Maglev train and braking method thereof

Abstract

The invention provides a maglev train and a braking method thereof, and relates to the technical field of maglev control. After the suspension force of the maglev train is reduced, the stress of the maglev train is no longer balanced, so that the maglev train is finally pressed on the track, the maglev train is in the advancing process, friction force is generated between the maglev train and the track, and the maglev train can be braked by utilizing the friction force. Under the condition that the electromagnetic braking capacity of the magnetically levitated train does not meet the braking requirement of the magnetically levitated train, the magnetically levitated train is controlled to carry out electromagnetic braking and the suspension force of the magnetically levitated train is controlled to be reduced so as to meet the braking requirement, so that under the condition, the magnetically levitated train can be braked by utilizing the electromagnetic force and can also be braked by utilizing the suspension force; when the maglev train is braked, friction force can be utilized for braking, namely the maglev train can obtain larger braking force, so that the possibility of meeting the braking requirement is improved, and the braking reliability of the maglev train is improved through the braking method.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic levitation control, in particular to a magnetic levitation train and a braking method thereof. Background Art

[0002] The maglev train is a train that is propelled by magnetic levitation. It uses electromagnetic force to achieve non-contact suspension and guidance between itself and the track. In addition, it uses the electromagnetic force generated by the linear motor to achieve its own operation.

[0003] At present, the braking method of maglev trains only includes electromagnetic braking. Once an emergency occurs, electromagnetic braking may not be able to provide sufficient braking force for the maglev train, which may cause a safety accident of the maglev train.

[0004] Therefore, how to improve the braking reliability of maglev trains is a technical problem that needs to be solved urgently. Summary of the invention

[0005] In view of this, the present invention provides a maglev train and a braking method thereof to improve the braking reliability of the maglev train.

[0006] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0007] On one hand, the present application provides a braking method for a maglev train, comprising:

[0008] During the travel of the maglev train, determining whether the maglev train needs to be braked;

[0009] If the maglev train needs to be braked, when the electromagnetic braking capacity of the maglev train does not meet the braking requirement of the maglev train, the maglev train is controlled to perform electromagnetic braking and the suspension force of the maglev train is controlled to be reduced to meet the braking requirement.

[0010] Optionally, when the electromagnetic braking capability of the maglev train does not meet the braking requirement of the maglev train, controlling the maglev train to perform electromagnetic braking and controlling the levitation force of the maglev train to reduce so as to meet the braking requirement includes:

[0011] Controlling the magnetic levitation train to perform electromagnetic braking to meet the braking requirement;

[0012] Determining whether the electromagnetic braking capacity meets the braking requirement;

[0013] If the electromagnetic braking capacity does not meet the braking requirement, the suspension force of the magnetic levitation train is controlled to be reduced to meet the braking requirement.

[0014] Optionally, when the electromagnetic braking capability of the maglev train does not meet the braking requirement of the maglev train, controlling the maglev train to perform electromagnetic braking and controlling the levitation force of the maglev train to reduce so as to meet the braking requirement includes:

[0015] Determining whether the electromagnetic braking capacity meets the braking requirement;

[0016] If the electromagnetic braking capacity meets the braking requirement, controlling the maglev train to perform electromagnetic braking to meet the braking requirement;

[0017] If the electromagnetic braking capacity does not meet the braking requirement, the maglev train is first controlled to perform electromagnetic braking, and then the levitation force of the maglev train is controlled to be reduced to meet the braking requirement.

[0018] Optionally, controlling the levitation force of the maglev train to decrease to meet the braking requirement includes:

[0019] According to the difference between the braking demand and the actual braking capacity of the maglev train, adjusting the set value of the excitation current of the electromagnet in the maglev train;

[0020] The measured value of the input voltage of the electromagnet is adjusted according to the difference between the set value and the measured value of the excitation current of the electromagnet.

[0021] Optionally, judging whether the electromagnetic braking capability meets the braking requirement includes:

[0022] Determining whether the required braking force of the maglev train is greater than the maximum electromagnetic braking force; the maximum electromagnetic braking force is the maximum braking force obtained by the maglev train during its own electromagnetic braking process;

[0023] If the required braking force is greater than the maximum electromagnetic braking force, it is determined that the electromagnetic braking capacity does not meet the braking requirement;

[0024] If the required braking force is less than or equal to the maximum electromagnetic braking force, it is determined that the electromagnetic braking capacity meets the braking requirement.

