JP5060153B2 - Vehicle door monitoring device and monitoring method - Google Patents

Description

  The present invention relates to a vehicle door monitoring apparatus and a monitoring method for monitoring air vibrations in a passenger compartment and determining whether or not a vehicle door has been opened.

  Conventionally, in order to prevent vandalism and theft of the vehicle, a monitoring device that monitors whether a window or a door has been opened, whether there is an intrusion, and detects an abnormality, and informs and threatens the information is detected. is there.

  Conventionally, various methods have been proposed as an abnormality detection method for this monitoring device. Japanese Patent Application Laid-Open No. 2004-151867 discloses a technique in which a predetermined frequency signal is transmitted to a vehicle interior by a speaker, a frequency signal in the vehicle interior is received by a microphone, and an intrusion into the vehicle is detected based on a phase shift amount. As a similar monitoring device using a speaker and a microphone, Patent Document 2 detects a change in sound pressure of multiple frequencies that occurs when a boundary of a window, a door, or the like changes when a sound field is formed in a closed space. There is something to do.

  Japanese Patent Laid-Open No. 2004-228561 detects an intruder by detecting a change in indoor air pressure using an atmospheric pressure sensor and further detecting infrared rays emitted from the intruder using an infrared sensor. 4 also includes a monitoring device that detects only with a microphone.

JP-A-6-239203 Japanese Patent Laid-Open No. 10-283577 JP-A-5-151470 JP 2001-93052 A

  The conventional monitoring apparatus described above has the following problems. That is, in the method of forming and detecting the sound field shown in Patent Documents 1 and 2, the sound pressure distribution is necessary when a sound source such as a speaker for forming the sound field is necessary or when there is luggage in the vehicle interior. If the change occurs, detection becomes difficult, and even if the door is opened, it may not be detected.

  Moreover, in the monitoring device that detects an intruder using an infrared sensor as in the technique disclosed in Patent Document 3, the detection sensitivity varies depending on the attachment position of the infrared sensor. Furthermore, in the technique disclosed in Patent Document 4, in order to monitor a situation in which a strong impact is applied to the vehicle body, when trying to detect a pressure fluctuation with a relatively short cycle, such as a truck that passes through the vicinity of the vehicle at high speed. There may be a case where the door is detected to be open due to pressure fluctuation, which may cause malfunction.

In order to solve the above problems, the present onset bright monitors the air vibration in the cabin, the vehicle door monitoring device determines whether the vehicle door is opened, measure the air vibration in the cabin constant, and a measuring unit for outputting the measured value, the negative pressure detecting means for outputting a negative圧識another signal when the measured value is lower than the first threshold value which is set by the constant Tsunene low, steady value the second positive pressure detecting means for measuring values against a threshold and outputs a positive圧識specific signal when high, each of the output timing and output time of the negative圧識specific signals and positive圧識specific signal which is set higher timing means for acquiring time information indicating an a determination means for the determination that the door is kicked open based on the total Tokijo report comprises, determining means, the output of the negative圧識specific signal first detected When a positive pressure identification signal is detected after the negative pressure identification signal, Output time of the issued negative圧識another signal, and, based on the output time of the detected positive圧識another signal after the negative圧識another signal, characterized by a determination that the door is kicked open .

In the vehicle door monitoring device according to the present invention , preferably, the determination means has an output time of the positive pressure identification signal detected after the negative pressure identification signal detected first is not less than a predetermined first determination time. , and the sum of the output time of the first output time of the detected negative圧識another signal to a detected after its negative圧識specific signal was positive圧識specific signal, when it is less than the second determination time, the door is you the judgment to the effect that has been kicked open.

In the vehicle door monitoring apparatus according to the present invention , preferably, the determination means detects the output of the positive pressure identification signal first, and when the negative pressure identification signal is detected after the positive pressure identification signal, The door is closed based on the output time of the positive pressure identification signal detected in step S3 and the output time of the negative pressure identification signal detected after the positive pressure identification signal .

The present onset bright monitors the air vibration in the cabin, in the monitoring method of determining a vehicle door monitor whether a door of the vehicle is opened, and measure the air vibration in the cabin, the measured value a measuring step of outputting a negative pressure detecting step of outputting a negative圧識another signal when the measured value is lower than the first threshold value which is set lower than the constant Tsunene, first is set higher than the constant Tsunene obtaining a positive pressure detecting step of outputting a positive圧識another signal when the measured value for the two thresholds is high, the time information indicating the respective output timing and output time of the negative圧識specific signals and positive圧識by signal comprising a timer step of the determining step of the determination that the door is kicked open based on the total Tokijo report, a determining step, the output of the negative圧識specific signal is first detected, its negative圧識by When a positive pressure identification signal is detected after the signal, the first negative pressure identification detected Output time of the item, and, based on the output time of the positive圧識specific signal detected after its negative圧識another signal, wherein the door is a process for the determination that has been kicked open.

5. The monitoring method for a vehicle door monitoring apparatus according to claim 4, wherein the determination step includes an output time of the positive pressure identification signal detected after the negative pressure identification signal detected first is equal to or longer than a predetermined first determination time. , and the sum of the output time of the first output time of the detected negative圧識another signal to a detected after its negative圧識specific signal was positive圧識specific signal, when it is less than the second determination time, the door is monitoring method for a vehicle door monitoring device, characterized in that the step of determining the effect that kicked open.

In the monitoring method of the vehicle door monitoring apparatus according to the present invention , preferably, the determination step is performed when the output of the positive pressure identification signal is first detected and the negative pressure identification signal is detected after the positive pressure identification signal. Is a process of determining that the door is closed based on the output time of the positive pressure identification signal detected first and the output time of the negative pressure identification signal detected after the positive pressure identification signal. There is .

  By using the present invention, it becomes a simple measuring means using a microphone that detects air vibration, and malfunction can be prevented by detecting that the door is opened based on the identification time and the pressure change history. . Furthermore, since it is only necessary to place it at a predetermined location in the vehicle interior, there is an effect that the installation work becomes easy.

  Hereinafter, embodiments of the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings.

  FIG. 1 shows the configuration of the vehicle door monitoring device. The vehicle door monitoring apparatus 100 includes a low-current-consumption one-chip microcomputer 10, a microphone 27, an amplifier 21 with a built-in low-pass filter for the microphone, a switch input 23, a display 24, a speaker 28, and a speaker. Amplifier 22 and a communication device 25 having an antenna 26. Further, the one-chip microcomputer 10 includes an A / D converter 15, a D / A converter 14, a ROM 11, a RAM 12, and a CPU 13 inside. Further, there is a remote controller 30 carried by the operator, and the remote controller has an antenna 31.

  What is characteristic in the present embodiment is that air vibration is detected as timed positive pressure and negative pressure, the timed information and pressure change are stored as a history for a predetermined period, and determined based on these. The door open etc. is determined more accurately.

  When the vehicle door monitoring device 100 detects a strong impact on the vehicle, door opening, or the like, a warning light provided on the display 24 or a speaker 28 is sounded, and the detected information is transmitted wirelessly. It is transmitted to the remote controller 30.

  The vehicle door monitoring device 100 is installed on a dashboard near the windshield or on a sun visor. The vehicle door monitoring device 100 is supplied with power by inserting a dedicated power plug into a cigarette lighter socket (not shown) and built-in. It can operate even when power is not supplied from the power plug by a battery (not shown).

  In order to reduce current consumption, the vehicle door monitoring apparatus 100 normally sets the microphone 27 and the amplifier 21 in the energized state, and sets the one-chip microcomputer 10 in the sleep state. Note that the amplifier 21 is set with a sleep release threshold value having a fluctuation range lower than first and second threshold values described later.

  When air vibration exceeding the sleep cancellation threshold is detected by the microphone 27 (hereinafter also referred to as a sensor), a sleep cancellation signal is sent from the amplifier 21 to the CPU 13 and the activated A / D converter 15 is activated. Thus, the waveform is taken into the CPU 13. Even when the CPU 13 is in the sleep state, for example, the sensor input is executed every 10 minutes to detect the sensor drift, and the steady value and the sleep release threshold value are corrected and set in the amplifier 21. At the same time, it is stored in the RAM 12.

  FIG. 2 shows an example of a waveform of a sensor output when the door is opened when the vehicle door monitoring device is installed in the passenger compartment where the door of the vehicle is closed. The horizontal axis of the sensor output waveform in FIG. 2 is time, and the vertical axis is the sensor output voltage. When the door is closed, there is almost no air vibration in the passenger compartment, and since the pressure is constant at a steady pressure, the output voltage from the microphone 27 has an amplitude fluctuation equivalent to a noise signal, but hardly changes. Absent.

  Here, for example, if the steady value of the sensor output waveform measured in advance is 1.5 V, the first threshold value is “steady value−0.25 V: 1.25 V”, and the second threshold value is “steady value”. +0.5 V: 2.0 V ”. The negative pressure signal is identified as “on” when the sensor output falls below the first threshold (negative pressure identification signal), and similarly, the positive pressure signal becomes “on” when the sensor output exceeds the second threshold. (Positive pressure identification signal).

  In the present embodiment, the T1 to T5 modes are set according to the appearance pattern of the positive pressure / negative pressure identification signal, and the time of each mode is handled as t1 to t5. For example, the T1 mode is a section in which a negative pressure identification signal is detected, the T2 mode is a section from the detection of the negative pressure identification signal to the detection of the positive pressure identification signal, and the T3 mode in which the positive pressure identification signal is detected. The T4 mode is a section from the detection of the positive pressure signal to the detection of the negative pressure identification signal, and the T5 mode is a section in which the negative pressure identification signal is detected, and is substantially the same as the T1 mode.

  Thus, in the present embodiment, substantially four states (sections) are detected. The vehicle door monitoring device 100 selects the T2 mode when a steady value is detected for a predetermined time or longer, and sets T2 to the normal mode.

  Here, door opening will be described. When the door is opened, the air around the door is guided to the outside of the passenger compartment following the rotational movement accompanying the opening of the door. As a result, a large air movement occurs, the pressure in the passenger compartment decreases, the sensor output indicates a negative pressure, the mode shifts from the T2 mode to the T1 mode, and passes through the negative pressure peak point a1. Next, the communication between the vehicle interior and the exterior of the vehicle interior causes the air outside the vehicle interior to flow into the vehicle interior, and the pressure in the vehicle interior becomes higher than the steady pressure by swinging back, and the positive pressure peak point b1 is set to the T3 mode. pass.

  After that, air that has flowed too much into the passenger compartment is released to the outside of the passenger compartment, so that the pressure in the passenger compartment begins to drop and enters the T4 mode, and further falls below the steady pressure to enter the T5 (T1) mode and passes through the negative pressure peak point a2. To do. Further, after that, the T5 (T1) mode is changed to the T2 mode by returning to a stable steady state with almost no air movement. The above is the door open state change. Next, door closing will be described.

  FIG. 3 shows a sensor output waveform when the door is closed from the opened state. Initially, the pressure is steady (T2 mode), but when the door is closed, the air around the door flows into the vehicle interior and is pushed into the vehicle interior. For this reason, the pressure in the passenger compartment increases to enter the T3 mode, and passes through the positive pressure peak point b1.

  After that, the T4 mode is set to return to the steady state, the pressure becomes lower than the steady pressure by the swing back, the T5 (T1) mode is set, and the negative pressure peak point a1 is passed. After that, the T2 mode is set by returning to a stable steady state with almost no air movement. Here, the difference between the door opening and the door closing is whether or not the positive pressure identification signal is detected first after the measurement is started, and determination can be made by paying attention to this point. Next, a description will be given of passing with another vehicle or passing.

  FIG. 4 shows a waveform of a sensor output observed when another vehicle approaches and passes at high speed on the main vehicle on which the vehicle door monitoring device 100 is installed. Such a case is equivalent to a situation in which the door closing and the door opening are continuous.

  Initially it is steady pressure (T2 mode), but when the other vehicle approaches, the air present around the other vehicle compresses the outside of the passenger compartment of the vehicle, thereby increasing the pressure in the passenger compartment and entering the T3 mode. It passes through the positive pressure peak point b1.

  Next, when the other vehicle passes by the side of the vehicle, the air that presses the outside of the vehicle interior of the vehicle moves, and further, the air outside the vehicle compartment is swept away, thereby reducing the pressure outside the vehicle interior and the interior of the vehicle interior. For this reason, the increased pressure in the passenger compartment of the vehicle is released and the T4 mode is set. Further, since the pressure outside the passenger compartment has decreased, the negative pressure in the passenger compartment results in the T5 (T1) mode, which passes through the negative pressure peak point a1.

  When the other vehicle moves away, the pressure recovery outside of the passenger compartment occurs due to the inflow of air from the surroundings, and the T2 mode is set. After that, the pressure in the passenger compartment becomes higher than the steady pressure and the mode shifts to the T3 mode to be positive pressure. Passes through the peak point b2.

  Next, since the air that has flowed too far into the outside of the passenger compartment is released to the surroundings, the pressure in the passenger compartment starts to decrease and enters the T4 mode, and further decreases from the steady pressure to the T5 (T1) mode, and the negative pressure peak point a2 is set. pass. Furthermore, after that, the T2 mode is set by returning to a stable steady state with almost no air movement.

  As described above, since the T3 mode that is not detected when the door is normally opened is detected when the other vehicle passes at high speed, it can be easily distinguished.

  FIG. 5 shows the waveform of the sensor output when an impact is applied to the vehicle window or body. The sensor output waveform is similar to that when the door is closed. However, since the duration time of the positive pressure identification signal and the negative pressure identification signal is shorter than that of normal door closing, the sensor output waveform can be easily distinguished. Since the behavior of the sensor output waveform is similar to that of the door closing, the description is omitted.

