JP5036787B2 - Drive recorder - Google Patents

Description

  The present invention relates to a drive recorder, and more particularly to a drive recorder that detects acceleration with an acceleration sensor.

  2. Description of the Related Art Conventionally, a so-called drive recorder has been proposed that records an image around a vehicle with a camera installed in the vehicle and records the surrounding image and vehicle speed when an impact is applied to the vehicle, such as a collision or sudden braking. ing. By providing the drive recorder in the vehicle, it is possible to verify the cause of the accident by analyzing the recorded information when an accident occurs. In addition, the driver's awareness of safe driving can be improved, and a video recording the daily driving situation can be used for safety driving guidance and the like.

  Patent Documents 1 and 2 disclose a drive recorder that cyclically stores video captured by an in-vehicle camera and records the video stored at the time of an accident on another recording medium. Patent Documents 3 and 4 disclose a drive recorder that circulates and stores travel data such as vehicle speed and transmission shift position and records the travel data stored when an accident occurs on another recording medium.

JP-A 63-16785 Japanese Patent Laid-Open No. 06-237463 Japanese Patent Application Laid-Open No. 06-331391 Japanese Patent Laid-Open No. 06-186061

When driving on a curve, particularly a sharp curve, even when a normal steering wheel operation is performed, a large acceleration acts in the left-right direction of the vehicle, and it may be erroneously detected that a large acceleration is applied to the vehicle. When video information is recorded on a memory card due to erroneous detection, a lot of unnecessary video information is recorded, and there is a problem that a memory card with a limited capacity cannot be used efficiently.
Therefore, the present invention provides a drive recorder capable of detecting an acceleration so that it is not erroneously detected that a large acceleration is applied to the vehicle as long as a normal steering wheel operation is performed even while driving on a curve. Objective.

  The drive recorder according to the present invention includes an acceleration sensor that detects the first acceleration in the traveling direction of the vehicle and the second acceleration in the left-right direction of the vehicle, and a value obtained by subtracting the correction value from the absolute values of the first acceleration and the second acceleration. And a controller that records the video information received from the imaging unit on a recording element when the combined acceleration exceeds a threshold value.

  According to the drive recorder of the present invention, the correction value is subtracted from the absolute value of the acceleration detected in the left-right direction of the vehicle during curve driving. Even so, it was no longer erroneously detected that the vehicle had a large acceleration.

It is a figure which shows the example which mounted the drive recorder in the vehicle. It is a figure which shows the example which installed the drive recorder etc. in the vehicle. It is a perspective view of a drive recorder main body. It is a figure which shows the example of an external appearance of a reproducing | regenerating apparatus. It is a block diagram which shows the electric constitution of a drive recorder. It is a block diagram which shows the electric constitution of a power supply control circuit. It is a block diagram which shows the electric constitution of a reproducing | regenerating apparatus. It is a figure which shows an example of the processing flow of a drive recorder. It is a figure which shows the self-diagnosis processing flow of an acceleration sensor. It is a figure which shows the positional relationship of a drive recorder and an acceleration sensor. It is a figure which shows a G value detection process flow. It is a figure which shows the flow for performing the confirmation process of the output of the acceleration sensor. It is a figure which shows the processing flow of G detection. It is a figure which shows the example (1) of a video information recording by G detection. It is a figure which shows the example of recording (2) of the video information by G detection. It is a figure which shows the example (3) of recording of the video information by G detection. It is a figure which shows the example (4) of recording of the video information by G detection. It is a figure which shows a voltage reduction process flow (1). It is a figure which shows a voltage reduction process flow (2). It is a figure which shows a voltage drop state. It is a figure which shows a mode switching flow. It is a figure which shows a reproduction | regeneration order. It is a figure which shows the flow of the operation example of a memory card. It is a figure which shows the correspondence table of a visual field range. It is a figure which shows the example of a screen for displaying video information. It is a figure which shows a driving | operation condition classification | category processing flow. It is a figure which shows a sample row | line etc. FIG. It is a figure which shows an example of a peak master file. It is a figure which shows an example of an edit screen. It is a figure which shows the typical pattern which shows the driving | running state of sudden start. It is a figure which shows the typical pattern which shows the driving condition of a sudden brake. It is a figure which shows the typical pattern which shows the driving condition of a normal brake. It is a figure which shows the typical pattern which shows the driving | running state of a left sudden handle. It is a figure which shows the typical pattern which shows the driving | running state of a right-hand steering wheel.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. The technical scope of the present invention is not limited to these embodiments, but covers the invention described in the claims and equivalents thereof. Moreover, it is also possible to implement with the form which added the various change in the range which does not deviate from the meaning of this invention.

  First, information recording in the drive recorder will be described.

  FIG. 1 is a diagram showing an example in which a drive recorder 2 is mounted on a vehicle 1.

  A drive recorder 2 is installed in the vehicle 1 and is connected to a first camera 3 that captures the front of the vehicle 1 and a second camera 4 that captures the rear of the vehicle 1. Video information from the first camera 3 or the like is cyclically stored in the semiconductor storage unit 15 in the drive recorder 2. When a predetermined recording condition is satisfied, the video information stored in the semiconductor storage unit 15 is recorded in the memory card 6. The predetermined recording condition means a case where an impact is applied to the vehicle 1 due to the occurrence of an accident or the like, and details will be described later.

  In addition to the video information, the drive recorder 2 acquires operation information including vehicle speed information and the like, and cyclically stores it in the semiconductor storage unit 15 in the drive recorder 2. The operation information is recorded on the memory card 6 together with the video information in association with the video information when the recording condition described above is satisfied. Details of the operation information will be described later.

  FIG. 2 is a diagram illustrating an example in which the drive recorder 2 is installed in the vehicle 1.

  The drive recorder 2 is, for example, fixed to the end of the center panel at the lower left side of the handle, and the first camera 3 (and the second camera 4 not shown in FIG. 2), a GPS sensor 9, a vehicle speed sensor 10 (not shown), It is electrically connected to a battery 21 (not shown), an in-vehicle display unit 30 and the like. The first camera 3 is attached to the front glass surface on the back side of the vehicle interior mirror, images the front of the vehicle, and transmits video information to the drive recorder 2.

  FIG. 3 is a perspective view of the main body of the drive recorder 2.

  The drive recorder 2 includes a microphone 7, a photographing switch 8, a power switch 20, an LED 25, a buzzer 26, an unillustrated opening / closing sensor 27, an opening / closing knob 31 and the like.

  The microphone 7 collects sound in the vehicle 1. The photographing switch 8 is used for various inputs for determining timing for recording video information in the drive recorder 2, initialization of the drive recorder 2, and the like. The LED 25 and the buzzer 26 have a function of notifying the user of the status of the drive recorder 2 by generating light emission, warning sound, or the like.

  After the memory card 6 is inserted into a slot constituting the I / F 11 to be described later, the open / close knob 31 is slid and positioned to protect the memory card 6 (situation in FIG. 3). When removing the memory card 6, the open / close knob 31 is slid in the direction of arrow A. Further, the drive recorder 2 has an open / close sensor 27 that is linked to the open / close knob 31. When the open / close knob 31 is slid to the upper part of the memory card 6 (the state shown in FIG. 3), the drive recorder 2 is OFF indicating the closed state. A signal is output, and an ON signal indicating an open state is output in a state where the memory card 6 can be extracted.

  FIG. 4 is a diagram illustrating an example of the appearance of a playback device.

  Video information, operation information, and the like recorded on the memory card 6 are reproduced by a reproduction device 400 configured by a personal computer or the like. The memory card 6 is inserted into an I / F connected to a personal computer, and video information, operation information, and the like are read. The user can investigate the running state of the vehicle or the cause of the accident by verifying the reproduced video information and operation information.

  FIG. 5 is a block diagram showing an electrical configuration of the drive recorder 2.

  The first camera 3 is controlled to photograph the front of the vehicle 1 and output an analog video signal as the first video information 500, for example, a CCD image sensor (Charge Coupled Device Image Sensor) or a CMOS image as a two-dimensional image sensor. It consists of a sensor (Complementary Metal Oxide Semiconductor Image Sensor).

  The second camera 4 is installed in the vehicle 1 as a second camera, and is controlled so as to capture a different direction from the camera 3 such as the rear of the vehicle or the passenger compartment and output an analog video signal as the second video information 501. The When only one camera is required, it is not necessary to connect the second camera 4 to the drive recorder 2.

  The acceleration sensor 5 is configured by a so-called G sensor (Gravity Accelerative Sensor) that detects the magnitude of an impact applied to the vehicle 1 as a gravitational acceleration. It is made of a semiconductor that generates a current based on the gravitational acceleration when it receives an impact, detects the magnitude of the gravitational acceleration in the longitudinal direction and the lateral direction of the vehicle, and outputs the gravitational acceleration information 502 to the CPU 24.

  The memory card 6 is a recording medium that is removable from the drive recorder 2, and is configured by an SD card (Secure Digital Memory Card) that is a programmable nonvolatile semiconductor memory card. Video information and operation information are recorded in the memory card 6. Further, the memory card 6 separately records various information such as a recording condition to be described later, a unique ID of the memory card 6, an ID of a user (for example, a taxi crew member) who uses the memory card 6, or name data. The Further, the memory card 6 is provided with a dip switch, and the memory card 6 can be set in a write-inhibited state by the operation of the dip switch.

  In this embodiment, an SD card is used as a removable storage medium. However, the present invention is not limited to this, and other removable memory cards (for example, a CF card (Compact Flash Card) or a memory) Stick etc.), a hard disk, etc. can also be used. Further, instead of the memory card 6, the drive recorder 2 can be used with a built-in hard disk. In this case, the drive recorder 2 is provided with a transmission circuit, and the video information and operation information recorded on the hard disk by wireless communication are used. What is necessary is just to comprise so that it may transmit to the reproducing | regenerating apparatus 400.

  The microphone 7 is electrically connected to the CPU 24, and is configured to collect sound inside or outside the vehicle 1 and transmit it to the CPU 24 as sound information 503. The audio information 503 is converted into a digital signal by an analog / digital converter in the CPU 24. Note that it is preferable to use a unidirectional microphone having high sensitivity on the front side of the microphone so as not to unnecessarily collect noise on the road.

  The imaging switch (imaging SW) 8 transmits a signal to the electrically connected CPU 24 when operated by the user. Thereby, the CPU 24 controls the video card information and the operation information stored in the second RAM 15 to be recorded in the memory card 6. That is, the operation of the photographing SW 8 acts as the establishment of the recording condition. Only the video information at the moment when the photographing SW 8 is operated may be recorded on the memory card 6. The photographing SW 8 is also used as an operating means for using other functions of the drive recorder 2 as will be described later.

  A GPS (Global Positioning System) receiver 9 receives radio signals including satellite orbits from a plurality of GPS satellites and time data from atomic clocks mounted on the satellites, and the time difference between the received radio waves By calculating the relative distance difference with each satellite, current location information is obtained. By capturing the radio waves of the three satellites, the position on the plane on the earth can be determined. When detecting the current location information, the GPS receiver 9 transmits GPS information 504 including position information and time information to the CPU 24.

  The vehicle speed sensor 10 outputs the rotation of the rotor provided on the wheel shaft of the vehicle 1 as a rotation pulse signal 505, and is configured by a magnetic sensor or an optical sensor. Note that the CPU 24 calculates speed information of the vehicle 1 by calculating the number of wheel rotations per unit time from the pulse signal received from the vehicle speed sensor 10.

  The interface (I / F) 11 also constitutes a slot for the memory card 6 provided in the drive recorder 2, a so-called slot portion. The I / F 11 transfers the recording information 506 including the video information and operation information transmitted from the drive recorder 2 to the inserted memory card 6, and the various information 507 stored in advance in the drive recorder 2 to the CPU 24. Forward.

  The video switch (hereinafter “video SW”) 12 is a switch for switching a camera to be photographed when a plurality of cameras are provided. In the present embodiment, the first camera 3 and the second camera 4 are connected, and one camera is selected by a selection signal 508 from the CPU 24. Video information from the selected camera is output to the image processing circuit 13 as selected video information 509. Note that the video SW 12 may be configured to have a clocking function so that switching is performed at regular time intervals.

  The image processing circuit 13 converts selected video information 509 input from the first camera 3 and the second camera 4 via the video SW 12 into a digital signal, and generates and outputs image data 510. The image processing circuit 13 is composed of JPEG-IC (Joint Photographic coding Experts Group-Integrated Circuit), and creates data in JPEG format. In this case, since JPEG-IC does not have a function of designating an address and outputting data, 30 files are written to a first RAM (Random Access Memory) 14 per second, and overwriting is performed for each file.

  The first RAM 14 temporarily stores the image data 510 converted by the image processing circuit 13. The first RAM 14 is connected to a DMA (Direct Memory Access) circuit in the CPU 24, and one out of three inputted images, that is, 10 files per second are transferred to the second RAM 15 by the DMA function and circulated. Memorized.

  The second RAM (semiconductor storage unit) 15 cyclically stores the video information converted into the image data by the image processing circuit 13 and the operation information.

  For example, SDRAM (Synchronous Dynamic Random Access Memory) is used for the first RAM 14 and the second RAM 15. Since SDRAM is designed to operate in synchronization with the CPU clock, it has a short I / O waiting time, and can be accessed faster than conventional DRAM (Dynamic Random Access Memory). This is because it is suitable for the control for processing the video data at a high speed.

  The nonvolatile ROM 16 stores a control program 17 and the like for comprehensively controlling the hardware resources constituting the drive recorder 2. A mask ROM may be used as the nonvolatile ROM 16, but a program can be written and erased by using a flash memory which is a programmable nonvolatile semiconductor memory, an EEPROM (Erasable Programmable Read Only Memory), a ferroelectric memory, or the like. It becomes possible.

  The control program 17 is stored in the non-volatile ROM 16 and is read by the CPU 24 when the drive recorder 2 is activated, and functions as a program for controlling each part and for data calculation processing.

  The accessory switch (ACC switch) 19 is electrically integrated with an engine start key cylinder provided in the vehicle 1. When the switch is turned on by the user's key operation, an accessory on signal 511 is transmitted to the CPU 24 and the power supply control circuit 22 of the drive recorder 2. When the drive recorder 2 receives the accessory on signal 511 of the ACC switch 19, the power is supplied from the power control circuit 22 and control is started. Note that an ignition key output signal (IG ON signal) can be used instead of the output signal of the ACC switch 19.

  The power switch (power SW) 20 transmits a power-on signal to the CPU 24 and the power control circuit 22 of the drive recorder 2 when the user performs a switch operation. This can be used when it is desired to operate the drive recorder 2 without turning on the ACC switch 17.

  The battery 21 is provided in the vehicle 1 and supplies power to the main body of the drive recorder 2. The battery supplies power to the power control circuit 22. The battery 21 may be any battery that can be installed in a vehicle and can generate an electromotive force of 12V.

  The power control circuit 22 supplies power from the battery 21 to the CPU 24 and each part of the drive recorder 2. Details of the power supply control circuit 22 will be described later.

  A CPU (Central Processing Unit) 24 operates as a control device of the drive recorder 2 and is configured by a microcomputer or the like. Based on the control program 17, the CPU 24 executes control of each part of the drive recorder 2 and data calculation processing.

  The LED 25 is lit while the drive recorder 2 is activated due to the supply of power from the CPU 24 and notifies the user that the drive recorder 2 is being activated. Further, when an abnormality occurs in the drive recorder 2, the CPU 24 performs predetermined blinking to notify the user of the occurrence of the abnormality.

  When an abnormality occurs in the drive recorder 2, the buzzer 26 is configured to generate a predetermined warning sound by the CPU 24 and notify the user of the occurrence of the abnormality.

  The open / close sensor 27 is configured to output an open signal and a close signal in accordance with the movement of the open / close knob 31 when the memory card 6 is inserted or removed.

  An RTC (Real Time Clock) 28 generates a signal corresponding to the current time and transmits it to the CPU 24.

  The display unit 30 is configured by a liquid crystal display or the like, and reproduces video information recorded on the memory card 6 in a predetermined situation described later. Although FIG. 2 shows the case where the display of the navigation device mounted on the vehicle is used as the display unit 30, a separate display may be used as the display unit 30. The use of the display unit 30 makes it possible to verify the cause of the accident on the spot when an accident occurs. In any case, the drive recorder 2 preferably has an output port for outputting video information.

  Note that the drive recorder 2 is housed in the same housing as the first camera 3, the second camera 4, the GPS receiver 9, and / or the display unit 30 as an apparatus dedicated to video recording, and may be configured integrally. Good. The drive recorder 2 can also be configured as a function of the in-vehicle navigation device.

  FIG. 6 is a block diagram showing an electrical configuration of the power supply control circuit 22.

  The power supply control circuit 22 includes a first power supply circuit 40, a second power supply circuit 41, a third power supply circuit 42, a first detection unit 43, a second detection unit 44, a third detection unit 45, a backup battery 46, and the like. ing.

  The first power supply circuit 40 starts operating when the ACC switch 19 or the power switch 20 is turned on and functions as a constant voltage power supply that receives power from the battery 21 rated at 12.0V and outputs 6.0V. To do. The output from the first power supply circuit 40 is supplied to the first camera 3, the second camera 4, and the like.

  The second power supply circuit 41 functions as a constant voltage power supply that receives power from the 6.0 V rated first power supply circuit 40 and outputs 3.3V. The output from the second power supply circuit 41 is supplied to the JPEG circuit, the GPS receiver 9, the CPU 24, and the like that constitute the image processing circuit 13.

  The third power supply circuit 42 functions as a constant voltage power supply that receives power from the 3.3V rated second power supply circuit 41 and outputs 1.8V. The output from the third power supply circuit 41 is supplied to the CPU 24 and the like.

  The 1st detection part 43 detects the output voltage of the battery 21, and outputs the 1st voltage reduction signal S1 to CPU24, when the output voltage from the battery 21 falls below 8.0V. Further, the second detection unit 44 detects the output voltage of the first power supply circuit 40, and when the output voltage from the first power supply circuit 40 decreases to 3.7 V or less, the second detection voltage signal S2 is sent to the CPU 24. Output. Further, the third detection unit 45 detects the output voltage of the second power supply circuit 41, and outputs the reset signal S3 to the image processing circuit 13 when the output voltage of the second power supply circuit 41 decreases to 3.0 V or less. Each element is output to the JPEG circuit, the GPS receiver 9 and the CPU 24, and each element is reset to prevent malfunction due to a low voltage.

