JP2003019947A - Car break theft alarm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reliable car break theft alarm which is free from generation of mistaken alarm caused by popcorn noise of an infrared ray sensor. SOLUTION: A microcomputer 17 provided on a master unit 1 flashes a light emitting diode 8 of a light emission unit 9 as a preliminary alarm output when the first detection pulse is input from an infrared ray sensor 5 of the master unit 1 or an infrared ray sensor 14 of a slave unit 2, and controls a buzzer circuit 33 to give a small buzzer sound. When three detection pulses are input continuously within five seconds, or at least one detection pulse is input from the infrared ray sensors 5 and 14, the microcomputer 17 flashes the light emitting diode 8, and switches the alarm output to the main alarm for giving a large buzzer sound.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an onboard alarm device using an infrared sensor.

[0002]

2. Description of the Related Art Conventionally, there is an on-board burglar alarm that detects an intruder into a vehicle by using an infrared sensor including a pyroelectric sensor and issues an alarm to prevent the on-board theft.

[0003]

An infrared sensor using the above pyroelectric sensor has a problem that an output is generated by so-called popcorn noise. Therefore, in the manufacturing process of the infrared sensor, a temperature condition in which popcorn noise is likely to occur is set. Although all the infrared sensors are set and inspected, it is very difficult to sort them out.Therefore, when the infrared sensor is used for the above-mentioned on-board burglar alarm, a false alarm due to popcorn noise occurs. There was a problem.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a highly reliable on-board burglar alarm which does not cause false alarm due to popcorn noise of the infrared sensor.

[0005]

In order to achieve the above-mentioned object, according to the invention of claim 1, a master unit provided with an infrared sensor for outputting a detection pulse in response to a predetermined change in the amount of infrared light received. And a slave unit, which is provided in the master unit, performs signal processing of a detection pulse output from the infrared sensor of the master unit and the slave unit, and the first infrared sensor from any one of the master unit and the slave unit. When a detection pulse is input, a preliminary alarm is output, and when a predetermined number or more of detection pulses are input within a fixed time after the preliminary alarm is output, a signal processing means for switching the alarm output from the preliminary alarm to the main alarm is provided. And

According to a second aspect of the present invention, in the first aspect of the present invention, if the signal processing means does not receive the predetermined number of detection pulses within the predetermined time, the output of the preliminary alarm is stopped, The present invention is characterized in that it has a function of outputting this alarm when there are a predetermined number or more of detection pulses within a predetermined time after the output of the preliminary alarm is stopped.

According to a third aspect of the invention, in the first or second aspect of the invention, the infrared rays of the master unit and the slave unit are input to the signal processing means within a certain time after the first detection pulse is input. When one or more detection pulses are input from each sensor, the alarm output is switched from the preliminary alarm to the main alarm.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to embodiments.

As shown in FIG. 3, the on-board theft alarm device of this embodiment is composed of a master device 1, a slave device 2, and a remote control transmitter 3 for operating turning on / off of a warning. The master unit 1 has a flat rectangular parallelepiped body 4 with a built-in circuit that constitutes the signal processing means shown in FIG. 1, and a pyroelectric element and a detection signal amplification section to be built in the center of the front surface of the body 4. The light receiving portion 5a of the infrared sensor 5 (see FIG. 1) configured by is exposed. Further, a light receiving portion 6a of a remote control receiving circuit 6 (see FIG. 1) that receives a remote control signal from a remote control transmitter 3 using infrared rays as a signal medium faces the side. A plurality of light emitting diodes 8 ... (See FIG. 1) are arranged in a horizontal row on the front surface of the body 4 below the light receiving portions 5a and 6a.
Is provided.

On the upper part of the body 4, a wire spring material is bent into a substantially U shape, and both ends, that is, the rear ends thereof are fixed to the rear part of the body 4, and the front end is elastically contacted with the upper surface of the body 4. Elastic attachment 1 with the tip positioned near the upper surface of the front of the body 4 in the state
0 is set. This elastic attachment 10 is for attaching the body 4 of the parent device 1 to the sun visor 11 as shown in FIG. 4. For example, the edge of the sun visor 11 on the passenger seat 12 side on the windshield side is elastically attached. By inserting between the elastic attachment 10 and the upper surface of the body 4 from the front side of 10 and sandwiching between the elastic attachment 10 and the upper surface of the body 4 by the elastic force of the elastic attachment 10, The body 4 is attached to the sun visor 11.

