A method and system for controlling vehicle braking

Abstract

The application discloses a kind of automobile brake control method and system, it is related to brake control technical field, step one, the basic information of automobile is collected, and it is preset in brake control system according to the friction coefficient of road section that automobile is obtained on the road surface of driving road;Step two, obtain the information of automobile navigation driving route in internet, and obtain the reference road surface information where automobile travels;Step three, according to the brake reference data of automobile, provide automobile safety limit data to client;Step four, collect automobile driving route and carry out regularity analysis;Step five, obtain the situation of brake abnormality in the process of automobile driving.The application can be corresponding to the change of maximum speed threshold value under different road surface and road surface with water, has relatively accurate reference, has good guarantee effect to driving safety, reaches high-risk section and makes brake response preparation or brake deceleration, can improve stability and safety in the process of driving.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of brake control, in particular to a vehicle brake control method and system. BACKGROUND

[0002] In vehicle driving, vehicle safety is the most important research focus, and the vehicle brake system refers to a series of special devices that apply a certain force to some parts of the vehicle to forcibly brake them to a certain extent. With the development of society, the development process of autonomous vehicles is also particularly rapid. Among them, autonomous vehicles have more targeted needs in braking.

[0003] The prior art has the following disadvantages: it is difficult to limit the maximum speed of the curve driving according to the characteristics of the curve and the friction of the vehicle driving in the process of the vehicle driving on the curve, which is easy to cause the vehicle to drift and lead to dangerous accidents due to judgment problems. In addition, when driving on familiar road sections, the driver cannot understand the driver's braking habits, and thus cannot provide a dangerous prompt to the driver under the same road conditions, and cannot improve the braking safety. SUMMARY

[0004] The purpose of the present application is to provide a vehicle brake control method and system to solve the problems in the background art.

[0005] In order to achieve the above purpose, the present application provides the following technical scheme: a vehicle brake control method, comprising the following steps:

[0006] Step one, collect the basic information of the vehicle, and pre-set the friction coefficient of the vehicle on the road section according to the road surface of the driving road in the brake control system, and then obtain the brake reference data;

[0007] Step two, obtain the vehicle navigation driving route information in the Internet, and obtain the reference road surface information of the vehicle driving, and correspondingly obtain the friction coefficient combined with the wear degree of the tire, and then form the actual vehicle driving data;

[0008] Step three, provide vehicle safety limit data to the client according to the brake reference data of the vehicle;

[0009] Step four, collect the vehicle driving route for regularity analysis, and then form the frequently driven path, and mark the driving characteristics of the frequently driven path;

[0010] Step five, obtain the brake abnormality in the process of vehicle driving, analyze the brake abnormality, form the brake habit index, and then prompt the driving section according to the brake habit index.

[0011] In a preferred embodiment, the process of obtaining the braking reference data is as follows:

[0012] Obtaining the basic information of the car, including the car weight, torque, gear ratio, final gear ratio, mechanical efficiency and tire radius;

[0013] Obtaining the car friction coefficient through the basic information of the car, and the obtaining method is as follows:

[0014] Corresponding to different road information, the friction coefficient of the car and the road is obtained, and the same road information is managed as a type of road;

[0015] According to the driving of different types of roads, the basic information of the car during uniform driving is obtained, and then the friction coefficient on the road section is obtained, and the calculation formula of the friction coefficient is as follows:

[0016]

[0017] Wherein, μ m is the friction coefficient, T is the torque, i b is the gear ratio, i z is the final gear ratio, P x is the mechanical efficiency, R is the tire radius and G is the car weight;

[0018] The friction coefficient corresponding to different construction types of road is transmitted and stored in the braking control system as braking reference data;

[0019] At the same time, according to the same construction type and the road with water, the corresponding friction coefficient is obtained again, and is transmitted and stored in the braking control system as braking reference data;

[0020] The original tire is aimed at different roads and roads with water as reference road state;

[0021] At the same time, according to the wear degree of the tire, the corresponding friction coefficient is obtained, and the obtaining method is as follows:

[0022] In the safe service life of the tire, the wear degree of the tire is divided into three levels, namely first level wear, second level wear and third level wear, and the wear degree of the tire is divided according to the mileage of the tire;

[0023] The three levels of wear degree of the tire corresponding to the reference road state are obtained respectively to obtain the friction coefficient.

