JP2010126032A - Mobile object detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile object detector capable of improving the detection accuracy of a mobile object. <P>SOLUTION: The mobile object detector 10 for detecting the movement of an object in a cabin to be monitored comprises an acceleration sensor unit 15 for detecting the vibration of a vehicle, a mobile object detection unit 11 for detecting the movement of the mobile object in the cabin, and a control unit 20 for starting the detection of the movement of the object by the mobile object detection unit 11 when the impact level detected by the acceleration sensor unit 15 is equal to or higher than a predetermined value. When the vibration level detected by the acceleration sensor unit 15 is equal to or higher than a predetermined value, the possibility is high that the external force is applied to the vehicle by a human means, and therefore the detection accuracy of the mobile object detector 10 can be improved by starting the movement detection of the object by the mobile object detection unit 11. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a moving body detection device that detects movement of a moving body in a space to be monitored.

  The moving body detection device is installed, for example, in a vehicle, a house, or the like, and has a mechanism for detecting the movement of an intruder in a vehicle interior or interior and sounding an alarm (for example, see Patent Document 1).

JP 2004-142660 A

  However, when the moving body detection device is installed in a vehicle, it is detected that the intruder has accidentally entered the room other than when the intruder has entered the room due to disturbance factors such as vibration applied to the vehicle and surrounding sounds. There was a case.

  This invention is made | formed in view of the said situation, and it aims at providing the mobile body detection apparatus which improved the detection precision of the mobile body.

In order to achieve such an object, the mobile body detection device of the present invention is a mobile body detection device that detects the movement of an object in a vehicle interior to be monitored, and an impact detection means that detects an impact applied to the vehicle, A moving body detecting means for detecting movement of an object in a vehicle interior, and a control for enabling movement detection of the object by the moving body detecting means when an impact detected by the impact detecting means is equal to or higher than a predetermined level. Means.
When the vibration level detected by the impact detection means is equal to or higher than the predetermined level, there is a high possibility that an external force is applied to the vehicle by human means. Thus, it is possible to improve the accuracy of object movement detection by the moving body detection means.

In the above moving body detection device, the control means preferably supplies power to the moving body detection means and starts detecting the movement of an object when the impact detected by the impact detection means is equal to or higher than a predetermined level. It is good to let them.
Accordingly, since the movement detection of the object is started after the vibration applied to the vehicle is detected by the impact detection means, the power consumption of the moving body detection means can be reduced.

In the moving body detection apparatus, the control means preferably has a signal level of a sensor signal measured by the impact detection means that is not more than a first threshold value, and a signal of the sensor signal measured by the moving body detection means. It may be determined that the movement of the object is detected when the level is equal to or higher than the second threshold value.
Accordingly, it is possible to accurately detect the movement of the object in the monitored vehicle interior.

In the mobile body detection device, the impact detection unit and the mobile body detection unit are preferably housed in the same casing.
Therefore, it is possible to detect a shake in the vicinity of the installation site of the mobile object detection device. Moreover, compared with the case where a mobile body detection apparatus and a vibration detection apparatus are provided separately, apparatus cost can be reduced. Further, by providing the impact detection means and the moving body detection means in the same housing, it is possible to reduce signal wiring and make it less susceptible to noise and the like.

A moving body detection device according to the present invention is a moving body detection device that detects movement of an object in a vehicle interior to be monitored, and includes an impact detection means that detects an impact applied to the vehicle, and an object movement in the vehicle interior. The signal level of the sensor signal measured by the moving body detecting means and the impact detecting means is less than or equal to the first threshold value, and the signal level of the sensor signal measured by the moving body detecting means is the second threshold. When the value is equal to or greater than the value, the determination unit determines that the movement of the object has been detected.
Therefore, it is possible to accurately detect the movement of the moving body in the vehicle interior to be monitored.

  ADVANTAGE OF THE INVENTION According to this invention, the movement detection precision of the object in the vehicle interior of the monitoring object can be improved.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS The best embodiment of the present invention will be described below with reference to the accompanying drawings.

First, the configuration of the moving object detection apparatus will be described with reference to FIG.
As shown in FIG. 1, the present embodiment includes a configuration in which a power source unit 19 and an alarm device 30 are connected to a moving body detection device 10. The power supply unit 19 supplies power to the moving object detection device 10. FIG. 1 shows only the power supply line through which the power supply unit 19 supplies power to the moving object detection unit 11 and the acceleration sensor unit 15 (details of these functional units will be described later). Supplies power to other functional units (for example, the control unit 20 shown in FIG. 1). The moving body detection device 10 activates the alarm device 30 by detecting the movement of the moving body in the vehicle interior to be monitored. The alarm device 30 is connected to the moving object detection device 10 and performs an alarm operation according to the object movement detection signal output from the moving object detection device 10.

  As shown in FIG. 1, the moving body detection device 10 includes a moving body detection unit 11, a first waveform processing unit 12, a first filter unit 13, a switch unit 14, an acceleration sensor unit 15, and a second waveform processing. The unit 16, the second filter unit 17, the switch unit 18, and the control unit 20 are included. In particular, in this embodiment, an acceleration sensor unit 15 is provided in the moving body detection apparatus 10 as shown in FIG.

The moving body detection unit 11 functions as a sensor that detects a moving body, and transmits a radio wave for detecting a moving body into the vehicle interior to detect the movement of an object in the vehicle interior.
FIG. 2 shows the configuration of the moving object detection unit 11. As shown in FIG. 2, the moving body detection unit 11 includes an oscillation unit 111 and a reception unit 113. The transmission wave output from the oscillating unit 111 is irradiated from the transmission antenna 112 into the vehicle interior. The transmission wave irradiated by the transmission antenna 112 is reflected in the vehicle interior, and the reflected wave reflected is received by the reception antenna 114. The receiving unit 113 mixes the transmission wave and the reception wave, and generates a sensor signal indicating the phase difference between these signals. The sensor signal generated by the receiving unit 113 is output to the first waveform processing unit 12.
In addition, the structure of the mobile body detection part 11 is not limited to what is shown in FIG. 2, What is necessary is just a structure which can detect a mobile body. Further, the radio wave may be a radio wave generally used for detecting movement of an object such as a microwave, a millimeter wave, and an infrared ray.

The first waveform processing unit 12 inputs a sensor signal output from the moving body detection unit 11. The first waveform processing unit 12 adjusts the output timing of the sensor signal to the first filter unit 13 so that the input sensor signal is smoothly processed by the first filter unit 13 at the subsequent stage.
The first filter unit 13 performs a filter process on the sensor signal acquired from the first waveform processing unit 12 and outputs a sensor signal in a predetermined band to the control unit 20. For example, a sensor signal of 20 Hz to 50 Hz is extracted by the first filter unit 13 and output to the control unit 20.

  The acceleration sensor unit 15 is provided as a sensor for detecting vibration (impact detection means of the present invention). The vibration of the moving body detection device 10 itself is detected, and a sensor signal indicating the detected value is output to the second waveform processing unit 16. The sensor used for detecting the acceleration in the acceleration sensor unit 15 is, for example, a sensor that converts a physical effect amount such as a capacitance type or a piezoresistive type corresponding to the acceleration into an analog voltage and outputs the analog voltage. It is done.

The second waveform processing unit 16 inputs a sensor signal output from the acceleration sensor unit 15. The second waveform processing unit 16 adjusts the output timing of the sensor signal to the second filter unit 17 so that the input sensor signal is smoothly processed by the second filter unit 17 at the subsequent stage.
The second filter unit 17 filters the output signal of the second waveform processing unit 16 and outputs a sensor signal in a predetermined band to the control unit 20.

  The switch units 14 and 18 turn the power supply to the moving body detection unit 11 and the acceleration sensor unit 15 on and off, respectively, according to the control of the control unit 20.

The control unit (corresponding to the control unit and the determination unit of the present invention) 20 is a sensor signal detected by the moving body detection unit 11 and subjected to signal processing by the first waveform processing unit 12 and the first filter unit 13, and an acceleration sensor. The sensor signal measured by the unit 15 and subjected to signal processing by the second waveform processing unit 16 and the second filter unit 17 is input.
Based on the sensor signal indicating the detection result of the input moving body detection unit 11 and the sensor signal indicating the measurement result of the acceleration sensor unit 15, the control unit 20 determines whether or not there is an object movement in the monitored vehicle interior. Judgment processing is performed to determine whether or not. Details of the determination process will be described later with reference to a flowchart. When it is determined by the determination process that the object has moved in the vehicle interior, the control unit 20 outputs an object movement detection signal to the alarm device 30 and performs an alarm operation.
Further, the control unit 20 enables the movement detection of the object by the moving body detection unit 11 or starts the movement detection of the object by the moving body detection unit 11 according to the impact level detected by the acceleration sensor unit 15. . Therefore, the control unit 20 controls the switch unit 14 to switch on and off the power supplied to the moving body detection unit 11.

FIG. 3 shows a hardware configuration of the control unit 20. The control unit 20 includes a central processing unit (CPU) 21, a read only memory (ROM) 22, a random access memory (RAM) 23, and an input / output unit 24. These devices are connected via a bus. ing.
First, the CPU 21 reads the control program recorded in the ROM 22 and develops it in the RAM 23. Then, the CPU 21 performs a process (for example, the above-described determination process) on the sensor signal or the like input from the input / output unit 24 according to the control program developed in the RAM 23. Further, when the movement of the object is detected in the vehicle interior by the determination process, an object movement detection signal is output from the input / output unit 24 to the alarm device 30.

In FIG. 4, an example of arrangement | positioning in the vehicle interior of the mobile body detection apparatus 10 is shown.
For example, as shown in FIG.

  As shown in FIG. 1, the moving body detection device 10 of this embodiment includes an acceleration sensor unit 15, that is, an acceleration sensor (impact detection means) in the moving body detection device 10. By determining whether or not the moving body detection device 10 itself vibrates by the acceleration sensor unit 15, the accuracy of the movement detection of the object by the moving body detection unit 11 is improved.

For example, when vibrations or shocks caused by lightning, aircraft, motorcycles, construction sites, or the like are transmitted to the vehicle, both the acceleration sensor unit 15 and the moving body detection unit 11 detect the vibrations and shocks. Therefore, when the sensor signal of the moving body detection unit 11 exceeds the predetermined threshold value, if the sensor signal of the acceleration sensor unit 15 also exceeds the predetermined threshold value, it is not the detection of the movement of the object. It is determined that vibrations and shocks caused by lightning, aircraft, motorcycles, construction sites, etc. are transmitted to the vehicle.
In FIG. 5, the waveform of the sensor signal at the time of measuring a rain sound with the acceleration sensor part 15 and the mobile body detection part 11 is shown. FIG. 6 shows waveforms of sensor signals measured by the acceleration sensor unit 15 and the moving body detection unit 11 when the aircraft passes over the vehicle. FIG. 7 shows waveforms of sensor signals measured by the acceleration sensor unit 15 and the moving body detection unit 11 when a motorcycle passes around the vehicle.

In addition, criminals, such as car theft and aiming on the vehicle, are subjected to strong impact on the window glass and door keys of the vehicle and damaged them, and then boarded in the vehicle or put their hands in the vehicle. Take away the goods. In such a case, first, a strong impact or vibration is first detected by the acceleration sensor unit 15, and then the movement of the object (such as an intruder or an intruder's arm) is detected by the moving body detection unit 11.
Therefore, in this embodiment, first, the acceleration sensor unit 15 is used to detect an impact or vibration applied to the vehicle. By comparing the sensor signal measured by the acceleration sensor unit 15 with a predetermined threshold value (predetermined level according to claim 1, hereinafter referred to as a third threshold value), the vehicle is subjected to shock and vibration. It is determined whether or not is added. For example, 0.5 g (= 0.5 × 9.8 m / S ² ) is used for the third threshold value. At this time, power is not supplied to the moving body detection unit 11 and the moving body detection unit 11 is turned off. FIG. 8 shows the waveforms of sensor signals measured by the acceleration sensor unit 15 and the moving body detection unit 11 when the glass is struck with an instrument called a striker.

