A method, medium, and system for controlling sand spreading on rail transit vehicles

Abstract

This invention discloses a method, medium, and system for controlling sand application on rail transit vehicles. The method includes the following steps: acquiring the vehicle's operating parameters during idle coasting and determining whether sand application is needed based on these parameters; when sand application is needed, assessing whether the current traction force meets the subsequent vehicle operation requirements by combining the vehicle's operating parameters and track information; if it does, sand application is unnecessary; if it does not, sand application is initiated. This invention determines the necessity of sand application based on adhesion control sand application requirements and train automatic driving information, with the aim of meeting the train line operation requirements; if sand application is deemed necessary, the amount of sand applied is adjusted in real time based on the line operation requirements and the actual traction / braking force performance, achieving the goals of saving sand, using sand efficiently, and extending the necessary sand application time.

Description

Technical Field

[0001] This invention mainly relates to the field of rail transit technology, specifically to a method, medium, and system for controlling sand spreading on rail transit vehicles. Background Technology

[0002] When the rail surface is exposed to natural weather conditions such as rain or snow, or when there are foreign objects on its surface, the adhesion coefficient of the rail surface or road surface decreases, and the vehicle is prone to wheel spin during operation. The problem that adhesion control in the rail transit field needs to solve is to quickly suppress wheel spin when wheel spin occurs, so as to avoid damage to the wheel and rail and ensure vehicle power.

[0003] Adhesion control, achieved through software-based adjustment of traction / braking forces, aims to suppress wheelset slippage while ensuring that traction / braking forces are applied near the optimal adhesion point. To enhance traction / braking performance while suppressing wheelset slippage, improving wheel-rail adhesion characteristics through physical means is both necessary and highly effective. Common methods for improving wheel-rail adhesion include sanding, tread cleaning, and rail surface cleaning.

[0004] For most locomotives, sand application is currently the only effective way to improve wheel-rail adhesion. When wheel-rail adhesion is poor and the locomotive requires significant traction and braking force, the wheel-rail adhesion cannot meet the actual needs, leading to wheel spin and slippage accompanied by sand application. While sand application can improve wheel-rail adhesion, the large amount of sand used and the difficulty in adding sand during locomotive operation can also impact daily operation, taking up maintenance time and increasing operating costs.

[0005] In conventional sand-spreading control, the conditions that trigger sand-spreading during wheel spin are generally as follows:

[0006] 1. The actual traction / braking force is lower than the set traction and braking force by a certain percentage;

[0007] 2. The acceleration / deceleration or creep speed of the wheelset exceeds the set threshold.

[0008] The above conditions are applied in combination and / or as a form of sand control. This conventional sand control aims to suppress wheelset slippage, improve wheel-rail adhesion, and increase the upper limit of traction performance.

[0009] In practical applications, due to the limited capacity of the sand box, for vehicles that are used outdoors for a long time, if they encounter rain or snow, the rail surface will be in a slippery state over a large area. The vehicle will be in a low adhesion state during operation, resulting in continuous sand application and serious sand consumption. It is easy to run out of sand midway, which means that the wheel-rail conditions cannot be effectively improved when there is no sand. The upper limit of traction / braking force is limited by the wheel-rail adhesion conditions, affecting the use of the vehicle. Summary of the Invention

[0010] To address the technical problems existing in the prior art, this invention provides a sand-spreading control method, medium, and system for rail transit vehicles that saves sand and uses sand efficiently.

[0011] To solve the above-mentioned technical problems, the technical solution proposed by this invention is as follows:

[0012] A method for controlling sand spreading on rail transit vehicles, comprising the following steps:

[0013] Obtain the vehicle's operating parameters when it is coasting, and determine whether sand spreading is needed based on the operating parameters;

[0014] When there is a need for sand spreading, the current traction performance is assessed based on the vehicle's operating parameters and route information to determine if it meets the subsequent vehicle operation requirements. If it does, sand spreading is not necessary; if it does not, sand spreading is initiated.