[0024] In a preferred embodiment, the actual car driving data is obtained as follows:

[0025] Obtaining the reference road surface information of the current road where the car is running, and according to the wear degree of the tire, the friction coefficient of the current road is obtained, and then the actual car running data is formed.

[0026] In a preferred embodiment, the car safety limit data is set as follows:

[0027] Obtaining braking reference data, collecting the actual car running speed on the route, and then comparing the actual car running speed with the set car running speed, when the actual car running speed exceeds the set car running speed, prompting the driver to drive at a high speed and brake the vehicle to reduce speed;

[0028] Obtaining the internet navigation route and collecting information on the location of the internet route curve, obtaining the turning arc length of the pipe and the central angle, and then obtaining the radius of the curve arc length through the formula Where L is the turning arc length, and a is the central angle; and then the centripetal force of the curve driving is obtained through the radius of the curve arc length, and the formula is: Where,

[0029] In addition, the friction force F c = μ * G, then when F c ≥ F c , the car can keep normal driving;

[0030] When F c <F c , the car cannot keep normal driving, and the maximum speed of the curve driving is limited as a threshold limit, and when the maximum speed of the curve driving is exceeded, slow braking is performed to below the speed threshold limit, and the client can select whether to use the speed threshold limit.

[0031] In a preferred embodiment, the driving feature marking method is as follows:

[0032] Obtaining the car navigation driving route information in the internet, and recording the route according to the navigation driving route information to form a frequent driving path;

[0033] In the frequent driving path, the car driving route is collected according to the road section, and the feature marking is the large change of speed, and the driving feature marking is collected according to the time when driving in the frequent driving path, and the time is divided into time periods for separate management to obtain the time period driving feature marking.

[0034] The time period driving feature marking corresponding to the frequent driving path is stored in the braking control system.

[0035] In a preferred embodiment, the braking habit index is obtained as follows:

[0036] The automobile navigation driving route information in the Internet is acquired, the emergency braking condition in the automobile navigation driving route is collected, the braking condition is combined with the collection of images and the corresponding navigation driving route is stored and analyzed to form braking habit information, and the braking habit information is respectively: environmental emergency braking, self emergency braking and regular braking; the braking habit information is processed to form a braking habit index, and the calculation formula is:

[0037]

[0038] Wherein, φ τ is the braking habit index, n h is the number of environmental emergency braking, and alpha is the environmental emergency braking coefficient; n z is the number of self emergency braking, beta is the self emergency braking coefficient, and n is the total number of braking habit information braking, wherein alpha < beta.

[0039] The application also provides an automobile braking control system, which comprises an automobile information collection unit, a braking safety setting unit, a road information acquisition unit, a braking control system, a familiar road marking unit, a braking state management unit and a client.

[0040] In a preferred embodiment, the automobile information collection unit is used for collecting automobile basic information to form braking reference data.

[0041] The road information acquisition unit is used for collecting road surface data of the automobile driving route to provide reference for road surface information in the automobile driving process.

[0042] The braking safety setting unit is used for obtaining the threshold limit of automobile speed according to the automobile braking reference data.

[0043] The familiar road marking unit is used for marking the driving characteristics of the frequently driven path, and the driving characteristic marking data is stored and updated according to time periods.

[0044] The braking state management unit is used for reflecting the state of the route driven by the automobile at the time according to the braking state of the automobile in the driving process, and analyzing the braking state data in the automobile driving process to form a braking habit index.

[0045] In the above technical solution, the application provides technical effects and advantages:

[0046] 1、The application can limit the safe driving state of the vehicle when turning, avoid the vehicle drift caused by the driving speed exceeding the limited speed, avoid the situation of vehicle drift out of control, and can correspond to the change of the maximum speed threshold of different road surfaces and road surfaces with water, has relatively accurate reference, and has good guarantee effect on driving safety.

[0047] 2、The application can understand the driving state of the driver, and mark the road section according to the braking habit index of the road section. Subsequently, when reaching the road section, driving reminding is performed, high-risk road sections are reached, and braking reaction preparation or braking deceleration is prepared, which can improve the stability and safety in the driving process. BRIEF DESCRIPTION OF DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art based on these drawings.

[0049] Figure 1 The method flowchart of the present application.