  FIG. 6 shows a processing diagram in the door opening determination of the vehicle door monitoring device. Hereinafter, the processing flow will be described with reference to the sensor output waveform of the door opening detection in FIG. 2 and FIG. The processing diagram of FIG. 6 has a series of processing flow that starts a mode transition from step S1 of the T2 mode, which is a normal mode, reaches from the T3 mode to the T4, T5, T1 mode, and returns to the T2 mode in step S8. ing.

  More specifically, the vehicle door monitoring device (1) determines that the door is open when a negative pressure identification signal is detected in the T2 mode of FIG. 6, and moves to the T1 mode in step S2. (2) When the time t1, which is the duration of the negative pressure identification signal, is acquired in the moved T1 mode, the process moves again to the T2 mode in step S3.

  Next, when the vehicle door monitoring device detects a positive pressure identification signal in (3) T2 mode, the vehicle door monitoring device moves to T3 mode in step S4. (4) When the time t3, which is the duration of the positive pressure identification signal, is acquired in the moved T3 mode, the process moves to the T4 mode in step S5.

  Next, the vehicle door monitoring device (5) detects a negative pressure identification signal in the T4 mode, or moves to the T5 mode in step S6 when a predetermined time has elapsed in the T4 mode. This is because the T4 mode is a behavior due to shaking back, and thus the transition is completed in a predetermined time, for example, a short time of 50 ms or less.

  When the vehicle door monitoring device detects a negative pressure identification signal in (6) T5 mode, the vehicle door monitoring device moves to T1 mode in step S7 and acquires t1 time. If the negative pressure identification signal is not detected in the T5 mode, for example, after the elapse of 50 ms, the process moves to the T1 mode in step S7. Note that (7) when the negative pressure identification signal is not detected in the T1 mode, in step S8, for example, after a lapse of 200 ms, the process moves to the T2 mode and the series of processes is completed.

  FIG. 7 is a flowchart showing a process flow of the door opening determination process of the vehicle door monitoring apparatus. Hereinafter, the process flow will be described using the sensor output in the door open detection of FIG. 2 and the flowchart of FIG.

The first is the T2 mode, and when t1 of the T1 mode is acquired in step S10, the process moves to step S12. In step S12, when T2 mode and T3 mode are detected and t3 is acquired, the process moves to step S14. In step S14, when the acquired t3 is, for example, 20 ms or longer ( first determination time), the process proceeds to step S16. In step S16, when t1 + t3 is 250 ms or less ( second determination time), it is determined as “door open” in step S18. If it is determined in step S10 that t1 has not been acquired, the process moves to step S20. If the condition does not match after step S12, it is determined as “other” in step S42.

  Next, the flow of the door closing process will be described using the flowcharts of FIGS. The T2 mode is initially set. If the T1 mode cannot be obtained in step S10 without detecting the T1 mode, the process proceeds to step S20. In step S20, when t3 is acquired in the T3 mode, the T4 mode and the T5 (T1) mode are detected, and the process proceeds to step S22.

  In step S22, when t5 (t1) is acquired, the process moves to step S24. If t3 is not detected in step S24, the process moves to step S26. In step S26, since t3 is not 30 ms or more, the process moves to step S32.

  In step S32, if the total of the acquired t3 and t5 (t1) is, for example, 250 ms or less, it is determined as “door closed” in step S36. If t3 can be acquired in step S24, the vehicle may pass as shown in FIG. In step S28, when the total of the acquired t3, t5 (t1) and t3 is 300 ms or less, it is determined as “pass” in step S40.

  If the acquired t3 is not 30 ms or longer in step S26, the process moves to step S30. In step S30, if the sum of t1 and t3 is 100 ms or less, it is determined as “impact” in step S38. If the conditions do not match, it is similarly determined as “others” in step S24.

  As described above, when the present embodiment is used as described above, it becomes a simple measuring means for detecting air vibration, and prevents malfunction by detecting that the door is opened based on the identification time and the pressure change history. be able to. Furthermore, the installation work is facilitated because it is only necessary to place the vehicle in a predetermined place in the vehicle interior.

  In this embodiment, the air vibration was measured using a microphone as a sensor. However, the present invention is not limited to this, and a semiconductor pressure sensor or other pressure sensor may be used. A process for generating a sparse wave with a speaker that generates sound and verifying the door opening is also suitable. Further, in the present embodiment, specific numerical values are used for explanation, but the present invention is not limited to this, and is set to an optimum value depending on the vehicle to be mounted and the installation location.

It is a block diagram which shows the structure of the vehicle door monitoring apparatus which concerns on this invention. It is a wave form diagram which shows the sensor output in a door open detection. It is a wave form diagram which shows a sensor output when a door closes. It is a wave form diagram which shows the sensor output in the high speed passage of another vehicle. It is a wave form diagram which shows a sensor output when an impact is added to a vehicle. It is a processing diagram figure in the door open determination of the vehicle door monitoring apparatus which concerns on this invention. It is a flowchart figure which shows the flow of a process of door opening determination of the vehicle door monitoring apparatus which concerns on this invention.

Explanation of symbols

  10 One-chip microcomputer, 11 ROM, 12 RAM, 13 CPU, 14 D / A converter, 15 A / D converter, 21 and 22 amplifier, 23 Switch input, 24 Display, 25 Communication device, 26, 31 Antenna 27 Microphone, 28 Speaker, 30 Remote control, 100 Vehicle door monitoring device.

Claims (6)

In the vehicle door monitoring device for monitoring air vibrations in the passenger compartment and determining whether the vehicle door has been opened,
A measuring means for measure the air vibration in the cabin, and outputs the measured values,
A negative pressure detecting means for outputting a negative圧識another signal when the measured value is lower than the first threshold value which is set by the constant Tsunene low,
A positive pressure detecting means for outputting a positive圧識another signal when the measured value for the second threshold is set higher than the constant Tsunene is high,
Timing means for acquiring time information indicating each of the output timing and output time of the negative圧識specific signals and positive圧識another signal,
A determining means for the determination that the door is kicked open based on the total Tokijo report,
With
The judging means is
When the output of the negative pressure identification signal is first detected and the positive pressure identification signal is detected after the negative pressure identification signal, the output time of the negative pressure identification signal detected first, and the negative pressure identification signal based on the output time of the detected positive圧識another signal after the vehicle door monitoring device, characterized in that the door to the determination that has been kicked open. The vehicle door monitoring device according to claim 1,
The judging means is
The output time of the positive pressure identification signal detected after the negative pressure identification signal detected first is equal to or longer than a predetermined first determination time, and the output time of the negative pressure identification signal detected first and its negative pressure the sum of the output time of the detected positive圧識another signal after the identification signal, when it is less than the second determination time, the vehicle door monitoring device, characterized in that the determination that the door is kicked open. In the vehicle door monitoring apparatus according to claim 1 or 2,
The judging means is
When the output of the positive pressure identification signal is first detected and the negative pressure identification signal is detected after the positive pressure identification signal, the output time of the positive pressure identification signal detected first, and the positive pressure identification signal A vehicle door monitoring device that determines that the door has been closed based on the output time of the negative pressure identification signal detected after . In the monitoring method of the vehicle door monitoring device for monitoring air vibrations in the passenger compartment and determining whether the vehicle door has been opened,
A measuring step to measure the air vibration in the cabin, and outputs the measured values,
A negative pressure detecting step of outputting a negative圧識another signal when the measured value is lower than the first threshold value which is set by the constant Tsunene low,
A positive pressure detecting step of outputting a positive圧識another signal when the measured value is higher than the second threshold value which is set higher than the constant Tsunene,
Time counting step of acquiring time information indicating each of the output timing and output time of the negative圧識specific signals and positive圧識another signal,
A determination step of the determination that the door is kicked open based on the total Tokijo report,
With
Judgment process is
When the output of the negative pressure identification signal is first detected and the positive pressure identification signal is detected after the negative pressure identification signal, the output time of the negative pressure identification signal detected first, and the negative pressure identification signal monitoring method for a vehicle door monitoring device on the basis of the output time of the detected positive圧識specific signal, wherein the door is a process for the determination that has been kicked open after. In the monitoring method of the vehicle door monitoring device according to claim 4,
Judgment process is
The output time of the positive pressure identification signal detected after the negative pressure identification signal detected first is equal to or longer than a predetermined first determination time, and the output time of the negative pressure identification signal detected first and its negative pressure vehicle door sum of the output time of the detected positive圧識another signal after the identification signal, when it is less than the second determination time, wherein the door is a process for the determination that has been kicked open Monitoring device monitoring method. In the monitoring method of the vehicle door monitoring device according to claim 4 or 5,
Judgment process is
When the output of the positive pressure identification signal is first detected and the negative pressure identification signal is detected after the positive pressure identification signal, the output time of the positive pressure identification signal detected first, and the positive pressure identification signal A method for monitoring a vehicle door monitoring device, characterized in that it is a step of determining that a door is closed based on an output time of a negative pressure identification signal detected after the step .

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