CN114043876A - Train braking system based on eddy current braking - Google Patents
Train braking system based on eddy current braking Download PDFInfo
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- CN114043876A CN114043876A CN202111319257.XA CN202111319257A CN114043876A CN 114043876 A CN114043876 A CN 114043876A CN 202111319257 A CN202111319257 A CN 202111319257A CN 114043876 A CN114043876 A CN 114043876A
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- 230000005284 excitation Effects 0.000 claims abstract description 43
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 230000001066 destructive effect Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000002679 ablation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003574 free electron Substances 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L7/00—Electrodynamic brake systems for vehicles in general
- B60L7/28—Eddy-current braking
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2200/00—Type of vehicles
- B60L2200/26—Rail vehicles
Abstract
The embodiment of the invention discloses a train braking system based on eddy current braking, which comprises: an eddy current cut-off loop and N sets of eddy current braking systems; the eddy current braking system includes: the device comprises a brake control device, an excitation power supply, an eddy current brake device and a first circuit breaker, wherein the excitation power supply is connected with the eddy current brake device through the first circuit breaker; the vortex shedding loop includes: the brake control device comprises an interruption line and a state line, wherein N switches which correspond to the brake control devices one to one are arranged on the interruption line, and the state line is in a power-off state when any one switch is in an off state; the first circuit breaker is used for disconnecting the connection between the excitation power supply and the eddy current braking device when the state line is in a power loss state; and the brake control device is used for controlling the corresponding switch to be in an off state when the speed of the corresponding vehicle is lower than a preset value. The invention is helpful for improving the application safety of the eddy current brake device.
Description
Technical Field
The invention relates to the technical field of train braking, in particular to a train braking system based on eddy current braking.
Background
When a bulk metal conductor is placed in an alternating magnetic field, free electrons in the metal are acted by an induced electromotive force generated by the changing magnetic field, so that eddy-like induced current, called eddy current, is formed in the metal. The effect of the induced current is known from lenz's law to always oppose the cause of the induced current, and the braking device designed according to this principle is eddy current braking. The linear eddy current brake uses the steel rail as a magnetic inductor, a long bar magnet is arranged between wheels on two sides of a bogie, N, S poles of the magnet are alternately arranged, and a small vertical distance (air gap) is kept between the pole face and the steel rail face. When the train runs, the magnet and the steel rail generate relative motion, eddy current can be induced on the steel rail through excitation control, and braking force is formed.
The eddy current brake device mainly includes: the coil assembly, the carrier beam, the supporting arm, the dowel bar, the transverse pull rod, the suspension unit and the like form an electromagnet by the coil assembly and the carrier beam.
From the curve of the linear eddy current braking force and the speed characteristic measured in the prior art, the braking force increases rapidly with the increase of the speed at low speed, the braking force reaches the maximum about 100km/h, and then the braking force slightly decreases with the increase of the speed, but the braking force can exert nearly constant braking force in a large speed range (including a high speed). When the speed is lower than about 50km/h, the braking force is quickly attenuated, the vertical suction force is continuously increased, and the self structure and the track state are influenced to a certain extent. Because the load beam of the suspension electromagnet is made of low-carbon steel for magnetic conduction and multiple selection, if the deformation caused by the electromagnetic attraction is too large, the electromagnet and the steel rail can be rubbed, and destructive results are caused. Therefore, it is necessary to ensure reliable withdrawal of the eddy current braking force at low speeds.
FIG. 2 is a block diagram of an eddy current braking system for a prior art bicycle, in which the thick line is the energy transfer path and the thin line is the signal transfer path. When eddy current braking is required to be applied, the braking control device (BCU) sends a command to the eddy current braking control device (WBCU), the eddy current braking control device (WBCU) sends a command to the excitation power supply (WPCU) according to the conversion relation between braking force and current, the excitation power supply (WPCU) receives power supply input from the converter, and regulates given current to be output to the eddy current braking device according to the command, so that braking force is generated.
When the train runs, a Brake Control Unit (BCU), an eddy current brake control unit (WBCU) and an excitation power supply (WPCU) in the eddy current brake system acquire the current bicycle speed of the corresponding train, and when the speed is reduced to be below a specified speed, the following strategies are adopted:
the Brake Control Unit (BCU) no longer applies for an eddy current braking force;
the eddy current brake control unit (WBCU) no longer issues an eddy current available status and capability to the Brake Control Unit (BCU);
the excitation power supply (WPCU) no longer outputs an excitation current.
