JP2013130935A - In-vehicle drive recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an in-vehicle drive recorder for starting the initialization of an acceleration sensor on mounting without installing any mechanism component such as a switch, and for more improving the waterproofness and strength of the drive recorder than a conventional manner.SOLUTION: An in-vehicle drive recorder 100 including an acceleration sensor 23 includes: an acceleration signal/data conversion part 42 for converting a signal to be output from the acceleration sensor 23 into acceleration data; and an initialization part 48 for, when a predetermined trigger signal waveform is output from the acceleration sensor 23, starting initialization in the acceleration signal/data conversion part 42.

Description

  The present invention relates to a vehicle-mounted drive capable of recording data relating to the behavior of a vehicle in a certain period of time and video data such as the surrounding situation in the event that an accident such as an accident or a near-miss occurs. It relates to the recorder.

  Vehicle-mounted type that automatically records video and behavior data around vehicles (automobiles and motorcycles) during approximation and driving, and enables post-analysis of the objective situation when an accident or near-miss occurs Drive recorders have been developed.

  For example, as shown in Patent Document 1 and FIG. 8A, the present applicant has already applied for a vehicle-mounted drive recorder 100 </ b> A of the type attached to the inside of the windshield of the automobile V.

  By the way, the above-described drive recorder 100A is provided with an acceleration sensor for measuring the behavior of the vehicle, and is configured to record information on acceleration / deceleration of the mounted vehicle.

  In order to be able to acquire accurate acceleration data before and after the occurrence of an accident or near-miss based on the output signal from such an acceleration sensor, the zero point of the signal output from the acceleration sensor when the drive recorder is installed It is necessary to make initial settings such as correction and measurement axis correction. Conventionally, when the user presses the initial setting start switch SW shown in FIG. 8 (b) provided in the drive recorder when attached to the vehicle, various corrections of the acceleration sensor are started, and accurate data recording is performed. It is configured to do so.

  However, the initial setting of the acceleration sensor is basically made only at the time of initial mounting, and it is very wasteful in terms of cost and space to provide a switch for such an operation that is used only once. It has become. In the case of a drive recorder attached to a motorcycle, it is exposed to wind and rain. If such a switch is provided, water may enter the inside of the switch and cause a failure.

JP 2007-011906 A

  The present invention has been made in view of the above-described problems. The initial setting of the acceleration sensor at the time of installation can be started without providing a mechanical component such as a switch, and the waterproofness and strength of the drive recorder can be started. An object of the present invention is to provide a vehicle-mounted drive recorder that can increase the drive speed of the vehicle.

  That is, the vehicle-mounted drive recorder of the present invention is a vehicle-mounted drive recorder provided with an acceleration sensor, and includes an acceleration signal / data conversion unit that converts a signal output from the acceleration sensor into acceleration data, and the acceleration. And an initial setting unit that starts an initial setting in the acceleration signal / data conversion unit when a predetermined trigger signal waveform is output from the sensor.

  If it is such, for example, by giving a predetermined vibration to the vehicle-mounted drive recorder, the predetermined trigger signal is output from the acceleration sensor, and the acceleration signal is sent to the initial setting unit.・ The initial setting of the data converter can be started.

  Accordingly, since a switch can be omitted from the vehicle-mounted drive recorder as a mechanism part for causing the initial setting unit to start initial setting, for example, a gap is provided by a switch or the like in a housing that houses various parts of the drive recorder. Since it does not occur, it is easy to improve waterproofness and strength. In other words, even when it is attached to a motorcycle or the like and exposed to wind and rain, it becomes easy to prevent the drive recorder from being broken, and the reliability can be improved.

  Further, since the switch for starting the initial setting can be omitted, the manufacturing cost can be reduced accordingly.

  In order to allow the user to easily start the initial setting for the initial setting unit, the predetermined trigger signal waveform is a signal waveform that is output when a person strikes the vehicle-mounted drive recorder. It may be set based on. If this is the case, for example, the initial setting is not started by a minute vibration or the like at the time of carrying, and it becomes easy to operate only when necessary at the time of attachment or the like.

  As a detection configuration that makes it possible to easily detect the predetermined trigger signal waveform and to prevent malfunction, the initial setting unit is configured to determine the predetermined trigger signal waveform based on the amplitude or vibration time of the signal waveform output from the acceleration sensor. Examples include those configured to detect a trigger signal waveform.

  In order to maintain data continuity while the initial setting unit does not operate while the driving situation is being recorded by the vehicle-mounted drive recorder, and the initial setting is not changed midway. A media slot into which a removable recording medium is inserted, wherein the initial trigger when no removable recording medium is inserted into the media slot and the predetermined trigger signal waveform is output from the acceleration sensor. Any setting unit may be used as long as it is configured to start the initial setting in the acceleration signal / data conversion unit.

  As described above, according to the vehicle-mounted drive recorder of the present invention, when the predetermined trigger signal waveform output from the acceleration sensor is detected, the initial setting unit starts the initial setting of the acceleration signal / data conversion unit. Even if no mechanical parts such as a switch are provided, the initial setting of the acceleration signal / data conversion unit can be started at an arbitrary timing by hitting the vehicle-mounted drive recorder or the like. Can do.

The schematic diagram which shows the attachment state of the vehicle-mounted drive recorder which concerns on one Embodiment of this invention. The typical front perspective view of the vehicle-mounted drive recorder in the embodiment. The typical back perspective view of the vehicle-mounted drive recorder in the embodiment. The typical block diagram of the vehicle-mounted drive recorder in the embodiment. The functional block diagram of the information processing mechanism in the embodiment. The schematic diagram which shows an example of the predetermined trigger signal waveform in the embodiment. The schematic diagram shown about correction | amendment of the measurement axis | shaft of the initial setting part in the embodiment. The schematic diagram which shows an example of the conventional vehicle-mounted drive recorder.

  An embodiment of the present invention will be described with reference to the drawings.

  The vehicle-mounted drive recorder 100 of the present embodiment is attached to the handle portion of the motorcycle B as shown in FIG. 1, and in the case where an accident can occur even before an accident such as an accident or a near-miss occurs. This is for recording video data such as data on the behavior of the vehicle and surrounding conditions in a certain period of time.

  As shown in FIGS. 2 and 3, the vehicle-mounted drive recorder 100 has a substantially cylindrical casing 11 with a camera 22 exposed on one end face thereof, and an outline on the opposite end face. A media slot S for inserting a thin disc-shaped removable recording medium 31 is provided. A cap 12 is formed on the end surface where the media slot S is formed, so that the media slot S is not exposed to the outside during traveling or the like. An attachment portion 13 for the handle is formed on the lower side of the casing 11 and an external notification unit 32 is provided on the upper side. Further, as apparent from FIGS. 2 and 3, no mechanical parts such as a switch for creating a gap in the casing 11 are provided, and water or the like cannot enter the casing 11 when the cap 12 is attached. It is constituted as follows.

  In the casing 11, at least a GPS receiver 21, the camera 22, an acceleration sensor 23, an external notification unit 32, the media slot S, a communication mechanism 33, an information processing mechanism 4, and an auxiliary power source 5 are held.

  The GPS receiver 21 acquires, for example, the position of the motorcycle B on the earth from radio waves from a plurality of satellites, and outputs the position data.

  The camera 22 captures the situation outside the vehicle and outputs the moving image data and still image data. The imaging direction can be adjusted as appropriate depending on the mounting angle of the casing 11 with respect to the handle. This camera 22 uses, for example, a CMOS or the like.

  The acceleration sensor 23 is configured using, for example, a piezoresistive effect, and senses 1-3-dimensional (X-axis, Y-axis, Z-axis direction) acceleration acting on the motorcycle B, and calculates the acceleration. A corresponding electrical signal is output.

  Further, speed data output from a speed sensor (not shown) that measures the speed based on the number of rotations of the wheel of the motorcycle B, brake data indicating ON / OFF of the brake, and the like are received via the connector C.

  Further, the drive recorder 100 operates with power supplied from the battery of the motorcycle B (vehicle-side power supply, not shown) via the connector C, but the power supply from the battery of the motorcycle B cannot be received for some reason. Are automatically switched to the auxiliary power source 5. The capacity of the auxiliary power source 5 can supply at least power sufficient to operate for a certain period before and after an accident or the like.

  The external notification unit 32 is an LED or the like for illuminating that the initial setting by the initial setting unit 48 described later has been completed. The external notification unit 32 may notify the end of the initial setting by a sound other than an indicator such as an LED.

  The media slot S can be used to insert a detachable recording medium 31 and can handle a medium having a storage capacity that can store at least a variety of data for a certain period before and after an accident. .

  The communication mechanism 33 is hardware for wireless LAN for transmitting and receiving recorded data and the like during traveling to / from a parent device such as a computer (not shown) provided separately.

  Structurally, the information processing mechanism 4 is a so-called computer circuit having a CPU, an internal memory, an I / O buffer circuit (which may include an A / D converter or the like) as shown in FIG. It is built in the casing 11. Then, as shown in FIG. 5, the CPU executes a program stored in a predetermined area of the memory to perform control and information processing of each unit, and at least the data receiving unit 41, acceleration signal / data conversion Functions of the unit 42, the temporary data storage unit 43, the situation data storage unit 46, the determination criterion parameter storage unit 45, the data management unit 44, the mode switching unit 47, and the initial setting unit 48 are realized.

  Each part will be described.

  The data receiving unit 41 sequentially transmits, for example, speed data, brake data, battery power data, position data, moving image data, etc. in time series with a constant sampling time, among data relating to the behavior of the motorbike B and surrounding conditions. Each received data is sequentially written into the temporary data storage unit 43 set in a predetermined area in the internal memory.

  The acceleration signal / data converter 42 converts an electrical signal output from the acceleration sensor 23 into acceleration data. More specifically, based on the electrical signal acquired from the acceleration sensor 23 in each axial direction of the acceleration sensor 23, the coordinate axes (for example, the front and rear axes, the left and right axes, and the up and down axes) set for the motorcycle B with respect to each direction It is converted into acceleration and converted into data. The acceleration signal / data converter 42 converts the data obtained by converting the electrical signal output from the acceleration sensor 23 into a direction or value that is meaningful for recording the driving situation of the motorcycle B. Are sequentially written at every sampling time. Hereinafter, each data received by the data receiving unit 41 and acceleration data output from the acceleration signal / data converting unit 42 are collectively referred to as status data.

  When the capacity of the temporary data storage unit 43 becomes full, old situation data is sequentially deleted, and new situation data is written there.

  The data management unit 44 determines whether or not the content of the situation data stored in the temporary data storage unit 43 satisfies a predetermined condition. Only when the predetermined condition is satisfied, the data management unit 44 stores the situation data for a certain period before and after the predetermined condition. The data is transferred from the temporary data storage unit 43 to the status data storage unit 46 provided in a predetermined area of the internal memory or the removable recording medium 31.

  Here, in determining whether or not the predetermined condition is satisfied, a determination criterion parameter provided corresponding to each situation data is used. This determination criterion parameter is stored in advance in a determination criterion parameter storage unit 45 provided in a predetermined area of the internal memory. For example, the judgment criterion parameter can transfer situation data when there is a possibility that an accident or a near-miss has occurred based on whether the acceleration exceeds a predetermined value or the like.

  The mode switching unit 47 switches the operation mode of the drive recorder 100 depending on whether or not the removable recording medium 31 is inserted in the media slot S. More specifically, when the removable recording medium 31 is inserted into the media slot S, the data management unit 44 uses the status data management unit 44 or the removable recording medium 31 to record the status data. And the drive recorder 100 is operated in the recording mode. That is, the vehicle drive data can be recorded as a normal drive recorder 100. On the other hand, when the detachable recording medium 31 is not inserted in the media slot S, the mode switching unit 47 prohibits transfer of status data by the data management unit 44 and also by an initial setting unit 48 described later. The initial setting is permitted and the drive recorder 100 is configured to operate in the setting mode.

  The initial setting unit 48 is configured such that the removable recording medium 31 is not inserted into the media slot S, the mode switching unit 47 selects the setting mode, and the predetermined trigger signal waveform from the acceleration sensor 23 is selected. Is output, the initial setting unit 48 starts the initial setting in the acceleration signal / data conversion unit 42.

  Here, the initial setting unit 48 is configured to perform zero point correction of the acceleration signal / data conversion unit 42 and correction in the measurement axis direction as an initial setting when the drive recorder 100 is attached to the motorcycle B. is there. Further, the predetermined trigger signal waveform is set based on a waveform signal output from the acceleration sensor 23 when a person strikes the casing 11, and the initial setting unit 48 is output, for example. By comparing the amplitude and vibration time of the signal waveform with a predetermined value, it is configured to detect whether or not the casing 11 has been hit by a person.

  Hereinafter, the initial setting unit 48 will be described in detail in connection with the operation at the time of initial setting.

  When the casing 11 is tapped by the user after the drive recorder 100 is attached to the handle of the motorcycle B, a signal waveform whose amplitude gradually decreases as the vibration time elapses as shown in the graph of FIG. 23. When the amplitude or vibration time of the signal waveform is equal to or greater than a predetermined value, the initial setting unit 48 performs zero point correction after the amplitude of the signal waveform output from the acceleration sensor 23 falls within the predetermined value. Start correction of measurement axis.

  That is, the initial value of the electrical signal output from the acceleration sensor 23 after the vibration after the user strikes is settled is set as a zero point where acceleration is not detected. Further, as shown in FIG. 7, the conversion coefficient is calculated so that the measurement axis of the acceleration sensor 23 substantially coincides with the longitudinal axis, the lateral axis, and the vertical axis of the motorcycle B. For example, a rotation matrix or the like is calculated so that the measurement values between the coordinate axes can be corrected.

  When the initial setting by the initial setting unit 48 ends, the external notification unit 32 is illuminated to notify the user that the initial setting has ended.

  After the initial setting is completed, the acceleration signal / data conversion unit 42 generates acceleration data from the electric signal based on the zero point set by the initial setting unit 48 and the correction coefficient of the measurement axis, and outputs the acceleration data. It is.

  Thus, according to the vehicle-mounted drive recorder 100 of the present embodiment, when the predetermined trigger signal waveform output from the acceleration sensor 23 is detected, that is, it is detected that the casing 11 has been hit by the user. In this case, the initial setting unit 48 is configured to start the initial setting of the acceleration signal / data conversion unit 42. Therefore, the initial setting can be performed at an arbitrary timing even if a mechanical part such as a switch is not provided. Can be started.

  Therefore, since there is no need to provide a switch for starting the initial setting, there is no gap in the casing 11, the waterproof property can be easily improved, and the strength can be improved. Therefore, it is easy to prevent a failure from occurring due to water entering the drive recorder 100 even when it is attached to the motorcycle B and exposed to wind and rain, and situation data can be accurately recorded over a long period of time.

  Further, since there is no need to provide the switch, the manufacturing cost can be reduced accordingly.

  Further, since the initial setting unit 48 is configured not to start the initial setting when the removable recording medium 31 is not inserted into the media slot S, the removable recording medium 31 is inserted, No initial setting is made while recording the normal driving situation. That is, it is possible to prevent a situation in which the continuity of the situation data is lost by changing the setting of the zero point or the measurement axis during the recording of the operation situation.

  Other embodiments will be described.

  In the above embodiment, the predetermined signal waveform is set based on the signal waveform of the acceleration sensor generated when a person strikes the drive recorder, but may be set based on other signal waveforms. . In short, any signal waveform that can be distinguished from the signal waveform output from the acceleration sensor at the normal time may be used.

  In the embodiment, a motorcycle is shown as an example of a vehicle, but the vehicle-mounted drive recorder of the present invention may be provided in an automobile. The correction performed by the initial setting unit may be either zero point correction or measurement axis setting, or other corrections. For example, linearity output from the acceleration sensor may be corrected.

  In the embodiment, the drive recorder accommodates the camera in the casing. However, the camera and the information processing mechanism in the casing are separated by separating only the camera and accommodating other components in the casing. You may comprise so that information can be exchanged by wire or radio | wireless. More specifically, the camera is fixed to a handle portion of a motorcycle so that the surrounding situation can be imaged, and at least a GPS receiver, an acceleration sensor, an external notification unit, a communication mechanism, an information processing mechanism, and an auxiliary power source are provided. What is necessary is just to accommodate in a casing and to install the said casing in the place which is not exposed to a wind and rain in a motorcycle, or is not easily exposed. For example, what is necessary is just to accommodate the said casing in the articles | goods accommodating part etc. which are provided in the seat lower part of a motorcycle, a back of a seat, etc. If it does in this way, the waterproofness to the member accommodated in the casing can further be improved.

  In the embodiment, the initial setting unit is configured to start the initial setting every time a trigger signal waveform is output from the acceleration sensor in a state where no removable recording medium is inserted in the media slot. However, once the initial setting is completed, the initial setting is not started even if a trigger signal waveform is output from the acceleration sensor when no removable recording medium is inserted in the media slot, and the initial setting is not updated again. It doesn't matter. In this way, it is possible to continue to use the initial setting set at the time of attachment, and then the initial setting is restored again when the casing is vibrated unintentionally when the removable recording medium is not inserted. It is possible to prevent a situation such as being started.

  In addition, in the configuration as described above, the motorcycle is accidentally overturned by the initial setting when the drive recorder is installed, and the initial setting is started due to the influence, and zero point correction and measurement axis setting are performed incorrectly. In order to enable the initial setting to be performed again in the case where the drive recorder is disconnected, the mode switching unit is configured such that when the power source of the drive recorder is switched from OFF to ON, no removable recording medium is inserted in the media slot. The drive recorder may be configured to shift to the initial setting mode. If this is the case, normally, if a detachable recording medium is always inserted in the media slot, it is possible to prevent the initial setting from being started unintentionally and to attach / detach when reinitialization is necessary. The initial setting can be redone by simply turning the power of the drive recorder off and then on again after removing the recording medium.

  In addition, various modifications and combinations of embodiments may be performed without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 100 ... Vehicle-mounted drive recorder 23 ... Acceleration sensor 42 ... Acceleration signal / data conversion part 48 ... Initial setting part 31 ... Detachable recording medium

Claims (5)

A vehicle-mounted drive recorder equipped with an acceleration sensor,
An acceleration signal / data converter for converting a signal output from the acceleration sensor into acceleration data;
An on-vehicle type drive recorder comprising: an initial setting unit that starts an initial setting in the acceleration signal / data conversion unit when a predetermined trigger signal waveform is output from the acceleration sensor.   The vehicle-mounted drive recorder according to claim 1, wherein the predetermined trigger signal waveform is set based on a signal waveform output when a person strikes the vehicle-mounted drive recorder.   The vehicle-mounted drive recorder according to claim 1 or 2, wherein the initial setting unit is configured to detect the predetermined trigger signal waveform based on an amplitude or vibration time of a signal waveform output from the acceleration sensor.   The vehicle-mounted drive recorder according to any one of claims 1 to 3, wherein the initial setting unit is configured to perform zero point correction or correction in a measurement axis direction of the acceleration signal / data conversion unit. A media slot into which the removable recording medium is inserted;
When the removable recording medium is not inserted in the media slot and the predetermined trigger signal waveform is output from the acceleration sensor, the initial setting unit starts the initial setting in the acceleration signal / data conversion unit. The vehicle-mounted drive recorder according to claim 1, wherein the vehicle-mounted drive recorder is configured as described above.