  The backup battery 46 is composed of two capacitors, and even when the output voltage of the battery 21 is lowered, the power is such that at least the JPEG circuit, the GPS receiver 9 and the CPU 24 that constitute the image processing circuit 13 can be driven for a predetermined time. It is comprised so that it can supply. If an impact is applied to the vehicle due to a collision accident or the like, the battery 21 may be damaged, or the connection line between the battery 21 and the power supply control circuit 22 may be broken. Therefore, the backup battery 46 supplies the stored power to the CPU 24 and the like. Thus, even in such a case, video information being processed can be stored as much as possible. The voltage reduction process will be described later.

  FIG. 7 is a block diagram showing an electrical configuration of the playback device 400.

  The interface (I / F) 411 configures a so-called slot portion of the memory card 6 provided in the playback device 400. The I / F 411 transfers video information, operation information, and the like recorded in the memory card 6 to the playback device 400 side.

  The RAM 414 is used to temporarily store data when the CPU 424 performs image processing of video information transferred from the memory card 6 and information processing of operation information. For example, an SDRAM is used as the RAM 414.

  The nonvolatile ROM 416 stores a control program 417 and the like for comprehensively controlling the hardware resources constituting the playback device 400. As the nonvolatile ROM 16, for example, an EEPROM, a ferroelectric memory, or the like is used.

  The control program 417 is stored in the non-volatile ROM 416, and is read out to the CPU 424 when the playback device 400 is activated, and functions as a program for controlling each unit and data calculation processing.

  The CPU 424 operates as a control device for the playback device 400 and is configured by a microcomputer or the like. Based on the control program 417, the CPU 424 executes control of each unit of the playback device 400, data calculation processing, and the like.

  The operation unit 430 includes a keyboard, a mouse, and the like, and is used as a means for performing an operation input to the CPU 424 when the user operates the playback device 400.

  The display unit 440 includes a liquid crystal display device and the like, and is used to appropriately display video information, operation information, and the like recorded on the memory card 6.

  The map information recording unit 450 is composed of a recording medium such as a hard disk or a DVD, and records map information including road information and speed limit information.

  The card information recording unit 460 is configured by a recording medium such as a hard disk and is used for recording video information, operation information, and the like recorded on the memory card 6.

  FIG. 8 is a diagram showing an overall processing flow of the drive recorder 2.

  The processing flow shown in FIG. 8 is mainly executed by the CPU 24 of the drive recorder 2 in cooperation with each component of the drive recorder 2 according to the control program 17.

  When the ACC switch 19 is turned on and the power switch 20 is turned on, when the power is turned on and the operation start of the drive recorder 2 is instructed, the CPU 24 performs a start-up process (S1). The start-up process includes an initialization process by a boot program and a self-diagnosis process regarding various elements related to the drive recorder 2. The self-diagnosis process will be described later.

  When the activation process of the drive recorder 2 is completed, the CPU 24 stores the video information in the second RAM 15 in a circulating manner (S2). Specifically, the CPU 24 alternately acquires still image data (640 × 480 pixels) captured by the first camera 3 and the second camera 4 at a rate of 10 images per second (that is, from the camera 3). Are alternately acquired every 0.2 seconds, and still images from the camera 4 are acquired every 0.2 seconds), and are cyclically recorded in the second RAM 15 via the first RAM 14. Further, every time the still image data obtained by the first camera 3 and the second camera 4 is acquired, the CPU 24 acquires operation information and records it in the second RAM 15 in association with the still image data. The time interval and the number of still image data acquired by the CPU 24 described above are examples, and the present invention is not limited to this.

  Next, the CPU 24 determines whether or not a recording condition described later is satisfied (S3). The case where the recording condition is satisfied means the following three cases. However, one or two of them may be used, and other conditions other than the three may be defined.

    1. G detection: A case where the acceleration sensor 5 detects a gravitational acceleration of 0.40 G or more. The reason why the recording condition is satisfied is that when such a gravitational acceleration is applied to the vehicle 1, it can be recognized that an accident has occurred or that the accident has been imminent. The set value (0.40G) is an example, and other positions can be adopted. Details will be described later.

    2. Speed trigger: A case where the speed difference within a predetermined period of the vehicle 1 detected from the vehicle speed sensor 10 is equal to or greater than a threshold value. Specifically, when traveling at 60 km / h or more and the deceleration for one second becomes 14 km / h or more, it is determined that the recording condition is satisfied. The reason why the recording condition is satisfied is that when the vehicle 1 undergoes such a speed change, it can be recognized that an accident has occurred or that the accident has been imminent. The above set value (deceleration for 1 second during traveling at 60 km / h or more, 14 km / h or more) is an example, and other values can be adopted.

    3. Shooting SW: A case where the shooting SW8 is operated.

  Next, when the recording condition is satisfied, the CPU 24 has a total of 20 seconds of video information (200 still images for each recording condition) and 12 seconds before the recording condition is satisfied and 8 seconds after the recording condition is satisfied. The operation information is transferred from the second RAM 15 to the memory card 6 and recorded (S4). When the recording condition is satisfied, event data indicating the satisfied recording condition (data indicating one of the above three) is recorded together on the memory card 6. The memory card 6 has a capacity capable of recording video information for at least 15 events.

  If the recording condition is satisfied, the audio information acquired from the microphone 7 for a total of 20 seconds, 12 seconds before the recording condition is satisfied and 8 seconds after the condition is satisfied, is recorded on the memory card 6 together with the video information and the like. You may comprise so that it may do. Since the video information, operation information, and the like recorded in the memory card 6 can be displayed on the playback device 400, the user of the drive recorder 2 can verify the running state and accident situation of the vehicle 1. . Note that the above-described period (12 seconds before the recording condition is satisfied and 8 seconds after the recording condition is satisfied) that the CPU 24 records on the memory card 6 when the recording condition is satisfied is an example, and the present invention is not limited to this.

  The operation information is the following information.

    1. Gravitational acceleration information (G1, G2) detected on each axis of the acceleration sensor 5.

    2. Position information and time information of the vehicle 1 detected from the GPS receiver 9.

    3. Speed information detected from the vehicle speed sensor 10.

    4). ON / OFF information of the ACC switch 19.

  Note that the content of the operation information is not necessarily limited to the information described above, and may include information related to the operation and traveling of the vehicle 1 such as the lighting state of lights such as a blinker and the steering angle of the steering wheel. good.

  Next, the CPU 24 determines whether or not an end signal based on the OFF signal of the ACC switch 19 or the OFF signal of the power switch 20 has been received (S5). If the end signal is received, the CPU 24 performs an end process. (S6), a series of processing ends. If the end signal has not been received, S2 to S4 are repeatedly executed.

  The self-diagnosis process of the drive recorder 2 will be described.

  The self-diagnosis process of the drive recorder 2 is performed in the start-up process (S1) in the process flow shown in FIG. 8, and the target is the acceleration sensor 5, the JPEG-IC constituting the image processing circuit 13, the RTC 28, and the second one. This is a connection state of the first camera 3 and the second camera 4. The reason why the drive recorder 2 performs a self-diagnosis is that the data recorded by the drive recorder 2 may be used as evidence for verifying an accident or the like. Therefore, when there is a problem in the drive recorder 2 and data cannot be properly recorded, or to confirm in advance that no problem has occurred in the recorded data.

  FIG. 9 is a diagram showing a flow of self-diagnosis processing of the acceleration sensor 5.

  First, the CPU 24 outputs the first axis output G1 parallel to the front-rear direction of the vehicle 1 among the three axes (x-axis, y-axis, and z-axis) of the acceleration sensor 5 and the preset vehicle. The output of the output G2 of the second axis parallel to the left-right direction of 1 is acquired (S11).

  FIG. 10 is a diagram showing a positional relationship between the drive recorder 2 and the acceleration sensor 5. FIG. 10 (a) shows a case where the drive recorder 2 is set up and placed on the vehicle 1 (see FIG. 2), FIG. 10 (b) shows a case where the vehicle 1 is placed next to the drive recorder 2, and FIG. FIG. 10C is a view showing a state where the drive recorder 2 is further inclined by an angle θ from the state of FIG. Moreover, in Fig.10 (a)-FIG.10 (c), the direction of the arrow B has shown the advancing direction of the vehicle.

  Although the acceleration sensor 5 has three axes, when the drive recorder 2 is arranged as shown in FIG. 10A, the output of the x axis is set as the output G1 of the first axis, and the y axis Is set to G2 of the second axis, and the output of the z axis is not used. When the drive recorder 2 is arranged as shown in FIG. 10B, the z-axis output is set as the first-axis output G1, the x-axis output is set as the second-axis output G2, The y-axis output is not used. Thus, since the drive recorder 2 uses the acceleration sensor 5 having three-axis outputs, the arrangement direction of the drive recorder 2 can be freely selected. However, for that purpose, it is necessary to set in advance which output is used as the output of the first axis and the second axis. Therefore, when the drive recorder 2 is installed in the vehicle, it is set which two of the X, Y, and Z axes are used.

  Next, the CPU 24 determines whether any one of the output G1 of the first axis and the output G2 of the second axis acquired in S11 outputs a value of 1 G or more for 5 seconds or more ( S12). In the normal state, both should output 0G. Therefore, detecting acceleration of 1G or more for 5 seconds or more can determine that some abnormality has occurred in the elements of the acceleration sensor. .

  Next, when the CPU 24 does not output a value of 1 G or more for 5 seconds or more in Step 12, the CPU 24 switches the test mode terminal (ST terminal) of the acceleration sensor 5 (S13), and electrical vibration is generated. The above situation is generated, the output is detected, and it is determined whether or not the output has changed (S14). If the output of the acceleration sensor 5 does not change even when the ST terminal is switched, it can be determined that there is a high possibility of not operating normally.

  Next, when there is a change in the output in S14, the CPU 24 determines that either one of the output G1 of the first axis and the output G2 of the second axis acquired in S11 is 0.7 G or more for 5 seconds or more. It is determined whether or not the above values are output (S15). In such a case, the acceleration sensor 5 itself may operate normally, but the axes set as the first axis and the second axis may not match the initial settings. In other words, the drive recorder 2 that should have been arranged as shown in FIG. 10 (a) has been moved as shown in FIG. 10 (b) and the output shaft has not been set. It is possible to determine that there is a high possibility. For example, when moving from FIG. 10A to FIG. 10B, the Y-axis set as the second axis is changed in the vertical direction, so that an output of 0.7 G or more is generated by gravity. .

  Next, when the CPU 24 does not output a value of 0.7 G or more for 5 seconds or more in S15, the CPU 24 determines that it is normal and sets the offset of the output G1 of the first axis and the output G2 of the second axis, that is, Processing is performed so that the value acquired in S11 is set to 0 (S16), and a series of processing ends. The cause of the offset may be a case where the drive recorder 2 is not attached to the vehicle 1 completely in parallel. For example, it may be attached as shown in FIG. 10B, but it may be attached at an angle as shown in FIG. 10C. The drive recorder 2 is configured to be able to operate appropriately by setting an offset until the tilt angle θ shown in FIG. 10C is about 30 degrees.

  If the output of either the first axis output G1 or the second axis output G2 acquired in S11 in S12 outputs a value of 1 G or more for 5 seconds or more, if the output does not change in S14, The CPU 24 determines that there is an abnormality in the acceleration sensor 5, turns on the LED 25 and generates a warning sound from the buzzer 26 to notify the user of the abnormality, stops operations other than the LED 25 and the buzzer 26, and the ACC switch 19 The above operation is continued until it is turned off or the power switch 20 is turned off (S18).

  When the output of either the first axis output G1 or the second axis output G2 acquired in S11 in S15 outputs a value of 0.7 G or more for 5 seconds or more, the CPU 24 attaches the drive recorder 2. It is determined that the setting has not been set after the direction change, and the operation of notifying the user by turning on the LED 25 and generating a warning sound from the buzzer 26 is continued until the ACC switch 19 is turned OFF or the power switch 20 is turned OFF (S17). However, since the acceleration sensor 5 operates normally, the operation of the drive recorder 2 is continued.

  Next, the self-diagnosis process of the connection state of the JPEG-IC, the RTC 28, and the first camera 3 and the second camera 4 constituting the image processing circuit 13 will be described.

  For the JPEG-IC constituting the image processing circuit 13, the interrupt signal input to the CPU 24 is constantly monitored every 16.7 ms, and when no interrupt occurs once in 500 ms, the CPU 24 It is determined that an abnormality has occurred in the JPEG-IC constituting 13. When it is determined that an abnormality has occurred, the CPU 24 turns on the LED 25 and generates a warning sound from the buzzer 26 to notify the user of the abnormality, and stops operations other than the LED 25 and the buzzer 26, and the ACC switch 19 The above operation is continued until OFF or the power switch 20 is turned OFF. The interrupt interval of 16.7 ms and the monitoring period of 500 ms are examples, and are not limited to these.

  For the RTC 28, the CPU 24 monitors the status bits indicating the year, month, date / time, second, etc. received from the RTC 28, and determines that an abnormality has occurred when data outside the specified range is received. If it is determined that an abnormality has occurred, the CPU 24 turns on the LED 25 and generates a warning sound from the buzzer 26 to notify the user of the abnormality, and sets the internal RTC of the CPU 24 to a predetermined value (for example, January 2001). 1 day, 0 hour 0 minute 0 second). The operation of the other drive recorder 2 is continued.

  Regarding the connection state of the first camera 3 and the second camera 4, the CPU 24 detects an abnormality when the size of one piece of image data transferred from the first RAM 14 to the second RAM 15 is 6592 bytes continuously for 10 seconds or more. It is determined that it has occurred (the connection between the drive recorder 2 and the first camera 3 and the second camera 4 has been disconnected). The size of 6592 bytes corresponds to the size when the image data created by the JPEG-IC used for this drive recorder is a completely black image. In this case, the JPEG-IC is set in advance to output a black image when there is no video input from the cameras 3 and 4. Therefore, when the black image is completely output continuously for a predetermined period (for example, 10 seconds), it can be determined that the connection between the drive recorder 2 and the first camera 3 and the second camera 4 is disconnected. it can. The CPU 24 turns on the LED 25 and generates a warning sound from the buzzer 26 to notify the user of the abnormality, stops the operation other than the LED 25 and the buzzer 26, and until the ACC switch 19 is turned off or the power switch 20 is turned off. Continue the operation. Note that the size of the 6592-byte image data to be detected and the monitoring period of 10 seconds are examples, and the present invention is not limited to this. If the JPEG-IC is configured to output a color other than black (for example, blue) when there is no video input, an abnormality may be detected with the blue image data size.

  The self-diagnosis process of the connection state of the first camera 3 and the second camera 4 may be determined not only when the drive recorder 2 is started but also when the drive recorder 2 is operating.

  As described above, the drive recorder 2 according to the present invention performs self-diagnosis at the time of startup or the like and confirms normal operation, so that it is possible to ensure the reliability of the recorded video information and operation information.

  FIG. 11 is a diagram showing a G value detection processing flow.

  The CPU 24 determines the G value based on the output of the acceleration sensor 5 according to the processing flow shown in FIG. Further, as will be described later, the CPU 24 determines whether or not the above-described recording condition relating to G detection is satisfied based on the determined G value according to the processing flow shown in FIG.

  First, the CPU 24 acquires the first axis output G1 and the second axis output G2 of the acceleration sensor 5 set in advance (S20, S21).

  Next, the CPU 24 detects the current speed of the vehicle 1 based on the vehicle speed pulse from the vehicle speed sensor 10 (S22).

  Next, the CPU 24 determines whether or not the road on which the vehicle 1 is currently traveling corresponds to a sharp curve based on the current position information of the vehicle 1 from the GPS receiver 9 (S23). The CPU 24 may acquire information on whether or not the vehicle is a sharp curve from a navigation system (not shown) connected to the drive recorder 2, and a storage unit (not shown) that stores map information in the drive recorder 2 itself. It is possible to obtain information on whether or not it is a sharp curve by comparing the map information with the current position information.

In S23, if it is determined that not the sharp curve, the output G1 of the first axis acquired in S20 and S21 and the absolute value of the combined value of the output G2 of the second axis ^{(G1 2 + G2 2) 0} · 5 Is a G value (S24).

If it is determined in S24 that the vehicle is a sharp curve, the correction value α based on the vehicle speed acquired in S22 is acquired, and the correction value α and the output G1 of the first axis acquired in S20 and S21 and the second based on the output G2 of the ^{shaft, (G1 2 + (| G2} | -α) 2) ^{0 - 5} and G values (S26). Here, for example, the correction value α can be determined to be 0.1 when the vehicle speed is less than 60 km / h and 0.2 when the vehicle speed is 60 km / h or more.

  In a sharp curve, the correction value α is subtracted from the absolute value of G2 which is the output in the left-right direction of the vehicle 1, although in a sharp curve, acceleration in the left-right direction is likely to occur, and an accident or the like has not occurred. This is because there is a possibility that the recording condition is satisfied by mistake. In the output G2, plus is set as the acceleration in the right direction, and minus is set as the acceleration in the left direction.

Based on the current position information from the GPS receiver 9, the G value is (G1 ² + (| G2 | −α) without determining whether the road on which the vehicle 1 is traveling is a sharp curve. ) ^{2) 0 - 5} may be determined based on. Further, the correction value α may be determined regardless of the vehicle speed. Furthermore, the sharp curve may be determined by other means such as a steering angle sensor.

  By determining the G value according to the above-described G value detection processing flow, it is possible to prevent unnecessary recording information from being recorded in the memory card 6 by unnecessarily many recording conditions being satisfied in the curve. It becomes possible.

  FIG. 12 is a diagram illustrating a flow for performing an output confirmation process of the acceleration sensor 5.

  In the example described above, it has been described that the first axis and the second axis of the acceleration sensor 5 are set in advance. However, the CPU 24 may be configured to independently reset the two axes set in advance. good. FIG. 12 shows a processing flow for that purpose.

  First, the CPU 24 determines whether or not the vehicle 1 has stopped (S30). Whether or not it is stopped can be determined, for example, when the G value obtained by the process flow of FIG. 11 is 0.1 G or less for 3 seconds or more. Alternatively, the vehicle speed sensor may determine that the vehicle has stopped when the continuous speed is equal to or lower than a predetermined speed (for example, 2 km / h).

