WO2022040871A1

WO2022040871A1 - Accident data saving method and apparatus for driving recorder

Info

Publication number: WO2022040871A1
Application number: PCT/CN2020/110850
Authority: WO
Inventors: 朱帆; 尚明生; 陈琳
Original assignee: 中国科学院重庆绿色智能技术研究院
Priority date: 2020-08-24
Filing date: 2020-08-24
Publication date: 2022-03-03
Also published as: CN114402376A

Abstract

An accident data saving method and apparatus for a driving recorder. The method comprises the following steps: obtaining the tri-axial acceleration data of a vehicle and the vehicle speed data of the vehicle, wherein the tri-axial acceleration data comprises the acceleration data of the vehicle in the left-right, front-back, and up-down directions; determining whether the tri-axial acceleration data at the current time meets a preset condition; if yes, recording a state at the current time as an emergency state, and recording a vehicle state after a time corresponding to the emergency state; and if the vehicle fully stops within 15-30 seconds, marking driving data at the time corresponding to the emergency state and within 30 seconds before and after the time as important data, and saving the driving data. Obtaining data from the chassis of the vehicle and analyzing same to obtain accident data can better provide long-term data that is needed by the driving recorder and a black box, and store the data, thereby avoiding the driving recorder and the black box from being affected by a memory, and avoiding the accident data from being cyclically covered.

Description

A method and device for saving accident data of a driving recorder

technical field

The invention belongs to the technical field of vehicle data information storage, and in particular relates to a method and device for saving accident data of a driving recorder.

Background technique

At present, the traffic safety situation is becoming more and more severe, traffic accidents occur frequently, and casualties and property losses are heavy; and in the process of traffic accident handling and analysis, accidents caused by vehicle failures often have difficulties in technical analysis and responsibility definition. The reason is that the key vehicle status data cannot be effectively saved, and the driving conditions of the vehicle at the time of the accident cannot be reproduced, and the driving recorder and the black box will cyclically overwrite the saved data due to memory reasons, making it difficult to save the accident data. In the future, with the acceleration of the intelligent process of automobiles, the problem of defining and distinguishing the responsibilities of people and vehicles in traffic accidents will become increasingly prominent. How to correctly divide the responsibilities depends on the in-depth analysis of the vehicle status in the event of the accident, the preservation and Records also appear more necessary.

The current data storage methods include: using on-board instruments. The on-board instrument system is a device in the automotive electronic system that reflects the working conditions of various systems of the vehicle, and is mainly used to indicate the operating conditions of the vehicle. In the existing on-board instrument system architecture, the system passes The status data obtained by the bus will be discarded after being output and displayed by the liquid crystal instrument. The system does not have the function of data recording and storage, and cannot provide data playback, and cannot provide decision-making reference for the analysis of vehicle driving status. The data is not fully utilized, resulting in a huge waste of resources; another data preservation method is to analyze the running state of the vehicle through the data of the vehicle chassis, and save the driving data in the accident state, while in the prior art, The driving recorder and black box of the vehicle do not directly receive the information of the vehicle chassis, so they cannot obtain the driving data of the vehicle chassis. to save.

SUMMARY OF THE INVENTION

In view of this, one of the objectives of the present invention is to provide a method for saving accident data of a driving recorder, which can save the accident data in driving for a long time.

For achieving the above object, the technical scheme of the present invention is:

A method for saving accident data of a driving recorder, comprising the following steps:

Obtain three-axis acceleration data of the vehicle and vehicle speed data of the vehicle; the three-axis acceleration data include the left and right acceleration, the front and rear acceleration, and the up and down acceleration of the vehicle;

When the three-axis acceleration at the current moment satisfies one of the following conditions:

|x|>1.5±0.25m/s ² ;

|y|>3.0±0.25m/s ² ;

|z|>0.3±0.05m/s ² ;

|y′|>2.0±0.25m/s ³ ;

Among them, x is the left and right acceleration, y is the front and rear acceleration, z is the up and down acceleration, and y' is the rate of change of the front and rear acceleration;

Record the state at the current time as an emergency state, and record the vehicle state after the time corresponding to the emergency state; if the vehicle stops completely within 15 to 30 seconds, mark the corresponding time of the emergency state and the driving data for 30 seconds before and after it as important data, save it.

