Rail transit disc-shaped eddy current braking device and control method thereof

Abstract

The invention discloses a rail transit disc-shaped eddy current braking device and a control method thereof.The rail transit disc-shaped eddy current braking device comprises a vehicle bogie and a disc-shaped eddy current brake, the disc-shaped eddy current brake is arranged on the vehicle bogie, a brake disc is arranged in the middle of the disc-shaped eddy current brake, and the brake disc is connected to an axle; the disc-shaped eddy current brake is connected with a brake control unit; the device is simple in structure and reasonable in design, electric energy is converted into magnetomotive force for braking through the disc-shaped eddy current braking technology, constant braking force can be provided within the large speed range of a train, dust pollution generated by friction braking can be avoided, the device has the advantages of being intelligent, environmentally friendly and the like, and the new requirement of the rail train for a braking system is met.

Description

Technical Field

[0001] The present invention relates to the technical field of high-speed train braking systems, and in particular to a rail transit disc eddy current braking device and a control method thereof. Background Art

[0002] In recent years, rail transit has paid increasing attention to the intelligence of braking systems and long-term operating costs, and improving the closed-loop control of braking systems through methods such as eddy current braking or electromechanical braking has gradually emerged.

[0003] Deficiencies of existing technology:

[0004] The current braking system is unable to provide a relatively constant braking force over a wide range of train speeds, is prone to dust pollution caused by friction braking, and cannot meet the braking system requirements of rail trains. Summary of the invention

[0005] The object of the present invention is to provide a rail transit disc eddy current brake device and a control method thereof to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a rail transit disc eddy current brake device, comprising a vehicle bogie and a disc eddy current brake, wherein the disc eddy current brake is arranged on the vehicle bogie, a brake disc is arranged in the middle of the disc eddy current brake, the brake disc is connected to the axle, and the disc eddy current brake is connected to a brake control unit.

[0007] Preferably, the disc eddy current brake comprises:

[0008] An electromagnet fixing bracket, wherein the electromagnet fixing bracket is arranged on the vehicle bogie;

[0009] A protective cover, the protective cover is arranged on the electromagnet fixing bracket;

[0010] The electromagnet is arranged on the electromagnet fixing bracket, the electromagnet comprises a plurality of pairs of magnetic poles, and the electromagnet is flush with the disc surface of the brake disc.

[0011] Preferably, the magnetic pole includes a terminal, a flat enameled wire, a glass fiber mesh, a thermal tape and a pole, the flat enameled wire is arranged on the pole, and the glass fiber mesh is covered on the outside of the flat enameled wire through the thermal tape.

[0012] Preferably, a shear pin is provided between the electromagnet fixing bracket and the iron core of the magnetic pole.

[0013] Preferably, the magnetic poles are uniformly arranged along the radial direction of the brake disc and are located on the disc surface of the brake disc close to the outer circle.

[0014] Preferably, the iron core of the electromagnet is made of soft magnet Q235B.

[0015] Preferably, the thickness of the electromagnet fixing bracket is set to 20 mm.

[0016] Preferably, the brake control unit includes a power interface, a signal interface, an input interface and an output interface, and the power interface and the signal interface are spaced apart.

[0017] The present invention also provides the following technical solution: a control method for a rail transit disc eddy current brake device, the method comprising the following steps: S1, a brake control unit receives a command from a driver's cab or a vehicle brake control unit (BCU), controls the on and off of the excitation current of the electromagnet magnetic pole pair according to the command, and determines the working state of the magnetic pole pair by collecting the magnetic pole pair current analysis, and transmits the working state of the disc eddy current brake to the driver's cab or BC through a command signal;

[0018] S2. When the electromagnet is energized, an eddy current magnetic field is formed on the outer surface of the brake disc. The eddy current magnetic field hinders the rotation of the brake disc, thereby applying brakes to the vehicle.

[0019] Preferably, the brake control unit in S1 is powered by the vehicle battery (DC110V), which is filtered and converted to 3.3V to power the main control board in the brake control unit. The 110V power supply is divided according to the electromagnet configuration, and each path is driven by a MOS half-bridge to achieve high-side control / low-side control. The high-side control means that one end of the magnetic pole is connected to the power supply to control the other end to be turned on and off with a low level; the low-side control means that one end of the magnetic pole is connected to a low level to control the other end to be turned on and off with the power supply. The maximum drain-source voltage of the MOS tube reaches 1200V, and the continuous current is 100A. The heat sink is attached to the back of the MOS tube for heat dissipation;

[0020] Each power branch collects current signals through an AD chip. The ADC acquisition circuit uses a front-stage integrated Hall current acquisition sensor plus ADC sampling. Dual Hall acquisition performs differential sensing on the current to suppress the common mode field and improve the accuracy in a magnetic noise environment. The Hall sensor fits closely with the magnetic field in space.