  Next, the CPU 24 acquires the output G1 set as the first axis and the output G2 set as the second axis among the outputs from the acceleration sensor 5 immediately after the stop (S31), and the vehicle 1 The axis whose output is 0.2 G or more when the vehicle starts moving again after the stop is recognized as an axis parallel to the traveling direction (or the front-rear direction) of the vehicle 1 (S32).

  Next, in this determination, the CPU 24 stores, as history information, an axis recognized as an axis parallel to the traveling direction of the vehicle 1 in the second RAM 15 (S33).

  Next, the CPU 24 recognizes the output of the axis other than the axis certified in S32 as the second axis, that is, the output in the left-right direction of the vehicle 1 (S34), and ends the series of processes.

  The process shown in FIG. 12 is repeatedly performed every time it is determined that the vehicle 1 has stopped. Since the history information is collected when the processing flow shown in FIG. 12 is executed a predetermined number of times, axis recognition may be performed based on the history information. After the CPU 24 clearly specifies the left and right axial output of the vehicle 1 by the resetting of the axial direction shown in FIG. 12, as shown in FIG. 11, to prevent erroneous detection during curve running, Correction can be made so that a predetermined correction value α is subtracted from the absolute value of the output G2 of the second axis (the left-right direction of the vehicle) of the acceleration sensor 5. Such composite processing can further prevent erroneous detection during curve driving. The axis may be set at the start, not at the stop. In that case, what is necessary is just to judge that S30 detected that it became 5 km / h or more based on the vehicle speed, and started. Further, in S32, an axis that becomes 0.2 G or more immediately after it is determined to start may be determined as an axis parallel to the traveling direction of the vehicle 1. Further, the history information may be reset when the power to the drive recorder 2 is turned on, and information may be collected repeatedly every time the power is turned on.

  FIG. 13 is a diagram illustrating a processing flow of G detection, which is one criterion for establishing the recording condition.

  First, the CPU 24 takes a value equal to or greater than the second threshold (0.4G) after the G value detected by the processing flow of FIG. 11 once takes a value equal to or smaller than the first threshold (0.1G). (S40). In such a case, it is determined that the G detection recording condition is satisfied (S41). The first threshold value (0.1 G) and the second threshold value (0.4 G) are values set in advance for G detection. Further, only when a value greater than or equal to the second threshold value is taken after falling below the first threshold value is judged as the establishment of the recording condition, when a value greater than or equal to the second threshold value is detected continuously. This is because it is considered that there is often no need to record video information or the like due to newly established recording conditions such as an abnormality of the acceleration sensor 5 or a state in which the vehicle 1 rolls over.

  Next, as will be described later, the CPU 24 determines whether or not normal video information recording (12 seconds before the establishment of the recording condition and 8 seconds after the establishment of the recording condition) has been extended (S42).

  In S42, if the extension has not been made, the elapsed time since the previous recording condition was established is detected, and the next process proceeds according to the elapsed time (S43).

  In S43, if the time since the previous recording condition was satisfied is greater than 0 seconds and less than T1 seconds (for example, 4 seconds), new recording due to the establishment of the recording condition also extends the recording time of the video information. No (S44). That is, the establishment of the detected recording condition is ignored. If the recording conditions are considered to be a series of events such as a collision after sudden braking and the recording conditions are satisfied in a short time, recording video information etc. This is because it will be recorded.

  In S43, if the time since the previous recording condition was satisfied is T1 seconds (for example, 4 seconds) or more and less than T2 seconds (for example, 8 seconds), the recording condition is extended by a predetermined time (for example, 4 seconds). (S45). If the recording condition is satisfied again during the recording of the video information, and if the recording condition is further satisfied in the latter half of 8 seconds after the previous recording condition is satisfied, the video information recorded thereafter is reduced. To extend the recording of video information. As a result, one recording in the case of S45 is a total of 24 seconds, 12 seconds before and 12 seconds after the establishment of the recording condition.

  In S43, when the time since the last recording condition is satisfied is T2 seconds (for example, 8 seconds) or more, the new recording condition is satisfied as 12 seconds before and 8 seconds after the recording condition is satisfied. The video information and the like are recorded during this time (S46). Note that, in exceptional cases, even when the recording condition is satisfied for the first time after the drive recorder 2 is started, the video information and the like are recorded for 12 seconds before and 8 seconds after the recording condition is satisfied in S46. .

  If it is determined in S42 that the recording is already being extended (S45), the elapsed time from the previous establishment of the recording condition is further considered (S47).

  In S47, when the time since the last recording condition is satisfied is T2 seconds (for example, 8 seconds) or more and less than T3 seconds (for example, 12 seconds), the extension is not performed again (S48). That is, the establishment of the detected recording condition is ignored. This is because if the extension is continued continuously, recording of video information and the like related to one event will be excessively recorded for a long time.

  In S47, when the time since the last recording condition is satisfied is T3 seconds (for example, 12 seconds) or more, the new recording condition is satisfied between 12 seconds before and 8 seconds after the recording condition is satisfied. The video information and the like are recorded (S49).

  A specific example of recording video information and the like according to the processing flow of FIG. 13 will be described below with reference to FIGS.

  FIG. 14 is a diagram showing a recording example (1) of video information by G detection. FIG. 14A shows a graph of the G value 50 obtained by the processing flow of FIG. 11, and FIG. 14B shows video information that is cyclically recorded in the second RAM 15, FIG. 14C shows video information recorded on the memory card 6.

  At t0, after first falling below the first threshold for the first time, a G value greater than or equal to the second threshold is detected, and then after falling below the first threshold again, at t1, the second threshold or greater is exceeded. It is assumed that the G value is detected. Moreover, t0 to t1 is T2 seconds or more.

  In accordance with S46 in FIG. 13, the video information 52 for 12 seconds before and after 8 seconds is recorded as one event 53 on the memory card 6 by the establishment of the recording condition at time t0. Further, t1 is T2 seconds or more after the previous t0, and is not extended when t1 occurs. Therefore, according to S46 of FIG. 13, the recording conditions at t1 are satisfied, and 12 seconds before t1 and 8 seconds after t1. Is recorded as another event 55 in the memory card 6. The event 53 and the event 55 include overlapping video information as shown in FIG.

  FIG. 15 is a diagram showing a recording example (2) of video information by G detection. FIG. 15A shows a graph of the G value 60 obtained by the processing flow of FIG. 11, and FIG. 15B shows video information that is cyclically recorded in the second RAM 15, FIG. 15C shows video information recorded on the memory card 6.

  At t0, after first falling below the first threshold for the first time, a G value greater than or equal to the second threshold is detected, and then after falling below the first threshold again, at t1, the second threshold or greater is exceeded. It is assumed that after the G value is detected and then falls below the first threshold value again, at time t2, the G value equal to or more than the second second threshold value is detected. Further, t0 to t1 is less than T2 seconds, and t0 to t2 are T3 seconds or more.

  According to the establishment of the recording condition at t0 in accordance with S46 of FIG. 13, the video information 62 for 12 seconds before and after 8 seconds is recorded as one event 64 on the memory card 6. Since t1 is less than T2 seconds from the previous t0 and is not extended when t1 occurs, the video information 63 for 4 seconds is stored in the memory according to the establishment of the recording condition of t1 according to S45 of FIG. Recorded as an extension 65 on the card 6. Furthermore, since t2 is being extended and is T3 seconds or more from t0, according to S49 in FIG. 13, the video information 66 for 12 seconds before t2 and 8 seconds after t2 is obtained according to the establishment of the recording condition at t2. It is recorded as another event 67 in the memory card 6. As shown in FIG. 15B, the event 64 and the event 67 include overlapping video information.

  FIG. 16 is a diagram showing a recording example (3) of video information by G detection. FIG. 16A shows a graph of G value 70 obtained by the processing flow of FIG. 11, and FIG. 16B shows video information that is cyclically recorded in the second RAM 15, FIG. 16C shows video information recorded on the memory card 6.

  At t0, after first falling below the first threshold for the first time, a G value greater than or equal to the second threshold is detected, and then after again falling below the first threshold again, at t1, t2, t3 and t4, It is assumed that a G value equal to or greater than a threshold value of 2 is detected. Further, t0 to t1 are less than T1 seconds, t0 to t2 are less than T2 seconds, t0 to t3 are less than T3 seconds, and t0 to t4 are T3 seconds or more.

  According to the establishment of the recording condition at t0 in accordance with S46 of FIG. 13, the video information 72 for 12 seconds before and after 8 seconds is recorded as one event 74 on the memory card 6. Since t1 is less than T1 seconds, it is ignored according to S44 of FIG. Furthermore, t2 is less than T2 seconds from t0 and is not extended when t2 occurs, so that the video information 73 for 4 seconds is stored in the memory card 6 according to the establishment of the recording condition of t2 according to S45 of FIG. Is recorded as an extension 75. Furthermore, since t3 is being extended and is less than T3 seconds from t0, it is ignored according to S48 of FIG. Further, since t4 is being extended and is T3 seconds or longer from t0, according to S49 in FIG. 13, the video information 76 for 12 seconds before t4 and for 8 seconds after t4 is stored in the memory according to the establishment of the recording condition at t4. It is recorded on the card 6 as another event 77. The event 74 and the event 77 include overlapping video information as shown in FIG.