The above measures can basically ensure reliable cut-off of eddy current braking force at low speed. There are two problems that remain:
1. the adopted speed of the bicycle is detected by the sensor, when the sensor of one vehicle in the train breaks down, the detected speed of the vehicle is inaccurate, so that the eddy current brake of the vehicle is cut off but not cut off, and further, the electromagnet and the steel rail in the eddy current brake device of the vehicle are rubbed, so that destructive results are caused.
2. The ablation action is only present at the electrical command level and no ablation is performed from the energy delivery pathway.
Disclosure of Invention
In order to solve at least one technical problem in the background art, the invention provides a train braking system based on eddy current braking.
In order to achieve the above object, the present invention provides an eddy current brake-based train braking system, comprising: the system comprises an eddy current cutting loop and N sets of eddy current braking systems, wherein N vehicles in the train are respectively provided with a set of corresponding eddy current braking system, N is an integer which is more than or equal to 2 and less than or equal to M, and M is the total number of the vehicles in the train;
the eddy current braking system includes: the device comprises a brake control device, an excitation power supply, an eddy current brake device and a first circuit breaker, wherein the excitation power supply is connected with the eddy current brake device through the first circuit breaker;
the vortex shedding loop comprises: the brake control device comprises an interruption line and a state line, wherein the interruption line is connected with the state line, the interruption line is provided with N switches in one-to-one correspondence with the brake control device, and the state line is in a power-off state when any one switch is in an off state;
the first circuit breaker is used for disconnecting the excitation power supply from the eddy current braking device when the state line is in a power loss state; and the brake control device is used for controlling the corresponding switch to be in an off state when the speed of the corresponding vehicle is lower than a preset value.
Optionally, the eddy current braking system further comprises: the current transformer is connected with the excitation power supply through the second circuit breaker;
and the second circuit breaker is used for disconnecting the converter from the excitation power supply when the state line is in a power-off state.
Optionally, the first circuit breaker is connected to the state line to supply power to the first circuit breaker through the state line, and the first circuit breaker is disconnected when the state line is in a power-off state, so as to disconnect the connection between the excitation power supply and the eddy current braking device.
Optionally, the second circuit breaker is connected to the status line, so as to supply power to the second circuit breaker through the status line, and when the status line is in a power loss state, the second circuit breaker is disconnected, thereby disconnecting the converter from the excitation power supply.
Optionally, the brake control device is further configured to control the corresponding switch to the closed state when the speed of the corresponding vehicle is greater than or equal to the preset value and the corresponding switch is in the open state.
Optionally, one end of the interrupt line is connected to a power supply, and the other end is connected to the status line.
Optionally, the eddy current braking system further comprises: and the eddy current braking control device is respectively connected with the braking control device and the excitation power supply.
Optionally, the braking control device, the eddy current braking control device, and the excitation power supply are all used to collect the speed of the corresponding vehicle.
Optionally, when the speed of the corresponding vehicle is lower than the preset value, the braking control device does not apply for eddy current braking force to the eddy current braking control device any more, the eddy current braking control device does not send out eddy current available state information to the braking control device any more, and the excitation power supply does not output excitation current any more.
Optionally, N is equal to M-a, where a set of eddy current braking systems corresponding to each other is respectively disposed on other vehicles except the power vehicle in the train, and a is the number of power vehicles in the train.
The invention has the beneficial effects that:
according to the invention, by arranging the eddy current cut-off loop, when any vehicle in the train cuts off the eddy current braking force, other vehicles also cut off the eddy current braking at the same time, so that the problem of destructive consequences caused by that the eddy current braking force is cut off but not cut off due to the fault of a single vehicle sensor is avoided. In addition, the connection between the excitation power supply and the eddy current braking device is disconnected through the first circuit breaker when the eddy current braking force is cut off, and the cutting off is carried out from an energy transmission path, so that the safety is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts. In the drawings:
FIG. 1 is a schematic view of an eddy current braking based train braking system according to an embodiment of the present invention;
FIG. 2 is a schematic view of a prior art bicycle eddy current braking system.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terms "comprises" and "comprising," and any variations thereof, in the description and claims of the present invention and the above-described drawings are intended to cover a non-exclusive inclusion, such that a system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other elements not expressly listed or inherent to such article or apparatus.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In one embodiment of the present invention, the eddy current brake-based train braking system of the present invention comprises: the eddy current cutting-off system comprises an eddy current cutting-off loop and N sets of eddy current braking systems, wherein the N vehicles in the train are respectively provided with a set of corresponding eddy current braking systems, N is an integer which is greater than or equal to 2 and less than or equal to M, and M is the total number of the vehicles in the train.
It should be noted that the train of the present invention is composed of a plurality of vehicles (which may also be referred to as cars), and the vehicles of the present invention are cars in the sense of passengers, but in the art, the cars understood by passengers are generally referred to as cars or vehicles. For example, as shown in fig. 1, a train includes a plurality of vehicles including a front vehicle, a middle vehicle, and a rear vehicle.
In one embodiment of the invention, a set of eddy current brake system is respectively arranged on a part of vehicles in the train. The eddy current braking system of the present invention may also be referred to as a single vehicle eddy current braking system, where a single vehicle refers to a single vehicle.
In another embodiment of the present invention, each vehicle in the train is provided with a corresponding set of eddy current braking systems, i.e. N is equal to M.
In another embodiment of the invention, the vehicles except the power vehicle in the train are respectively provided with a corresponding set of eddy current brake systems, namely N is equal to M-A, A is the number of power vehicles in the train, and the number of power vehicles A is generally 1.
In one embodiment of the invention, the eddy current braking system comprises: braking controlling means, excitation power supply, eddy current arresting gear and first circuit breaker, the excitation power supply pass through first circuit breaker with eddy current arresting gear is connected.
The vortex shedding loop comprises: the brake control device comprises an interruption line and a state line, wherein the interruption line is connected with the state line, as shown in fig. 1, the interruption line is provided with N switches (interruption in fig. 1) corresponding to the brake control devices one by one, and when any one switch is in an off state, the state line is in a power-off state. As shown in fig. 1, the N switches are connected in series on the interrupt line.
In one embodiment of the present invention, the interrupt line and the state line penetrate through each train of the train, the interrupt line is provided with a switch on the train provided with the eddy current braking system, the switch is connected with a brake control device on the corresponding train, and the brake control device is used for controlling the on-off state of the corresponding switch.
And the brake control device is used for controlling the corresponding switch to be in an off state when the speed of the corresponding vehicle is lower than a preset value. The first circuit breaker is used for disconnecting the excitation power supply from the eddy current braking device when the state line is in a power loss state.
Therefore, when the eddy current braking force is cut off, the cutting-off is carried out from the energy transmission path, and the safety is further improved. In addition, when any one of the N eddy current brake systems cuts off the eddy current brake force, all other eddy current brake systems can also cut off the eddy current brake force at the same time through the arrangement of the eddy current cutting-off loop, so that the problem that a certain vehicle originally cuts off the eddy current brake force but does not cut off the eddy current brake force due to the fault of a single vehicle sensor and the destructive consequence is caused is avoided.
In the embodiment of the present invention, the preset value may be set according to an actual situation, for example, may be set to 50 km/h.
In one embodiment of the invention, as shown in fig. 1, one end of the interrupt line is connected to a power source and the other end is connected to the status line. Thus, when any one of the switches in the interrupt line is in an off state, electricity cannot be transmitted to the state line, and therefore the state line is in a power-off state.
In one embodiment of the present invention, the eddy current braking system further comprises: the current transformer is connected with the excitation power supply through the second circuit breaker. And the second circuit breaker is used for disconnecting the converter from the excitation power supply when the state line is in a power-off state.
When the eddy current braking force is cut off, the energy transmission path from the converter to the excitation power supply is cut off, so that the safety is further improved.
In one embodiment of the invention, the first circuit breaker is connected to the status line to supply power to the first circuit breaker via the status line, and the first circuit breaker is opened when the status line is in a power-off state, thereby achieving disconnection between the excitation power supply and the eddy current braking device.
In one embodiment of the invention, the second circuit breaker is connected to the status line to supply power to the second circuit breaker through the status line, and the second circuit breaker is opened when the status line is in a power-off state, thereby achieving disconnection between the converter and the excitation power supply.
In the present invention, the first circuit breaker and the second circuit breaker are powered by the status line, and both the first circuit breaker and the second circuit breaker include: the circuit breaker comprises a first circuit breaker and a second circuit breaker, wherein the first circuit breaker and the second circuit breaker are in an on state when the first circuit breaker and the second circuit breaker are electrified, and the first circuit breaker and the second circuit breaker are in an off state when the first circuit breaker and the second circuit breaker are powered off. The on state means that the circuit breaker is considered as a circuit and the off state means that the circuit breaker is considered as a circuit break.
In an embodiment of the invention, the brake control device is further configured to control the corresponding switch to the closed state when the speed of the corresponding vehicle is greater than or equal to the preset value and the corresponding switch is in the open state.
In one embodiment of the present invention, as shown in fig. 1, the eddy current braking system further comprises: and the eddy current braking control device is respectively connected with the braking control device and the excitation power supply.
In one embodiment of the invention, the brake control device, the eddy current brake control device and the excitation power supply are all used for collecting the speed of the corresponding vehicle. Specifically, the braking control device, the eddy current braking control device, and the excitation power supply collect the vehicle speed through a sensor provided on the corresponding vehicle.
In one embodiment of the invention, when the speed of the corresponding vehicle is lower than the preset value, the brake control device does not apply eddy current brake force to the eddy current brake control device any more, the eddy current brake control device does not send out eddy current available state information to the brake control device any more, and the excitation power supply does not output excitation current any more.
Compared with the prior art, the scheme of the invention can directly cut off the power supply circuit of the eddy current brake through the electrical equipment except that the eddy current brake can be cut off through a command, thereby improving at least one level of safety level of the cutting function. The damage problem caused by the low-speed application of the eddy current braking device to the steel rail and the bogie can be greatly avoided.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An eddy current brake based train braking system, comprising: the system comprises an eddy current cutting loop and N sets of eddy current braking systems, wherein N vehicles in the train are respectively provided with a set of corresponding eddy current braking system, N is an integer which is more than or equal to 2 and less than or equal to M, and M is the total number of the vehicles in the train;
the eddy current braking system includes: the device comprises a brake control device, an excitation power supply, an eddy current brake device and a first circuit breaker, wherein the excitation power supply is connected with the eddy current brake device through the first circuit breaker;
the vortex shedding loop comprises: the brake control device comprises an interruption line and a state line, wherein the interruption line is connected with the state line, the interruption line is provided with N switches in one-to-one correspondence with the brake control device, and the state line is in a power-off state when any one switch is in an off state;
the first circuit breaker is used for disconnecting the excitation power supply from the eddy current braking device when the state line is in a power loss state; and the brake control device is used for controlling the corresponding switch to be in an off state when the speed of the corresponding vehicle is lower than a preset value.
2. The eddy current brake based train braking system as claimed in claim 1, wherein the eddy current braking system further comprises: the current transformer is connected with the excitation power supply through the second circuit breaker;
and the second circuit breaker is used for disconnecting the converter from the excitation power supply when the state line is in a power-off state.
3. An eddy current brake based train braking system according to claim 1, wherein the first circuit breaker is connected to the status line to supply power to the first circuit breaker through the status line, the first circuit breaker being open when the status line is in a de-energized state, thereby effecting disconnection between the excitation power supply and the eddy current braking device.
4. An eddy current brake based train braking system according to claim 2, wherein the second circuit breaker is connected to the status line to supply power to the second circuit breaker via the status line, the second circuit breaker being open when the status line is in a de-energized state, thereby effecting disconnection between the converter and the excitation power source.
5. The eddy current brake based train braking system according to claim 1, wherein the brake control device is further configured to control the corresponding switch to the closed state when the speed of the corresponding vehicle is greater than or equal to the preset value and the corresponding switch is in the open state.
6. The eddy current brake-based train brake system according to claim 1, wherein one end of the interruption line is connected to a power source, and the other end is connected to the status line.
7. The eddy current brake based train braking system as claimed in claim 1, wherein the eddy current braking system further comprises: and the eddy current braking control device is respectively connected with the braking control device and the excitation power supply.
8. Eddy current brake based train braking system according to claim 7, characterized in that the brake control means, the eddy current brake control means and the excitation power supply are all used to capture the speed of the corresponding vehicle.
9. The eddy current brake-based train braking system according to claim 8, wherein when the speed of the corresponding vehicle is lower than the preset value, the brake control device does not apply an eddy current braking force to the eddy current brake control device any more, the eddy current brake control device does not send out the eddy current available state information to the brake control device any more, and the exciting power supply does not output an exciting current any more.
10. Eddy current brake based train braking system according to claim 1, wherein N is equal to M-a, wherein each of the other vehicles of the train than the powered vehicle is provided with a respective set of eddy current braking systems, a being the number of powered vehicles in the train.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111319257.XA CN114043876B (en) | 2021-11-09 | 2021-11-09 | Train braking system based on eddy current braking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111319257.XA CN114043876B (en) | 2021-11-09 | 2021-11-09 | Train braking system based on eddy current braking |
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| CN114043876A true CN114043876A (en) | 2022-02-15 |
| CN114043876B CN114043876B (en) | 2024-01-26 |
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| CN114043876B (en) | 2024-01-26 |
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