JPH1153595A - Vehicle accident recording device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a vehicle accident recording device capable of recording data enabling analysis of an accident state at the time of occurrence and elucidation of an original cause of the accident. SOLUTION: A data processing mechanism or the like connected to an operation data recording means 101 (a recording unit of a so-called operation recorder 100 or the like) is shorter than the time from the occurrence of an accident to the time it is destroyed, and before and after the occurrence of the accident. By transmitting and writing data for about a second to the operation data recording means 101, an outline of the operation state of the vehicle over a long period of about one day to two weeks recorded on the operation data recording means 101 is obtained. In addition to the data, it was possible to record short but detailed data before and after the accident, and to compare them both to enable effective analysis of the cause after the accident.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle accident recording apparatus which is mounted on a business vehicle such as a taxi vehicle or a transportation vehicle and records an accident when the vehicle encounters an accident.

[0002]

2. Description of the Related Art A vehicle accident recording device is mounted on a commercial vehicle such as a taxi vehicle or a luggage truck, and when an accident such as a collision accident occurs in a vehicle, it is 10 seconds to 1 second before and after the accident. This device is mounted on a vehicle for the purpose of recording data such as the running state of the vehicle in a non-volatile memory over a period of about a minute and using the data as data for accident analysis.

[0003] Such a vehicle accident recording apparatus has a powerful instantaneous G even in a collision accident having the highest probability of occurrence.
(Acceleration) It is required to function accurately without being destroyed and to reliably record accidents. Therefore, it is desired that the vehicle accident recording device be as small and light as possible in order to prevent the vehicle accident recording device from being destroyed by the impact force or the like caused by the strong G even if the strong G is applied. It is also desirable that the internal structure be as simple and robust as possible within a range where the function can be sufficiently achieved.

[0004] In view of the above demands, a vehicle accident recording apparatus generally has a function of 10 seconds to 2 hours before and after the occurrence of an accident.
Detailed data such as running speed and acceleration only within a very limited time range of about minutes is recorded in a recording means such as an EEPROM. The data before and after that is not recorded.

[0005] When analyzing the cause of an accident or the like after an accident, quite detailed data such as a running state is required for at least about 10 seconds before and after the accident. The data is small and
It is practically impossible to record the entirety (for example, for one day) inside a vehicle accident recording apparatus, which is required to be reduced in weight to the utmost, because it causes a huge increase in recording capacity. is there.

In particular, the acceleration of each space (three-dimensional) such as vertical (z-axis), left-right (y-axis), and front-back (x-axis) as an object of a vehicle before and after the occurrence of an accident is used as data for accident analysis. In order to record data that is sufficiently detailed to be used over a long period of time, for example, two days (i.e., 17280 times compared to the above 10 seconds), the data must be collected and processed. This is because the structure and the recording capacity for realizing the writing process become enormous, which is contrary to the above demands for reduction in size and weight and simplification. In order to avoid this, there is a method in which data for a long period of time is collected as compact data by compressing only the data necessary for use, etc., and then recorded. Is inevitable to be enormous. Therefore, in the conventional vehicle accident recording device,
Only detailed data such as the running state for about 10 seconds before and after the occurrence of the accident has been recorded in a nonvolatile memory such as an EEPROM.

[0007]

According to the conventional vehicle accident recording apparatus as described above, the state at the time of the occurrence of the accident itself can be certainly analyzed from data for a total of about 20 seconds before and after the accident. is there.

However, the original post-cause investigation is
It is necessary to analyze the cause of such an accident, that is, the state of the driver and the vehicle, but in the above-described conventional vehicle accident recording device, detailed information such as the running state before and after the accident occurs is described. Since the data is recorded only for about 10 seconds before and after the accident, it is practically impossible to analyze the data only from the data for about 10 seconds before and after the accident.

Generally, the cause of such an accident is often caused not by the condition at the time of the occurrence of the accident but by the condition of the driver or the vehicle until several hours to about two days before. However, in the conventional vehicle accident recording device, it is impossible to keep such a long-time record for the above-described reason, and it is substantially impossible to clarify the original cause of the accident. There was a problem.

The present invention has been made to solve such a problem. SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle accident recording apparatus capable of recording data that enables analysis of the state of an accident at the time of occurrence and also enables elucidation of the original cause of the accident.

[0011]

First, a vehicle accident recording apparatus 200 of the present invention is applied to a vehicle having a vehicle operation data recording means 101 for recording time-series vehicle operation information including at least a driving state as data. A vehicle accident recording device 200 to be installed, comprising: detecting means 201 for detecting the occurrence of an accident when the vehicle has an accident; and collecting data on a running state of the vehicle for a certain period of time before and after the accident. In a vehicle accident recording apparatus 200 having an accident data collecting means 202 and an accident data recording means 203 for recording the data, when the occurrence of the accident is detected, the vehicle travels for a certain time before and after the accident. A writing means 205 for writing status data to the operation data recording means 101 via a transmission means 204 is provided.

That is, since the data recorded by the conventional vehicle accident recording device 200 is only data within a short time of about 10 seconds before and after the occurrence of the accident, the cause (distant cause) analysis of the accident using the long-time data can be performed. It was impossible. But,
According to the present invention, the data for about 10 seconds before and after the occurrence of the accident is transferred from the occurrence of the accident until the data processing mechanism or the like connected to the operation data recording means 101 (a recording unit such as the so-called operation recorder 100) is destroyed. By transmitting and writing the data to the operation data recording means 101 within a time shorter than the time, the outline of the operation state of the vehicle over a long period of about one day to two weeks recorded in the operation data recording means 101 In addition to the above data, short but detailed data before and after the accident can be recorded, and can be effectively used for cause analysis after the accident.

That is, an operating data recording means (recording unit of the operation recorder 100) 101 for recording an outline of the operating state of the vehicle over a long period of time, generally about one day to two weeks, is mounted on the commercial vehicle. In general, the operation recorder records data on the operation state of the vehicle at a coarser data density or a sampling density, though the data is longer than the vehicle accident recording device 200 described above.

Therefore, the accident analysis can be performed by using the data of the operation state of the vehicle for a long time and the detailed data before and after the accident written and transmitted as described above. It can be used to clarify the causes of accidents. Second, the vehicle operation data recording means 10
Reference numeral 1 is a recording unit including a nonvolatile recording area 300 for holding data once written.

That is, the vehicle operation data recording means 10
By using 1 as a non-volatile memory, even after an accident occurs and a writing mechanism or the like connected to the vehicle operation data recording means 101 is destroyed, long-term operation data recorded up to that time is recorded. And data before and after the accident written at the time of occurrence of the accident can be held without volatilizing.

Thirdly, in the vehicle accident recording device according to the first or second aspect, at least one of the vehicle operation data recording means 101 and the accident data recording means 203 is detachable from the vehicle. It is characterized by being implemented.

That is, since the vehicle operation data recording means 101 and the accident data recording means 203 can be detached from the vehicle, the vehicle accident recording device 200 and the vehicle operation recorder 100 which mechanically store them can be used when an accident occurs. Even if the data is damaged and the data cannot be read out, only the vehicle operation data recording means 101 and the accident data recording means 203 on which the most necessary data are recorded are taken out and recorded inside by an external reading device or the like. The accident data can be analyzed by reading the data obtained.

The vehicle operation data recording means 101 and the accident data recording means 203 are formed, for example, in the form of an IC card detachable from the vehicle operation recorder 100 and have a recording device (storage circuit). As the element, a recording unit using a nonvolatile memory such as an EEPROM is preferable.

Fourthly, a vehicle accident recording device 200 installed in a vehicle having a vehicle operation data recording means 101 for recording time-series vehicle operation information including at least a traveling state as data, Detecting means 201 for detecting the occurrence of an accident when an accident occurs, an accident data collecting means 202 for collecting data on the running state of the vehicle for a certain period of time before and after the accident, and accident data for recording the data In the vehicle accident recording device 200 having the recording means 203, when the occurrence of the accident is detected, at least a certain amount of data of the vehicle operation information recorded in the vehicle operation data recording means 101 before and after the accident is detected. The data including the time and over a longer time is read out via the transmission means 204 and the accident data recording means 20 is read out. A vehicle accident recording device 200 and recording the.

