Safety monitoring system for running gear of motor train unit

Abstract

The invention discloses a safety monitoring system for a running gear of a motor train unit. The safety monitoring system comprises a safety monitoring device, a detection unit and a power supply unit, the power supply unit is respectively connected with the safety monitoring device and the detection unit and is used for supplying power to the safety monitoring device and the detection unit; each safety monitoring device comprises a plurality of diagnosis modules and preprocessors, and the diagnosis modules are in one-to-one correspondence with the preprocessors; each preprocessor comprises a plurality of acquisition units which are mutually communicated and isolated; the detection unit comprises a plurality of detection modules, and the detection modules are in one-to-one correspondence with the corresponding preprocessors; output signals of the detection modules are divided into a plurality of groups and are respectively transmitted to the acquisition units of the corresponding preprocessors; each diagnosis module and each acquisition unit are combined to form a plurality of independent acquisition diagnosis units. According to the method, the reliability and the redundancy of products are improved by utilizing a component-level backup redundancy method, and the risks of degradation and failure of safety monitoring of the running gear when the system / component fails are reduced.

Description

Technical Field

[0001] The present invention mainly relates to the field of rail transportation technology, and in particular to a safety monitoring system for the running gear of an EMU. Background Art

[0002] The running gear, a key component of rail transit vehicles, primarily consists of the traction motor, wheelset, axlebox, frame, and related damping and connection mechanisms. It plays a crucial role in supporting the vehicle body, transmitting power (for guidance), and ensuring reliable running. It directly impacts the safety, comfort, and punctuality of train operations, and is also one of the components most prone to failure. A failure in the running gear can lead to delays, suspension, or evacuation of rail transit vehicles, at best, or serious accidents involving personal injury, equipment, or road safety.

[0003] Therefore, a running gear safety monitoring system came into being. The system is mainly composed of a safety monitoring device (host) and sensors. The sensors detect the temperature and vibration of the bearings of rotating parts (including axle box bearings, gear box bearings, motor drive end and non-drive end bearings), the lateral acceleration of the bogie frame, and the lateral, vertical and longitudinal acceleration of the car body. The safety monitoring device (host) collects and converts the analog signals output by the sensors, extracts the characteristic states / indicators through software algorithms, and diagnoses the operating status of the components according to the set conditions (including bearing warning / alarm faults, bogie frame instability alarms, car body stability and shaking / rocking warning / alarm faults, as well as wheel polygons, rail corrugation and other faults), and outputs alarm results to guide train operation.

[0004] like Figure 1 As shown in the figure, with the increase in train operating speed levels and the requirements for product miniaturization and strong anti-interference performance, the running gear safety monitoring system has developed from the early single-function monitoring system to the current multi-function integrated monitoring system, and the multi-function integrated monitoring system has been standardly configured and applied in batches on high-speed EMUs.

[0005] Among them, the multifunctional integrated monitoring system and the multifunctional distributed monitoring system are collectively referred to as the multifunctional running gear safety monitoring system. According to the functional composition, component integration and installation distribution, the running gear safety monitoring system is classified as follows:

[0006] (1) Single-function monitoring systems, such as shaft temperature monitoring systems, stability monitoring systems, instability monitoring systems, and vibration monitoring systems. Each system consists of a single-function monitoring device (host) and a single sensor. The sensor is electrically connected to the single-function monitoring device (host) through a cable. The monitoring device (host) collects and converts the sensor analog signal, diagnoses the component operating status, and outputs the alarm results through network communication.

[0007] (2) Multifunctional integrated monitoring systems, such as a 4-in-1 (axle temperature, instability, stability, and vibration) monitoring system. Each system consists of an integrated monitoring device (host) and multiple sensors. The acquisition and conversion of sensor analog signals and the diagnosis of component status are all completed by the integrated monitoring device (host). The sensors are electrically connected to the multifunctional integrated monitoring device (host) through cables. The integrated monitoring device (host) acquires and converts the analog signals of each sensor, diagnoses the operating status of each component, and outputs alarm results through network communication.

[0008] (3) Multifunctional distributed monitoring system, such as 4-in-1 (axle temperature, instability, stability, vibration) monitoring system, etc. Each system consists of a monitoring device (host), a pre-processor and a variety of sensors. Among them, the acquisition of some or all sensor signals is completed by the pre-processor, and according to the location of the sensor, multiple pre-processors can be placed nearby to reduce the wiring length and improve the signal anti-interference ability. The status diagnosis of each component is completed uniformly by the integrated monitoring device (host); the sensor is electrically connected to the pre-processor through a cable, and the pre-processor converts the sensor analog signal into a digital signal, and then sends it to the monitoring device (host) through network communication. The monitoring device (host) diagnoses the operating status of each component and outputs the alarm result through network communication.

[0009] With the continuous improvement of train speed levels, the running gear safety monitoring system has become an important part of the train control system. Its alarm output results are as important as the reliability of the system itself, and both will affect the safety and normal operation order of the train. At present, the failure of the multi-functional integrated running gear safety monitoring system has become the main uncontrollable factor restricting the punctual operation of trains.

[0010] To enhance the reliability of running gear safety monitoring systems and ensure safe and punctual train operation, current mainstream multifunctional integrated or distributed monitoring systems employ partial redundancy within the device (mainframe) for components / critical functions such as power supply, control, and network communications, as well as for bearing temperature sensor detection, achieving a certain degree of reliability improvement. However, the deep integration and continuous miniaturization of multifunctional running gear safety monitoring systems have further magnified and highlighted weaknesses such as low system reliability and the lack of safety monitoring in the event of failures, seriously impacting the operational quality, safety, and normal operation of high-speed trains.

[0011] For example, except for the bearing temperature signals of some systems which are dual-path platinum resistance redundant detection outputs, the instability and stability sensor detection outputs are not designed with redundancy. The failure of the corresponding detection modules and acquisition units will lead to the failure of the real-time safety monitoring functions of vehicle instability and stability, and the train will have a greater risk of safe operation.

[0012] If the integrated monitoring device (host) has a simple redundant design of parts level / key functions in power supply, control and communication functions, the overall reliability of the running gear safety monitoring system will be limited. Failure of the integrated monitoring device (host) will cause the real-time monitoring functions of bearing temperature, instability and stability to fail completely, and the train will have a greater risk in safe operation.

[0013] For example, the monitoring device (host) adopts a plug-in box design, which contains multiple functional boards such as power supply, acquisition conversion, diagnostic control, and communication. The architecture is large and bloated, with high cost and failure rate, occupies a large installation space, and needs to be installed in a cabinet. Summary of the Invention

[0014] In view of the technical problems existing in the prior art, the present invention provides a safety monitoring system for the running gear of an EMU with improved product reliability and redundancy.

[0015] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0016] A safety monitoring system for a running gear of an electric train unit comprises a safety monitoring device, a detection unit and a power supply unit; the power supply unit is connected to the safety monitoring device and the detection unit respectively, and is used to provide power to the safety monitoring device and the detection unit;

[0017] Each of the safety monitoring devices includes a plurality of diagnostic modules and a pre-processor, and each of the diagnostic modules corresponds to the pre-processor one by one; each of the pre-processors includes a plurality of acquisition units that communicate and are isolated from each other;

[0018] The detection unit includes a plurality of detection modules, each detection module corresponds to a corresponding preprocessor one by one; the output signal of each detection module is divided into multiple groups and respectively transmitted to the acquisition unit of the corresponding preprocessor;

[0019] Each of the diagnosis modules is combined with each of the acquisition units to form a plurality of independent acquisition and diagnosis units.

[0020] Preferably, the number of the diagnostic modules is two and they are redundant with each other; the number of the pre-processors is two and they are installed nearby on the corresponding bogies; the number of the acquisition units of each pre-processor is two and the internal temperature and instability acquisition functions are redundant; the number of the detection modules is multiple and the temperature and instability detection functions are redundant.

[0021] Preferably, the diagnostic module and the acquisition unit both include a switching network port and a single network port; the switching network port of one of the diagnostic modules is respectively connected to the switching network port of one of the acquisition units in each preprocessor, and the switching network port of this acquisition unit is further connected to the single network port of another acquisition unit in the same preprocessor, forming an independent acquisition and diagnostic unit;

[0022] The switching network port of another diagnostic module is respectively connected to the switching network port of another acquisition unit in each preprocessor, and the switching network port of this acquisition unit is further connected to the single network port of another acquisition unit in the same preprocessor to form another independent acquisition and diagnosis unit.

[0023] Preferably, the detection unit includes one or more of an unstable acceleration sensor, a smooth acceleration sensor and a temperature-vibration composite sensor; the unstable acceleration sensor is used to detect the lateral vibration form of the bogie frame; the smooth acceleration sensor is used to detect the lateral, vertical and longitudinal vibration forms of the carriage body; the temperature-vibration composite sensor is used to detect the temperature state and vibration state of the bearing.

[0024] Preferably, the number of the unstable acceleration sensors, stable acceleration sensors and temperature vibration composite sensors is multiple, the two unstable acceleration sensors on the same pre-processing are redundant, and the temperature detection parts of the temperature vibration composite sensors at the same position are redundant.

[0025] Preferably, the temperature-vibration composite sensor includes a temperature probe and a vibration probe; each measured position uses two independent temperature probes to detect the bearing temperature; each measured position uses a single vibration probe to detect the bearing vibration signal.

[0026] Preferably, the power supply unit includes two power supply modules, corresponding to each diagnostic module; each power supply module is divided into two power supply branches, one power supply branch serves as the power supply for the corresponding diagnostic module; the other power supply branch serves as the power supply for the acquisition unit in each pre-processor; each acquisition unit inside the pre-processor receives two power supplies supplied by the power supply branches corresponding to each diagnostic module, and is connected to a DC / DC converter after being connected in parallel through diodes to achieve internal and external power supply isolation, voltage conversion and power supply.

[0027] Preferably, the power input end of each acquisition unit in each of the diagnostic modules and each pre-processor is provided with an overcurrent protection circuit.

[0028] The present invention also discloses an EMU running gear, comprising a traction motor, a wheelset, an axle box and the EMU running gear safety monitoring system as described above.

[0029] The present invention further discloses an EMU, comprising a power unit, a brake unit and the EMU running gear as described above.

[0030] Compared with the prior art, the advantages of the present invention are:

[0031] The EMU running gear safety monitoring system of the present invention is based on system-level and hierarchical reliability design. On the basis of ensuring high integration and miniaturization of the product, it uses component-level backup redundancy methods to improve product reliability and redundancy, and reduce the risk of running gear safety monitoring degradation and failure when the system / component fails.

[0032] The present invention is based on a reliable design method for signal detection and transmission based on group redundancy, and sends two-way platinum thermal resistor temperature detection outputs of the bearing, two-way instability detection outputs of the bogie frame, and two-way stability detection outputs of the car body to two independent acquisition units in the pre-processor respectively.

[0033] This invention leverages a reliable design approach for distributed architecture, efficient and redundant signal acquisition, and status diagnosis. It distributes the functions of the preprocessor (including internal acquisition units) and diagnostic modules, and implements a fully redundant design. This system achieves full redundancy for running gear bearing, bogie frame, and vehicle body operating status signal detection, acquisition conversion, status diagnosis, and output. Even if a single acquisition and diagnostic system fails, the running gear's real-time safety monitoring functions for axle temperature, instability, and stability remain intact, doubling system reliability.

[0034] The present invention is based on a design method of analog-to-digital separation, functional integration, and module simplification. The acquisition unit and diagnostic module in the pre-processor are designed as a small, efficient acquisition / processing system, which is independently formed into a board or module. The types of parts and the number of components are reduced, the cost and failure rate are lower, and combined with a distributed architecture, the occupied volume is smaller, the wiring is more economical, the installation is more flexible (it can be flexibly connected to other general-purpose chassis or placed in a cabinet), and the anti-interference performance is stronger. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural diagram of the running gear safety monitoring system in the prior art.

[0036] Figure 2 This is a communication topology diagram of the EMU running gear safety monitoring system in an embodiment of the present invention.

[0037] Figure 3 This is a power supply topology diagram of the EMU running gear safety monitoring system in an embodiment of the present invention. DETAILED DESCRIPTION

[0038] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0039] like Figure 2-3 As shown, the EMU running gear safety monitoring system according to the embodiment of the present invention includes a safety monitoring device and a detection unit;

[0040] Each safety monitoring device includes multiple diagnostic modules and pre-processors, each diagnostic module corresponds to a pre-processor one-to-one; each pre-processor includes multiple acquisition units that communicate and are isolated from each other;

[0041] The detection unit includes multiple detection modules, each of which corresponds to a corresponding preprocessor one by one; the output signal of each detection module is divided into multiple groups and respectively transmitted to the acquisition unit of the corresponding preprocessor;

[0042] Each diagnosis module is combined with each acquisition unit to form a plurality of independent acquisition diagnosis units.

[0043] In one specific embodiment, there are two diagnostic modules and two preprocessors; each preprocessor has two acquisition units; and there are two detection modules. Both the diagnostic modules and acquisition units include a switching network port and a single network port. The switching network port of one diagnostic module is connected to the switching network port of one acquisition unit in each preprocessor; the switching network port of another diagnostic module is connected to the switching network port of another acquisition unit in each preprocessor, and the switching network port of one acquisition unit in the preprocessor is connected to the single network port of the other acquisition unit.

[0044] In a specific embodiment, the detection unit includes multiple types of sensors (such as unstable acceleration sensors, stable acceleration sensors, and temperature vibration composite sensors, etc.), and the detection signals of multiple sensors are grouped redundantly to improve the reliability and redundancy of the state detection of the object being measured. Specifically, the detection signals of the running gear sensor include bearing temperature and vibration signals, bogie frame lateral vibration signals, and car body lateral / vertical / longitudinal vibration signals. Among them, the bearing vibration signal is mainly used to detect and track the early deterioration and mechanical failure of the bearing, and there is no real-time monitoring and diagnosis requirement. Other detection signals, as important factors in determining the safe operation of the train, all need real-time monitoring and diagnosis. According to the signal correlation, the grouping redundancy scheme of each sensor detection and output is as follows:

[0045] The bearing temperature status is detected redundantly using two independent platinum resistance elements built into the temperature probe of the temperature-vibration composite sensor. The two redundant temperature sensor signals of each bearing are in a backup relationship.

[0046] The lateral vibration of the bogie frame is redundantly detected using two symmetrically placed instability acceleration sensors. The acceleration signals of the two instability sensors on each bogie are in a backup relationship.

[0047] The transverse, vertical and longitudinal vibration modes of the carriage body are redundantly detected by two steady acceleration sensors, which are placed symmetrically. The acceleration signals of the two steady sensors on the body are in a backup relationship.

[0048] The backup sensor detection output signal is divided into two groups and sent to two independent acquisition units of the pre-processor for acquisition and conversion, ensuring that each object under test has two independent and redundant detection elements or circuits for real-time status detection and acquisition conversion;

[0049] Since there is no requirement for real-time detection and diagnosis of bearing vibration signals, the vibration probe in the temperature vibration composite sensor is used for non-redundant detection. The sensor detection output signal is sent to each acquisition unit of the pre-processor respectively to ensure that the input signal of each acquisition unit is as balanced as possible.

[0050] Specifically, for EMU trains, each carriage has a car body and two bogies. The corresponding arrangement of sensors and the detection principle of the running gear safety monitoring system are briefly described in the following table:

[0051]

[0052]

[0053] In one specific embodiment, a single safety monitoring device consists of two preprocessors and two diagnostic modules. Each preprocessor contains two independent acquisition units, which utilize Ethernet isolated communication and networking technology to form two independent "acquisition and diagnosis" units, achieving full redundancy for sensor signal acquisition and conversion and alarm diagnosis for real-time safety needs. The specific implementation is as follows:

[0054] The diagnostic module is externally configured with a switching network port, transformer isolation, and a speed of 100Mbps for communicating with two pre-processors; it is externally configured with a single network port, transformer isolation, and a speed of 100Mbps for communicating with other standard chassis or train network systems.

[0055] Each acquisition unit in the pre-processor is equipped with one switching network port and one single network port, with transformer isolation and a rate of 100Mbps. In summary, the communication isolation between the diagnosis module and the acquisition units of the pre-processor is achieved. Figure 2 As shown;

[0056] The 1 / 2 input power of the diagnostic module is divided into two. One power branch is used as the power supply for the diagnostic module, and the power module is used to realize internal and external power isolation, voltage conversion and internal power supply. The other power branch is used as the power supply for the preprocessor, and the power module is used to realize internal and external power isolation, voltage conversion and internal power supply. Each acquisition unit in the preprocessor receives two power supplies supplied by the diagnostic module, and after being connected in parallel through diodes, the power module is used to realize internal and external power isolation, voltage conversion and internal power supply. The front end of the isolated power module input of each acquisition unit of the diagnostic module and the preprocessor is equipped with an overcurrent protection circuit to avoid affecting the power supply of other boards / units when a power failure of a certain board / unit occurs. In summary, the power supply isolation between each acquisition unit in the diagnostic module and the preprocessor is realized, such as Figure 3 As shown;

[0057] like Figure 2 As shown, the above-mentioned communication and power isolation diagnostic modules and pre-processors are combined to form two independent acquisition and diagnostic units:

[0058] like Figure 2 As shown, the first acquisition and diagnosis unit consists of: a single network port of acquisition unit B in one preprocessor + a switching network port of acquisition unit A in one preprocessor + a switching network port of diagnostic module 1 + switching network ports of acquisition unit A in two preprocessors + single network ports of acquisition unit B in two preprocessors;

[0059] The second acquisition and diagnosis unit consists of: a single network port of acquisition unit A in one preprocessor + a switching network port of acquisition unit B in one preprocessor + a switching network port of diagnostic module 2 + two switching network ports of acquisition unit B in two preprocessors + a single network port of acquisition unit A in two preprocessors.

[0060] Utilize the Ethernet communication isolation and data sharing features to build a distributed architecture, efficient and redundant collection and diagnosis system to improve the reliability and redundancy of safety monitoring devices.

[0061] In a specific embodiment, a design method of analog-digital separation + functional integration and module simplification is used to design the preprocessor (acquisition unit) and the diagnostic module into an analog signal acquisition system and a digital signal processing system, respectively, to achieve component miniaturization, modularization, functional integration, and flexible installation. Specifically:

[0062] Diagnostic module: It is a high-performance digital signal processing system. It contains functional circuits such as a high-speed and high-performance processor, 100Mbps Ethernet communication, power isolation conversion, and large-capacity data storage. It is integrated into a single board to realize functions such as bearing temperature and vibration, bogie frame instability, and centralized diagnosis of vehicle body stability, network communication, and data recording. It adopts standard specification boards and can be flexibly inserted into standard chassis to realize miniaturization, integration, lightweight and easy installation of diagnostic function boards. It adopts a redundant architecture with dual diagnostic module backup to realize highly reliable diagnosis and communication of the running gear.

[0063] Preprocessor: It has two independent acquisition units built in. Each acquisition unit is a real-time multi-sensor signal acquisition system. It contains a processor, 16-bit precision parallel analog-to-digital acquisition, 100Mbps Ethernet communication, power isolation conversion and other functional circuits, integrated into one acquisition unit to realize sensor interface, temperature / instability / stability / vibration state signal acquisition and conversion, network communication and other functions; it adopts a closed box-type module structure and can be flexibly installed in the cabinet or car body to achieve miniaturization, integration and easy installation; by installing it close to the object to be measured (such as the bogie), shorter wiring and lower signal interference can be achieved.

