All-electric-drive friction braking system of motor train unit

Abstract

The invention discloses a motor train unit full-electric-drive friction braking system which comprises an electric-drive friction device and a braking control device, the electric-drive friction device is provided with a driving unit, a braking motor, a transmission mechanism, a braking force executing mechanism, an energy storage spring and a locking unit, the energy storage spring has the trend of pushing the transmission mechanism to the braking direction so as to implement emergency braking and can be reversely pushed back to the energy storage position by the transmission mechanism, and the locking unit is connected with a vehicle emergency braking hard wire, receives a control signal of the driving unit and is used for locking or releasing the energy storage spring. When the vehicle emergency braking hard wire loses power and the braking control device breaks down, the locking unit releases the energy storage spring, and the electric drive friction device conducts emergency braking. When the vehicle emergency braking hard wire is electrified, the braking control device has no fault, and the energy storage spring is located at the energy storage position, the locking unit locks the energy storage spring, so that no acting force is generated between the energy storage spring and the transmission mechanism.

Description

Technical Field

[0001] The present invention belongs to the technical field of rail transit EMU braking, and in particular relates to a full-electric drive friction braking system that can meet the needs of high-speed EMUs. Background Art

[0002] With the development of electrification and electronicization of rail vehicles, the braking system needs to deepen the degree of electrification, accelerate the process of system intelligence, and achieve a breakthrough from satisfying functions and improving performance to the final full electrification and intelligence. Compared with the traditional air brake system, the full electric friction brake has the advantages of relying on the controller to drive the brake unit, eliminating the complex air circuit and valves; more accurate control accuracy; faster response time, etc., which can better adapt to the full electrification and intelligence requirements of rail vehicles.

[0003] Research on all-electric drive brake systems has been carried out in both the automotive and aviation fields. In the automotive field, attempts have been made to mix all-electric drive friction brake systems with hydraulic brakes to improve system safety. In the aviation field, a disc-to-disc all-electric drive brake system has been developed based on a multi-plate structure and applied to drones. Research on all-electric drive friction brake systems has been carried out both at home and abroad in the field of rail transit, but it is currently limited to urban rail vehicles operating at low speeds. There is little research in the field of high-speed EMUs. High-speed EMUs have high operating speeds and high safety risks after the brake system fails, so they have high requirements for the safety design and redundant backup design of the brake system. Summary of the invention

[0004] In view of the problems in the related technology, the present invention proposes a fully electric drive friction brake system for EMUs to overcome the above technical problems existing in the existing related technology.

[0005] To this end, the specific technical solution adopted by the present invention is as follows: a fully electric-driven friction brake system for a multiple unit includes an electric-driven friction device for outputting braking force and a brake control device for controlling the electric-driven friction device, wherein the brake control device is connected to a train network and a vehicle hard line throughout the entire vehicle, and the electric-driven friction device has:

[0006] - a drive unit, communicating with the brake control device, for receiving instructions from the brake control device, outputting a drive signal to the brake motor, and outputting a control signal to the locking unit, wherein the drive unit is disposed inside the brake control device or inside the electric drive friction device;

[0007] - Braking motor, receiving the driving signal from the driving unit and outputting the required torque according to the driving signal;

[0008] - a transmission mechanism, connected to the output end of the brake motor, for transmitting the output force of the brake motor to the brake force actuator;

[0009] - Braking force actuator, driven by the transmission mechanism, used to output braking force or implement brake relief;

[0010] - Energy storage spring, which has the tendency to push the transmission mechanism in the braking direction to implement emergency braking, and can be pushed back to the energy storage position by the transmission mechanism;

[0011] - A locking unit, connected to the vehicle emergency brake hard line and receiving the control signal of the drive unit, is used to lock or release the energy storage spring;

[0012] When the vehicle's emergency brake hard line loses power and the brake control device fails, the locking unit releases the energy storage spring and the electric drive friction device implements emergency braking; when the vehicle's emergency brake hard line has power, the brake control device has no faults and the energy storage spring is in the energy storage position, the locking unit locks the energy storage spring so that no force is generated between the energy storage spring and the transmission mechanism.

[0013] Furthermore, when the vehicle emergency brake hard line loses power and the brake control device is normal, the brake control device drives the brake motor to operate through the drive unit to output the braking force required for emergency braking.

[0014] Furthermore, the braking control device has an electronic braking control unit and a backup power supply device that communicate with each other. The electronic braking control unit and the backup power supply device are connected to the train power supply line, and the backup power supply device is used to provide backup power to the electronic braking control unit; when the vehicle power supply is normal, the vehicle low-voltage power supply system supplies power to the electronic braking control unit, and at the same time, the vehicle low-voltage power supply system supplies power to the backup power supply device. When the vehicle low-voltage power supply is abnormal, the backup power supply device supplies power to the braking system.

[0015] In addition, the present invention also claims protection for a train braking control method, characterized in that: based on the above-mentioned EMU all-electric drive friction braking system, the braking control device calculates the braking force demand according to the control signals of the vehicle hard line and the train network, and distributes the braking force throughout the train, giving priority to the use of regenerative braking force, and using friction braking force when the regenerative braking force is insufficient, and transmitting the braking command corresponding to the braking force demand to the drive unit, the drive unit drives the brake motor to operate, the transmission mechanism transmits the output force of the brake motor to the brake force actuator, and the brake action is performed by the brake force actuator; when the braking force relief is required, the brake control device sends instructions related to brake relief to the drive unit, and the drive motor reverses to reset the brake force actuator or reduce the braking force through the transmission mechanism.

[0016] Furthermore, when a single electric-drive friction brake device fails or the electric-drive friction brake device of a vehicle fails, the brake control device redistributes the braking force requirements of each electric-drive friction device within the entire train to ensure the braking force required by the vehicle.

[0017] Furthermore, when the vehicle emergency brake hard line loses power and the brake control device is normal, the brake control device sends emergency brake-related control instructions to the drive unit, and the drive unit itself calculates the control requirements according to the emergency brake hard line redundancy, and takes the larger output after voting with the control instructions input by the brake control device, and the drive unit drives the brake motor to operate, and performs emergency braking through the transmission mechanism and the brake force actuator in sequence;

[0018] When the vehicle emergency brake hard line loses power and the brake control device fails, the drive unit sends a control command to the locking unit to release the spring or the lock spring control command sent by the drive unit to the locking unit loses power, the locking unit releases the energy storage spring, and the spring force of the energy storage spring acts on the transmission mechanism to drive the brake force actuator to generate friction emergency brake parking;

[0019] When the vehicle's emergency brake hard line is energized and the brake control device is normal, the brake control device sends reset-related instructions to the drive unit, and the drive unit drives the brake motor to reverse and perform emergency brake relief. At the same time, the transmission mechanism pushes the energy storage spring back to the energy storage position. When the drive unit detects that the motor has completed resetting, it outputs locking-related control instructions to the locking unit, and the locking unit performs a locking operation to lock the energy storage spring and keep it in the energy storage position.

[0020] The electronic brake control unit in the brake control device of the present invention receives the vehicle hard line and network signal to control the drive unit to generate a drive signal to drive the brake motor to rotate, and convert the motor rotational motion into linear motion through the transmission mechanism to drive the clamp rod to move the brake pads close to the wheel brake disc to generate friction braking to stop the car. When the vehicle emergency brake hard line loses power and the electronic brake control unit is abnormal, the locking unit releases the energy storage spring to act on the transmission mechanism to generate backup friction braking, which greatly improves the braking safety of the system. When the vehicle power supply is abnormal, the backup power supply supplies power to the vehicle, and when the power supply of the brake system of other vehicles is completely abnormal, it supplies power to other vehicles, which greatly improves the safety of braking energy supply when the vehicle power supply is abnormal. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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 will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 4 is a diagram of the braking system architecture of a single vehicle according to an embodiment of the present invention.

[0023] Figure 2It is a gas circuit principle diagram of a full electric drive friction brake system for a motor vehicle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in the field should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0025] like Figure 1 The figure shows the architecture diagram of the full electric drive friction brake system of the EMU according to the embodiment of the present invention. Figure 2 This is a schematic diagram of the air circuit of the full-electric drive friction brake system of the EMU according to an embodiment of the present invention.

