Railway vehicle and sanding control method, device and computer storage medium thereof

Abstract

The application discloses a rail vehicle and a sanding control method, device and computer storage medium thereof. The method comprises the following steps: obtaining a target sanding amount of the rail vehicle; adjusting a sanding coarse adjustment device of the rail vehicle according to a preset sanding amount range corresponding to the target sanding amount, so that a first actual sanding amount of the rail vehicle falls within the preset sanding amount range; and adjusting a sanding fine adjustment device of the rail vehicle according to the adjusted first actual sanding amount, so as to keep a second actual sanding amount equal to the target sanding amount. The method can more accurately control the sanding condition through the combined adjustment of the sanding coarse adjustment and the sanding fine adjustment, so that the sand is more uniformly and effectively sprayed between the wheel and the rail, the wheel and rail contact state in the low adhesion condition is improved, the braking effect is improved, and the safety and stability of train operation are ensured.

Description

Technical Field

[0001] This invention relates to the field of urban rail vehicle braking system technology, and in particular to a rail vehicle and its sand-spreading control method, device and computer storage medium. Background Technology

[0002] In the field of rail vehicles, the braking performance of vehicles has always been a concern for those skilled in the art and even ordinary consumers. Under low adhesion conditions, the braking performance of vehicles can be improved by a sand spraying system. By spraying sand between the wheel and rail to increase the adhesion coefficient between the wheel and rail, the braking efficiency and stability of rail vehicles can be effectively improved.

[0003] Currently, the sand spreading amount of existing rail vehicles is mainly adjusted through pressure reducing valves. However, different rail vehicles may have different configuration parameters, number of sand spreading units, length, layout and direction of sand spreading pipelines, and braking requirements, which results in differences in the amount of sand spread by the vehicles.

[0004] To ensure that different vehicles meet the same standard for sand application rate, it is necessary to design sand application modules with many preset values. This often necessitates redesign or rework, resulting in wasted resources. Furthermore, it leads to inaccurate sand application rate control and low work efficiency. Summary of the Invention

[0005] One of the objectives of this invention is to provide a sand-spreading control method for rail vehicles, in order to solve the technical problems of long debugging time, inaccurate control, and low work efficiency in the prior art, which uses a pressure reducing valve to set different sand-spreading amounts.

[0006] One of the objectives of this invention is to provide a sand-spreading control device for rail vehicles.

[0007] One of the objectives of this invention is to provide a computer storage medium.

[0008] To achieve one of the above-mentioned objectives, the present invention provides a method for controlling sand spreading on a rail vehicle, comprising: obtaining a target sand spreading amount for the rail vehicle; adjusting a coarse sand spreading device of the rail vehicle according to a preset sand spreading amount range corresponding to the target sand spreading amount, so that a first actual sand spreading amount of the rail vehicle falls within the preset sand spreading amount range; and adjusting a fine sand spreading device of the rail vehicle according to the adjusted first actual sand spreading amount to maintain a second actual sand spreading amount equal to the target sand spreading amount.

[0009] As a further improvement of one embodiment of the present invention, the coarse sand-spreading device of the rail vehicle includes at least one of a sand-spreading pressure reducing valve, a sand-spreading pressure regulating valve, a sand-spreading solenoid valve, and a sand-spreading relay valve; the fine sand-spreading device of the rail vehicle includes a fine adjuster installed near the sand-spreading shaft.

[0010] As a further improvement of one embodiment of the present invention, the sand-spraying pressure reducing valve includes a low-pressure sand-spraying pressure reducing valve, the configuration parameters of which include a low-pressure sand-spraying pressure value; and / or, the sand-spraying pressure reducing valve includes a high-pressure sand-spraying pressure reducing valve, the configuration parameters of which include a high-pressure sand-spraying pressure value.

[0011] As a further improvement of one embodiment of the present invention, the target sand spreading amount includes at least one of low-pressure target sand spreading amount and high-pressure target sand spreading amount.

[0012] As a further improvement of one embodiment of the present invention, before the step of "adjusting the coarse sand-spreading device of the rail vehicle according to a preset sand-spreading range corresponding to the target sand-spreading amount, so that the first actual sand-spreading amount of the rail vehicle falls within the preset sand-spreading range", the method includes: acquiring and determining the sand-spreading method and target sand-spreading amount of the rail vehicle according to the current operating speed of the rail vehicle; wherein, the sand-spreading method includes at least one of high-pressure sand-spreading and low-pressure sand-spreading.

[0013] As a further improvement of one embodiment of the present invention, the step of "acquiring and determining the sand spreading method and target sand spreading amount of the rail vehicle based on the current operating speed of the rail vehicle" specifically includes: acquiring and determining whether the current operating speed of the rail vehicle exceeds a preset speed threshold; if yes, then determining that the sand spreading method of the rail vehicle is high-pressure sand spreading and the target sand spreading amount is a high-pressure target sand spreading amount; if no, then determining that the sand spreading method of the rail vehicle is low-pressure sand spreading and the target sand spreading amount is a low-pressure target sand spreading amount.

[0014] As a further improvement of one embodiment of the present invention, the method further includes: determining whether the low-pressure sand spreading pipeline and the high-pressure sand spreading pipeline of the rail vehicle are configured to share a fine adjuster; if yes, then controlling the rail vehicle to perform sand spreading amount adjustment operation in the manner of first low-pressure sand spreading and then high-pressure sand spreading; if no, then controlling the low-pressure sand spreading pipeline and the high-pressure sand spreading pipeline to perform sand spreading operation in the manner of first coarse sand spreading and then fine sand spreading.

[0015] As a further improvement of one embodiment of the present invention, the target sand spreading amount includes a low-pressure target sand spreading amount and a high-pressure target sand spreading amount; the step of "adjusting the coarse sand spreading device of the rail vehicle according to a preset sand spreading amount range corresponding to the target sand spreading amount, so that the first actual sand spreading amount of the rail vehicle falls within the preset sand spreading amount range" specifically includes: adjusting the pressure value of the low-pressure sand spreading pressure reducing valve of the rail vehicle according to the preset low-pressure sand spreading amount range, so that the first actual sand spreading amount of the rail vehicle falls within the preset low-pressure sand spreading amount range; the step of "adjusting the fine sand spreading shaft device of the rail vehicle according to the adjusted first actual sand spreading amount to keep the second actual sand spreading amount equal to the target sand spreading amount" specifically includes: adjusting the fine sand spreading device of the rail vehicle according to the adjusted first actual sand spreading amount. The method further includes: adjusting the rotation parameters of the fine-tuning device corresponding to the sand-spreading shaft of the rail vehicle to maintain the second actual sand-spreading amount equal to the low-pressure target sand-spreading amount; after "adjusting the fine-tuning device of the rail vehicle sand-spreading according to the adjusted first actual sand-spreading amount to maintain the second actual sand-spreading amount equal to the target sand-spreading amount", the method further includes: adjusting the pressure value of the high-pressure sand-spreading pressure reducing valve of the rail vehicle according to the preset high-pressure sand-spreading amount range and the adjusted second actual sand-spreading amount, so that the third actual sand-spreading amount of the rail vehicle falls within the preset high-pressure sand-spreading amount range; and adjusting the rotation parameters of the fine-tuning device corresponding to the sand-spreading shaft of the rail vehicle according to the adjusted third actual sand-spreading amount to maintain the fourth actual sand-spreading amount equal to the high-pressure target sand-spreading amount.

[0016] As a further improvement to one embodiment of the present invention, the step of "adjusting the fine-tuning device of the rail vehicle according to the adjusted first actual sand spreading amount to keep the second actual sand spreading amount equal to the target sand spreading amount" specifically includes: obtaining the current rotation parameters of the fine-tuning device installed near the sand spreading axis of the rail vehicle; wherein, the rotation parameters include the number of revolutions and the direction of rotation of the fine-tuning device; calculating the second actual sand spreading amount corresponding to the current rotation parameters according to the correspondence between the rotation parameters of the fine-tuning device and the sand spreading amount; determining whether the second actual sand spreading amount is equal to the target sand spreading amount; if not, adjusting the rotation parameters of the fine-tuning device near the sand spreading axis of the rail vehicle until the updated second actual sand spreading amount is equal to the target sand spreading amount, and determining and controlling the rail vehicle to perform the sand spreading operation with the target rotation parameters.

[0017] To achieve one of the above-mentioned objectives, the present invention also provides a rail vehicle sand-spreading control device, comprising: an input module for acquiring a target sand-spreading amount for the rail vehicle; a sand-spreading valve pressure control module for adjusting the rail vehicle sand-spreading coarse adjustment device according to a preset sand-spreading amount range corresponding to the target sand-spreading amount, so that a first actual sand-spreading amount of the rail vehicle falls within the preset sand-spreading amount range; a sand-spreading flow control module for adjusting the rail vehicle sand-spreading fine adjustment device according to the adjusted first actual sand-spreading amount, so as to keep a second actual sand-spreading amount equal to the target sand-spreading amount; and a storage module for storing the mapping relationship between the configuration parameters of the rail vehicle sand-spreading coarse adjustment device and the first actual sand-spreading amount, and for storing the mapping relationship between the configuration parameters of the rail vehicle sand-spreading fine adjustment device and the second actual sand-spreading amount.

[0018] As a further improvement of one embodiment of the present invention, the sand-spreading control device further includes a first sand-spreading adjustment module and a second sand-spreading adjustment module; the first sand-spreading adjustment module and the second sand-spreading adjustment module are connected in series between the sand-spreading air cylinder and the sand-spreading unit; the first sand-spreading adjustment module is used for pressure adjustment of the sand-spreading operation of the rail vehicle to realize the coarse adjustment operation of the rail vehicle; the second sand-spreading adjustment module is used for flow control of the sand-spreading operation of the rail vehicle to realize the fine adjustment operation of the rail vehicle.

[0019] As a further improvement of one embodiment of the present invention, the sand spreading control device further includes a sand spreading solenoid valve, a first sand spreading shaft and a second sand spreading shaft. The sand spreading solenoid valve is connected to the first sand spreading shaft and the second sand spreading shaft and is used to control the sand spreading unit of at least one of the sand spreading shafts to perform sand spreading operation.

[0020] As a further improvement of one embodiment of the present invention, the control command for the sand spreading unit to perform the sand spreading operation is formed based on the vehicle's running direction.

[0021] As a further improvement of one embodiment of the present invention, the rail vehicle is configured to: perform the steps of the rail vehicle sand spreading control method; or include the rail vehicle sand spreading control device.

[0022] To achieve one of the above-mentioned objectives, the present invention also provides a computer storage medium storing a computer program, wherein the computer program, when executed, causes the device containing the computer storage medium to perform the steps of the above-described rail vehicle sand spreading control method.

[0023] Compared with the prior art, the embodiments of the present invention have at least one of the following beneficial effects:

[0024] This invention employs a sand-spreading control method for rail vehicles. By combining coarse and fine adjustments to the sand-spreading process, the sand-spreading situation can be controlled more precisely, resulting in more uniform and effective sand spraying between the wheel and rail. This improves wheel-rail contact under low adhesion conditions and enhances braking performance. Furthermore, reasonable coarse and fine adjustment settings can reduce commissioning and operating costs, enhance the flexibility of the sand-spreading control system, and ensure the safety and stability of train operation. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the steps of a sand-spreading control method for rail vehicles according to an embodiment of the present invention.

[0026] Figure 2 This is a schematic diagram of some steps in a method for controlling sand spreading on rail vehicles according to an embodiment of the present invention.

[0027] Figure 3 This is a schematic diagram of some steps of the sand spreading control method for rail vehicles in the first embodiment of the present invention.

[0028] Figure 4 This is a detailed schematic diagram of step S3 of the sand spreading control method for rail vehicles in one embodiment of the present invention.

[0029] Figure 5(a) is a schematic diagram of the structure of a single fine adjuster shared by the high-pressure sand spreading pipeline and the low-pressure sand spreading pipeline in a rail vehicle sand spreading control system according to an embodiment of the present invention.

[0030] Figure 5(b) is a schematic diagram of the rail vehicle in the running direction of the rail vehicle sand spreading control method according to an embodiment of the present invention.

[0031] Figure 5(c) is a schematic diagram of the structure of the high-pressure sand spreading pipeline and the low-pressure sand spreading pipeline using two fine adjusters in the sand spreading control system for rail vehicles according to an embodiment of the present invention. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the scope of protection of the present invention.