  FIG. 17 is a diagram showing a recording example (4) of video information by G detection. FIG. 17A shows a graph of G value 80 obtained by the processing flow of FIG. 11, and FIG. 17B shows video information that is cyclically recorded in the second RAM 15, FIG. 17C shows video information recorded on the memory card 6.

  At t0, after first falling below the first threshold for the first time, a G value greater than or equal to the second threshold is detected, and then after falling below the first threshold again, at t1 the second threshold or greater is exceeded. Although the G value is detected, the G value continuously shows a high numerical value.

  According to the establishment of the recording condition at t0 in accordance with S46 of FIG. 13, video information 81 and so forth for 12 seconds before and after 8 seconds are recorded as one event 82 on the memory card 6. Since t1 is less than T1 seconds, it is ignored according to S44 of FIG. Further, since it has not dropped below the first threshold value thereafter, even if a G value equal to or higher than the second threshold value is detected according to S40 in FIG. 13, it is not considered that the recording condition is satisfied. In the example of FIG. 17, for example, the sudden braking operation is performed at t0, but the collision cannot be avoided, the vehicle 1 rolls over at t1, and then the acceleration sensor 5 continues to output a high G value by rollover. Corresponds to the state.

  As described above with reference to FIGS. 13 to 17, even when a G value equal to or greater than a predetermined threshold is detected, when a recording condition is continuously satisfied, or a continuously high G value is obtained. Since the video information is controlled so that it is not unnecessarily recorded when it is detected, the memory card 6 having a predetermined capacity can be used efficiently.

  The voltage reduction process of the drive recorder 2 will be described with reference to FIGS.

  The voltage reduction process is a process performed to appropriately protect video information being recorded when the output voltage from the battery 21 is lowered due to damage of the vehicle 1 due to an accident or the like.

  FIG. 18 is a diagram showing a voltage reduction process flow (1).

  The CPU 24 constantly monitors whether or not the first reduced voltage signal S1 from the first detector 43 changes from H to L (S50). As described in FIG. 6, the first detection unit 43 changes the first reduced voltage signal S <b> 1 from H to L when the output voltage of the battery 21 decreases to 8.0 V or less.

  In S50, when the first reduced voltage signal S1 changes from H to L, the CPU 24 generates a warning sound from the buzzer 26 (S51).

  Next, the CPU 24 determines whether the recording condition is currently established and video information or the like is written to the memory card 6 (S52), and the time when the first reduced voltage is detected in S50 is the recording condition. It is determined whether or not a predetermined time (for example, 8 seconds) has elapsed since the establishment of (S53).

  If video information is being written and if a predetermined time has not elapsed since the recording condition was satisfied, writing to the memory card is interrupted, and video information from 10 seconds before the trigger occurrence until the trigger occurrence is recorded. At that time, the number of recorded sheets is reduced. The video information from the first 10 seconds before the first reduced voltage is detected until the first reduced voltage is detected is reduced to 5 images per second (usually 10 images per second) for backup to the memory card 6 only. A folder is created and written (S54). When the first voltage drop is detected, it is highly likely that it is difficult to acquire new video information after that. Record the video information acquired so far in the backup-dedicated folder so that information as far as possible can be obtained. Control is not lost. In addition, it is preferable to record the operation information together with the video information in a backup dedicated folder.

  If the predetermined time has passed in S53, no special backup processing is performed. This is because video information of the normal recording time (12 seconds before the recording condition is established and 8 seconds after the recording condition is established) has already been acquired, so that it can be recorded on the memory card 6 as usual. Because it is.

  Thereafter, the CPU 24 performs a power consumption reduction process for cutting off the power supply to the first camera 3, the second camera 4, the JPEG-IC constituting the image processing circuit 13, and the GPS receiver 9, and the planned memory card 6. The power for writing to the video information 6 is secured (S55). The power for performing the backup processing in S54 is configured to be secured by the backup battery 46.

  Next, after completing the backup process, the CPU 24 stops the watchdog timer, performs a reboot (S56), and ends a series of processes.

  FIG. 19 is a diagram showing a voltage reduction process flow (2).

  The CPU 24 constantly monitors whether or not the second reduced voltage signal S2 from the second detection unit 44 changes from H to L (S60). As described with reference to FIG. 6, the second detection unit 44 changes the second reduced voltage signal S <b> 2 from H to L when the output voltage of the first power supply circuit 40 (or the output voltage of the backup battery 46) decreases to 3.7 V or less. Change to

  In S60, when the second reduced voltage signal S1 changes from H to L, the CPU 24 determines the start time of the closed process (S61).

  FIG. 20 is a diagram illustrating a voltage drop state. A curve 90 in FIG. 20 indicates that the voltage decreases from 8.0 V to 3.7 V for T4 seconds (the time from the first voltage drop detection to the second voltage drop detection), and from 3.7 V to 3.0 V for T5 seconds ( 20 shows a case where it takes time from detection of the second voltage drop to reset signal output, and the curve in FIG. 20 shows T7 from 3.7 V to 3.0 V for T6 seconds until the voltage drops from 8.0 V to 3.7 V. It shows the case that took 2 seconds. Since the reset signal for preventing malfunction of the CPU 24 and the like is output from the third detection unit 45 at 3.0 V, it is important how long it takes for the reset signal to be output from the second reduced voltage detection. Become. As shown in FIG. 20, it is possible to give a rough prediction of the time from the second voltage drop detection to the output of the reset signal according to the time from the first voltage drop detection to the second voltage drop detection. . In addition, the closing process requires about 500 ms.

  Therefore, if the time until the voltage drops from 8.0 V to 3.7 V is 1 second or longer, it is considered that it takes some time until the reset signal is generated. When the closing process is started and the time until the voltage drops from 8.0 V to 3.7 V is less than 1 second, the reset signal is likely to be generated early. The close process was started. Note that the above time setting is an example, and is not limited thereto.

  Next, the CPU 24 starts the closing process at the start time determined in S61 (S62). The close process refers to a process for closing all files that are currently open, and recording of video information to the memory card 6 is thereby terminated. After the close process, writing to the memory card is prohibited. If the close process is not properly performed, the video information recorded in the file cannot be appropriately used later. Therefore, the close process can be performed even during the backup process shown in FIG. It is executed with interruption.

  Thereafter, after the closing process is completed, the CPU 24 stops the watchdog timer, reboots (S63), and ends the series of processes.

  By appropriately performing the voltage reduction process shown in FIGS. 18 to 20, as much as possible even when the battery 21 is damaged or the connection between the drive recorder 2 and the battery 21 is interrupted due to an accident or the like. Can be recorded on the memory card 6.

  FIG. 21 is a diagram showing a mode switching flow.

  The drive recorder 2 has an output port for connection to the display unit 30 and is configured to be able to verify the contents recorded on the memory card 6 on the spot when an accident or the like occurs. That is, the drive recorder 2 according to the present invention has a recording mode for recording video information and the like on the memory card 6 and a playback mode for reproducing the video information recorded on the memory card 6. A switching flow between the recording mode and the reproduction mode will be described with reference to FIG.

  First, when the CPU 24 detects that the open / close knob 31 of the drive recorder 2 is once opened (S70), the CPU 24 starts a boot program for initializing the drive recorder 2 (S71).

  Next, it is determined whether or not the memory card 6 is inserted into the I / F 11 and whether or not the memory card 6 is set to write prohibition (S72), and if so, the CPU 24 is nonvolatile. The program for the playback mode is downloaded from the readable ROM and activated, thereby operating the drive recorder 2 in the playback mode (S73). When the memory card 6 is set to write-protection, one of the connection terminals of the memory card 6 has a specific output, so that the memory card 6 writes to the CPU 24 via the I / F 11. It is possible to determine whether or not the prohibition is set.

  Next, the CPU 24 indicates that the drive recorder 2 is operating in the reproduction mode by the LED 25 and / or the buzzer 26 (S74), and ends the series of operations.

  On the other hand, if the memory card 6 is inserted into the I / F 11 in S72, but the memory card 6 is not set to write-protection, the CPU 24 downloads the recording mode program from the nonvolatile ROM and starts up. Thereby, the drive recorder 2 is operated in the recording mode (S75).

  That is, normally, the memory card 6 is inserted into the drive recorder 2 in a writable state, set to the recording mode, and the video information and the like are recorded by satisfying the recording condition as described above. However, when it is desired to verify the recorded contents on the spot due to an accident or the like, the memory card 6 is temporarily removed, the memory card 6 is set to write-protection, and then inserted into the drive recorder 2 again. It is possible to change to a playback mode in which recorded video information can be played back. If the drive recorder 2 and the display unit 30 are not connected, or if the display unit 30 is damaged, a portable display device may be connected to the output slot of the drive recorder 2. Also, the method for setting the playback mode is not limited to this. For example, various methods are conceivable, such as shifting to the playback mode if the photographing switch 8 is operated for a predetermined time within a predetermined time after the power is turned on, and shifting to the recording mode if not operated.

  Next, a video information playback method in the playback mode will be described.

  In S74 in FIG. 21, after the LED 25 and the buzzer 26 indicate that the drive recorder 2 is operating in the playback mode, when the user presses the shooting switch 8, the buzzer 26 stops and the event recorded last is displayed. Playback starts. If fifteen events have been recorded on the memory card 6 at this time, the last fifteenth event is started to be played and recorded on the display unit 30 as usual (if not extended) ) Video information for 20 seconds is displayed. It is preferable that the display unit 30 displays, together with the video information, at least what number event the video information is and the time when the recording condition is satisfied.