[0050] Figure 2 The system block diagram of the present application. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0052] Embodiment 1, please refer to Figure 1 The automobile braking control method described in this embodiment comprises the following steps:

[0053] Step one, collect the basic information of the automobile, and pre-set the friction coefficient of the automobile on the road section according to the road surface (various road surfaces) of the driving road in the braking control system, and then obtain the braking reference data;

[0054] Obtain the basic information of the automobile, which includes the weight of the automobile, the torque, the gear ratio of the gearbox, the final gear ratio, the mechanical efficiency and the tire radius;

[0055] Obtain the automobile friction coefficient through the automobile basic information, and the obtaining method of the automobile friction coefficient is:

[0056] Corresponding different road information respectively obtains the friction coefficient between the car and the road, and the same road information is used as a kind of road management.

[0057] According to the driving of different types of roads, the basic information of the car during uniform speed driving is obtained, and then the friction coefficient on the road section is obtained. The calculation formula of the friction coefficient is:

[0058]

[0059] Among them, μ m is the friction coefficient, T is the torque, i b is the gear ratio of the gearbox, i z is the final gear ratio, P x is the mechanical efficiency, R is the tire radius, and G is the weight of the car.

[0060] The friction coefficient corresponding to different construction types of road (the construction types of road include asphalt pavement, concrete pavement and soil pavement, etc.) is transmitted and stored as braking reference data to the braking control system.

[0061] At the same time, according to the same construction type and the water condition of the road, the corresponding friction coefficient is obtained again, and is transmitted and stored as braking reference data to the braking control system.

[0062] The original tire is aimed at different road conditions and water conditions as the reference road condition.

[0063] At the same time, according to the wear degree of the tire, the corresponding friction coefficient is obtained, and the obtaining method is:

[0064] During the safe service life of the tire, the wear degree of the tire is divided into three levels, namely first-level wear, second-level wear and third-level wear, and the wear degree of the tire is divided according to the mileage of the tire.

[0065] The three levels of wear degree of the tire corresponding to the reference road condition are used to obtain the friction coefficient.

[0066] The automobile information acquisition unit is used to acquire the basic information of the car, and form the braking reference data.

[0067] Step two, obtain the car navigation driving route information in the Internet, and obtain the reference road information of the car driving, and obtain the friction coefficient according to the wear degree of the tire, and then form the actual car driving data.

[0068] The actual car driving data is obtained in the following way:

[0069] Obtain the reference road surface information of the current automobile driving road (obtain the road surface information by visual image technology), and obtain the friction coefficient of the current road according to the wear degree grade of the tire, so as to form the actual automobile driving data;

[0070] The road information acquisition unit is used for collecting data of the road surface of the automobile driving route, and providing reference of the road surface information in the automobile driving process;

[0071] Step three, provide the automobile safety limit data to the client according to the automobile braking reference data;

[0072] Obtain the braking reference data, collect the actual automobile driving speed on the route, and then compare the actual automobile driving speed with the set automobile driving speed, when the actual automobile driving speed exceeds the set automobile driving speed, immediately prompt the driver to drive at high speed, and brake the vehicle to reduce the speed;

[0073] Obtain the internet navigation route and collect information of the position of the curved road of the internet route, obtain the turning arc length of the pipe and the central angle, and then obtain the radius of the curved road arc length through the formula Wherein, L is the turning arc length, and a is the central angle; and then obtain the centripetal force of the curved road driving through the radius of the curved road arc length, and the formula is: Wherein,

[0074] In addition, the friction force F c = μ * G, so when F c ≥ F c , the car can keep normal driving;

[0075] When F c <F c , the car cannot keep normal driving (drifting will occur), and the maximum speed of the curved road driving is limited as the threshold limit, when the maximum speed of the curved road driving is exceeded, slow down to below the speed threshold limit, and whether the speed threshold limit is selected for driving can be selected through the client, if the speed threshold limit is selected for driving, the speed control of the curved road driving can be performed;

[0076] The safety driving state of the vehicle can be limited when turning, the drifting of the vehicle caused by the driving speed exceeding the limited speed is avoided, the situation of the vehicle drifting out of control is avoided, the maximum speed threshold corresponding to different road surfaces and the road surface with water can be changed, the reference is more accurate, and the driving safety is better guaranteed;

[0077] The braking safety setting unit is used for obtaining the threshold limit of the automobile speed according to the automobile braking reference data;

[0078] Step four, collecting the driving route of the car to analyze the regularity, and then forming the frequent driving path, and marking the driving characteristics of the frequent driving path;