[0026] The fully electric-driven friction brake system of the EMU of the embodiment of the present invention comprises an electric-driven friction device for outputting braking force and a brake control device for controlling the electric-driven friction device, and the brake control device is hard-wired to the train network and the vehicle throughout the vehicle. The fully electric-driven friction brake system adopts a drive-integrated electric-driven friction brake device, and the electric-driven friction brake device can be flexibly configured according to the number of brake discs required by the vehicle, and a single brake control device can drive 8 to 12 electric-driven friction brake devices.

[0027] Among them, the brake control device includes an electronic brake control unit and a backup power supply device that communicate with each other, and the electric drive friction device is controlled by the brake control device. The electronic brake control unit and the backup power supply device are connected to the train power supply line, and the backup power supply device is used to provide backup power to the electronic brake control unit. The backup power supply device has a power management system. The backup power supply devices of each vehicle are connected through the backup power train line that runs through the vehicle. The power consumption of the brake system is managed by the power management system. When the vehicle power supply is normal, the vehicle low-voltage power supply system supplies power to the electronic brake control unit, and at the same time, the vehicle low-voltage power supply system supplies power to the backup power supply device. When the vehicle low-voltage power supply is abnormal, the backup power supply device supplies power to the brake system. Since the backup power supply devices of all brake control devices are connected through the backup power parallel circuit that runs through the train, when the backup power supply devices of a single or multiple brake control devices are abnormal, other normal backup power supply devices can supply power to the brake control device with backup power failure through the backup power parallel circuit. In order to ensure the safety of the power consumption of the brake system, in this design, the backup power supply device has the power demand required to meet the vehicle's three emergency braking.

[0028] The electronic brake control device has an interface with the vehicle electrical control and network control, and an interface with the regenerative braking system. The electronic brake control device calculates the braking force requirements of the entire train according to the vehicle electrical, pneumatic and network control instructions, and performs regenerative-friction braking distribution control within the entire train, giving priority to regenerative braking, and using friction braking when regenerative braking is insufficient. When a friction brake device of a certain vehicle or a certain vehicle fails, the electronic brake control unit redistributes the friction braking force according to the available friction brake devices within the entire train.

[0029] The electric drive friction device has: a drive unit, a brake motor, a transmission mechanism, a clamp rod (brake force actuator), an energy storage spring and a locking unit. The drive units of multiple electric drive friction devices located in the same train communicate through an intranet and hard wires. When a drive unit fails, other drive units can drive the motor.

[0030] The drive unit communicates with the brake control device, receives instructions from the brake control device, outputs a drive signal to the brake motor, and outputs a control signal to the locking unit. The drive unit is arranged inside the brake control device or inside the electric drive friction device. The brake motor receives the drive signal from the drive unit and outputs the required torque according to the drive signal. The transmission mechanism is connected to the output end of the brake motor, converts the rotational motion of the brake motor into linear motion, and pushes the clamp rod to move so that the brake pad on the clamp rod is close to the wheel brake disc to produce friction braking and stop. The clamp rod is driven by the transmission mechanism to output braking force or implement brake relief. The energy storage spring has a tendency to push the transmission mechanism in the braking direction to implement emergency braking, and can be pushed back to the energy storage position by the transmission mechanism. The locking unit is connected to the vehicle emergency brake hard line and receives the control signal of the drive unit, which is used to lock or release the energy storage spring.

[0031] The drive unit in the friction brake control device outputs PWM three-term drive signals to the brake motor according to the friction braking force allocated by the electronic brake control unit, driving the brake motor to rotate. The transmission mechanism converts the rotational motion of the brake motor into linear motion, pushing the clamp rod to make the brake pad and the brake disc close to produce friction braking to stop the car.

[0032] When the vehicle's emergency brake loop loses power, the electronic brake control unit outputs the three PWM drive signals required for emergency braking to the brake motor, generating the emergency brake friction braking force under normal conditions. That is, when the vehicle's emergency brake hard line loses power and the brake control device is normal, the brake control device drives the brake motor through the drive unit to output the braking force required for emergency braking.

[0033] When the vehicle emergency brake control loop is powered and the electronic brake control unit is normal, the energy storage spring is locked in the energy storage position by the locking unit. At this time, the energy storage spring does not act on the transmission mechanism and does not produce braking effect. When the vehicle emergency brake control loop loses power and the electronic brake control unit is abnormal, the locking unit acts, releasing the energy storage spring to act on the transmission mechanism, pushing the clamp rod to make the brake pads close to each other, generating redundant backup emergency braking force.

[0034] When the vehicle's emergency brake loop is energized and the electronic brake control unit is normal, the electronic brake control unit outputs a PWM control signal to the brake motor, controls the brake motor to reverse, and pushes the energy storage spring back to the energy storage position. The electronic brake control unit controls the locking unit to lock the energy storage spring, which does not affect the application and release of normal friction braking.

[0035] The all-electric friction brake system of the present invention unifies and coordinates the power supply system and motion system of the vehicle. The basic motion control of the brake system can be achieved by a complete all-electric friction brake system. The system is equipped with necessary redundant emergency brake control mechanisms and logic, necessary redundant power supply protection measures, and provides multiple braking safety protection measures in emergency situations or power system failures. Through the architecture design of the present invention, the full electrification of the high-speed EMU brake system can be achieved, the system structure and the interface between the vehicles are simplified, and the whole vehicle system structure is greatly simplified.

[0036] Based on the train braking control method of the full electric drive friction brake system of the EMU of this embodiment, the braking control device calculates the braking force demand according to the control signals of the vehicle hard line and the train network, and distributes the braking force in the whole train, giving priority to the use of regenerative braking force, using friction braking force when the regenerative braking force is insufficient, and transmitting the braking command corresponding to the braking force demand to the drive unit, the drive unit drives the brake motor to operate, the transmission mechanism transmits the output force of the brake motor to the brake force actuator, and the brake force actuator performs the braking action; when the braking force needs to be relieved, the braking control device sends instructions related to brake relief to the drive unit, and the drive motor reverses so as to reset or reduce the braking force through the transmission mechanism. When a single electric drive friction brake device fails or the electric drive friction brake device of a certain vehicle fails, the braking control device redistributes the braking force demand of each electric drive friction device in the whole train to ensure the required braking force of the vehicle.

[0037] When the vehicle emergency brake hard line loses power and the brake control device is normal, the brake control device sends emergency brake-related control instructions to the drive unit. The drive unit itself calculates the control requirements based on the emergency brake hard line redundancy, and takes the larger output after voting with the control instructions input by the brake control device. The drive unit drives the brake motor to operate, and performs emergency braking through the transmission mechanism and the brake force actuator in turn.

[0038] When the vehicle emergency brake hard line loses power and the brake control device fails, the lock spring control command sent by the drive unit to the lock unit loses power (or the drive unit sends a spring release control command to the lock unit), the lock unit releases the energy storage spring, and the spring force of the energy storage spring acts on the transmission mechanism, driving the brake force actuator to operate, resulting in friction emergency brake parking;

[0039] When the vehicle's emergency brake hard line is energized and the brake control device is normal, the brake control device sends reset-related instructions to the drive unit, and the drive unit drives the brake motor to reverse and perform emergency brake relief. At the same time, the transmission mechanism pushes the energy storage spring back to the energy storage position. When the drive unit detects that the motor has completed resetting, it outputs locking-related control instructions to the locking unit, and the locking unit performs a locking operation to lock the energy storage spring and keep it in the energy storage position.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A fully electric-driven friction brake system for a multiple unit, comprising an electric-driven friction device for outputting braking force and a brake control device for controlling the electric-driven friction device, wherein the brake control device is connected to a train network and a vehicle hard line throughout the entire vehicle, and the electric-driven friction device has: - a drive unit, communicating with the brake control device, for receiving instructions from the brake control device, outputting a drive signal to the brake motor, and outputting a control signal to the locking unit, wherein the drive unit is disposed inside the brake control device or inside the electric drive friction device; - Braking motor, receiving the driving signal from the driving unit and outputting the required torque according to the driving signal; - a transmission mechanism, connected to the output end of the brake motor, for transmitting the output force of the brake motor to the brake force actuator; - Braking force actuator, driven by the transmission mechanism, used to output braking force or implement brake relief; - Energy storage spring, which has the tendency to push the transmission mechanism in the braking direction to implement emergency braking, and can be pushed back to the energy storage position by the transmission mechanism; - A locking unit, connected to the vehicle emergency brake hard line and receiving the control signal of the drive unit, is used to lock or release the energy storage spring; When the vehicle's emergency brake hard line loses power and the brake control device fails, the locking unit releases the energy storage spring and the electric drive friction device implements emergency braking; when the vehicle's emergency brake hard line has power, the brake control device has no faults and the energy storage spring is in the energy storage position, the locking unit locks the energy storage spring so that no force is generated between the energy storage spring and the transmission mechanism.

2. The all-electric drive friction brake system for EMU according to claim 1 is characterized in that: The braking force actuator is a clamp rod or a brake tread.

3. The fully electric drive friction brake system for EMU according to claim 1 is characterized in that: The drive units of multiple electric drive friction devices located in the same train communicate with each other through an intranet and hard lines.

4. The fully electric drive friction brake system for EMU according to claim 1, characterized in that: When the vehicle's emergency brake hard line loses power and the brake control device is normal, the brake control device drives the brake motor through the drive unit to output the braking force required for emergency braking.

5. The fully electric drive friction brake system for EMU according to claim 1, characterized in that: The braking control device has an electronic braking control unit and a backup power supply device that communicate with each other. The electronic braking control unit and the backup power supply device are connected to the train power supply line, and the backup power supply device is used to provide backup power to the electronic braking control unit. When the vehicle power supply is normal, the vehicle low-voltage power supply system supplies power to the electronic braking control unit, and at the same time, the vehicle low-voltage power supply system supplies power to the backup power supply device. When the vehicle low-voltage power supply is abnormal, the backup power supply device supplies power to the braking system.

6. The all-electric drive friction brake system for EMU according to claim 5 is characterized in that: The backup power supply device is capable of meeting the power requirements for three emergency braking of the vehicle to ensure the power safety of the braking system.

7. The all-electric drive friction brake system for EMU according to claim 5, characterized in that: The backup power supply devices of all brake control devices are connected through a backup power supply parallel circuit that runs through the train. When the backup power supply device of a single or multiple brake control devices is abnormal, other normal backup power supply devices will supply power to the brake control device with backup power failure through the backup power supply parallel circuit.

8. A train braking control method, characterized in that: The full-electric drive friction braking system of the EMU is implemented based on any one of claims 1 to 7, wherein the braking control device calculates the braking force demand according to the control signals of the vehicle hard line and the train network, and distributes the braking force throughout the train, giving priority to the use of regenerative braking force, using friction braking force when the regenerative braking force is insufficient, and transmitting the braking command corresponding to the braking force demand to the drive unit, the drive unit drives the brake motor to operate, the transmission mechanism transmits the output force of the brake motor to the brake force actuator, and the brake action is performed by the brake force actuator; when the braking force relief is required, the braking control device sends instructions related to brake relief to the drive unit, and the drive motor reverses to reset the brake force actuator or reduce the braking force through the transmission mechanism.

9. The train braking control method according to claim 8, characterized in that: When a single electric drive friction brake device fails or the electric drive friction brake device of a vehicle fails, the brake control device redistributes the braking force requirements of each electric drive friction device within the entire train to ensure the braking force required by the vehicle.

10. The train braking control method according to claim 9, characterized in that: When the vehicle emergency brake hard line loses power and the brake control device is normal, the brake control device sends emergency brake-related control instructions to the drive unit. The drive unit itself calculates the control requirements based on the emergency brake hard line redundancy, and takes the larger output after voting with the control instructions input by the brake control device. The drive unit drives the brake motor to operate, and performs emergency braking through the transmission mechanism and the brake force actuator in turn. When the vehicle emergency brake hard line loses power and the brake control device fails, the drive unit sends a control command to the locking unit to release the spring or the lock spring control command sent by the drive unit to the locking unit loses power, the locking unit releases the energy storage spring, and the spring force of the energy storage spring acts on the transmission mechanism to drive the brake force actuator to generate friction emergency brake parking; When the vehicle's emergency brake hard line is energized and the brake control device is normal, the brake control device sends reset-related instructions to the drive unit, and the drive unit drives the brake motor to reverse and perform emergency brake relief. At the same time, the transmission mechanism pushes the energy storage spring back to the energy storage position. When the drive unit detects that the motor has completed resetting, it outputs locking-related control instructions to the locking unit, and the locking unit performs a locking operation to lock the energy storage spring and keep it in the energy storage position.

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