CN114750764B - Online intelligent monitoring and early warning management system for new energy automobile driving safety - Google Patents

Online intelligent monitoring and early warning management system for new energy automobile driving safety Download PDF

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CN114750764B
CN114750764B CN202210540105.0A CN202210540105A CN114750764B CN 114750764 B CN114750764 B CN 114750764B CN 202210540105 A CN202210540105 A CN 202210540105A CN 114750764 B CN114750764 B CN 114750764B
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tire
new energy
road surface
energy automobile
running
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CN114750764A (en
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杨振
张宇
李洪彬
祁正国
笪久江
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JIANGHUI COLLEGE OF ANHUI UNIVERSITY
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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
    • B60W40/02—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 ambient conditions
    • B60W40/06—Road conditions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/02—Signalling devices actuated by tyre pressure
    • B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/02—Signalling devices actuated by tyre pressure
    • B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
    • B60C23/0486—Signalling devices actuated by tyre pressure mounted on the wheel or tyre comprising additional sensors in the wheel or tyre mounted monitoring device, e.g. movement sensors, microphones or earth magnetic field sensors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/02—Signalling devices actuated by tyre pressure
    • B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
    • B60C23/0486—Signalling devices actuated by tyre pressure mounted on the wheel or tyre comprising additional sensors in the wheel or tyre mounted monitoring device, e.g. movement sensors, microphones or earth magnetic field sensors
    • B60C23/0488—Movement sensor, e.g. for sensing angular speed, acceleration or centripetal force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/12—Recording operating variables ; Monitoring of operating variables
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • 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
    • 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
    • B60W2050/143—Alarm means

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  • Automation & Control Theory (AREA)
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Abstract

The invention discloses an online intelligent monitoring and early warning management system for the running safety of a new energy automobile, which comprises a safety monitoring equipment setting module, a bumpy road surface judging and identifying module, a new energy automobile running safety monitoring module, a supervision database and an early warning management terminal.

Description

Online intelligent monitoring and early warning management system for new energy automobile driving safety
Technical Field
The invention relates to the technical field of automobile driving monitoring, in particular to an online intelligent monitoring and early warning management system for driving safety of a new energy automobile.
Background
In recent years, with the rapid development of economy in China and the gradual improvement of living standard of people, automobiles are used as main transportation tools, the popularization number of the automobiles is very large, and thus, the large consumption of traditional fuels such as petroleum and the serious damage to ecological environment are caused. Under the circumstances, people are focusing on the development and research of new energy, and compared with the traditional automobile, the new energy automobile has obvious advantages in all aspects and becomes the main direction of the development of the automobile in the future.
In view of the particularity of a power source of the new energy automobile, once bumping and colliding happen in the driving process, potential safety hazards of batteries are easily caused, and personal safety of drivers and passengers is seriously harmed.
However, most of the current driving safety monitoring of the new energy automobile on a bumpy road surface focuses on a power battery, the monitoring mode is more apparent and is not deep enough, and the influence of the driving state of the automobile body and the running state of a tire on the driving safety is ignored.
Disclosure of Invention
In order to overcome the defects, the invention builds the online intelligent monitoring and early warning management system for the running safety of the new energy automobile, and the running safety of the new energy automobile on a bumpy road surface is monitored from three aspects of the automobile body, the power battery and the tires of the new energy automobile, so that the technical problems in the background art are fully solved.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a new energy automobile safety on-line intelligent monitoring early warning management system that traveles, includes:
the safety monitoring device setting module is used for setting safety monitoring devices in the new energy automobile;
the system comprises a bumpy road surface judging and identifying module, a new energy automobile tire center position and a bumpy road surface judging and identifying module, wherein the bumpy road surface judging and identifying module is used for arranging an infrared distance meter at the center position of the new energy automobile tire and is used for judging and identifying the bumpy road surface of the current running road surface of the new energy automobile in real time;
the new energy automobile driving safety monitoring module is used for monitoring the driving safety of the new energy automobile when the current driving road surface of the new energy automobile is recognized to be a bumpy road surface, and comprises an automobile body driving state monitoring unit, a power battery state monitoring unit and a tire running state monitoring unit;
the monitoring database is used for storing jounce degree ranges corresponding to various jounce grades, storing adaptive running speeds corresponding to various jounce grades, storing allowable rotating speed differences of symmetrical tires corresponding to various running speed adaptation degrees, storing a vibration frequency change curve of a power battery installation area in a stable state and storing adaptive tire pressures corresponding to various jounce grades;
and the early warning management terminal is used for carrying out intelligent early warning prompt based on the running safety monitoring result of the new energy automobile.
As a further improvement of the technical scheme, the safety monitoring device comprises a vibration sensor, a discharge detector, a temperature sensor, a tire pressure monitoring sensor, a speed sensor and a wheel speed sensor, wherein the vibration sensor, the discharge detector and the temperature sensor are all arranged in a power battery installation area of the new energy automobile, the tire pressure monitoring sensor and the wheel speed sensor are all arranged in a tire of the new energy automobile, and the speed sensor is arranged in the new energy automobile.
