JPH03213447A - Burglar preventing device for automobile - Google Patents

Abstract

PURPOSE:To form a burglar preventing device without using a special part by forming a burglar preventing circuit based on a combination relation between the ON and OFF state of a key switch and the state of a door switch, and sounding a horn when operation is not effected in a given order. CONSTITUTION:When an alarming device is set before leaving an automobile, an automobile door is opened before a key switch 32 is turned OFF for the stop of an engine. In which case, a door switch 33 is turned ON and a timer circuit 12 is energized. When the key switch 32 is turned OFF within a set time (approximate five seconds) of the timer circuit 12, a set reset circuit 11 in an alarming device is brought into a set state. After the key switch 32 is turned OFF, the timer circuit 12 starts counting of a second set time (approximate 30 seconds), and when a set time elapses, the alarming is brought into a waiting state capable of sounding an alarm. when, with this state, a door is opened by a person having no key, a horn switch 35 is closed through a relay 16, and a horn 36 is sounded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an anti-theft device for automobiles, and in particular, it does not require special sensors or switches, and also requires the operation of special switches to set an alarm. Regarding an unnecessary anti-theft device.

[Prior Art] Conventionally, when a driver leaves a car, an alarm circuit is set, and then when the car door is opened or the presence of a moving object inside the car is detected, the alarm circuit is activated. Various anti-theft devices have been developed that sound the horns already installed in automobiles.

[Problems to be Solved by the Invention] However, all of the conventional methods require special and expensive sensors such as infrared sensors and radar detectors that utilize the Doppler effect to be separately installed in the vehicle interior, or For example, a hidden switch must be installed in the passenger compartment or a separate remote control device must be prepared to activate the alarm circuit, which ultimately increases costs and requires the driver to perform cumbersome operations. This was a major hindrance to its widespread use.

In view of this point, the present invention does not require the installation of special parts into the vehicle interior, and in particular allows the driver to set the alarm circuit using devices that are normally provided in ordinary automobiles. The present invention was designed to provide a simple and reliable anti-theft device for automobiles that does not require the manipulation of special parts.

[Means for Solving the Problems] In order to achieve the above object, the present invention first determines the on/off state of a so-called 1Φ key switch that controls the operation and stop of an internal combustion engine of an automobile, and, for example, a room lamp. on/off
We focused on the state of the door switches used to turn off the door, warn when the door is open, etc., and designed the system so that the user (driver) only needs to operate these switches in a predetermined order.

That is, in order to satisfy this requirement, the car door is opened while the car key switch is turned on, and when the door switch is turned on, the first time measurement begins.
If the key switch is opened before the measurement of the first time is completed, the measurement of the second time starts from that point, but the key switch is not opened within the first time and the second time continues. We prepared a timer circuit that returns to the initial state after completing one time measurement.

Furthermore, this timer circuit is configured to start measuring a third time from the moment it detects that the door switch is on after the completion of measuring the second time described above, but within this third time. When the key switch is turned on, the measurement for the third time is interrupted and the system returns to the initial state, just as it did when the measurement for the first time was completed.

On the other hand, as a control circuit that operates according to the time measurement state of this timer circuit, when the key switch is opened while the timer circuit is measuring the above-mentioned time, the timer circuit enters the set state;
In addition, a set/reset circuit is provided which shorts out a horn switch mounted on the automobile and causes the horn to sound when the timer circuit completes the measurement of the third time under this set state. Therefore, the horn normally provided in automobiles is also used as a theft alarm means.

In addition, as one embodiment of the present invention, a simple means for stopping the alarm means is also disclosed, in which the horn sounds and the authorized owner of the vehicle who notices this, inserts the key and locks the key.
When the switch is turned on, the set/reset circuit described above is adapted to unshort the horn switch.

Furthermore, although the horn is the most effective burglar alarm means as described above, it is more convenient to turn on a small lamp before the horn sounds. for example,
With the above configuration, after the timer circuit has measured the second time, the timer circuit will start measuring the third time even if the authorized driver opens the door. If the authorized owner does not insert the key switch before the measurement is completed, a flashy warning will be issued with the horn blaring.

Therefore, as a preliminary or primary warning before the horn sounds, it is helpful for the legal owner to turn on the vehicle's small lamps.

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

[Function] The anti-theft device of the present invention can open and close a car door based on a predetermined combination relationship between opening and closing a car door and turning on and off a key switch, without having to operate special switches provided separately. It works as follows.

If the driver of a motor vehicle wishes to set the alarm before leaving the motor vehicle, he must first open the motor vehicle door before turning off the key switch to stop the engine.