[0015] Preferably, when there is a need for sand spreading, the specific process of assessing whether the current traction performance meets the subsequent vehicle operation requirements, in conjunction with the vehicle's operating parameters and route information, is as follows:

[0016] The vehicle's operating parameters include the required traction force F1, the actual traction force F2, and the locomotive speed v; the track information includes the track resistance F. R ;

[0017] Based on a comprehensive analysis of the sand spreading demand u, the required traction force F1, the actual traction force F2, and the locomotive speed v, the analysis results are obtained.

[0018] The decision to activate sand spreading is based on the analysis results.

[0019] Preferably, the specific process for obtaining the analysis results by comprehensively analyzing the sand spreading demand u, the required traction force F1, the actual traction force F2, and the locomotive speed v is as follows:

[0020] The sand spreading demand u, the required traction force F1, the actual traction force F2, and the locomotive speed v are processed according to fuzzy rules to obtain the analysis result κ.

[0021] Where κ=f(u,F1,F2,F) R ,v).

[0022] Preferably, the specific process for determining whether to activate sand spreading based on the analysis results is as follows:

[0023] Sand spreading is disabled when 0 ≤ κ ≤ κ1; where κ1 is a preset value.

[0024] When κ1 < κ ≤ 1, sand spreading is activated.

[0025] Preferably, the amount of sand applied is automatically adjusted based on the analysis result κ; where the larger κ is, the larger the amount of sand applied; and the smaller κ is, the smaller the amount of sand applied.

[0026] Preferably, the sand spreading time is adjusted according to the analysis result κ to automatically adjust the sand spreading amount; where the larger κ is, the larger t1 / T is; the smaller κ is, the smaller t1 / T is; where t1 is the sand spreading start time; T is the sand spreading cycle, including the sand spreading start time t1 and the sand spreading stop time t2, that is, T=t1+t2.

[0027] Preferably, when determining whether there is a need for sand spreading based on operating parameters, the corresponding operating parameters include the actual traction / braking force and the set traction / braking force.

[0028] The present invention also discloses a computer program product, comprising a computer program that, when executed by a processor, performs the steps of the method described above.

[0029] The present invention further discloses a computer-readable storage medium having a computer program stored thereon, the computer program executing the steps of the method described above when run by a processor.

[0030] The present invention also discloses a sand spreading control system for rail transit vehicles, including a memory and a processor connected to each other, wherein the memory stores a computer program, and the computer program executes the steps of the method described above when run by the processor.

[0031] Compared with the prior art, the advantages of the present invention are as follows:

[0032] This invention acquires train route information (including current and subsequent route conditions), real-time train speed, set and actual traction force, and adhesion sanding requirements. Based on the train's traction performance, actual speed, and route conditions, it performs real-time sanding control. According to the adhesion control sanding requirements, combined with train automatic driving information, and with the aim of meeting the train's route operation needs, it determines whether sanding is necessary. If sanding is deemed necessary, it adjusts the sanding amount in real-time based on route operation requirements and actual traction / braking force performance, achieving the goals of saving sand, using sand efficiently, and extending the necessary sanding time. Attached Figure Description

[0033] Figure 1 This is a diagram illustrating an embodiment of the sand-spreading control system of the present invention in a specific application.

[0034] Figure 2 This is a flowchart of an embodiment of the sand-spreading control method of the present invention. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0036] like Figure 2 As shown, the sand-spreading control method for rail transit vehicles according to an embodiment of the present invention includes the following steps:

[0037] 1) Obtain the vehicle's operating parameters when it is coasting, and determine whether sand spreading is required based on the operating parameters;

[0038] 2) When there is a need for sand spreading, assess whether the current traction performance meets the subsequent vehicle operation requirements by combining the vehicle's operating parameters and route information; if it does, there is no need to start sand spreading; if it does not, then start sand spreading.

[0039] In step 2), when sand spreading is required, the following factors are considered: track information, current vehicle operating conditions, and the estimated subsequent vehicle operating conditions based on the current traction performance. If the current vehicle operating conditions meet the subsequent operating requirements, sand spreading is unnecessary. If the assessment indicates that the current traction performance cannot meet the subsequent vehicle operating requirements, sand spreading is initiated to improve wheel-rail adhesion and enhance traction performance. The necessity of sand spreading needs to comprehensively consider the following factors:

[0040] 1. The current set traction force and the actual traction force exerted;

[0041] 2. Based on the subsequent track conditions and locomotive operation requirements, is there a need for significant traction for an extended period of time?

