Vehicle brake disc temperature prediction method, device, electronic device and storage medium

Abstract

The present invention discloses a method, device, electronic device and storage medium for predicting the temperature of a vehicle brake disc, wherein the method comprises: dividing the brake disc into a friction ring part and a heat dissipation rib part based on a predetermined rule, wherein the friction ring part comprises: a plurality of friction ring microelements, and the heat dissipation rib part comprises: a plurality of heat dissipation rib microelements; obtaining the heat load-time relationship of the heat load of the brake disc changing with time during the vehicle braking process; based on the finite difference principle, determining the heat conduction power, convection heat dissipation power and radiation heat dissipation power of each microelement in the friction ring part and the heat dissipation rib part according to the physical parameters of the brake disc, the structural parameters of each microelement and the heat load-time relationship; based on the Jacobian matrix, predicting the temperature of the brake disc according to the heat conduction power, radiation heat dissipation power and convection heat dissipation power of each microelement. Through the present invention, the temperature of the brake disc can be predicted more accurately and efficiently.

Description

Technical Field

[0001] The present invention relates to the technical field of rail vehicles, and in particular to a method, device, electronic equipment and storage medium for predicting vehicle brake disc temperature. Background Art

[0002] The basic braking methods of existing rail vehicles mainly include tread braking and disc braking. Among them, disc braking can be divided into wheel-mounted brake discs and axle-mounted brake discs according to the difference in installation position. The pure air braking process of rail vehicles is the process of converting the vehicle's kinetic energy into thermal energy. When disc braking is used, the braking heat load is mainly borne by the brake disc. During the braking process, the disc temperature rises rapidly, and after the braking ends, the disc temperature gradually decreases. If the brake disc temperature exceeds the required range, it will cause damage to the brake disc structure and fasteners, affecting the safety of vehicle operation.

[0003] The existing brake disc temperature prediction is mainly achieved by the three-dimensional finite element method: (1) Discretize the brake disc structure into a finite number of three-dimensional units; (2) Input the vehicle operating conditions and brake thermal load into the model; (3) Obtain the equation based on the minimum potential energy principle and solve the temperature of each unit node; (4) Use the unit shape function to describe the temperature distribution inside each unit. At present, in the design stage of rail vehicles, this method has been well applied in the thermal capacity verification of wheel-mounted brake discs and axle-mounted brake discs.

[0004] However, the main disadvantages of the existing methods are low computational efficiency and high computational cost. In the optimization design of vehicle braking strategies, multiple iterations of braking control parameters are required, and each iteration requires predictive analysis of the brake disc temperature, requiring the brake disc temperature prediction method to have high computational efficiency. In the on-board brake disc health management system, computing resources are limited, requiring the brake disc temperature prediction method to be computationally economical. For the above brake disc temperature prediction requirements, the existing methods can no longer meet the actual needs. Summary of the invention

[0005] In view of this, the present invention provides a vehicle brake disc temperature prediction method, device, electronic device and storage medium to solve at least one of the above-mentioned problems.

[0006] According to a first aspect of the present invention, a method for predicting vehicle brake disc temperature is provided, the method comprising:

[0007] The brake disc is divided into a friction ring part and a heat dissipation rib part based on a predetermined rule, wherein the friction ring part includes: a plurality of friction ring microelements, and the heat dissipation rib part includes: a plurality of heat dissipation rib microelements;

[0008] Obtaining a thermal load-time relationship of the thermal load of the brake disc changing with time during vehicle braking;

[0009] Based on the finite difference principle, the heat conduction power, convection heat dissipation power and radiation heat dissipation power of each microelement in the friction ring part and the heat dissipation rib part are determined according to the physical parameters of the brake disc, the structural parameters of each microelement and the thermal load-time relationship;

[0010] Based on the Jacobian matrix, the brake disc temperature is predicted according to the heat conduction power, radiation heat dissipation power and convection heat dissipation power of each microelement.

[0011] According to a second aspect of the present invention, a vehicle brake disc temperature prediction device is provided, the device comprising:

[0012] A brake disc division unit, used for dividing the brake disc into a friction ring part and a heat dissipation rib part based on a predetermined rule, wherein the friction ring part includes: a plurality of friction ring microelements, and the heat dissipation rib part includes: a plurality of heat dissipation rib microelements;

[0013] A thermal load-time relationship acquisition unit, used for acquiring a thermal load-time relationship of the thermal load of the brake disc changing with time during vehicle braking;

[0014] A prediction information determination unit, configured to determine the heat conduction power, convection heat dissipation power and radiation heat dissipation power of each microelement in the friction ring part and the heat dissipation rib part based on the finite difference principle, according to the physical parameters of the brake disc, the structural parameters of each microelement and the thermal load-time relationship;

[0015] The prediction unit is used to predict the temperature of the brake disc based on the Jacobian matrix according to the heat conduction power, radiation heat dissipation power and convection heat dissipation power of each microelement.

[0016] According to a third aspect of the present invention, there is provided an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above method when executing the program.

[0017] According to a fourth aspect of the present invention, there is provided a computer-readable storage medium having a computer program stored thereon, wherein the computer program implements the steps of the above method when executed by a processor.