That is, the vehicle accident recording device 200 stores not only data of several tens of seconds before and after the accident, but also vehicle operation data for a longer time (for example, 12 hours) including the time. Is read out from the vehicle operation data recording means 101 of the vehicle operation recorder 100 that records it, and is recorded in the accident data recording means 203 provided inside the vehicle accident recording device, so that the vehicle for a long time is recorded. The accident analysis can be performed by using the operation state data and the detailed data before and after the accident together, and the original cause of the accident can be clarified.

Fifthly, in the vehicle accident recording apparatus 200 according to the fourth aspect, the reading means for reading the data of the vehicle operation information first from data which is closer in time to the accident. 206 is provided. That is, in the technology described in the fourth aspect, when an accident occurs, data of vehicle operation information is transmitted from the vehicle operation data recording unit 101 to the accident data recording unit 203. At this time, before the data transmission is completely terminated, depending on the occurrence state of the accident (that is, the impact is extremely high and the acceleration G is strong, etc.), or the data amount of the vehicle operation information or the data processing speed such as the reading thereof, In some cases, the transmission path and the data processing mechanism may be damaged.

Therefore, in consideration of such a case in more detail, in the technology described in the fifth aspect, the vehicle operation data is read out with priority given to data closer in time to the accident first. By transmitting the data, it is possible to cause the accident data recording means 203 to record the data of the vehicle operation information having the highest practical use as possible.

Sixthly, in the vehicle accident recording apparatus according to any one of the above items 1 to 5, while the time is taken on the horizontal axis, the data of the vehicle operation information and the running state of the vehicle at a certain time before and after the accident are taken. Display means for displaying the graphed data on the vertical axis and the time at the time of occurrence of the accident as the same parameter at the same point on the horizontal axis, the display means being detachable on the vehicle or outside the vehicle. It has a characteristic display means.

As described above, the time axis is set on the horizontal axis, and the same point on the horizontal axis coincides with the time of the occurrence of the accident, so that the data of the vehicle operation information and the running state of the vehicle at a certain time before and after the accident are obtained. By displaying these data in a graph, the display means according to the present invention can provide more clear and simple data for accident analysis by displaying these two data at a glance. .

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle accident recording apparatus according to the present invention will be described below in detail with reference to the drawings. (Embodiment 1) FIG. 1 is a diagram showing an outline of a configuration of a vehicle accident recording apparatus according to the present invention. FIG. 2 is a diagram showing a memory map in the nonvolatile recording area 300 of the operation data recording means 101. FIG. 3 is a diagram schematically showing an outline of a recording area of the accident data recording means 203. In the description of the present embodiment and in FIG. 1 and the like, the structure and function of the operation recorder 100 itself can be the same as those of a general operation recorder, so that the description will be simplified. The details are also omitted. However, the operation data recording means 101 used by being attached to the operation recorder 100 is one of the important constituent elements according to the present invention, and the details thereof will be described below.

The vehicle accident recording device 200 according to the present invention
A vehicle accident recording device 200 installed in a vehicle having a vehicle operation data recording unit 101 that records at least time-series vehicle operation information including a traveling state as data. Detecting means 201 for detecting the occurrence of an accident, an accident data collecting means 202 for collecting data of the running state of the vehicle at a certain time before and after the accident, and an accident data recording means 203 for recording the data. I have.

The vehicle operation data recording means 101 is mounted on a commercial vehicle and operates in various manners such as the operation state of the vehicle, that is, the engine ON / OFF, the traveling speed, the continuous traveling distance, and the bias of the loading state. A recording means which is installed in a device called a so-called vehicle operation recorder which records the situation by converting the situation into data for one to two weeks and records the data.
This is recording means using an EPROM.

When the detection of the occurrence of an accident is detected by the detection means 201, the vehicle accident recording device 200
Writing means 205 for writing data on the running state of the vehicle within a fixed time of about 10 seconds to 1 minute before and after the accident to the operation data recording means 101 via the transmission means 204
It has.

Further, vehicle operation data recording means 101
Is recording means provided with a nonvolatile recording area 300 for holding data once written. The vehicle operation data recording means 101 and the accident data recording means 20
All 3 are mounted detachably from the vehicle. That is, the vehicle operation data recording means 101 is a recording means having an IC card shape and an external EEPROM as described above, and the accident data recording means 203 has an IC card shape and an EEPROM internally. It is preferable that the recording means be used. However, this accident data recording means 203 is required to avoid inconveniences such as an increase in manufacturing cost and complication of the device mechanism.
Instead of a C-card shape, a nonvolatile memory element such as an EEPROM of a normal mounting form may be used.

