CN110696835B - Automatic early warning method and automatic early warning system for dangerous driving behaviors of vehicle - Google Patents

Automatic early warning method and automatic early warning system for dangerous driving behaviors of vehicle Download PDF

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CN110696835B
CN110696835B CN201910963943.7A CN201910963943A CN110696835B CN 110696835 B CN110696835 B CN 110696835B CN 201910963943 A CN201910963943 A CN 201910963943A CN 110696835 B CN110696835 B CN 110696835B
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early warning
dangerous driving
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CN110696835A (en
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向怀坤
曾松
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Shenzhen Polytechnic
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
    • B60W40/08—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models related to drivers or passengers
    • B60W40/09—Driving style or behaviour
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
    • B60W50/08—Interaction between the driver and the control system
    • B60W50/14—Means for informing the driver, warning the driver or prompting a driver intervention
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
    • G06N3/00—Computing arrangements based on biological models
    • G06N3/02—Neural networks
    • G06N3/04—Architecture, e.g. interconnection topology
    • G06N3/045—Combinations of networks
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
    • G06N3/00—Computing arrangements based on biological models
    • G06N3/02—Neural networks
    • G06N3/08—Learning methods

Abstract

The invention provides an automatic early warning method and an automatic early warning system for dangerous driving behaviors of a vehicle, wherein the automatic early warning method comprises the following steps: constructing an automatic discrimination cloud model of dangerous driving behaviors of the vehicle; based on the automatic discrimination cloud model, constructing an automatic prediction cloud model-Elman neural network for the dangerous driving behavior of the vehicle; collecting and storing vehicle motion attitude data in real time; training the automatic prediction cloud model-Elman neural network by using the measured data to obtain an automatic early warning cloud model-Elman neural network meeting the precision requirement; and carrying out automatic early warning based on an automatic early warning cloud model-Elman neural network. The invention can accurately, quickly and reliably analyze and prejudge the dangerous driving behaviors of the vehicle, realizes the active early warning of the dangerous driving behaviors of the vehicle and effectively reduces road traffic accidents.

Description

Automatic early warning method and automatic early warning system for dangerous driving behaviors of vehicle
Technical Field
The invention relates to the field of vehicle safety management, in particular to an automatic early warning method for dangerous driving behaviors of a vehicle and an automatic early warning system for realizing the automatic early warning method for the dangerous driving behaviors of the vehicle.
Background
The dangerous driving behavior of the vehicle is a main factor causing road traffic accidents, and how to quickly, accurately and reliably predict the dangerous driving behavior is one of the difficult problems in the research of the field of vehicle safety management. The dangerous driving behaviors of the vehicle mainly refer to the characteristics of states affecting lane safety keeping stability, vehicle relative distance control safety, vehicle speed/direction control stability and the like, and can be generally divided into two categories, namely longitudinal dangerous driving behaviors and transverse dangerous driving behaviors, wherein typical dangerous driving behaviors comprise that the vehicle is too close to the following vehicle, overspeed, rapid acceleration, rapid deceleration, rapid turning, frequent lane changing and illegal overtaking.
In the conventional research on dangerous driving behaviors, the driving behavior characteristics of a driver are mostly developed, or the dangerous motion state of a vehicle is judged by directly utilizing vehicle-mounted sensor data, so that the subjective feeling and judgment of vehicle safety conditions by vehicle-mounted passengers are rarely considered.
For the analysis of dangerous driving behaviors, research on classification of driving styles of drivers and identification methods thereof is mainly focused. The classification of the driving style of the driver can be generally divided into two major categories, a statistical-based method and a machine learning-based method. Constantinescu et al utilize vehicle-mounted GPS data to perform modeling analysis on a driver driving style, and Hong et al utilize a sensor platform composed of a vehicle-mounted android smart phone, an OBD and an IMU to collect driving behavior parameters; the identification of dangerous driving behaviors is mainly realized by detecting driving events related to safety, such as sudden acceleration, sudden braking, sudden turning and the like, and the dangerous driving behaviors are identified by simultaneously collecting driver monitoring data and vehicle posture data and data mining. The research methods can be generally divided into two major categories, namely template matching based methods and threshold based discrimination methods. Chen, Fan, and Tien et al propose to use driving habit Diagrams (DHG) to simulate driving behavior, Chen et al convert dangerous driving events into an Attributive Relationship Map (ARM) of danger in their research, and then use a two-way fuzzy attribute mapping matching technique; HAN and the like collect speed, acceleration and yaw velocity data by using a vehicle black box, and identify 4 dangerous driving states of the vehicle, such as rapid acceleration, rapid deceleration, rapid turning and sudden lane change; JOHNSON et al studied the recognition threshold for aggressive dangerous driving behavior and found that the steering threshold for aggressive driving was 0.73g and the emergency steering threshold was 0.74 g.
