Wheel braking efficiency correction method and device, storage medium and electronic equipment

Abstract

The invention relates to a wheel braking efficiency correction method and device, a storage medium and electronic equipment, and belongs to the technical field of vehicle braking. The wheel braking efficiency correction method comprises the steps that the water amount of a brake disc is obtained; based on a preset water volume correction coefficient relation and the water volume of the brake disc, a first correction coefficient is determined and obtained; based on the first correction coefficient, the initial braking efficiency is corrected, and the new braking efficiency is obtained.According to the wheel braking efficiency correction method, the situation that in the driving process on rainy days, water stains possibly adhere to a brake disc, and the water stains can cause the braking efficiency to slide down is fully considered, the corrected braking efficiency is more accurate, and the service life of the vehicle is prolonged. The corrected braking efficiency value can further optimize the performance of the active braking function of the braking control system, and the performance of the active braking function of the braking control system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle braking, and in particular to a wheel braking effectiveness correction method, a wheel braking effectiveness correction device, a machine-readable storage medium and an electronic device. Background Art

[0002] The braking efficiency of a car, namely the braking distance and braking deceleration, refers to the braking distance from a car stopping at a certain initial speed on a good road or the deceleration of the car during braking. It is the most basic evaluation indicator of braking performance.

[0003] The software of the traditional brake control electronic control unit (ECU) contains wheel braking performance information, which is generally recorded in torque / pressure (Nm / bar), that is, the wheel end braking torque that can be generated by unit braking pressure, and its value is the wheel braking performance measured in advance during the vehicle development stage, and the value is fixed. However, during the actual operation of the vehicle, due to weather reasons, water stains may be attached to the brake disc, which will cause the actual braking performance of the brake disc to change, while the wheel braking performance in the software is a fixed value, resulting in inaccurate wheel braking performance in the software, which in turn reduces the performance of the active braking function of the brake control system. Summary of the invention

[0004] One of the purposes of the present invention is to provide a wheel braking efficiency correction method to solve the problem in the prior art that the wheel braking efficiency in the software is a fixed value, resulting in inaccurate wheel braking efficiency in the software, thereby reducing the performance of the active braking function of the braking control system; the second purpose is to provide a wheel braking efficiency correction device; the third purpose is to provide a machine-readable storage medium; and the fourth purpose is to provide an electronic device.

[0005] In order to achieve the above-mentioned object, the first aspect of the present application provides a wheel braking efficiency correction method, comprising:

[0006] Get the brake disc water level;

[0007] Determining a first correction coefficient based on a preset water volume correction coefficient relationship and the brake disc water volume;

[0008] Based on the first correction coefficient, the initial braking efficiency is corrected to obtain a new braking efficiency;

[0009] The preset water correction coefficient relationship is calculated by testing the vehicle's braking performance under different rainfall conditions before the vehicle leaves the factory.

[0010] In the embodiment of the present application, after determining to obtain the first correction coefficient, the method further includes:

[0011] Get the brake disc temperature range;

[0012] The method further comprises:

[0013] Based on the first correction coefficient and the second correction coefficient, the initial braking efficiency is corrected to obtain a new braking efficiency.

[0014] In the embodiment of the present application, obtaining the brake disc temperature range includes:

[0015] Obtain ambient temperature, vehicle speed and brake pressure;

[0016] Based on the ambient temperature, driving speed and brake pressure, a preset brake disc temperature estimation model is used to estimate the temperature range of the brake disc to obtain the brake disc temperature range.

[0017] In the embodiment of the present application, the temperature range of the brake disc is estimated based on the ambient temperature, the driving speed and the brake pressure using a preset brake disc temperature estimation model to obtain the brake disc temperature range, including:

[0018] Based on the ambient temperature, the driving speed and the brake pressure, respectively, a preset brake disc temperature estimation model is used to calculate a value of a temperature rise per unit time and a value of a temperature drop per unit time;

[0019] Based on the value of the temperature increase per unit time and the value of the temperature decrease per unit time, the brake disc temperature range is calculated.

[0020] In an embodiment of the present application, the method further includes:

[0021] After obtaining the new braking efficiency, determining whether the vehicle has completed a braking action;

[0022] It is determined that a braking action is completed, and a new braking efficiency is recalculated based on the second correction coefficient and the initial braking efficiency.

[0023] In the embodiment of the present application, obtaining the brake disc water volume includes:

[0024] Get the current rainfall level and the duration of the rainfall level;

[0025] The amount of water in the brake disc is obtained based on the current rainfall level and the duration of being in the current rainfall level.

[0026] A second aspect of the present application provides a wheel braking efficiency correction device, comprising:

[0027] A first acquisition module is used to acquire the amount of water in the brake disc;

[0028] A first determination module is used to determine a first correction coefficient based on a preset water correction coefficient relationship and the brake disc water volume; wherein the preset water correction coefficient relationship is obtained by testing and calculating the vehicle braking performance under different rainfall conditions before the vehicle leaves the factory;

[0029] The correction module is used to correct the initial braking efficiency based on the first correction coefficient to obtain a new braking efficiency.

[0030] In the embodiment of the present application, it also includes:

[0031] A second acquisition module is used to acquire a brake disc temperature range;

[0032] a second determination module, configured to determine a second correction coefficient based on the brake disc temperature range and a preset brake disc temperature correction coefficient relationship;

[0033] The combined correction module is used to correct the initial braking efficiency based on the first correction coefficient and the second correction coefficient to obtain a new braking efficiency.

[0034] A third aspect of the present application provides an electronic device, the electronic device comprising:

[0035] at least one processor;

[0036] a memory connected to the at least one processor;

[0037] The memory stores instructions that can be executed by the at least one processor, and the at least one processor implements the above-mentioned wheel braking efficiency correction method by executing the instructions stored in the memory.

[0038] A fourth aspect of the present application provides a machine-readable storage medium having instructions stored thereon, which, when executed by a processor, configures the processor to execute the above-mentioned wheel braking efficiency correction method.

[0039] Beneficial effects of the present invention:

[0040] (1) The correction method determines a first correction coefficient based on a preset water correction coefficient relationship and a brake disc water volume; based on the first correction coefficient, the initial braking performance is corrected to obtain a new braking performance, which fully considers that during driving in rainy days, the brake disc may be attached with water stains, and the water stains may cause the braking performance to decline, so that the corrected braking performance is more accurate;

[0041] (2) Furthermore, the corrected braking efficiency value will further optimize the performance of the active braking function of the braking control system. For example, for closed-loop control functions: automatic emergency braking, adaptive cruise control, the corrected braking efficiency value can optimize the closed-loop control and reduce the response time; for open-loop control functions: brake failure assist, emergency brake assist, etc., the correct braking efficiency can enable the braking system to establish an accurate target braking force, thereby improving the performance of the active braking function of the braking control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0043] Figure 1 A schematic diagram of a process flow of a wheel braking efficiency correction method according to an embodiment of the present application is shown;

[0044] Figure 2 The overall block diagram of the wheel braking efficiency correction implementation according to the embodiment of the present application is schematically shown;

[0045] Figure 3 A schematic diagram of a structure of a wheel braking efficiency correction device according to an embodiment of the present application is shown;

[0046] Figure 4 The internal structure of a computer device according to an embodiment of the present application is schematically shown.

[0047] Among them, 410-first acquisition module; 420-first determination module; 430-correction module; A01-processor; A02-network interface; A03-internal memory; A04-display screen; A05-input device; A06-non-volatile storage medium; B01-operating system; B02-computer program. DETAILED DESCRIPTION

[0048] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0049] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0050] It should be noted that if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0051] Please see Figure 1 , Figure 1 The flowchart of a wheel braking efficiency correction method according to an embodiment of the present application is schematically shown. This embodiment proposes a wheel braking efficiency correction method, comprising the following steps:

[0052] Step 210: Obtain the amount of water in the brake disc;

[0053] In this embodiment, the brake disc water volume refers to the brake disc water volume obtained in real time during the actual operation of the vehicle. In the case of the vehicle driving in rainy weather, the above acquisition can be obtained by collecting wiper switch signals or rain sensor information.

[0054] In some embodiments, obtaining the brake disc water volume includes:

[0055] First, obtain the current rainfall level and the duration of the current rainfall level;

[0056] Then, based on the current rainfall level and the duration of being in the current rainfall level, the amount of water in the brake disc is obtained.