By this attachment, the detection axis direction of the light receiving portion 5a of the infrared sensor 5 provided on the front surface of the body 4 is directed rearward in the vehicle, and the hatchback can be put in the detection area even in a hatchback vehicle. become.

On the other hand, the handset unit 2 has an infrared sensor 14 having a pyroelectric sensor and an amplifier for amplifying a detection signal in a body 13.
(See FIG. 1) is built in, and the light receiving portion 14 of the infrared sensor 14
a is faced to the downwardly inclined surface formed on the lower front surface of the body 13. The detection signal line 15 of the infrared sensor 14
So that it can be connected to the signal processing means in the master device 1 by detachably connecting a harness plug (not shown) provided at the tip to a connector 16 (see FIG. 1) provided in the master device 1. Has become.

The child device 2 is the side corresponding to the sun visor 11 to which the container body 2 of the parent device 1 is attached, and as described above, the passenger seat 1
If it is on the 2nd side, the center bracket 18 on the passenger seat 12 side is located at a position higher than the passenger seat 12 as shown in FIG.
It is attached using.

In FIG. 4, 20 is a driver's seat and 21 is a rear seat.

The signal processing means of the on-board theft alarm device according to the present embodiment is housed in the master device 1, and its configuration is shown in FIG.
As shown in.

That is, the signal processing means operates by using the secondary battery 26 built in the master device 1 as a power source, and is a central microcomputer (hereinafter referred to as a microcomputer) 1
7 and a charging circuit 28 for connecting a battery (not shown) mounted on a vehicle by a cigar plug 27 to power the battery to charge the secondary battery 26 under the control of the microcomputer 17 and the secondary battery 26. A constant voltage circuit 29 for stabilizing the voltage to a power supply voltage required by the microcomputer 17, and the microcomputer 1
An oscillator circuit 30 for giving a basic clock to 7, a reset circuit 31 for resetting the microcomputer 17 at the time of initial start and as necessary, an EEPROM 32 storing programs and data, and under the control of the microcomputer 17. Under the control of the buzzer circuit 33 for outputting a preliminary alarm or a main alarm to be described later, the input circuit 34 for inputting the detection output of the infrared sensor 14 of the slave unit 2 to the microcomputer 17, and the control of the microcomputer 17, The light-emitting diode 35 that indicates that the secondary battery 26 is out of capacity or is being charged, and the lighting of the secondary battery 26 are controlled by the control of the microcomputer 17, and are sequentially lit to display a warning, or blink as an output of a preliminary alarm or this alarm .. of the light emitting unit 9 and the like.

Here, the microcomputer 17 monitors the voltage of the secondary battery 36 to detect the remaining capacity of the battery, lights the light emitting diode 35 when the remaining capacity is low, and displays the battery exhaustion, and a charging circuit. And a charge control function of controlling whether or not the charging circuit 28 is connected to the battery and controlling the charging current of the charging circuit 28 based on the voltage of the secondary battery 26 when the charging circuit 28 is connected to the battery. It has at least a charge display function for controlling the light emission color and the lighting state of the light emitting diode 35 during the charging operation to display that the battery is being charged, and a signal processing function for an on-board theft alarm described later.

Next, the signal processing function of the microcomputer 17 of the present invention for theft alarm will be described with reference to the flowchart of FIG.

First, the microcomputer 17 normally operates the secondary battery 2
It is in standby mode with 6 as the power source.

When the vehicle is parked or stopped and the passenger leaves the vehicle, the remote control transmitter 3 is operated from outside the vehicle to send a remote control signal of the warning set to the light receiving portion 6a of the remote control receiving circuit 6 of the master device 1 inside the vehicle. When the remote control signal of the warning set is received and input through the remote control receiving circuit 6, the signal processing function of the theft alarm of the microcomputer 17 is activated and the system is turned on, and the infrared sensor 5 of the parent device 1 or the infrared ray of the child device 2 The operation of the warning mode in which the detection judgment of the intruder is performed based on the input of the detection pulse from the sensor 14, and at the same time, the lighting of the light emitting diodes 8 ... Is scanned to display the warning to the person outside the vehicle.

When the passenger returns to the vehicle and resets the warning mode, the remote control transmitter 3 sends a remote control signal for warning reset to the light receiving section 6a of the remote control receiving circuit 6 of the master device 1 in the vehicle. The microcomputer 17 receiving and inputting the remote control signal for warning reset through the remote control receiving circuit 6 returns the operation of the signal processing function of the theft alarm to the standby mode.

In the warning mode, the microcomputer 17 checks whether or not the detection pulse is input from the infrared sensors 5 and 14 of the parent device 1 and the child device 2, respectively. When the detection pulse is output from the above and is input to the microcomputer 17 (step S1), the scanning of the light emitting diodes 8 is stopped, each of them is blinked, and the buzzer circuit 33 is operated to emit a buzzer sound at a small volume level. Let it ring. That is, a preliminary alarm is output as an alarm output (step S2). The buzzer sound may not be issued.

After outputting this preliminary alarm, the microcomputer 17
Is a constant number (for example, 3) of detection pulses from any of the infrared sensors 5 and 14 within a fixed time (for example, 5 seconds).
Pulse) or more or both infrared sensors 5,14
It is monitored whether or not one or more detection pulses are input from (steps S3 and S3 ').

In the case of the above-mentioned popcorn noise, one or two pulses are generated from the infrared sensor 5 or 14, but the probability of simultaneous generation from both infrared sensors 5 and 14 is low. On the other hand, when the heat ray of the human body is detected, the infrared sensors 5 and 14 continuously output 5 to 10 detection pulses. For example, when the window glass of the door is broken and a human body enters the vehicle or there is a large temperature change in the vehicle due to opening and closing of the door, the infrared sensor 5 or 14 outputs 5 to 10 detection pulses. To be done. Further, in such a case, there is a high possibility that the detection pulses are simultaneously output from both infrared sensors 5 and 14, respectively.

Therefore, the microcomputer 17 inputs three detection pulses from one of the infrared sensors 5 and 14 within 5 seconds after the preliminary alarm is output, or detects one detection pulse from each of the infrared sensors 5 and 14 within 5 seconds. When the pulse is input,
The buzzer circuit 33 is controlled so that a buzzer sound is emitted at a volume level higher than the volume level at the time of the preliminary alarm and the light emitting diodes 8 ... Continue to blink. That is, the alarm output is switched from the preliminary alarm to the main alarm (step S4).
Then, an intruder threatened by a loud buzzer sound or blinking of the light-emitting diodes 8 ... Will escape, and as a result, the articles stored in the vehicle can be prevented from being stolen. Then, the signal processing function of the theft alarm of the microcomputer 17 continues the output of this alarm for a fixed time (for example, 60 seconds) and then stops (step S5), and returns to the operation in the warning mode.

On the other hand, if the pulse first input to the microcomputer 17 is popcorn noise from the infrared sensor 5 or 14, three or more detection pulses may be generated from these infrared sensors 5 and 14 within 5 seconds. Since 5 seconds have not elapsed, the microcomputer 17 stops the output of the preliminary alarm in step S6 after 5 seconds (step S6).

When the preliminary alarm output is stopped, the microcomputer 17
Continues to monitor whether or not a predetermined number (for example, 2 pulses) of detection pulses are input from the infrared sensors 5 and 14 within a fixed time (for example, 25 seconds) (step S7), and one or no detection pulse is input. If not, the operation returns to the warning mode.

On the other hand, when two detection pulses are input to the microcomputer 17 within 25 seconds, the light emitting diodes 8 ...
Controls and makes a buzzer sound at a high volume level.
That is, this alarm is output (step S8). This alarm output is continued for 60 seconds as described above and then stopped (step S9), and the operation returns to the warning mode.

As described above, even if a detection pulse is input to the microcomputer 17 from the infrared sensor 5 provided in the master unit 1 or the infrared sensor 14 provided in the slave unit 2, the microcomputer 17 does not immediately output this alarm and the standby state An alarm is output once, and then a predetermined number of detection pulses are input from the infrared sensors 5, 14 at a fixed time, or both infrared sensors 5, 14 are input.
By providing a process to judge whether the detection pulse is input from, the false alarm due to the pulse due to popcorn noise or the transient pulse is prevented, and the annoyance to the surroundings due to the false alarm is prevented.