Then, the timer circuit starts measuring a first period of time, for example 5 seconds. If this is not the case, for example, if the key switch of the car is turned off and then the door is opened, the device will not work. Of course this is important. In fact, it is inconvenient for this type of device to always work.

Employees must be able to work only when needed, according to the will of the employer.

In addition, if the timer circuit starts counting the first time period as a result of the door being opened, but the key switch is not opened and the opening side of the first time period is completed, the timer circuit also starts counting. The circuit returns to its initial state. This assumes, for example, a case where the door is opened but the engine is not stopped; in such cases, the driver of the car generally does not leave the vehicle for a long time, and it is difficult to restart the vehicle. This is because it seems normal and there is no need to set up this alarm device.

On the other hand, if the driver wishes to set the device, the key switch should be turned off before the timer circuit finishes measuring the first period of time (for example, about 5 seconds as before). Just do it.

By doing this, the set/reset circuit within the alarm device will essentially enter the set state, and in order to buy time for the driver to get out of the car and occupy the door, the key After the switch is turned off, the timer circuit starts counting a second period of time (for example, about 30 seconds).

Once the timer circuit completes measuring this second period of time, the device essentially enters a standby state in which it can trigger an alarm based on subsequent opening of the door, and the door switch is activated after the completion of the second period of time measurement. The timer circuit starts measuring the third time from the moment it detects that the is on.

This third time is set to allow time to reset the alarm device if the person who opens the door is the authorized vehicle owner. For example, this third time should be selected to be around 15 seconds. I can do it. That is, if the key switch is turned on within this third time period after opening the door, the timer circuit interrupts the measurement of the third time period and returns to the initial state.

However, if the person who opened the door had malicious intent, they would naturally not have the legitimate key, so the key switch would not be closed, and the timer circuit would eventually reach the third time. The measurement is completed.

Then, the set/reset circuit short-circuits a horn switch mounted on the vehicle, causing the horn to sound, thereby warning that some abnormality has occurred in the vehicle, such as theft.

According to one aspect of the present invention, resetting when such an alarm is activated is performed by the authorized holder inserting the key.
This is done by turning on the key switch. This method is the simplest and is advantageous in that it does not require any special operating devices. In particular, even if the authorized driver does not close the door within the second period of time, which can be set as a grace period of about 30 seconds as described above, this device will close the door after the second period has elapsed. Conversely, ease of resetting is also highly desirable in practice, since the alarm mode is entered upon the occurrence of an open condition, and according to yet another aspect of the invention, this also normally occurs before the horn suddenly starts sounding. In the case of a car, the small lamp installed on the car can be used as a preliminary or primary warning means and can be turned on.

That is, according to this other aspect of the present invention, the timer circuit is capable of measuring a fourth time shorter than the third time at the same time as starting measurement of the third time, and after the fourth time has elapsed, First, the set/reset circuit shorts the small lamp switch, so if the third time is set to about 15 seconds as described above, then the fourth time should be set to about 5 seconds, which is shorter. For example, if about 5 seconds pass without the key switch being turned on after the door is opened, the small lamp will light up first, and then the key switch will not turn on even after the door is opened for about 10 seconds (third time - the fourth time), the horn will sound for the first time as a full-fledged alarm.

1 [Embodiment] The attached drawing shows a circuit configuration of an embodiment of an automobile anti-theft device constructed according to the present invention.

The battery 31 is normally a DC power source installed in a car, and the key switch 32 is used to start and stop the engine and to turn on and off various electrical components as usual. Therefore, its output line (battery power supply line) is simply marked with an arrow except for the line involved in the alarm circuit IO of the anti-theft device.

Similarly, this is one of the basic electrical components normally installed in a car, such as selectively lighting up the room lamp 34 (only one is shown), or when the door is opened (not shown). Four door switches 33 are also shown, which are used to warn the driver that the door is open and turn on and off in conjunction with the opening and closing of the door (that is, detect the opening and closing). The reason why there are four is because a so-called four-door car is assumed, and the number of door switches 33 that are in a parallel relationship with each other changes depending on the number of doors. On the other hand, in the case of special commercially available vehicles, the door on the driver's side
In some cases, only the switch is independent from other switch systems. In such a case, you can assemble this device focusing only on the door switch on the driver's side, or by using an appropriate buffer circuit (not shown), it is possible to assemble the device by focusing only on the driver's door switch. Even if the timer circuit 12 is opened, the timer circuit 12 described later can be made operable.

Other existing devices or existing parts that can be reasonably used in the anti-theft device of this embodiment include the horn (which is normally used in any automobile as a basic electrical component).
horn) 36 and small lamps 38 (only two shown in parallel relationship).