[0033] It should be noted that the term "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," "third," "fourth," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] This invention provides a method for controlling sand spreading on rail vehicles, such as... Figure 1 As shown, the specific steps include the following:

[0035] Step S1: Obtain the target sand spreading amount for the rail vehicle;

[0036] Step S2: Adjust the coarse sand-spreading device of the rail vehicle according to the preset sand-spreading range corresponding to the target sand-spreading amount, so that the first actual sand-spreading amount of the rail vehicle falls within the preset sand-spreading range.

[0037] Step S3: Adjust the sand-spreading fine-tuning device of the rail vehicle according to the adjusted first actual sand-spreading amount to keep the second actual sand-spreading amount equal to the target sand-spreading amount.

[0038] Thus, by combining coarse and fine adjustments to the sand application, the sand application can be controlled more precisely, ensuring that the sand is sprayed more evenly and effectively between the wheel and rail. This improves wheel-rail contact under low adhesion conditions and enhances braking performance. Furthermore, it reduces commissioning and operating costs, increases the flexibility of sand application control, and ensures the safety and stability of train operation.

[0039] The target sand application amount may include at least one of a low-pressure target sand application amount and a high-pressure target sand application amount. In other words, the rail vehicle can be set with different target sand application amounts according to actual needs. Specifically, in one embodiment, the target sand application amount includes a low-pressure target sand application amount, for example, at lower vehicle speeds or in good track conditions, a lower sand application pressure is sufficient. This effectively improves braking performance while avoiding unnecessary sand consumption.

[0040] In another embodiment, the target sand application amount includes a high-pressure target sand application amount. For example, at higher vehicle speeds, or in poor track conditions (such as slippery tracks or tracks with contaminants), or when enhanced braking performance is required, a higher sand application amount is needed to provide better braking performance. Thus, a high-pressure target sand application amount can better improve adhesion, shorten braking distance and time, and improve the vehicle's braking response speed and safety.

[0041] Furthermore, the target sand application amount (i.e., low-pressure target sand application amount or high-pressure target sand application amount) can represent a fixed value or a range of values. Here, the present invention does not impose any specific limitations.

[0042] This invention employs a two-point adjustment method, specifically through coarse and fine sand application adjustments, to quickly, accurately, and safely control the target sand application amount for rail vehicles.

[0043] On one hand, the coarse sand-spreading device for the rail wheel may include at least one of a sand-spreading pressure-reducing valve, a sand-spreading pressure-regulating valve, a sand-spreading solenoid valve, and a sand-spreading relay valve. For example, single-stage sand spreading (i.e., fixed sand spreading pressure) can be achieved using a sand-spreading pressure-reducing valve or a sand-spreading pressure-regulating valve, or variable-speed sand spreading (i.e., dynamic change in sand spreading pressure) can be achieved using a sand-spreading solenoid valve and a sand-spreading relay valve. The choice can be made freely according to actual needs, and no specific restrictions are imposed here. This invention uses a sand-spreading pressure-reducing valve for coarse adjustment as an example, but it is not necessarily a sand-spreading pressure-reducing valve; it could also be a sand-spreading electric regulating valve or a combination of a solenoid valve and a relay valve.

[0044] Specifically, based on different sand-spreading pressures, in one embodiment, the sand-spreading pressure reducing valve may include a low-pressure sand-spreading pressure reducing valve, the corresponding configuration parameters of which include a low-pressure sand-spreading pressure value (e.g., 3 bar); in another embodiment, the sand-spreading pressure reducing valve may include a high-pressure sand-spreading pressure reducing valve, the corresponding configuration parameters of which include a high-pressure sand-spreading pressure value (e.g., 6 bar); in a preferred embodiment, the above two embodiments may be used in combination, and the sand-spreading pressure value may be freely selected according to the actual situation. This invention does not impose specific limitations.

[0045] Understandably, the operating speed of the rail vehicle has a direct impact on the sand spreading situation. Based on this, before step S2, the rail vehicle sand spreading control method may include:

[0046] Step P2: Obtain and determine the sand spreading method and target sand spreading amount of the rail vehicle based on the current operating speed of the rail vehicle.

[0047] In this way, by selecting the appropriate sand spreading method according to the speed, the braking performance and operational efficiency of rail vehicles can be better balanced, improving safety and stability, with high adaptability and strong reliability.

[0048] The sand spreading method includes at least one of high-pressure sand spreading and low-pressure sand spreading. Further, based on the relationship between the operating speed of the rail vehicle and the sand spreading pressure, step P2 may specifically include the following steps:

[0049] Step P21: Obtain and determine whether the current operating speed of the rail vehicle exceeds the preset speed threshold;

[0050] If so, proceed to step P22A to determine that the sand spreading method of the rail vehicle is high-pressure sand spreading, and the target sand spreading amount is high-pressure target sand spreading amount;

[0051] If not, proceed to step P22B to determine that the sand spreading method of the rail vehicle is low-pressure sand spreading, and the target sand spreading amount is the low-pressure target sand spreading amount.

[0052] In this way, by selecting the appropriate sand spreading method according to the speed, the braking effect can be optimized, sand consumption can be reduced, and the safety, stability and economy of rail vehicles can be improved.

[0053] Preferably, the preset speed threshold is 80-100 km / h. For example, the speed of urban rail transit is generally lower than the preset speed threshold, so low-pressure sand spreading can be performed; while the speed of high-speed rail is relatively high, so high-pressure sand spreading can be performed; of course, there may also be situations where both low-pressure and high-pressure sand spreading are carried out, and the sand spreading level is switched at a certain speed value or time point.

[0054] On the other hand, the sand-spreading fine-tuning device for the track wheel may include a fine adjuster installed near the sand-spreading shaft. By controlling the rotation parameters of the fine adjuster near the sand-spreading shaft, such as the number of revolutions and the direction of rotation, the sand flow rate can be further adjusted to achieve a more precise sand-spreading effect. The rotation parameters of the fine adjuster can be adjusted in real time according to parameters such as vehicle speed, braking requirements, and sand supply.

[0055] Therefore, this invention achieves a fast and accurate sand-spreading method for rail vehicles by sequentially using coarse pressure adjustment and fine flow rate adjustment, which can improve the braking performance of rail vehicles, save resources, reduce costs, and improve operational efficiency.

[0056] Specifically, on the one hand, by coarsely adjusting the pressure, a general pressure range can be determined in a short time to meet the initial braking requirements; then, by finely adjusting the flow rate, the sand flow rate can be finely adjusted, making the sand flow rate more accurately match the braking requirements and achieving a rapid response. On the other hand, by successively performing coarse and fine adjustments, the pressure and flow rate of the sand can be controlled more precisely, improving the braking effect and safety.

[0057] Within a certain range of sand-spreading pressure, the sand-spreading pressure and the sand-spreading amount are directly proportional. That is, the greater the sand-spreading pressure, the greater the sand-spreading amount. In actual working conditions, a large sand-spreading amount corresponds to a large tolerance, and a small sand-spreading amount corresponds to a small tolerance. Judging from the ease of adjustment, it is preferable to first adjust the sand-spreading pressure to low pressure and then adjust the sand-spreading pressure to high pressure.

[0058] Based on this, such as Figure 2 As shown, the rail vehicle sand spreading control method may further include:

[0059] Step S41: Determine whether the low-pressure sand spreading pipeline and the high-pressure sand spreading pipeline of the rail vehicle are configured to share a single fine adjuster;

[0060] If so, proceed to step S42A and control the rail vehicle to perform sand application adjustment operation in the manner of first low-pressure sand application and then high-pressure sand application;

[0061] If not, proceed to step S42B and control both the low-pressure sand spreading pipeline and the high-pressure sand spreading pipeline to perform sand spreading operations in the manner of first coarsely adjusting the sand spreading and then finely adjusting the sand spreading.

[0062] This avoids unnecessary rework and repeated adjustments, improving the efficiency and effectiveness of sand application.

[0063] It should be noted that steps S41 to S42B can be set entirely after step S3, or between step S2 and step S3. The present invention does not impose any specific limitations on this.

[0064] like Figure 3 As shown, in the first embodiment, when the low-pressure sand spreading pipeline and the high-pressure sand spreading pipeline of the rail vehicle are configured with the same fine adjuster, the rail vehicle sand spreading control method may specifically include the following steps:

[0065] Step S1: Obtain the target sand spreading amount for the rail vehicle; wherein, the target sand spreading amount includes the low-pressure target sand spreading amount and the high-pressure target sand spreading amount;

[0066] Step S21: Adjust the pressure value of the low-pressure sand spreading pressure reducing valve of the rail vehicle according to the preset low-pressure sand spreading range, so that the first actual sand spreading amount of the rail vehicle falls within the preset low-pressure sand spreading range.

[0067] Step S31: Based on the adjusted first actual sand spreading amount, adjust the rotation parameters of the fine adjuster corresponding to the sand spreading shaft of the rail vehicle to keep the second actual sand spreading amount equal to the low-pressure target sand spreading amount;

[0068] Step S22: Based on the preset high-pressure sand spreading range and the adjusted second actual sand spreading amount, adjust the pressure value of the high-pressure sand spreading pressure reducing valve of the rail vehicle so that the third actual sand spreading amount of the rail vehicle falls within the preset high-pressure sand spreading range.

[0069] Step S32: Based on the adjusted third actual sand spreading amount, adjust the rotation parameters of the fine adjuster corresponding to the sand spreading axis near the rail vehicle to keep the fourth actual sand spreading amount equal to the high-pressure target sand spreading amount.

[0070] In this way, by making coarse and fine adjustments in the low-pressure range, the range of sand application can be quickly determined, and the sand application amount can be further refined, so that most of the adjustment work can be completed under low pressure, reducing the difficulty of adjustment under high pressure.

[0071] In this embodiment, coarse and fine adjustments are first made at low voltage to complete most of the adjustment work, which reduces the difficulty of high-voltage adjustment and improves work efficiency. After most of the adjustment work is done at low voltage, the final adjustment is performed at high voltage, which provides a basis for subsequent adjustments, avoids unnecessary repeated adjustments, and ensures the accuracy of parameters.

[0072] Therefore, by adopting a sand-sprinkling process of "low-pressure coarse adjustment - low-pressure fine adjustment - high-pressure coarse adjustment - high-pressure fine adjustment", the coarse adjustment is first performed to determine the approximate range, and then the fine adjustment is gradually performed to approach the optimal value, which can reduce experiments and errors and achieve the expected results more quickly.

[0073] Understandably, the number of sand-spreading shafts on a rail vehicle directly affects the sand-spreading effect and efficiency. Therefore, referring to Figure 5(a), when the rail vehicle is equipped with only one sand-spreading shaft (e.g., w1 or w2) to perform the sand-spreading operation, a low-pressure coarse adjustment is first made to ensure that the sand-spreading amount falls within the preset low-pressure sand-spreading amount range, followed by a low-pressure fine adjustment until the actual sand-spreading amount is equal to the low-pressure target sand-spreading amount; then a high-pressure coarse adjustment is made to ensure that the sand-spreading amount falls within the preset high-pressure sand-spreading amount range, followed by a high-pressure fine adjustment until the actual sand-spreading amount is equal to the high-pressure target sand-spreading amount.

[0074] Referring again to Figure 5(a), when two sand-spreading shafts (w1 and w2) are configured to perform sand-spreading operations, first, the sand-spreading amount of one of the sand-spreading shafts (e.g., w1) is coarsely adjusted at low pressure to ensure it falls within the preset low-pressure sand-spreading amount range. Then, the sand-spreading amount of the other sand-spreading shaft (w2) is also coarsely adjusted at low pressure to confirm whether it falls within the preset low-pressure sand-spreading amount range. If so, the fine-tuning devices near the two sand-spreading shafts are finely adjusted to make the actual sand-spreading amount of the two shafts equal to their corresponding low-pressure target sand-spreading amount. Next, the sand-spreading amount of one of the sand-spreading shafts (e.g., w1) is coarsely adjusted at high pressure to ensure it falls within the preset high-pressure sand-spreading amount range. Then, the sand-spreading amount of the other sand-spreading shaft (w2) is also coarsely adjusted at high pressure to confirm whether it falls within the preset high-pressure sand-spreading amount range. If so, the fine-tuning devices near the two sand-spreading shafts are finely adjusted to make the actual sand-spreading amount of the two shafts equal to their corresponding high-pressure target sand-spreading amount. The sand-spreading operation for multiple sand-spreading shafts is similar and will not be described in detail here.