[0057] In this embodiment, the current rain level reflects the amount of rain, which can be obtained by the position of the wiper switch or the position indicated by the rain sensor. Specifically, the amount of water in the brake disc can be obtained based on the time when the wiper switch is in the slow gear, the fast gear and the intermittent gear, or the time when the rain sensor indicates that the current amount of rain is low, medium and high.

[0058] Step 220: Determine a first correction coefficient based on a preset water correction coefficient relationship and the brake disc water volume; wherein the preset water correction coefficient relationship is calculated by testing the vehicle braking performance under different rainfall conditions before the vehicle leaves the factory;

[0059] In this embodiment, the preset water volume correction coefficient relationship reflects the relationship between the brake disc water volume and the correction coefficient, that is, different brake disc water volumes correspond to different correction coefficients. The above water volume correction coefficient relationship can be that before the vehicle leaves the factory, the vehicle braking performance is tested under different rainfall scenarios, and then the corresponding correction coefficient is calculated to establish the water volume correction coefficient relationship. Specifically, a specific or rated braking performance value can be set for the brake disc in advance, and then the braking performance under different brake disc water volumes is tested to obtain the braking performance under different brake disc water volumes; then the braking performance under different brake disc water volumes is divided by the rated braking performance, and the correction coefficient corresponding to the brake disc water volume is obtained, and then the relationship between the brake disc water volume and the corresponding correction coefficient can be constructed. After obtaining the brake disc water volume, the corresponding correction coefficient can be matched in the water volume correction coefficient relationship through the brake disc water volume, thereby obtaining the first correction coefficient.

[0060] Step 230: Based on the first correction coefficient, the initial braking performance is corrected to obtain a new braking performance.

[0061] The correcting of the initial braking efficiency to obtain the new braking efficiency includes: multiplying the value of the initial braking efficiency by the first correction coefficient to obtain the new braking efficiency.

[0062] In this embodiment, after obtaining the first correction coefficient, the braking efficiency can be corrected. Specifically, different correction rules can be formulated as needed to optimize the braking efficiency. It is common to multiply the value of the braking efficiency by the first correction coefficient to obtain a new braking efficiency. The calculation using this correction rule is simple and the corrected braking efficiency can be quickly obtained. It should be noted that other correction rules can also be used for correction based on the first correction coefficient, which is not limited in this embodiment.

[0063] In the above implementation process, the amount of water on the brake disc is obtained; based on the preset water correction coefficient relationship and the water amount on the brake disc, a first correction coefficient is determined; based on the first correction coefficient, the initial braking efficiency is corrected to obtain a new braking efficiency. The wheel braking efficiency correction method fully considers the situation that during driving in rainy days, water stains may be attached to the brake disc, and the water stains will cause the braking efficiency to decline, so that the corrected braking efficiency is more accurate. Furthermore, the corrected braking efficiency value will further optimize the performance of the active braking function of the braking control system. For example, for closed-loop control functions: automatic emergency braking, adaptive cruise control, correcting the braking efficiency value can optimize the closed-loop control and reduce the response time; for open-loop control functions: brake failure assist, emergency braking assist, etc., the correct braking efficiency can enable the braking system to establish an accurate target braking force, thereby improving the performance of the active braking function of the braking control system.

[0064] The above correction of braking performance only considers the influence of water stains on braking performance. Further, the influence of brake disc temperature on braking performance can also be considered, such as the decline of braking performance under high temperature. Therefore, in order to further improve the accuracy of braking performance, the braking performance can be further corrected based on the brake disc temperature.

[0065] In some embodiments, after determining the first correction coefficient, the following steps are further included:

[0066] First, obtain the brake disc temperature range;

[0067] In the present embodiment, the brake disc temperature range refers to the current temperature of the brake disc. Specifically, based on the ambient temperature, when the vehicle is in motion and accompanied by braking pressure, the temperature of the brake disc will accumulate and rise, and the trend is: the higher the vehicle speed and the greater the braking pressure, the faster the brake disc temperature rises; when the braking pressure is 0, the brake disc temperature begins to drop at a certain speed, and its drop rate is related to the vehicle speed. The faster the vehicle speed, the faster the temperature drops; when the vehicle is stationary, the brake disc temperature drops at a specific speed. Considering that the above-mentioned wiper is in a specific gear and a specific time, the brake disc temperature drop rate needs to be multiplied by a specific coefficient. The aforementioned brake disc temperature rise or drop rate and the temperature drop coefficient can be obtained through a specific test process before the vehicle leaves the factory, and stored in the brake control system in a calibrated manner. Therefore, the brake disc temperature range can be determined based on the ambient temperature, driving speed and braking pressure, which specifically includes the following steps:

[0068] The first step is to obtain the ambient temperature, driving speed and brake pressure;

[0069] In this embodiment, the ambient temperature may refer to the engine intake temperature, the temperature obtained by the temperature sensor of the air conditioner, etc., and may be obtained through controller area network (CAN) bus communication.

[0070] In a second step, based on the ambient temperature, driving speed and brake pressure, a preset brake disc temperature estimation model is used to estimate the temperature range of the brake disc to obtain the brake disc temperature range.

[0071] In this embodiment, the ambient temperature, driving speed and brake pressure can be input into a preset brake disc temperature estimation model to obtain a brake disc temperature range. The above brake disc temperature estimation model is constructed by considering multiple factors such as friction heat generation, heat radiation, heat conduction and heat convection to estimate the brake disc temperature. The brake disc temperature estimation model includes the corresponding relationship between driving speed, brake pressure and brake disc temperature, and the relationship between rainfall and brake disc temperature.

[0072] In some embodiments, the calculation of the brake disc temperature range includes:

[0073] Firstly, based on the ambient temperature, driving speed and brake pressure, a preset brake disc temperature estimation model is used to calculate the value of temperature rise per unit time and the value of temperature drop per unit time;

[0074] Then, based on the value of the temperature increase per unit time and the value of the temperature decrease per unit time, the brake disc temperature range is calculated.

[0075] In this embodiment, the specific calculation process of the brake disc temperature range includes the calculation of the temperature rise process and the calculation of the temperature drop process. The calculation method of the temperature rise process is: multiply the current driving speed and the brake pressure, and then multiply by the coefficient of temperature rise per unit time, and accumulate the obtained product over time to obtain the value of temperature rise. The coefficient of temperature rise per unit time is obtained by looking up a table based on the current temperature, as shown in Table 1 below:

[0076] Table 1

[0077] X 66.00 243.000 413.000 Value 0.015 0.014 0.012

[0078] Where X is temperature; Value is the temperature rise coefficient, that is, the coefficient of temperature rise per unit time.

[0079] Among them, the calculation method of the temperature drop process is:

[0080] Considering the cooling due to heat conduction, the numerical calculation method of the temperature drop per unit time can be obtained by the following formula:

[0081]

[0082] Where dTDisc1 represents the value of the heat conduction temperature drop per unit time; TDisc represents the current brake disc temperature; Tambient represents the ambient temperature; v represents the real-time vehicle speed; K LinCoolFactor is the calculation coefficient 1, for example 0.00063, this value is an empirical value; K QuadCoolFactor To calculate the coefficient 2, for example, 3.3*10 -7 ; K vVehCoolFactor To calculate the coefficient 3, for example, 250.

[0083] Considering the cooling by thermal radiation, the numerical calculation of the temperature drop per unit time can be obtained by the following formula:

[0084] dTDisc2=(TDisc 4 -Tambient K 4 )*K_RadiationCoolFactor;

[0085] Among them, dTDisc2 represents the value of the thermal radiation temperature drop per unit time; TDisc represents the current brake disc temperature; Tambient K Indicates the ambient temperature; K_RadiationCoolFactor indicates the calculation factor 4, for example 5.2*10 -12 .

[0086] It should be noted that, considering the amount of rain attached to the brake disc, when the amount of rain is greater than a certain threshold, for example, greater than 10%, the calculation coefficient 5 is multiplied in the calculation process of the above dTDisc2, wherein the value of the calculation coefficient 5 is 1.1 for example.

[0087] It should be noted that the calculation coefficients 1, 2, 3, 4 and 5 mentioned above can all be empirical values, which are set according to actual conditions and are not limited in this embodiment. When the vehicle is just started, the current brake disc temperature is equal to the ambient temperature.

[0088] The current brake disc temperature is calculated according to the software operation cycle, which is generally 20ms or 5ms. The brake disc temperature of the first cycle is the ambient temperature, and then the brake disc temperature of the next cycle is calculated. The brake disc temperature of the next cycle is calculated according to the above formula, which is a continuous calculation process. Based on the initial brake disc temperature, the values ​​of the temperature rise per unit time are accumulated over time, and the values ​​of the temperature drop per unit time are accumulated over time, that is, the current actual brake disc temperature range is calculated.

[0089] Then, based on the brake disc temperature range and a preset brake disc temperature correction coefficient relationship, a second correction coefficient is determined;

[0090] In this embodiment, based on the calculation process of the brake disc temperature, the temperature range of the brake disc temperature during vehicle operation is determined, and based on the thermal characteristics of the brake disc, a specific braking performance correction coefficient, i.e., the second correction coefficient, is determined within a specific temperature range. The above-mentioned preset brake disc temperature correction coefficient relationship refers to the relationship between the brake disc temperature and the corresponding correction coefficient. The construction process can be to pre-set a specific, or rated, braking performance value for the brake disc, and then test the braking performance at different brake disc temperatures to obtain the braking performance at different temperatures; then, the braking performance at different temperatures is divided by the rated braking performance, and the correction coefficient corresponding to the brake disc temperature is obtained, and then the relationship between the brake disc temperature and the corresponding correction coefficient can be constructed. Accordingly, after obtaining the brake disc temperature range, the corresponding correction coefficient, i.e., the second correction coefficient, can be matched in the brake disc temperature correction coefficient relationship.

[0091] Accordingly, the method further comprises:

[0092] Based on the first correction coefficient and the second correction coefficient, the initial braking efficiency is corrected to obtain a new braking efficiency.

[0093] In this embodiment, the second correction coefficient is multiplied by the first correction coefficient and then acts on the initial braking efficiency originally stored in the controller, so as to correct the initial braking efficiency and obtain a new braking efficiency.

[0094] In the above implementation process, by considering the influence of rainfall on the braking performance, the brake disc temperature range is further obtained, and the second correction coefficient is determined based on the relationship between the brake disc temperature range and the preset brake disc temperature correction coefficient; based on the first correction coefficient and the second correction coefficient, the initial braking performance is corrected to obtain a new braking performance, thereby realizing the correction of the braking performance based on the rainfall and the brake disc temperature, so that the corrected braking performance is obtained by considering the change of the brake disc temperature and the influence of water stains on the brake disc, further improving the accuracy of the braking performance, and the corrected braking performance value will further optimize the performance of the active braking function of the braking control system, for example, for closed-loop control functions: automatic emergency braking, adaptive cruise control, correcting the braking performance value can optimize the closed-loop control and reduce the response time; for open-loop control functions: brake failure assistance, emergency brake assistance, etc., the correct braking performance can enable the braking system to establish an accurate target braking force. At the same time, based on the ambient temperature, driving speed and braking pressure, the brake disc temperature range estimated by the brake disc temperature estimation model is more accurate, further improving the accuracy of the braking performance.

[0095] It should be noted that the above-mentioned correction of the braking efficiency based on the brake disc temperature can also be used alone, that is, the initial braking efficiency is corrected based on the second correction coefficient to obtain a new braking efficiency to be suitable for different scenarios.

[0096] In some embodiments, when a vehicle is driving in rainy weather, the rain will cause water film on the brake disc, affecting the braking performance. After one brake, the disc contacts and the water film on the brake disc is wiped off, so there will be no water film affecting the braking performance, that is, the influence of rainfall is not considered. Therefore, it also includes:

[0097] First, after obtaining the new braking efficiency, it is determined whether the vehicle has completed a braking action;

[0098] Then, it is determined that a braking action is completed, and a new braking efficiency is recalculated based on the second correction coefficient and the initial braking efficiency.

[0099] In this embodiment, after the braking performance is corrected, after a braking action is performed, the influence of the correction coefficient determined by the rainfall should be eliminated, that is, the braking performance value should only be corrected by the correction coefficient determined by the brake disc temperature range. On the contrary, if a braking action is not completed, the new braking performance is still corrected based on the first correction coefficient and the second correction coefficient. It should be noted that the above braking action refers to the process in which the master cylinder pressure or the estimated wheel cylinder pressure reaches more than 2 hPa (bar), and the braking pressure is completely eliminated afterwards.

[0100] In the above implementation process, it is determined whether the vehicle has completed a braking action; and when it is determined that a braking action has been completed, a new braking efficiency is recalculated based on the second correction coefficient and the initial braking efficiency, so that when driving in rainy weather, the braking efficiency can be updated in time after completing a braking action, thereby further improving the accuracy of the braking efficiency, and thereby improving the accuracy of the performance of the active braking function of the braking control system.

[0101] Please see Figure 2 , Figure 2 The overall block diagram of the wheel braking efficiency correction according to the embodiment of the present application is schematically shown. The brake disc water volume can be obtained through the wiper gear and the timer, that is, the brake disc water volume is obtained. At the same time, the brake disc temperature range can be determined based on the brake pressure and the vehicle speed. The braking efficiency correction coefficient 1, that is, the first correction coefficient, can be obtained based on the brake disc water volume. The braking efficiency correction coefficient 2 can also be determined based on the brake disc temperature range and the brake disc water volume, that is, the correction coefficient obtained by multiplying the first correction coefficient by the second correction coefficient. Finally, the corrected braking efficiency can be obtained according to the braking efficiency correction coefficient 1 and the braking efficiency correction coefficient 2, respectively, wherein the corrected braking efficiency obtained according to the braking efficiency correction coefficient 1 is corrected by only considering the rainfall; the corrected braking efficiency obtained according to the braking efficiency correction coefficient 2 is corrected by considering the rainfall and the brake disc temperature.

[0102] Figure 1 FIG. 1 is a flow chart of the wheel braking efficiency correction method in the embodiment. It should be understood that although Figure 1 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figure 1 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0103] Please see Figure 3 , Figure 3 The structural block diagram of a wheel braking effectiveness correction device according to an embodiment of the present application is schematically shown. This embodiment provides a wheel braking effectiveness correction device, including a first acquisition module 410, a first determination module 420 and a correction module 430, wherein:

[0104] A first acquisition module 410 is used to acquire the amount of water in the brake disc;

[0105] A first determination module 420 is used to determine a first correction coefficient based on a preset water correction coefficient relationship and the brake disc water volume; wherein the preset water correction coefficient relationship is obtained by testing and calculating the vehicle braking performance under different rainfall conditions before the vehicle leaves the factory;

[0106] The correction module 430 is used to correct the initial braking efficiency based on the first correction coefficient to obtain a new braking efficiency.

[0107] Among them, it also includes:

[0108] A second acquisition module is used to acquire a brake disc temperature range;

[0109] a second determination module, configured to determine a second correction coefficient based on the brake disc temperature range and a preset brake disc temperature correction coefficient relationship;

[0110] The combined correction module is used to correct the initial braking efficiency based on the first correction coefficient and the second correction coefficient to obtain a new braking efficiency.

[0111] During the above implementation process, the amount of water on the brake disc is obtained through the first acquisition module 410; the first determination module 420 determines the first correction coefficient based on the preset water correction coefficient relationship and the amount of water on the brake disc; the correction module 430 corrects the initial braking efficiency based on the first correction coefficient to obtain a new braking efficiency. The wheel braking efficiency correction method fully considers the situation that water stains may be attached to the brake disc during driving in rainy days, and the water stains will cause the braking efficiency to decline, so that the corrected braking efficiency is more accurate. Furthermore, the corrected braking efficiency value will further optimize the performance of the active braking function of the braking control system. For example, for closed-loop control functions: automatic emergency braking, adaptive cruise control, correcting the braking efficiency value can optimize the closed-loop control and reduce the response time; for open-loop control functions: brake failure assist, emergency brake assist, etc., the correct braking efficiency can enable the braking system to establish an accurate target braking force.

[0112] The wheel braking effectiveness correction device includes a processor and a memory. The first loading module 410 and the second loading module 420 are stored in the memory as program units. The processor executes the program modules stored in the memory to implement corresponding functions.

[0113] The processor includes a kernel, which calls the corresponding program unit from the memory. One or more kernels can be set, and the interface startup can be accelerated by adjusting the kernel parameters.

[0114] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0115] An embodiment of the present invention provides a machine-readable storage medium on which a program is stored. When the program is executed by a processor, the wheel braking effectiveness correction method is implemented.

[0116] In one embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as follows: Figure 4 As shown. The computer device includes a processor A01, a network interface A02, a display screen A04, an input device A05 and a memory (not shown in the figure) connected through a system bus. Among them, the processor A01 of the computer device is used to provide computing and control capabilities. The memory of the computer device includes an internal memory A03 and a non-volatile storage medium A06. The non-volatile storage medium A06 stores an operating system B01 and a computer program B02. The internal memory A03 provides an environment for the operation of the operating system B01 and the computer program B02 in the non-volatile storage medium A06. The network interface A02 of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor A01, a wheel braking efficiency correction method is implemented. The display screen A04 of the computer device can be a liquid crystal display or an electronic ink display, and the input device A05 of the computer device can be a touch layer covered on the display screen, or a button, trackball or touchpad set on the computer device shell, or an external keyboard, touchpad or mouse.

[0117] Those skilled in the art will understand that Figure 4 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0118] In one embodiment, the wheel braking efficiency correction device provided by the present application can be implemented in the form of a computer program. The computer program can be Figure 4 The computer device shown in the figure is run on the computer device. The memory of the computer device can store various program modules constituting the wheel braking efficiency correction device, such as: Figure 3 The first acquisition module 410, the first determination module 420 and the correction module 430 are shown. The computer program composed of various program modules enables the processor to execute the steps of the wheel braking effectiveness correction method of each embodiment of the present application described in this specification.

[0119] Figure 4 The computer device shown can be Figure 3 The first acquisition module 410 in the wheel braking efficiency correction device shown executes step 210. The computer device may execute step 220 through the first determination module 420; the computer device may execute step 230 through the correction module 430;.

[0120] The embodiment of the present application provides an electronic device, which includes: at least one processor; a memory connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the at least one processor implements the above-mentioned wheel braking efficiency correction method by executing the instructions stored in the memory. When the processor executes the instructions, the following steps are implemented:

[0121] Get the brake disc water volume;

[0122] Determining a first correction coefficient based on a preset water volume correction coefficient relationship and the brake disc water volume;

[0123] Based on the first correction coefficient, the initial braking efficiency is corrected to obtain a new braking efficiency;

[0124] The preset water correction coefficient relationship is calculated by testing the vehicle's braking performance under different rainfall conditions before the vehicle leaves the factory.

[0125] In one embodiment, after determining the first correction coefficient, the method further includes:

[0126] Get the brake disc temperature range;

[0127] Determining a second correction coefficient based on the brake disc temperature range and a preset brake disc temperature correction coefficient relationship;

[0128] The method further comprises:

[0129] Based on the first correction coefficient and the second correction coefficient, the initial braking efficiency is corrected to obtain a new braking efficiency.

[0130] In one embodiment, obtaining the brake disc temperature range includes:

[0131] Obtain ambient temperature, vehicle speed and brake pressure;

[0132] Based on the ambient temperature, driving speed and brake pressure, a preset brake disc temperature estimation model is used to estimate the temperature range of the brake disc to obtain the brake disc temperature range.

[0133] In one embodiment, the temperature range of the brake disc is estimated based on the ambient temperature, the driving speed and the brake pressure using a preset brake disc temperature estimation model to obtain the brake disc temperature range, including:

[0134] Based on the ambient temperature, the driving speed and the brake pressure, respectively, a preset brake disc temperature estimation model is used to calculate a value of a temperature rise per unit time and a value of a temperature drop per unit time;

[0135] Based on the value of the temperature increase per unit time and the value of the temperature decrease per unit time, the brake disc temperature range is calculated.

[0136] In one embodiment, the method further comprises:

[0137] After obtaining the new braking efficiency, determining whether the vehicle has completed a braking action;

[0138] It is determined that a braking action is completed, and a new braking efficiency is recalculated based on the second correction coefficient and the initial braking efficiency.