As can be seen from the above review and analysis of the documents, in the process of studying the vehicle motion state and the dangerous driving behavior, the vehicle-mounted sensor unit (such as a GPS, an accelerometer, and the like) is basically used for collecting the vehicle motion state data, but there is no unified and mature method for processing the data and detecting the vehicle motion state. For the research on the dangerous driving behaviors of vehicles, at present, more emphasis is placed on drivers and the operation level of the drivers on the vehicles, and the research method mainly adopts a mathematical statistics method, a specific event template matching method and a machine learning method. Because drivers have very complicated influence factors, the individuation characteristics of the drivers are difficult to express, the privacy problem of people is involved when the drivers are directly monitored, and some monitoring devices can also interfere with the normal driving behaviors of the drivers, so that the management of the safe driving of the vehicles by directly monitoring the drivers is always in greater dispute and is also difficult in practical application. Due to different devices and different data acquisition frequencies, the output vehicle motion state data has strong randomness and dynamic ambiguity characteristics.
In fact, whether the vehicle is safely driven or not finally shows the motion state of the vehicle no matter how complicated the vehicle is influenced by during driving and no matter what driving behavior the driver takes during driving of the vehicle. In other words, the motion state of the vehicle necessarily reflects a certain driving behavior of the driver, and a dangerous vehicle driving state necessarily corresponds to a dangerous driving behavior. Based on the analysis, the invention adopts a research scheme of prejudging dangerous driving behaviors of the vehicle based on real-time monitoring vehicle motion state data.
The difficulty of automatic judgment of dangerous driving behaviors of vehicles and automatic prediction of dangerous driving behaviors of vehicles based on real-time monitored vehicle motion state data is as follows: on one hand, the driver has very complicated influence factors, so that the individuation characteristic of the driver is difficult to accurately express quantitatively, and on the other hand, the output vehicle motion state data has strong randomness and dynamic ambiguity characteristics due to different devices and different data acquisition frequencies. How to relate the vehicle motion state data with high uncertainty change with dangerous driving behaviors to construct a conversion model between quantitative data based on the vehicle motion state and a complex qualitative concept of dangerous driving behaviors, and designing a prediction algorithm of the dangerous driving behaviors based on the vehicle motion state by using the model is a difficult problem in the cross research field at present.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an automatic early warning method and an automatic early warning system for dangerous driving behaviors of a vehicle.
The automatic early warning method for the dangerous driving behaviors of the vehicle comprises the following steps of:
s1: constructing an automatic discrimination cloud model of dangerous driving behaviors of the vehicle;
s2: based on the automatic discrimination cloud model, constructing an automatic prediction cloud model-Elman neural network for the dangerous driving behavior of the vehicle;
s3: collecting and storing vehicle motion attitude data in real time;
s4: training the automatic prediction cloud model-Elman neural network by using the measured data to obtain an automatic early warning cloud model-Elman neural network meeting the precision requirement;
s5: based on an automatic early warning cloud model-Elman neural network, the dangerous driving behavior of the vehicle is automatically early warned by utilizing the measured data.
The invention further improves, after step S3 is executed, the method further includes the vehicle motion attitude data processing step: preprocessing the acquired original data to remove noise in the data, and then repairing the removed data, wherein in the steps of S4 and S5, the actually measured data are data obtained by processing the vehicle motion attitude data.