Of course, when the horn switch 35 connected in series is closed by the driver's operation of the horn button, the horn 36 is connected to both ends of the battery 31 and sounds, and the small lamp 38 also starts operating. Base lamp switch 37 (simply shown as a single circuit open/close switch)
When the small lamp lighting position is selected by the operation, the small lamp enters both ends of the battery 31 and lights up.

Hereinafter, the operation of the alarm circuit 10 related to the present theft prevention device using such existing parts will be explained over time.

If the driver of the vehicle wishes to set the alarm before leaving the vehicle, he must 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 potential of the contact connected to the battery hot side end of the group of door switches 33 drops to approximately the ground potential, and therefore, the door opening/closing signal is input here. The timer circuit 12 connected to the end can know that the door has been opened and starts counting a second time, for example 5 seconds, from this point.

However, if the above order is reversed and the key switch 32 of the car is turned off before opening the door, this device will not work. If the key switch 32 is turned off first, the set/reset circuit 11 in the alarm circuit 10 cannot receive power from the battery 31 through another power supply path after the key switch 32 is turned off. Unfortunately, the timer circuit 12 does not work either.

This is important as mentioned earlier.

It is rather inconvenient that the alarm circuit 10 must work. They must be able to work only when needed, in accordance with the will of the employer.

Also, as a result of the door being opened, the timer circuit 12 starts measuring the first time (here, about 5 seconds), but the key
Even if the switch 32 is not opened and the measurement of the first time period (5 seconds) is completed, the timer circuit 12 returns to the initial state. This assumes, for example, a case where the door is opened but the engine is not stopped; in such cases, the driver of the car generally does not leave the car for a long time, and some people may This is because it seems normal to start operating again.

On the other hand, if the driver wishes to set this device, he can turn off the key switch 32 until the timer circuit 12 finishes measuring the first time of approximately 5 seconds. .

In this way, the set/reset circuit 11 in the alarm device will essentially enter the set state, and in this embodiment, in order to notify the driver that it is not in the set state,
The auxiliary alarm 13 sounds from the timer circuit 12 for a predetermined period of time, for example, about 5 seconds. This auxiliary alarm 13 is not intended to issue a burglar alarm, so it is best to emit a small sound.
A small piezoelectric vibrating element or any other suitable known sound generator can be used.

Once in such a set state, the timer circuit 12 is activated for a second period of time (e.g., 30 (in seconds).

Once the timer circuit 12 completes counting this second period of 30 seconds, the device essentially enters a standby state in which it can trigger an alarm based on subsequent opening of the door. After the measurement is completed, the timer circuit 12 starts counting a third period of time (for example, 15 seconds) from the time when it is detected that the door switch 33 is on. This third time is set to buy time for resetting the alarm device if the person who opens the door is the authorized vehicle owner.

Therefore, if the key switch 32 is turned on within this third time after the door is opened (after the door switch 33 is turned on), the timer circuit 12 interrupts the measurement of the third time. Return to initial state. In addition, in order to prompt the authorized driver to insert the key after opening the door, an auxiliary alarm, which was also used when setting up this device earlier, is set for a predetermined period of time, for example, 5 seconds, after the door is opened. 13
It's convenient without making any noise.

However, if the person who opens the door has malicious intent, of course he does not have the proper key, so the key switch 32 will not close and the timer circuit 12 will eventually reach the third time. The measurement of 15 seconds is completed.

Then, the set/reset circuit 11 applies a voltage signal to turn on the base of the npn bipolar transistor 14 selected as the driver transistor 14 of the relay 16, turning it on. When energized, the relay contacts of the relay 16 close as shown by the phantom linking line.

When the relay contact of relay 16 closes, it shorts out horn switch 35, so horn 36 becomes I]Hj.

As a result, the pawn 36 of the parked car continues to ring until it waits for a proper reset operation, which will be described later, and is extremely advantageous as an alarm for preventing theft.

In this embodiment, the reset 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, opens the contacts of the relay 16, and stops the horn 36 from sounding. This kind of reset operation is the simplest and is also advantageous in that it does not require a separate dedicated operating device. In particular, even if the authorized driver does not close the door within the second period of time, which can be set as a grace period of about 30 seconds as described above, this device will close the door after the second period has elapsed. Conversely, it is actually extremely desirable that the reset is easy, since the third time measurement alarm mode is entered upon the occurrence of an open state. This is because it avoids the inconvenience of having to take a long time and complicated efforts to stop the horn when it starts honking even though there is a legitimate driver present.

