JP2000168634A - Odograph for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an odograph for an automobile, which can record accelerations and GPS signals before and after an accident without the necessity of maintenance such as replacement of a recording sheet or ink, by using an LSI memory chip as a recording medium, and which can exhibit a detailed condition of the accident by analyzing the recorded accelerations and GPS signals. SOLUTION: An odograph from an automobile, comprises an acceleration sensor for detecting an acceleration of a vehicle, a GPS receiver for detecting a position of the vehicle, a timer having capable of automatic correction for a time error, an impact sensor for detecting an impact upon accident, and a memory for recording numerical values from the acceleration sensor and numerical values of the GPS signals along the time. The memory repeats updating and recording the data while newest data being retained, that is, data several minutes before and after an accident are retained in such a case that the impact sensor detects 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 running recorder, and more particularly to a vehicle running system which records acceleration and GPS signals before and after an accident and analyzes them after the accident to grasp the detailed situation of the accident. It relates to a recording device.

[0002]

2. Description of the Related Art In recent years, traffic accidents have frequently occurred with an increase in traffic volume, and after the accidents, the cause of the accident has been investigated from traces of tires and damage to vehicles. By analyzing these data, measures to prevent accidents are being studied. Some vehicles are equipped with a travel recording device such as a tachograph, and for vehicles equipped with these devices, the tachograph is analyzed after an accident and used to grasp the situation of the accident.

[0003]

When a running vehicle causes an accident, the driver performs a driving operation to avoid the accident during a few seconds from the discovery of the abnormality to the occurrence of the accident. However, the driving operation time for avoiding the accident and the change in the speed of the car for a few seconds or tens of seconds until the car stops after the occurrence of the accident, the change in acceleration due to the impact of the accident, its direction, the driving of the car position, etc. There was a problem that the situation could not be fully grasped depending on the trace of the tire and the damage situation of the vehicle. In addition, tachographs record changes in speed during running in chronological order, but changes in vehicle speed for a short period of time, several seconds to several tens of seconds, before and after an accident, and changes in acceleration and direction due to the impact of an accident No detailed data could be obtained for In addition, tachograph exchange of exclusive recording paper,
There is a problem that the ink needs to be replaced. The present invention has been made to solve such a conventional problem, and an object of the present invention is to use a LSI memory chip as a recording medium, thereby requiring maintenance such as replacement of recording paper and ink. Another object of the present invention is to provide an automobile travel recorder that records the acceleration and GPS signals before and after the accident and analyzes the signals after the accident to grasp the detailed situation of the accident.

[0004]

According to a first aspect of the present invention, there is provided an automobile travel recording apparatus, comprising: an acceleration sensor for detecting acceleration of a vehicle; and a GPS receiver for detecting a position of the vehicle. Machine, a timer having an automatic time error correction function, an impact sensor for detecting an impact at the time of an accident, and a memory for recording the value of an acceleration sensor and the value of a GPS signal along with time. The update record was repeated while leaving the above data, and data was recorded for several minutes before and after the accident when the impact sensor detected the accident.

According to a second aspect of the present invention, the acceleration sensor detects the acceleration in the front-rear direction and the left-right direction of the vehicle.

According to a third aspect of the present invention, in the vehicle travel recorder according to the first or second aspect, the memory is configured to record acceleration, latitude, and longitude in units of 1/100 second. .

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an automobile driving recorder according to an embodiment of the present invention, FIG. 2 is a flowchart showing the operation of the automobile driving recorder, and FIGS. 3 to 5 are explanatory views showing recording states in a memory. FIG. 6 is an explanatory diagram showing changes in acceleration and speed at the time of an accident. As shown in FIG. 1, an automobile travel recording device according to one embodiment of the present invention includes an acceleration sensor that detects an acceleration of a vehicle, a GPS that detects a position of the vehicle, a timer that displays time,
An impact sensor that recognizes the impact of the accident, and a microprocessor that recognizes and processes signals from the respective sensors,
The main configuration is a memory for recording signals processed by the microprocessor.

