JP2018055630A - drive recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive recorder capable of recording for a long period of time.SOLUTION: A drive recorder 10 of the present invention includes a drive recorder main body 20 having: an acceleration sensor 22 that detects impact of a vehicle; a camera unit 28 that can image an exterior and/or an interior of the vehicle; a USB I/F 42 to which a USB cable 16 connected to an external terminal can be connected; and a control unit 34 that can change impact sensitivity of the acceleration sensor 22 on the basis of a detection signal in a short-circuit state or an open state of a signal line of the USE cable 16, the detection signal being inputted through the USB I/F 42.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a drive recorder that records a driving situation or a parking situation of a vehicle.

Drive recorders that record vehicle driving conditions or parking conditions are used for purposes such as accident analysis, technical confirmation of safe driving, and crime prevention.
Conventionally, as such a drive recorder, Patent Document 1 discloses a technique for setting an appropriate acceleration sensor detection threshold by switching between a driving mode and a parking mode by an ACC (accessory) signal from a vehicle, A technique is disclosed that enables long-time recording by reducing the frame rate of a captured image or increasing the compression rate of the captured image stored in the storage unit when the ACC signal is OFF in the parking mode. .

JP 2010-128610 A

  However, the drive recorder disclosed in Patent Document 1 uses a dedicated cable for connection to the ACC switch. For this reason, for example, a general-purpose USB cable other than the dedicated cable cannot be used. Further, a separate USB terminal is required to directly transfer the recorded data recorded in the drive recorder main body to an external PC (personal computer) and the drive recorder main body.

  In addition, there is a limit to long-time recording only by changing the frame rate and compression rate of the captured image after the ACC signal is turned off.

  In view of the above-described problems of the conventional technology, an object of the present invention is to provide a drive recorder that can be connected to an ACC switch of a vehicle with a versatile connection cable. Another object of the present invention is to provide a drive recorder that can realize long-time recording.

In order to solve the above problems, as a first means, the present invention relates to an acceleration sensor for detecting vehicle vibration, a camera unit capable of photographing the outside or / and inside of the vehicle, and a USB connected to an external terminal. Control capable of changing the impact sensitivity of the acceleration sensor based on a USB I / F to which a cable can be connected and a control signal in a short or open state of the signal line of the USB cable input via the USB I / F And a drive recorder having a drive recorder body.
According to the first means, the drive recorder main body can determine the ON / OFF state of the ACC signal via a versatile USB cable, and can determine that the vehicle is stopped. Therefore, it is not necessary to add a connector such as a dedicated cable for connection with a vehicle that has been used conventionally. Also, recorded data can be easily output to an external PC or the like via the USB I / F.

As a second means for solving the above-mentioned problem, the present invention provides a connection between the drive recorder main body and the ACC switch of the vehicle, and when the ACC signal from the ACC switch is detected, the signal line is short-circuited. Or a signal line for outputting, to the USB I / F, one of the control signals in the open state and the other control signal in the shorted or open state of the signal line when the ACC signal from the ACC switch is not detected. An object of the present invention is to provide a drive recorder including a parking mode device having a control unit.
According to the second means, information on the ON / OFF state of the ACC signal can be output from the USB I / F using the USB D− / D + signal. As a result, there is no need to add a connector such as a dedicated cable for connection to a vehicle that has been conventionally used.

As a third means for solving the above-mentioned problem, the present invention is characterized in that the drive recorder main body measures a predetermined time after receiving a control signal of the signal line short or open state from the parking mode device. The control unit is configured to receive only a signal after a predetermined time has elapsed by the timer and operate only the acceleration sensor, and after the acceleration sensor detects an impact, starts recording the camera unit. A drive recorder according to claim 2 is provided.
According to the third means, since the operation other than the acceleration sensor of the drive recorder main body is stopped, the power consumption in the low power consumption mode can be reduced as much as possible.

  According to the present invention configured as described above, it is possible to determine the ON / OFF state of the ACC signal using a versatile USB cable signal line. For this reason, it is not necessary to use a dedicated cable for connection with the ACC switch of the vehicle.

