JP2001034855A - Vehicle robbery warning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect a moving object outside a vehicle within a suitable range even when a window is closed and further to stepwisely change a warning. SOLUTION: A radio wave generator 1 of the vehicle robbery warning device is provided with a volume switch capable of controlling the detection range and a warning output 6 is added with a timer circuit 5 capable of controlling the time of operation start and changing a warning signal corresponding to how long a moving object detecting signal is continued. The volume switch can appropriately change a reaction range corresponding to the size of the vehicle with an antenna 2 as a center and the timer circuit 5 is enabled in a duration for a driver to get out of the vehicle and stepwise alarm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle burglar alarm system which detects an intruder in a vehicle and issues an alarm.

[0002]

2. Description of the Related Art As a conventional vehicle burglar alarm device, a device using the Doppler effect of ultrasonic waves or radio waves is known. In the former, an ultrasonic transducer is installed in the vehicle, the Doppler component contained in the reflected wave from the window glass etc. is detected, and the frequency shift caused by the intruder or the door movement into the vehicle is detected. The alarm is issued mainly to detect vibration of glass or a vehicle body or glass breakage. In the latter case, a radio wave generator is installed in a vehicle, and the movement of the conductor is detected in a similar manner.

[0003]

However, in the case of an ultrasonic sensor, when a window is closed, a moving object outside the vehicle cannot be detected, and an alarm is issued only when the vehicle is damaged or invaded. And thus lacks the deterrent effect.

On the other hand, a conventional vehicle theft alarm system using a radio wave Doppler sensor detects the reflection from a conductor within a certain detection range. Therefore, when the detection range does not match the size of the vehicle, For example, if the detection range is limited to the inside of the vehicle, only the same effect as that of the ultrasonic sensor can be expected, and if the detection range is wide and extends outside the vehicle, there is a risk that even a general pedestrian may issue an alarm. Was.

[0005] Further, when the driver gets on the vehicle, or even when a person is temporarily approaching, a warning is issued at the same level as an intruder, so that the location and time for operating the device are limited. there were.

The present invention solves the above-mentioned problems, and provides a vehicle burglar alarm device that can detect a moving object outside the vehicle within an appropriate range even when the window is closed, and can change the alarm step by step. It is intended to be.

[0007]

In order to solve the above-mentioned problems, a radio wave generator of a vehicle burglar alarm system according to the present invention includes a volume switch capable of adjusting a detection range, and the alarm device controls the start of operation. In addition, a timer circuit capable of changing the alarm signal according to the duration of the moving object detection signal is additionally provided.

A radio wave Doppler sensor for detecting the presence or absence of a moving object by receiving a reflected wave of a radio wave emitted from a radio wave generator is installed in a vehicle interior, and an output device using sound as an alarm signal is installed in a hood. I do. The volume switch is set so that the response range can be appropriately changed in accordance with the size of the vehicle, centering on the antenna provided in the sensor.

The timer circuit provides a waiting time for the driver to leave the vehicle, and is then used to enter an alert state and to provide a step-by-step alarm. For example, an initial alert state when a person approaches a vehicle and a threat alert state when the state exceeds a set time can be set.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram of the vehicle burglar alarm device. The radio wave emitted from the radio wave generator 1 is supplied to the detector 3 via the antenna 2. If there is a moving object, the frequency of the reflected wave is different from the original frequency. Therefore, the difference in the frequency is detected by the comparator 4, and the alarm is output while controlling the alarm output unit 6 through the timer circuit 5. appear.

The antenna 2 includes a metal rod, a coil, a lead wire,
Alternatively, it may be a copper foil on a circuit wiring board. As the alarm output device 6, an alarm disposed in a hood, an LED or a lamp provided in a sensor body in a room, or the like is applied. Since the alarm is installed in the engine room of the hood, it is desirable to use a battery as a power source for these vehicle theft alarm devices. On the other hand, the sensor body is set at the center of the dashboard where the antenna stands upright.

When the power switch of the sensor body is turned on when getting off the car, the timer circuit 5 is set to start its operation after, for example, 40 seconds. The volume switch provided on the sensor body is centered on the antenna as shown in FIG. 2, and is set to 70 cm for volume (LO) and 1.
The reaction range can be changed to 5 m. As a result, it is possible to set a reaction range outside the vehicle and not responding to ordinary pedestrians.

Next, as a step alarm, for example, when a person approaches a car, a short and intermittent warning sound is generated in accordance with the movement of the person, and at the same time, a threatening LED provided on the sensor is blinked. If this state continues even after the elapse of 40 seconds, the alarm is set to be a continuous sound of 110 dB and to continue sounding for 20 seconds. Accordingly, when the driver gets on the vehicle or when there is only a person who is temporarily approaching, only a slight warning sound can be used, and it is possible to make it difficult for anyone other than the person concerned to notice. Therefore, the device can be turned on at night or in a place where there are many pedestrians. Also, even when a suspicious person approaches, monitoring and warning at an early stage can prevent a car from being damaged or the like.

[0014]

As described above, the vehicle burglar alarm system of the present invention includes the volume switch of the detection range, so that the detection range can be adapted to the size of each vehicle. The alarm is equipped with a timer circuit so that when the driver gets on and off the vehicle, it can control the start of operation and the operation status. And can change the alarm signal.

[Brief description of the drawings]

FIG. 1 is a block diagram of a vehicle burglar alarm device.

FIG. 2 is an explanatory diagram showing a reaction range.

[Explanation of symbols]

 1 Radio wave generator 2 Antenna 5 Timer circuit 6 Alarm output device

Claims (1)

[Claims] A vehicle having a radio wave Doppler sensor for detecting the presence or absence of a moving object by receiving a reflected wave of a radio wave emitted from a radio wave generator, and an alarm device for outputting an alarm signal when a moving object is present. In the theft alarm device, the radio wave generator includes a volume switch capable of adjusting a detection range, and the alarm device controls a start time of its operation and can change an alarm signal according to a duration of a moving object detection signal. A vehicle burglar alarm device characterized by being provided with: