JPS6144057A - Autotheft preventer - Google Patents

Abstract

PURPOSE:To prevent the occurrence of autotheft in a simple and accurate manner, by letting a device perform the specified motion for prevention against the autotheft at a time when a car position to be detected by a car position detecting device oversteps the bounds of a preset allowable zone. CONSTITUTION:A position detecting device, detecting a car position and outputting present position data D1, and a zone setting device 20 setting an allowable zone for the car position both are installed, and these output signals are inputted into a discriminating device 30. At this discriminating device 30, both these input signals are compared with each other, whereby that whether the car position is within the allowable zone or not is judged, and when the present position of a car is out of the allowable zone, it is judged as autotheft. And, when the case is judged as the autotheft, a warning device 40 and a travel stopping device 50 are operated, preventing the car from being stolen. With this constitution, the car is freely driven within the bounds of the allowable zone, while plural drivers are possible to use the car in common.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a vehicle theft prevention device that can prevent vehicle theft with a simple preliminary operation.

(b) Prior Art Recently, anti-theft devices for vehicles using electronics have been proposed. For example, in Utility Model Application No. 58-52019, a driver carries a transmitter that emits radio waves or ultrasonic waves,
If a driver sends out radio waves or ultrasonic waves from a transmitter within a designated reception area, a receiver installed in the vehicle will receive the radio waves or ultrasonic waves to unlock the door or enable the driver to start driving. A car has been disclosed that, when someone tries to open the door or start the car while outside, issues an alarm or stops the engine, making it impossible to drive. It is thought that there is a relationship similar to that of a lock.

(c) Problems to be Solved by the Invention In this type of vehicle anti-theft device, if the transmitter is within a predetermined area, it is assumed to be normal and the door lock is released or the vehicle can start. Vehicle theft cannot be prevented if a transmitter is stolen or a transmitter that emits a signal from a fellow vehicle is made. Furthermore, when a single vehicle is driven by multiple drivers, there is the inconvenience of having to hand over the transmitter each time, and the inconvenience of having to prepare multiple transmitters.

(d) Object and structure of the invention The present invention has been made in view of the above points, and aims to prevent theft by a simple preliminary operation of setting a permissible zone. A permissible zone is set in advance, and when the vehicle leaves the permissible zone, a warning is issued or the vehicle becomes unable to drive.

FIG. 1 shows the overall configuration of the anti-theft device according to the present invention, in which the position of the vehicle is detected by a position detection means, and a zone deviation judgment is made by determining whether the position is within or outside a preset tolerance zone. If the device is out of the permissible zone, it is considered theft and an action is taken to prevent theft.

(e) Examples The present invention will be explained below based on the drawings.

FIG. 2 shows an embodiment of the vehicle theft prevention device according to the present invention, in which lO detects the position of the vehicle and current position data D
Position detection means for outputting I, 201
3 is a zone setting means for setting a permissible zone for the vehicle position;
0 is a determining means for comparing and judging the current position data DI of the vehicle outputted from the position detecting means 10 and the permissible zone data D2 set by the zone setting means 20 to determine whether the vehicle position is within or outside the permissible zone; If the current position of the vehicle is outside the permissible zone according to the determination data D3 as a result of the determination by the determining means 30, the alarm means 50 issues an alarm as the vehicle is stolen. This is a means to stop the vehicle from running by, for example, stopping the engine.

Next, the contents of each component will be explained in detail.

The position detection means 10 detects the traveling direction of the vehicle using geomagnetism, a gyro, etc., and also detects the traveling distance by integrating the number of rotations of the wheels, etc., and determines the current position of the vehicle from the traveling direction and the traveling distance from the starting point. It receives radio waves from a detection device (for example, the travel course guidance device disclosed in JP-A No. 58-223708) or a transmitter installed at a predetermined point, detects the distance from that point, and determines the current location. (for example, the mobile track display device disclosed in Japanese Patent Laid-Open No. 57-56705), etc., and if necessary, a D is installed between these devices and other blocks.
/A conversion circuit etc. is provided.

The zone setting means 20 is composed of a data input device for inputting position data, a memory for storing the input position data, a processing device for arithmetic processing of the position data, and the like.The position data input device can be a keyboard or voice input. It can be configured by devices, etc. A programmable memory such as FROM or EFROM may be used as the memory for storing position data, and position data unique to the vehicle may be inputted in advance, and in this case, a position data input device is not required. In addition, the position data input device can be connected only when inputting position data, and can be disconnected at other times.The arithmetic unit that processes the 0 position data is a microprocessor sensor or random logic. 4 points a for which the latitude and longitude have been input, for example, as shown in Figure 4 (a)
.

You can calculate the area surrounded by b, c, and d as a tolerance zone, or calculate the position data of a point m with specified latitude and longitude as shown in Figure 4 (b), and from this point to the boundary of the tolerance zone. Distance data specifying the distance 1liI11 is input, and an area of radius p centered at point m is calculated as an allowable zone, or a line corresponding to a normal driving route as shown in Fig. 4 (c) is input. The permissible zone is calculated by a method such as calculating a predetermined distance range from the data (realized by a plurality of point data and interpolation calculations for the data) and the line data as the permissible zone.

The determining means 30 is also constituted by a microprocessor or random logic, and performs a comparison operation between the coordinates of the boundary of the permissible zone and the coordinates of the current position of the vehicle.