1 is a schematic configuration diagram of a drive recorder of the present invention. It is a block diagram of a drive recorder main body. It is a block diagram of a parking mode apparatus. It is a processing flowchart of the drive recorder of this invention. It is explanatory drawing of recording data. It is a processing flow figure of a low power consumption mode. It is the structure schematic of the parking mode apparatus of a modification. It is a block diagram of the parking mode apparatus of a modification. It is the structure schematic of a conversion adapter.

  Embodiments of the drive recorder of the present invention will be described below in detail with reference to the accompanying drawings.

[Drive recorder 10]
FIG. 1 is a schematic configuration diagram of a drive recorder of the present invention. FIG. 2 is a block diagram of the drive recorder body. FIG. 3 is a block diagram of the parking mode device. As shown in the figure, the drive recorder 10 of the present invention has a drive recorder body 20, a parking mode device 50, and a USB cable 16 that connects the drive recorder body 20 and the parking mode device 50 as main components.

[Drive recorder body 20]
The drive recorder main body 20 includes an acceleration sensor 22, a microphone 24, a communication unit 26, a camera unit 28, a photographing control unit 30, a RAM 32, a control unit 34, a memory 36, an I / F 38, and a memory card. 40, USB I / F 42, power supply control circuit 44, D− / D + detection unit 46, external battery 48, and timer 67.

The acceleration sensor 22 is a sensor that detects vibration such as an impact acting on the vehicle, and is configured to be able to output a measurement value to a control unit 34 described later.
The microphone 24 records the sound of the vehicle, and is configured to be able to output the recorded data to the control unit 34 described later.
The communication unit 26 is configured to be able to communicate with an external communication terminal (for example, a smartphone, a mobile terminal, etc.) via wireless communication.

The camera unit 28 shoots the inside or / and outside of the vehicle, and is configured to output a video signal to the shooting control unit 30 described later.
The imaging control unit 30 receives the video signal output from the camera unit 28, performs predetermined image processing, and outputs it to the control unit 34.
The RAM 32 cyclically records the video signal after the image processing.

The control unit 34 executes a drive record mode, which will be described later, based on a control signal in a short state of the D− / D + signal line output from the parking mode device 50 when detecting the ACC signal from the ACC (accessory) switch 12. To do. Here, the open state and the short state of the present embodiment are states as a result of determining whether or not the impedance between D− / D + is a threshold value of 200Ω or less, for example.
When the ACC signal from the ACC switch 12 is not detected, a parking mode described later is executed based on the control signal in the open state of the D− / D + signal line.
The memory 36 stores a determination threshold (a value when an impact such as a collision occurs, a value when a vibration occurs during parking, etc.) used for comparison with the measured value of the acceleration sensor 22.

The memory card 40 stores a video signal or audio signal that needs to be recorded via the I / F 38.
The USB I / F 42 is an interface such as a socket to which a USB cable can be connected, for example.
The power control circuit 44 adjusts the power supplied from the USB I / F 42 to a predetermined voltage.

The D− / D + detection unit 46 outputs a control signal from the ACC switch 12 in a short state of the D− / D + signal line output from the parking mode device 50 when the ACC signal from the ACC (accessory) switch 12 is detected. When the ACC signal is not detected, the control signal in the open state of the D− / D + signal line output from the parking mode device 50 is detected.
The external battery 48 supplies power to the drive recorder main body 20 from the outside.

The timer 67 measures a predetermined time after reception when a control signal in an open state of a signal line is received from the parking mode device 50 described later. With this timer 67, the time for shifting from the parking mode when the vehicle is stopped to the low power consumption mode can be arbitrarily set and changed.
In addition, when the timer 67 receives the control signal in the short state of the signal line from the parking mode device 50, the timer 67 measures a predetermined time after the reception and shifts from the parking mode when the vehicle is stopped to the low power consumption mode. You may comprise so that setting can be arbitrarily changed in time.

[Parking mode device 50]
The parking mode device 50 is a device that is connected between the ACC switch of the vehicle and the drive recorder main body 20 and monitors the ON / OFF state of the ACC of the vehicle.
The parking mode device 50 includes a voltage detection unit 52, a setting switch 54, a delay control unit 56, an input control unit 58, a voltage conversion unit 60, a D− / D + control unit 62, a USB I / F 64, and an ON. / OFF switch 66 is provided.

The voltage detection unit 52 detects a vehicle battery voltage supplied from the vehicle battery 14.
The setting switch 54 sets a predetermined threshold value for the vehicle battery voltage.
The delay control unit 56 outputs a signal after elapse of a preset time after the ACC signal is turned off.

The ON / OFF switch 66 is a changeover switch that turns ON / OFF only the parking mode of the parking mode device 50 body manually.
The input control unit 58 controls the input of the vehicle battery voltage based on a signal from the delay control unit 56 or the ON / OFF switch 66.
The voltage converter 60 converts the vehicle battery voltage into a predetermined voltage.

The D− / D + control unit 62 serving as the signal line control unit detects the control signal in the short state of the D− / D + signal line when detecting the ACC signal from the ACC switch 12 and detects the ACC signal from the ACC switch 12. When not, a control signal in an open state of the D− / D + signal line is output to the USB I / F 64.
The USB I / F 64 is an interface such as a socket to which a USB cable can be connected, for example.

The battery 14 is a power supply line for connecting the parking mode device 50 to a wiring capable of detecting power supply and battery voltage from the vehicle battery.
The ACC switch 12 is a detection line for connecting to a wiring capable of detecting the ACC of the vehicle.

[USB cable 16]
A USB (Universal Serial Bus) cable 16 is a versatile cable. The versatile USB cable 16 of the present embodiment can connect the drive recorder main body 20 and the parking mode device 50, and can also connect the drive recorder main body 20 and an external terminal such as an external PC.

[Action]
The operation of the drive recorder of the present invention having the above configuration will be described below. FIG. 4 is a processing flowchart of the drive recorder of the present invention. FIG. 5 is an explanatory diagram of recorded data.
The parking mode device 50 of the drive recorder 10 is connected to the ACC switch 12 and the vehicle battery 14 of the vehicle. The USB I / F 64 of the parking mode device 50 and the USB I / F 42 of the drive recorder main body 20 are connected by the USB cable 16.

The vehicle battery voltage is supplied from the vehicle battery 14 to the parking mode device 50. The ACC signal ON / OFF is detected from the ACC switch 12 of the vehicle (S1).
When the ACC signal is ON, the D− / D + detection unit 62 outputs a D− / D + short signal to the USB I / F 64 (S2). Next, power is output to the USB I / F 64 via the voltage conversion unit 60.

If the ACC signal is OFF, whether or not the vehicle battery voltage is higher than a preset threshold after the lapse of the specified time (S3) through the delay control unit 56 from the time when the ACC signal is detected to be OFF A determination is made (S4). When the vehicle battery voltage is lower than the threshold, the parking mode device 50 does not supply power (S5).
On the other hand, when the vehicle battery voltage is higher than the threshold, the D− / D + detection unit 62 outputs a D− / D + open signal to the USB I / F 64 (S6).
Next, power is supplied to the USB I / F 64 via the voltage converter 60.

When the drive recorder main body 20 detects the D− / D + short (connection) signal via the USB cable 16, it operates in the drive recorder mode (operation mode) (S7).
The controller 34 switches to the set value of the acceleration sensor 22 in the drive mode (S8). The set value of the acceleration sensor 22 in the drive mode is a value capable of detecting vibration such as a collision during driving, and can be set to 0.1 to 2.0 G, for example.

The presence or absence of a reaction of the set threshold value of the acceleration sensor 22 is detected (S9).
When the measured value of the acceleration sensor 22 is larger than the set threshold value, recording in the drive recorder mode is performed (S10). In the drive recorder mode, recording data is always held as a buffer in the memory 36 for a certain period of time. When the acceleration sensor 22 detects a shock or the like and exceeds a predetermined set value, the recorded data in the buffer of the memory 36 (before the impact) and the recorded data taken after the impact detection (after the impact) are combined. One recording data is recorded on the memory card 40.

Further, when a D− / D + open signal is received via the USB cable 16, the parking mode is switched (S11).
The controller 34 switches to the set value of the acceleration sensor 22 in the parking mode (S12). The set value of the acceleration sensor 22 in the parking mode is a value capable of detecting vibration during parking, and is a value smaller than the value in the drive mode, and can be set to 0.01 to 1.0 G, for example.
The presence / absence of a reaction of the set threshold value of the acceleration sensor 22 is detected (S13).

When the measured value of the acceleration sensor 22 is larger than the set threshold value, parking mode recording is performed (S14). In the parking mode, recording data is always held as a buffer in the memory 36 for a certain period of time as in the drive recorder mode. If the acceleration sensor 22 detects an impact such as a hit or escape, and exceeds a predetermined set value, the recorded data in the buffer in the memory 36 (before the impact) and the recorded data taken after the impact detection are combined into one recording. Recorded in the memory card 40 as data.
According to such a drive recorder 10, the drive recorder main body 20 can determine the ON / OFF state of the ACC signal via the signal line of the versatile USB cable 16, and the vehicle is being driven or stopped. You can easily determine that there is.

Next, the operation of the low power consumption mode will be described below. FIG. 6 is a processing flowchart of the low power consumption mode.
When the ACC signal from the ACC switch 12 of the vehicle is switched from ON to OFF, such as when the vehicle is parked (S20), the operation delay unit 56 of the parking mode device operates after a predetermined time has elapsed since the ACC signal was turned OFF ( S21), a USB I / F D− / D + open signal is output (S22).

After receiving the D− / D + open signal from the parking mode device, the drive recorder body 12 switches to the parking mode (S23), and determines whether or not a predetermined time has elapsed by the timer 67 (S24).
After the predetermined time has elapsed (YES), it is determined whether or not to shift to the low power consumption mode (S25).

When the mode is shifted to the low power consumption mode, only the acceleration sensor 22 is operated, and otherwise, the sleep (standby) state is set (S26). When the operating acceleration sensor 22 detects vibration such as theft or contact accident in the parked vehicle, the measured value is output to the control unit 34, and the state shifts from the sleep state to the operating state. Start shooting.
On the other hand, when the mode is not shifted to the low power consumption mode (NO), for example, when recording is not performed during parking, the operation of the apparatus is stopped (S27).

  According to the low power consumption mode of such a drive recorder, only the acceleration sensor is operated until the vibration of the parked vehicle is detected, such as a contact accident, and the rest is put in the sleep (standby) state. Therefore, the power consumption of the entire apparatus is small, and the load on the vehicle battery can be reduced.

A conversion adapter 70 can be used instead of the parking mode device 50. FIG. 9 is a schematic configuration diagram of the conversion adapter. As illustrated, the conversion adapter 70 includes a USB I / F 72, a power conversion / control unit 74, and a D− / D + short unit 76, and is configured to be connectable to the ACC switch 12.
The USB I / F 72 is an interface such as a socket to which the USB cable 16 can be connected.
The power conversion / control unit 74 performs conversion control on the power from the ACC switch 12 and outputs the power via the USB I / F 72.
The D− / D + short unit 76 outputs a D− / D + short signal via the USB I / F 72.

  The D− / D + of the USB I / F 72 of the conversion adapter 70 having such a configuration is in a short state in advance. When the drive recorder main body 20 is connected to the USB I / F 72 of the conversion adapter 70, the drive recorder main body 20 outputs the power and short state only when power is supplied from the ACC switch 12, so that the drive recorder main body 20 is in the drive recorder mode. Operations similar to S7 to S10 shown in FIG. 4 can be performed.

[Modification]
FIG. 7 is a schematic diagram of a modified parking mode device. FIG. 8 is a block diagram of a modified parking mode device. As shown in the figure, the modified parking mode device 50A has a structure in which a primary battery or a secondary battery can be installed and built in the main body without being connected to a vehicle battery.
The delay control unit 56 outputs a signal after elapse of a preset time after the ACC signal is turned off.
The ON / OFF switch 66 is a changeover switch that turns ON / OFF only the parking mode of the parking mode device 50 body manually.

The input control unit 58 controls the voltage conversion unit 60 based on a signal from the delay control unit 56, the ON / OFF switch 66, or the ACC switch 12.
When the ACC switch 12 is ON, the voltage conversion unit 60 converts the voltage into a predetermined voltage and inputs the voltage to the USB I / F 64.
When the ACC switch 12 is OFF, the primary / secondary battery 57 is converted into a predetermined voltage by the voltage converter 60 and input to the USB I / F 64.

The D− / D + control unit 62 serving as the signal line control unit receives the control signal in the short state of the D− / D + signal line when the ACC signal from the input control unit 58 is detected, and the ACC signal from the ACC switch 12. When not detected, the control signal in the open state of the D− / D + signal line is output to the USB I / F 64.
The USB I / F 64 is an interface such as a socket to which a USB cable can be connected, for example.
The parking mode device 50A having such a configuration performs the same control of D− / D + of the USB I / F 64 as described above based on the ON / OFF determination of the detection of the ACC signal from the ACC switch 12 of the vehicle. At this time, the power output from the USB I / F 64 is output via the voltage conversion unit 60 from the primary / secondary battery 57 installed and built in the main body.

  In the above embodiment, the drive record mode is executed based on the short-circuit control signal of the D− / D + signal line output from the parking mode device 50 when the ACC signal from the ACC (accessory) switch 12 is detected. In addition, the configuration in which the parking mode is executed based on the control signal in the open state of the D− / D + signal line when the ACC signal from the ACC switch 12 is not detected has been described. Based on the control signal in the open state of the D− / D + signal line, the drive record mode is executed, and when the ACC signal from the ACC switch 12 is not detected, the control signal in the short state of the D− / D + signal line It is good also as a structure which performs parking mode based on.

  The drive recorder of the present invention has industrial applicability in the vehicle-related manufacturing field and the transportation field.

10, 10A ......... Drive recorder, 12 ......... ACC switch, 14 ......... Vehicle battery, 16 ......... USB cable, 20 ......... Drive recorder body, 22 ......... Accelerometer, 24 ......... Microphone , 26... Communication unit, 28... Camera unit, 30... Shooting control unit, 32... RAM, 34 ... Control unit, 36 ... Memory, 38 ... I / F, 40 ......... Memory card, 42 ......... USB I / F, 44 ......... Power control circuit, 46 ......... D- / D + detector, 48 ......... External battery, 50 ......... Parking mode device, 52 ......... Voltage detection unit, 54 ......... Setting switch, 56 ......... Delay control unit, 58 ......... Input control unit, 60 ...... Voltage conversion unit, 62 ......... D- / D + control unit, 64 ......... USB I / F, 66 ......... ON / OFF Switch, 67 .... Timer.

Claims (3)

An acceleration sensor that detects vehicle vibrations;
A camera unit capable of photographing the outside of the vehicle and / or the inside of the vehicle;
A USB I / F to which a USB cable for connecting to an external terminal can be connected;
A control unit capable of changing the impact sensitivity of the acceleration sensor based on a control signal in a short or open state of the signal line of the USB cable input via the USB I / F;
A drive recorder comprising a drive recorder body having Connect between the drive recorder body and the ACC switch of the vehicle,
When the ACC signal from the ACC switch is detected, either the short or open control signal of the signal line is detected. When the ACC signal from the ACC switch is not detected, either the short or open state of the signal line is detected. The drive recorder according to claim 1, further comprising a parking mode device having a signal line control unit that outputs the other control signal to the USB I / F. The drive recorder body includes a timer that measures a predetermined time after receiving a control signal in a short or open state of the signal line from the parking mode device,
The control unit receives a signal after a predetermined time from the timer, operates only the acceleration sensor, and starts recording of the camera unit after the acceleration sensor detects an impact. 2. The drive recorder described in 2.

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