JPS6130450A - Theft-proof device of automobile - Google Patents

Abstract

PURPOSE:To enable a person of being informed of a theft behavior against an automobile even if the person is in a far location by providing a wireless mobile station for a carriable tool which can be carried by a user so that an alarm device of a vehicle may be operated and an indicator on the carriable tool is also operated by the action of radio if a theft of the vehicle is sensed. CONSTITUTION:In case this invention is embodied to a passenger car, a transmission and receival part 2 which transmits and receives radio waves (a) and (b) via an antenna 3 is disposed inside the car and functions as a wireless fixed station A. On the other hand, a carriable tool 5 which a user can have by the hand and carry functions as a wireless mobile station B and consists of a transmission and receival means 6 which transmits and receives the radio waves (a) and (b), an oscillation switch 5a and an antenna 7. A vehicle 1 is provided with a touch detector 11, a wheel revolution detector 12, a vehicle vibration detector 13, an engine start detector 14 and other theft-proof sensing means. Once such theft-proof sensing means senses a theft of the vehicle, the means has the alarm device of the vehicle 1 operated and the indicator of the mobile station B inform the user of the theft behavior.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a vehicle anti-theft device.

[Prior art]

Traditionally, anti-theft devices for vehicles include installing a handle lock mechanism, installing a key (1 chain in the wheel), and installing an alarm device that generates an alarm when the vehicle is touched or vibrated. Measures such as establishing a but,
These conventional means have the disadvantage that if a theft is committed, such as transporting the vehicle using a crane, the user cannot confirm this when the user is in a remote location away from the vehicle.

Furthermore, the above-mentioned device that generates a warning sound when the vehicle is touched or vibrates has the disadvantage that it also generates a sound when the user touches the vehicle himself, making it impossible to distinguish it from actions by other people.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle anti-theft device that allows a user to confirm theft even if the user is in a remote location, and also allows the user to easily distinguish between the user and another person.

[Structure of the invention]

To achieve the above-mentioned object, the vehicle anti-theft device of the present invention includes a transmitter/receiver section in a vehicle, and a W.
An alarm device is provided to issue a warning, and the portable device is provided with a transmitting/receiving unit that sends a reply signal based on a signal from the transmitting/receiving unit on the vehicle side, and a display unit that displays reception of the signal, and the portable device is provided with a reply signal from the portable device. It is characterized by being set to be weaker than the signal transmitted from the vehicle.

[Embodiments of the invention]

Hereinafter, the present invention will be explained with reference to embodiments shown in the drawings.

In Figure 1, ■ is a passenger car, and radio wave a is placed inside the car as far away from the engine as possible.

A wireless fixed station A is constructed by providing a transmitting/receiving section 2 for transmitting and receiving signals b and an antenna 3 at the rear. In addition, as theft detection means 4, a passenger car includes a contact detector 11 for detecting stray capacitance on the surface of the vehicle body, a rotation detector 12 for detecting the rotation of a wheel provided in a meter such as a speedometer, and a mercury detection means 4. A vibration detector 13 for detecting vehicle body vibration using a switch, etc., a start detector 14 for detecting engine starting, and a pressure installed in a shock absorber for detecting that the vehicle body is lifted off the ground. Detector 1
5. An unlock detector 16 and the like are provided for detecting that the handle lock provided on the main switch is unlocked. This theft sensing means 4 does not necessarily need to include all of the above-mentioned detection devices, and may selectively provide some of them.

On the other hand, a movable jilt device 5, which the user carries in his/her hand, is provided to the vehicle 1 that serves as the fixed station A. This movable jilt device 5 serves as a wireless mobile station B, and the , b, as well as a transmission switch 5a and an antenna 7, and is small enough to be carried in a pocket or the like.

FIG. 2 shows another example in which the vehicle is a motorcycle 1 degree, in which a wireless fixed station A is configured by similarly providing a transmitter/receiver section 2 and an antenna 3 at the rear of the vehicle body. Further, as the theft detection means 4, a rotation detector 12 is installed in the meter, and a vibration detector 1 is installed at the rear of the vehicle body, as in the case of the passenger car 1 described above.
3 and a start detector 14, a pressure detector 15 for the shock absorber, an unlock detector 16 for the main switch, and the like. For this vehicle 1'', as in the case of the passenger car 1,
A portable device 5 serving as a mobile station B is provided.

In the transmitting/receiving unit 2 of the fixed station A shown in FIG. 1.2 above, as shown in the block diagram of FIG. 32, antenna 3 via amplifier circuit 33
It is now transmitted as radio wave a. On the other hand, the antenna 7 of the mobile station B receives the radio wave a and processes it in a demodulation circuit 41, a reception circuit 42, and an amplification circuit 43 as shown in the block diagram of FIG. It is displayed on the display device 45 via 44.