The invention is further improved, in step S1, the automatic discrimination cloud model refers to a discrimination index of a corresponding relationship between a total weighted acceleration root mean square value and human subjective feeling, and an expert score and passenger feeling to construct an automatic discrimination index of dangerous driving behavior of the vehicle, which is issued by international standards organization and issued by mechanical vibration and impact evaluation standards of human body exposed to whole body vibration and detection standards of smooth driving of automobiles in China, and then extracts a cloud model digital characteristic parameter corresponding to each discrimination index based on experimental observation data by using a reverse cloud transformation algorithm of the cloud model, and the automatic discrimination cloud model is obtained through multiple experiments.
The invention is further improved, and the construction method of the discrimination index of the corresponding relation between the total weighted acceleration root mean square value and the subjective feeling of people comprises the following steps:
s101: for the vibration signal, a discrete fourier transform is adopted to convert the vibration signal into a frequency domain, and the conversion formula is as follows:
Figure BDA0002229866940000031
wherein, x (N) is a finite vibration signal with length N in time domain, and x (f) is a vibration signal in frequency domain;
s102: calculating the root mean square value of one third octave and the weight acceleration of the center of one third octave, wherein the calculation formula of the root mean square value of one third octave is as follows:
Figure BDA0002229866940000032
wherein, aiIs the root mean square value of one third octave and has the unit of m/s2，fiuIs the upper cut-off frequency of the ith frequency band, filIs the lower cut-off frequency of the ith band, df represents the differential of the frequency f,
Figure BDA0002229866940000033
is to find a definite integral, the definite integral interval is fil,fiu]，
Because the human body has different responses to different vibration frequencies in different directions, a weighting factor is given to the center of the frequency to make real measurement data and react to the feeling of the human body, a table is looked up on a center frequency table of one third octave corresponding to the weighting factor, and the acceleration of each axis is calculated through a formula (3), wherein the calculation formula is as follows:
Figure BDA0002229866940000034
wherein, awjIs the weighted acceleration of the vibration signal of each axis, the unit of which is m/s2，j＝x，y，z，kiIs the weighting coefficient of the ith one-third octave band;
s103: and setting the weight value of the acceleration of each axis, weighting the total acceleration of each axis, and calculating the root mean square value of the total acceleration.
The invention further improves that in step S2, the method for constructing the automatic prediction cloud model-Elman neural network includes: the method comprises the steps of using an automatic discrimination cloud model as a target output vector of an Elman neural network, achieving mapping between a cloud model evaluation result and an output value of an MEMS sensor, wherein the Elman neural network comprises an input layer, an output layer and a hidden layer, the input layer, the output layer and the hidden layer are respectively provided with a plurality of neurons, training the Elman neural network, and sampling, identifying and outputting through adjustment of weights of all layers to enable a root mean square value error to be minimum.
The invention is further improved, and the vehicle motion attitude data comprises six-degree-of-freedom motion attitude data and vehicle motion speed parameters.
The invention also provides an automatic early warning system for realizing the automatic early warning method of the dangerous driving behaviors of the vehicle, which comprises the following steps:
a first building block: the automatic judgment cloud model is used for constructing the dangerous driving behavior of the vehicle;
a second building block: an automatic prediction cloud model-Elman neural network for constructing dangerous driving behaviors of the vehicle based on the automatic discrimination cloud model;
a data acquisition module: the system is used for acquiring vehicle motion attitude data in real time;
a data storage module: for storing data;
a training module: the system comprises a cloud model-Elman neural network, a cloud model-to-model and a cloud model-to-neural network;
an automatic early warning module: the real-time early warning method is used for carrying out real-time automatic early warning on dangerous driving behaviors of the vehicle by utilizing the measured data based on an automatic early warning cloud model-Elman neural network.
The invention is further improved, and the invention also comprises a vehicle motion attitude data processing module: the method is used for preprocessing the acquired original data to remove noise in the data and then repairing the removed data.
Compared with the prior art, the invention has the beneficial effects that: the method can accurately, quickly and reliably analyze and prejudge the dangerous driving behaviors of the vehicle, realizes active early warning of the dangerous driving behaviors of the vehicle, and effectively reduces road traffic accidents.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a flow chart of a method for building an automatic discrimination cloud model;
FIG. 3 is a flow chart of a cloud model-Elman neural network construction method for automatically predicting dangerous driving behaviors of a vehicle;
FIG. 4 is a schematic diagram of a hardware composition structure of the intelligent vehicle-mounted terminal.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The invention discloses a cloud model-Elman neural network-based automatic early warning method for dangerous driving behaviors, which is designed by introducing a cloud model theory to combine vehicle driving posture data with subjective feelings of passengers and aiming at the safety supervision requirements of future unmanned vehicles.
As shown in FIG. 1, the invention designs a vehicle motion state data acquisition and processing system, and realizes real-time acquisition and processing of vehicle six-degree-of-freedom motion attitude data, vehicle motion speed and other parameters. And secondly, establishing a vehicle dangerous driving behavior automatic distinguishing cloud model corresponding to the vehicle motion state by combining the international standard and the domestic standard of the vehicle motion perception of the passengers and expert knowledge. And finally, designing an automatic prediction algorithm of the dangerous driving behavior of the vehicle based on a cloud model-Elman neural network, and taking the automatic judgment cloud model of the dangerous driving behavior of the vehicle as a target output vector of the Elman neural network, thereby carrying out real-time automatic early warning on the dangerous driving behavior of the vehicle. The respective steps are explained in detail below.
The method comprises the following steps: automatic judgment cloud model for dangerous driving behaviors of vehicle
Referring to the evaluation standards of mechanical vibration and impact of human body exposed to whole body vibration and the detection standards of automobile smoothness in China, which are published by the international standard organization, the invention relates to a judgment index of the corresponding relation between the total weighted acceleration root mean square value (RMS) and the subjective feeling of human, and an automatic judgment index of dangerous driving behaviors of vehicles, which is established by the scoring of experts and the feeling of passengers, then extracts the digital characteristic parameters of a cloud model corresponding to each judgment index based on experimental observation data by using the cloud transformation algorithm of the cloud model, and obtains a set of automatic judgment cloud models of dangerous driving behaviors of vehicles through a plurality of experiments.
Specifically, the method for constructing the discrimination index of the corresponding relationship between the root mean square value of the total weighted acceleration and the subjective feeling of the person comprises the following steps:
s101: for the vibration signal (triaxial acceleration), a discrete fourier transform is adopted to convert the vibration signal into a frequency domain, and the conversion formula is as follows:
Figure BDA0002229866940000051
wherein, x (N) is a finite vibration signal with length N in time domain, and x (f) is a vibration signal in frequency domain;
s102: calculating a root mean square value (RMS) of a third octave and a weight acceleration of a center of the third octave, the
The one-third octave root mean square value calculation formula is as follows:
Figure BDA0002229866940000052
wherein, aiIs the root mean square value of one third octave and has the unit of m/s2，fiuIs the upper cut-off frequency of the ith frequency band, filIs the lower cut-off frequency of the ith band, df represents the differential of the frequency f,
Figure BDA0002229866940000053
is to find a definite integral, the definite integral interval is fil,fiu]，
Since the human body reacts differently to different vibration frequencies in different directions, real measurement data can be made if a weighting factor is given to the center of the frequency, thereby reacting to the feeling of the human body. ISO2631-1 (1997)/Amd 1:2010 gives a table of the center frequency of the third octave corresponding to the weighting factor for each axis. Thus, the acceleration of each axis is calculated by looking up the table and by equation (3) as:
Figure BDA0002229866940000054
wherein, awjIs the weighted acceleration of the vibration signal of each axis, the unit of which is m/s2，j＝x，y，z，kiIs the weighting coefficient of the ith one-third octave band;
s103: and setting the weight value of the acceleration of each axis, weighting the total acceleration of each axis, and calculating the root mean square value of the total acceleration. In this example, the weight of the x-axis and the y-axis is 1.4, the weight of the z-axis is 1.0, and the root mean square value of the total acceleration is calculated as:
Figure BDA0002229866940000061
wherein, awIs the root mean square value of the total acceleration in m/s2And a is awx、awy、awzIs the root mean square value of each axis in equation (3).
The inverse cloud transformation algorithm adopted by the automatic discrimination cloud model digital feature calculation of the embodiment is as follows:
inputting: n cloud drops xi(i＝1，2，...，n)；
And (3) outputting: numerical feature estimate (expectation)
Figure BDA0002229866940000062
Entropy of the entropy
Figure BDA0002229866940000063
And entropy
Figure BDA0002229866940000064
)。
Step 1:
Figure BDA0002229866940000065
calculating an arithmetic mean value, and taking the arithmetic mean value as an estimated value of the expected parameter of the cloud model;
and 2, step 2: randomly sampled packets
For(i＝1，i≤m，i++)
For(j＝1，j≤r，j++)
Randomly sampling n cloud drop xi (i ═ 1, 2.., n) samples
END For
Xi＝{Xi1，Xi2，...Xir}，
Figure BDA0002229866940000066
Figure BDA0002229866940000067
END For
Figure BDA0002229866940000068
Figure BDA0002229866940000069
And 3, step 3:
Figure BDA00022298669400000610
the step 2 and the step 3 are entropy of the cloud model calculated by computer software programming
Figure BDA00022298669400000611
And entropy
Figure BDA00022298669400000612
In which two loops are involved, wherein m, j, r have the meaning only in this program generationThe code module is effective, and respectively represents the random sampling grouping number of cloud droplet samples, and is a variable set by a program when the program is used for calculation in the module.
Step two: method for constructing automatic prediction cloud model-Elman neural network of dangerous driving behaviors of vehicle
The construction process is shown in fig. 3, the automatic judgment cloud model of the dangerous driving behaviors of the vehicle is used as a target output vector of the Elman neural network, the mapping between the cloud model evaluation result and the output value of the MEMS (micro electro mechanical system) sensor is realized, and the automatic early warning of the dangerous driving behaviors is completed. The input layer of the Elman neural network is set to be 6 neurons, the output layer is set to be 1 neuron, and the number of the selected hidden layer neurons is 13. The network is trained by adopting a gradient descent method, and sampling output and recognition output can be performed by adjusting the weight of each layer of network, so that the Mean Square Error (MSE) is minimum.
The nonlinear space state expression of the automatic prediction cloud model-Elman neural network is as follows:
Figure BDA0002229866940000071
xc(k)＝x(k-1) (6)
Figure BDA0002229866940000072
wherein u (k-1) represents the network input, y (k) represents the network output, x (k) represents the hidden layer output,
Figure BDA0002229866940000073
and f and g respectively represent transfer functions of the hidden layer and the output layer.
Thirdly, collecting the vehicle motion attitude data in real time and storing the data
And opening a vehicle motion state data acquisition and processing system, acquiring vehicle motion attitude data in real time, and storing the data. As shown in fig. 4, the system mainly includes a vehicle-mounted GPS, Micro-Electro-Mechanical Systems (MEMS) sensors, a CAN bus, a camera, and the like, and the MEMS sensors include a three-axis acceleration sensor and a three-axis angle sensor, so as to realize real-time acquisition and processing of parameters such as vehicle six-degree-of-freedom motion attitude data and vehicle motion speed.
Fourthly, vehicle motion attitude data processing
The method comprises the steps of utilizing Kalman filtering to preprocess original data to remove noise (error data) in the data, and utilizing a quadratic exponential smoothing method to repair the removed data.
And fifthly, training the cloud model-Elman neural network by utilizing the measured data to obtain the automatic early warning cloud model-Elman neural network for the dangerous driving behavior of the vehicle, which meets the precision requirement.
And sixthly, based on an automatic early warning cloud model-Elman neural network, real-time automatic early warning is carried out on dangerous driving behaviors of the vehicle by utilizing the measured data.
The invention can accurately, quickly and reliably analyze and prejudge the dangerous driving behaviors of the vehicle. Research reports on NHTSA (1998) show that dangerous driving behavior is a major cause of road traffic safety problems. Expert scholars from different countries found that 93-94% of road traffic accidents are caused by human factors, 8-12% by vehicle factors, and 28-34% by road factors [1] (Edu Ardo AVascon cells, 1996). The dangerous driving behaviors of the vehicle directly reflect the operation problems of a vehicle driver, if the dangerous driving behaviors of the vehicle can be found in time, the driver can be reminded and warned in time, and the vehicle can be forcibly taken over even by the vehicle-mounted safety management and control device at a critical moment, so that traffic accidents can be effectively prevented. Taking a bus and a taxi as an example, if a driver frequently implements dangerous driving behaviors such as rapid acceleration, rapid deceleration or rapid turning in the driving process, the traffic order is easily disturbed, traffic accidents are caused, passengers feel uncomfortable, and the fear psychology is generated.
The above-described embodiments are intended to be illustrative, and not restrictive, of the invention, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (8)

1. An automatic early warning method for dangerous driving behaviors of a vehicle is characterized by comprising the following steps:
s1: constructing an automatic discrimination cloud model of dangerous driving behaviors of the vehicle;
s2: based on the automatic discrimination cloud model, constructing an automatic prediction cloud model-Elman neural network for the dangerous driving behavior of the vehicle;
s3: collecting and storing vehicle motion attitude data in real time;
s4: training the automatic prediction cloud model-Elman neural network by using the measured data to obtain an automatic early warning cloud model-Elman neural network meeting the precision requirement;
s5: based on an automatic early warning cloud model-Elman neural network, real-time automatic early warning is carried out on dangerous driving behaviors of the vehicle by utilizing measured data,
the reverse cloud transformation algorithm adopted by the automatic discrimination cloud model digital feature calculation is as follows:
inputting:
Figure DEST_PATH_IMAGE001
chinese medicine drop
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；
And (3) outputting: numerical feature estimate (expectation)
Figure DEST_PATH_IMAGE003
Entropy of
Figure 314431DEST_PATH_IMAGE004
And entropy
Figure DEST_PATH_IMAGE005
），
Step 1:
Figure 37493DEST_PATH_IMAGE006
(ii) a Calculating an arithmetic mean value, and taking the arithmetic mean value as an estimated value of the expected parameter of the cloud model;
and 2, step 2: randomly sampled packets
Figure 240941DEST_PATH_IMAGE008
Figure DEST_PATH_IMAGE009
To pair
Figure 489651DEST_PATH_IMAGE001
Chinese medicine drop
Figure 887397DEST_PATH_IMAGE002
Randomly sampling the sample
Figure 962669DEST_PATH_IMAGE010
Figure DEST_PATH_IMAGE011
Figure 595907DEST_PATH_IMAGE012
Figure 574489DEST_PATH_IMAGE010
Figure DEST_PATH_IMAGE013
Figure DEST_PATH_IMAGE015
And 3, step 3:
Figure 205453DEST_PATH_IMAGE016
the step 2 and the step 3 are entropy of the cloud model calculated by computer software programming
Figure DEST_PATH_IMAGE018A
And entropy
Figure DEST_PATH_IMAGE020A
The meaning of m, j, r is only valid in the program code module, respectively represents the random sampling grouping number of cloud droplet samples, and is a variable set by the program in the module for calculation, EY2Is Y2Desired value of (DY)2Is Y2The variance of (c).
2. The automatic early warning method for dangerous driving behavior of a vehicle according to claim 1, characterized in that: after step S3 is executed, the method further includes the vehicle motion attitude data processing step: preprocessing the collected original vehicle motion attitude data to remove noise in the data, then repairing the removed data,
in steps S4 and S5, the measured data is processed data of the vehicle motion posture data.
3. The automatic early warning method for dangerous driving behavior of a vehicle according to claim 1 or 2, characterized in that: in step S1, the automatic discrimination cloud model refers to a discrimination index of a correspondence between a root mean square value of total weighted acceleration and subjective feeling of a human in mechanical vibration and impact evaluation standards of human body exposure to whole body vibration and national automobile ride comfort driving detection standards published by the international standard organization, and an automatic discrimination index of dangerous driving behavior of a vehicle constructed by expert scoring and passenger feeling, and then extracts cloud model digital characteristic parameters corresponding to each discrimination index based on experimental observation data by using an inverse cloud transform algorithm of the cloud model, and is obtained through multiple experiments.
4. The automatic early warning method for dangerous driving behavior of a vehicle according to claim 3, characterized in that: the construction method of the discrimination index of the corresponding relation between the total weighted acceleration root mean square value and the subjective feeling of people comprises the following steps:
s101: for the vibration signal, a discrete fourier transform is adopted to convert the vibration signal into a frequency domain, and the conversion formula is as follows:
Figure DEST_PATH_IMAGE022A
（1）
wherein the content of the first and second substances,
Figure DEST_PATH_IMAGE024AA
for a finite vibration signal of length N in the time domain,
Figure DEST_PATH_IMAGE026A
is a vibration signal in the frequency domain;
s102: calculating the root mean square value of one third octave and the weight acceleration of the center of one third octave
The one-third octave root mean square value calculation formula is as follows:
Figure DEST_PATH_IMAGE028AA
Figure DEST_PATH_IMAGE030A
（2）
wherein the content of the first and second substances,
Figure DEST_PATH_IMAGE032AA
is the root mean square value of one third of octave and has the unit of
Figure DEST_PATH_IMAGE034AA
，
Figure DEST_PATH_IMAGE036AA
Is the upper cut-off frequency of the ith frequency band,
Figure DEST_PATH_IMAGE038AA
is the lower cut-off frequency of the ith band,
Figure DEST_PATH_IMAGE040AA
representing frequency
Figure DEST_PATH_IMAGE042AA
The amount of the differential of (a) is,
Figure DEST_PATH_IMAGE044AAAA
is to find a definite integral, the definite integral interval is [ 2 ]
Figure DEST_PATH_IMAGE046AA
]，
Because the human body has different responses to different vibration frequencies in different directions, a weighting factor is given to the center of the frequency to make real measurement data and react to the feeling of the human body, a table is looked up on a center frequency table of one third octave corresponding to the weighting factor, and the acceleration of each axis is calculated through a formula (3), wherein the calculation formula is as follows:
Figure DEST_PATH_IMAGE048AAAA
（3）
wherein the content of the first and second substances,
Figure DEST_PATH_IMAGE050AAAA
is the weighted acceleration of the vibration signal of each axis in units of
Figure DEST_PATH_IMAGE034AAA
，
Figure DEST_PATH_IMAGE052AAAA
，
Figure DEST_PATH_IMAGE054AA
Is the weighting coefficient of the ith one-third octave band;
s103: and setting the weight value of the acceleration of each axis, weighting the total acceleration of each axis, and calculating the root mean square value of the total acceleration.
5. The automatic early warning method for dangerous driving behavior of a vehicle according to claim 1 or 2, characterized in that: in step S2, the method for constructing the automatic prediction cloud model-Elman neural network includes: the method comprises the steps of using an automatic discrimination cloud model as a target output vector of an Elman neural network, achieving mapping between a cloud model evaluation result and an output value of an MEMS sensor, wherein the Elman neural network comprises an input layer, an output layer and a hidden layer, the input layer, the output layer and the hidden layer are respectively provided with a plurality of neurons, training the Elman neural network, and sampling, identifying and outputting through adjustment of weights of all layers to enable a root mean square value error to be minimum.
6. The automatic early warning method for dangerous driving behavior of a vehicle according to claim 1 or 2, characterized in that: the vehicle motion attitude data comprises six-degree-of-freedom motion attitude data and vehicle motion speed parameters.
7. An automatic early warning system for implementing an automatic early warning method of a dangerous driving behavior of a vehicle according to any one of claims 1 to 6, comprising:
a first building block: the automatic judgment cloud model is used for constructing the dangerous driving behavior of the vehicle;
a second building block: an automatic prediction cloud model-Elman neural network for constructing dangerous driving behaviors of the vehicle based on the automatic discrimination cloud model;
a data acquisition module: the system is used for acquiring vehicle motion attitude data in real time;
a data storage module: for storing data;
a training module: the system comprises a cloud model-Elman neural network, a cloud model-to-model and a cloud model-to-neural network;
an automatic early warning module: the method is used for carrying out automatic early warning on dangerous driving behaviors of the vehicle by utilizing the measured data based on an automatic early warning cloud model-Elman neural network.
8. The automatic early warning system of claim 7, wherein: the device also comprises a data processing module: the method is used for preprocessing the vehicle motion attitude data to remove noise in the data and then repairing the removed data.
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