  If the shooting switch 8 is pressed again during the reproduction of the video information of the event, the reproduction is stopped. Further, when the photographing switch 8 is pressed again while the reproduction is stopped, the reproduction is resumed from one second before the stop point. Further, after the reproduction of the video information related to one event is completed, the state is maintained, and when the photographing switch 8 is pressed again, the reproduction of the video information related to the same event is resumed. Further, when the photographing switch 8 is pressed for a long time, reproduction of video information relating to the next event, that is, the event recorded immediately before is started. By continuing to press the shooting switch 8 for a long time, video information relating to all events recorded in the memory card 6 can be reproduced. The above is a device for effectively using the photographing switch 8 which is only one operation means provided in the drive recorder 2. However, the drive recorder 2 can be provided with other operation means.

  In addition, when the photographing switch is not operated for a certain period of time (for example, 30 seconds or more) after entering the playback mode, the CPU 24 preferably restarts by performing the boot process (S7) again. Thereby, after restarting, the user can be prompted to cancel the playback mode by sounding the buzzer (S) in the playback mode.

  FIG. 22 is a diagram showing the playback order.

  As shown in FIG. 22, it is possible to control the playback from the last recorded 15 event (S80) to the first captured first event (S85) by long pressing the shooting switch 8. It is. If the shooting switch 8 is pressed and held again during playback of the first event, playback of the 15th event is started.

  The use of the memory card 6 in the playback device 400 will be described.

  FIG. 23 is a diagram showing a flow of an operation example of the memory card 6.

  First, the user sets the memory card 6 to be used to be writable, inserts it into the I / F 411 of the playback device 400, and initializes the card (S1). In the initialization of the card, the data previously recorded in the memory card 6 is deleted by the CPU 424, and the ID of the user who operates using the memory card 6 (for example, taxi crew) is the memory card 6 Is written at a predetermined address.

  Next, when the user starts the operation of the vehicle 1 (for example, when the taxi crew starts the day shift work (7:45 to 17:15)), the user sets the memory card 6 that is set to be writable and initialized. The data is inserted into the I / F 11 of the drive recorder 2 arranged in the vehicle 1 and data recording is started with the drive recorder 2 as a recording mode (S2). As described above, the CPU 24 records video information and operation information for a predetermined period (for example, 20 seconds) in the memory card 6 when the recording condition is satisfied.

  Next, when the operation of the vehicle 1 ends (for example, when a taxi crew member ends the day shift work), the memory card 6 for which data recording has been completed is taken out from the I / F 11 of the drive recorder 2. The user further inserts the memory card 6 into the I / F 411 of the playback device 400, and the video information, operation information, memory card ID, user ID, and the like recorded on the memory card 6 are displayed on the playback device 400 side. (S3).

  On the playback device 400 side, the CPU 424 reads the video information, operation information, memory card ID, and user ID recorded in the memory card 6 corresponding to one operation of one vehicle. In the playback device 400, it is also possible to individually analyze data for each memory card, and after reading data corresponding to a plurality of operations of a plurality of vehicles from the plurality of memory cards 6, the data analysis is summarized. It is also possible to do this. Further, one memory card 6 may be used for a plurality of vehicles or used for a plurality of operations.

  The display of the visual field area in the playback apparatus 400 will be described.

  In the drive recorder 2, the first camera 3 and the second camera 4 acquire the video information, but the field of view in which the driver actually looks around is different from the inherent field of view of the camera.

  A person's field of view refers to a range in which a person can look around without changing the position of the eyes. Normally, the field of view when the vehicle 1 is stationary is about 200 degrees in the left-right direction and about 112 degrees in the vertical direction when viewing both eyes. It has been broken. Further, when the speed of the vehicle 1 changes, the vicinity is blurred and only the distance is seen, so that the driver's field of view is narrowed. Furthermore, since the field of view tends to narrow with age, the field of view differs between older drivers and younger people. It is said that the field of view of an elderly person (for example, 60 years or older) is narrower than that of a young person (for example, less than 60 years). As an example, it can be considered that the visual field range is narrowed by 20%. FIG. 24 is a diagram showing a correspondence table of the viewing angle in the horizontal direction and the vertical direction and the speed of the vehicle 1 used in the playback device 400. An area defined by the viewing angle in the horizontal direction and the vertical direction, that is, an area where the driver can see without moving his / her eyes is defined as a viewing area.

  In view of this, in the playback device 400, when playing back video information acquired by a drive recorder, the visual field range that the driver actually sees is specified, and how an accident or the like occurs is verified. It is possible. In addition, by specifying the visual field range, it is possible to use it for safety education for the driver.

  In the playback device 400, when the CPU 424 displays video information regarding each event on the display unit 440 based on the control program 417, the speed of the vehicle is detected from the vehicle speed data in the operation information, and the correspondence table shown in FIG. The viewing angle is obtained from (recorded as a map in the playback device 400), and the viewing range can be displayed on the screen.

  Note that the playback apparatus 400 has the following five visual field range playback modes, and the user can play back video information in one of the modes by operating the operation unit 430. ing.

    1. Fixed angle mode: Only the viewing area corresponding to the viewing angle in the horizontal direction and the vertical direction specified by the operation unit 430 is displayed.

    2. Vehicle speed mode at the moment of detection: Only the viewing area corresponding to the viewing angle in the horizontal direction and the vertical direction corresponding to the vehicle speed when the recording condition is satisfied is displayed.

    3. Vehicle speed mode at the reproduction position: The visual field areas corresponding to the visual angle in the horizontal direction and the vertical direction corresponding to the vehicle speed for each still image to be reproduced are sequentially displayed.

    4). Fixed speed mode: Only the viewing area corresponding to the viewing angle in the horizontal direction and the vertical direction corresponding to the speed designated by the operation unit 430 is displayed.

    5). Normal mode: Does not display the field of view.

  In the vehicle speed mode (2) at the moment of detection, the vehicle speed mode (3) at the reproduction position, and the fixed speed mode (4), the combination with the elderly correction is possible.

  FIG. 25 is a diagram showing an example of a screen for displaying video information recorded on the memory card 6. The screen display process of FIG. 25 and the process based on the user operation on the screen are performed by the CPU 424 in accordance with the control program 417 based on the data stored in the card information storage unit 460. To display.

  As shown in FIG. 25, on the screen 140 displayed on the display unit 440, the ID number data 141 of the memory card 6, the time information 142 included in the operation information, the type information 143 indicating the established recording conditions, the location information Latitude data 144, longitude data 145 of position information, G value 146 obtained according to the flow of FIG. 11, driving situation information 147 when a displayed still image is taken, first camera 3 The area 148-1 for sequentially displaying the still images captured in step 148, the area 148-2 for sequentially displaying the still images captured by the second camera 4, and the still images captured by the first camera 3 and the second camera 4 are controlled. Operation buttons 149 (rewind, playback, stop, fast forward), vehicle speed information 150 when the displayed still image is taken, and the type of the selected visual field range playback mode are displayed. That region 151, like area 152 showing a correction there-without elderly are displayed.

  In the region 148-1, a first frame 153-1 indicating the visual field range and a second frame 153-2 indicating the visual field range subjected to the elderly correction are displayed. Similarly, in the region 148-2, a first frame 154-1 indicating the visual field range and a second frame 154-2 indicating the visual field range subjected to the elderly correction are displayed. In the example of FIG. 25, the elderly person correction is performed as shown in the area 152, but the second frames 153-2 and 154-2 are not displayed when the elderly person correction is not performed. Note that the visual field range can be displayed more clearly by changing the display method between the first frame and the second frame.

  In the example of FIG. 25, since the vehicle speed mode at the moment of detection is selected as shown in a region 151, the horizontal viewing angle corresponding to the vehicle speed (for example, 40 km / h) at the time when the recording condition is satisfied. The viewing area corresponding to (140 degrees) and the viewing angle in the vertical direction (78 degrees) is displayed in the area 148-1 as the first frame 153-1 (see FIG. 24). Also, it corresponds to the horizontal viewing angle (112 degrees) and the vertical viewing angle (63 degrees) when the elderly person is corrected, corresponding to the vehicle speed (for example, 40 km / h) when the recording condition is satisfied. The visual field region thus displayed is displayed in the region 148-1 as the second frame 153-2 (see FIG. 24). The same applies to the region 148-2.

  On the screen 140 shown in FIG. 25, the user controls the operation button 149 so that 100 still images captured by the first camera 3 for 100 seconds and 100 images captured by the second camera 4 for 10 seconds are displayed. Still images are displayed while sequentially switching to the display areas 148-1 and 148-2. At the same time, information corresponding to the displayed still image is displayed in the display / input areas 141 to 147 and 150. Note that the screen 140 shown in FIG. 25 is an example, and other screen configurations can be selected.

  In the present embodiment, as shown in FIG. 25, since the visual field range is superimposed on the video information recorded on the memory card 6, the area where the driver is actually in the visual field and the other area are not. It is possible to verify the video information acquired by the drive recorder while distinguishing. In addition, when the visual field range is corrected according to the age, the visual field range of the driver can be made closer to the actual situation.

