Combined braking method and system for maglev train

Abstract

The present invention relates to the field of braking technology, and discloses a combined braking method and system for a maglev train. The method comprises: obtaining the running speed of the train in real time; comparing the obtained running speed with the predetermined speed V when the electric brake and the disc brake start combined braking; 联合制动 Compare the trains and control the trains to brake with a constant braking force using the corresponding braking method according to the comparison results. This ensures that the train stops accurately at the target parking point. In addition, by braking with a constant braking force, the comfort experience of passengers during the parking process can be guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of braking technology, and in particular to a combined braking method and system for a maglev train. Background Art

[0002] Traditional rail transit (urban subway), ordinary railways and high-speed railways rely on the friction between wheels and rails to generate braking force for braking. The Shanghai High-speed Maglev Train uses electric braking plus eddy current braking, and the requirements for the accuracy of the parking position are not high. Due to the special body structure, the low-vacuum pipeline high-speed maglev train has added retractable and releasable support wheels compared to the Shanghai Maglev Train. In addition, due to the low-vacuum environment, a connecting bridge (passenger boarding and alighting passage) is added to the station, so the requirements for the train stopping on time and the docking error of the connecting bridge are extremely high. The existing braking strategy cannot meet the needs of precise parking. Summary of the invention

[0003] The invention provides a combined braking method and system for a maglev train, which can solve the technical problems in the prior art.

[0004] The present invention provides a combined braking method for a maglev train, wherein the method comprises:

[0005] Get the train's running speed in real time;

[0006] The obtained driving speed is compared with the predetermined speed V when the electric brake and the disc brake start the combined braking. 联合制动 Make comparisons;

[0007] According to the comparison result, the train is controlled to adopt the corresponding braking method to brake with a constant braking force.

[0008] Preferably, controlling the train to brake with a constant braking force using a corresponding braking method according to the comparison result includes:

[0009] When the driving speed is greater than the predetermined speed V at which the electric brake and the disc brake start to brake together 联合制动 In the case of, controlling the train to brake with the constant braking force by electric braking;

[0010] When the obtained driving speed is less than or equal to the predetermined speed V at which the electric brake and the disc brake start the combined braking 联合制动 In this case, the train is controlled to brake with the constant braking force by a combined braking method of electric braking and disc braking, and the braking force in the combined braking method includes electric braking force and disc braking force.

[0011] Preferably, controlling the train to brake with the constant braking force by a combined braking method of electric braking and disc braking comprises:

[0012] Controlling the train to brake for a predetermined time with the constant braking force by electric braking from the start of the combined braking mode;

[0013] After a predetermined time, the train is controlled to perform electric braking with a reduced electric braking force and disc braking with an increased disc braking force while maintaining the constant braking force, wherein the increased disc braking force is determined according to the reduced electric braking force.

[0014] The present invention also provides a combined braking system for a maglev train, wherein the system comprises:

[0015] A speed acquisition device, used to acquire the running speed of the train in real time;

[0016] A comparison device is used to compare the acquired driving speed with a predetermined speed V when the electric brake and the disk brake start the combined braking. 联合制动 Make comparisons;

[0017] The control device is used to control the train to brake with a constant braking force using a corresponding braking method according to the comparison result.

[0018] Preferably, the control device controls the train to brake with a constant braking force using a corresponding braking method according to the comparison result, including:

[0019] When the driving speed is greater than the predetermined speed V at which the electric brake and the disc brake start to brake together 联合制动 In the case of, controlling the train to brake with the constant braking force by electric braking;

[0020] When the obtained driving speed is less than or equal to the predetermined speed V at which the electric brake and the disc brake start the combined braking 联合制动 In this case, the train is controlled to brake with the constant braking force by a combined braking method of electric braking and disc braking, and the braking force in the combined braking method includes electric braking force and disc braking force.

[0021] Preferably, controlling the train to brake with the constant braking force by a combined braking method of electric braking and disc braking comprises:

[0022] Controlling the train to brake for a predetermined time with the constant braking force by electric braking from the start of the combined braking mode;

[0023] After a predetermined time, the train is controlled to perform electric braking with a reduced electric braking force and disc braking with an increased disc braking force while maintaining the constant braking force, wherein the increased disc braking force is determined according to the reduced electric braking force.

[0024] Through the above technical solution, during the braking process of the maglev train at a low speed, the train can be controlled to brake with a constant braking force in a corresponding braking mode according to the comparison result between the obtained running speed and the predetermined speed when the electric brake and the disc brake start to brake together, so as to ensure that the train stops accurately at the target parking point. In addition, by braking with a constant braking force, the passenger comfort experience during the parking process can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The included drawings are used to provide a further understanding of the embodiments of the present invention, which constitute a part of the specification, are used to illustrate the embodiments of the present invention, and together with the text description, explain the principles of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A flow chart of a combined braking method for a maglev train according to an embodiment of the present invention is shown;

[0027] Figure 2 A graph showing the time variations of the electric braking force and the disc braking force in the low speed range according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The technical solutions 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 only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments in 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] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0030] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0031] Figure 1 A flow chart of a combined braking method for a maglev train according to an embodiment of the present invention is shown.

[0032] The maglev train may be a low-vacuum tube high-speed maglev train, and the method may be applied to the precise parking of the low-vacuum tube high-speed maglev train at a low speed.

[0033] like Figure 1 As shown, an embodiment of the present invention provides a combined braking method for a maglev train, wherein the method comprises:

[0034] S100, obtaining the running speed of the train in real time;

[0035] That is, when the train needs to brake, the train's running speed is obtained in real time.

[0036] S102, comparing the obtained driving speed with the predetermined speed V when the electric brake and the disc brake start the combined braking 联合制动 Make comparisons;

[0037] That is, V 联合制动 It indicates the speed when the electric brake and the disk brake start to brake together. The speed can be predetermined, and the present invention is not limited to this.

[0038] S104, controlling the train to brake with a constant braking force using a corresponding braking method according to the comparison result.

[0039] The constant braking force means that the braking deceleration is constant.

[0040] Through the above technical solution, during the braking process of the maglev train at a low speed, the train can be controlled to brake with a constant braking force in a corresponding braking mode according to the comparison result between the obtained running speed and the predetermined speed when the electric brake and the disc brake start to brake together, so as to ensure that the train stops accurately at the target parking point. In addition, by braking with a constant braking force, the passenger comfort experience during the parking process can be guaranteed.

[0041] According to an embodiment of the present invention, controlling the train to brake with a constant braking force using a corresponding braking method according to the comparison result includes:

[0042] When the driving speed is greater than the predetermined speed V at which the electric brake and the disc brake start to brake together 联合制动 In the case of, controlling the train to brake with the constant braking force by electric braking;

[0043] Among them, when only the electric braking method is adopted, the braking force is the electric braking force.

[0044] When the obtained driving speed is less than or equal to the predetermined speed V at which the electric brake and the disc brake start the combined braking 联合制动 In this case, the train is controlled to brake with the constant braking force by a combined braking method of electric braking and disc braking, and the braking force in the combined braking method includes electric braking force and disc braking force.

[0045] That is, the braking force in the electric braking mode only is the same as the braking force in the combined braking mode and is constant.

[0046] For example, the electric braking method may be a braking method in which a ground coil cuts magnetic flux lines to generate electric braking force for braking. The disc braking method may be a braking method in which a brake disc acts on a supporting wheel of the train and generates a disc braking force for braking through indirect friction between the wheel and the track.

[0047] Among them, for the combined braking method, the part of the electric braking force of the electric braking method that is reduced (or attenuated) due to the decrease in speed can be compensated by the disc braking method.

[0048] According to one embodiment of the present invention, controlling the train to brake with the constant braking force by using a combined braking method of electric braking and disc braking comprises:

[0049] Controlling the train to brake for a predetermined time with the constant braking force by electric braking from the start of the combined braking mode;

[0050] After a predetermined time, the train is controlled to perform electric braking with a reduced electric braking force and disc braking with an increased disc braking force while maintaining the constant braking force, wherein the increased disc braking force is determined according to the reduced electric braking force.

[0051] For the electric brake method, the electric brake force is output by the ground mechanism, so the time delay can be ignored. For the disc brake method, the disc brake force is output through the vehicle body mechanism. The difference in the output mechanism and the delay of network communication make the execution of the disc brake method inconsistent and there is a time delay t 时延 , t 时延 =t B -t A ,like Figure 2 As shown, where t B Indicates the moment when the electric brake begins to decay, that is, the moment when the disc brake begins to work, t A Indicates the disc brake triggering moment, i.e. the start moment of the combined braking mode. Thus, by controlling the train to brake with the constant braking force for a predetermined time using the electric braking mode at the start of the combined braking mode, the braking force change caused by the time delay can be overcome to ensure that the braking force remains constant during the braking process of the train.

[0052] Continue to refer Figure 2 , F braking force = F electric (t) + F disk (t), where F electric (t) represents the electric braking force and F disk (t) represents the disk braking force. Under the condition of keeping the constant braking force unchanged, the reduction of the electric braking force can be performed according to a predetermined method, and then the increased disk braking force can be determined according to the reduced electric braking force.