As a further improvement of the above technical solution, the determining and identifying the bumpy road surface on the current driving road surface of the new energy vehicle specifically includes:
setting a reference ground, measuring the distance between the set position of the infrared distance meter and the reference ground according to the set detection time interval by using the infrared distance meter arranged on the new energy automobile tire, and recording the distance as the ground clearance, thereby obtaining the ground clearance corresponding to each detection time;
comparing the ground clearance corresponding to each detection moment with each other, and screening out the maximum ground clearance and the minimum ground clearance;
according to the screened maximum ground clearance and minimum ground clearanceCalculating the degree of jolt of the current driving road surface to obtain the degree of jolt corresponding to the current driving road surface, wherein the calculation formula is
Figure BDA0003647826180000031
PE is expressed as the corresponding degree of jounce, L, of the current driving road surface max 、L min Respectively expressed as maximum ground clearance and minimum ground clearance,
Figure BDA0003647826180000032
expressed as the average ground clearance;
and comparing the corresponding degree of jolt of the current driving road with a set degree of jolt threshold value, and if the corresponding degree of jolt of the current driving road is greater than the set degree of jolt threshold value, identifying the current driving road as the jolt road.
As a further improvement of the above technical solution, the method for obtaining the average ground clearance is to perform an average processing on the ground clearances corresponding to the respective detection times to obtain the average ground clearance.
As a further improvement of the above technical solution, the vehicle body driving state monitoring unit is configured to monitor a vehicle body driving state of the new energy vehicle through a speed sensor and a wheel speed sensor, and a specific monitoring process is as follows:
acquiring the running speed of the new energy automobile through a speed sensor according to a set detection time interval to obtain the running speed corresponding to each detection moment;
analyzing the allowable rotating speed difference of the symmetrical tires corresponding to each detection time based on the running speed corresponding to each detection time;
respectively recording tires on a new energy automobile as a tire A, a tire B, a tire C and a tire D, wherein the tire A and the tire B are left-side tires, the tire C and the tire D are right-side tires, the tire A and the tire C are in a symmetric relation, and the tire B and the tire D are in a symmetric relation;
respectively detecting the rotating speed of each tire on the new energy automobile according to a set detection time interval through a wheel speed sensor to obtain the rotating speed corresponding to each tire at each detection moment;
acquiring a driving steering angle corresponding to each tire at each detection moment;
based on the rotating speed and the driving steering angle corresponding to each tire at each detection moment, the driving stability index of the vehicle body corresponding to each detection moment is counted, and the calculation formula is
Figure BDA0003647826180000041
BR t The vehicle body running stability index corresponding to the t-th detection time is expressed, t is the number of the detection time, and t =1,2 t A 、V t C 、V t B 、V t D The rotation speeds, Δ V, corresponding to the tires A, B, C and D at the t-th detection time t Expressed as the allowable rotation speed difference of the symmetrical tire corresponding to the t-th detection time, theta t A 、θ t B 、θ t C 、θ t D Respectively representing the driving steering angles corresponding to the tire A, the tire B, the tire C and the tire D at the tth detection time;
and extracting a minimum vehicle body running stability index from the vehicle body running stability indexes corresponding to all the detection moments to serve as running state monitoring data corresponding to the vehicle body of the new energy vehicle under the current running road surface.
As a further improvement of the above technical solution, the operation of analyzing the allowable rotation speed difference of the symmetrical tire corresponding to each detection time based on the running speed corresponding to each detection time comprises the following steps:
matching the degree of jolt corresponding to the current driving road surface with the degree of jolt ranges corresponding to various levels of jolt stored in the supervision database, thereby obtaining the level of jolt corresponding to the current driving road surface;
the bumping grade corresponding to the current driving road surface is compared with the new energy automobile adaptive driving speed corresponding to various bumping grades stored in the supervision database, and the new energy automobile adaptive driving speed corresponding to the current driving road surface is screened out;
comparing the running speed corresponding to each detection moment with the adaptive running speed of the new energy automobile corresponding to the current running road surface, and evaluating the adaptive degree of the running speed corresponding to each detection moment;
and matching the running speed adaptation degree corresponding to each detection moment with the preset symmetrical tire allowable rotating speed difference corresponding to each running speed adaptation degree, thereby obtaining the symmetrical tire allowable rotating speed difference corresponding to each detection moment.
As a further improvement of the above technical solution, the power battery state monitoring unit is used for performing safety monitoring on the installation state and the operation state of the power battery in the new energy automobile through the vibration sensor, the discharge detector and the temperature sensor, and the specific monitoring process is as follows:
carrying out vibration frequency detection on the power battery installation area through a vibration sensor according to a set detection time interval to obtain vibration frequencies corresponding to all detection moments;
drawing a vibration frequency change curve of a power battery installation area under the current running road surface by taking the detection time as an abscissa and the vibration frequency as an ordinate;
the vibration frequency change curve of the power battery installation area under the current driving road surface is superposed and compared with the vibration frequency change curve of the power battery installation area under the stable state stored in the supervision database, the length of the superposition curve is further obtained, the installation stability index corresponding to the power battery under the current driving road surface is calculated, and the installation stability index is used as the installation state monitoring data corresponding to the power battery under the current driving road surface, wherein the installation stability index calculation formula is
Figure BDA0003647826180000061
The method comprises the following steps that SI is expressed as an installation stability index corresponding to a power battery under a current running road surface, X is expressed as a coincidence curve length, and X is expressed as a vibration frequency change curve length of a power battery installation area in a stable state;
detecting the discharge current of the power battery through a discharge detector according to a set detection time interval to obtain the discharge current corresponding to each detection moment;
selecting the maximum discharge current from the discharge currents corresponding to the detection moments, further acquiring the detection moment corresponding to the maximum discharge current, and recording the detection moment as a key detection moment;
detecting the environmental temperature of the installation area of the power battery through a temperature sensor according to a set detection time interval to obtain the environmental temperature corresponding to each detection time, and screening out the environmental temperature corresponding to the key detection time based on the key detection time;
introducing the maximum discharge current and the environment temperature corresponding to the key detection time into a discharge danger index calculation formula to obtain a discharge danger index corresponding to the power battery under the current driving road surface, and taking the discharge danger index as operation state monitoring data corresponding to the power battery under the current driving road surface, wherein the discharge danger index calculation formula is
Figure BDA0003647826180000071
DI is expressed as the discharge danger index, I, corresponding to the power battery under the current driving road surface max Expressed as the maximum discharge current, I, corresponding to the time of the key detection 0 The discharge current of the power battery in a normal operation state is represented, T is the environmental temperature corresponding to the important detection moment, and T 0 The temperature of the environment of the power battery in a normal operation state is expressed, and e is expressed as a natural constant.
As a further improvement of the above technical solution, the tire running state monitoring unit is used for performing safety monitoring on the running state of each tire on the new energy vehicle, and the specific monitoring process is as follows:
respectively detecting the tire pressures of the tires on the new energy automobile according to a set detection time interval by using a tire pressure monitoring sensor to obtain the tire pressures of the tires at each detection moment, and extracting the maximum tire pressure and the minimum tire pressure corresponding to each tire from the tire pressures;
comparing the bumping grade corresponding to the current driving road surface with the adaptive tire pressures corresponding to various bumping grades stored in the supervision database, and screening out the adaptive tire pressure corresponding to the current driving road surface;
comparing the maximum tire pressure and the minimum tire pressure corresponding to each tire with the adaptive tire pressure corresponding to the current driving road surface, and countingThe running risk index corresponding to each tire on the front running road surface is recorded as running state monitoring data corresponding to each tire on the current running road surface, wherein the running risk index calculation formula is
Figure BDA0003647826180000072
TP I Expressed as the running risk index corresponding to the ith tire under the current driving surface, I is expressed as the tire number, wherein I = a or B or C or D, P I max、P I min is respectively expressed as the maximum tire pressure and the minimum tire pressure corresponding to the I-th tire, p 0 The adaptive tire pressure corresponding to the current driving road surface is expressed, alpha and beta are respectively expressed as weight factors corresponding to tire pressure stability and tire pressure adaptability, and alpha + beta =1.
As a further improvement of the above technical solution, the specific execution method for performing intelligent early warning based on the driving safety monitoring result of the new energy vehicle includes:
and respectively comparing the running state monitoring data corresponding to the new energy automobile body under the current running road surface, the installation state monitoring data corresponding to the power battery, the running state monitoring data corresponding to the power battery and the running state monitoring data corresponding to each tire with the set warning reference monitoring data, and carrying out corresponding early warning prompt according to the comparison result.
By combining all the technical schemes, the invention has the advantages and positive effects that:
according to the invention, by judging and identifying the bumpy road surface of the new energy automobile on the current running road surface, and respectively monitoring the running state safety of the automobile body, the running state safety of the power battery and the running state safety of the tire from three aspects of the automobile body, the power battery and the tire when the current running road surface is recognized to be the bumpy road surface, the safety monitoring of the new energy automobile on the bumpy road surface in multiple aspects is realized, the defect that the running safety monitoring of the new energy automobile on the bumpy road surface in the prior art is too expressive and not deep enough is overcome, the running safety monitoring depth of the new energy automobile on the bumpy road surface is greatly improved, the running safety hidden danger can be timely found through the monitoring, the accident occurrence rate is further reduced, and the personal safety of drivers and passengers can be favorably ensured in real time.
According to the invention, the driving condition of the new energy automobile on the bumpy road is safely monitored in many aspects, and different early warning prompts can be carried out according to the monitoring result, so that a driver can know potential safety hazards existing in the driving process of the new energy automobile on the bumpy road in time, and further, a targeted processing measure is provided for the subsequent processing of the driver, and the processing efficiency is improved to a certain extent.