On the other hand, when the intruder hides behind the door and opens the door, one or two detection pulses from the infrared sensors 5 and 14 which detect the change in the infrared ray amount when the door is opened and closed. Although it is input to the microcomputer 17, the detection pulse is indistinguishable from popcorn noise by the one or two detection pulses.
By monitoring by, the popcorn noise and the detection pulse by the intruder can be distinguished, and therefore, the intruder can be reliably detected while preventing false alarm due to the popcorn noise.

[0031]

According to the first aspect of the present invention, a master unit and a slave unit each provided with an infrared sensor that outputs a detection pulse corresponding to a predetermined change in the amount of received infrared rays, and the master unit are provided.
Signal processing of the detection pulse output from the infrared sensor of the parent device and the child device, when a first detection pulse is input from the infrared sensor of any of the parent device and the child device, a preliminary alarm is output, Since a signal processing means for switching the alarm output from the preliminary alarm to the main alarm when a predetermined number or more of detection pulses are input within a predetermined time after the preliminary alarm output is provided,
Even if an intruder hides behind the door and opens the door, a fixed number of detection pulses from the infrared sensor generated by the opening of the door and detection pulses from the infrared sensor due to popcorn noise are detected following the signal processing means. It can be distinguished by whether or not a pulse is input, so that it does not disturb the surroundings by false alarm due to popcorn noise, and can reliably detect the intruder as described above and output this alarm. As a result, there is an effect that a highly reliable on-board burglar alarm can be provided.

According to a second aspect of the present invention, in the first aspect of the invention, if the signal processing means does not input the predetermined number of detection pulses within the predetermined time, the output of the preliminary alarm is stopped, and In addition to the effect of the invention of claim 1, when the number of detection pulses of a predetermined number or more is detected within a predetermined time after the output of the preliminary alarm is stopped, the function of outputting the present alarm is provided. There is an effect that even an intruder who has intruded can be reliably detected and an alarm can be issued.

According to a third aspect of the present invention, in the first or second aspect of the invention, each of the infrared sensors of the master unit and the slave unit within the fixed time after the first detection pulse is input to the signal processing means. In addition to the invention of claim 1 or 2, the alarm output is switched from the preliminary alarm to the main alarm when one or more detection pulses are respectively input from If there is a detection pulse from both infrared sensors, this alarm can be promptly output, and the effect of preventing theft is high.

[Brief description of drawings]

FIG. 1 is a block diagram showing a system configuration of an embodiment of the present invention.

FIG. 2 is a flowchart for explaining the same operation as above.

FIG. 3 is a perspective view of the above.

[Fig. 4] Fig. 4 is a configuration diagram of an in-vehicle arrangement of the same as above.

[Explanation of symbols]

1 parent device 2 child devices 5 infrared sensor 8 light emitting diodes 9 Light emitting part 14 Infrared sensor 17 Microcomputer 33 Buzzer circuit

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Claims (3)

[Claims] 1. A master unit and a slave unit each equipped with an infrared sensor that outputs a detection pulse in response to a change in the amount of infrared rays received, and a master unit and a slave unit provided in the master unit. Performs signal processing of the detection pulse output from the infrared sensor, outputs a preliminary alarm when the first detection pulse is input from any of the infrared sensors of the parent device and the child device, and outputs a preliminary alarm within a fixed time after the preliminary alarm is output. An on-board burglar alarm, comprising signal processing means for switching the alarm output from the preliminary alarm to the main alarm when a certain number or more of detection pulses are input. 2. The signal processing means stops the output of the preliminary alarm if the fixed number of detection pulses is not input within the fixed time, and outputs a predetermined number within a predetermined time after stopping the output of the preliminary alarm. The on-board theft alarm device according to claim 1, further comprising a function of outputting this alarm when the above detection pulse is present. 3. An alarm output is output to the signal processing means when one or more detection pulses are input from the infrared sensors of the master unit and the slave unit within the fixed time after the first detection pulse is input. The on-board burglar alarm according to claim 1 or 2, further comprising a function of switching from a preliminary alarm to a main alarm.