[0053] An embodiment of the present invention further provides a combined braking system for a maglev train, wherein the system comprises:

[0054] A speed acquisition device, used to acquire the running speed of the train in real time;

[0055] A comparison device is used to compare the acquired driving speed with a predetermined speed V when the electric brake and the disk brake start the combined braking. 联合制动 Make comparisons;

[0056] The control device is used to control the train to brake with a constant braking force using a corresponding braking method according to the comparison result.

[0057] Through the above technical solution, during the braking process of the maglev train at a low speed, the train can be controlled to brake with a constant braking force in a corresponding braking mode according to the comparison result between the obtained running speed and the predetermined speed when the electric brake and the disc brake start to brake together, so as to ensure that the train stops accurately at the target parking point. In addition, by braking with a constant braking force, the passenger comfort experience during the parking process can be guaranteed.

[0058] According to an embodiment of the present invention, the control device controls the train to brake with a constant braking force using a corresponding braking method according to the comparison result, including:

[0059] When the driving speed is greater than the predetermined speed V at which the electric brake and the disc brake start to brake together 联合制动 In the case of, controlling the train to brake with the constant braking force by electric braking;

[0060] When the obtained driving speed is less than or equal to the predetermined speed V at which the electric brake and the disc brake start the combined braking 联合制动 In this case, the train is controlled to brake with the constant braking force by a combined braking method of electric braking and disc braking, and the braking force in the combined braking method includes electric braking force and disc braking force.

[0061] According to one embodiment of the present invention, controlling the train to brake with the constant braking force by using a combined braking method of electric braking and disc braking comprises:

[0062] Controlling the train to brake for a predetermined time with the constant braking force by electric braking from the start of the combined braking mode;

[0063] After a predetermined time, the train is controlled to perform electric braking with a reduced electric braking force and disc braking with an increased disc braking force while maintaining the constant braking force, wherein the increased disc braking force is determined according to the reduced electric braking force.

[0064] The system described in the above embodiment and Figure 1 The method described above corresponds to the method described above. For specific examples, please refer to the above description of the method, which will not be repeated here.

[0065] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0066] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0067] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A combined braking method for a maglev train, characterized in that: The method includes: Get the train's running speed in real time; The obtained driving speed is compared with the predetermined speed at which the electric brake and the disc brake start to brake together. V 联合制动 Make comparisons; According to the comparison result, the train is controlled to brake with a constant braking force using a corresponding braking method; Controlling the train to brake with a constant braking force using a corresponding braking method according to the comparison result includes: When the driving speed is greater than the predetermined speed V at which the electric brake and the disc brake start to brake together 联合制动 In the case of, controlling the train to brake with the constant braking force by electric braking; When the obtained driving speed is less than or equal to the predetermined speed V at which the electric brake and the disc brake start the combined braking 联合制动 In this case, the train is controlled to brake with the constant braking force by a combined braking method of electric braking and disc braking, and the braking force in the combined braking method includes electric braking force and disc braking force.

2. The method according to claim 1, characterized in that Controlling the train to brake with the constant braking force by adopting a combined braking method of electric braking and disc braking comprises: Controlling the train to brake for a predetermined time with the constant braking force by electric braking from the start of the combined braking mode; After a predetermined time, the train is controlled to perform electric braking with a reduced electric braking force and disc braking with an increased disc braking force while maintaining the constant braking force, wherein the increased disc braking force is determined according to the reduced electric braking force.

3. A combined braking system for a maglev train, characterized in that: The system includes: A speed acquisition device, used to acquire the running speed of the train in real time; A comparison device is used to compare the acquired driving speed with a predetermined speed V when the electric brake and the disk brake start the combined braking. 联合制动 Make comparisons; A control device, used for controlling the train to brake with a constant braking force using a corresponding braking method according to the comparison result; The control device controls the train to brake with a constant braking force in a corresponding braking mode according to the comparison result, including: When the driving speed is greater than the predetermined speed V at which the electric brake and the disc brake start to brake together 联合制动 In the case of, controlling the train to brake with the constant braking force by electric braking; When the obtained driving speed is less than or equal to the predetermined speed V at which the electric brake and the disc brake start the combined braking 联合制动 In this case, the train is controlled to brake with the constant braking force by a combined braking method of electric braking and disc braking, and the braking force in the combined braking method includes electric braking force and disc braking force.

4. The system according to claim 3, characterized in that Controlling the train to brake with the constant braking force by adopting a combined braking method of electric braking and disc braking comprises: Controlling the train to brake for a predetermined time with the constant braking force by electric braking from the start of the combined braking mode; After a predetermined time, the train is controlled to perform electric braking with a reduced electric braking force and disc braking with an increased disc braking force while maintaining the constant braking force, wherein the increased disc braking force is determined according to the reduced electric braking force.

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