[0018] It can be seen from the above technical solution that the brake disc is divided into a friction ring part and a heat dissipation rib part containing multiple microelements, and the thermal load-time relationship of the brake disc during vehicle braking is obtained. Then, based on the finite difference principle, the thermal conduction power, convection heat dissipation power and radiation heat dissipation power of each microelement in the friction ring part and the heat dissipation rib part are determined according to the physical parameters of the brake disc, the structural parameters of each microelement and the thermal load-time relationship. Then, based on the Jacobian matrix, the brake disc temperature is predicted according to the thermal conduction power, radiation heat dissipation power and convection heat dissipation power of each microelement. This technical solution predicts the brake disc temperature by dividing the brake disc into multiple microelements and combining the thermal load-time relationship of the brake disc, the physical parameters and structural parameters of each microelement. Through the Jacobian matrix, the prediction time step can be automatically adjusted, so that the brake disc temperature can be predicted more accurately and efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is a flow chart of a method for predicting vehicle brake disc temperature according to an embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of the discreteness of a wheel-mounted brake disc along the thickness direction according to an embodiment of the present invention;

[0022] Figure 3 is a schematic diagram of the discreteness of the shaft-mounted brake disc along the thickness direction according to an embodiment of the present invention;

[0023] Figure 4 is a specific flow chart of vehicle brake disc temperature prediction according to an embodiment of the present invention;

[0024] Figure 5 It is a schematic diagram of the relationship between the vehicle running speed and the vehicle braking thermal load over time during two consecutive braking processes of the train;

[0025] Figure 6 It corresponds to Figure 5 Schematic diagram of the relationship between brake disc temperature and time;

[0026] Figure 7 is a structural block diagram of a vehicle brake disc temperature prediction device according to an embodiment of the present invention;

[0027] Figure 8 It is a schematic block diagram of the system structure of the electronic device 600 according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] At present, the prediction of brake disc temperature is mainly realized by three-dimensional finite element method, but this method has low computational efficiency and high computational cost. Based on this, an embodiment of the present invention provides a vehicle brake disc temperature prediction scheme, which can be applied to the temperature prediction of wheel-mounted brake discs and axle-mounted brake discs. The scheme predicts the brake disc temperature based on the finite difference principle, has high computational efficiency and low computational cost. The following is a detailed description of the embodiment of the present invention in conjunction with the accompanying drawings.

[0030] Figure 1 is a flow chart of a method for predicting vehicle brake disc temperature according to an embodiment of the present invention. Figure 1 As shown, the method includes:

[0031] Step 101 , dividing the brake disc into a friction ring part and a heat dissipation rib part based on a predetermined rule, wherein the friction ring part includes: a plurality of friction ring microelements, and the heat dissipation rib part includes: a plurality of heat dissipation rib microelements.

[0032] Step 102 , obtaining a thermal load-time relationship of the thermal load of the brake disc changing with time during the vehicle braking process.

[0033] Step 103, based on the finite difference principle, according to the physical parameters of the brake disc, the structural parameters of each microelement and the thermal load-time relationship, determine the thermal conduction power, convection heat dissipation power and radiation heat dissipation power of each microelement in the friction ring part and the heat dissipation rib part.

[0034] Specifically, the heat conduction power of each microelement can be determined in the following manner: the heat conduction power of each microelement is determined according to the physical parameters of the brake disc, the structural parameters of each microelement and the thermal load-time relationship, wherein the physical parameters include: the thermal conductivity coefficient, the ratio of the contact heat transfer from the wheel-mounted brake disc to the spoke to the ideal heat conduction, and the structural parameters are the cross-sectional area and thickness of the microelement.

[0035] Determining the convective heat dissipation power of each microelement specifically includes: determining the convective heat dissipation power of each microelement according to the physical parameters of the brake disc and the structural parameters of each microelement, wherein the physical parameters include: surface convective heat dissipation coefficient, and the structural parameters include: cross-sectional area, cross-sectional perimeter and thickness of the microelement.

[0036] Determining the radiation heat dissipation power of each microelement specifically includes: determining the radiation heat dissipation power of each microelement according to the physical parameters of the brake disc and the structural parameters of each microelement, wherein the physical parameters include: surface radiation emissivity, and the structural parameters include: cross-sectional area, cross-sectional perimeter and thickness of the microelement.

[0037] Step 104 : predicting the brake disc temperature based on the Jacobian matrix according to the heat conduction power, radiation heat dissipation power and convection heat dissipation power of each microelement.

[0038] Specifically, the temperature-time relationship of the brake disc temperature over time can be determined based on the heat conduction power, radiation heat dissipation power and convection heat dissipation power of each microelement; at the same time, based on the Jacobian matrix, the prediction time step is adjusted according to the running speed of the vehicle; then the brake disc temperature is predicted based on the temperature-time relationship and the prediction time step. Through the Jacobian matrix, the prediction time step can be adjusted based on the running speed of the vehicle, thereby improving the accuracy of the prediction result and improving the prediction efficiency.