The detecting means 201 constantly monitors acceleration data in at least three degrees of freedom, ie, forward and backward (x), left and right (y), and up and down (z) in the traveling direction of the vehicle on which it is mounted, every 30 ms. doing. Then, the acceleration due to the shock expected to occur at the time of occurrence of the accident is preset as a threshold value. When the monitored acceleration data is equal to or greater than the threshold value, the detection means 201 determines that an accident has occurred.

The accident data collection means 202 includes acceleration data which is constantly monitored by the detection means 201 every 30 ms, and other information (for example, before and after the accident) which is preset as a monitoring target according to necessity. The driver's brake operation and steering operation for 10 seconds are converted into data and collected. That is, as the data collected by the accident data collection means 202,
Although it is at least the acceleration data of the vehicle, it is preferable to collect other data such as the driver's brake depression amount and the steering wheel turning angle.

The writing means 205 detects that an accident has occurred.
If detected at 01, it was recorded before the accident 1
Data on the running state of the vehicle within a fixed time of about 0 seconds to 1 minute is read out from the accident data recording means 203 described later and written into the operation data recording means 101. After that, the data of the running state of the vehicle within a fixed time of about 10 seconds to 1 minute after the occurrence of the accident is also stored in the operation data recording means 1.
Write to 01.

The accident data recording means 203 stores the acceleration data for 10 seconds before and after the occurrence of the accident, as well as data such as the brake depression amount and the steering wheel turning angle. More specifically, the accident data recording unit 203 monitors the above data every 30 ms, and records the first 10 s of the recording area 4 of the total 20 s of the recording area 400.
01 is always about 333 (log) data (G (t)) 402-1 and 402- from the current time to 10 seconds before.
2, ... 402-333 are recorded. Every time 30 ms elapses, the oldest data, that is, the data 402-332 logs earlier than the data monitored at the current time.
1 is erased, and instead, the latest, that is, the 334th data 402-334 (not shown) is recorded at the present time ...
Thus, the data is rewritten to the necessary minimum every 30 ms.

On the other hand, for 10 seconds after the occurrence of the accident, the writing is started after the occurrence of the accident is detected by the detecting means 201, and the data 403-1 to 103-1 for 10 seconds thereafter
403-333 are monitored every 30 ms, and are sequentially written to the recording area 404. By such a writing method, the accident data recording means 203 has already processed and recorded the most important detailed data immediately before the accident, at least before the occurrence of the accident, in the non-volatile memory at the time of the accident analysis. Therefore, even if the data processing mechanism or the like of the accident data recording device is damaged by the strong impact of the accident, the important detailed data immediately before the accident can be surely retained before the accident.

Furthermore, detailed data immediately before the accident, which is the most important in the accident analysis, is written in the writing means 20.
5 is also written into the operation data recording means 101 via the transmission means 204, so that even if one of the recording means is damaged and cannot be read, it is also recorded on the other. And data can be held at a high safety factor. Therefore, it can be reliably provided as important data at the time of accident analysis.

In addition, since the detailed data before and after the accident is also written in the operation data recording means 101, the data recorded in the operation data recording means 101 is read out, so that the operation data for one to several days and the data before and after the accident can be obtained. Using together with the detailed data of about 10 seconds, it is possible to simultaneously understand the occurrence state of the accident and to clarify the original cause of the accident that has caused the accident at a glance.

Next, the operation of the vehicle accident recording device according to the first embodiment of the present invention will be described. FIG. 4 is a schematic flowchart showing an outline of the operation of the vehicle accident recording device according to the first embodiment of the present invention. The detecting means 201
Forward and backward (Gx), left and right (Gy), up and down (G
In z), acceleration data in each direction is constantly monitored every 30 ms (step 1; hereinafter, abbreviated as s1).

If the value of the acceleration data does not exceed a predetermined threshold value Gth as the acceleration corresponding to the occurrence of the accident (N in s2, 3, 4), no accident has occurred. Normal data processing is performed. That is, Gx, Gy, and Gz are recorded in the accident data recording means (s5).