[0079] Obtaining the car navigation driving route information in the Internet, and recording the route according to the navigation driving route information to form the frequent driving path;

[0080] In the frequent driving path, the driving route of the car is collected according to the road section, and the characteristic mark is the large amplitude change of the speed. The driving characteristic mark is collected according to the time when driving in the frequent driving path, and the time is divided into time periods for separate management to obtain the time period driving characteristic mark;

[0081] The time period driving characteristic mark corresponding to the frequent driving path is stored in the brake control system;

[0082] The familiar road marking unit is used to mark the driving characteristics of the frequent driving path, and the driving characteristic mark data is stored and updated according to the time period;

[0083] Step five, obtaining the brake abnormal situation in the driving process of the car, and analyzing the brake abnormal situation to form the brake habit index, and then prompting the driving section according to the brake habit index;

[0084] Obtaining the car navigation driving route information in the Internet, collecting the emergency brake situation in the car navigation driving route, and storing and analyzing the brake habit information by combining the brake situation with the image collection and the corresponding navigation driving route. The brake habit information is respectively: environmental emergency brake (normal driving, emergency brake caused by external factors), self emergency brake (emergency brake caused by driving problem) and regular brake (emergency brake when waiting for red and green light); The brake habit information is processed to form the brake habit index, and the calculation formula is:

[0085]

[0086] Among them, φ τ is the brake habit index, n h is the number of environmental emergency brake, α is the environmental emergency brake coefficient, n z is the number of self emergency brake, β is the self emergency brake coefficient, n is the total number of brake habit information, and α<β. It should be noted that the larger the values of n h and n z , the larger the value of φ τ , the stronger the brake habit index, which represents the worse driving habit of the driver, and the brake habit information is marked in the route;

[0087] The driving state of the driver can be understood, and the road section is marked according to the braking habit index of the road section. Subsequently, when the road section is reached, driving reminders are given, and the driver is prepared for braking response or braking deceleration when reaching the high-risk road section, thereby improving the stability and safety during driving.

[0088] The braking state management unit is used to reflect the state of the braking state of the automobile during driving according to the route on which the automobile is currently driving, and analyze the braking state data of the automobile during driving to form a braking habit index.

[0089] Embodiment 2, please refer to Figure 2 As shown, including automobile information acquisition unit, braking safety setting unit, road information acquisition unit, braking control system, familiar road marking unit, braking state management unit and client;

[0090] The automobile information acquisition unit is used to collect the basic information of the automobile to form braking reference data;

[0091] The road information acquisition unit is used to collect data on the road surface of the automobile driving route, and provide reference for road surface information during automobile driving;

[0092] The braking safety setting unit is used to obtain the threshold limit of the automobile speed according to the automobile braking reference data;

[0093] The familiar road marking unit is used to mark the driving characteristics of the frequently driven path, and store and update the driving characteristic marking data according to the time period;

[0094] The braking state management unit is used to reflect the state of the braking state of the automobile during driving according to the route on which the automobile is currently driving, and analyze the braking state data of the automobile during driving to form a braking habit index.

[0095] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for controlling vehicle braking, characterized in that, Includes the following steps: Step 1: Collect basic vehicle information and pre-set the friction coefficient of the vehicle on the road section based on the road surface in the braking control system to obtain braking reference data. Step 2: Obtain the car navigation route information from the Internet, obtain the reference road surface information where the car is driving, and obtain the friction coefficient according to the tire wear level to form the actual car driving data; Step 3: Provide vehicle safety limit data to the client based on the vehicle's braking reference data; The method for setting vehicle safety limit data is as follows: Obtain braking reference data, collect the actual vehicle speed on the route, and then compare the actual vehicle speed with the set vehicle speed. When the actual vehicle speed exceeds the set vehicle speed, immediately remind the driver to drive too fast and brake the vehicle to slow down. The system obtains internet navigation routes and collects information on the locations of curves along these routes. This yields the pipe's turning arc length and the angle of its center point. The radius of the curve is then calculated using a formula. Where L is the turning arc length, Let be the central angle; then, the centripetal force of the vehicle traveling on the curve can be obtained from the radius of the curve's arc length, and its formula is: ,in, ; In addition, friction So in At that time, the car was able to maintain normal operation; exist When the vehicle cannot maintain normal driving, the maximum speed for driving on curves is set as a threshold limit. If the maximum speed for driving on curves is exceeded, the vehicle will be braked slowly until it is below the speed threshold limit. The vehicle can select whether to use the speed threshold limit for driving through the client. Step 4: Collect vehicle driving routes for regularity analysis to form frequent driving paths, and mark the driving characteristics of the frequent driving paths; Step 5: Obtain information on abnormal braking situations that occur during vehicle operation, analyze these abnormal braking situations to generate a braking habit index, and then provide guidance for driving sections based on the braking habit index. The braking habit index is obtained as follows: This process acquires vehicle navigation route information from the internet, collects data on emergency braking along these routes, and stores and analyzes this data, combining the braking patterns with the captured images and corresponding navigation routes, to form braking habit information. This braking habit information is categorized as: sudden environmental braking, sudden self-braking, and regular braking. The braking habit information is then processed to form a braking habit index, calculated using the following formula: ； in, Braking habit index, The number of times the environment suddenly brakes. For sudden environmental braking coefficient, For the number of times it brakes suddenly, For its own sudden braking coefficient, This refers to the total number of braking actions based on braking habits. .

2. The vehicle braking control method according to claim 1, characterized in that: The process for obtaining braking reference data is as follows: Obtain basic vehicle information, including vehicle weight, torque, transmission gear ratios, final gear ratio, mechanical efficiency, and tire radius; The coefficient of friction of a vehicle is obtained by analyzing its basic information. The method for obtaining the coefficient of friction is as follows: Different road surface information is used to obtain the friction coefficient between the vehicle and the road surface, and the same road surface information is used as a type of road surface for management. Based on driving on different types of road surfaces, basic vehicle information is obtained during constant-speed driving, and then the friction coefficient on that road segment is obtained. The formula for calculating the friction coefficient is: ； in, The coefficient of friction, For torque, For gearbox gear ratio, For the final gear ratio, For mechanical efficiency, For tire radius and For the weight of the car; The friction coefficient, corresponding to different road surface types, is used as a braking reference data and stored in the braking control system; At the same time, the corresponding friction coefficients are obtained again based on the same construction type and the water condition of the road surface, and are stored in the braking control system as braking reference data. The original tires were designed for different road surfaces and wet surfaces, serving as a reference road condition; At the same time, the corresponding coefficient of friction is obtained based on the degree of tire wear, which is obtained as follows: In the safe service life of a tire, the wear level is divided into three grades: first-grade wear, second-grade wear, and third-grade wear. The tire wear level is classified according to the number of kilometers the tire has traveled. The friction coefficient is obtained by determining the three levels of tire wear corresponding to the reference road surface conditions.

3. The vehicle braking control method according to claim 1, characterized in that: The actual vehicle driving data is obtained in the following ways: The system obtains reference road surface information of the current road where the car is driving, and then calculates the friction coefficient of the current road based on the tire wear level, thus forming the actual car driving data.

4. The automobile braking control method according to claim 1, characterized in that: The method for marking driving characteristics is as follows: It obtains car navigation route information from the Internet and records the routes based on the navigation route information to form frequently used driving paths; In frequently traveled routes, vehicle travel routes are collected based on road segments and feature markings are performed. The feature markings are large changes in speed. When driving on frequently traveled routes, travel feature markings are collected based on time, and time is divided into time periods for separate management to obtain time period travel feature markings. The driving characteristics of different time periods are marked and the corresponding frequent driving routes are stored in the braking control system.

5. A vehicle braking control system for implementing the braking control method according to any one of claims 1-4, characterized in that: It includes a vehicle information collection unit, a brake safety setting unit, a road information acquisition unit, a brake control system, a road familiarization marking unit, a brake status management unit, and a client.

6. A vehicle braking control system according to claim 5, characterized in that: The vehicle information acquisition unit is used to collect basic vehicle information and form braking reference data; The road information acquisition unit is used to collect road surface data along the vehicle's driving route and provide a reference for road surface information during the vehicle's driving process; The braking safety setting unit is used to obtain a threshold limit for vehicle speed based on vehicle braking reference data; The familiar road marking unit is used to mark the driving characteristics of frequently traveled routes, and to store and update the driving characteristic marking data according to time periods; The braking state management unit is used to reflect the braking state of the vehicle during driving, corresponding to the route the vehicle is traveling at that time, and to analyze the braking state data during driving to form a braking habit index.

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