The alarm means 40 is realized by a device that notifies people outside that theft has occurred by emitting sound (horn), light (headlights), or radio waves.

The running stop means 50 is a device for cutting off the supply of fuel or air to the engine, stopping ignition, a device for forcing the transmission into a neutral state, or a device for disengaging the clutch (these operations are for transmission control). (This can be achieved by releasing and lowering the hydraulic pressure of the engine), or by a device that operates the brake.

Next, the operation of the vehicle anti-theft device will be explained using the flowchart shown in FIG.

First, the driver, vehicle owner, or manager sets a permissible zone according to the purpose and use (F-1).

Setting of the permissible zone is performed using the keyboard or voice input device that constitutes the zone setting means 20, and the setting method may be, for example, a zone within several kilometers from one's home, a zone within several hundred meters from a transportation route, etc. As an example, in the following operation, the point m
(m, l, m a) and the side centered on this point is 27!
shall be set as the tolerance zone,
Enter the coordinates of the boundary points of this area as a table.

In step (F-2), the current position D of the vehicle is determined based on the direction data and distance data from the position detection means 10.
Zero-order step (F-3) to calculate I (x, y)
In this step, the positional data of the allowable zone already set by the zone setting means 20 and stored in the memory, namely the coordinates (m5°m) and the radius l of the point m, are read out.

Next, in step (F-4), the determining means 30 determines the deviation between the current position DI (x, y) of the vehicle and the center position m (Cmx + my) of the tolerance zone as the X coordinate,
It is determined whether the vehicle is located within the permissible zone by determining each coordinate and checking the magnitude relationship between the deviation and a value l indicating the permissible range. As a result of the determination, if it is within the permissible zone, the process returns to step (F-2) and the above-described operation is repeated. Conversely, when the vehicle is outside the tolerance zone, step (
F-5), the alarm means 40 issues an alarm using sound, light, radio waves, etc., locks the doors, and transmits the vehicle's current location DI (x, y) to a control center, etc., and determines the location of the stolen vehicle. Let me know.

Next, in step (F-6), the hazard switch of the vehicle is forcibly turned on based on the output from the determining means 30.
The hazard lamps are flashed, the vehicle is decelerated and stopped, and the engine is then stopped in step (F-7).

In this way, if the stolen vehicle deviates from the permissible zone, an alarm will be issued and the vehicle will be unable to drive, thereby preventing theft.

Afterwards, when the vehicle returns to its rightful owner or custodian, the door lock state and engine stop state must be reset, so it is natural to install the center switch in a position that is difficult for criminals to operate. Also, it is important that this reset is done reliably by a reliable person, so
It is preferable to use a portable card or the like that has a built-in radio wave transmitter that transmits a coded signal. Then step (F
In step (F-8), it is repeatedly determined whether or not the reset switch has been turned on, and if the reset switch has been turned on, the theft prevention means such as the door lock is released in step (F-9).

In the present invention, only one of the alarm means 40 and the traveling stop means 50 may be provided, but if they are used together to make it impossible for the vehicle to travel and further notify the location of the stolen vehicle by radio, then Useful for locating stolen cars.

As another example, if the position where the vehicle is stopped (parked) is detected by the position detecting means 10, the position data is stored in the memory as the coordinates of the point m, and the distance i within the allowable range is set small, the vehicle If the car moves even slightly away from the parked position, anti-theft devices such as alarms are activated, so theft can be prevented at an early stage.

As yet another embodiment, if the boundary data of the tolerance zone is fixed and stored using a FROM or the like, a position data input means for installing the tolerance zone becomes unnecessary, and the tolerance zone cannot be easily changed. Therefore, it is possible to expect a higher prevention effect against theft.

Further, in the above embodiment, if the determination means 30 is configured with a microprocessor or a microcomputer, the determination process can be executed simultaneously with the calculation process of the current position of the vehicle.

In addition to preventing theft of vehicles, the present invention can also be used as a device for prohibiting unlocking of luggage compartment doors in freight cars, etc., and can also be useful for security of cash transport vehicles.

(v) As described in detail, in the present invention, when the vehicle deviates from a predetermined permissible zone, it is determined that the vehicle has been stolen and the anti-theft device is activated. The vehicle can be driven freely, multiple drivers can use it, there is no fear of the transmitter being stolen, and there is no fear of the transmitter being unlocked or stolen due to copying.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of a vehicle anti-theft device according to the present invention;
FIG. 2 is a block diagram of one embodiment of the vehicle anti-theft device according to the present invention, FIG. 3 is a flowchart of the theft, detection and prevention operations of the vehicle anti-theft device according to the present invention, and FIG. 4 is an example of different tolerance zones. FIG. 10... Position detection means, 20... Zone setting means,
1 30...determination means, DI, D2. D
3...Data, 40...Alarm means, 50...Travel stop means Patent applicant Nissan Motor Co., Ltd. Figure 1 Figure 2 Figure 4

Claims (1)

[Scope of Claims] Position detecting means for detecting the position of the vehicle; zone departure determining means for determining whether the vehicle position deviates from a predetermined tolerance zone; and determining whether the vehicle position is determined based on the result of the determining means. 1. A vehicle anti-theft device comprising: anti-theft means that performs a predetermined operation for preventing theft when the vehicle is out of a permissible zone.