[0039] It can be seen from the above description that the brake disc is divided into a friction ring part and a heat dissipation rib part including a plurality of microelements, and the thermal load-time relationship of the brake disc during vehicle braking is obtained. Then, based on the finite difference principle, the thermal conduction power, convection heat dissipation power and radiation heat dissipation power of each microelement in the friction ring part and the heat dissipation rib part are determined according to the physical parameters of the brake disc, the structural parameters of each microelement and the thermal load-time relationship. Then, based on the Jacobian matrix, the brake disc temperature is predicted according to the thermal conduction power, radiation heat dissipation power and convection heat dissipation power of each microelement. In an embodiment of the present invention, the brake disc is divided into a plurality of microelements, and the brake disc temperature is predicted in combination with the thermal load-time relationship of the brake disc, the physical parameters and structural parameters of each microelement. Through the Jacobian matrix, the prediction time step can be automatically adjusted, so that the brake disc temperature can be predicted more accurately and efficiently.

[0040] Specifically, for step 101, when the brake disc is a wheel-mounted brake disc, the wheel-mounted brake disc can be divided into a friction ring part and a heat dissipation rib part along the thickness direction, and the thickness of each microelement is the same.

[0041] Figure 2 This is a schematic diagram of the discretization of the wheel-mounted brake disc along the thickness direction, see Figure 2The wheel-mounted brake disc structure can be simplified into the friction ring part and the heat dissipation rib part, which can be discretized along the thickness direction as follows: Figure 2 The series of microelements shown in the figure can be represented by microelement numbers 1, 2…, i…, j,…N, where Q i,i+1 represents the heat conduction power flowing from the i-th microelement to the i+1-th unit, H i represents the convective heat dissipation power on the i-th infinitesimal element, R i Represents the radiation heat dissipation power of the i-th infinitesimal element.

[0042] For step 101, when the brake disc is a shaft-mounted brake disc, the shaft-mounted brake disc can be first divided into two symmetrical parts based on the symmetry characteristics of the shaft-mounted brake disc; then, one part of the shaft-mounted brake disc is divided into a friction ring part and a heat dissipation rib part along the thickness direction, and the thickness of each microelement is the same.

[0043] Figure 3 This is a schematic diagram of the discreteness of the shaft-mounted brake disc along the thickness direction, see Figure 3 The shaft-mounted brake disc includes two friction ring parts and a heat dissipation rib part, which can be discretely divided into the following along the thickness direction: Figure 3 As shown in FIG. 1 , the structure is symmetrical. In the embodiment of the present invention, the symmetric property is used to simplify the calculation, and only the following is analyzed: Figure 3 Portion to the left of the symmetrical cross section shown.

[0044] In actual operation, the embodiment of the present invention obtains the vehicle running speed and time relationship v=v(t) during the vehicle running process and the thermal load and time relationship Q during the vehicle braking process. 0 =Q 0 (t) (i.e., the above-mentioned thermal load-time relationship), the temperature prediction of the brake disc is realized based on the finite difference principle.

[0045] The following combination Figure 4 The specific process of vehicle brake disc temperature prediction is shown to describe the embodiment of the present invention in detail.

[0046] See also Figure 4 ,The specific process of vehicle brake disc temperature prediction includes:

[0047] Step 1: Generate the brake disc structural parameters required for calculation based on the brake disc type and size: friction ring cross-sectional area A 1 , friction ring cross-sectional circumference C 1 , friction ring thickness L 1 , heat dissipation rib cross-sectional area A 2 , heat dissipation rib cross-sectional perimeter C 2 And the thickness of the heat dissipation rib L 2 ,in:

[0048] Friction ring cross-sectional area A1 , used to describe the cross-sectional area of ​​the friction ring of the brake disc, unit: m 2 ;

[0049] Friction ring cross-section circumference C 1 , used to describe the circumference of the cross section of the friction ring of the brake disc, including the outer circumference of the friction ring and the inner circumference of the friction ring, unit: m;

[0050] Friction ring thickness L 1 , used to describe the thickness of the friction ring of the brake disc, unit: m;

[0051] Heat dissipation rib cross-sectional area A 2 , used to describe the cross-sectional area of ​​the brake disc cooling ribs, unit: m 2 ;

[0052] Heat dissipation rib cross-section perimeter C 2 , used to describe the circumference of the heat dissipation rib of the brake disc, unit: m;

[0053] Heat dissipation rib thickness L 2 , used to describe the thickness of the heat dissipation rib of the brake disc, unit: m.

[0054] Step 2: Obtain the brake disc physical parameters required for calculation: specific heat capacity C, thermal conductivity k, surface convection heat dissipation coefficient h, surface radiation emissivity ε, and brake disc material density ρ. These physical parameters can be quantities that change with the brake disc temperature or vehicle running speed.

[0055] The above-mentioned specific heat capacity C is used to describe the heat released or absorbed by the unit mass of the brake disc material and the unit temperature change, and the unit is J / (kg·K);

[0056] The thermal conductivity coefficient k is used to describe the thermal conductivity of the brake disc material along the unit length and unit temperature difference, with the unit of W / (m·K);

[0057] The surface convection heat dissipation coefficient h is used to describe the convection heat dissipation power of the brake disc material per unit surface area and unit temperature difference. The unit is W / (m 2 K);

[0058] The surface radiation emissivity ε is used to describe the ratio of the surface radiation power of the brake disc material to the radiation power of a black body at the same temperature, with the unit being 1.