Further, the three-axis acceleration data of the built-in IMU of the vehicle is obtained from the chassis analysis.

Further, the driving recorder of the vehicle is connected to the black box on the canbus, communicates with the chassis, and analyzes the three-axis acceleration data of the built-in IMU of the vehicle from the chassis.

Further, when the speed of the vehicle is less than 1 km/h, it is considered that the vehicle is completely stopped.

Further, the important data is stored in the driving recorder or the black box, and will not be overwritten by circulation.

In view of this, the second purpose of the present invention is to provide an accident data storage device related to a driving recorder, which can store accident data in driving for a long time.

In order to achieve the above purpose, the technical scheme of the present invention is: a driving recorder accident data storage device, comprising:

a data receiving module for obtaining three-axis acceleration data of the vehicle and vehicle speed data of the vehicle; the three-axis acceleration data includes the left and right acceleration, the front and rear acceleration, and the up and down acceleration of the vehicle;

A data calculation module, connected with the data receiving module, is used to calculate the rate of change of the front and rear acceleration of the vehicle, and to calculate that the three-axis acceleration at the current moment satisfies one of the following conditions, and if it is satisfied, the state at the current moment is marked as an emergency state :

|x|>1.5±0.25m/s ² ;

|y|>3.0±0.25m/s ² ;

|z|>0.3±0.05m/s ² ;

|y′|>2.0±0.25m/s ³ ;

The data storage module is connected to the data calculation module, and is used to record the vehicle state after the emergency state corresponds to the time when the data calculation module marks the emergency state. If the vehicle stops completely within 15 to 30 seconds, the emergency state will be The time corresponding to the state and the driving data before and after 30 seconds are marked as important data and saved.

Further, the data receiving mode includes a driving recorder and a black box; the driving recorder and the black box are connected to the canbus and communicate with the vehicle chassis.

Further, the data receiving module obtains the three-axis acceleration data of the built-in IMU of the vehicle from the chassis analysis.

Further, the important data saved in the data saving module will not be cyclically overwritten.

The beneficial effects are as follows: the present invention provides a method and device for saving the accident data of the driving recorder. By obtaining the driving data from the chassis of the vehicle, and analyzing and selecting accurate accident data, the driving recorder and the black box can improve the selection of accident data storage in the actual situation. Accuracy, reduce the accident data due to inaccurate judgment of accident data, or treat ordinary driving data as accident data, which leads to memory loss and complicated queries; parallel car recorder and black box analyze the accident data. Long-term storage avoids the dash cam and black box from being affected by the memory, and the saved data is overwritten cyclically, resulting in the situation that the accident data is overwritten and cannot be queried.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that are required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a schematic structural diagram of a driving recorder accident data storage device of the present invention;

FIG. 2 is a flow chart of a method for saving accident data of a driving recorder according to the present invention.

detailed description

To make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The examples are given to better illustrate the present invention, but the content of the present invention is not limited to the examples. Therefore, those skilled in the art make non-essential improvements and adjustments to the embodiments according to the above-mentioned contents of the invention, which still belong to the protection scope of the present invention.

Example 1

Referring to FIG. 1, it is a schematic structural diagram of a driving recorder accident data storage device of the present invention. Specifically, a driving recorder accident data storage device includes:

The data receiving module 1 is used to obtain the three-axis acceleration data of the vehicle and the speed data of the vehicle;

In this embodiment, the data receiving module 1 includes a driving recorder and a black box; the driving recorder and the black box are connected to CANBUS (controller area network bus technology) and communicate with the vehicle chassis, and the data receiving module 1 analyzes the chassis to obtain the vehicle's built-in IMU (Inertial sensor) triaxial acceleration data, the triaxial acceleration data includes the vehicle's left and right, front and rear, up and down acceleration data; in other embodiments, the data receiving module 1 can also receive the triaxial acceleration data from GPS, vehicle radar, etc. and vehicle speed data;

The data calculation module 2 is connected to the data reception module 1, and is used to calculate the rate of change of the front and rear acceleration of the vehicle, and to calculate the three-axis acceleration at the current moment if one of the following conditions is satisfied, if it is satisfied, the state at the current moment is marked as an emergency state:

|x|>1.5±0.25m/s ² ;

|y|>3.0±0.25m/s ² ;

|z|>0.3±0.05m/s ² ;

|y′|>2.0±0.25m/s ³ ;

The data storage module 3 is connected to the data calculation module, and is used to record the vehicle state after the emergency state corresponds to the time after the data calculation module marks the emergency state. If the vehicle stops completely within 15 to 30 seconds, the emergency state corresponds to the time and The driving data before and after 30 seconds is marked as important data and saved;

In this embodiment, after the data calculation module is marked as an emergency state, in actual circumstances, the driver will drive the vehicle to decelerate and stop. Therefore, in this embodiment, it is determined whether the emergency state is in the emergency state by decelerating and stopping the vehicle for a period of time in the future. Whether it is a real emergency state, that is, an accident state, or an accidental emergency state; when the vehicle stops completely (in this embodiment, when the vehicle speed is less than 1km/h, the vehicle is considered to be completely stopped), that is, the emergency state is determined as a real emergency. state, the accident data before and after the real emergency state needs to be stored for a long time through the data receiving module 1;

Preferably, in this embodiment, when it is important data, the important data is stored in the data storage module, and in this embodiment, the important data is marked so that the important data is not affected by the driving recorder. , Black box memory impact, important data will not be overwritten by loop.

Example 2

Referring to FIG. 2, it is a flowchart of a method for saving accident data of a driving recorder according to the present invention. Specifically, a method for saving accident data of a driving recorder includes the following steps:

S400: obtain the three-axis acceleration data of the vehicle and the speed data of the vehicle; then perform step S500;

In this embodiment, the driving recorder of the vehicle is connected to the black box on the CANBUS, communicates with the chassis, and analyzes the three-axis acceleration data of the vehicle's built-in IMU from the chassis; the three-axis acceleration data includes the vehicle's left and right, front and rear, and up and down acceleration data;

In practice, when the vehicle chassis information is communicated through CANBUS, different models will have different information formats, and the CANBUS message is in the format of 8 bytes=64bit, because the format is different, when receiving the information of the vehicle chassis, it needs Adaptation, but when the vehicle is a commercial truck, since the chassis information of the commercial truck is in a standard format, it only needs to be adapted to CANBUS once, and it can be applied to all commercial trucks. If the vehicle is an ordinary passenger car, the chassis information is a hard model. However, when communicating through CANBUS, it needs to be adapted one by one; after adaptation, the three-axis acceleration data of the IMU can be obtained from the chassis through CANBUS analysis;

S500: determine whether the three-axis acceleration satisfies the preset condition; then execute step S600;

In this embodiment, when the three-axis acceleration at the current moment satisfies one of the following conditions, it is deemed that the preset condition is met, and then step S600 is performed; otherwise, step S400 is continued:

|x|>1.5±0.25m/s ² ;

|y|>3.0±0.25m/s ² ;

|z|>0.3±0.05m/s ² ;

|y′|>2.0±0.25m/s ³ ;

Among them, x is the left and right acceleration, y is the front and rear acceleration, z is the up and down acceleration, and y' is the rate of change of the front and rear acceleration, which is considered to meet the preset conditions;

S600: Record the state at the current moment as an emergency state, and record the vehicle state after the time corresponding to the emergency state; then perform step S700;

In this step, S500 is used to analyze the three-axis acceleration to determine whether the current state is an emergency state. In a moment, when the vehicle turns, the absolute value of the left and right acceleration of the vehicle is greater than 1.5m/s ² , or the vehicle is slightly under road conditions. The bad part is that the initial speed is relatively slow, and the absolute value of the left and right acceleration is greater than 1.25m/s ² , or in high-speed and other road sections, the initial speed is relatively high, and the absolute value of the left and right acceleration is greater than 1.75m/s ² . The turning speed is too fast, it should be an emergency; at a certain moment, the vehicle accelerates or decelerates, and the absolute value of the front and rear acceleration of the vehicle is greater than 3m/s ² , or the initial speed is slow, and the absolute value of the front and rear acceleration is greater than 2.75m/s ² , or the initial speed is relatively high, the absolute value of the front and rear acceleration is greater than 3.25m/s ² , the acceleration or deceleration of the vehicle is too fast, and the current moment is marked as an emergency state; at a certain moment, the vehicle is shaking while driving, and the vehicle's The absolute value of the vertical acceleration is greater than 0.3m/s ² , or the initial speed is relatively slow, the absolute value of the vertical acceleration is greater than 0.25m/s ² , or the initial speed is relatively high, and the absolute value of the vertical acceleration is greater than 0.35m/s ² , the vehicle is shaking Severe, it is suspected to be an emergency state, and the current moment can be marked as an emergency state; in one embodiment, the absolute value of the change rate of the front and rear acceleration of the vehicle is greater than 2m/s ³ , or the initial speed is relatively slow, and the absolute value of the change rate of the front and rear acceleration changes If it is greater than 1.75m/s ³ , or if the initial speed is relatively high, the absolute value of the change rate of the front and rear acceleration is greater than 2.75m/s ³ , that is, at the current moment, the speed of the vehicle is unstable, and the current moment can be marked as an emergency state;

S700: Determine whether the vehicle has completely stopped within 30 seconds;

In this embodiment, the vehicle speed 15-30 seconds after the emergency state is obtained by continuously obtaining the vehicle speed from the chassis. When the vehicle stops within 15-30 seconds, step S800 is performed; otherwise, step S400 is continued;

After the emergency state is marked in step S600, it cannot be determined that an accident occurred at the moment corresponding to the emergency state. It may also be a driving problem of the vehicle caused by the current road conditions and environmental reasons. In general, if an accident occurs, the vehicle should be Stop after driving for a period of time. In this step, it will be marked 15 seconds after the corresponding time node of the emergency state, or considering the severity of the accident, you can choose to analyze the chassis speed after 30 seconds. If the vehicle stops, it can be proved The emergency state is an accident state, so that the accuracy of saving accident data by the driving recorder and the black box is improved, and the omission of accident data and the excessive storage of non-accident data are avoided;

Preferably, in this embodiment, when the speed of the vehicle is less than 1 km/h, it is deemed that the vehicle is completely stopped;

S800: Mark the driving data at the time corresponding to the emergency state and 30 seconds before and after it as important data and save it.

After the data calculation module is marked as an emergency state, in actual circumstances, the driver will drive the vehicle to decelerate and stop. Therefore, in this embodiment, it is determined whether the emergency state is a real emergency state by decelerating and stopping the vehicle for a period of time in the future. That is, the accident state, or the accidental emergency state; when the vehicle stops completely (in this embodiment, when the vehicle speed is less than 1km/h, the vehicle is considered to be completely stopped), that is, it is determined that the emergency state is a real emergency state, and the real emergency state is determined. The accident data before and after the corresponding time in the emergency state are stored for a long time;

Preferably, in this embodiment, when the important data is marked as important data, the important data is saved in the driving recorder and the black box, and the important data is set not to be affected by the memory of the driving recorder and the black box, and the data recorded in the future will not circulate. Overwrite the important data, which can be stored for a long time, and can be read and viewed later.