As this display device 45, a lamp, a light emitting diode (
A lighting or blinking display such as an LED (LED) or a liquid crystal display (LCD), or a continuous or intermittent alarm such as a buzzer or voice are used. Further, the signal from the drive circuit 44 passes through a transmitter circuit 46, a transmitter circuit 47, and an amplifier circuit 48 and transmits a weak return radio wave from the antenna 7 by simultaneously operating the transmitter switch 5a.

The return radio wave emitted from the antenna 7 of mobile station B is set to be significantly weaker than the transmission radio wave a emitted from fixed station A, with a slight radio wave of about 1 to 5 meters. It is designed to have only the reachable distance. Therefore, when the user is in a remote location away from the vehicle, the weak return radio waves will not be picked up by the antenna 3 of the fixed station A. If the return radio wave is not received by the antenna 3 in this way, the demodulation circuit 34 and the reception circuit 35 at the fixed station A will not operate, and therefore the signal conversion circuit 31 will
The drive circuit 36 is activated by the detection signal from the theft detection means 4, and the alarm device 37 is driven. As the alarm device 37 at this time, a vehicle horn may be used, or a device specially provided for an anti-theft device may be used.

On the other hand, if the user himself comes into contact with the vehicle,
Since the portable device 5 is near the vehicle, the weak radio waves emitted from the antenna 7 of the portable device 5 are caught by the antennas 3 of the vehicles 1 and 1', thereby activating the demodulation circuit 34 and the receiving circuit 35. The signal is input to the signal conversion circuit 31. Therefore, the signal conversion circuit 31 does not operate the drive circuit 36 based on the detection signal from the theft detection means 4, and the alarm device 37 is not driven.

Therefore, the anti-theft device consisting of the fixed station A and the mobile station B is capable of distinguishing whether the signal from the theft sensing means 4 is from the user himself or from another person.

FIG. 5 shows a flowchart showing mutual communication processing between the fixed station A and mobile station B. As shown in this flowchart, the anti-theft device includes:
After determining that the person near the vehicle is the user, the door locks and steering wheel locks are automatically released when the user touches the vehicle.
A control system may be provided that enables the engine to start when the ACC and ignition switch are turned on thereafter. It also has a trunk, hood, and helmet holder at the same time.

A control system may be provided to unlock the fuel tank lid or the like.

Further, in the above-described device, a different alarm based on the theft signal may be generated depending on the theft mode. For example, if a signal is detected that is a simple contact with the vehicle body or a weak vibration of the vehicle body, the alarm on the fixed station A side will not be activated, and only the warning will be displayed on the display device on the mobile station B side. strong vibrations of the car body, unlocking, starting, wheel rotation,
It is also possible to configure the alarm device to issue the main alarm only when a signal such as the lifting of the vehicle body is detected.

In the above embodiment, the transmitter/receiver unit communicates using radio waves as a signal medium, but ultrasonic waves may be used instead of radio waves.

〔Effect of the invention〕

As described above, the vehicle anti-theft device of the present invention is provided with a transmitting/receiving section in the vehicle and an alarm device that issues an alarm upon reception of the transmitting/receiving section, while sending a reply to the portable device using a signal transmitted from the transmitting/receiving section on the vehicle side. A transmitter/receiver unit that transmits a signal and a display unit that displays the reception of the signal are provided, and the return signal from the portable device is set to be weaker than the signal transmitted by the vehicle.
Even if the user is in a remote location, it is possible to confirm the theft, and it is also possible to easily distinguish whether a person near the vehicle is a user or someone else.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram showing an embodiment in which the vehicle equipped with the anti-theft device of the present invention is a passenger car, and FIG. 2 is a schematic explanatory diagram showing another embodiment in which the vehicle is also a motorcycle. , FIG. 3 is an explanatory diagram showing a block diagram for the fixed station in the vehicle anti-theft device, FIG. 4 is an explanatory diagram showing a block diagram of mobile station B, and FIG. 5 is an explanatory diagram showing the block diagram of the mobile station B in the vehicle anti-theft device. It is a flowchart figure explaining operation|movement. 1...Passenger car, 1゛...Motorcycle, 2.6.
...Transmission/reception section, 3, 7... Antenna, 4... Theft detection means (11... Contact detector, 12... Rotation detector, 13... Vibration detector, 14... Start Detector,
15...pressure detector, 16...unlocking detector), 3
7...Alarm device, 45...Display device.

Claims (1)

[Claims] The vehicle is provided with a transmitting/receiving section and an alarm device that issues an alarm upon reception of the transmitting/receiving section, while the portable implement is provided with a transmitting/receiving section that transmits a reply signal based on the transmission signal of the transmitting/receiving section on the vehicle side;
A theft prevention device for a vehicle, characterized in that a display section is provided to display reception of the signal, and a return signal from the portable device is set to be weaker than a signal transmitted from the vehicle.