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The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
FIG. 1 is a schematic diagram of the system module connection of the present invention;
fig. 2 is a schematic connection diagram of the new energy vehicle driving safety monitoring module according to the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Fig. 1 shows a schematic diagram of module connection corresponding to an online intelligent monitoring and early warning management system for the driving safety of a new energy automobile, and the system comprises a safety monitoring device setting module, a bumpy road surface judging and identifying module, a new energy automobile driving safety monitoring module, a supervision database and an early warning management terminal.
The safety monitoring device setting module and the bumpy road surface judging and identifying module in the modules are connected with the new energy automobile running safety monitoring module, and the new energy automobile running safety monitoring module is connected with the supervision database and the early warning management terminal respectively.
Safety monitoring equipment sets up the module and is used for setting up safety monitoring equipment in new energy automobile, safety monitoring equipment includes vibration sensor, the detector that discharges, temperature sensor, tire pressure monitoring sensor, speed sensor and fast sensor of wheel, and wherein vibration sensor, the detector that discharges and temperature sensor all set up the power battery installation region at new energy automobile, and tire pressure monitoring sensor and fast sensor of wheel all embed in new energy automobile tire, and speed sensor sets up in new energy automobile.
In a further technical scheme, the safety monitoring equipment is set to provide monitoring guarantee for subsequent running safety monitoring of the new energy automobile.
The bumpy road surface judging and identifying module is used for arranging an infrared distance meter at the center of a new energy automobile tire and is used for judging and identifying the bumpy road surface of the current driving road surface of the new energy automobile in real time, and the specific identifying method comprises the following steps:
setting a reference ground, measuring the distance between the set position of the infrared distance meter and the reference ground according to the set detection time interval by using the infrared distance meter arranged on the new energy automobile tire, and recording the distance as the ground clearance, thereby obtaining the ground clearance corresponding to each detection time;
it should be noted that, the reference ground mentioned in the present invention may be a ground corresponding to the driving road surface at the first detection time, and the purpose of the reference ground setting is to provide a fixed reference horizontal plane for the ground clearance;
comparing the ground clearance corresponding to each detection moment with each other, and screening out the maximum ground clearance and the minimum ground clearance;
calculating the degree of jounce of the current driving road surface according to the screened maximum ground clearance and the screened minimum ground clearance to obtain the degree of jounce corresponding to the current driving road surface, wherein the calculation formula is
Figure BDA0003647826180000101
PE is expressed as the corresponding degree of jounce, L, of the current driving road surface max 、L min Expressed as maximum ground clearance, respectivelyThe distance from the ground is small, and the ground is smooth,
Figure BDA0003647826180000102
the method specifically comprises the steps of carrying out average processing on ground clearance corresponding to each detection moment to obtain average ground clearance, wherein the larger the difference between the maximum ground clearance and the minimum ground clearance is, the larger the bumping degree is;
and comparing the corresponding degree of jolt of the current driving road with a set degree of jolt threshold value, and if the corresponding degree of jolt of the current driving road is greater than the set degree of jolt threshold value, identifying the current driving road as the jolt road.
The new energy automobile driving safety monitoring module is used for monitoring the driving safety of the new energy automobile when the new energy automobile is identified to be a bumpy road surface, and as shown in the figure 2, the new energy automobile driving safety monitoring module comprises an automobile body driving state monitoring unit, a power battery state monitoring unit and a tire running state monitoring unit.
The vehicle body running state monitoring unit is used for monitoring the vehicle body running state of the new energy vehicle through the speed sensor and the wheel speed sensor, and the specific monitoring process is as follows:
acquiring the running speed of the new energy automobile through a speed sensor according to a set detection time interval to obtain the running speed corresponding to each detection moment;
analyzing the allowable rotating speed difference of the symmetrical tires corresponding to each detection time based on the running speed corresponding to each detection time, wherein the analyzing operation steps are as follows:
the first step is as follows: matching the degree of jolt corresponding to the current driving road surface with the degree of jolt ranges corresponding to various levels of jolt stored in the supervision database, thereby obtaining the level of jolt corresponding to the current driving road surface;
the second step: the bumping grade corresponding to the current driving road surface is compared with the new energy automobile adaptive driving speed corresponding to various bumping grades stored in the supervision database, and the new energy automobile adaptive driving speed corresponding to the current driving road surface is screened out;
the third step: comparing the running speed corresponding to each detection moment with the adaptive running speed of the new energy automobile corresponding to the current running road surface, and evaluating the adaptive degree of the running speed corresponding to each detection moment, wherein the evaluation formula is
Figure BDA0003647826180000121
The running speed at each detection moment is closer to the adaptive running speed of the new energy automobile, and the running speed adaptation degree is higher;
the fourth step: matching the running speed adaptation degree corresponding to each detection moment with the allowable rotation speed difference of the symmetrical tires corresponding to the preset various running speed adaptation degrees, thereby obtaining the allowable rotation speed difference of the symmetrical tires corresponding to each detection moment;
respectively recording tires on the new energy automobile as a tire A, a tire B, a tire C and a tire D, wherein the tire A and the tire B are left-side tires, the tire C and the tire D are right-side tires, the tire A and the tire C are in a symmetric relation, and the tire B and the tire D are in a symmetric relation;
respectively detecting the rotating speed of each tire of the new energy automobile according to a set detection time interval through a wheel speed sensor to obtain the rotating speed corresponding to each tire at each detection moment;
acquiring a driving steering angle corresponding to each tire at each detection moment;
based on the rotating speed and the driving steering angle corresponding to each tire at each detection moment, the vehicle body driving stability index corresponding to each detection moment is counted, and the calculation formula is
Figure BDA0003647826180000122
BR t Is expressed as a vehicle body running stability index corresponding to the t-th detection time, t is expressed as the number of the detection time, and t =1,2 t A 、V t C 、V t B 、V t D The rotation speeds, Δ V, corresponding to the tires A, B, C and D at the t-th detection time t Expressed as the allowable rotation speed difference of the symmetrical tire corresponding to the t-th detection time, theta t A 、θ t B 、θ t C 、θ t D Respectively representing the driving steering angles corresponding to the tire A, the tire B, the tire C and the tire D at the tth detection time;
in a further technical scheme, the larger the difference of the rotating speeds between the symmetrical tires is, the larger the difference of the driving steering angles is, the more easily the vehicle body is in an unbalanced state, and the worse the driving stability of the vehicle body is;
it should be noted that, in the calculation formula of the vehicle body driving stability index, because the steering angle of the automobile tire is limited, generally between 30 degrees and 40 degrees, the absolute value of the steering angle difference between the symmetric tires is in the angle range corresponding to the first quadrant, and the cosine function is a decreasing function in the first quadrant, which just meets the calculation requirement;
and extracting a minimum vehicle body running stability index from the vehicle body running stability indexes corresponding to all the detection moments to serve as running state monitoring data corresponding to the vehicle body of the new energy vehicle under the current running road surface.
The power battery state monitoring unit is used for carrying out safety monitoring on the installation state and the running state of the power battery in the new energy automobile through the vibration sensor, the discharge detector and the temperature sensor, and the specific monitoring process is as follows:
carrying out vibration frequency detection on the power battery installation area through a vibration sensor according to a set detection time interval to obtain vibration frequencies corresponding to all detection moments;
drawing a vibration frequency change curve of the power battery installation area under the current driving road surface by taking the detection time as an abscissa and the vibration frequency as an ordinate;
the vibration frequency change curve of the power battery installation area under the current driving road surface is superposed and compared with the vibration frequency change curve of the power battery installation area under the stable state stored in the supervision database, the length of the superposition curve is further obtained, the installation stability index corresponding to the power battery under the current driving road surface is calculated, and the installation stability index is used as the installation state monitoring data corresponding to the power battery under the current driving road surface, wherein the installation stability index calculation formula is
Figure BDA0003647826180000131
The method comprises the following steps that SI is expressed as an installation stability index corresponding to a power battery under a current running road surface, X is expressed as a coincidence curve length, and X is expressed as a vibration frequency change curve length of a power battery installation area in a stable state;
detecting the discharge current of the power battery through a discharge detector according to a set detection time interval to obtain the discharge current corresponding to each detection moment;
selecting the maximum discharge current from the discharge currents corresponding to the detection moments, further acquiring the detection moment corresponding to the maximum discharge current, and recording the detection moment as a key detection moment;
detecting the environment temperature of the installation area of the power battery through a temperature sensor according to a set detection time interval to obtain the environment temperature corresponding to each detection moment, and screening out the environment temperature corresponding to the key detection moment based on the key detection moment;
introducing the maximum discharge current and the environment temperature corresponding to the key detection time into a discharge danger index calculation formula to obtain a discharge danger index corresponding to the power battery under the current driving road surface, and taking the discharge danger index as operation state monitoring data corresponding to the power battery under the current driving road surface, wherein the discharge danger index calculation formula is
Figure BDA0003647826180000141
DI is expressed as the discharge risk index, I, corresponding to the power battery under the current driving road surface max Expressed as the maximum discharge current, I, corresponding to the time of the key detection 0 The discharge current of the power battery in a normal operation state is represented, T is the environmental temperature corresponding to the important detection moment, and T 0 The temperature of the environment of the power battery in a normal operation state is expressed, and e is expressed as a natural constant.
In the above discharge risk index calculation formula, the greater the difference between the maximum discharge current and the discharge current of the power battery in the normal operation state, the greater the difference between the ambient temperature and the ambient temperature of the power battery in the normal operation state, the greater the discharge risk index, and the higher the discharge risk degree.
In one embodiment, the invention integrates the effects of two factors, namely discharge current and ambient temperature, on the discharge danger in the process of monitoring the discharge danger of the power battery, because when the discharge current is too large, the ambient temperature is higher, and the possibility of fire is higher.
Preferably, in the process of safety monitoring of the power battery, the power battery is monitored from two dimensions of an installation state and an operation state respectively, so that the comprehensive state monitoring of the power battery is realized, the one-sidedness existing in single-dimensional monitoring is avoided, and the accuracy and reliability of the monitoring result are improved.