  When the impact or vibration is detected by the sensor signal measured by the acceleration sensor unit 15, the control unit 20 turns on the power supply to the moving body detection unit 11, and the vehicle of the object (the intruder or the intruder's arm) is turned on. Enable (or initiate) indoor object movement detection. In recent years, criminal techniques have become more sophisticated, and when window glass is destroyed after pasting gum tape or the like on window glass or the like, window glass breakage is accurately detected only from the sensor signal of acceleration sensor unit 15. I can't do it. Further, even when a smoke film or the like is bonded to the window glass, it is not possible to accurately detect the window glass crack only from the sensor signal of the acceleration sensor unit 15. Therefore, since it is certain that the vehicle has been subjected to an impact or vibration by the sensor signal measured by the acceleration sensor unit 15, the control unit 20 turns on the power supply to the moving body detecting unit 11, and moves the moving body. The detection of the moving body in the vehicle interior by the detection unit 11 is started.

When the power supply to the moving body detection unit 11 is turned on, the control unit 20 detects intrusion of an object into the vehicle interior based on sensor signals measured by the moving body detection unit 11 and the acceleration sensor unit 15. The signal level of the sensor signal measured by the acceleration sensor unit 15 is larger than a preset threshold value (hereinafter referred to as a first threshold value (corresponding to the first threshold value of the present invention)), and When the signal level of the sensor signal measured by the moving body detection unit 11 is equal to or higher than a preset threshold value (hereinafter referred to as a second threshold value (corresponding to the second threshold value of the present invention)), The control unit 20 determines that the vibration or impact caused by the above-described lightning, aircraft, motorcycle, construction site, or the like has been transmitted to the vehicle, and does not output an object movement detection signal to the alarm device 30.
Further, the signal level of the sensor signal measured by the acceleration sensor unit 15 is equal to or lower than a first threshold value set in advance, and the signal level of the sensor signal measured by the moving body detection unit 11 is equal to or higher than the second threshold value. In some cases, the control unit 20 determines that the moving body detection unit 11 has detected the movement of an object (such as an intruder or an intruder's arm) that has entered the vehicle interior. In this case, the control unit 20 outputs an object movement detection signal to the alarm device 30, operates the alarm device 30, and performs an alarm operation.
FIG. 9 shows the waveform of the sensor signal measured by the moving body detection unit 11 and the acceleration sensor unit 15 when the object placed in the passenger compartment is taken out from the window. As shown in FIG. 9, vibration cannot be detected from the sensor signal measured by the acceleration sensor unit 15, but the movement of the object is detected from the sensor signal measured by the moving body detection unit 11.
In this description, the first threshold value used when it is determined that there is an object moving in the vehicle interior and when it is determined that there is no object is the same value, but these values are set to different values. May be.
Further, the second threshold value used for the sensor signal of the moving body detection unit 11 is a threshold value when the movement of the object is detected using only the moving body detection unit 11, that is, the moving body detection sensor. The value can be set smaller than. Since it is known from the sensor signal measured by the acceleration sensor unit 15 that vibration or impact has been applied to the vehicle, the second threshold value is set to a small value and the value output from the moving body detection unit 11 Even if the sensor signal is small, it is determined as abnormal.
Further, the output range of the transmission radio wave output from the transmission antenna 112 of the moving body detection unit 11 may be monitored from a range slightly outside the vehicle body. As described above, since it is known that a vibration or impact is applied to the vehicle by the sensor signal measured by the acceleration sensor unit 15, there is a possibility that there is a person near the vehicle body, and this can be detected with high accuracy. Like that.

