require a dedicated operating device separately. In particular, as described above, after performing the predetermined operation of turning off the key switch within the first time after opening the driver's door, the second step is to get out of the driver's seat and exit the door. Even if the regular driver does not close the door within the second time that can be set to about 30 seconds, for example, as a grace period before the operation of closing the As the detection of the door open state under the alarm activation standby state, the measurement of the third time starts immediately after the measurement of the second time, so conversely, it is extremely easy to reset. It is desirable.

Further, according to still another aspect of the present invention, before the horn suddenly sounds, a small lamp as a device installed in a normal automobile is also used as a preliminary or primary warning means. , It can be turned on.

That is, according to the another aspect of the present invention, the timer circuit can measure the fourth time shorter than the third time at the same time when the measurement of the third time is started, and the fourth time elapses. After that, first, the set / reset circuit short-circuits the small lamp switch. Therefore, for example, if the third time is set to about 15 seconds as described above, set about 5 seconds as the fourth shorter time. For example, if the key switch is not turned on for about 5 seconds after the door is opened, the small lamp will light up first, and the key switch will still not turn on for about 10 seconds (the third time -Fourth time), the horn will sound as a full-fledged alarm for the first time there.

[Embodiment] The accompanying drawings show a circuit configuration of an embodiment of an anti-theft device for a vehicle constructed according to the present invention.

The battery 31 is usually a DC power source mounted on an automobile, and the key switch 32 is used for operating and stopping the engine and turning on and off various electric components as usual. Therefore, its output line (battery power supply line) is simply indicated by an arrow except for the line related to the alarm circuit 10 of the present antitheft device.

Similarly, this is also one of the basic electrical components normally installed in a vehicle, such as selectively lighting the room lamp 34 (only one is shown) or opening a door (not shown). There are also shown four door switches 33 which are used to warn the driver that the door is open and which is turned on / off (that is, the opening / closing is detected) in conjunction with opening / closing of the door. There are four, because a so-called four-door vehicle is assumed, and the number of door switches 33 changes in parallel with each other depending on the number of doors. vice versa,
In some special commercial vehicles, only the door switch on the driver's side is independent from other switch systems. In such a case, this device may be assembled by paying attention to only the door switch on the driver's side, and by using an appropriate buffer circuit (not shown), any door can be used in such a case. The timer circuit 12, which will be described later, can be operated even when is opened.

As other existing devices or existing parts reasonably diverted in the anti-theft device of this embodiment, this is also a horn (horn) 36 and a small part which are usually adopted in any automobile as basic electric components.・ Lamp 38 (only two,
There is a parallel relationship).

Of course, the horn 36 naturally sounds when the serial horn switch 35 is closed by the driver's operation of the horn button and is connected to both ends of the battery 31, and the small lamp 38 also operates. If the small lamp lighting position is selected by the operator's operation of the lamp switch 37 (shown as a single circuit open / close switch), the battery
It comes on at both ends and lights up.

Hereinafter, the operation of the alarm circuit 10 relating to the present antitheft device using such existing parts will be described over time.

If the driver of the vehicle wants to set and place the alarm device before leaving the vehicle, first open the vehicle door before turning off the key switch 32 to stop the engine. .

Then, since at least one of the door switches 33 is turned on, the contact potential connected to the battery hot side end of the group of door switches 33 drops to almost the ground potential,
Therefore, the timer circuit 12 connected to the input end of the door opening / closing signal can know that the door is opened, and from this point of time, the measurement of the first time, for example, 5 seconds is started.

However, reversing the above order, the key switch of the car
This device will not work if the door is opened after turning off 32. When the key switch 32 is turned off first, the set / reset circuit 11 in the alarm circuit 10 cannot receive the power from the battery 31 through another power supply path after the key switch 32 is turned off. And therefore the timer circuit
12 does not work either.

This is important, as I mentioned earlier. It is rather inconvenient that the alarm circuit 10 always works. According to the intention of the user, they should be able to work only when needed.