[0021] The MCU processor of the brake control unit has two CAN bus controllers, and uses an isolation chip to achieve CAN isolation, with a transmission rate of 1Mbps.

[0022] The brake control unit uses UART to USB to achieve online diagnosis and online download of operating data; UART uses digital integrated isolation design to achieve isolation between the main controller and external communication;

[0023] The brake control unit displays the current operating status of the brake control unit and disc eddy current brake through LED lights.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The invention discloses a rail transit disc eddy current brake device and a control method thereof. The brake disc and a brake control unit are provided. The brake control unit receives instructions from a driver's cab or a vehicle brake control device, controls the on and off of the electromagnet excitation current according to the instructions, and judges the working state of the magnetic pole pair by collecting the magnetic pole pair current analysis. The working state of the disc eddy current brake is transmitted to the driver's cab or the BCU through the instruction signal. The disc eddy current brake technology converts electrical energy into magnetic motive force for braking, can provide a relatively constant braking force within a wide speed range of the train, and can avoid dust pollution caused by friction braking. The invention has the characteristics of intelligence and greenness, and meets the new requirements of rail trains for the braking system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the brake assembly of the present invention;

[0027] Figure 2 It is a schematic diagram of a disc eddy current brake of the present invention;

[0028] Figure 3 It is a partial structural schematic diagram of the present invention;

[0029] Figure 4 It is a control schematic diagram of the disc eddy current brake device of the present invention;

[0030] Figure 5 It is a schematic diagram of the structure of the brake control unit of the present invention;

[0031] Figure 6 It is a schematic diagram of the electromagnet control circuit of the present invention;

[0032] In the figure: 110, vehicle bogie; 120, disc eddy current brake; 130, brake disc; 140, axle; 121, protective cover; 122, electromagnet fixing bracket; 123, electromagnet; 150, terminal; 160, shear pin. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "setting" should be understood in a broad sense, for example, it can be fixed connection, setting, or detachable connection, setting, or integrated connection, setting. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0037] Example 1

[0038] See also Figure 1-6 As shown, the present invention provides a technical solution for a rail transit disc eddy current brake device: comprising a vehicle bogie 110 and a disc eddy current brake 120, the disc eddy current brake 120 is installed on the vehicle bogie 110, the disc eddy current brake 120 is connected to a brake control unit, a brake disc 130 is arranged in the middle of the disc eddy current brake 120, the brake disc 130 is connected to the axle 140, the brake control unit is also connected to the vehicle connector through a cable, powered by the vehicle battery, and connected to the vehicle by hard wire or communication, the disc eddy current brake 120 sits on both sides of the brake disc 130 The disc eddy current brake 120 includes a protective cover 121, an electromagnet fixing bracket 122 and an electromagnet 123. The protective cover 121 is connected to the vehicle bogie 110, the electromagnet fixing bracket 122 is installed on the protective cover 121, the electromagnet 123 is installed on the electromagnet fixing bracket 122, and the electromagnet 123 is composed of a pair of magnetic poles or a plurality of pairs of magnetic poles; the electromagnet 123 is flush with the disc surface of the brake disc 130, and the brake disc 130 is fixedly connected to the axle 140. When the axle 140 rotates or stops synchronously, the eddy current braking force acts on the axle 140 through the brake disc 130 during braking.

[0039] Furthermore, the magnetic pole includes a terminal 150, an insulating tape, a flat enameled wire, a glass fiber mesh, a thermal tape, a pole plate and a pole. The flat enameled wire is wound around the pole and isolated by the insulating tape. The glass fiber mesh is fastened to the outside of the flat enameled wire by the thermal tape. A thermistor is installed inside the flat enameled wire. The internal temperature of the magnetic pole can be obtained by collecting the resistance value of the thermistor.

[0040] Furthermore, the core of the electromagnet 123 is made of soft magnet Q235B, and the magnetic conductivity is improved by heat treatment. In order to improve the connection strength between the electromagnet 123 and the electromagnet fixing bracket 122, a shear pin 160 is provided to connect the pole core and the electromagnet fixing bracket 122.

[0041] Furthermore, different numbers of magnetic poles are set according to the braking force requirements of the disc eddy current brake 120, a pair of magnetic poles are connected in series, and multiple pairs of magnetic poles are connected in parallel. A freewheeling protector is installed between each pair of magnetic pole circuits. When installing a pair of magnetic poles, the pair of magnetic poles are installed at adjacent positions on the same side of the brake disc 130. When installing two pairs of magnetic poles, the two pairs of magnetic poles are installed at adjacent positions on one side of the brake disc 130, and the other pair of magnetic poles are installed on the other side of the brake disc 130 at positions corresponding to the previous pair of magnetic poles.

[0042] Furthermore, the brake control unit includes a power interface, a signal interface, an input interface and an output interface. The power interface and the signal interface are arranged separately in space. The input interface is used to receive external signal instructions, and the output interface transmits signal instructions to the outside. The brake control unit panel is provided with an LED indicator light for displaying the product operation status or fault information; the brake control unit is powered by the vehicle battery, which is filtered and converted to 3.3V to power the main control board in the brake control unit. The 110V power supply is divided according to the configuration of the electromagnet 123, and each path is driven by a MOS half-bridge. High-side control and low-side control are realized; high-side control means that one end of the magnetic pole is connected to the power supply to control the other end of the magnetic pole to be on and off with the low level; low-side control means that one end of the magnetic pole is connected to the low level to control the other end of the magnetic pole to be on and off with the power supply. The maximum drain-source voltage of the MOS tube is 1200V, and the continuous current is 100A. The heat sink is attached to the back of the MOS tube for heat dissipation; each power branch collects current signals through the AD chip, and the ADC acquisition circuit adopts the front-stage integrated Hall current acquisition sensor plus ADC sampling method, and the dual Hall acquisition performs differential sensing on the current to suppress the common mode field and improve the accuracy in the magnetic noise environment.

[0043] Furthermore, the MCU processor of the brake control unit has a 2-way CAN bus controller, and uses an isolation chip to achieve CAN isolation with a transmission rate of 1Mbps; by simplifying the connection method and using UART to USB, online diagnosis and online download of operating data are realized, and UART adopts a digital integrated isolation design to achieve isolation between the main controller and external communications, and the brake control unit displays the current operating status of the brake control unit and the disc eddy current brake 120 through an LED light.

[0044] When in use, a rail transit disc eddy current brake device of the present embodiment is provided with a disc eddy current brake 120, a brake disc 130 and a brake control unit. The brake control unit receives instructions from the driver's cab or the vehicle brake control device, controls the on and off of the excitation current of the electromagnet 123 according to the instructions, and determines the working state of the magnetic pole pair by collecting the magnetic pole pair current analysis, and transmits the working state of the disc eddy current brake 120 to the driver's cab or BCU through the instruction signal. The disc eddy current braking technology converts electrical energy into magnetic motive force for braking, and can provide a relatively constant braking force within a large speed range of the train, and can avoid dust pollution caused by friction braking. It has the characteristics of intelligence and greenness, and meets the new requirements of rail trains for braking systems.

[0045] Example 2

[0046] See also Figure 1-6 As shown, the present invention provides a control method for a rail transit disc eddy current brake device, and the method comprises the following steps:

[0047] S1, the brake control unit receives the command from the driver's cab or the vehicle brake control unit (BCU), controls the on and off of the excitation current of the magnetic pole pair of the electromagnet 123 according to the command, and determines the working state of the magnetic pole pair by collecting the magnetic pole pair current analysis, and transmits the working state of the disc eddy current brake 120 to the driver's cab or BC through the command signal;

[0048] S2. When the electromagnet 123 is energized, an eddy current magnetic field is formed on the outer surface of the brake disc. The eddy current magnetic field hinders the rotation of the brake disc, thereby applying brakes to the vehicle;

[0049] The brake control unit is powered by the vehicle battery DC110V, which is filtered and converted to 3.3V to supply power to the main control board in the brake control unit. The 110V power supply is divided according to the electromagnet configuration, and each path is driven by a MOS half-bridge to achieve high-side control / low-side control. High-side control means that one end of the magnetic pole is connected to the power supply to control the other end to be on and off with a low level; low-side control means that one end of the magnetic pole is connected to a low level to control the other end to be on and off with the power supply. The maximum drain-source voltage of the MOS tube is 1200V, and the continuous current is 100A. The heat sink is attached to the back of the MOS tube for heat dissipation.

[0050] Each power branch collects current signals through an AD chip. The ADC acquisition circuit uses a front-stage integrated Hall current acquisition sensor plus ADC sampling. Dual Hall acquisition performs differential sensing on the current to suppress the common mode field and improve the accuracy in a magnetic noise environment. The Hall sensor fits closely with the magnetic field in space.

[0051] The MCU processor of the brake control unit has two CAN bus controllers, and uses an isolation chip to achieve CAN isolation, with a transmission rate of 1Mbps.

[0052] The brake control unit uses UART to USB to achieve online diagnosis and online download of operating data; UART uses digital integrated isolation design to achieve isolation between the main controller and external communication;

[0053] The brake control unit displays the current operating status of the brake control unit and disc eddy current brake through LED lights.

[0054] The disc-shaped eddy current brake 120 and the brake disc interface match the existing vehicle interface and can be directly replaced. The electromagnets of the eddy current brake device are evenly arranged along the radial direction of the brake disc, and the magnetic poles are located on the brake disc surface relatively close to the outer circle.

[0055] The brake control unit is powered by the vehicle battery (DC110V), which is filtered and converted to supply power to the main control board in the brake control unit. The power supply in the brake control unit is divided into 4 channels, each of which is driven by a MOS half-bridge to achieve high-side control / low-side control of 4 pairs of magnetic poles.

[0056] The maximum drain-source voltage of the MOS tube is 1200V, and the continuous current is 100A. The heat sink is attached to the back of the MOS tube for heat dissipation. Each power branch collects current signals through an AD chip. The front stage of the ADC acquisition circuit integrates a Hall current acquisition sensor plus an ADC sampling method. The dual Hall acquisition performs differential sensing of the current to suppress the common mode field and improve the accuracy in a magnetic noise environment.

[0057] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A rail transit disc eddy current brake device, comprising a vehicle bogie (110) and a disc eddy current brake (120), characterized in that: The disc eddy current brake (120) is arranged on the vehicle bogie (110), a brake disc (130) is arranged in the middle of the disc eddy current brake (120), the brake disc (130) is connected to the axle (140), and the disc eddy current brake (120) is connected to a brake control unit.

2. A rail transit disc eddy current brake device according to claim 1, characterized in that: The disc-shaped eddy current brake (120) comprises: An electromagnet fixing bracket (122), wherein the electromagnet fixing bracket (122) is arranged on the vehicle bogie (110); A protective cover (121), wherein the protective cover (121) is arranged on the electromagnet fixing bracket (122); An electromagnet (123), wherein the electromagnet (123) is arranged on the electromagnet fixing bracket (122), the electromagnet (123) comprises a plurality of pairs of magnetic poles, and the electromagnet (123) is flush with the disc surface of the brake disc (130).

3. A rail transit disc eddy current brake device according to claim 2, characterized in that: The magnetic pole comprises a terminal (150), a flat enameled wire, a glass fiber mesh, a thermal band and a pole, wherein the flat enameled wire is arranged on the pole, and the glass fiber mesh is covered on the outside of the flat enameled wire through the thermal band.

4. A rail transit disc eddy current brake device according to claim 2, characterized in that: An anti-shear pin (160) is provided between the electromagnet fixing bracket (122) and the iron core of the magnetic pole.

5. The rail transit disc eddy current brake device according to claim 2, characterized in that: The magnetic poles are evenly arranged along the radial direction of the brake disc (130) and are located on the disc surface of the brake disc (130) close to the outer circle.

6. A rail transit disc eddy current brake device according to claim 2, characterized in that: The iron core of the electromagnet (123) is made of soft magnet Q235B.

7. The rail transit disc eddy current brake device according to claim 3, characterized in that: The thickness of the electromagnet fixing bracket (122) is set to 20 mm.

8. The rail transit disc eddy current brake device according to claim 1, characterized in that: The brake control unit includes a power interface, a signal interface, an input interface and an output interface, and the power interface is spaced apart from the signal interface.

9. The control method of the rail transit disc eddy current brake device according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: S1, a brake control unit receives a command from a driver's cab or a vehicle brake control unit (BCU), controls the on and off of the excitation current of the magnetic pole pair of the electromagnet (123) according to the command, and determines the working state of the magnetic pole pair by collecting the magnetic pole pair current analysis, and transmits the working state of the disc eddy current brake (120) to the driver's cab or BC through a command signal; S2. When the electromagnet (123) is energized, an eddy current magnetic field is formed on the outer surface of the brake disc. The eddy current magnetic field hinders the rotation of the brake disc, thereby applying brakes to the vehicle.

10. The control method of a rail transit disc eddy current brake device according to claim 9, characterized in that: In S1, the brake control unit is powered by a vehicle battery, and the voltage is reduced through power filtering and conversion to supply power to a main control board in the brake control unit. The vehicle battery power supply is divided according to the configuration of the electromagnet (123), and each path is driven by a MOS half-bridge to achieve high-side control / low-side control. The high-side control means that one end of the magnetic pole is connected to the power supply and the other end is controlled to be on and off with a low level; the low-side control means that one end of the magnetic pole is connected to a low level and the other end is controlled to be on and off with the power supply; Each power branch collects current signals through an AD chip. The ADC acquisition circuit uses a front-stage integrated Hall current acquisition sensor plus ADC sampling. Dual Hall acquisition performs differential sensing on the current to suppress the common mode field and improve the accuracy in a magnetic noise environment. The Hall sensor fits closely with the magnetic field in space. The MCU processor of the brake control unit has two CAN bus controllers and uses an isolation chip to achieve CAN isolation; The brake control unit uses UART to USB to achieve online diagnosis and online download of operating data; UART adopts digital integrated isolation design to achieve isolation between the main controller and external communication; The brake control unit displays the current operating status of the brake control unit and disc eddy current brake through LED lights.

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