  In FIG. 25, the recording conditions and the video information are displayed on the same screen. However, it is not always necessary to display both on the same screen. For example, an operation button for displaying the recording conditions is displayed on the same screen as the image. When the operation button is operated, the recording condition may be displayed as a separate window.

  FIG. 26 is a diagram showing a driving status classification process flow.

  As described above, video information relating to an event when a predetermined recording condition is satisfied is recorded in the memory card 6. However, it is important to classify which operation is performed and the recording condition is satisfied when the recorded video information or the like is verified in the reproducing apparatus 400. Therefore, the playback device 400 has a function of automatically classifying each event according to the processing flow shown in FIG. 26 using the recorded video information and operation information.

  There are five driving situations for classification: “sudden start”, “sudden brake”, “normal brake”, “left sudden handle”, and “right sudden handle”.

  First, the CPU 424 selects a predetermined event, and the G1 value corresponding to each of the 30 still images before and after the recording condition is satisfied for one camera (parallel to the front-rear direction of the vehicle 1 in the acceleration sensor 5). Output), G2 value (output of the axis parallel to the left and right direction of the vehicle 1 in the acceleration sensor 5), and vehicle speed data are acquired as sample data (S90).

  Next, for each sample, the CPU 424 applies the least square method to the values at the 10 points before and after the sample, and calculates the slope of the change in each sample (S91). Further, the peak of the slope waveform of each sample before and after the recording condition is established is specified (S92).

  Next, the CPU 424 specifies the driving situation of the target event from the relationship between the peak master file that specifies each predetermined driving situation described later and the peak obtained in S92 (S93), and a series of The process ends. The driving situation specified for each event is displayed when the video information regarding each event is displayed on the display unit 440 (see region 147 in FIG. 25). Further, the specified driving situation is displayed as an icon set for each driving situation, for example, in the upper right corner of the image so as to overlap the image. As a result, the driving situation of the event being reproduced can be grasped appropriately. You can also search and narrow down events by driving status classification. Thereby, it is possible to extract only the driving situation to be confirmed and reproduce the image.

  FIG. 27 is a diagram showing sample rows and the like. The vertical axis indicates the G1 value, the horizontal axis indicates time, and the time point at t = 0 corresponds to the time when the recording condition is satisfied.

  FIG. 27 shows a sample string 200 of G1 values related to the predetermined event acquired in accordance with S90 of FIG. A waveform 210 is an inclination waveform obtained by connecting the inclinations of the samples constituting the sample row 200, which is obtained in accordance with S91 of FIG. Further, a point 220 indicates the peak of the waveform 210 before the recording condition is satisfied, and a point 230 indicates the peak of the waveform 210 after the recording condition is satisfied.

  FIG. 28 is a diagram illustrating an example of a peak master file.

  As shown in FIG. 28, the ranges that can be taken by the peak values (see S92 in FIG. 26) relating to the G1 value, the G2 value, and the vehicle speed corresponding to the five driving situations described above, that is, the upper limit and the lower limit are when the recording condition is satisfied. The driving situation is specified by specifying in which upper and lower limits of each driving situation in FIG. 28 the peak value specified in S92 of FIG. 26 is included (see FIG. 26). S93). In FIG. 28, the shaded portion is the portion where the peak is defined, and the peak value is not defined in other locations.

  For example, in the example of FIG. 27, assuming that the value of the point 220 of the waveform 210 relating to the G1 value is 1.5 and the value of the point 230 is −1.5, the “sudden braking” is based on the peak master file of FIG. It is judged that it was the driving situation.

  Note that it is preferable that each value defined in the peak master file shown in FIG. 28 can be corrected using the editing screen 160 displayed on the display unit 440 shown in FIG. Note that the edit screen 160 shown in FIG. 29 is for correcting conditions relating to a sudden start. The values defined in the peak master file shown in FIG. 28 are examples, and other values can be adopted, and the vehicle speed can be taken into account as a condition.

  FIG. 30 is a diagram showing a typical pattern indicating the driving situation of sudden start.

  30A shows a G2-value sample string 300, FIG. 30B shows a G1-value sample string 301, and FIG. 30C shows a vehicle speed sample string 302. FIG. In any of the figures, the time when the recording condition is satisfied is T = 0.

  An inclination waveform of each sample is obtained from the G1 value, G2 value, and vehicle speed sample sequences, and the driving situation is determined based on the peak values before and after the recording conditions are established. In the case of FIG. 30, the slope waveform 303 of each sample is obtained from the G1 value sample string 301, and the peak value 304 before the recording condition is satisfied is between -0.2 and -2.0, so that it is abrupt. It was decided to start.

  FIG. 31 is a diagram showing a typical pattern indicating the driving situation of the sudden brake.

  31A shows a G2-value sample row 310, FIG. 31B shows a G1-value sample row 311, and FIG. 31C shows a vehicle speed sample row 312. In any of the figures, the time when the recording condition is satisfied is T = 0.

  An inclination waveform of each sample is obtained from the G1 value, G2 value, and vehicle speed sample sequences, and the driving situation is determined based on the peak values before and after the recording conditions are established. In the case of FIG. 31, the slope waveform 313 of each sample is obtained from the G1 value sample sequence 311 and the peak value 314 before the recording condition is established is between 3.0 and 0.5. Since the peak value 315 after establishment was between -0.4 and -3.0, it was determined that the brake was sudden.

  FIG. 32 is a diagram showing a typical pattern indicating the driving situation of the normal brake.

  FIG. 32A shows a sample column 320 of G2 values, FIG. 32B shows a sample column 321 of G1 values, and FIG. 32C shows a sample column 322 of vehicle speed. In any of the figures, the time when the recording condition is satisfied is T = 0.

  An inclination waveform of each sample is obtained from the G1 value, G2 value, and vehicle speed sample sequences, and the driving situation is determined based on the peak values before and after the recording conditions are established. In the case of FIG. 32, the slope waveform 323 of each sample is obtained from the G1 value sample string 321 and the peak value 324 before the recording condition is established is between 0.5 and 0.05. Since the peak value 325 after establishment was between -0.05 and -0.5, it was judged as a normal brake.

  FIG. 33 is a diagram illustrating a typical pattern indicating the driving situation of the left sudden handle.

  33A shows a G2-value sample row 330, FIG. 33B shows a G1-value sample row 331, and FIG. 33C shows a vehicle speed sample row 332. In any of the figures, the time when the recording condition is satisfied is T = 0.

  An inclination waveform of each sample is obtained from the G1 value, G2 value, and vehicle speed sample sequences, and the driving situation is determined based on the peak values before and after the recording conditions are established. In the case of FIG. 33, the slope waveform 333 of each sample is obtained from the G2-value sample string 330, and the peak value 334 before the recording condition is satisfied is between 2.0 and 0.1, so the left abrupt handle It was judged.

  FIG. 34 is a diagram showing a typical pattern showing the driving situation of the right-hand steering wheel.

  34A shows a G2-value sample row 340, FIG. 34B shows a G1-value sample row 341, and FIG. 33C shows a vehicle speed sample row 342. In any of the figures, the time when the recording condition is satisfied is T = 0.

  An inclination waveform of each sample is obtained from the G1 value, G2 value, and vehicle speed sample sequences, and the driving situation is determined based on the peak values before and after the recording conditions are established. In the case of FIG. 34, the slope waveform 343 of each sample is obtained from the G2 value sample string 340, and the peak value 344 before the recording condition is established is between −0.1 and −2.0, and so on. It was judged as a sudden handle.

  As described above, with respect to each event, it is possible to classify the driving situation when video information or the like is recorded, so that the playback device 400 can perform data verification more quantitatively. It was.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Drive recorder 3 1st camera 4 2nd camera 5 Acceleration sensor 6 Memory card 7 Microphone 8 Shooting switch 9 GPS receiver 10 Vehicle speed sensor 11 Interface 12 Video switch 13 Image processing circuit 14 1st RAM
15 Second RAM
16 Nonvolatile ROM
17 Control Program 18 Indicator Light 19 Accessory Switch 20 Power Switch 21 Battery 22 Power Control Circuit 24 CPU
25 LED
26 Buzzer 27 Open / close switch 28 RTC
DESCRIPTION OF SYMBOLS 30 Display part 31 Opening / closing knob 40 1st power supply circuit 41 2nd power supply circuit 42 3rd power supply circuit 43 1st detection part 44 2nd detection part 45 3rd detection part 46 Backup battery 400 Playback apparatus 424 CPU
430 Operation unit 440 Display unit 450 Map information storage unit 460 Card information storage unit

Claims (3)

An acceleration sensor for detecting a first acceleration in the traveling direction of the vehicle and a second acceleration in the lateral direction of the vehicle;
Determining means for determining whether or not the vehicle is running on a curve;
When it is determined by the determination means that the vehicle is traveling on a curve, a combined acceleration is obtained based on a value obtained by subtracting a correction value from the absolute values of the first acceleration and the second acceleration. A control unit that records video information received from the imaging unit in a recording element when a threshold value is exceeded;
The drive recorder characterized by having. A vehicle speed sensor for detecting the vehicle speed of the vehicle;
The drive controller according to claim 1 , wherein the control unit changes the correction value based on a vehicle speed detected by the vehicle speed sensor. The drive recorder according to claim 1 or 2 , wherein the determination unit determines whether or not the vehicle is traveling on a curve based on current position information of the vehicle or a steering angle of the vehicle.

Images