[0139] In one embodiment, obtaining the amount of water in the brake disc includes:

[0140] Get the current rainfall level and the duration of the rainfall level;

[0141] The amount of water in the brake disc is obtained based on the current rainfall level and the duration of being in the current rainfall level.

[0142] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0143] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1A device that provides the functions specified in a block or multiple blocks.

[0144] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0145] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0146] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0147] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0148] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0149] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0150] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A wheel braking performance correction method, characterized in that: include: Get the brake disc water volume; Determining a first correction coefficient based on a preset water volume correction coefficient relationship and the brake disc water volume; Based on the first correction coefficient, the initial braking efficiency is corrected to obtain a new braking efficiency; The preset water correction coefficient relationship is calculated by testing the vehicle's braking performance under different rainfall conditions before the vehicle leaves the factory.

2. The wheel braking efficiency correction method according to claim 1, characterized in that: After the first correction coefficient is determined, the method further includes: Get the brake disc temperature range; Determining a second correction coefficient based on the brake disc temperature range and a preset brake disc temperature correction coefficient relationship; The method further comprises: Based on the first correction coefficient and the second correction coefficient, the initial braking efficiency is corrected to obtain a new braking efficiency.

3. The wheel braking efficiency correction method according to claim 2, characterized in that: The obtaining of the brake disc temperature range includes: Obtain ambient temperature, vehicle speed and brake pressure; Based on the ambient temperature, driving speed and brake pressure, a preset brake disc temperature estimation model is used to estimate the temperature range of the brake disc to obtain the brake disc temperature range.

4. The wheel braking efficiency correction method according to claim 3, characterized in that: The method of estimating the temperature range of the brake disc by using a preset brake disc temperature estimation model based on the ambient temperature, the driving speed and the brake pressure to obtain the brake disc temperature range includes: Based on the ambient temperature, the driving speed and the brake pressure, respectively, a preset brake disc temperature estimation model is used to calculate a value of a temperature rise per unit time and a value of a temperature drop per unit time; Based on the value of the temperature increase per unit time and the value of the temperature decrease per unit time, the brake disc temperature range is calculated.

5. The wheel braking efficiency correction method according to claim 2, characterized in that: The method further comprises: After obtaining the new braking efficiency, it is determined whether the vehicle has completed a braking action; It is determined that one braking action is completed, and a new braking efficiency is recalculated based on the second correction coefficient and the initial braking efficiency.

6. The wheel braking efficiency correction method according to claim 1, characterized in that: The obtaining of the brake disc water volume comprises: obtaining a current rainfall level and a duration of being in the current rainfall level; The amount of water in the brake disc is obtained based on the current rainfall level and the duration of being in the current rainfall level.

7. A wheel braking efficiency correction device, characterized in that: include: A first acquisition module is used to acquire the amount of water in the brake disc; A first determination module is used to determine a first correction coefficient based on a preset water correction coefficient relationship and the brake disc water volume; wherein the preset water correction coefficient relationship is obtained by testing and calculating the vehicle braking performance under different rainfall conditions before the vehicle leaves the factory; The correction module is used to correct the initial braking efficiency based on the first correction coefficient to obtain a new braking efficiency.

8. The wheel braking efficiency correction device according to claim 7, characterized in that: Also includes: A second acquisition module is used to acquire a brake disc temperature range; a second determination module, configured to determine a second correction coefficient based on the brake disc temperature range and a preset brake disc temperature correction coefficient relationship; The combined correction module is used to correct the initial braking efficiency based on the first correction coefficient and the second correction coefficient to obtain a new braking efficiency.

9. An electronic device, characterized in that: The electronic device includes: at least one processor; a memory connected to the at least one processor; The memory stores instructions that can be executed by the at least one processor, and the at least one processor implements the wheel braking efficiency correction method according to any one of claims 1 to 6 by executing the instructions stored in the memory.

10. A machine-readable storage medium having instructions stored thereon, characterized in that: When the instruction is executed by a processor, the processor is configured to execute the wheel braking effectiveness correction method according to any one of claims 1 to 6.

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