The acceleration sensor detects an inertial force applied to the pendulum, and detects a longitudinal acceleration and a lateral acceleration based on the distortion. The distortion of the pendulum is converted into an electric signal and recorded in a memory via a microprocessor. The GPS is a device called (Global Positioning System), which is a system that receives radio waves from four or more of the 24 GPS satellites launched by the United States at the same time and estimates the position of the receiver. Since the positions of the satellites are almost exactly known, the distance to each satellite and the current position are known from the arrival time of the radio wave. There are two types of signals transmitted by GPS satellites: high-precision radio waves and slightly lower-precision radio waves.
The position of the user can be detected within a range of 200 m. For this reason, it is possible to accurately detect the position of the vehicle by combining with the topographic map.

The timer is a quartz clock type digital clock, and has a function of receiving time information based on a cesium atomic clock and automatically correcting the time. Currently in Japan it is possible to catch the Japanese standard radio wave emitted from Miwa Town, Ibaraki Prefecture. In addition, the same effect is obtained when detecting a time signal pulse from a radio broadcast or the like. As described above, since the time is corrected by itself, a minute error (2 to 3 seconds / month) of the quartz oscillation type clock is given.
Can be periodically corrected to always maintain the correct time. Note that the clock is not limited to the crystal transmission type, and a clock having another configuration can be used, and a time signal pulse from a satellite can be received as a radio wave to be received.

The impact sensor is constituted by several deceleration detecting sensors provided at the front of the vehicle and at various places in the room, and detects the deceleration at the time of collision to recognize an accident. The shock sensor can be replaced by an acceleration sensor.

The microprocessor is an acceleration sensor;
It has the function of organizing and integrating GPS, timer, and shock sensor signals, integrating them in chronological order, and sending them to memory. As the memory, an LSI memory can be used, and a memory having a structure that can withstand an impact at the time of a collision is used, and a non-volatile memory that retains stored information even when electricity is cut off is used. The memory has a storage capacity of several minutes, and has a function of sequentially updating and recording new data while deleting old data. Using two or more memories,
It is also possible to record updates alternately. The memory is provided with an output terminal for outputting recorded contents, and data is output to a display device via a microprocessor after an accident.

Next, the operation of the vehicle running recorder will be described with reference to FIG. Here, S1, S2,... Used in the flowchart show the numbers of procedures (steps). When the automobile starts running, the acceleration sensor detects the acceleration of the vehicle, and records the acceleration in a memory in a time series through the microprocessor (S1). Also, GP
S detects the current position of the vehicle and records the latitude and longitude in a memory in a time series through a microprocessor (S
2). Then, while the normal traveling is continued, the memory repeats the update record while leaving the latest several minutes of data.
When an accident occurs in S3, the impact sensor detects a sudden negative acceleration and recognizes the accident (S4). When an accident is detected, acceleration, latitude and longitude are recorded for n minutes to record the situation of the car after the accident (S5, S6).
This makes it possible to know the behavior of the driver after the accident. The time recorded in the memory is the cause of the accident,
It is necessary to have a length that can grasp the situation, the result, etc., and the value of n minutes after the accident is shorter than several minutes before the accident. When n minutes have elapsed after the occurrence of the accident in S7, the memory function is stopped,
Data for several minutes before and after the accident is recorded in the memory (S8). Here, since the timer has an automatic time correction function, the acceleration and the GPS signal along with the accurate time are recorded.

The values of the acceleration sensor and GPS are shown in FIGS.
It is recorded in a table as shown in the explanatory diagram of FIG. 3 to 5
Table shows acceleration, latitude,
The longitude is recorded in chronological order. (Seconds after the decimal point indicate 1/60 of a second.) A portion surrounded by a frame in the figure is a numerical value recorded in the memory, and a portion outside the frame is a numerical value calculated based on each data. For example, FIG.
As shown in, the first number recorded in memory is
21 minutes and 40.00 seconds, vehicle acceleration in the front-rear direction is 0 m /
sec ² , the acceleration in the left-right direction is 0 m / sec ² .
In this state, it is confirmed that the vehicle has stopped. Immediately after that, at 21 minutes and 40.10 seconds, the longitudinal acceleration was 0.21.
m / sec ² , lateral acceleration is 0.002 m / sec
c ² next, it starts to advance while shaking slightly laterally is confirmed. In addition, the position of the vehicle is determined by GPS (North latitude 32 degrees 45 minutes 37.1 seconds, east longitude 129 degrees 52 minutes 31.
9 seconds).