[0025] Optionally, judging whether the electromagnetic braking capability meets the braking requirement includes:

[0026] Determine whether the required deceleration of the maglev train is greater than the maximum electromagnetic deceleration; the maximum electromagnetic deceleration is the maximum deceleration obtained by the maglev train during its own electromagnetic braking process;

[0027] If the required deceleration is greater than the maximum electromagnetic deceleration, it is determined that the electromagnetic braking capacity does not meet the braking requirement;

[0028] If the required deceleration is less than or equal to the maximum electromagnetic deceleration, it is determined that the electromagnetic braking capacity meets the braking requirement.

[0029] Optionally, before controlling the levitation force of the maglev train to reduce so as to meet the braking requirement, the method further includes:

[0030] The suspension gap of the magnetic levitation train is controlled to be stable at a first target value; the absolute value of the difference between the first target value and the maximum value of the suspension gap is less than a first preset value and greater than zero.

[0031] Optionally, controlling the suspension gap of the magnetic levitation train to be stable at a first target value includes:

[0032] The measured value of the suspension gap is adjusted according to the set value of the suspension gap; the set value of the suspension gap is the smaller value between the first target value and the transition value; the transition value is positively correlated with the duration of the reduction of the suspension force of the maglev train.

[0033] Optionally, also include:

[0034] During the travel of the maglev train, the suspension gap of the maglev train is controlled to be stable at a second target value; the second target value is a value less than a second preset value and greater than zero.

[0035] On the other hand, the present application provides a maglev train, which is used to achieve braking by executing the braking method of the maglev train as described in any one of the previous aspects of the present application.

[0036] It can be seen from the above technical solution that the present invention provides a braking method for a maglev train. In the braking method for the maglev train, since the force on the maglev train is no longer balanced after the levitation force of the maglev train is reduced, the maglev train will eventually press on the track, and the maglev train is in the process of moving, so there is a differential friction between the maglev train and the track, so that the maglev train can use this friction to brake. In addition, when the electromagnetic braking capacity of the maglev train does not meet the braking requirements of the maglev train, the maglev train is controlled to perform electromagnetic braking and the levitation force of the maglev train is controlled to be reduced to meet the above braking requirements. In this case, the maglev train can use both electromagnetic force and friction to brake, that is, the maglev train can obtain greater braking force, thereby increasing the possibility of meeting the above braking requirements. Therefore, the braking method for the maglev train improves the braking reliability of the maglev train. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0038] Figure 1 A schematic flow chart of an implementation method of a braking method for a maglev train is provided for an embodiment of the present application;

[0039] Figure 2 A schematic flow chart of another implementation method of a braking method for a maglev train is provided for an embodiment of the present application;

[0040] Figure 3 A schematic flow chart of another implementation method of a braking method for a maglev train is provided for the embodiment of the present application;

[0041] Figure 4 A schematic flow chart of another implementation method of a braking method for a maglev train is provided for the embodiment of the present application;

[0042] Figure 5 A schematic flow chart of another implementation method of a braking method for a maglev train is provided for the embodiment of the present application;

[0043] Figure 6 A schematic flow chart of another implementation method of a braking method for a maglev train is provided for an embodiment of the present application;

[0044] Figure 7 A schematic flow chart of another implementation method of a braking method for a maglev train is provided for the embodiment of the present application;

[0045] Figure 8 A schematic flow chart of another implementation method of a braking method for a maglev train is provided for the embodiment of the present application;

[0046] Fig. 9 Schematic diagram of the suspension gap of a maglev train. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0048] In this application, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0049] In order to improve the braking reliability of a maglev train, the present application embodiment provides a braking method for a maglev train, and the specific process is as follows: Figure 1 As shown, the specific steps include:

[0050] S110: During the movement of the maglev train, determine whether the maglev train needs to be braked.

[0051] If the maglev train needs to brake, step S120 is executed; if the maglev train does not need to brake, the braking method of the maglev train is stopped.

[0052] In a specific example, if a braking command is received, it indicates that the maglev train needs to brake. Conversely, if no braking command is received, it indicates that the maglev train does not need to brake.

[0053] It should be noted that the braking instruction is already very mature in the prior art and will not be described in detail here.

[0054] The above example only shows a specific implementation method of whether a maglev train needs to brake. No specific limitation is made here. It can be determined according to the specific circumstances and is within the scope of protection of this application.