On the other hand, although not shown in FIG. 4, while these s1 to s4 are being executed on the side of the vehicle accident recording device 200, various types of vehicle operation data are concurrently displayed on the side of the vehicle operation recorder 100. Needless to say, the vehicle operation data recording means 101 is continuously recording the data.

If any one of Gx, Gy and Gz exceeds the threshold value Gth, the detecting means 20
1 determines that an accident has occurred in the vehicle (s2, 3,
4 Y). When the detection means 201 detects the occurrence of an accident in this way, the accident data collection means 202 outputs Gx, Gy, Gz
Begin collecting and recording detailed data after the accident, including:
On the other hand, detailed data during the previous 10 s before the occurrence of the accident is kept stored in the accident data recording means 203, and rewriting of the data is stopped (s6).

Then, the writing means 205 is turned on (s
7) The detailed data for 10 seconds before the occurrence of the accident is read out from the accident data recording means 203 and written into the vehicle operation data recording means 101 at a stretch (s).
8). At this time, the detailed data for 10 seconds before the occurrence of the accident is recorded in an accident recording area 301 provided in advance in the recording area 300 of the vehicle operation data recording means 101 as shown in FIG. In a recording area 300 of the vehicle operation data recording means 101, an operation data recording area 30 for recording operation data of the corresponding vehicle for one to several days.
2. A management data area 303 or the like in which information such as management items as a vehicle operation recorder is recorded is allocated.

After the writing of the detailed data for 10 s before the occurrence of the accident in the vehicle operation data recording means 101 is completed (s9), the writing means 205 next turns to the vehicle operation data recording means 101 of the detailed data after the accident. The writing to the memory is started (s10). Then, the writing is continued until the writing is completed (N in s11). When the writing is completed, the main operation according to the present invention is completed.

An example of a case where the vehicle operation data recording means 101 according to the present invention in which the above-described writing has been executed is taken out of the vehicle and displayed as a graph on an external display means 500 according to the present invention. Is shown in FIG. As the display means 500, it is preferable to display a graph on a display screen such as a liquid crystal display panel using, for example, a personal computer as an analysis means. In this manner, the time axis t is plotted on the horizontal axis, and the same point on the horizontal axis t is matched with the time of occurrence of each other, and the graph 501 of the vehicle operation information and the travel of the vehicle for a certain time before and after the accident are obtained. By displaying the state data graph 502 together, the display unit 500 according to the present invention enables the
By displaying the two data at a glance, it is possible to provide visual information based on the data for performing the accident analysis clearly and easily. Note that the process itself of graphing vehicle operation data and detailed data before and after the accident, which is performed inside the display means 500, that is, the horizontal axis represents a time axis t which is a common parameter, and the vertical axis represents acceleration or the like. The data itself is converted to a graph display by taking each of the variables and displaying it in the form of a graph as shown in FIG. (Thus, a detailed description thereof has been omitted in this specification.)

(Embodiment 2) FIG. 6 is a diagram showing a schematic configuration of an accident data recording apparatus according to a second embodiment. In the first embodiment, when the occurrence of an accident is detected by the detecting unit 201, data on the running state of the vehicle within a fixed time of about 10 seconds to 1 minute before and after the accident is transmitted via the transmitting unit 204. An example of writing to the operation data recording means 101 has been described, but on the contrary,
Among the data of the vehicle operation information recorded in the vehicle operation data recording means 101, data including at least a certain time before and after the accident and over a longer time is read out by the reading means 206 via the transmission means 204. Alternatively, the accident data may be recorded in the accident data recording means 203. However, at this time, the accident data recording means 203 includes
A new recording area must be provided as a place for writing the data to be transmitted and written.On the other hand, both the data and the accident data are stored in the accident data recording device that is formed with high durability against damage. This is preferable because the advantage of recording can be obtained.

At this time, in this embodiment,
It is conceivable that the transmission path (transmission means 204) or data processing mechanism may be damaged before the data transmission is completely completed. By reading out and transmitting the data of a large amount of vehicle operation data that is closer in time to the accident first, the vehicle operation data that is effective for analysis as long as possible is stored in the accident data recording means. 203 can be recorded. Alternatively, the data may be recorded in a more compact form by compressing the vehicle operation data.