Further, as a result of the door being opened, the timer circuit 12 started measuring the above-mentioned first time (here, about 5 seconds), but the key switch 32 was not opened, and the first time (5 seconds) Even when the measurement is completed, the timer circuit 12 returns to the initial state. This assumes, for example, that the door has been opened, but the engine will not be stopped.In such a case, the driver of the car generally does not leave the car for a long time, and This is because it seems normal to start operation again.

On the other hand, if the driver desires to set the device, the key switch 32 may be turned off by the time the timer circuit 12 finishes measuring about 5 seconds as the first time.

In this way, the set / reset circuit 11 in the alarm device substantially enters the set state. In this embodiment, the timer circuit 12 sends, for example, about 5 seconds in order to notify the driver that the set state has been entered. Predetermined time, auxiliary alarm 13
Sounds. Since this auxiliary alarm 13 does not give a theft alarm, a small sound may be emitted, and a small piezoelectric vibrating element or any other known existing sound generator may be used.

When entering such a set state, the timer circuit 12 turns off the second time (for example, 30 seconds) after the key switch 32 is turned off in order to gain a grace period for the driver to get out of the vehicle and occupy the door. Start measurement.

When the timer circuit 12 completes the measurement of the second time of 30 seconds, the device practically enters a standby state in which an alarm can be activated based on the subsequent opening of the door. That is, the timer circuit 12 starts measuring the third time (for example, 15 seconds) from the time when it is detected that the door switch 33 is ON after the completion of the measurement of the second time. This third time is when the person who opened the door is a legitimate vehicle owner,
It is set to give the alarm device time to reset.

Therefore, within this third time period after opening the door (since door switch 33 is on), key switch 32
When is turned on, the timer circuit 12 interrupts the measurement of the third time and returns to the initial state. Also, in order to encourage the regular driver to insert the key after opening the door, the auxiliary alarm used when the device was set for a predetermined time, for example, about 5 seconds, also after opening the door. It is convenient to ring 13.

However, if the person who opened the door had malicious intent, of course, since he does not have a legitimate key, the key switch 32 will not close, and the timer circuit 12 will eventually reach the third time. It finishes measuring 15 seconds.

Then, the set / reset circuit 11 supplies a voltage signal to be turned on to the base of the npn-type bipolar transistor 14 selected as the driver transistor 14 of the relay 16 to turn it on, whereby the relay 16 is turned on.
Is excited to close the relay contact of the relay 16 as shown by the phantom line.

If the relay contacts of relay 16 are closed, this shorts horn switch 35, causing horn 36 to ring.

As a result, the horn 36 of the stopped vehicle will continue to ring until it waits for a regular reset operation described later, which is extremely advantageous as an alarm for theft prevention.

Resetting when such an alarm is issued is performed by the authorized holder inserting the key and turning on the key switch 32. When the key switch 32 is turned on, the set / reset circuit 11 turns off the transistor 14 and opens the contact of the relay 16 to stop the horn 36 from ringing. Such a reset operation is the simplest, and is also excellent in that it does not require a dedicated operating device separately. Particularly, as described above, as a grace time until the opened door is closed after the key switch is turned off before the first time period when the measurement is started after the door is first opened, for example, 30 Even if the legitimate driver does not close the door within the second time that can be set to about 2 seconds, this device will generate an alarm for the third time measurement as a door open condition after the second time has elapsed. Conversely, it is also highly desirable that the reset is easy, as it enters the mode. This is because when the horn starts to ring even when there is an authorized driver, it is possible to avoid the inconvenience that it takes a long time and a lot of trouble to stop the horn.

In this embodiment, in addition to the main warning that the horn 36 sounds as described above, a normal warning, or a primary warning, is also installed in a normal automobile before the horn suddenly sounds. Small lamp as a device
I also try to turn on 38.

That is, the timer circuit 12 is capable of measuring the fourth time shorter than the third time, for example, 5 seconds, at the same time as the start of the measurement of the third time, taking 15 seconds as an example. After a lapse of time, the set-reset circuit 11 turns on the driver transistor 15 (also shown as an npn-type bipolar transistor) of the relay 17 by the timer-up signal for the fourth time from the timer circuit 12.
An ON signal is sent to excite the relay 17 to close its relay contact.