[0055] S120. When the electromagnetic braking capability of the maglev train does not meet the braking requirement of the maglev train, control the maglev train to perform electromagnetic braking and control the levitation force of the maglev train to reduce so as to meet the above braking requirement.

[0056] The electromagnetic braking capability of a maglev train refers to the maximum braking force or maximum deceleration that the maglev train can obtain during its own electromagnetic braking process.

[0057] It should be noted that the principle of electromagnetic braking of maglev trains is already very mature in the prior art and will not be described in detail here.

[0058] The braking demand of a maglev train refers to the braking force or deceleration required by the maglev train when braking.

[0059] During the movement of the maglev train, the maglev train is in a suspended state. At this time, the maglev train is subject to its own gravity and suspension force, and these two forces are equal in magnitude and opposite in direction, that is, the forces on the maglev train are balanced at this time. Therefore, if the suspension force decreases, the forces on the maglev train are no longer balanced, that is, the maglev train cannot be in a suspended state, so the maglev train begins to descend, and eventually the maglev train will be pressed on the track. When the maglev train is pressed on the track, the maglev train is subject to its own gravity, suspension force, and support force from the track, and the direction of the suspension force is opposite to the gravity, the direction of the support force from the track is the same as the direction of the suspension force, and the sum of the suspension force and the support force from the track is equal to the gravity. Therefore, the forces on the maglev train are balanced again at this time.

[0060] Since the maglev train will eventually press on the track after the suspension force of the maglev train is reduced, the maglev train will generate a differential friction force between the maglev train and the track during the movement of the maglev train, so the maglev train can use this friction force for braking. In addition, when the electromagnetic braking capacity of the maglev train does not meet the braking requirements of the maglev train, the maglev train is controlled to perform electromagnetic braking and the suspension force of the maglev train is controlled to be reduced to meet the above braking requirements. In this case, the maglev train can use both electromagnetic force and friction force for braking, that is, the maglev train can obtain greater braking force, thereby increasing the possibility of meeting the above braking requirements. Therefore, the braking method of the maglev train improves the braking reliability of the maglev train.

[0061] It should be noted that, in practical applications, the method of braking using the differential friction between the maglev train and the track can be called landing braking.

[0062] Another embodiment of the present application provides a specific implementation of step S120, and the specific process is as follows: Figure 2 As shown, the specific steps include:

[0063] S210, controlling the maglev train to perform electromagnetic braking to meet the above braking requirements.

[0064] Controlling the maglev train to perform electromagnetic braking to meet the above braking requirement is equivalent to: controlling the maglev train to perform electromagnetic braking, and the braking force or deceleration provided by the electromagnetic braking is equal to: the braking force or deceleration required by the maglev train when braking.

[0065] It should be noted that the above braking requirements have been described in detail in the above embodiments and will not be repeated here.

[0066] Since the braking force or deceleration provided by the electromagnetic brake is less than or equal to the maximum braking force or maximum deceleration that the maglev train can obtain during its own electromagnetic braking process, if the braking force or deceleration required by the maglev train when braking is too large, the braking force or deceleration provided by the electromagnetic brake is no longer equal to: the braking force or deceleration required by the maglev train when braking, but is equal to the maximum braking force or maximum deceleration that the maglev train can obtain during its own electromagnetic braking process.

[0067] S220: Determine whether the electromagnetic braking capacity meets the braking requirement.

[0068] If the electromagnetic braking capacity does not meet the braking requirement, step S230 is executed; if the electromagnetic braking capacity meets the braking requirement, the braking method of the maglev train is stopped.

[0069] It should be noted that the above electromagnetic braking capability and the above braking requirement have been described in detail in the above embodiments and will not be repeated here.

[0070] S230, controlling the levitation force of the maglev train to reduce so as to meet the above braking requirement.

[0071] Controlling the levitation force of the maglev train to reduce so as to meet the above-mentioned braking demand is equivalent to: controlling the maglev train to brake through the friction force generated between the maglev train and the track, that is, controlling the maglev train to perform landing braking, and the braking force or deceleration provided by the landing braking is equal to: the above-mentioned braking demand minus the above-mentioned electromagnetic braking capacity, that is, equal to: the braking force or acceleration required by the maglev train during braking minus the maximum braking force or maximum deceleration provided by the electromagnetic brake.

[0072] In summary, if the above braking demand is large, that is, the above electromagnetic braking capacity does not meet the above braking demand, then both electromagnetic braking and vehicle-dropping braking are performed, and the braking force or deceleration provided by the electromagnetic braking is equal to: the maximum braking force or maximum deceleration that the maglev train can obtain during its own electromagnetic braking process, and the braking force or deceleration provided by the vehicle-dropping braking is equal to: the braking force or acceleration required by the maglev train during braking minus the maximum braking force or maximum deceleration provided by the electromagnetic braking. If the above braking demand is not large, that is, the above electromagnetic braking capacity meets the above braking demand, then only electromagnetic braking is performed, and the braking force or deceleration provided by the electromagnetic braking is equal to: the braking force or deceleration required by the maglev train during braking.

[0073] Another embodiment of the present application provides another specific implementation of step S120, and its specific process is as follows: Figure 3 As shown, the specific steps include:

[0074] S310: Determine whether the electromagnetic braking capacity meets the braking requirement.

[0075] If the electromagnetic braking capacity meets the braking requirement, step S320 is executed; if the electromagnetic braking capacity does not meet the braking requirement, steps S330 and S340 are executed.

[0076] It should be noted that the above electromagnetic braking capability and the above braking requirement have been described in detail in the above embodiments and will not be repeated here.

[0077] S320, controlling the maglev train to perform electromagnetic braking to meet the above braking requirements.

[0078] It should be noted that step S320 is the same as step S210. Please refer to the detailed description of step S210 in the above embodiment, which will not be repeated here.

[0079] Since step S320 is executed when the electromagnetic braking capacity meets the braking requirement, that is, when the braking requirement is not large, after executing step S320, the braking force or deceleration provided by the electromagnetic braking is always equal to the braking force or deceleration required by the maglev train when braking.

[0080] S330, controlling the maglev train to perform electromagnetic braking.

[0081] In a specific example, the maglev train is controlled to perform maximum electromagnetic braking.

[0082] Controlling the maglev train to perform maximum electromagnetic braking is equivalent to controlling the maglev train to perform electromagnetic braking, and the braking force or deceleration provided by the electromagnetic braking is equal to the maximum braking force or maximum deceleration that the maglev train can obtain during its own electromagnetic braking process.

[0083] The above example only shows a specific implementation of step S330. In practical applications, including but not limited to this, for example, controlling the maglev train to perform electromagnetic braking less than the maximum degree is not specifically limited here and can be determined according to the specific circumstances, all of which are within the scope of protection of this application.

[0084] S340, controlling the levitation force of the maglev train to reduce so as to meet the above braking requirement.

[0085] Controlling the levitation force of the maglev train to reduce so as to meet the above-mentioned braking requirements is equivalent to: controlling the maglev train to brake through the friction force generated between the maglev train and the track, that is, controlling the maglev train to perform landing braking, and the braking force or deceleration provided by the landing braking is equal to: the braking force or acceleration required by the maglev train during braking minus the braking force or deceleration provided by the electromagnetic brake in step S330.

[0086] In summary, if the above braking demand is large, that is, the above electromagnetic braking capacity does not meet the above braking demand, then both electromagnetic braking and vehicle-dropping braking are performed, and the sum of the braking force or deceleration provided by this electromagnetic braking and the braking force or deceleration provided by the vehicle-dropping braking is equal to: the braking force or acceleration required by the maglev train when braking. If the above braking demand is not large, that is, the above electromagnetic braking capacity meets the above braking demand, then only electromagnetic braking is performed, and the braking force or deceleration provided by the electromagnetic braking is equal to: the braking force or deceleration required by the maglev train when braking.

[0087] Another embodiment of the present application provides an implementation of step S230 or step S340, and the specific process is as follows: Figure 4 (by Figure 2 As shown in the example, the specific steps include:

[0088] S410: According to the difference between the braking demand and the actual braking capacity of the maglev train, the set value of the excitation current of the electromagnet in the maglev train is adjusted.

[0089] It should be noted that the above braking requirements have been described in detail in the above embodiments and will not be repeated here.

[0090] The above-mentioned actual braking capacity refers to: the maximum braking force or maximum deceleration actually obtained by the maglev train during its own braking process.

[0091] It should be noted that the setting value of the excitation current of the electromagnet is already very common in the prior art and will not be described in detail here.

[0092] S420, adjusting the measured value of the input voltage of the electromagnet according to the difference between the set value and the measured value of the excitation current of the electromagnet.

[0093] It should be noted that the measured value of the exciting current of the electromagnet and the measured value of the input voltage of the electromagnet are already very common in the prior art and will not be described in detail here.

[0094] In practical applications, when the measured value of the input voltage of the electromagnet changes, the electromagnetic force of the electromagnet changes, that is, the levitation force of the maglev train changes. As for the relationship between the levitation force of the maglev train and the input voltage of the electromagnet, it is very common in the prior art and will not be repeated here.

[0095] From the above, it can be seen that when the input voltage of the electromagnet is stable, that is, when the levitation force of the maglev train is stable, the difference between the set value and the measured value of the excitation current of the electromagnet is equal to zero, that is, the measured value of the excitation current of the electromagnet is equal to the set value, and therefore the difference between the above braking demand and the above actual braking capacity is equal to zero, that is, the above actual braking capacity is equal to the above braking demand, so that the above braking demand can be met at this time.

[0096] Another embodiment of the present application provides an implementation of step S220 or step S310, and the specific process is as follows: Figure 5 (by Figure 4 As shown in the example, the specific steps include:

[0097] S510: Determine whether the required braking force of the maglev train is greater than the maximum electromagnetic braking force.

[0098] If the required braking force is greater than the maximum electromagnetic braking force, step S520 is executed; if the required braking force is less than or equal to the maximum electromagnetic braking force, step S530 is executed.

[0099] The above-mentioned maximum electromagnetic braking force refers to the maximum braking force obtained by the maglev train during its own electromagnetic braking process.

[0100] The above-mentioned required braking force refers to the braking force required by the maglev train when braking.

[0101] S520: Determine that the electromagnetic braking capacity does not meet the braking requirement.

[0102] S530: Determine whether the electromagnetic braking capacity meets the braking requirement.

[0103] Normally, if the maximum braking force obtained by the maglev train during its own electromagnetic braking process is greater than or equal to the braking force required by the maglev train during braking, it is considered that the above electromagnetic braking capacity meets the above braking requirement. In addition, since the above maximum electromagnetic braking force refers to the maximum braking force obtained by the maglev train during its own electromagnetic braking process, and the above required braking force refers to the braking force required by the maglev train during braking, in this embodiment, when the above required braking force is less than or equal to the above maximum electromagnetic braking force, it can be determined that the above electromagnetic braking capacity meets the above braking requirement.

[0104] Another embodiment of the present application provides another implementation of step S220 or step S310, and the specific process is as follows: Figure 6 (by Figure 4 As shown in the example, the specific steps include:

[0105] S610: Determine whether the required deceleration of the maglev train is greater than the maximum electromagnetic deceleration.

[0106] If the required deceleration is greater than the maximum electromagnetic deceleration, step S620 is executed; if the required deceleration is less than or equal to the maximum electromagnetic deceleration, step S630 is executed.

[0107] The above-mentioned maximum electromagnetic deceleration refers to the maximum deceleration obtained by the maglev train during its own electromagnetic braking process.

[0108] The required deceleration mentioned above refers to the deceleration required for the maglev train when braking.

[0109] S620: Determine that the electromagnetic braking capacity does not meet the braking requirement.

[0110] S630: Determine whether the electromagnetic braking capacity meets the braking requirement.

[0111] Generally, if the maximum deceleration obtained by the maglev train during its own electromagnetic braking is greater than or equal to the deceleration required by the maglev train during braking, it is considered that the electromagnetic braking capacity meets the braking requirement. Since the maximum electromagnetic deceleration is the maximum deceleration obtained by the maglev train during its own electromagnetic braking, and the required deceleration is the deceleration required by the maglev train during braking, in this embodiment, when the required deceleration is less than or equal to the maximum electromagnetic deceleration, it can be determined that the electromagnetic braking capacity meets the braking requirement.

[0112] Another embodiment of the present application provides another specific implementation of step S120, and its specific process is as follows: Figure 7 (by Figure 2 This implementation mode further includes the following steps before step S230 or step S340 in the above implementation mode:

[0113] S710, controlling the suspension gap of the maglev train to be stable at a first target value.

[0114] The absolute value of the difference between the first target value and the maximum value of the suspension gap is less than the first preset value and greater than zero. In other words, the absolute value of the difference between the first target value and the maximum value of the suspension gap is less than the first preset value and greater than zero. In addition, the maximum value of the suspension gap is set during the design process of the maglev train and is not specifically limited here.

[0115] It should be noted that if Fig. 9 As shown, 01 is the maglev train, 02 is the structure of the maglev train and the track, 03 is the track, and d is the above-mentioned suspension gap.

[0116] The absolute value of the difference between the first target value and the maximum value of the suspension gap is less than the first preset value, indicating that the absolute value of the difference between the first target value and the maximum value of the suspension gap is a smaller value. In other words, the first target value is close to the maximum value of the suspension gap, that is, Fig. 9 The suspension distance D of the maglev train is close to zero, that is, the landing distance of the maglev train is small. In practical applications, the first preset value is set according to actual conditions and is not specifically limited here.

[0117] In this embodiment, before the suspension force of the maglev train is controlled to be reduced to meet the above braking requirement, that is, before the maglev train is controlled to brake, Fig. 9 The suspension distance D of the maglev train is close to zero, which makes the landing distance of the maglev train smaller, thus reducing the impact caused by the landing brake, thereby improving the comfort of the maglev train. In addition, it also improves the overall safety of the maglev train and can also avoid the phenomenon of being sucked in due to the large current of the landing brake.

[0118] Another embodiment of the present application provides an implementation of step S710, and the specific process is as follows: Figure 8 As shown, the specific steps include:

[0119] S810: Adjust the measured value of the suspension gap according to the set value of the suspension gap.

[0120] It should be noted that the above suspension gap has been described in detail in the above embodiment and will not be described again here. In addition, the setting value of the above suspension gap and the measurement value of the above suspension gap are already very common in the prior art and will not be described again in detail here.

[0121] The setting value of the above suspension gap is the smaller value between the first target value and the transition value.

[0122] The transition value is positively correlated with the duration of the levitation force reduction of the maglev train. Specifically, the relationship between the transition value and the duration of the levitation force reduction of the maglev train is as follows: Zd=r×t+Z0. t is the duration of the levitation force reduction of the maglev train. Z0 is the actual value of the above-mentioned suspension gap when the levitation force reduction of the maglev train begins to be controlled, that is, the actual value of the above-mentioned suspension gap when the maglev train is only controlled to perform electromagnetic braking.

[0123] In this embodiment, since the setting value of the above-mentioned suspension gap is the smaller value between the first target value and the transition value, and the transition value is positively correlated with the duration of the reduction of the suspension force of the maglev train, the setting value of the above-mentioned suspension gap changes with the duration of the reduction of the suspension force of the maglev train, so that the above-mentioned suspension gap gradually increases, that is, the maglev train gradually falls, thereby optimizing the riding experience of the maglev train alighting process, and further improving the comfort of the maglev train.

[0124] Another embodiment of the present application provides another implementation of the braking method of a maglev train. Based on the above implementation, this implementation further includes:

[0125] S910. During the travel of the maglev train, control the suspension gap of the maglev train to be stable at a second target value.

[0126] It should be noted that the above suspension gap has been described in detail in the above embodiment and will not be described again here. In addition, the setting value of the above suspension gap and the measurement value of the above suspension gap are already very common in the prior art and will not be described again in detail here.

[0127] The second target value is a value smaller than the second preset value and greater than zero. In other words, the second target value is smaller than the second preset value and greater than zero.

[0128] The second target value is less than the second preset value, indicating that the second target value is a smaller value. In other words, the second target value is close to zero, that is, Fig. 9 The suspension distance D of the maglev train shown is close to the design value. In practical applications, the second preset value is set according to actual conditions and is not specifically limited here.

[0129] It should be noted that controlling the suspension gap of the maglev train to be stable at the second target value is already very mature in the prior art and will not be described in detail here.

[0130] In this embodiment, the suspension gap of the maglev train is controlled to be stable at the second target value during the travel of the maglev train, so that the suspension gap D of the maglev train is close to the design value, thereby allowing the maglev train to run safely.

[0131] Another embodiment of the present application provides a maglev train, which is used to achieve braking by executing the braking method of the maglev train provided in the above embodiment.

[0132] It should be noted that the braking method of the maglev train is applicable to maglev trains of different types, such as electromagnetic, permanent magnet electromagnetic hybrid, etc., and has strong universality.

[0133] For the above description of the disclosed embodiments, the features recorded in each embodiment in this specification can be replaced or combined with each other, so that professionals in the field can implement or use the present application. The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with a preferred embodiment, it is not used to limit the present invention. Any technician familiar with the field can make many possible changes and modifications to the technical solution of the present invention using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A braking method for a maglev train, characterized in that: include: During the travel of the maglev train, determining whether the maglev train needs to be braked; If the maglev train needs to be braked, when the electromagnetic braking capacity of the maglev train does not meet the braking requirement of the maglev train, the maglev train is controlled to perform electromagnetic braking and the suspension force of the maglev train is controlled to be reduced to meet the braking requirement.

2. The braking method of a maglev train according to claim 1, characterized in that: When the electromagnetic braking capability of the maglev train does not meet the braking requirement of the maglev train, controlling the maglev train to perform electromagnetic braking and controlling the levitation force of the maglev train to reduce so as to meet the braking requirement, comprises: Controlling the magnetic levitation train to perform electromagnetic braking to meet the braking requirement; Determining whether the electromagnetic braking capacity meets the braking requirement; If the electromagnetic braking capacity does not meet the braking requirement, the suspension force of the magnetic levitation train is controlled to be reduced to meet the braking requirement.

3. The braking method of a maglev train according to claim 1, characterized in that: When the electromagnetic braking capability of the maglev train does not meet the braking requirement of the maglev train, controlling the maglev train to perform electromagnetic braking and controlling the levitation force of the maglev train to reduce so as to meet the braking requirement, comprises: Determining whether the electromagnetic braking capacity meets the braking requirement; If the electromagnetic braking capacity meets the braking requirement, controlling the maglev train to perform electromagnetic braking to meet the braking requirement; If the electromagnetic braking capacity does not meet the braking requirement, the maglev train is first controlled to perform electromagnetic braking, and then the levitation force of the maglev train is controlled to be reduced to meet the braking requirement.

4. The braking method of a maglev train according to claim 2 or 3, characterized in that: Controlling the levitation force of the magnetic levitation train to reduce to meet the braking demand comprises: According to the difference between the braking demand and the actual braking capacity of the maglev train, adjusting the set value of the excitation current of the electromagnet in the maglev train; The measured value of the input voltage of the electromagnet is adjusted according to the difference between the set value and the measured value of the excitation current of the electromagnet.

5. The braking method of a maglev train according to claim 2 or 3, characterized in that: Determining whether the electromagnetic braking capability meets the braking requirement includes: Determining whether the required braking force of the maglev train is greater than the maximum electromagnetic braking force; the maximum electromagnetic braking force is the maximum braking force obtained by the maglev train during its own electromagnetic braking process; If the required braking force is greater than the maximum electromagnetic braking force, it is determined that the electromagnetic braking capacity does not meet the braking requirement; If the required braking force is less than or equal to the maximum electromagnetic braking force, it is determined that the electromagnetic braking capacity meets the braking requirement.

6. The braking method of a maglev train according to claim 2 or 3, characterized in that: Determining whether the electromagnetic braking capability meets the braking requirement includes: Determine whether the required deceleration of the maglev train is greater than the maximum electromagnetic deceleration; the maximum electromagnetic deceleration is the maximum deceleration obtained by the maglev train during its own electromagnetic braking process; If the required deceleration is greater than the maximum electromagnetic deceleration, it is determined that the electromagnetic braking capacity does not meet the braking requirement; If the required deceleration is less than or equal to the maximum electromagnetic deceleration, it is determined that the electromagnetic braking capacity meets the braking requirement.

7. The braking method of a maglev train according to claim 2 or 3, characterized in that: Before controlling the levitation force of the magnetic levitation train to reduce to meet the braking requirement, the method further includes: The suspension gap of the magnetic levitation train is controlled to be stable at a first target value; the absolute value of the difference between the first target value and the maximum value of the suspension gap is less than a first preset value and greater than zero.

8. The braking method of a maglev train according to claim 7, characterized in that: Controlling the suspension gap of the magnetic levitation train to be stable at a first target value comprises: The measured value of the suspension gap is adjusted according to the set value of the suspension gap; the set value of the suspension gap is the smaller value between the first target value and the transition value; the transition value is positively correlated with the duration of the reduction of the suspension force of the maglev train.

9. The braking method of a maglev train according to any one of claims 1 to 3, characterized in that: Also includes: During the travel of the maglev train, controlling the suspension gap of the maglev train to be stable at a second target value; The second target value is a value that is less than the second preset value and greater than zero.

10. A magnetic levitation train, characterized in that: The maglev train is used to achieve braking by executing the braking method for a maglev train according to any one of claims 1 to 9.

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