[0042] 3. Based on the current traction capacity, estimate whether the locomotive speed changes in the future will be able to meet operational requirements.

[0043] After comprehensively evaluating the above factors, a judgment is made on whether to start sand spreading, and the decision is made accordingly.

[0044] Specifically, considering the adhesion sanding requirement u (u=1: indicating that there is a sanding requirement for adhesion, otherwise indicating that there is no sanding requirement for adhesion), traction requirement F1, actual traction force utilization F2, track information, and train formation information M, the corresponding track resistance F is calculated according to the traction regulations. R The analysis results are obtained by processing comprehensive information such as the subsequent locomotive speed v according to fuzzy rules:

[0045] κ=f(u,F1,F2,F R ,v)

[0046] Among them, the actual traction force F2 and the line resistance F are used. RCalculate and predict subsequent locomotive speed changes; then, based on the locomotive speed changes, predict the subsequent locomotive traction demand F1 changes, and combine this with the adhesive sanding demand u to comprehensively determine whether sanding is necessary.

[0047] Specifically, the determination of whether sand needs to be added is based on the analysis result κ.

[0048] Sand spreading is disabled when 0 ≤ κ ≤ κ1; where κ1 is a preset value.

[0049] When κ1 < κ ≤ 1, sand spreading is activated.

[0050] Furthermore, during the actual sand application, the amount of sand applied is automatically adjusted based on the value of κ. Specifically, the sand application start time is controlled; the larger κ is, the larger the sand application start time t1 is, and the smaller the closing time t2 is (e.g., when κ = 1, t1 = T, t2 = 0); the smaller κ is, the smaller the sand application start time t1 is (where t1 > 0), and the larger the closing time t2 is.

[0051] Of course, in addition to using fuzzy rules, other strategies such as mechanism / empirical formulas, expert rule systems, and state machines can also be used to determine the conditions for starting sand application.

[0052] In step 1), the conditions for determining whether sand spreading is required are: 1. The actual traction / braking force is lower than the set traction / braking force by a certain percentage; 2. The wheelset acceleration / deceleration or creep speed exceeds the set threshold. If one or both of these conditions are met, then sand spreading is required.

[0053] This invention acquires train route information (including current and subsequent route conditions), real-time train speed, set and actual traction force, and adhesion sanding requirements. Based on the train's traction performance, actual speed, and route conditions, it performs real-time sanding control. According to the adhesion control sanding requirements, combined with train automatic driving information, and with the aim of meeting the train's route operation needs, it determines whether sanding is necessary. If sanding is deemed necessary, it adjusts the sanding amount in real-time based on route operation requirements and actual traction / braking force performance, achieving the goals of saving sand, using sand efficiently, and extending the necessary sanding time.

[0054] like Figure 1 As shown in the figure, this embodiment of the invention also discloses a sand spreading control system for rail transit vehicles. Its input information includes: the set traction force of the train, the actual traction force of the train, the train line information, the train formation information, and the adhesion control sand spreading requirements; the corresponding output information is a sand spreading control command, which controls the sand spreading action of the sand spreading system.

[0055] In practical applications, when a train experiences freewheeling and the actual traction / braking force cannot be applied as set, the adhesion control proposes a sand-spreading requirement based on the wheel-rail adhesion conditions, the degree of freewheeling, and the deviation between the actual force and the set force. This part is the same as the conventional method.

[0056] After receiving the sand spreading request from the adhesion control system, the sand spreading control system determines whether it is necessary to start sand spreading based on the set sand spreading necessity assessment strategy, combined with track information, train formation information, track conditions and train operation requirements.

[0057] If it is necessary to start sand spreading, the amount of sand spread will be adjusted in real time according to the actual force exertion and the needs of train operation, so as to meet the needs of operation, save sand and use sand efficiently.