[0075] In the second embodiment, as shown in Figure 5(c), when different fine adjusters are used for the low-pressure and high-pressure sand-spreading pipelines of the rail vehicle, the sand-spreading adjustment operations of the low-pressure and high-pressure sand-spreading pipelines are independent of each other. Both can be adjusted in the order of coarse adjustment (pressure adjustment) followed by fine adjustment (flow rate adjustment), and the sand-spreading control of the two pipelines will not affect each other. In other words, when the rail vehicle performs coarse sand-spreading operation, there is no necessary requirement for the adjustment order of low-pressure and high-pressure; similarly, when performing fine sand-spreading operation, there is no limitation on the order of low-pressure fine adjustment and high-pressure fine adjustment.

[0076] Thus, by configuring two fine adjusters, it is possible to avoid situations where, after performing "low-voltage coarse adjustment - low-voltage fine adjustment - high-voltage coarse adjustment," performing "high-voltage fine adjustment" would affect the already adjusted low-voltage result. Similarly, it can also be divided into one sand-spraying shaft and two sand-spraying shafts, as described above, and will not be repeated here.

[0077] Referring to Figure 5(c), the rail vehicle uses the first sand-spreading adjustment module (including F01.06 and F01.11 or F01.07 and F01.12) to adjust the pressure of the sand-spreading operation, thereby achieving the coarse adjustment operation of the rail vehicle; then, by controlling the rotation parameters of the low-pressure sand-spreading shaft fine adjusters F06 / 01 and F06 / 02 (i.e., "low-pressure fine adjustment") and / or the sand-spreading fine adjusters F08 / 01 and F08 / 02 (i.e., "high-pressure fine adjustment"), the flow rate of the sand-spreading operation is adjusted, thereby achieving the fine adjustment operation of the rail vehicle.

[0078] like Figure 4 As shown, in one embodiment, step S3 may further include the following steps:

[0079] Step S331: Obtain the current rotation parameters of the fine-tuning device installed near the sand-spreading shaft of the rail vehicle; wherein, the rotation parameters include the number of revolutions and the direction of rotation of the fine-tuning device;

[0080] Step S332: Calculate the second actual sand application amount corresponding to the current rotation parameters based on the correspondence between the rotation parameters of the fine adjuster and the sand application amount.

[0081] Step S333: Determine whether the second actual sand spreading amount is equal to the target sand spreading amount;

[0082] If not, proceed to step S334, adjust the rotation parameters of the fine-tuning device near the sand-spreading axis of the rail vehicle until the updated second actual sand-spreading amount is equal to the target sand-spreading amount, and determine and control the rail vehicle to perform the sand-spreading operation with the target rotation parameters.

[0083] This improves the accuracy and reliability of sand application rate.

[0084] The rotation direction of the fine adjuster can be used to control the increase or decrease of the amount of sand applied. When the fine adjuster is tightened, the sand application orifice becomes smaller, and the corresponding amount of sand applied also decreases; conversely, when the fine adjuster is loosened, the sand application orifice becomes larger, and the corresponding amount of sand applied also increases. The number of rotations represents the degree of control the fine adjuster has over the amount of sand applied. The greater the number of rotations, the greater the degree to which the fine adjuster is tightened or loosened, thus allowing for more precise or obvious control over the amount of sand applied.

[0085] The various embodiments, examples, or specific examples provided by this invention can be combined with each other to ultimately form multiple better embodiments.

[0086] Based on practical experience in adjusting the sand application rate, starting with a small amount and increasing it may not yield a noticeable increase due to the small starting point. Conversely, starting with a large amount and decreasing it will result in a noticeable reduction, even a slight decrease. Therefore, during the coarse adjustment phase, to achieve a relatively large sand application rate and ensure a significant adjustment effect, it is preferable to adjust towards a larger sand application rate. This provides a wider adjustment range during the fine adjustment phase when further adjustments or fine-tuning of the sand application rate are needed.

[0087] For example, assuming the target sand spreading amount for low pressure is (400±100)g / 30s and the target sand spreading amount for high pressure is (1000±200)g / 30s; first, adjust several low-pressure sand spreading pressure reducing valves on the rail vehicle to the same pressure value (for example, based on experience, the pressure value of the initial low-pressure sand spreading pressure valve can be set to 3 bar). Based on the above practical adjustment experience, the tolerance of the initial low-pressure sand spreading amount can be taken as the upper tolerance + 50g / 30s, so that the first actual sand spreading amount after low-pressure coarse adjustment is (400+150)g / 30s; subsequently, by adjusting the fine adjuster (for example, tightening it) to control the sand spreading flow of the sand spreading shaft, the low-pressure sand spreading amount is adjusted to the target low-pressure sand spreading amount of (400±100)g / 30s.

[0088] Maintain the fine-tuning parameters corresponding to the low-pressure sand spreading amount, and then adjust several high-pressure sand spreading pressure reducing valves on the rail vehicle to the same pressure value (for example, based on experience, the pressure value of the initial low-pressure sand spreading pressure valve can be set to 6 bar). Based on the above actual adjustment experience, the initial low-pressure sand spreading amount tolerance can be taken as the upper tolerance + 100g / 30s, and the second actual sand spreading amount after high-pressure coarse adjustment is (1000+300)g / 30s. Subsequently, by adjusting the fine-tuning device (for example, tightening it) to control the sand spreading flow of the sand spreading shaft, the high-pressure sand spreading amount is adjusted to the high-pressure target sand spreading amount of (1000±200)g / 30s.

[0089] To ensure the reliability of the adjustment, after performing high-pressure coarse and fine adjustments, the low-pressure sand-spreading amount of the sand-spreading shaft on the rail vehicle can be rechecked to ensure it falls within the target low-pressure sand-spreading amount of (400±100) g / 30s. If the low-pressure sand-spreading amount of any sand-spreading shaft does not meet the requirement, the fine-tuning device can be adjusted until the target low-pressure sand-spreading amount is met; then the high-pressure sand-spreading amount of the sand-spreading shaft is checked again until it also meets the requirement. This ensures the reliability and accuracy of the sand-spreading amount adjustment.

[0090] In addition, the mapping relationship between the pressure values ​​and the rotation parameters of the sand spreading shaft after coarse and fine adjustments and the target sand spreading amount can be saved to a database or file to provide a basis for subsequent sand spreading control of rail vehicles.

[0091] The present invention also provides a sand-spreading control device for rail vehicles, which can execute the aforementioned rail vehicle sand-spreading control method to control sand spreading on rail vehicles. The sand-spreading control device may include:

[0092] The input module is used to obtain the target sand spreading amount of the rail vehicle;

[0093] The sand spreading valve pressure control module is used to adjust the sand spreading coarse adjustment device of the rail vehicle according to the preset sand spreading range corresponding to the target sand spreading amount, so that the first actual sand spreading amount of the rail vehicle falls within the preset sand spreading range.

[0094] The sand spreading flow control module is used to adjust the sand spreading fine adjustment device of the rail vehicle according to the adjusted first actual sand spreading amount, so as to keep the second actual sand spreading amount equal to the target sand spreading amount;

[0095] The storage module is used to store the mapping relationship between the configuration parameters of the coarse sand-spreading device of the rail vehicle and the first actual sand-spreading amount, and to store the mapping relationship between the configuration parameters of the fine sand-spreading device of the rail vehicle and the second actual sand-spreading amount.

[0096] Thus, by combining coarse and fine adjustments to the sand application, the sand application can be controlled more precisely, resulting in more even and effective sand application between the wheel and rail, thereby improving braking performance. Furthermore, proper coarse and fine adjustment settings can reduce unnecessary sand consumption, lower operating costs, enhance the flexibility of the sand application control system, and ensure the safety and stability of train operation.

[0097] As shown in Figure 5(a), the sand-spreading control device may further include a first sand-spreading adjustment module (including F01.06 and F01.11 or F01.07 and F01.12). The first sand-spreading adjustment module is used for pressure adjustment of the sand-spreading operation of the rail vehicle to realize the coarse adjustment operation of the rail vehicle. A second sand-spreading adjustment module is connected in series between the sand-spreading air cylinder (F02) and the sand-spreading unit. The second sand-spreading adjustment module (F06) is used for flow control of the sand-spreading operation of the rail vehicle to realize the fine adjustment operation of the rail vehicle.

[0098] This allows for both coarse and fine adjustments to the sand-spreading operation, enabling more precise sand-spreading control, reducing unnecessary sand consumption, lowering operating costs, enhancing the flexibility of the sand-spreading control system, and ensuring the safety and stability of train operation.

[0099] Referring again to Figure 5(a), the sand-spreading control device further includes a sand-spreading solenoid valve (F01.04), a first sand-spreading shaft w1, and a second sand-spreading shaft w4. The sand-spreading solenoid valve is connected to the first sand-spreading shaft w1 and the second sand-spreading shaft w4, and is used to control the sand-spreading unit of at least one of the sand-spreading shafts to perform a sand-spreading operation. The control command for the sand-spreading unit to perform the sand-spreading operation is generated based on the vehicle's direction of travel.

[0100] In other words, the sand-spreading solenoid valve (F01.04) is used to control which sand-spreading shaft performs the sand-spreading operation, which can be determined according to the operating direction of the rail vehicle. Referring to Figure 5(b), if the figure is the pipeline diagram of car M02, and the number of train axles from left to right is defined as 1, 2, 3, 4, when the rail vehicle travels to the left in the direction of the arrow in the figure, the first sand-spreading shaft w1 (i.e., the first axle of car M02) is controlled to perform the sand-spreading operation; when the rail vehicle travels in the opposite direction of the arrow in the figure (i.e., to the right), the second sand-spreading shaft w4 (i.e., the fourth axle of car M02) is controlled to perform the sand-spreading operation.

[0101] Referring again to Figure 5(a), based on the control device, the specific process of the sand spreading control system of the rail vehicle performing the sand spreading operation is summarized according to the structural diagram.

[0102] The sand-spreading control system includes a control unit E01, a sand-spreading control module F01, a sand-spreading air cylinder F02, a sand-spreading unit F03, a sand-spreading pipe heater F04, a sand box F05, and fine adjusters F06 and F07. The air inlet of the sand-spreading control module F01 is connected to the air compressor supply. The compressed air through the air inlet is connected to the inlet of filter F01.01, which filters impurities from the compressed air. The outlet of the air filter F01.01 is connected to the inlet of a one-way valve F01.02. The outlet of the one-way valve F01.02 is connected to the inlet of an isolation valve F01.03, which can be used to cut off the air supply to the sand-spreading system in case of a fault. The outlet of the isolation valve F01.03 is connected to the sand-spreading air cylinder F02.

[0103] When a sand-spreading command is received, compressed air passes through the low-pressure sand-spreading pressure reducing valve F01.11 and the high-pressure sand-spreading pressure reducing valve F01.12, respectively, reducing the total air cylinder pressure to the preset low-pressure sand-spreading pressure value (e.g., 3 bar) and the preset high-pressure sand-spreading pressure value (e.g., 6 bar). The low-pressure sand-spreading pressure reducing valve F01.11 is connected to the inlet of the sand-spreading drying solenoid valve F01.05 and the inlet of the low-pressure sand-spreading solenoid valve F01.06. The outlet of the sand-spreading drying solenoid valve F01.05 is connected to the sand-spreading drying pipeline through the fourth outlet of the sand-spreading module F01. The sand-spreading drying pipeline is equipped with a fine-tuning device F07, which directs the dried compressed air to the sand-spreading unit F03 mounted on the sand box F05. The sand-spreading drying pipeline then dries the sand in the sand box F05 through the sand-spreading unit F03. Installing a fine-tuning device F07 on the sand-spreading and drying pipeline can be used to adjust the air flow rate during sand-spreading and drying, regulate the working rate of the air compressor, and prevent the occurrence of air compressor oil emulsification failure.

[0104] The low-pressure sand-spreading pressure reducing valve F01.11 is connected to the low-pressure sand-spreading solenoid valve F01.06, and together they are used for low-pressure adjustment of the sand-spreading operation of the rail vehicle to achieve low-pressure coarse adjustment operation of the rail vehicle; the high-pressure sand-spreading pressure reducing valve F01.12 is connected to the high-pressure sand-spreading solenoid valve F01.07, and together they are used for high-pressure adjustment of the sand-spreading operation of the rail vehicle to achieve high-pressure coarse adjustment operation of the rail vehicle.

[0105] Specifically, during sand spreading adjustment, since high sand spreading pressure corresponds to a large sand spreading volume, the total air pressure can be reduced to a preset fixed value first by adjusting the low-pressure sand spreading pressure reducing valve F01.11 and the high-pressure sand spreading pressure reducing valve F01.12. Then, based on the vehicle's operating speed, the system selects between "low-pressure coarse adjustment" (i.e., controlling the connection of the low-pressure sand spreading solenoid valve F01.06) and "high-pressure coarse adjustment" (i.e., controlling the connection of the high-pressure sand spreading solenoid valve F01.07). Finally, the sand spreading flow rate is controlled by adjusting the rotation parameters of the sand spreading shaft fine adjuster F06 (i.e., "low-pressure fine adjustment" and "high-pressure fine adjustment"). "Low-pressure fine adjustment" and "high-pressure fine adjustment" are for the same sand spreading shaft, while coarse adjustment can be applied to multiple sand spreading shafts.

[0106] The outlets of the low-pressure sand-spreading solenoid valve F01.06 and the high-pressure sand-spreading solenoid valve F01.07 are simultaneously connected to the inlet of the sand-spreading shaft selection solenoid valve F01.04. The outlet of the sand-spreading shaft selection solenoid valve F01.04 is connected to the first sand-spreading pipeline corresponding to the first sand-spreading shaft w1 and the second sand-spreading pipeline corresponding to the second sand-spreading shaft w4. The sand-spreading shaft selection solenoid valve F01.04 can control at least one of the first sand-spreading shaft w1 and the second sand-spreading shaft w4 to perform sand-spreading operations according to the operating direction of the rail vehicle.

[0107] In addition, both the first and second sand-spreading pipelines are equipped with fine adjusters. Compressed air used for sand spreading can reach the sand-spreading unit F03 mounted on the sand box F05 through the fine adjusters. Sand is then spread through the sand-spreading pipeline inside the sand-spreading unit F03, carrying the sand from the sand box into the heated sand-spreading hose F04, which is then sprayed between the wheel and rail to improve track adhesion. The heated sand-spreading hose F04 prevents the sand-spreading nozzle from freezing and clogging the sand-spreading pipe at low temperatures.

[0108] The present invention also provides a rail vehicle, which can be configured to: perform the steps of the rail vehicle sand spreading control method; or include the rail vehicle sand spreading control device.

[0109] The present invention also provides a computer storage medium storing a computer program, wherein the computer program, when executed, causes the device containing the computer storage medium to perform the steps of the rail vehicle sand spreading control method according to any of the preceding technical solutions.

[0110] In summary, the sand-spreading control method for rail vehicles provided by this invention can quickly locate the approximate parameter range by coarsely adjusting the sand-spreading situation of the rail vehicle, saving unnecessary adjustment time and improving work efficiency; further fine-tuning can ensure that the parameters reach the optimal state. Thus, through dual-point adjustment, the pressure and flow rate of sand spreading can be controlled more precisely, improving braking effect, safety, and stability.

[0111] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0112] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for controlling sand spreading on rail vehicles, characterized in that, Including the following steps: Obtain the target sand spreading amount for the rail vehicle; According to the preset sand spreading range corresponding to the target sand spreading amount, the sand spreading coarse adjustment device of the rail vehicle is adjusted so that the first actual sand spreading amount of the rail vehicle falls within the preset sand spreading range. Based on the adjusted first actual sand application amount, the fine-tuning device for sand application on the rail vehicle is adjusted to maintain the second actual sand application amount equal to the target sand application amount, specifically including: Obtain the current rotation parameters of the fine-tuning device installed near the sand-spreading shaft of the rail vehicle; wherein, the rotation parameters include the number of revolutions and the direction of rotation of the fine-tuning device; Based on the correspondence between the rotation parameters of the fine tuner and the amount of sand applied, calculate the second actual amount of sand applied corresponding to the current rotation parameters; Determine whether the second actual sand application amount is equal to the target sand application amount; If not, adjust the rotation parameters of the fine-tuning device near the sand-spreading axis of the rail vehicle until the updated second actual sand-spreading amount is equal to the target sand-spreading amount, and determine and control the rail vehicle to perform the sand-spreading operation with the target rotation parameters.

2. The method for controlling sand spreading on rail vehicles according to claim 1, characterized in that, The coarse sand-spreading device of the rail vehicle includes at least one of a sand-spreading pressure reducing valve, a sand-spreading pressure regulating valve, a sand-spreading solenoid valve, and a sand-spreading relay valve; the fine sand-spreading device of the rail vehicle includes a fine adjuster installed near the sand-spreading shaft.

3. The method for controlling sand spreading on rail vehicles according to claim 2, characterized in that, The sand-spraying pressure reducing valve includes a low-pressure sand-spraying pressure reducing valve, and the configuration parameters of the sand-spraying pressure reducing valve include the low-pressure sand-spraying pressure value; And / or, the sand-spraying pressure reducing valve includes a high-pressure sand-spraying pressure reducing valve, and the configuration parameters of the sand-spraying pressure reducing valve include a high-pressure sand-spraying pressure value.

4. The method for controlling sand spreading on rail vehicles according to claim 1, characterized in that, The target sand spreading amount includes at least one of low-pressure target sand spreading amount and high-pressure target sand spreading amount.

5. The method for controlling sand spreading on rail vehicles according to claim 1, characterized in that, Before the step of "adjusting the coarse sand-spreading device of the rail vehicle according to a preset sand-spreading range corresponding to the target sand-spreading amount, so that the first actual sand-spreading amount of the rail vehicle falls within the preset sand-spreading range", the method includes: The sand spreading method and target sand spreading amount of the rail vehicle are determined based on the current operating speed of the rail vehicle; wherein the sand spreading method includes at least one of high-pressure sand spreading and low-pressure sand spreading.

6. The method for controlling sand spreading on rail vehicles according to claim 5, characterized in that, The phrase "obtaining and determining the sand-spreading method and target sand-spreading amount of the rail vehicle based on its current operating speed" specifically includes: Acquire and determine whether the current operating speed of the rail vehicle exceeds a preset speed threshold; If so, then the sand spreading method of the rail vehicle is determined to be high-pressure sand spreading, and the target sand spreading amount is the high-pressure target sand spreading amount; If not, then the sand spreading method of the rail vehicle is determined to be low-pressure sand spreading, and the target sand spreading amount is the low-pressure target sand spreading amount.

7. The method for controlling sand spreading on rail vehicles according to claim 1, characterized in that, The method further includes: Determine whether the low-pressure sand spreading pipeline and the high-pressure sand spreading pipeline of the rail vehicle are configured to share a single fine adjuster; If so, the rail vehicle is controlled to perform sand application adjustment operation in the manner of first low-pressure sand application and then high-pressure sand application; If not, then control both the low-pressure sand spreading pipeline and the high-pressure sand spreading pipeline to perform sand spreading operations in the manner of first coarsely adjusting the sand spreading and then finely adjusting the sand spreading.

8. The method for controlling sand spreading on rail vehicles according to claim 7, characterized in that, The target sand spreading amount includes a low-pressure target sand spreading amount and a high-pressure target sand spreading amount; the step of "adjusting the coarse sand spreading device of the rail vehicle according to the preset sand spreading amount range corresponding to the target sand spreading amount, so that the first actual sand spreading amount of the rail vehicle falls within the preset sand spreading amount range" specifically includes: According to the preset low-pressure sand spreading range, the pressure value of the low-pressure sand spreading pressure reducing valve of the rail vehicle is adjusted so that the first actual sand spreading amount of the rail vehicle falls within the preset low-pressure sand spreading range. The phrase "adjusting the fine-tuning device of the sand-spreading shaft of the rail vehicle according to the adjusted first actual sand-spreading amount to keep the second actual sand-spreading amount equal to the target sand-spreading amount" specifically includes: Based on the adjusted first actual sand spreading amount, adjust the rotation parameters of the fine adjuster corresponding to the sand spreading axis near the rail vehicle to keep the second actual sand spreading amount equal to the low-pressure target sand spreading amount; After the statement "adjusting the sand-spreading fine-tuning device of the rail vehicle according to the adjusted first actual sand-spreading amount to keep the second actual sand-spreading amount equal to the target sand-spreading amount", the method further includes: Based on the preset high-pressure sand spreading range and the adjusted second actual sand spreading amount, the pressure value of the high-pressure sand spreading pressure reducing valve of the rail vehicle is adjusted so that the third actual sand spreading amount of the rail vehicle falls within the preset high-pressure sand spreading range. Based on the adjusted third actual sand spreading amount, adjust the rotation parameters of the fine adjuster corresponding to the sand spreading axis of the rail vehicle to keep the fourth actual sand spreading amount equal to the high-pressure target sand spreading amount.

9. A sand-spreading control device for rail vehicles, characterized in that, include: The input module is used to obtain the target sand spreading amount of the rail vehicle; The sand spreading valve pressure control module is used to adjust the sand spreading coarse adjustment device of the rail vehicle according to the preset sand spreading range corresponding to the target sand spreading amount, so that the first actual sand spreading amount of the rail vehicle falls within the preset sand spreading range. The sand spreading flow control module is used to adjust the sand spreading fine adjustment device of the rail vehicle according to the adjusted first actual sand spreading amount, so as to keep the second actual sand spreading amount equal to the target sand spreading amount; A storage module is used to store the mapping relationship between the configuration parameters of the coarse sand-spreading device of the rail vehicle and the first actual sand-spreading amount, and to store the mapping relationship between the configuration parameters of the fine sand-spreading device of the rail vehicle and the second actual sand-spreading amount; The sand spreading flow control module is further configured to acquire the current rotation parameters of the fine-tuning device installed near the sand spreading axis of the rail vehicle; wherein the rotation parameters include the number of revolutions and the direction of rotation of the fine-tuning device; calculate the second actual sand spreading amount corresponding to the current rotation parameters based on the correspondence between the rotation parameters of the fine-tuning device and the sand spreading amount; determine whether the second actual sand spreading amount is equal to the target sand spreading amount; if not, adjust the rotation parameters of the fine-tuning device near the sand spreading axis of the rail vehicle until the updated second actual sand spreading amount is equal to the target sand spreading amount, and determine and control the rail vehicle to perform the sand spreading operation with the target rotation parameters.

10. The rail vehicle sand-spreading control device according to claim 9, characterized in that, The sand-spreading control device further includes a first sand-spreading adjustment module and a second sand-spreading adjustment module; the first sand-spreading adjustment module and the second sand-spreading adjustment module are connected in series between the sand-spreading air cylinder and the sand-spreading unit; the first sand-spreading adjustment module is used for pressure adjustment of the sand-spreading operation of the rail vehicle to realize the coarse adjustment operation of the rail vehicle; the second sand-spreading adjustment module is used for flow control of the sand-spreading operation of the rail vehicle to realize the fine adjustment operation of the rail vehicle.

11. The rail vehicle sand-spreading control device according to claim 9, characterized in that, The sand spreading control device further includes a sand spreading solenoid valve, a first sand spreading shaft, and a second sand spreading shaft. The sand spreading solenoid valve is connected to the first sand spreading shaft and the second sand spreading shaft and is used to control the sand spreading unit of at least one of the sand spreading shafts to perform sand spreading operations.

12. The rail vehicle sand-spreading control device according to claim 11, characterized in that, The control commands that enable the sand-spreading unit to perform sand-spreading operations are generated based on the vehicle's direction of travel.

13. A rail vehicle, characterized in that, The rail vehicle is configured to: perform the steps of the rail vehicle sand spreading control method according to any one of claims 1-8; or include the rail vehicle sand spreading control device according to any one of claims 9-12.

14. A computer storage medium storing a computer program, wherein the computer program, when executed, causes the device in which the computer storage medium is located to perform the steps of the rail vehicle sand spreading control method according to any one of claims 1-8.

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