The tire running state monitoring unit is used for carrying out safety monitoring on the running state of each tire on the new energy automobile, and the specific monitoring process is as follows:
respectively detecting the tire pressures of the tires on the new energy automobile according to a set detection time interval by using a tire pressure monitoring sensor to obtain the tire pressures of the tires at each detection moment, and extracting the maximum tire pressure and the minimum tire pressure corresponding to each tire from the tire pressures;
comparing the bumping grade corresponding to the current driving road surface with the adaptive tire pressures corresponding to various bumping grades stored in the supervision database, and screening out the adaptive tire pressure corresponding to the current driving road surface;
comparing the maximum tire pressure and the minimum tire pressure corresponding to each tire with the adaptive tire pressure corresponding to the current driving road surface, counting the running risk index corresponding to each tire under the current driving road surface, and recording the running risk index as the running state monitoring data corresponding to each tire under the current driving road surface, wherein the running risk index calculation formula is
Figure BDA0003647826180000151
TP I Expressed as the running risk index corresponding to the I-th tire under the current running surface, I is expressed as the tire number, wherein I = A or B or C or D, P I max、P I min is respectively expressed as the maximum tire pressure corresponding to the I-th tire,Minimum tire pressure, p 0 Expressed as the adaptive tire pressure corresponding to the current driving road surface, α, β are expressed as weight factors corresponding to tire pressure stability, tire pressure adaptability, respectively, and α + β =1.
According to the embodiment of the invention, by judging and identifying the bumpy road surface of the current running road surface of the new energy automobile, and respectively monitoring the running state of the automobile body, the running state of the power battery and the running state of the tire from three starting points of the automobile body, the power battery and the tire when the current running road surface is recognized to be the bumpy road surface, the safety monitoring of the new energy automobile on the bumpy road surface in various aspects is realized, the defect that the running safety monitoring of the new energy automobile on the bumpy road surface in the prior art is too over-represented and not deep enough is overcome, the depth of the running safety monitoring of the new energy automobile on the bumpy road surface is greatly improved, the running safety hidden danger can be timely found through the monitoring, the accident occurrence rate is reduced, and the personal safety of drivers and passengers is favorably ensured in real time.
The supervision database is used for storing flatness ranges corresponding to various flatness grades, storing adaptive running speeds corresponding to various flatness grades, storing allowable rotating speed differences of symmetrical tires corresponding to various running speed adaptation degrees, storing vibration frequency change curves of a power battery installation area in a stable state, and storing adaptive tire pressures corresponding to various flatness grades.
The early warning management terminal is used for carrying out intelligent early warning prompt based on a driving safety monitoring result of the new energy automobile, and the specific execution method comprises the following steps:
comparing running state monitoring data corresponding to a new energy automobile body under a current running road surface, installation state monitoring data corresponding to a power battery, running state monitoring data corresponding to the power battery and running state monitoring data corresponding to each tire with set warning reference monitoring data respectively, wherein the warning reference monitoring data comprise an automobile body running stability index warning value, an installation stability index warning value, a discharging danger index warning value and a running danger index warning value;
if the running stability index corresponding to the new energy automobile body under the current running road surface is smaller than the automobile body running stability index warning value, carrying out early warning prompt on the running state of the automobile body;
if the installation stability index corresponding to the new energy automobile power battery under the current running road surface is smaller than the installation stability index warning value, early warning prompt of the installation state of the power battery is carried out;
if the discharging danger index corresponding to the new energy automobile power battery under the current running road surface is larger than the set discharging danger index warning value, early warning prompt of the running state of the power battery is carried out;
and if the running danger index corresponding to a certain tire of the new energy automobile under the current running road surface is larger than the set running danger index warning value, carrying out early warning prompt on the running state of the tire, and simultaneously carrying out voice broadcast on the serial number of the tire.
According to the embodiment of the invention, the driving condition of the new energy automobile on the bumpy road surface is safely monitored in multiple aspects, and different early warning prompts can be carried out according to the monitoring result, so that a driver can conveniently know the potential safety hazard of the new energy automobile in the process of driving on the bumpy road surface in time, and further, a targeted processing measure is provided for the subsequent processing of the driver, and the processing efficiency is improved to a certain extent.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the invention as defined in the following claims.

Claims (8)

1. The utility model provides a new energy automobile safety on-line intelligent monitoring early warning management system that traveles which characterized in that includes:
the safety monitoring device setting module is used for setting safety monitoring devices in the new energy automobile;
the system comprises a bumpy road surface judging and identifying module, a new energy automobile tire center position and a bumpy road surface judging and identifying module, wherein the bumpy road surface judging and identifying module is used for arranging an infrared distance meter at the center position of the new energy automobile tire and is used for judging and identifying the bumpy road surface of the current running road surface of the new energy automobile in real time;
the new energy automobile driving safety monitoring module is used for monitoring the driving safety of the new energy automobile when the current driving road surface of the new energy automobile is recognized as a bumpy road surface, and comprises an automobile body driving state monitoring unit, a power battery state monitoring unit and a tire running state monitoring unit;
the monitoring database is used for storing jounce degree ranges corresponding to various jounce grades, storing adaptive running speeds corresponding to the various jounce grades, storing the allowable rotating speed difference of symmetrical tires corresponding to the various running speed adaptation degrees, storing a vibration frequency change curve of a power battery installation area in a stable state and storing adaptive tire pressures corresponding to the various jounce grades;
the early warning management terminal is used for carrying out intelligent early warning prompt based on the running safety monitoring result of the new energy automobile;
the vehicle body running state monitoring unit is used for monitoring the vehicle body running state of the new energy vehicle through the speed sensor and the wheel speed sensor, and the specific monitoring process is as follows:
acquiring the running speed of the new energy automobile through a speed sensor according to a set detection time interval to obtain the running speed corresponding to each detection moment;
analyzing the allowable rotating speed difference of the symmetrical tires corresponding to each detection time based on the running speed corresponding to each detection time;
respectively recording tires on a new energy automobile as a tire A, a tire B, a tire C and a tire D, wherein the tire A and the tire B are left-side tires, the tire C and the tire D are right-side tires, the tire A and the tire C are in a symmetric relation, and the tire B and the tire D are in a symmetric relation;
respectively detecting the rotating speed of each tire of the new energy automobile according to a set detection time interval through a wheel speed sensor to obtain the rotating speed corresponding to each tire at each detection moment;
acquiring a driving steering angle corresponding to each tire at each detection moment;
counting the running stability of the vehicle body corresponding to each detection moment based on the rotating speed and the running steering angle corresponding to each tire at each detection momentDetermining an index, which is calculated by the formula
Figure FDA0003834223080000021
BR t Is expressed as a vehicle body running stability index corresponding to the t-th detection time, t is expressed as the number of the detection time, and t =1,2 t A 、V t C 、V t B 、V t D The rotation speeds Δ V of the tires A, B, C and D at the t-th detection time t Expressed as the allowable rotation speed difference, theta, of the symmetrical tire corresponding to the t-th detection time t A 、θ t B 、θ t C 、θ t D Respectively representing the driving steering angles corresponding to the tire A, the tire B, the tire C and the tire D at the tth detection time;
and extracting a minimum vehicle body running stability index from the vehicle body running stability indexes corresponding to all the detection moments to serve as running state monitoring data corresponding to the vehicle body of the new energy vehicle under the current running road surface.
2. The new energy automobile driving safety online intelligent monitoring and early warning management system as claimed in claim 1, characterized in that: the safety monitoring equipment comprises a vibration sensor, a discharge detector, a temperature sensor, a tire pressure monitoring sensor, a speed sensor and a wheel speed sensor, wherein the vibration sensor, the discharge detector and the temperature sensor are all arranged in a power battery installation area of the new energy automobile, the tire pressure monitoring sensor and the wheel speed sensor are all arranged in a tire of the new energy automobile, and the speed sensor is arranged in the new energy automobile.
3. The new energy automobile driving safety online intelligent monitoring and early warning management system as claimed in claim 1, characterized in that: the method for judging and identifying the bumpy road surface on the current driving road surface of the new energy automobile specifically comprises the following steps:
setting a reference ground, measuring the distance between the set position of the infrared distance meter and the reference ground according to the set detection time interval by using the infrared distance meter arranged on the new energy automobile tire, and recording the distance as the ground clearance, thereby obtaining the ground clearance corresponding to each detection time;
comparing the ground clearance corresponding to each detection moment with each other, and screening out the maximum ground clearance and the minimum ground clearance;
calculating the degree of jounce of the current driving road surface according to the screened maximum ground clearance and the screened minimum ground clearance to obtain the degree of jounce corresponding to the current driving road surface, wherein the calculation formula is
Figure FDA0003834223080000031
PE is expressed as the corresponding degree of jounce, L, of the current driving road surface max 、L min Respectively expressed as maximum ground clearance and minimum ground clearance,
Figure FDA0003834223080000032
expressed as the average ground clearance;
and comparing the corresponding degree of jolt of the current driving road with a set degree of jolt threshold value, and if the corresponding degree of jolt of the current driving road is greater than the set degree of jolt threshold value, identifying the current driving road as the jolt road.
4. The new energy automobile driving safety online intelligent monitoring and early warning management system according to claim 3, characterized in that: the method for obtaining the average ground clearance is to perform average processing on the ground clearances corresponding to the detection moments to obtain the average ground clearance.
5. The new energy automobile driving safety online intelligent monitoring and early warning management system as claimed in claim 1, characterized in that: the operation of analyzing the allowable rotating speed difference of the symmetrical tires corresponding to each detection time based on the running speed corresponding to each detection time comprises the following specific steps:
matching the degree of jolt corresponding to the current driving road surface with the degree of jolt ranges corresponding to various levels of jolt stored in the supervision database, thereby obtaining the level of jolt corresponding to the current driving road surface;
the bumping grade corresponding to the current driving road surface is compared with the new energy automobile adaptive driving speed corresponding to various bumping grades stored in the supervision database, and the new energy automobile adaptive driving speed corresponding to the current driving road surface is screened out;
comparing the running speed corresponding to each detection moment with the adaptive running speed of the new energy automobile corresponding to the current running road surface, and evaluating the adaptive degree of the running speed corresponding to each detection moment;
and matching the running speed adaptation degree corresponding to each detection moment with the preset symmetrical tire allowable rotating speed difference corresponding to each running speed adaptation degree, thereby obtaining the symmetrical tire allowable rotating speed difference corresponding to each detection moment.