Next, the processing procedure of the control unit 20 will be described with reference to the flowchart shown in FIG.
When the ignition key is turned off and the vehicle door is locked, the control unit 20 turns on the switch unit 18 to supply power to the acceleration sensor unit 15. Next, the control unit 20 determines whether or not the vehicle door is unlocked. When the door is not unlocked (step S3 / NO), the control unit 20 inputs and analyzes the sensor signal measured by the acceleration sensor unit 15 (step S4).
The control unit 20 compares the signal level of the sensor signal output from the acceleration sensor unit 15 with a preset third threshold value, and determines whether or not the signal level of the sensor signal exceeds the third threshold value. Determine (step S5). When the signal level of the sensor signal is smaller than the third threshold value (step S5 / NO), the control unit 20 determines again whether the door is unlocked (step S3), and the door is locked. If so (step S3 / NO), the sensor signal measured by the acceleration sensor unit 15 is input and analyzed (step S4).
When the signal level of the sensor signal is equal to or higher than the third threshold value (step S5 / YES), the control unit 20 turns on the switch unit 14 and supplies power to the moving body detection unit 11 ( Step S6). And the control part 20 inputs the sensor signal which the acceleration sensor part 15 and the mobile body detection part 11 measure (step S7).

In the control unit 20, the signal level of the sensor signal measured by the acceleration sensor unit 15 is equal to or lower than the first threshold value, and the signal level of the sensor signal measured by the moving body detection unit 11 is equal to or higher than the second threshold value. It is determined whether or not (step S8).
When the signal level of the sensor signal output from the acceleration sensor unit 15 is higher than the first threshold value, or when the signal level of the sensor signal output from the moving body detection unit 11 is lower than the second threshold value ( In step S8 / NO), the control unit 20 determines that the acceleration sensor unit 15 has reacted due to vibration or impact caused by lightning, aircraft, construction, or the like, and determines that there is no abnormality. In this case, the control unit 20 determines whether or not a preset analysis time has elapsed (step S10). If the analysis time has elapsed (step S10 / YES), the switch unit 14 is turned off. Then, the power supply to the moving body detection unit 11 is turned off. Then, the control part 20 returns to the process of step S3, and determines whether the lock | rock of the door was cancelled | released (step S3).
If the analysis time has not elapsed (step S10 / NO), the control unit 20 inputs again the sensor signals measured by the acceleration sensor unit 15 and the moving body detection unit 11 (step S7). Then, the control unit 20 compares the sensor signal measured by the acceleration sensor unit 15 with the first threshold value, and compares the sensor signal measured by the moving body detection unit 11 with the second threshold value (step S8). ). When the signal level of the sensor signal measured by the acceleration sensor unit 15 is less than or equal to the first threshold value and the signal level of the sensor signal measured by the moving body detection unit 11 is greater than or equal to the second threshold value (Step S8 / YES), the control unit 20 determines that the movement of the object in the passenger compartment is detected. When the control unit 20 detects the movement of the object in the vehicle interior, the control unit 20 outputs an object movement detection signal to the alarm device 30 and issues an alarm by the alarm device 30. The alarm device 30 performs an alarm operation by outputting a loud buzzer sound from a speaker, for example. In addition, for example, a call may be made by calling a mobile phone owned by the owner of the vehicle, or a reporting operation to a security company or the like may be performed.

The third threshold value may be corrected according to the vehicle type. For example, the third threshold value is set to a small value in a high-end vehicle having rigidity, and the third threshold value is set to a large value in a popular car having little rigidity. The first, second, and third threshold values are written in a non-volatile memory (not shown) of the control unit 20.
Further, the third threshold value may be changed according to the user's preference. For example, when the user feels that the number of erroneous detections is large, the user goes to a dealer or the like and rewrites the third threshold value using a tool prepared for the dealer or the like.
Further, in the above-described flow, the transition to the monitoring state and the transition to the non-monitoring state are performed based on the locking and unlocking of the door, but this is merely an example. For example, when a dedicated signal instructing state transition is sent from a portable device that operates the door lock, unlock, etc. of the vehicle, switching between the monitoring state in the vehicle interior and the non-monitoring state may be performed. .

In this embodiment, when the vibration level detected by the acceleration sensor unit 15 is equal to or higher than a predetermined level, it is determined that there is a high possibility that an external force has been applied to the vehicle by human means, and the vehicle by the moving body detection unit 11 By starting the detection of the movement of the object in the room, the movement of the object in the vehicle interior can be accurately detected by the moving body detection unit 11.
In this embodiment, since the acceleration sensor unit 15 detects the vibration of the vehicle and then supplies power to the moving body detection unit 11 to start detecting the movement of the object in the vehicle interior, the power consumption is large. It is not necessary to always turn on the moving body detection unit 11. For this reason, power consumption can be reduced.
In this embodiment, since the acceleration sensor unit 15 and the moving body detection unit 11 are housed in the same casing, it is possible to detect a shake near the installation site of the moving body detection device 10. Moreover, compared with the case where the mobile body detection part 11 and the acceleration sensor part 15 are provided separately, apparatus cost can be reduced. In addition, since the acceleration sensor unit 15 and the moving body detection unit 11 are provided in the same housing, the signal wiring and the like can be reduced and the influence of noise or the like can be reduced.

The embodiment described above is a preferred embodiment of the present invention. However, the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention.
In the above-described embodiment, the monitoring target is described as the vehicle interior, but it may be “in the vehicle” including the inside of the trunk room or the engine room.

It is a block diagram which shows the structure of a moving body detection apparatus. It is a block diagram which shows the structure of a moving body detection part. It is a figure which shows the hardware constitutions of a control part. It is a figure which shows an example of the attachment position of a mobile body detection apparatus. It is a figure which shows the waveform of a sensor signal at the time of measuring rain sound with an acceleration sensor part and a mobile body detection part. It is a figure which shows the waveform of the sensor signal measured by an acceleration sensor part and a mobile body detection part when an aircraft passes over the head of a vehicle. It is a figure which shows the waveform of the sensor signal measured by an acceleration sensor part and a mobile body detection part, when a motorcycle passes the circumference | surroundings of a vehicle. It is a figure which shows the waveform of the sensor signal measured by an acceleration sensor part and a moving body detection part, when glass is struck with the instrument called a striker. It is a figure which shows the waveform of the sensor signal measured by a mobile body detection part and an acceleration sensor part, when extending what is put in the vehicle interior and taking a hand from a window. It is a flowchart which shows the process sequence of a control part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Moving body detection apparatus 11 Moving body detection part 12 1st waveform processing part 13 1st filter part 14, 18 Switch part 15 Acceleration sensor part 16 2nd waveform processing part 17 2nd filter part 19 Power supply part 20 Control part

Claims (5)

A moving body detection device for detecting movement of an object in a vehicle interior to be monitored,
An impact detection means for detecting an impact applied to the vehicle;
A moving body detecting means for detecting movement of an object in the passenger compartment;
When the impact detected by the impact detection means is equal to or higher than a predetermined level, a control means for enabling the movement detection of the object by the moving body detection means,
A moving body detection apparatus.   The moving body detection according to claim 1, wherein the control means supplies power to the moving body detection means to start movement detection of an object when an impact detected by the impact detection means is equal to or higher than a predetermined level. apparatus.   The control means is such that the signal level of the sensor signal measured by the impact detection means is less than or equal to a first threshold value, and the signal level of the sensor signal measured by the moving body detection means is greater than or equal to a second threshold value. The moving body detection apparatus according to claim 1, wherein in some cases, it is determined that the movement of the object is detected.   The mobile body detection device according to any one of claims 1 to 3, wherein the impact detection unit and the mobile body detection unit are housed in the same housing. A moving body detection device for detecting movement of an object in a vehicle interior to be monitored,
An impact detection means for detecting an impact applied to the vehicle;
A moving body detecting means for detecting movement of an object in the passenger compartment;
When the signal level of the sensor signal measured by the impact detection means is less than or equal to the first threshold value and the signal level of the sensor signal measured by the moving body detection means is greater than or equal to the second threshold value, Determination means for determining that movement has been detected;
A moving body detection apparatus.

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