In this way, by recording the vehicle operation data in the accident data recording means 203, an outline of the operation state of the vehicle over a long period of time of about one day to two weeks can be obtained in substantially the same manner as in the first embodiment. It is possible to record short but detailed data before and after the accident together with the above data, enabling effective use for cause analysis etc. after the accident and realizing the effect of displaying those data at a glance. it can.

In each of the above embodiments, a transmission element and an I / F (interface) are used as the transmission means 204 at both ends of the optical communication line. For this reason, a detailed transmission means such as a more general wire for wiring in a vehicle may be used. In any case,
It goes without saying that it is desirable that the transmission means 204 has as little possibility as to be damaged by a strong impact in the event of an accident.

[0048]

As described above in detail, according to the present invention, it is possible to analyze the state of an accident at the time of occurrence and to obtain data which enables the original cause of the accident to be clarified. A recordable vehicle accident recording device can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing an outline of a configuration of a vehicle accident recording device according to the present invention.

FIG. 2 is a diagram schematically showing a memory map in a nonvolatile recording area 300 of the operation data recording means 101.

FIG. 3 is a diagram schematically showing an outline of a recording area of an accident data recording unit 203.

FIG. 4 is a schematic flowchart showing an outline of an operation of the vehicle accident recording device according to the first embodiment of the present invention.

FIG. 5 is a diagram showing an example of a case where the vehicle operation data recording means 101 according to the present invention is taken out of a vehicle and data recorded therein is displayed as a graph on an external display means 500 according to the present invention. .

FIG. 6 is a diagram illustrating a schematic configuration of an accident data recording device according to a second embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 vehicle operation recorder 101 vehicle operation data recording unit 200 vehicle accident recording device 201 detection unit 202 accident data collection unit 203 accident data recording unit 204 transmission unit 205 writing unit 206 reading unit 500 Display means

Claims (6)

[Claims] 1. A vehicle accident recording device installed in a vehicle having vehicle operation data recording means for recording time-series vehicle operation information including at least a driving state as data, wherein an accident occurs in the vehicle. A vehicle accident comprising: detecting means for detecting the occurrence of the accident; accident data collecting means for collecting data on the running state of the vehicle at a certain time before and after the accident; and accident data recording means for recording the data. The recording device, further comprising: a writing unit that writes data of a running state of the vehicle for a certain period of time before and after the accident to the operation data recording unit via a transmission unit when the occurrence of the accident is detected. Vehicle accident recording device characterized by the above-mentioned. 2. The vehicle accident recording device according to claim 1, wherein the vehicle operation data recording unit is a recording unit having a nonvolatile storage area for holding data once written in a nonvolatile manner. Vehicle accident recording device. 3. The vehicle accident recording device according to claim 1, wherein at least one of the vehicle operation data recording unit and the accident data recording unit is mounted detachably from the vehicle. Vehicle accident recording device. 4. A vehicle accident recording device installed in a vehicle having vehicle operation data recording means for recording at least time-series vehicle operation information including at least a traveling state as data, wherein the vehicle has an accident. A vehicle accident record including detection means for detecting the occurrence of the accident, accident data collection means for collecting data on the running state of the vehicle for a certain period of time before and after the accident, and accident data recording means for recording the data In the apparatus, when the occurrence of the accident is detected, the data of the vehicle operation information stored in the vehicle operation data recording means includes data at least including a certain time before and after the accident and including data longer than this time. A vehicle accident recording apparatus for reading out the data via a transmission means and recording the data in the accident data storage means. 5. The vehicle accident recording device according to claim 4, further comprising a reading unit that reads the data of the vehicle operation information first from data closer in time to the accident. Vehicle accident recording device. 6. The vehicle accident recording apparatus according to claim 1, wherein time is taken on a horizontal axis, while data of the vehicle operation information and data of a running state of the vehicle at a certain time before and after the accident are obtained. A display means for displaying the respective graphs with the vertical axis as the vertical axis, and aligning the display at the same point on the horizontal axis with the time at the time of occurrence of the accident as a parameter. A vehicle accident recording device, comprising: