CN116552488A - Method and device for controlling braking heat deterioration of vehicle, vehicle and storage medium - Google Patents

Method and device for controlling braking heat deterioration of vehicle, vehicle and storage medium Download PDF

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Publication number
CN116552488A
CN116552488A CN202310779812.XA CN202310779812A CN116552488A CN 116552488 A CN116552488 A CN 116552488A CN 202310779812 A CN202310779812 A CN 202310779812A CN 116552488 A CN116552488 A CN 116552488A
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CN
China
Prior art keywords
vehicle
speed
braking
prompt
speed limit
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CN202310779812.XA
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Chinese (zh)
Inventor
陶俊龙
肖波
翟钧
苏琳珂
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Deep Blue Automotive Technology Co ltd
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Deep Blue Automotive Technology Co ltd
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Priority to CN202310779812.XA priority Critical patent/CN116552488A/en
Publication of CN116552488A publication Critical patent/CN116552488A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/18—Safety devices; Monitoring
    • B60T17/22—Devices for monitoring or checking brake systems; Signal devices
    • 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
    • B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
    • B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
    • 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
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/42—Drive Train control parameters related to electric machines
    • B60L2240/423—Torque
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Regulating Braking Force (AREA)

Abstract

The present application relates to the field of vehicle control technologies, and in particular, to a method and apparatus for controlling braking heat fade of a vehicle, and a storage medium, where the method includes: acquiring an actual temperature of a brake disc of the vehicle; when the actual temperature of the brake disc is greater than a temperature threshold value, judging that the brake disc is in a brake heat fading working condition, activating a brake fading speed limiting function of the vehicle, and limiting the highest speed of the vehicle to be a target speed by utilizing the brake fading speed limiting function; and controlling the speed of the vehicle to be within the target speed until the actual temperature of the brake disc is less than or equal to the temperature threshold value, and inactivating the braking decline speed limiting function of the vehicle. Therefore, the problems that information warning is not carried out and the vehicle is actively controlled under the condition that the temperature of the brake disc is too high, the expected braking safety of the vehicle cannot be guaranteed and the like in the prior art are solved.

Description

Method and device for controlling braking heat deterioration of vehicle, vehicle and storage medium
Technical Field
The invention relates to the technical field of vehicle control, in particular to a method and a device for controlling braking heat decay of a vehicle, the vehicle and a storage medium.
Background
The vehicle braking performance is affected by the temperature of the brake disc, and when the temperature of the brake disc is too high, the vehicle braking performance is directly heat degraded. Particularly, in the continuous rapid acceleration and rapid deceleration processes of the vehicle, the brake disc is continuously heated, the heat dissipation time is too short, the vehicle is enabled to generate braking heat fading phenomenon, even failure, and the vehicle is brought with great safety risk. Therefore, how to control the driving function of the vehicle to ensure the safety of the expected braking process of the vehicle to the greatest extent is a problem to be solved in the industry at present after the braking performance of the vehicle is declined.
The related technology provides a method for monitoring the temperature of a brake disc in real time, which is mainly characterized in that the heat dissipation temperature is calculated according to a proper vehicle temperature model, and then the vehicle state data is fused to realize the real-time monitoring of the temperature of the brake disc. However, the method only monitors the temperature of the brake disc of the vehicle, and does not warn information and actively control the vehicle under the condition of the over-temperature of the brake disc; another related art provides a brake heat fade alarm system for alarming when the brake performance is heat fade, which is mainly characterized in that the temperature alarm is performed according to the magnitude relation between the actual temperature detected by a temperature sensor arranged in a brake friction plate and a preset temperature threshold value. However, the method only alarms the temperature of the driver and does not actively control the vehicle; another related art provides a hydraulic compensation method for vehicle braking decline, which is mainly characterized in that a hydraulic compensation pressure value is calculated according to a difference value between an actual deceleration and a target deceleration of a vehicle under a vehicle braking condition. However, the method only considers the brake compensation control in the braking process of the vehicle, does not give information prompt to the driver, and does not consider the control of the driving process of the vehicle after the braking heat is attenuated so as to ensure the expected braking safety of the vehicle.
Disclosure of Invention
The invention aims to provide a method for controlling braking heat decay of a vehicle, which solves the problems that in the prior art, under the condition of overhigh temperature of a brake disc, information warning is not carried out, the vehicle is actively controlled, and the expected braking safety of the vehicle cannot be ensured; the second object is to provide a brake heat fade control device for a vehicle; a third object is to provide a vehicle; a fourth object is to provide a computer-readable storage medium.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a method of controlling braking heat deterioration of a vehicle, comprising the steps of: acquiring an actual temperature of a brake disc of the vehicle; when the actual temperature of the brake disc is greater than a temperature threshold value, judging that the brake disc is in a braking heat fading working condition, activating a braking fading speed limiting function of the vehicle, and limiting the highest vehicle speed of the vehicle to be a target vehicle speed by utilizing the braking fading speed limiting function; and controlling the speed of the vehicle to be within the target speed until the actual temperature of the brake disc is less than or equal to the temperature threshold value, and inactivating the braking decline speed limiting function of the vehicle.
According to the technical means, when the actual temperature of the brake disc of the vehicle exceeds the temperature threshold, the braking decline speed limiting function of the vehicle can be automatically activated, the highest speed of the vehicle is limited to be the target speed, the speed of the vehicle is controlled to be within the target speed, and when the actual temperature of the brake disc does not exceed the temperature threshold, the braking decline speed limiting function of the vehicle is deactivated, active control of the vehicle is realized, and the expected braking safety of the vehicle is ensured.
Further, the limiting the maximum vehicle speed of the vehicle to a target vehicle speed by using the braking fade speed limiting function includes: identifying an actual number of brake discs in a braking heat fade condition; determining a speed limit level of the vehicle according to the actual quantity; and limiting the highest speed of the vehicle to a target speed limit corresponding to the speed limit level.
According to the technical means, the speed limit grade of the vehicle can be determined according to the actual number of the brake discs under the braking heat fading working condition, and the highest speed of the vehicle is further limited according to the speed limit grade, so that the speed limit according to different conditions is realized, and the requirements of users and the expected braking safety of the vehicle under different conditions are considered.
Further, determining a speed limit level of the vehicle based on the actual quantity, comprising: if the actual number is the first number, the speed limit level is the first speed limit level; if the actual number is the second number, the speed limit level is a second speed limit level, wherein the target speed limit corresponding to the second speed limit level is smaller than the target speed limit corresponding to the first speed limit level; and if the actual number is greater than the second number, the speed limit grade is a third speed limit grade, wherein the target speed limit corresponding to the third speed limit grade is smaller than the target speed limit corresponding to the second speed limit grade.
According to the technical means, the embodiment of the application can judge the braking heat fading degree of the vehicle according to the over-temperature quantity of the vehicle brake disc, so that the highest speed of the vehicle is limited in a grading manner, and the expected braking safety of the vehicle is ensured to the greatest extent.
Further, after activating the braking decline speed limiting function of the vehicle, further comprising: generating first prompt information; and carrying out braking heat fading prompt and/or speed limit prompt on the user by utilizing the first prompt information.
According to the technical means, the first prompt information can be generated, one or more of braking heat fading prompt and speed limiting prompt are carried out on the user by utilizing the first prompt information, and active prompt on the user is achieved.
Further, the step of using the first prompt information to prompt the user for braking heat fade and/or speed limit comprises the following steps: matching the prompt level of the first prompt message according to the speed limit level; and controlling an execution structure corresponding to the prompt level to execute the braking heat fading prompt and/or the speed limit prompt of the first prompt information.
According to the technical means, the method and the device can remind different degrees according to the current speed limit level of the vehicle, and meet requirements for prompting degrees under different conditions.
Further, the matching the prompt level of the first prompt message according to the speed limit level includes: if the speed limit grade is the first speed limit grade, the prompt grade is the first prompt grade; if the speed limit grade is a second speed limit grade, the prompt grade is a second prompt grade, wherein the prompt degree of the second prompt grade is larger than that of the first prompt grade; and if the speed limit grade is a third speed limit grade, the prompt grade is a third prompt grade, wherein the prompt degree of the third prompt grade is larger than that of the second prompt grade.
According to the technical means, the embodiment of the application can prompt the user with different grades according to different speed limiting grades, and the user is more fit with specific conditions.
Further, before activating the braking decline speed limiting function of the vehicle, further comprising: identifying whether a user turns on the braking decay rate limiting function; if the user starts the braking decline speed limiting function, the braking decline speed limiting function of the vehicle is activated when the brake disc is in a braking heat decline working condition; and if the user does not start the braking fade speed limiting function, generating second prompt information when the braking disc is in a braking fade working condition, and utilizing the second prompt information to carry out braking fade prompt and/or driving safety prompt on the user.
According to the technical means, when the user starts the braking decline speed limiting function, the vehicle can automatically activate the braking decline speed limiting function to limit the vehicle speed, and when the user does not start, the vehicle generates the second prompt information according to the temperature of the brake disc to prompt the user to control the vehicle speed so as to ensure the expected braking safety of the vehicle.
Further, before activating the braking decline speed limiting function of the vehicle, further comprising: identifying the current road condition of the vehicle; and if the current road condition is the preset road condition, forcibly starting the braking decline speed limiting function.
According to the technical means, the embodiment of the application can forcedly start the braking decline speed limiting function when the current road condition of the vehicle is a special condition so as to ensure driving safety.
Further, the controlling the vehicle speed of the vehicle within the target vehicle speed includes: acquiring the current speed of the vehicle; if the current vehicle speed is greater than the target vehicle speed, calculating a vehicle speed difference value between the current vehicle speed and the target vehicle speed, and reducing the torque of the driving motor to the target torque according to the vehicle speed difference value; and controlling the current speed of the vehicle to be within the target speed through the target torque.
According to the technical means, the embodiment of the application takes the difference value between the current actual speed and the target speed of the vehicle as a control target, and the torque of the driving motor is taken as a control quantity to control the speed so as to ensure that the speed of the vehicle falls into the target speed.
A brake heat fade control device of a vehicle, comprising: the acquisition module is used for acquiring the actual temperature of the brake disc of the vehicle; the limiting module is used for judging that the brake disc is in a braking heat fading working condition when the actual temperature of the brake disc is greater than a temperature threshold value, activating a braking fading speed limiting function of the vehicle, and limiting the highest vehicle speed of the vehicle to be a target vehicle speed by utilizing the braking fading speed limiting function; and the control module is used for controlling the speed of the vehicle to be within the target speed until the actual temperature of the brake disc is less than or equal to the temperature threshold value, and inactivating the braking decline speed limiting function of the vehicle.
Further, the limiting module is further to: identifying an actual number of brake discs in a braking heat fade condition; determining a speed limit level of the vehicle according to the actual quantity; and limiting the highest speed of the vehicle to a target speed limit corresponding to the speed limit level.
Further, the limiting module is further to: determining a speed limit level of the vehicle according to the actual quantity, including: if the actual number is the first number, the speed limit level is the first speed limit level; if the actual number is the second number, the speed limit level is a second speed limit level, wherein the target speed limit corresponding to the second speed limit level is smaller than the target speed limit corresponding to the first speed limit level; and if the actual number is greater than the second number, the speed limit grade is a third speed limit grade, wherein the target speed limit corresponding to the third speed limit grade is smaller than the target speed limit corresponding to the second speed limit grade.
Further, the method further comprises the following steps: the first prompt module is used for generating first prompt information after the braking decline speed limiting function of the vehicle is activated; and carrying out braking heat fading prompt and/or speed limit prompt on the user by utilizing the first prompt information.
Further, the first prompting module is further configured to: matching the prompt level of the first prompt message according to the speed limit level; and controlling an execution structure corresponding to the prompt level to execute the braking heat fading prompt and/or the speed limit prompt of the first prompt information.
Further, the first prompting module is further configured to: if the speed limit grade is the first speed limit grade, the prompt grade is the first prompt grade; if the speed limit grade is a second speed limit grade, the prompt grade is a second prompt grade, wherein the prompt degree of the second prompt grade is larger than that of the first prompt grade; and if the speed limit grade is a third speed limit grade, the prompt grade is a third prompt grade, wherein the prompt degree of the third prompt grade is larger than that of the second prompt grade.
Further, the method further comprises the following steps: the second prompting module is used for identifying whether a user starts the braking decline speed limiting function before the braking decline speed limiting function of the vehicle is activated; if the user starts the braking decline speed limiting function, the braking decline speed limiting function of the vehicle is activated when the brake disc is in a braking heat decline working condition; and if the user does not start the braking fade speed limiting function, generating second prompt information when the braking disc is in a braking fade working condition, and utilizing the second prompt information to carry out braking fade prompt and/or driving safety prompt on the user.
Further, the method further comprises the following steps: the identifying module is used for identifying the current road condition of the vehicle before activating the braking decline speed limiting function of the vehicle; and if the current road condition is the preset road condition, forcibly starting the braking decline speed limiting function.
Further, the control module is further to: acquiring the current speed of the vehicle; if the current vehicle speed is greater than the target vehicle speed, calculating a vehicle speed difference value between the current vehicle speed and the target vehicle speed, and reducing the torque of the driving motor to the target torque according to the vehicle speed difference value; and controlling the current speed of the vehicle to be within the target speed through the target torque.
A vehicle, comprising: the braking heat fade control device comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the program to realize the braking heat fade control method of the vehicle according to the embodiment.
A computer-readable storage medium having stored thereon a computer program that is executed by a processor for implementing the braking heat fade control method of a vehicle as described in the above embodiment.
The invention has the beneficial effects that:
(1) According to the method and the device, when the actual temperature of the brake disc of the vehicle exceeds the temperature threshold, the braking decline speed limiting function of the vehicle is automatically activated, the highest speed of the vehicle is limited to be the target speed, the speed of the vehicle is controlled to be within the target speed, and when the actual temperature of the brake disc does not exceed the temperature threshold, the braking decline speed limiting function of the vehicle is deactivated, active control of the vehicle is achieved, and the expected braking safety of the vehicle is guaranteed.
(2) According to the method and the device for limiting the speed of the vehicle, the speed limit level of the vehicle can be determined according to the actual number of the brake discs under the braking heat fading working condition, the highest speed of the vehicle is further limited according to the speed limit level, the speed is limited according to different conditions, and the requirements of users and the expected braking safety of the vehicle under different conditions are considered.
(3) According to the method and the device for controlling the braking heat fading degree of the vehicle, the braking heat fading degree of the vehicle can be judged according to the number of the overtemperature of the vehicle braking disc, so that the highest speed of the vehicle is limited in a grading mode, and the expected braking safety of the vehicle is guaranteed to the greatest extent.
(4) According to the method and the device for prompting the braking heat fading, the first prompting information can be generated, one or more of braking heat fading prompting and speed limiting prompting are carried out on the user by utilizing the first prompting information, and active prompting on the user is achieved.
(5) According to the method and the device, reminding of different degrees can be conducted according to the current speed limit level of the vehicle, and requirements for the reminding degree under different conditions are met.
(6) According to the embodiment of the application, different grades of prompts can be carried out on the user according to different speed limiting grades, and specific conditions are attached more.
(7) According to the method and the device for controlling the speed of the automobile, when the user starts the braking decline speed limiting function, the automobile can automatically activate the braking decline speed limiting function to limit the automobile speed, and when the user does not start, the automobile generates second prompt information according to the temperature of the brake disc to prompt the user to control the automobile speed so as to ensure the expected braking safety of the automobile.
(8) According to the embodiment of the application, when the current road condition of the vehicle is special, the braking decline speed limiting function is forced to be started, so that the driving safety is ensured.
(9) According to the method and the device for controlling the speed of the vehicle, the difference value between the current actual speed and the target speed of the vehicle is used as a control target, and the torque of the driving motor is used as a control quantity to control the speed, so that the speed of the vehicle is ensured to be reduced to the target speed.
Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the application.
Drawings
Fig. 1 is a schematic diagram of a braking heat fade control system of a vehicle according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a method for controlling braking heat deterioration of a vehicle according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method for controlling braking heat deterioration of a vehicle according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of activating a corresponding speed limiting mode according to the over-temperature amount of a brake disc according to an embodiment of the present invention;
fig. 5 is a schematic block diagram of a braking heat fade control device for a vehicle according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a vehicle according to an embodiment of the present invention.
Detailed Description
Further advantages and effects of the present invention will become readily apparent to those skilled in the art from the disclosure herein, by referring to the accompanying drawings and the preferred embodiments. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be understood that the preferred embodiments are presented by way of illustration only and not by way of limitation.
It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
Before describing the braking heat fade control method of the vehicle of the present application, a braking heat fade control system of the vehicle is described, as shown in fig. 1, including: the vehicle speed control system comprises a man-machine interaction module 102, a vehicle state detection module 102, a vehicle speed control module 103, a driving motor module 104 and a HU display module 105.
The man-machine interaction module 101 is used for a driver to actively start or close a braking decline speed limiting function; the vehicle state monitoring module 102 is configured to collect driving data in real time during a running process of the vehicle, and specifically includes one or more signals of a vehicle power state, an actual gear, an actual vehicle speed, an accelerator opening, a brake pedal opening, and a brake disc temperature; the vehicle speed control module 103 is used for sending a motor output torque signal to the motor execution module after performing logic processing and judgment on the received data; the driving motor module 104 is used for receiving the signal sent by the vehicle speed control module and executing corresponding actions; the HU display module 105 is configured to prompt the driver with information during activation of the braking fade rate limiting function, where the information prompt includes a function activation indicator and a text prompt after the function activation, such as an over-temperature of the brake disc, a speed limit, etc.
Specifically, fig. 2 is a schematic flow chart of a method for controlling braking heat fade of a vehicle according to an embodiment of the present application.
As shown in fig. 2, the brake heat fade control method of the vehicle includes the steps of:
in step S101, the actual temperature of the brake disc of the vehicle is acquired.
The brake disc may be any wheel brake disc, such as a front left wheel, a rear left wheel, a front right wheel, a rear right wheel, and the like, so that the embodiment of the application may obtain the actual temperature of the brake disc of one or more wheels according to the actual situation.
In step S102, when the actual temperature of the brake disc is greater than the temperature threshold, it is determined that the brake disc is in a braking heat fade condition, a braking fade speed limit function of the vehicle is activated, and the maximum vehicle speed of the vehicle is limited to be a target vehicle speed by using the braking fade speed limit function.
The temperature threshold can be set according to specific conditions, and can be determined according to actual vehicle calibration in relation to the friction materials of the brake disc and the design parameters of the vehicle.
It can be understood that when the actual temperature of the brake disc is greater than the temperature threshold, the brake disc decline speed limiting function of the vehicle is automatically activated, and the highest speed of the vehicle is limited as the target speed, so that the expected braking safety of the vehicle is ensured.
It should be noted that, in order to avoid brake disc temperature jump to cause brake fade speed limiting function, the embodiment of the application may perform filtering processing on the collected brake temperature signal, then compare the processed brake disc temperature signal with a preset temperature threshold, and when any brake disc temperature of the vehicle exceeds the preset temperature threshold, activate the brake fade speed limiting function.
In the embodiment of the present application, limiting the highest vehicle speed of the vehicle to the target vehicle speed by using the braking fade speed limiting function includes: identifying an actual number of brake discs in a braking heat fade condition; determining the speed limit level of the vehicle according to the actual quantity; and limiting the highest speed of the vehicle to a target speed limit corresponding to the speed limit level.
It can be understood that the speed limit level of the vehicle can be determined according to the actual number of the brake discs under the braking heat fading working condition, and the highest speed of the vehicle is further limited according to the speed limit level, so that the speed limit is realized according to different conditions, and the requirements of users and the expected braking safety of the vehicle under different conditions are considered.
In the embodiment of the application, determining the speed limit level of the vehicle according to the actual quantity comprises the following steps: if the actual number is the first number, the speed limit level is the first speed limit level; if the actual number is the second number, the speed limit level is the second speed limit level, wherein the target speed limit corresponding to the second speed limit level is smaller than the target speed limit corresponding to the first speed limit level; and if the actual number is greater than the second number, the speed limit level is a third speed limit level, wherein the target speed limit corresponding to the third speed limit level is smaller than the target speed limit corresponding to the second speed limit level.
It can be understood that the embodiment of the application can judge the braking heat fading degree of the vehicle according to the over-temperature quantity of the braking disc of the vehicle, so that the highest speed of the vehicle is limited in a grading way, and the expected braking safety of the vehicle is ensured to the greatest extent.
For example, when the number of the over-temperatures of the brake discs is 1, the speed limit level may be a first speed limit level, the expected braking safety of the vehicle under the level is higher, the actual requirement of the driver should be met to the maximum extent, and the target speed limit may be set to 120km/h; when the number of the overtemperatures of the brake disc is 2, the speed limit grade can be a second speed limit grade, the expected braking safety of the vehicle and the actual demand of a driver are considered under the grade, and the target speed limit can be set to be 100km/h; when the number of brake disc overtemperatures is greater than 2, the speed limit level may be a third speed limit level at which the expected braking safety of the vehicle is emphasized, at which time the target speed limit may be set to 80km/h.
In an embodiment of the present application, after activating the braking decline speed limiting function of the vehicle, the method further includes: generating first prompt information; and carrying out braking heat fading prompt and/or speed limit prompt on the user by utilizing the first prompt information.
The first prompt message is used for prompting a user that the temperature of the brake disc is too high, paying attention to control the running speed and limiting the speed. Specifically, a first prompt message of 'the brake disc is too high in temperature and the vehicle speed is limited' can be displayed through a popup window in a vehicle electronic instrument screen or a Head-up-Display (HUD) Display screen.
In this embodiment of the application, the first prompt information is used to prompt a user for braking heat fade and/or speed limit, including: matching the prompt level of the first prompt message according to the speed limit level; and controlling an execution structure corresponding to the prompt level to execute the braking heat fade prompt and/or the speed limit prompt of the first prompt information.
The execution structure may be a HU display module of the vehicle.
It can be appreciated that the embodiment of the application can match the prompt level of the first prompt message according to the current speed limit level of the vehicle, and control the HU display module to display one or more of a braking heat fade prompt and a speed limit prompt of the first prompt message.
Further, matching the prompt level of the first prompt message according to the speed limit level includes: if the speed limit grade is the first speed limit grade, the prompt grade is the first prompt grade; if the speed limit grade is the second speed limit grade, the prompt grade is the second prompt grade, wherein the prompt degree of the second prompt grade is larger than that of the first prompt grade; if the speed limit level is the third speed limit level, the prompt level is the third prompt level, wherein the prompt level of the third prompt level is greater than the prompt level of the second prompt level.
It can be appreciated that, according to the embodiment of the application, reminding of different degrees can be performed according to the current speed limit level of the vehicle, and requirements for the reminding degree under different conditions are met.
In an embodiment of the present application, before activating the braking decline speed limiting function of the vehicle, the method further includes: identifying whether a user starts a braking decline speed limiting function; if the user starts the braking decline speed limiting function, the braking decline speed limiting function of the vehicle is activated when the brake disc is in a braking heat decline working condition; if the user does not start the braking fade speed limiting function, generating second prompt information when the brake disc is in a braking heat fade working condition, and carrying out braking heat fade prompt and/or driving safety prompt on the user by utilizing the second prompt information.
The second prompt information user prompts the user that the current temperature of the brake disc is too high, and the vehicle speed needs to be controlled to ensure safety.
It should be noted that, in order to more satisfy the requirement of the user and the state of the vehicle, the user may actively select to turn on or off the braking decline speed limiting function of the vehicle, where the switch key may be set as a virtual key in the central control screen of the cab. In addition, in order to avoid the influence of the ON-off operation of the function ON the drivability and chassis function of the vehicle during the running process of the vehicle, the operable scene of the braking decline speed limiting function should be limited, for example, the driver is allowed to operate the function key when the vehicle power supply is in ON gear and the vehicle gear is in P gear, and the state of the function needs to be memorized after the vehicle is powered down.
It can be understood that when a user starts the braking decline speed limiting function, the braking decline speed limiting function of the vehicle is activated when the brake disc is in a braking heat decline working condition, and the vehicle speed is limited; when the user does not start the braking decline speed limiting function, the vehicle generates a second prompt message prompt (such as a text prompt of "the brake disc is too high and the vehicle speed is controlled") according to the temperature of the brake disc to prompt the user to control the vehicle speed so as to ensure the expected braking safety of the vehicle.
In an embodiment of the present application, before activating the braking decline speed limiting function of the vehicle, the method further includes: identifying the current road condition of the vehicle; if the current road condition is the preset road condition, the braking decline speed limiting function is forcedly started.
The preset road conditions comprise more road curves, more hollow sections, more vehicles, speed-limiting sections and the like.
It can be understood that when the current road condition of the vehicle is a special condition, the embodiment of the application can forcedly start the braking decline speed limiting function so as to ensure the driving safety.
In step S103, the vehicle speed of the vehicle is controlled to be within the target vehicle speed until the actual temperature of the brake disc is less than or equal to the temperature threshold value, and the braking decline speed limiting function of the vehicle is deactivated.
It can be understood that the motor execution module in the embodiment of the application actively adjusts the motor torque based on the target vehicle speed signal output by the vehicle speed control module in the embodiment to control the highest running vehicle speed of the vehicle, until the actual temperature of the brake disc is less than or equal to the temperature threshold value, the braking decline speed limiting function of the vehicle is deactivated, and the expected braking safety of the vehicle is ensured.
In an embodiment of the present application, controlling a vehicle speed of a vehicle within a target vehicle speed includes: acquiring the current speed of the vehicle; if the current vehicle speed is greater than the target vehicle speed, calculating a vehicle speed difference value between the current vehicle speed and the target vehicle speed, and reducing the torque of the driving motor to the target torque according to the vehicle speed difference value.
It can be understood that the embodiment of the application can adopt a PID control algorithm, take the difference value between the current actual speed of the vehicle and the target speed as a control target, and take the torque of the driving motor as a control quantity to control the speed so as to ensure that the speed of the vehicle falls into the target speed.
The following describes a method for controlling braking heat deterioration of a vehicle according to one embodiment, and the flow is shown in fig. 3, and includes:
s201: and acquiring the starting state of the speed limiting function of the braking decline of the vehicle. The driver can select to open or close the braking decline speed limiting function according to the self demand and the vehicle state, so as to avoid the influence on the drivability and the chassis function of the vehicle caused by the opening and closing operation of the function in the running process of the vehicle, and limit the operable scene of the braking decline speed limiting function. Preferably, the driver is allowed to operate the function button only when the vehicle power supply is in ON gear and the vehicle gear is in P gear, and the function state is required to be memorized after the vehicle is powered down.
S202: the method comprises the steps of acquiring the temperatures of brake discs of a left front wheel, a left rear wheel, a right front wheel and a right rear wheel of a vehicle in real time, and judging the activation state of a brake disc decay function according to a preset brake disc temperature threshold. Specifically, in order to avoid false triggering of braking decline speed limiting function caused by temperature jump of the brake disc, the collected brake disc temperature signal needs to be subjected to filtering treatment, and then the processed brake disc temperature signal is compared with a preset temperature threshold value (preferably, the temperature threshold value is related to a brake disc friction material and a vehicle design parameter and can be determined according to actual vehicle calibration). And when the temperature of any brake disc of the vehicle exceeds a preset temperature threshold value, activating a braking decline speed limiting function.
S203: after the braking decline speed limiting function is activated, a character prompt is needed to be carried out on the vehicle to warn a driver that the temperature of a brake disc is too high, and the driving speed is controlled. Preferably, a popup window in a vehicle electronic instrument screen or a HUD display screen can display the prompt message of 'the brake disc is too high in temperature and the vehicle speed is limited' until the function is out of activation.
S204: when the braking fade speed limiting function is activated, the motor torque is adjusted according to the current speed of the vehicle and a preset speed limit (the speed limit is different according to different speed limiting modes) so as to control the highest running speed of the vehicle. Preferably, a PID control algorithm can be adopted, the difference between the current actual speed of the vehicle and the speed-limiting speed is used as a control target, and the torque of the driving motor is used as a control quantity to control the speed.
Fig. 4 is a schematic flow chart of activating a corresponding speed limiting mode according to the number of over-temperature of a brake disc in the embodiment of the present application, and judging the degree of braking heat degradation of a vehicle according to the number of over-temperature of the brake disc of the vehicle, so as to limit the highest speed of the vehicle in a grading manner, so as to maximally ensure the expected braking safety of the vehicle, including:
s301: and judging whether the number of the over-temperatures of the brake disc is one, and if so, activating a first speed limiting mode. The expected braking safety of the vehicle in the mode is high, and the actual requirement of a driver is met to the greatest extent. Preferably, the preset vehicle speed limit value in the first speed limit mode may be set to 120km/h.
S302: and judging whether the number of the over-temperatures of the brake discs is two, and if so, activating a second speed limiting mode. In this mode, both the intended braking safety of the vehicle and the actual demands of the driver are considered. Preferably, the preset vehicle speed limit value in the second speed limit mode may be set to 100km/h.
S303: and if the number of the overtemperatures of the brake disc of the vehicle is greater than two, activating a third speed limiting mode. In this mode, the expected braking safety of the vehicle is considered with great importance. Preferably, the preset vehicle speed limit value in the third speed limit mode may be set to 80km/h.
According to the braking heat fading control method for the vehicle, when the actual temperature of the brake disc of the vehicle exceeds the temperature threshold value, the braking fading speed limiting function of the vehicle can be automatically activated, the highest speed of the vehicle is limited to be the target speed, the speed of the vehicle is controlled to be within the target speed, and when the actual temperature of the brake disc does not exceed the temperature threshold value, the braking fading speed limiting function of the vehicle is deactivated, active control of the vehicle is achieved, and the expected braking safety of the vehicle is guaranteed.
Next, a brake heat fade control device of a vehicle according to an embodiment of the present application will be described with reference to the accompanying drawings.
Fig. 5 is a block schematic diagram of a brake heat fade control device of a vehicle according to an embodiment of the present application.
As shown in fig. 5, the brake heat fade control device 20 of the vehicle includes: an acquisition module 201, a restriction module 202 and a control module 203.
Wherein the acquisition module 201 is configured to acquire an actual temperature of a brake disc of the vehicle; the limiting module 202 is configured to determine that the brake disc is in a braking heat fade condition when the actual temperature of the brake disc is greater than a temperature threshold, activate a braking fade speed limiting function of the vehicle, and limit a highest speed of the vehicle to a target speed by using the braking fade speed limiting function; the control module 203 is configured to control a vehicle speed of the vehicle to be within a target vehicle speed until an actual temperature of the brake disc is less than or equal to a temperature threshold value, and deactivate a brake fade rate limiting function of the vehicle.
In the embodiment of the present application, the limiting module 202 is further configured to: identifying an actual number of brake discs in a braking heat fade condition; determining the speed limit level of the vehicle according to the actual quantity; and limiting the highest speed of the vehicle to a target speed limit corresponding to the speed limit level.
In the embodiment of the present application, the limiting module 202 is further configured to: determining a speed limit level of the vehicle based on the actual number, comprising: if the actual number is the first number, the speed limit level is the first speed limit level; if the actual number is the second number, the speed limit level is the second speed limit level, wherein the target speed limit corresponding to the second speed limit level is smaller than the target speed limit corresponding to the first speed limit level; and if the actual number is greater than the second number, the speed limit level is a third speed limit level, wherein the target speed limit corresponding to the third speed limit level is smaller than the target speed limit corresponding to the second speed limit level.
In the embodiment of the present application, the apparatus 20 of the embodiment of the present application further includes: and the first prompting module.
The first prompt module is used for generating first prompt information after activating a braking decline speed limiting function of the vehicle; and carrying out braking heat fading prompt and/or speed limit prompt on the user by utilizing the first prompt information.
In this embodiment of the present application, the first prompting module is further configured to: matching the prompt level of the first prompt message according to the speed limit level; and controlling an execution structure corresponding to the prompt level to execute the braking heat fade prompt and/or the speed limit prompt of the first prompt information.
In this embodiment of the present application, the first prompting module is further configured to: if the speed limit grade is the first speed limit grade, the prompt grade is the first prompt grade; if the speed limit grade is the second speed limit grade, the prompt grade is the second prompt grade, wherein the prompt degree of the second prompt grade is larger than that of the first prompt grade; if the speed limit level is the third speed limit level, the prompt level is the third prompt level, wherein the prompt level of the third prompt level is greater than the prompt level of the second prompt level.
In the embodiment of the present application, the apparatus 20 of the embodiment of the present application further includes: and a second prompting module.
The second prompting module is used for identifying whether a user starts the braking decline speed limiting function before the braking decline speed limiting function of the vehicle is activated; if the user starts the braking decline speed limiting function, the braking decline speed limiting function of the vehicle is activated when the brake disc is in a braking heat decline working condition; if the user does not start the braking fade speed limiting function, generating second prompt information when the brake disc is in a braking heat fade working condition, and carrying out braking heat fade prompt and/or driving safety prompt on the user by utilizing the second prompt information.
In the embodiment of the present application, the apparatus 20 of the embodiment of the present application further includes: and an identification module.
The recognition module is used for recognizing the current road condition of the vehicle before activating the braking decline speed limiting function of the vehicle; if the current road condition is the preset road condition, the braking decline speed limiting function is forcedly started.
In the embodiment of the present application, the control module 203 is further configured to: acquiring the current speed of the vehicle; if the current vehicle speed is greater than the target vehicle speed, calculating a vehicle speed difference value between the current vehicle speed and the target vehicle speed, and reducing the torque of the driving motor to the target torque according to the vehicle speed difference value; and controlling the current speed of the vehicle to be within the target speed through the target torque.
It should be noted that the foregoing explanation of the embodiment of the braking heat fade control method for a vehicle is also applicable to the braking heat fade control device for a vehicle of this embodiment, and will not be repeated here.
According to the braking heat fading control device for the vehicle, when the actual temperature of the brake disc of the vehicle exceeds the temperature threshold value, the braking fading speed limiting function of the vehicle can be automatically activated, the highest speed of the vehicle is limited to be the target speed, the speed of the vehicle is controlled to be within the target speed, and when the actual temperature of the brake disc does not exceed the temperature threshold value, the braking fading speed limiting function of the vehicle is deactivated, active control of the vehicle is achieved, and the expected braking safety of the vehicle is guaranteed.
Fig. 6 is a schematic structural diagram of a vehicle according to an embodiment of the present application. The vehicle may include:
a memory 601, a processor 602, and a computer program stored on the memory 601 and executable on the processor 602.
The processor 602 implements the braking heat fade control method of the vehicle provided in the above embodiment when executing a program.
Further, the vehicle further includes:
a communication interface 603 for communication between the memory 601 and the processor 602.
A memory 601 for storing a computer program executable on the processor 602.
The memory 601 may include a high-speed RAM (Random Access Memory ) memory, and may also include a nonvolatile memory, such as at least one disk memory.
If the memory 601, the processor 602, and the communication interface 603 are implemented independently, the communication interface 603, the memory 601, and the processor 602 may be connected to each other through a bus and perform communication with each other. The bus may be an ISA (Industry Standard Architecture ) bus, a PCI (Peripheral Component, external device interconnect) bus, or EISA (Extended Industry Standard Architecture ) bus, among others. The buses may be divided into address buses, data buses, control buses, etc. For ease of illustration, only one thick line is shown in fig. 6, but not only one bus or one type of bus.
Alternatively, in a specific implementation, if the memory 601, the processor 602, and the communication interface 603 are integrated on a chip, the memory 601, the processor 602, and the communication interface 603 may perform communication with each other through internal interfaces.
The processor 602 may be a CPU (Central Processing Unit ) or ASIC (Application Specific Integrated Circuit, application specific integrated circuit) or one or more integrated circuits configured to implement embodiments of the present application.
The present embodiment also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the braking heat fade control method of a vehicle as above.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "N" is at least two, such as two, three, etc., unless explicitly defined otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order from that shown or discussed, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present application.
It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the N steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable gate arrays, field programmable gate arrays, and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
Although embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims (12)

1. A method for controlling braking heat deterioration of a vehicle, comprising the steps of:
acquiring an actual temperature of a brake disc of the vehicle;
when the actual temperature of the brake disc is greater than a temperature threshold value, judging that the brake disc is in a braking heat fading working condition, activating a braking fading speed limiting function of the vehicle, and limiting the highest vehicle speed of the vehicle to be a target vehicle speed by utilizing the braking fading speed limiting function;
and controlling the speed of the vehicle to be within the target speed until the actual temperature of the brake disc is less than or equal to the temperature threshold value, and inactivating the braking decline speed limiting function of the vehicle.
2. The braking heat fade control method of a vehicle according to claim 1, characterized in that said limiting the maximum vehicle speed of the vehicle to a target vehicle speed by using the braking fade rate limiting function includes:
identifying an actual number of brake discs in a braking heat fade condition;
determining a speed limit level of the vehicle according to the actual quantity;
and limiting the highest speed of the vehicle to a target speed limit corresponding to the speed limit level.
3. The braking heat fade control method of a vehicle according to claim 2, characterized in that determining a speed limit level of the vehicle from the actual number includes:
if the actual number is the first number, the speed limit level is the first speed limit level;
if the actual number is the second number, the speed limit level is a second speed limit level, wherein the target speed limit corresponding to the second speed limit level is smaller than the target speed limit corresponding to the first speed limit level;
and if the actual number is greater than the second number, the speed limit grade is a third speed limit grade, wherein the target speed limit corresponding to the third speed limit grade is smaller than the target speed limit corresponding to the second speed limit grade.
4. A braking heat fade control method for a vehicle according to claim 3, characterized by further comprising, after activating a braking fade rate limiting function of the vehicle:
generating first prompt information;
and carrying out braking heat fading prompt and/or speed limit prompt on the user by utilizing the first prompt information.
5. The method according to claim 4, wherein the step of providing the user with the first prompt message for braking heat deterioration and/or speed limitation includes:
matching the prompt level of the first prompt message according to the speed limit level;
and controlling an execution structure corresponding to the prompt level to execute the braking heat fading prompt and/or the speed limit prompt of the first prompt information.
6. The method of controlling braking heat deterioration of a vehicle according to claim 5, wherein the matching of the prompt level of the first prompt message according to the speed limit level includes:
if the speed limit grade is the first speed limit grade, the prompt grade is the first prompt grade;
if the speed limit grade is a second speed limit grade, the prompt grade is a second prompt grade, wherein the prompt degree of the second prompt grade is larger than that of the first prompt grade;
And if the speed limit grade is a third speed limit grade, the prompt grade is a third prompt grade, wherein the prompt degree of the third prompt grade is larger than that of the second prompt grade.
7. The brake fade control method of a vehicle according to claim 1, characterized by further comprising, before activating a brake fade rate limiting function of the vehicle:
identifying whether a user turns on the braking decay rate limiting function;
if the user starts the braking decline speed limiting function, the braking decline speed limiting function of the vehicle is activated when the brake disc is in a braking heat decline working condition;
and if the user does not start the braking fade speed limiting function, generating second prompt information when the braking disc is in a braking fade working condition, and utilizing the second prompt information to carry out braking fade prompt and/or driving safety prompt on the user.
8. The braking heat fade control method of a vehicle according to claim 1 or 7, characterized by further comprising, before activating a braking fade rate limiting function of the vehicle:
identifying the current road condition of the vehicle;
and if the current road condition is the preset road condition, forcibly starting the braking decline speed limiting function.
9. The braking heat fade control method of a vehicle according to claim 1, characterized in that the controlling the vehicle speed of the vehicle within the target vehicle speed includes:
acquiring the current speed of the vehicle;
if the current vehicle speed is greater than the target vehicle speed, calculating a vehicle speed difference value between the current vehicle speed and the target vehicle speed, and reducing the torque of the driving motor to the target torque according to the vehicle speed difference value;
and controlling the current speed of the vehicle to be within the target speed through the target torque.
10. A brake heat fade control device of a vehicle, characterized by comprising:
the acquisition module is used for acquiring the actual temperature of the brake disc of the vehicle;
the limiting module is used for judging that the brake disc is in a braking heat fading working condition when the actual temperature of the brake disc is greater than a temperature threshold value, activating a braking fading speed limiting function of the vehicle, and limiting the highest vehicle speed of the vehicle to be a target vehicle speed by utilizing the braking fading speed limiting function;
and the control module is used for controlling the speed of the vehicle to be within the target speed until the actual temperature of the brake disc is less than or equal to the temperature threshold value, and inactivating the braking decline speed limiting function of the vehicle.
11. A vehicle, characterized by comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor executing the program to implement the braking heat fade control method of a vehicle as claimed in any one of claims 1 to 9.
12. A computer-readable storage medium having stored thereon a computer program, characterized in that the program is executed by a processor for realizing the braking heat fade control method of a vehicle according to any one of claims 1 to 9.
CN202310779812.XA 2023-06-28 2023-06-28 Method and device for controlling braking heat deterioration of vehicle, vehicle and storage medium Pending CN116552488A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310779812.XA CN116552488A (en) 2023-06-28 2023-06-28 Method and device for controlling braking heat deterioration of vehicle, vehicle and storage medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310779812.XA CN116552488A (en) 2023-06-28 2023-06-28 Method and device for controlling braking heat deterioration of vehicle, vehicle and storage medium

Publications (1)

Publication Number Publication Date
CN116552488A true CN116552488A (en) 2023-08-08

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Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
CN (1) CN116552488A (en)

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