[0059] The above-mentioned physical parameters of the brake disc can be constants or quantities that change with the temperature of the brake disc, and are given in the form of a curve or a list.

[0060] The above brake disc material density ρ is used to describe the mass per unit volume of the brake disc material, in kg / m 3 .

[0061] Step 3: Discretize the brake disc into N microelements along the thickness direction and initialize the column quantity T of the brake disc temperature.

[0062] Step 4: Obtain the vehicle speed vs. time relationship v=v(t) and the vehicle braking process thermal load vs. time relationship Q 0 =Q 0 (t).

[0063] Figure 5 It is a schematic diagram of the relationship between the vehicle running speed and the vehicle braking thermal load during two consecutive braking processes of the train. The relationship between the vehicle running speed and time v = v (t) and the relationship between the vehicle braking process thermal load and time Q 0 =Q 0 (t) is mainly used to calculate the temperature change of the brake disc during this process.

[0064] Figure 6 It corresponds to Figure 5 Schematic diagram of the relationship between brake disc temperature and time during two consecutive braking processes, where the "o" mark points are the results of each time step in the calculation process. During the vehicle braking process, the time step is smaller (that is, the "o" mark points are closer together), and during the vehicle acceleration process, the time step is larger (that is, the "o" mark points are sparser).

[0065] Step 5: For the time t and the brake disc temperature series T at this time, calculate the heat conduction power series Q, radiation heat dissipation power series R and convection heat dissipation power series H of each microelement of the brake disc.

[0066] Specifically, see Figure 2 and Figure 3 , for example Figure 2 The wheel-mounted brake disc shown in the figure is discretized into N microelements along the thickness direction, where the friction ring part is set to n 1 The heat dissipation rib part is set to n 2 For Figure 3 The shaft-mounted brake disc shown in the figure uses symmetry to simplify the analysis and discretizes its half-side structure into N microelements along the thickness direction, where the friction ring part is set to n 1 The heat dissipation rib part is set to n 2 The thickness of each element is set to Δx.

[0067] Assuming that the same brake disc microelement has the same temperature, use T i represents the temperature of the ith element, and the brake disc temperature is Ambient temperature T 0 .

[0068] (1) Calculation of heat conduction power Q:

[0069] Use Q i It represents the heat conduction power flowing from the i-th microelement to the i+1-th unit. The heat conduction power column is The column quantity has a total of N+1 elements.

[0070] The heat conduction power Q can be calculated by the following formula (1):

[0071]

[0072] In particular, Q 0 represents the heat conduction power flowing from the outside into the microelement No. 1, which is the heat load acting on the brake disc during vehicle braking and can be obtained through step 4; Q N represents the heat conduction power flowing from the Nth microelement to the outside. For the shaft-mounted brake disc, due to the symmetry of the model, Q N = 0. For wheel-mounted brake discs, it can be calculated using the following formula (2):

[0073]

[0074] Where η represents the ratio of contact heat transfer from the wheel-mounted brake disc to the spoke to ideal heat conduction.

[0075] (2) Calculation of radiation heat dissipation power R:

[0076] Using R i It represents the radiation heat dissipation power of the ith element. The radiation heat dissipation power is The column quantity has a total of N elements.

[0077] The radiation heat dissipation power can be calculated by the following formula (3):

[0078]

[0079] In the formula, ε 0 is the Boltzmann constant, which can be taken as 5.67×10 -8 W / (m 2 ×K 4 ).

[0080] (3) Calculation of convective heat transfer power H:

[0081] Use H i represents the convective heat dissipation power on the i-th infinitesimal element, and the convective heat transfer power is The column quantity has a total of N elements.

[0082] The convective heat dissipation power can be calculated by the following formula (4):

[0083]

[0084] Step 6: Calculate the rate of change dT / dt of the temperature column T with time and the Jacobian matrix J of the temperature column.

[0085] Specifically, the calculation of the time change rate of the brake disc temperature column T is:

[0086] use It represents the rate of change of the temperature of the ith element over time. The rate of change of the temperature of the brake disc over time is

[0087] The temperature column variable rate of change over time can be calculated by the following formula (5):

[0088]

[0089] The calculation of the Jacobian matrix J of the temperature column of the brake disc is:

[0090] The above equation can be simply written as Where t is time and T is temperature. This equation is called an ordinary differential equation in mathematics. The equation can be solved using an ordinary differential equation solver based on the Runge-Kutta method, such as ode45 provided by Matlab, RADAU written based on Fortran, etc. In the actual calculation and analysis process, the braking process of the vehicle is accompanied by the input of braking heat load. The physical quantities in the equation, such as the heat conduction power column Q, the convection heat transfer power column H, and the radiation heat dissipation power column R, change dramatically over time. During the normal operation of the vehicle, there is no braking heat load input, and the physical quantities in the calculation change slowly. For details, please refer to Figure 5 and Figure 6 The Jacobian matrix J of the temperature column is used to calculate and adjust the integration time step in the ordinary differential equation solver to improve the calculation efficiency. The matrix is ​​defined as follows:

[0091]

[0092] In program design, in order to simplify the derivation of formulas, a numerical method is used to calculate the Jacobian matrix, as shown in the following formula (6):

[0093] remember

[0094]

[0095] In the formula, To impose a small temperature disturbance ΔT on the temperature column in item i, f j For the equation The jth item of .

[0096] Step 7: Input the assembled equation into the ordinary differential equation solver, integrate and solve the equation, and update the time t and the brake disc temperature column T at this time.

[0097] Step 8: When the calculation reaches the preset end time, the calculation stops and the time, vehicle speed, braking process heat load and brake disc temperature are output in the form of columns for use by other programs.

[0098] From the above description, it can be seen that the embodiment of the present invention is based on the relationship between the vehicle running speed and time v=v(t) and the relationship between the thermal load of the vehicle during braking and time Q 0 =Q 0 (t), constructs physical equations based on the finite difference principle and the heat conduction, radiation heat dissipation and convection heat dissipation processes of the brake disc, and automatically adjusts the calculation time increment step through the Jacobian matrix. It has the advantages of accurate prediction results and high calculation efficiency, and is suitable for rapid temperature prediction of axle-mounted brake discs and wheel-mounted brake discs. In addition, the embodiment of the present invention has low calculation cost and is also suitable for vehicle-mounted temperature prediction of axle-mounted brake discs and wheel-mounted brake discs.

[0099] Based on similar inventive concepts, an embodiment of the present invention further provides a vehicle brake disc temperature prediction device, which can preferably be used to implement the above method embodiment.

[0100] Figure 7 It is a structural block diagram of a vehicle brake disc temperature prediction device, such as Figure 7 As shown, the device comprises: a brake disc dividing unit 1, a thermal load-time relationship acquiring unit 2, a prediction information determining unit 3 and a prediction unit 4, wherein:

[0101] The brake disc division unit 1 is used to divide the brake disc into a friction ring part and a heat dissipation rib part based on a predetermined rule, wherein the friction ring part includes: a plurality of friction ring microelements, and the heat dissipation rib part includes: a plurality of heat dissipation rib microelements;

[0102] A thermal load-time relationship acquisition unit 2, used for acquiring a thermal load-time relationship of the thermal load of the brake disc changing with time during the vehicle braking process;

[0103] The prediction information determination unit 3 is used to determine the heat conduction power, convection heat dissipation power and radiation heat dissipation power of each microelement in the friction ring part and the heat dissipation rib part based on the finite difference principle according to the physical parameters of the brake disc, the structural parameters of each microelement and the thermal load-time relationship;

[0104] The prediction unit 4 is used to predict the brake disc temperature based on the Jacobian matrix according to the heat conduction power, radiation heat dissipation power and convection heat dissipation power of each microelement.

[0105] As can be seen from the above description, the brake disc is divided into a friction ring part and a heat dissipation rib part including a plurality of microelements by the brake disc division unit 1, and the thermal load-time relationship acquisition unit 2 acquires the thermal load-time relationship of the brake disc during the vehicle braking process. Subsequently, the prediction information determination unit 3 determines the thermal conduction power, convection heat dissipation power and radiation heat dissipation power of each microelement in the friction ring part and the heat dissipation rib part based on the finite difference principle according to the physical parameters of the brake disc, the structural parameters of each microelement and the thermal load-time relationship. Then, the prediction unit 4 predicts the brake disc temperature based on the Jacobian matrix according to the thermal conduction power, radiation heat dissipation power and convection heat dissipation power of each microelement. In the embodiment of the present invention, the brake disc is divided into a plurality of microelements, and the brake disc temperature is predicted in combination with the thermal load-time relationship of the brake disc, the physical parameters and the structural parameters of each microelement. Through the Jacobian matrix, the prediction time step can be automatically adjusted, so that the brake disc temperature can be predicted more accurately and efficiently.

[0106] Specifically, when the brake disc is a wheel-mounted brake disc, the brake disc dividing unit 1 is specifically used to divide the wheel-mounted brake disc into a friction ring part and a heat dissipation rib part along the thickness direction.

[0107] When the brake disc is a shaft-mounted brake disc, the brake disc dividing unit 1 specifically comprises: a first dividing module and a second dividing module, wherein:

[0108] A first dividing module, configured to divide the shaft-mounted brake disc into two symmetrical parts based on the symmetric characteristics of the shaft-mounted brake disc;

[0109] The second dividing module is used to divide a portion of the shaft-mounted brake disc into a friction ring portion and a heat dissipation rib portion along the thickness direction.

[0110] In the specific implementation process, the prediction information determination unit 3 includes: a heat conduction power determination module, which is used to determine the heat conduction power of each microelement in the following manner:

[0111] The heat conduction power of each microelement is determined according to the physical parameters of the brake disc, the structural parameters of each microelement and the thermal load-time relationship, wherein the physical parameters include: thermal conductivity, the ratio of contact heat transfer from the wheel-mounted brake disc to the spoke to ideal heat conduction, and the structural parameters are the cross-sectional area and thickness of the microelement.