As described above, since the acceleration, the latitude, and the longitude that change in units of 1/60 second are recorded, the speed, the traveling direction, the traveling distance, and the section distance shown outside the frame can be calculated from the data. it can. The calculation data can be directly recorded in the memory, but it is also possible to take out the data after the accident and perform the calculation.

At the time shown in FIG. 4A, a decrease in acceleration has been confirmed. In this example, point A (21 minutes 48.
It is estimated that deceleration action to avoid the accident was started at 40 seconds), and then point B (21 minutes 49.4) one second later
At 0 seconds), it is confirmed that a collision has occurred. In this way, the accident can be confirmed from the sudden negative acceleration,
The impact sensor recognizes the impact at the time of the accident and stops the memory after a few minutes. FIG. 5 shows a graph before and after the accident, and shows a sharp decrease in acceleration and a sharp decrease in speed at point B (21 minutes 49.40 seconds). By superimposing such data on a map, it is possible to accurately grasp the approach route of the vehicle, the collision location, the collision speed, and the like.

Although the embodiment of the present invention has been described above, the specific configuration of the present invention is not limited to this embodiment, and there are design changes and the like within a range not departing from the gist of the invention. This is also included in the present invention. As the sensor described in the above embodiment, it is also possible to mount a steering wheel steering angle sensor, an accelerator opening degree sensor, etc. is there. In the above embodiment, recording is performed in units of 1/60 second. However, the case of recording in units of 1/100 second is also included in the present invention.
Further, as the GPS described in the above embodiment,
The same operation and effect can be obtained even with a configuration for receiving radio waves from another satellite or a configuration for receiving radio waves from the ground.

[0017]

As described above, in the vehicle running recorder according to the first aspect of the present invention, the acceleration sensor for detecting the acceleration of the vehicle and the G for detecting the position of the vehicle are provided.
Since a PS receiver, a timer having an automatic time error correction function, an impact sensor for detecting an impact at the time of an accident, and a memory for recording the value of the acceleration sensor and the value of the GPS signal along time, The driving situation at the time of the accident is recorded in the memory, and the speed, position, and the like of the vehicle can be accurately grasped. Further, by superimposing the map and the data in the memory, it is possible to accurately grasp the approach route of the vehicle and the collision state. Further, since the timer has an automatic time correction function, the time is always displayed accurately without the need for manual time correction.

According to a second aspect of the present invention, since the acceleration sensor is configured to detect the acceleration in the front-rear direction and the left-right direction of the vehicle, it is possible to accurately confirm the lateral vibration and collision of the vehicle. be able to.

According to a third aspect of the present invention, in the vehicle travel recording apparatus, the memory stores the acceleration, the latitude, and the time in hundredths of a second.
Since the longitude is recorded, detailed data of the accident can be obtained. In addition, since the acceleration, the latitude, and the longitude are recorded in time series, the recording format is simple, and the speed, the traveling direction, the traveling distance, and the like can be calculated from these data.

[Brief description of the drawings]

FIG. 1 is a block diagram of a vehicle driving recorder according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the vehicle travel recorder.

FIG. 3 is an explanatory diagram showing a recording state in a memory.

FIG. 4 is an explanatory diagram showing a recording state in a memory.

FIG. 5 is an explanatory diagram showing a recording state in a memory.

FIG. 6 is an explanatory diagram showing changes in acceleration and speed at the time of an accident.

Claims (3)

[Claims] 1. An acceleration sensor for detecting acceleration of a vehicle, a GPS receiver for detecting a position of the vehicle, a timer having an automatic time error correction function, an impact sensor for detecting an impact at the time of an accident, Along with a memory for recording the value of the acceleration sensor and the value of the GPS signal, wherein the memory repeats the update record while leaving the latest data, and when the impact sensor detects an accident, it stores data for several minutes before and after the accident. An automobile driving recorder characterized by leaving. 2. The acceleration sensor according to claim 1, wherein the acceleration sensor detects acceleration in a front-rear direction and a left-right direction of the vehicle.
The driving record device for an automobile according to the above. 3. The vehicle travel recording apparatus according to claim 1, wherein the memory records acceleration, latitude, and longitude in units of 1/100 second.