[0058] The rail transit vehicle sand spreading control system and control method of the present invention acquire train operation line information (including current line and subsequent line conditions), real-time train speed, set traction force and actual traction force, adhesion sand spreading requirements, etc. through data communication. Considering the improvement of wheel-rail conditions and the enhancement of the upper limit of traction / braking force in adhesion control, a sand spreading necessity assessment strategy and a sand spreading amount adjustment strategy are set to achieve the purpose of saving sand, using sand efficiently, and extending the necessary sand spreading time.

[0059] This invention also discloses a computer program product, comprising a computer program that, when run by a processor, performs the steps of the method described above. This invention further discloses a computer-readable storage medium storing a computer program that, when run by a processor, performs the steps of the method described above. This invention also discloses a sand-spreading control system for rail transit vehicles, comprising an interconnected memory and a processor, wherein the memory stores a computer program that, when run by a processor, performs the steps of the method described above. The products, media, and systems of this invention, corresponding to the methods described above, also possess the advantages described above.

[0060] The present invention can implement all or part of the processes in the methods of the above embodiments, or it can be implemented by hardware related to computer program instructions. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, it can implement the steps of the above method embodiments. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form. The computer-readable storage medium includes: any entity or device capable of carrying computer program code, recording media, USB flash drive, portable hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. The memory is used to store computer programs and / or modules. The processor implements various functions by running or executing the computer programs and / or modules stored in the memory, and by calling data stored in the memory. The memory may include high-speed random access memory, as well as non-volatile memory, such as hard disks, RAM, plug-in hard disks, smart media cards (SMC), secure digital (SD) cards, flash cards, at least one disk storage device, flash memory device, or other volatile solid-state storage devices.

[0061] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A method for controlling sand spreading on rail transit vehicles, characterized in that, The method comprises the steps of: acquiring operation parameters of the vehicle when the vehicle is in the process of free rolling, and determining whether there is a demand for sanding according to the operation parameters; when there is a demand for sanding, combining the operation parameters of the vehicle and line information to evaluate whether the current traction force exertion meets the operation demand of the subsequent vehicle; if yes, the sanding operation is not started; if not, the sanding operation is started; When there is a sanding requirement The specific process of evaluating whether the current traction force exertion meets the subsequent vehicle operation requirement in combination with the vehicle operation parameters and the line information is as follows: wherein the operating parameters of the vehicle include demanded tractive effort , actual tractive effort , and locomotive speed ; the track information includes track resistance ; According to sanding requirements , requirement traction force , actual traction force and locomotive speed , and then the analysis results are obtained. determining whether to start sanding according to the analysis result; According to sanding requirements , required traction , actual traction , and locomotive speed are analyzed comprehensively, and the specific process of obtaining the analysis result is as follows: sanding requirement , requirement traction force , actual traction force and locomotive speed according to fuzzy rule processing, obtaining analysis result ; wherein ; the specific process of determining whether to start sanding according to the analysis result is: When the sanding is not turned on; wherein is a predetermined value; When the sanding is started.

2. The rail vehicle sanding control method of claim 1, wherein, According to the analysis result to automatically adjust the sanding amount; wherein The greater the sanding amount is greater; The smaller the sanding amount is smaller.

3. The rail vehicle sanding control method of claim 2, wherein, According to the analysis result to adjust the sanding time for automatic adjustment of the sanding amount; wherein The greater, the greater t1 / T; The smaller, the smaller t1 / T; wherein t1 is the sanding opening duration; T is the sanding period, including the sanding opening duration t1 and the sanding closing duration t2, that is, T=t1+t2.

4. The rail vehicle sanding control method of any of claims 1-3, wherein, when determining whether there is a demand for sanding according to the operation parameters, the corresponding operation parameters include actual traction / braking force and set traction / braking force.

5. A computer program product comprising a computer program, characterized in that, The computer program, when executed by a processor, performs the steps of the method according to any one of claims 1-4.

6. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program, when executed by a processor, performs the steps of the method according to any one of claims 1-4.

7. A rail vehicle sanding control system comprising a memory and a processor interconnected, the memory having stored thereon a computer program, wherein, The computer program, when executed by a processor, performs the steps of the method according to any one of claims 1-4.

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