The relay contact of this relay 17 normally short-circuits the small lamp switch provided on the vehicle, so that the small lamp 38 is turned on here.

Therefore, even in this state, if the key switch 32 does not turn on for about 10 seconds (15 seconds as the third time minus 5 seconds set as the fourth time), then there, The mechanism described above causes the horn 36 to sound as a full-scale alarm.

For this reason, in this embodiment, after the alarm circuit 10 is set, in the order from when the door is opened, first the auxiliary alarm 13 sounds for 5 seconds, and if the key switch 32 is not turned on during that time, the alarm 13 will be generated. Small at the same time when the sound stops
If the lamp 38 comes on and the key switch 32 is still not turned on for 10 seconds, the horn 36 is finally turned on.
Will start to ring.

It should be noted that a circuit may be constructed so that the small lamp 38 is turned off at the same time as the sounding of the horn, and such modification itself is an arbitrary design change for those skilled in the art as long as the present invention is disclosed.

Of course, the relays 16 and 17 and the driver circuits 14 and 15 thereof can be replaced with other semiconductor switching circuits.

[Effects] As described above, one embodiment of the present invention has been described in detail, but as is clear, the antitheft device of the present invention is as follows in comparison with existing security devices of this type. There are various remarkable effects that can be summarized as follows.

The anti-theft device of the present invention has no special operation required for the driver to set or reset the anti-theft device, and all the existing anti-theft devices are present in a normal automobile. Particularly, the driver actually operates the switch. It is only the operation of the key that feels that there is.

In other words, the present invention enables the alarm set selectively depending on the order of operation of the door switch and the key switch, which are the most basic operation parts or electric switches attached to any vehicle. I'm getting
It is easy for the driver to operate, and it is okay to attach an alarm device as in the past, but since the operation is troublesome, it is possible to greatly reduce the probability of eventually not using or forgetting to use it.

Of course, there are no special and expensive parts (especially expensive sensors) that the user himself / herself has to install in a troublesome manner, and the alarm means is a horn or a horn and a small lamp as a basic automobile electrical component. Therefore, the cost is greatly reduced.

[Brief description of drawings]

The accompanying drawings show a circuit diagram of an embodiment of an anti-theft device of the present invention. In the figure, 10 is an alarm circuit used in this anti-theft device,
11 is a set / reset circuit, 12 is a timer circuit, 13 is an auxiliary alarm circuit, 14 and 15 are relay driver transistors, 16 and 17 are relays, 31 is a battery mounted in a vehicle, 32 is a key switch, 33 is a door switch, 34 is a room lamp, 35 is a horn switch, 36 is a horn,
37 is a small lamp switch and 38 is a small lamp.

Claims (2)

[Claims] 1. When a door of a car is opened with a key switch of the car being turned on and the door switch is turned on, the first time measurement is started until the first time measurement is completed. When the key switch is opened, the second time measurement is started from that time, while the key switch is not opened within the first time and the first time measurement is completed, the initial state is set. Along with returning, when the measurement of the second time is completed, the alarm activation standby state is entered, and there is a grace period from the time when the door switch is detected to be ON under the alarm activation standby state until the alarm activation. A timer circuit for starting measurement of the third time, and when the key switch is turned on within the third time, interrupts measurement of the third time and returns from the alarm activation standby state to the initial state. The above timer times When the road is above the
When the switch is opened, the reset state up to that point is changed to the set state, and when the timer circuit completes the measurement of the third time under the set state, the alarm is activated and the horn mounted on the automobile. A set / reset circuit in which the switch is short-circuited and the horn is activated as a theft alarm means, while the key switch is turned on under the alarm activation condition, the short circuit of the horn switch is released and the reset state is returned to; An anti-theft device for an automobile, comprising: 2. The timer circuit starts measuring a fourth time shorter than the third time at the same time when the measurement of the third time is started; The third small lamp switch mounted on the vehicle is short-circuited at the time when the fourth time measurement is completed before the completion of the third time measurement, and the small lamp is turned on as the primary theft alarm means. The device according to claim 1, characterized by: