JP2007011908A - Driving recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle-mounted type driving recorder capable of easily performing the post-analysis of not only the state data of an accident but also the state data of a state such as an incident which may generate an accident and capable of contributing to accident prevention. <P>SOLUTION: The driving recorder is provided with: a data receiving part for receiving state data indicting the behavior, peripheral conditions, operation states, and so on of the vehicle; and a data management part for sorting the received state data into a plurality of previously determined sections on the basis of the contents of the received state data and storing the sorted data in a state data storage part set in a prescribed area of a memory. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  This invention records the behavior and surroundings of a vehicle during a certain period before and after an accident such as the occurrence of an accident or a near-miss accident, and analyzes the cause of the situation. The present invention relates to a driving recorder that can suitably perform the above and the like.

  Recently, a vehicle-mounted driving recorder has been developed that automatically records the images inside and outside the vehicle (automobile) that is being driven so that it can analyze the objective situation in the event of an accident or near-miss event. For example, in taxis, there is a movement to install this kind of driving recorder for accident prevention measures by post-analysis of daily driving, objective evidence of investigation of the cause of accidents, investigation, etc. It has come out.

  Specifically, such a driving recorder stores state data such as external image data, acceleration data, speed data, position data, etc. while being mounted on a vehicle and running in time series in a memory, The post-mortem analysis can be performed by referring to the situation data in the memory.

By the way, conventionally, when recording such situation data (stored in the memory), all the running situation data is stored until the memory is full, the so-called ring buffer memory system is used, and the memory is full. Then, the old situation data is rewritten to new data in order, and when the vehicle acceleration (deceleration) shows a value above a certain level, a near-miss, accident, abnormality, etc. There is known a technique in which only status data for a certain period is recorded from a temporary memory to a non-volatile memory or the like for use in post-mortem analysis (see Patent Document 1).
Japanese Patent Laid-Open No. 5-197858

  However, the above-described conventional system also records situation data in a normal operation that is not an accident or a near-miss, so that subsequent analysis becomes difficult. In other words, as for the former two, since all the situation data is recorded, it is possible to extract situation data at the time of an accident like a near-miss after the fact, regardless of what can be identified from time like an accident. Extremely difficult.

  In the latter case, although some filtering is performed depending on the acceleration, the acceleration sensor reacts due to mere opening / closing of the door or sudden acceleration / deceleration depending on the driver's driving preference, and a lot of unnecessary situation data is acquired. For this reason, it becomes very difficult to select such unnecessary situation data after the fact.

  Therefore, the present invention provides a vehicle-mounted driving recorder that can facilitate post-analysis of not only situation data at the time of an accident but also situation data that has become an accident, such as a near-miss, and can contribute to accident prevention. This is the main intended issue.

  That is, the vehicle-mounted driving recorder according to the present invention includes a data receiving unit that receives situation data that is data indicating vehicle behavior, surrounding conditions, operation conditions, and the like, and the situation data based on the contents of the received situation data. Is classified into one of a plurality of predetermined categories, and a data management unit for storing the data in a status data storage unit set in a predetermined area of the memory is provided.

  Here, the classification may be according to an event that is estimated to have occurred, such as an accident or a near-miss, for example, according to the importance of recording, a combination thereof, or other classification. It does not matter if it is a method. The classification is an operation of storing situation data divided into folders (sections) set in the situation data storage unit, or an operation of assigning an identifier corresponding to the category to each situation data.

  The situation data includes acceleration data indicating acceleration acting on the vehicle, position data indicating the position of the vehicle, speed data indicating the speed of the vehicle, and braking of the vehicle. If brake data indicating whether or not it is operating, door opening and closing data indicating whether or not the door is opened and closed, main power status data indicating whether or not electric power is supplied from the vehicle-side power source, etc. are used in combination Good.

  In other words, it is possible to automatically classify and record the situation data contents according to which of the predetermined criteria the combination of the contents of the situation data corresponds to.

  Specifically, for example, if the vehicle suddenly stops without a brake, the probability of an accident is very high, and the situation data before and after that may be classified into, for example, an accident and the most important, or more than a certain level If the acceleration continues for a certain period of time and then the operation is resumed without opening or closing the door or the like, it is possible that there is a probability of a near-miss, and the situation data before and after that may be recorded in the category of near-miss and important, for example.

  Therefore, with such a configuration, the situation data is automatically classified at the time of recording, so that post-mortem analysis can be performed very easily and accurately. Even if the memory becomes full, if the less important data is automatically erased and rewritten, the memory can be used effectively without erasing important data.

  On the other hand, conventionally, in a taxi or the like, such situation data is stored in a removable nonvolatile memory (CF memory card or the like). For example, after the end of work, the memory is removed from the recorder main body and stored in a center computer at a dispatch center. Although the work of transferring the status data to the memory in the center computer is performed by mounting, the status data of the CF memory card etc. is rewritten at the next boarding due to an artificial mistake of forgetting the work. There is also a case.

  In order to solve such a problem, communication means for wirelessly transmitting the situation data in the situation data storage unit when the vehicle is in a specific place where wireless communication can be performed with respect to a center computer provided in a place different from the vehicle Are preferably further provided.

  In addition, although it overlaps with the data at the time of the record judgment described above, particularly effective situation data for the subsequent analysis of the contents of accidents and near-misses includes acceleration data indicating acceleration acting on the vehicle, position indicating the position of the vehicle Examples thereof include moving image data indicating data and an external image of the vehicle.

  In addition, in order to more accurately determine whether an accident or a near-miss occurs, speed data indicating the speed of the vehicle, brake data indicating whether the vehicle brake is operating, and door opening / closing It is preferable that at least one or all of door opening / closing data indicating whether or not the power is supplied from the vehicle-side power source and main power status data indicating whether or not power is supplied from the vehicle-side power source is further included.

  As described above, according to the present invention, since situation data is automatically classified at the time of recording, post-mortem analysis can be performed very easily and accurately. Even if the memory becomes full, if the less important data is automatically erased and rewritten, the memory can be used effectively without erasing important data.

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

  The driving recorder 1 according to the present embodiment, as shown in FIG. 1 and the like, records the behavior of the automobile vehicle V, the surrounding situation, and the like during a certain period before and after an accident or near-miss, and has a single casing. 2, a detection unit 3, a notification unit 4, an input unit 5, a communication unit 6, a detachable recording unit 7, an information processing unit 8, an auxiliary power source 9 and the like held in the casing 2. And it sticks and uses the adhesive pad 21 which has predetermined | prescribed thermal conductivity in the arbitrary places in the vehicle windshield W.

  Next, each part will be described.

  As shown in FIGS. 2 and 3, the casing 2 has a substantially oval shape almost entirely formed of a metal (magnesium alloy), and a part of the oval shape is cut in a plane in a part thereof. A substantially elliptical flat surface portion 2A formed by this is provided, and the outer peripheral edge portion of the flat surface portion is attached to the vehicle windshield W via a substantially elliptical belt-like adhesive pad 21 having adhesiveness and elasticity.

  As shown in FIG. 4, the detection means 3 senses the behavior of the vehicle, the surrounding situation, the operation situation, etc., and outputs situation data indicating the contents thereof. Here, the CCD camera 31, which is an imaging means, At least three types of acceleration sensor 32 and GPS receiver 33 which is a position sensor are used.

  The CCD camera 31 captures the situation outside the vehicle and outputs situation data (in this case, moving image data, but of course still image data) indicating the image, and is output to the casing flat portion 2A facing the windshield W. The image receiving surface 31a is exposed. The image receiving surface 31a is movable, and can be set in a desired imaging direction in accordance with the attachment position on the windshield W.

  The acceleration sensor 32 is configured using, for example, a piezoresistive effect. The acceleration sensor 32 senses 1-3-dimensional acceleration (for example, front-rear, left-right, top-bottom if 3-dimensional) acting on the vehicle V, and calculates the acceleration. The situation data (acceleration data) to be shown is output. Here, acceleration may be an absolute value and includes deceleration.

  The GPS receiver 33, for example, detects radio waves from a plurality of satellites, senses the position of the vehicle V, and outputs status data (position data) indicating the position. Exposed.

  The situation data includes vehicle speed data transmitted from a vehicle speed sensor (not shown) of the vehicle V, door opening / closing data indicating opening / closing of the door, brake data indicating ON / OFF of the brake, and the like. These are received via the connector CN.

  Further, the driving recorder 1 normally operates by being supplied with power from a vehicle battery (vehicle-side power supply, not shown) via the connector CN, but when the power supply from the vehicle battery is interrupted for some reason, The auxiliary power source 9 automatically switches to the auxiliary power source 9 and supplies the power enough to operate for the predetermined period. Accordingly, whether or not electric power is supplied from the vehicle battery is input to the information processing means 8 described later as main power state data which is one of the situation data.

  As shown in FIG. 2, the notification unit 4 includes an LED 41 that is a light emitter exposed on the opposite side of the casing flat portion 2A, a sound output body (not shown) such as a buzzer or a speaker built in the casing 2, and the like. .

  Here, the input means 5 is a button switch exposed on the opposite side of the casing flat surface portion 2A.

  Here, the communication means 6 is hardware for a wireless LAN that is built in the casing 2 and transmits / receives various data by radio waves to / from a center computer (not shown) provided in the distribution center.

  Here, the detachable recording means 7 is a CF memory card that is removably attached to a slot 2 b that opens to the side of the casing 2.

  As shown in FIG. 4, the information processing means 8 has a CPU 81, an internal memory 82 (for example, a non-volatile memory), an I / O buffer circuit (which may include an AD converter) 83, and the like. The so-called computer circuit is built in the casing 2. Then, as shown in FIG. 5, the CPU 81 operates according to a program stored in a predetermined area of the internal memory 82 to perform control and information processing of each means, and a data receiving unit 801, a temporary data storing unit 802, It functions as a status data storage unit 803, a data management unit 804, a determination criterion parameter storage unit 805, and the like.

  The data receiving unit 801 receives the situation data, which is data related to the behavior of the vehicle V, the surrounding situation, and the like one after another at a constant sampling time, and the received situation data is stored in the internal memory 82. Are successively written in the temporary data storage unit 802 set in the predetermined area. When the temporary data storage unit 802 is full, old data is sequentially deleted and new status data is written there.

  The data management unit 804 determines whether or not the content of the situation data stored in the temporary data storage unit 802 satisfies a predetermined condition, and only when the predetermined condition is satisfied, the vehicle situation data for a certain period before and after the predetermined condition. Are transferred from the temporary data storage unit 802 to the internal memory 82 or / and the status data storage unit 803 provided in a predetermined area of the removable recording means 7.

  Here, in determining whether or not the predetermined condition is satisfied, a determination criterion parameter provided corresponding to each situation data is used. This criterion parameter is stored in advance in a criterion parameter storage unit 805 provided in a predetermined area of the internal memory.

  Then, the value (contents) of each situation data is binarized, for example, according to the determination criterion parameter. Specifically, whether or not the acceleration (deceleration) exceeds a predetermined judgment reference value, whether or not the acceleration has continued for a certain period of time, whether or not the door is open, and power is supplied from the battery. Whether the vehicle speed is equal to or higher than a predetermined upper limit speed, whether the vehicle speed is equal to or lower than a predetermined lower limit speed, the presence or absence of a brake, etc. are all binarized.

  After that, whether or not a predetermined condition is satisfied is judged from the result of performing logical operations such as AND / OR on them. Depending on the type and contents of the situation data, the contents of other situation data may be combined. Some are judged in combination, and some judge whether a predetermined condition is satisfied only by the contents of a single situation data. For example, in this embodiment, if no power is supplied from the battery, it is immediately determined that the predetermined condition is satisfied with the single event, and even if the door is opened, the single event is similarly performed. Immediately determine that the prescribed condition is satisfied. On the other hand, in terms of acceleration, it is determined that a predetermined condition is satisfied only after two events that exceed a predetermined criterion value and continue for a certain period or longer are satisfied.

  In this embodiment, when it is determined that the predetermined condition is satisfied (when it is determined that a near-miss or accident occurred), the driver is notified of the fact by light or sound from the notification means 4 and the determination is correct. For example, whether or not the button switch 5 is turned on / off is confirmed by input data from the driver (this is also one of the situation data). Even when there is no notification by the notification means 4, the driver can voluntarily press the button switch 5 and input a near-miss or accident.

  Only when the driver determines that a near-miss or accident has occurred, presses the button switch 5 and receives input data indicating that, the temporary data storage unit 802 transfers the status data for a certain period to the status data storage unit 803. To be transported. If the difference between the temporary data storage unit 802 and the situation data storage unit 803 is given, the former simply stores them temporarily regardless of the contents of the situation data, whereas the latter The situation data is basically not rewritten but stored in a registered manner. When rewriting, the situation data is transferred to another recording means (for example, the removable recording means 7). Become.

  In the present embodiment, the data management unit 804 learns and updates the content of the predetermined condition and the situation data stored in the situation data storage unit 803 according to the type and importance of the situation. And an automatic transmission function for automatically transmitting status data to a center computer (not shown) via the communication means 6.

  The learning function is a function that grasps the driving tendency of the driver and updates the predetermined condition by feeding back the correct / incorrect input from the driver when it is determined that the predetermined condition is satisfied. Specifically, the value of the criterion parameter and the logical operation expression such as AND / OR are updated. For example, if the driver is prone to sudden braking, the value of the criterion parameter related to acceleration is gradually increased from the default value by this learning function, and a situation in which it is normally judged as a near-miss is considered as normal driving. Thus, useless data accumulation is eliminated.

