CN114043876B - Train braking system based on eddy current braking - Google Patents
Train braking system based on eddy current braking Download PDFInfo
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- CN114043876B CN114043876B CN202111319257.XA CN202111319257A CN114043876B CN 114043876 B CN114043876 B CN 114043876B CN 202111319257 A CN202111319257 A CN 202111319257A CN 114043876 B CN114043876 B CN 114043876B
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- 230000005284 excitation Effects 0.000 claims abstract description 39
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 4
- 230000001066 destructive effect Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 230000002238 attenuated 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
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003574 free electron Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The embodiment of the invention discloses a train braking system based on eddy current braking, which comprises: an eddy current cutting 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: an interrupt line and a state line, wherein N switches which are in one-to-one correspondence with the brake control devices are arranged on the interrupt line, and the state line is in a power-off state when any one switch is in a disconnection state; the first circuit breaker is used for disconnecting the excitation power supply from the eddy current braking device when the state wire is in a power-off state; 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 beneficial to 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 subjected to induced electromotive force generated by the changing magnetic field, thereby forming eddy-like induced currents in the metal, referred to as eddy currents. According to Lenz's law, the effect of induced current always resists the cause of induced current, and the braking device designed according to the principle is used for eddy current braking. The linear vortex brake uses steel rail as magnetic inductor, and a length bar magnet is installed between wheels on two sides of bogie, N, S poles of magnet are alternatively arranged, and the vertical distance (air gap) between pole face and steel rail face is kept small. When the train runs, the magnet and the steel rail generate relative motion, and eddy current can be induced on the steel rail through excitation control to form braking force.
The eddy current brake configuration mainly includes: the coil assembly, the load beam, the support arm, the dowel bar, the transverse pull rod, the suspension unit and the like form an electromagnet by the coil assembly and the load beam.
As is known from the existing actually measured linear vortex braking force and speed characteristic curve, the braking force rapidly increases with the speed at low speed, the braking force reaches the maximum about 100km/h, and then slightly decreases with the speed, but can exert nearly constant braking force in a large speed range (including very high speed). When the speed is lower than about 50km/h, the braking force is quickly attenuated and the vertical suction force is continuously increased, so that the self structure and the track state are affected to a certain extent. Because the carrier beam of the suspended electromagnet is mostly made of low carbon steel for magnetic conduction, if the deformation caused by electromagnetic attraction is overlarge, friction between the electromagnet and a steel rail can be possibly caused, and destructive results are caused. It is therefore desirable to be able 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 of a prior art bicycle, with thick lines being the energy transfer path and thin lines being the signal transfer path. When the eddy current braking is required to be applied, a Braking Control Unit (BCU) gives an instruction to an eddy current braking control unit (WBCU), the eddy current braking control unit (WBCU) gives an instruction to an excitation power supply (WPCU) according to the conversion relation between the braking force and the current, the excitation power supply (WPCU) receives a power input from a converter, and a given current is regulated according to the instruction and output to the eddy current braking unit, so that the braking force is generated.
When the train runs, a brake control device (BCU), an eddy current brake control device (WBCU) and an excitation power supply (WPCU) in the eddy current brake system can acquire the current bicycle speed of the corresponding train, and when the speed is reduced to be lower than a specified speed, the following strategy is adopted:
the Brake Control Unit (BCU) no longer applies an eddy current braking force;
the eddy current brake control unit (WBCU) no longer sends eddy current usable status and capability to the Brake Control Unit (BCU);
the excitation power supply (WPCU) no longer outputs excitation current.
The above measures basically ensure reliable cut-off of the eddy current braking force at low speeds. There are still two problems:
1. the speed of the bicycle is obtained by detecting the speed of the bicycle by a sensor, and when the sensor of one bicycle in the train fails, the detected speed of the bicycle is inaccurate, so that eddy current braking of the bicycle can be possibly caused, but the bicycle is not cut off, and further, an electromagnet and a steel rail in the eddy current braking device of the bicycle can be possibly caused to generate friction, so that destructive consequences are caused.
2. The cutting action is only present at the electrical command level, and is not performed from the energy transmission path.
Disclosure of Invention
The invention provides a train braking system based on eddy current braking in order to solve at least one technical problem in the background art.
In order to achieve the above object, the present invention provides a train brake system based on eddy current braking, the system comprising: the system comprises an eddy current cutting loop and N sets of eddy current braking systems, wherein N sets of eddy current braking systems corresponding to each other are respectively arranged on N vehicles in a train, 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 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 interrupt wire and a state wire, wherein the interrupt wire is connected with the state wire, N switches which are in one-to-one correspondence with the brake control device are arranged on the interrupt wire, and the state wire 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 wire is in a power-off 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 connection between the current transformer and the excitation power supply when the state wire is in a power-off state.
Optionally, the first circuit breaker is connected with the state line, so as 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, thereby realizing disconnection between the excitation power supply and the eddy current braking device.
Optionally, the second circuit breaker is connected with the status line, so as to supply power to the second circuit breaker through the status line, and the second circuit breaker is disconnected when the status line is in a power-off state, thereby realizing disconnection between the converter and the excitation power supply.
Optionally, the braking 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 wire is connected with a power supply, and the other end of the interrupt wire is connected with the status wire.
Optionally, the eddy current braking system further comprises: and the eddy current brake control device is respectively connected with the brake control device and the excitation power supply.
Optionally, the braking control device, the eddy current braking control device and the exciting power supply are all used for collecting the speed of the corresponding vehicle.
Optionally, when the speed of the corresponding vehicle is lower than the preset value, the braking control device no longer applies an eddy current braking force to the eddy current braking control device, the eddy current braking control device no longer sends eddy current available state information to the braking control device, and the excitation power supply no longer outputs excitation current.
optionally,NisequaltoM-a,whereeachsetofeddycurrentbrakingsystemsisrespectivelydisposedonavehicleotherthanthepoweredvehicleinthetrain,andaisthenumberofpoweredvehiclesinthetrain.
The beneficial effects of the invention are as follows:
according to the invention, by arranging the vortex shedding loop, when any one vehicle in the train shedding vortex braking force, other vehicles also shedding vortex braking simultaneously, so that the problem that destructive results are caused because the vortex braking force is not shed due to the fault of the single vehicle sensor is avoided. In addition, when the eddy current braking force is cut off, the first circuit breaker cuts off the connection between the exciting power supply and the eddy current braking device, so that the energy transmission path is cut off, and 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 that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. In the drawings:
FIG. 1 is a schematic diagram of a train brake system based on eddy current braking in accordance with an embodiment of the invention;
FIG. 2 is a schematic diagram of a prior art bicycle eddy current brake system.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "comprising" and "having" and any variations thereof in the description and claims of the present invention and in the foregoing figures 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, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
In one embodiment of the present invention, the eddy current brake based train brake system of the present invention comprises: the system comprises an eddy current cutting loop and N sets of eddy current braking systems, wherein N sets of eddy current braking systems corresponding to each other are respectively arranged on N vehicles in a train, 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 vehicles in the train.
The train of the present invention is composed of a plurality of vehicles (which may be also referred to as vehicles), and the vehicles of the present invention are cars in the sense of passengers, but in the art, cars understood by passengers are generally referred to as vehicles or vehicles. For example, as shown in fig. 1, a train includes a plurality of vehicles, a front vehicle, an intermediate vehicle, and a rear vehicle.
In one embodiment of the invention, a set of eddy current braking systems are respectively arranged on a part of vehicles in the train. The set of eddy current braking systems of the present invention may also be referred to as a single car eddy current braking system, a single car referring to a vehicle.
In another embodiment of the invention, each vehicle in the train is provided with a respective set of eddy current braking systems, i.e. N is equal to M.
inanotherembodimentofthepresentinvention,asetofeddycurrentbrakingsystemscorrespondingtoeachotherisprovidedoneachofthevehiclesotherthanthepoweredvehicleinthetrain,i.e.,NisequaltoM-a,aisthenumberofpoweredvehiclesinthetrain,andthenumberaofpoweredvehiclesistypically1.
In one embodiment of the invention, the eddy current braking system comprises: the braking control device, excitation power supply, vortex arresting gear and first circuit breaker, excitation power supply pass through first circuit breaker with vortex arresting gear connects.
The vortex shedding loop comprises: the brake control device comprises an interrupt line and a state line, wherein the interrupt line is connected with the state line, N switches (interrupt in fig. 1) which are in one-to-one correspondence with the brake control device are arranged on the interrupt line as shown in fig. 1, and the state line is in a power-off state when any one switch is in an off state. As shown in fig. 1, the N switches are connected in series on an interrupt line.
In one embodiment of the invention, the interrupt line and the status line penetrate each car of the train, and the interrupt line is provided with a switch on the car provided with the eddy current braking system, the switch is connected with a braking control device on the corresponding car, and the braking control device is used for controlling the opening and closing states 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. And the first circuit breaker is used for disconnecting the excitation power supply from the eddy current braking device when the state wire is in a power-off state.
Therefore, when the eddy current braking force is cut off, the energy transmission path is cut off, and the safety is further improved. In addition, when any one of the N eddy current braking systems cuts off the eddy current braking force, through the arrangement of the eddy current cutting loop, all other eddy current braking systems cut off the eddy current braking force at the same time, so that the problem that a certain vehicle cuts off the eddy current braking force but is not cut off and destructive results are caused due to the failure of a single vehicle sensor is avoided.
In the embodiment of the invention, the preset value can be set according to practical situations, for example, 50km/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 the off state, electricity cannot be transferred to the status line, and thus the status line is in the 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 connection between the current transformer and the excitation power supply when the state wire is in a power-off state.
When the eddy current braking force is cut off, the energy transmission path between the current transformer and 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 through the status line, and the first circuit breaker is disconnected when the status line is in a power-off state, thereby disconnecting the excitation power supply from 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 disconnected when the status line is in a power-off state, thereby realizing disconnection between the current transformer and the exciting power supply.
In the invention, the first breaker and the second breaker are powered through the status line, and the first breaker and the second breaker comprise: the circuit breaker comprises an off state and an on state, wherein when the first circuit breaker and the second circuit breaker are electrified, the first circuit breaker and the second circuit breaker are both in the on state, and when the first circuit breaker and the second circuit breaker are powered off, the first circuit breaker and the second circuit breaker are both in the off state. The on state refers to the circuit breaker being regarded as a path, and the off state refers to the circuit breaker being regarded as a circuit breaker.
In one embodiment of the present invention, the brake control device is further configured to control the corresponding switch to be switched 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.
As shown in fig. 1, in one embodiment of the present invention, the eddy current braking system further comprises: and the eddy current brake control device is respectively connected with the brake control device and the excitation power supply.
In one embodiment of the present invention, the braking control device, the eddy current braking control device, and the excitation power source are each configured to collect a corresponding vehicle speed. Specifically, the braking control device, the eddy current braking control device and the exciting power supply collect vehicle speeds through sensors arranged on corresponding vehicles.
In one embodiment of the present invention, when the speed of the corresponding vehicle is lower than the preset value, the braking control device no longer applies an eddy current braking force to the eddy current braking control device, the eddy current braking control device no longer sends eddy current usable state information to the braking control device, and the exciting power supply no longer outputs exciting current.
Compared with the prior art, the scheme of the invention has the advantages that the eddy current braking exit loop and the matched electric cutting equipment are added, and compared with the prior art, the power supply circuit of the eddy current braking can be directly cut off through the electric equipment except that the eddy current braking can still be cut off through instructions, so that the safety level of the cutting function is improved by at least one level. The problem of damage to the steel rail and the bogie caused by low-speed application of the vortex brake device can be greatly avoided.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A train brake system based on eddy current braking, comprising: the system comprises an eddy current cutting loop and N sets of eddy current braking systems, wherein N sets of eddy current braking systems corresponding to each other are respectively arranged on N vehicles in a train, 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 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 interrupt wire and a state wire, wherein the interrupt wire is connected with the state wire, N switches which are in one-to-one correspondence with the brake control device are arranged on the interrupt wire, and the state wire 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 wire is in a power-off state; the first circuit breaker is connected with the state wire to supply power to the first circuit breaker through the state wire, and the first circuit breaker is disconnected when the state wire is in a power-off state, so that the connection between the excitation power supply and the eddy current braking device is disconnected;
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 brake system as claimed in claim 1 further comprising: 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 connection between the current transformer and the excitation power supply when the state wire is in a power-off state.
3. The eddy current brake based train brake system as claimed in claim 2 wherein the second circuit breaker is connected to the status line to power the second circuit breaker through the status line, the second circuit breaker being open when the status line is in a de-energized state, thereby effecting disconnection between the current transformer and the excitation power source.
4. The eddy current brake-based train brake system as recited in claim 1 wherein the brake control means is further for controlling 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.
5. The eddy current brake based train brake system as claimed in claim 1 wherein one end of the interrupt wire is connected to a power source and the other end is connected to the status wire.
6. The eddy current brake based train brake system as claimed in claim 1 further comprising: and the eddy current brake control device is respectively connected with the brake control device and the excitation power supply.
7. The eddy current brake-based train brake system as recited in claim 6 wherein the brake control device, the eddy current brake control device and the excitation power source are each configured to collect a speed of a corresponding vehicle.
8. The eddy current brake based train brake system as set forth in claim 7 wherein the brake control means no longer applies eddy current braking force to the eddy current brake control means when the speed of the corresponding vehicle is below the preset value, the eddy current brake control means no longer sends eddy current availability status information to the brake control means, and the excitation power source no longer outputs excitation current.
9. theeddycurrentbrakebasedtrainbrakesystemasrecitedinclaim1whereinNisequaltoM-a,whereineachrespectivesetofeddycurrentbrakesystemsisprovidedonavehicleotherthanthepoweredvehicleinthetrain,abeingthenumberofpoweredvehiclesinthetrain.
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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| Publication Number | Publication Date |
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| CN114043876A CN114043876A (en) | 2022-02-15 |
| CN114043876B true CN114043876B (en) | 2024-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111319257.XA Active CN114043876B (en) | 2021-11-09 | 2021-11-09 | Train braking system based on eddy current braking |
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| CN114043876A (en) | 2022-02-15 |
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