6. The new energy automobile driving safety online intelligent monitoring and early warning management system as claimed in claim 1, characterized in that: the power battery state monitoring unit is used for carrying out safety monitoring on the installation state and the running state of the power battery in the new energy automobile through the vibration sensor, the discharge detector and the temperature sensor, and the specific monitoring process is as follows:
detecting the vibration frequency of the power battery installation area through a vibration sensor according to a set detection time interval to obtain the vibration frequency corresponding to each detection moment;
drawing a vibration frequency change curve of the power battery installation area under the current driving road surface by taking the detection time as an abscissa and the vibration frequency as an ordinate;
the vibration frequency change curve of the power battery installation area under the current driving road surface is superposed and compared with the vibration frequency change curve of the power battery installation area under the stable state, which is stored in a supervision database, so as to obtain the length of the superposition curve, thereby calculating the installation stability index corresponding to the power battery under the current driving road surface, and taking the installation stability index as the installation state monitoring data corresponding to the power battery under the current driving road surface, wherein the installation stability index calculation formula is
Figure FDA0003834223080000051
The method comprises the following steps that SI is expressed as an installation stability index corresponding to a power battery under a current running road surface, X is expressed as a coincidence curve length, and X is expressed as a vibration frequency change curve length of a power battery installation area in a stable state;
detecting the discharge current of the power battery through a discharge detector according to a set detection time interval to obtain the discharge current corresponding to each detection moment;
selecting the maximum discharge current from the discharge currents corresponding to the detection moments, further acquiring the detection moment corresponding to the maximum discharge current, and recording the detection moment as a key detection moment;
detecting the environment temperature of the installation area of the power battery through a temperature sensor according to a set detection time interval to obtain the environment temperature corresponding to each detection moment, and screening out the environment temperature corresponding to the key detection moment based on the key detection moment;
introducing the maximum discharge current and the environment temperature corresponding to the key detection time into a discharge danger index calculation formula to obtain a discharge danger index corresponding to the power battery under the current driving road surface, and taking the discharge danger index as operation state monitoring data corresponding to the power battery under the current driving road surface, wherein the discharge danger index calculation formula is
Figure FDA0003834223080000052
DI is expressed as the discharge risk index, I, corresponding to the power battery under the current driving road surface max Expressed as the maximum discharge current, I, corresponding to the time of the key detection 0 The discharge current of the power battery in a normal operation state is represented, T is the environmental temperature corresponding to the important detection moment, and T 0 The temperature of the environment of the power battery in a normal operation state is expressed, and e is expressed as a natural constant.
7. The new energy automobile driving safety online intelligent monitoring and early warning management system as claimed in claim 1, characterized in that: the tire running state monitoring unit is used for carrying out safety monitoring on the running state of each tire of the new energy automobile, and the specific monitoring process is as follows:
respectively detecting the tire pressure of each tire of the new energy automobile according to a set detection time interval by using a tire pressure monitoring sensor to obtain the tire pressure of each tire at each detection moment, and extracting the maximum tire pressure and the minimum tire pressure corresponding to each tire from the tire pressure;
comparing the bumping grade corresponding to the current driving road surface with the adaptive tire pressures corresponding to various bumping grades stored in the supervision database, and screening out the adaptive tire pressure corresponding to the current driving road surface;
comparing the maximum tire pressure and the minimum tire pressure corresponding to each tire with the adaptive tire pressure corresponding to the current driving road surface, counting the running risk index corresponding to each tire under the current driving road surface, and recording the running risk index as the running state monitoring data corresponding to each tire under the current driving road surface, wherein the running risk index calculation formula is
Figure FDA0003834223080000061
TP I Expressed as the running risk index corresponding to the I-th tire under the current running surface, I is expressed as the tire number, wherein I = A or B or C or D, P I max、P I min is respectively expressed as the maximum tire pressure and the minimum tire pressure, p, corresponding to the I-th tire 0 The adaptive tire pressure corresponding to the current driving road surface is expressed, alpha and beta are respectively expressed as weight factors corresponding to tire pressure stability and tire pressure adaptability, and alpha + beta =1.
8. The new energy automobile driving safety online intelligent monitoring and early warning management system as claimed in claim 1, characterized in that: the specific execution method for carrying out intelligent early warning on the basis of the driving safety monitoring result of the new energy automobile comprises the following steps:
and respectively comparing the running state monitoring data corresponding to the new energy automobile body under the current running road surface, the installation state monitoring data corresponding to the power battery, the running state monitoring data corresponding to the power battery and the running state monitoring data corresponding to each tire with the set warning reference monitoring data, and carrying out corresponding early warning prompt according to the comparison result.
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