  The data classification function weights situation data over a certain period of time to be recorded from the contents at the time of recording, and is provided in the situation data storage unit 803 according to the importance of recording such as most important, important, or ordinary. This is a function for organizing and storing folders (category). As an example, if the vehicle V suddenly stops without a brake, the probability of an accident is very high, and status data for a certain period before and after that is recorded in, for example, the most important folder. Further, when the driver voluntarily inputs with the button switch 5, it is recorded in the folder that is most important. In addition, if, for example, a certain acceleration or more continues for a certain period and then the operation is resumed without opening or closing the door or the like, it is assumed that there is a possibility of a near-miss, and the situation data before and after that is recorded in, for example, an important folder.

  When the capacity of the situation data storage unit 803 becomes full, the less important data than the new situation data is automatically deleted, and the new situation data is recorded instead. It is composed.

  The automatic transmission function is particularly effectively used in, for example, a taxi or a bus. That is, when the vehicle V is in a specific place such as a dispatch center, a wireless line is automatically or manually opened to the center computer in the dispatch center, and the situation data in the situation data storage unit 803 is transferred to the communication means 6. This is a function of transmitting the vehicle V in association with the identifier of the driver.

  According to the driving recorder 1 according to the present embodiment configured as described above, the situation data is automatically classified according to the importance by the data classification function and stored in the situation data storage unit 803. In this state, the post-mortem analysis can be performed very smoothly by transmitting the situation data to the center computer for analysis. Furthermore, even when the capacity of the status data storage unit 803 becomes full, the status data with high importance remains, so that the memory can be used effectively.

  In addition, when a situation that seems to be an accident or a near-miss is judged from a plurality of contents indicated by each situation data, a series of situation data for a certain period before and after that is officially stored (both recorded) Compared to those that store all the situation data and those that judge only from the single contents of the situation data, it is possible to omit unnecessary situation data accurately, Efficient use becomes possible. In addition, since unnecessary data is omitted, an effect of facilitating post-mortem analysis can be obtained in this respect.

  Furthermore, in order to learn the driving tendency at the time of an accident or near-miss according to the characteristics of the driver individually and update the predetermined condition data as a judgment criterion accordingly, this predetermined condition data is uniformly set Compared with, it is possible to obtain useless situation data and to obtain situation data at the time of an accident or near-miss without missing.

  In addition, since the automatic transmission function automatically transmits the situation data in the situation data storage unit 803 to another center computer and stores it when the vehicle V is in a specific place, the removable recording means 7 It is possible to prevent the situation data from being lost due to forgetting to pull out, and in some cases, the removable recording means 7 itself can be made unnecessary.

  The present invention is not limited to the above embodiment. For example, the situation data acquired by the driving recorder may include brake information such as the time, length, and number of times the brake is depressed, blinker operation information, and the like.

  The situation data storage unit may simply store the situation data according to the time series without classifying the situation data according to the importance.

  In addition, it goes without saying that the present invention can be variously modified without departing from the spirit of the present invention.

The typical front view showing the case where the driving recorder concerning one embodiment of the present invention is attached to the car. The perspective view at the time of seeing from the vehicle inside of the driving recorder in the embodiment. The perspective view at the time of seeing from the vehicle outer side of the driving recorder in the embodiment. The typical block diagram of the driving recorder in the embodiment. The functional block diagram of the information processing means in the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Driving recorder 801 ... Data receiving part 802 ... Temporary data storage part 803 ... Status data storage part 804 ... Data management part

Claims (5)

A data receiving unit for receiving situation data, which is data indicating the behavior of the vehicle, the surrounding situation, the operation situation, and the like;
A data management unit for classifying the situation data into one of a plurality of predetermined categories based on the contents of the received situation data and storing the situation data in a situation data storage unit set in a predetermined area of the memory; Vehicle-mounted driving recorder.   The vehicle-mounted driving recorder according to claim 1, wherein the classification is set according to recording importance.   2. A communication means for wirelessly transmitting status data in the status data storage unit when the vehicle is in a specific location where wireless communication is possible with respect to a center computer provided at a location different from the vehicle. Or the vehicle-mounted driving recorder of 2 description.   The vehicle-mounted driving recorder according to claim 1, 2 or 3, wherein the situation data includes at least acceleration data indicating acceleration acting on the vehicle, position data indicating the position of the vehicle, and moving image data indicating an external image of the vehicle. Situation data includes speed data indicating the speed of the vehicle, brake data indicating whether the vehicle brake is operating, door opening / closing data indicating whether the door is open or closed, and power supplied from the vehicle-side power source. The vehicle-mounted driving recorder according to claim 4, further comprising at least one or all of main power status data indicating whether or not there is.

Images