Further, in this embodiment, after marking the important data, the driving recorder and the black box can send the important data to the traffic bureau, the terminal of the vehicle owner, etc., so as to avoid damage to the black box and the driving recorder in an accident. Important data cannot be inquired, and accident analysis is difficult.

The embodiments of the present invention have been described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific embodiments, which are merely illustrative rather than restrictive. Under the inspiration of the present invention, without departing from the scope of protection of the present invention and the claims, many forms can be made, which all belong to the protection of the present invention.

Claims

A method for saving accident data of a driving recorder, comprising the following steps:

Obtain three-axis acceleration data of the vehicle and vehicle speed data of the vehicle; the three-axis acceleration data include the left and right acceleration, the front and rear acceleration, and the up and down acceleration of the vehicle;

When the three-axis acceleration at the current moment satisfies one of the following conditions:

|x|>1.5±0.25m/s 2 ;

|y|>3.0±0.25m/s 2 ;

|z|>0.3±0.05m/s 2 ;

|y′|>2.0±0.25m/s 3 ;

Among them, x is the left and right acceleration, y is the front and rear acceleration, z is the up and down acceleration, and y' is the rate of change of the front and rear acceleration;

Record the state at the current time as an emergency state, and record the vehicle state after the time corresponding to the emergency state; if the vehicle stops completely within 15 to 30 seconds, mark the corresponding time of the emergency state and the driving data for 30 seconds before and after it as important data, save it.
The method according to claim 1, wherein the three-axis acceleration data of the built-in IMU of the vehicle is obtained by analyzing the chassis.
The method according to claim 2, wherein the driving recorder of the vehicle is connected to the black box on the canbus, communicates with the chassis, and analyzes the three-axis acceleration data of the built-in IMU of the vehicle from the chassis.
The method according to claim 1, wherein, when the speed of the vehicle is less than 1 km/h, the vehicle is considered to be completely stopped.
The method according to any one of claims 1-4, wherein the important data is stored in a driving recorder or a black box, and will not be overwritten by a cycle.
A driving recorder accident data storage device, characterized in that it includes:

a data receiving module for obtaining three-axis acceleration data of the vehicle and vehicle speed data of the vehicle; the three-axis acceleration data includes the left and right acceleration, the front and rear acceleration, and the up and down acceleration of the vehicle;

A data calculation module, connected with the data receiving module, is used to calculate the rate of change of the front and rear acceleration of the vehicle, and to calculate that the three-axis acceleration at the current moment satisfies one of the following conditions, and if it is satisfied, the state at the current moment is marked as an emergency state :

|x|>1.5±0.25m/s 2 ;

|y|>3.0±0.25m/s 2 ;

|z|>0.3±0.05m/s 2 ;

|y′|>2.0±0.25m/s 3 ;

Among them, x is the left and right acceleration, y is the front and rear acceleration, z is the up and down acceleration, and y' is the rate of change of the front and rear acceleration;

The data storage module is connected to the data calculation module, and is used to record the vehicle state after the emergency state corresponds to the time when the data calculation module marks the emergency state. If the vehicle stops completely within 15 to 30 seconds, the emergency state will be The time corresponding to the state and the driving data before and after 30 seconds are marked as important data and saved.
The device according to claim 6, wherein the data receiving module comprises a driving recorder and a black box; the driving recorder and the black box are connected to the canbus and communicate with the vehicle chassis.
The device according to claim 7, wherein the data receiving module analyzes and obtains the three-axis acceleration data of the built-in IMU of the vehicle from the chassis.
The device according to claim 6, characterized in that, when the speed of the vehicle is less than 1 km/h, the vehicle is considered to be completely stopped.
The device according to any one of claims 6 to 9, wherein the important data stored in the data storage module will not be overwritten cyclically.