In this embodiment, in addition to the main warning of sounding the horn 36 as described above, a pre-warning, or rather a primary warning, is provided before the horn suddenly sounds, which is also installed in a normal car. A small lamp 38 as a device is also turned on.

In other words, timer circuit [2] is configured to be able to measure a fourth time shorter than the third time, for example, 5 seconds, at the same time as the measurement of the third time, 9 for which 15 seconds was taken as an example, is started. After the fourth time has elapsed, a time-up signal for the fourth time from the timer circuit 12 causes the set/reset circuit 11 to control the driver transistor 15 of the relay 17 (
(also shown as an npn bipolar transistor) sends a turn-on signal to energize relay 17, causing its relay contacts to close.

The relay contacts of this relay 17 normally short-circuit the small lamp switch provided in the vehicle, so that the small lamp 38 is now turned on.

Therefore, even in this state, the key switch 32 is still not turned on for about 10 seconds (the time obtained by subtracting 5 seconds set as the fourth time from 15 seconds, which is the third time)
Over time, starting from there, by the mechanism mentioned earlier,
The horn 36 will start buzzing as a full-fledged warning.

For this reason, in this embodiment, after the alarm circuits 0 to 10 are set and the door is opened, the auxiliary alarm 13 will sound for 5 seconds, and if the key switch 32 is not turned on during that time, the alarm 13 will sound. As soon as the sound stops, the small lamp 38 lights up, but the key still
If another 10 seconds elapse without the switch 32 being turned on, the horn 36 will eventually come out.

In addition, at the same time as the horn starts sounding, the small lamp 38
The circuit may be configured to turn off the light, and such a modification itself will be an arbitrary design change for those skilled in the art since the present invention has been disclosed.

Of course, relays 16 and 17 and their driver circuits 14
, 15, etc. can be replaced with other semiconductor-based switching circuits.

[Effects] The details have been described above based on one embodiment of the present invention, but as is clear, the theft prevention device of the present invention has the following advantages compared to existing crime prevention devices of this type. It has various remarkable effects that can be summarized as follows.

■The anti-theft device of the present invention does not require any special operations from the driver because of its set, and all of them are already existing in ordinary automobiles, especially when the driver actually operates the switches. The only thing that makes you feel this way is the key operation.

In other words, the present invention makes it possible to selectively set alarms depending on the order of operation of the door switch and key switch, which are included as the most basic operating parts or electric switches in any automobile. Since it is possible to
Drivers can easily operate the system, and the probability that they end up not using it or forgetting to use it can be greatly reduced, unlike conventional warning systems that are troublesome to operate.

■Of course, special and expensive parts (especially expensive sensors) that the user himself must install inside the vehicle -
Since the warning means is a horn or a horn and a small lamp, which are basic automobile electrical components, the cost is also greatly reduced.

[Brief explanation of drawings]

The accompanying drawing shows a circuit diagram of an embodiment of the anti-theft device of the present invention. In the figure, IO is an alarm circuit used in this anti-theft device, 11 is a set/reset circuit, 12 is a timer circuit, 1
3 is an auxiliary alarm circuit; 14 and 15 are relay driver transistors; 16 and 17 are relays; 31 is a battery installed in the automobile; 32 is a key switch;
33 is a door switch, 34 is a room lamp, 35 is a bone switch, 36 is a bone, 37 is a small lamp switch, and 38 is a small lamp.

Claims (3)

[Claims] (1) When the door of the car is opened while the key switch of the car is turned on, and the door switch is turned on, the measurement of the first time starts, and by the time the measurement of the first time is completed, the above-mentioned When the key switch is opened, the measurement of the second time starts from that point, but when the key switch is not opened within the first time and the measurement of the first time is completed, the system returns to the initial state and returns to the initial state. , from the time when it is detected that the door switch is on after the measurement of the second time is completed, a third time starts to be measured, and when the key switch is turned on within the third time, a timer circuit that interrupts the measurement of the third time and returns to the initial state;
When the switch is opened, it enters the set state, and when the timer circuit completes the measurement of the third time in the set state, it short-circuits the horn switch installed in the automobile, and uses the horn as a burglar alarm means. An anti-theft device for an automobile, comprising: a set/reset circuit that causes a sound to sound; 2. The apparatus according to claim 1, wherein the set/reset circuit short-circuits the horn switch and releases the short-circuit when the key switch is closed. (3) The timer circuit starts measuring a fourth time that is shorter than the third time at the same time as it starts measuring the third time; When the measurement of the fourth time is completed before the completion of time measurement, a small lamp switch installed in the automobile is short-circuited, and the small lamp is turned on as a primary theft alarm means. The device according to claim 1 or 2, characterized in that;