[0112] The prediction information determination unit 3 further includes: a convection heat dissipation power determination module, which is used to determine the convection heat dissipation power of each micro-element in the following manner:

[0113] The convection heat dissipation power of each microelement is determined according to the physical parameters of the brake disc and the structural parameters of each microelement, wherein the physical parameters include: surface convection heat dissipation coefficient, and the structural parameters include: cross-sectional area, cross-sectional perimeter and thickness of the microelement.

[0114] The prediction information determination unit 3 further includes: a radiation heat dissipation power determination module, which is used to determine the radiation heat dissipation power of each microelement in the following manner:

[0115] The radiation heat dissipation power of each microelement is determined according to the physical parameters of the brake disc and the structural parameters of each microelement, wherein the physical parameters include: surface radiation emissivity, and the structural parameters include: cross-sectional area, cross-sectional perimeter and thickness of the microelement.

[0116] The above-mentioned prediction unit 4 includes: a temperature-time relationship determination module, a prediction time step adjustment module and a prediction module, wherein:

[0117] A temperature-time relationship determination module, used for determining a temperature-time relationship of a brake disc temperature changing with time according to the heat conduction power, radiation heat dissipation power and convection heat dissipation power of each microelement;

[0118] A prediction time step adjustment module, used for adjusting the prediction time step according to the running speed of the vehicle based on the Jacobian matrix;

[0119] A prediction module is used to predict the brake disc temperature according to the temperature-time relationship and the prediction time step.

[0120] The specific execution process of the above-mentioned units and modules can be found in the description of the above-mentioned method embodiment, which will not be repeated here.

[0121] In actual operation, the above-mentioned units and modules may be provided in combination or individually, and the present invention is not limited thereto.

[0122] This embodiment also provides an electronic device, which may be a desktop computer, a tablet computer, a mobile terminal, etc., but this embodiment is not limited thereto. In this embodiment, the electronic device may be implemented with reference to the above method embodiment and the embodiment of the vehicle brake disc temperature prediction device, the contents of which are incorporated herein, and the repeated parts are not repeated.

[0123] Figure 8 FIG. 6 is a schematic block diagram of a system structure of an electronic device 600 according to an embodiment of the present invention. Figure 8 As shown, the electronic device 600 may include a central processor 100 and a memory 140; the memory 140 is coupled to the central processor 100. It should be noted that this figure is exemplary; other types of structures may also be used to supplement or replace this structure to implement telecommunication functions or other functions.

[0124] In one embodiment, the vehicle brake disc temperature prediction function may be integrated into the central processor 100. The central processor 100 may be configured to perform the following control:

[0125] The brake disc is divided into a friction ring part and a heat dissipation rib part based on a predetermined rule, wherein the friction ring part includes: a plurality of friction ring microelements, and the heat dissipation rib part includes: a plurality of heat dissipation rib microelements;

[0126] Obtaining a thermal load-time relationship of the thermal load of the brake disc changing with time during vehicle braking;

[0127] Based on the finite difference principle, the heat conduction power, convection heat dissipation power and radiation heat dissipation power of each microelement in the friction ring part and the heat dissipation rib part are determined according to the physical parameters of the brake disc, the structural parameters of each microelement and the thermal load-time relationship;

[0128] Based on the Jacobian matrix, the brake disc temperature is predicted according to the heat conduction power, radiation heat dissipation power and convection heat dissipation power of each microelement.

[0129] From the above description, it can be seen that the electronic device provided in the embodiment of the present application divides the brake disc into a friction ring part and a heat dissipation rib part including multiple microelements, and obtains the thermal load-time relationship of the brake disc during vehicle braking. Then, based on the finite difference principle, the thermal conduction power, convection heat dissipation power and radiation heat dissipation power of each microelement in the friction ring part and the heat dissipation rib part are determined according to the physical parameters of the brake disc, the structural parameters of each microelement and the thermal load-time relationship. Then, based on the Jacobian matrix, the brake disc temperature is predicted according to the thermal conduction power, radiation heat dissipation power and convection heat dissipation power of each microelement. The embodiment of the present invention divides the brake disc into multiple microelements, and predicts the brake disc temperature in combination with the thermal load-time relationship of the brake disc, the physical parameters and structural parameters of each microelement. Through the Jacobian matrix, the prediction time step can be automatically adjusted, so that the brake disc temperature can be predicted more accurately and efficiently.

[0130] In another embodiment, the vehicle brake disc temperature prediction device can be configured separately from the central processing unit 100. For example, the vehicle brake disc temperature prediction device can be configured as a chip connected to the central processing unit 100, and the vehicle brake disc temperature prediction function can be realized through the control of the central processing unit.

[0131] like Figure 8 As shown, the electronic device 600 may further include: a communication module 110, an input unit 120, an audio processing unit 130, a display 160, and a power supply 170. It is worth noting that the electronic device 600 does not necessarily have to include Figure 8In addition, the electronic device 600 may also include Figure 8 For components not shown, reference may be made to the prior art.

[0132] like Figure 8 As shown, the central processor 100 is sometimes also referred to as a controller or an operation control, and may include a microprocessor or other processor devices and / or logic devices. The central processor 100 receives inputs and controls the operations of various components of the electronic device 600.

[0133] The memory 140 may be, for example, one or more of a cache, a flash memory, a hard drive, a removable medium, a volatile memory, a non-volatile memory or other suitable devices. The above-mentioned information related to the failure may be stored, and a program for executing the relevant information may also be stored. The CPU 100 may execute the program stored in the memory 140 to implement information storage or processing.

[0134] The input unit 120 provides input to the CPU 100. The input unit 120 is, for example, a key or a touch input device. The power supply 170 is used to provide power to the electronic device 600. The display 160 is used to display display objects such as images and text. The display may be, for example, an LCD display, but is not limited thereto.

[0135] The memory 140 may be a solid-state memory, such as a read-only memory (ROM), a random access memory (RAM), a SIM card, etc. It may also be a memory that saves information even when the power is off, can be selectively erased, and is provided with more data, examples of which are sometimes referred to as EPROMs, etc. The memory 140 may also be some other type of device. The memory 140 includes a buffer memory 141 (sometimes referred to as a buffer). The memory 140 may include an application / function storage unit 142, which is used to store application programs and function programs or processes for executing the operation of the electronic device 600 through the central processor 100.

[0136] The memory 140 may also include a data storage unit 143 for storing data, such as contacts, digital data, pictures, sounds, and / or any other data used by the electronic device. The driver storage unit 144 of the memory 140 may include various drivers for communication functions of the electronic device and / or for executing other functions of the electronic device (such as messaging applications, address book applications, etc.).

[0137] The communication module 110 is a transmitter / receiver 110 that transmits and receives signals via an antenna 111. The communication module (transmitter / receiver) 110 is coupled to the central processor 100 to provide input signals and receive output signals, which may be the same as the case of a conventional mobile communication terminal.

[0138] Based on different communication technologies, multiple communication modules 110 may be provided in the same electronic device, such as a cellular network module, a Bluetooth module and / or a wireless LAN module. The communication module (transmitter / receiver) 110 is also coupled to a speaker 131 and a microphone 132 via an audio processor 130 to provide an audio output via the speaker 131 and receive an audio input from the microphone 132, thereby realizing a common telecommunication function. The audio processor 130 may include any suitable buffer, decoder, amplifier, etc. In addition, the audio processor 130 is also coupled to the central processor 100, so that the sound can be recorded on the local machine through the microphone 132, and the sound stored on the local machine can be played through the speaker 131.

[0139] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the above-mentioned vehicle brake disc temperature prediction method are implemented.

[0140] In summary, the embodiment of the present invention is based on the relationship between the vehicle running speed and time v=v(t) and the relationship between the thermal load of the vehicle during braking and time Q 0 =Q 0 (t), based on the finite difference principle and the heat conduction, radiation heat dissipation and convection heat dissipation processes of the brake disc, the physical equation can be constructed, and the calculation time increment step can be automatically adjusted. It has the advantages of accurate calculation results and high calculation efficiency, and is suitable for rapid temperature prediction of axle-mounted brake discs and wheel-mounted brake discs. In addition, the embodiment of the present invention has low calculation cost and is also suitable for vehicle-mounted temperature prediction of axle-mounted brake discs and wheel-mounted brake discs.

[0141] The preferred embodiments of the present invention are described above with reference to the accompanying drawings. Many features and advantages of these embodiments are clear from this detailed description, and therefore the claims are intended to cover all such features and advantages of these embodiments that fall within their true spirit and scope. In addition, since many modifications and changes are easily conceivable to those skilled in the art, it is not intended to limit the embodiments of the present invention to the precise structure and operation illustrated and described, but all suitable modifications and equivalents falling within its scope may be covered.

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

[0143] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks 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 produce 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 1 A 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] The present invention uses specific embodiments to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A method for predicting vehicle brake disc temperature, characterized in that: The method comprises: The brake disc is divided into a friction ring part and a heat dissipation rib part based on a predetermined rule, wherein the friction ring part includes: a plurality of friction ring microelements, and the heat dissipation rib part includes: a plurality of heat dissipation rib microelements; Obtaining a thermal load-time relationship of the thermal load of the brake disc changing with time during vehicle braking; Based on the finite difference principle, the heat conduction power, convection heat dissipation power and radiation heat dissipation power of each microelement in the friction ring part and the heat dissipation rib part are determined according to the physical parameters of the brake disc, the structural parameters of each microelement and the thermal load-time relationship; Based on the Jacobian matrix, the brake disc temperature is predicted according to the heat conduction power, radiation heat dissipation power and convection heat dissipation power of each microelement. Wherein, when the brake disc is a wheel-mounted brake disc, dividing the brake disc into a friction ring portion and a heat dissipation rib portion based on a predetermined rule comprises: dividing the wheel-mounted brake disc into a friction ring portion and a heat dissipation rib portion along a thickness direction; When the brake disc is a shaft-mounted brake disc, dividing the brake disc into a friction ring part and a heat dissipation rib part based on a predetermined rule includes: dividing the shaft-mounted brake disc into two symmetrical parts based on the symmetry characteristics of the shaft-mounted brake disc; dividing a part of the shaft-mounted brake disc into a friction ring part and a heat dissipation rib part along the thickness direction.

2. The method according to claim 1, characterized in that The heat conduction power of each microelement is determined as follows: The heat conduction power of each microelement is determined according to the physical parameters of the brake disc, the structural parameters of each microelement and the thermal load-time relationship, wherein the physical parameters include: thermal conductivity, the ratio of contact heat transfer from the wheel-mounted brake disc to the spoke to ideal heat conduction, and the structural parameters are the cross-sectional area and thickness of the microelement.

3. The method according to claim 1, characterized in that The convective heat dissipation power of each microelement is determined as follows: The convection heat dissipation power of each microelement is determined according to the physical parameters of the brake disc and the structural parameters of each microelement, wherein the physical parameters include: surface convection heat dissipation coefficient, and the structural parameters include: cross-sectional area, cross-sectional perimeter and thickness of the microelement.

4. The method according to claim 1, characterized in that The radiation heat dissipation power of each microelement is determined as follows: The radiation heat dissipation power of each microelement is determined according to the physical parameters of the brake disc and the structural parameters of each microelement, wherein the physical parameters include: surface radiation emissivity, and the structural parameters include: cross-sectional area, cross-sectional perimeter and thickness of the microelement.

5. The method according to claim 1, characterized in that: Based on the Jacobian matrix, predicting the brake disc temperature according to the heat conduction power, radiation heat dissipation power and convection heat dissipation power of each microelement includes: Determine the temperature-time relationship of the brake disc temperature over time according to the heat conduction power, radiation heat dissipation power and convection heat dissipation power of each microelement; Based on the Jacobian matrix, adjusting the prediction time step according to the running speed of the vehicle; The brake disc temperature is predicted according to the temperature-time relationship and the prediction time step.

6. A vehicle brake disc temperature prediction device, characterized in that: The device comprises: A brake disc division unit, used for dividing the brake disc into a friction ring part and a heat dissipation rib part based on a predetermined rule, wherein the friction ring part includes: a plurality of friction ring microelements, and the heat dissipation rib part includes: a plurality of heat dissipation rib microelements; A thermal load-time relationship acquisition unit, used for acquiring a thermal load-time relationship of the thermal load of the brake disc changing with time during vehicle braking; A prediction information determination unit, configured to determine the heat conduction power, convection heat dissipation power and radiation heat dissipation power of each microelement in the friction ring part and the heat dissipation rib part based on the finite difference principle, according to the physical parameters of the brake disc, the structural parameters of each microelement and the thermal load-time relationship; A prediction unit, configured to predict the temperature of the brake disc according to the heat conduction power, radiation heat dissipation power and convection heat dissipation power of each microelement based on a Jacobian matrix; Wherein, when the brake disc is a wheel-mounted brake disc, the brake disc dividing unit is specifically used to: divide the wheel-mounted brake disc into a friction ring part and a heat dissipation rib part along the thickness direction; When the brake disc is a shaft-mounted brake disc, the brake disc dividing unit includes: a first dividing module, used to divide the shaft-mounted brake disc into two symmetrical parts based on the symmetry characteristics of the shaft-mounted brake disc; and a second dividing module, used to divide a part of the shaft-mounted brake disc into a friction ring part and a heat dissipation rib part along the thickness direction.

7. The device according to claim 6, characterized in that The prediction information determination unit includes: a heat conduction power determination module, which is used to determine the heat conduction power of each microelement in the following manner: The heat conduction power of each microelement is determined according to the physical parameters of the brake disc, the structural parameters of each microelement and the thermal load-time relationship, wherein the physical parameters include: thermal conductivity, the ratio of contact heat transfer from the wheel-mounted brake disc to the spoke to ideal heat conduction, and the structural parameters are the cross-sectional area and thickness of the microelement.

8. The device according to claim 6, characterized in that The prediction information determination unit includes: a convection heat dissipation power determination module, which is used to determine the convection heat dissipation power of each micro-element in the following manner: The convection heat dissipation power of each microelement is determined according to the physical parameters of the brake disc and the structural parameters of each microelement, wherein the physical parameters include: surface convection heat dissipation coefficient, and the structural parameters include: cross-sectional area, cross-sectional perimeter and thickness of the microelement.

9. The device according to claim 6, characterized in that The prediction information determination unit includes: a radiation heat dissipation power determination module, which is used to determine the radiation heat dissipation power of each micro-element in the following manner: The radiation heat dissipation power of each microelement is determined according to the physical parameters of the brake disc and the structural parameters of each microelement, wherein the physical parameters include: surface radiation emissivity, and the structural parameters include: cross-sectional area, cross-sectional perimeter and thickness of the microelement.

10. The device according to claim 6, characterized in that The prediction unit comprises: A temperature-time relationship determination module, used for determining a temperature-time relationship of a brake disc temperature changing with time according to the heat conduction power, radiation heat dissipation power and convection heat dissipation power of each microelement; A prediction time step adjustment module, used for adjusting the prediction time step according to the running speed of the vehicle based on the Jacobian matrix; A prediction module is used to predict the brake disc temperature according to the temperature-time relationship and the prediction time step.

11. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the method according to any one of claims 1 to 5 are implemented.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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