[0064] The above-mentioned diagnostic modules are preferably designed as standard specification boards and inserted into other standard chassis for rapid deployment and use; they can also be designed as independent diagnostic modules, directly connected to the train network system and power supply system for independent deployment and use.

[0065] The above-mentioned pre-processor is preferably designed to have two sets of independent acquisition units built in, and the sensor detection output signals with redundant backup interfaces respectively form a fully redundant detection and diagnosis system; it can also be designed as 4 independent acquisition modules with a closed box-type module structure, which can be flexibly installed near the object to be measured.

[0066] Compared with the existing multifunctional running gear safety monitoring system, the present invention has more reliable and higher redundancy real-time diagnostic performance, effectively ensuring the quality and safety of train operation and reducing the impact of product failures.

[0067] When the running gear safety monitoring system is working normally, each diagnostic module relies on its own independent Ethernet communication network to obtain all sensor data collected by the four acquisition units of the pre-processor (including shaft temperature, instability, stable redundant backup data and bearing vibration data), and perform status monitoring, characteristic indicator extraction, alarm diagnosis and network output; at this time, the upper chassis or train network system gives priority to the output result of diagnostic module 1# for train control.

[0068] When a diagnostic module fails or has a communication fault, the other diagnostic module can still rely on its own independent Ethernet communication network to obtain all sensor data collected by the four acquisition units of the pre-processor (including shaft temperature, instability, stable redundant backup data and bearing vibration data), and perform status monitoring, characteristic index extraction, alarm diagnosis and network output; at this time, the upper chassis or train network system determines that the diagnostic module 1# has a communication fault or fails, and adopts and selects the output result of the diagnostic module 2# for train control.

[0069] When a sensor (including transmission lines) for detecting bearing temperature / structure instability / car body stability, or a collection unit (including communication and power lines) fails, each diagnostic module can still obtain the other half of the backup collection data (single-channel collection data for bearing temperature, instability, and stability, and partial bearing vibration collection data) to perform status monitoring, feature index extraction, alarm diagnosis, and network output; at this time, the upper chassis or train network system determines that a sensor backup channel or a collection unit of the pre-processor has failed, and adopts and selects the output results of the normal backup sensor collection diagnosis to perform train control.

[0070] Compared with the existing multifunctional running gear safety monitoring system, the present invention has only two components, the pre-processor and the diagnostic module, or three components, the acquisition unit A, the acquisition unit B and the diagnostic module. Each component is a small acquisition or processing system that integrates power supply, communication and processing on a single board. The specific advantages are:

[0071] 1. Fewer parts and lower maintenance costs;

[0072] 2. The board has high integration, fewer types and quantities of materials, and lower overall failure rate;

[0073] 3. Modular components, smaller size and more flexible installation;

[0074] 4. The diagnostic module can be inserted into other chassis or become an independent module. The acquisition unit A and acquisition unit B can be integrated into a pre-processor or become an independent module, which makes the application scenario more flexible.

[0075] The EMU running gear safety monitoring system of the present invention is based on system-level and hierarchical reliability design. On the basis of ensuring high integration and miniaturization of the product, it uses component-level backup redundancy methods to improve product reliability and redundancy, and reduce the risk of running gear safety monitoring degradation and failure when the system / component fails.

[0076] The present invention is based on a reliable design method for signal detection and transmission based on group redundancy, and sends two-way platinum thermal resistor temperature detection outputs of the bearing, two-way instability detection outputs of the bogie frame, and two-way stability detection outputs of the car body to two independent acquisition units in the pre-processor respectively.

[0077] The present invention is based on a reliable design method of architecture distribution, efficient redundant signal acquisition, and status diagnosis, distributes the functions of the pre-processor (including the internal acquisition unit) and the diagnostic module, and performs a full backup redundant design.

[0078] The present invention realizes a fully redundant design of running gear bearings, bogie frame, and vehicle body operating status signal detection, acquisition conversion, status diagnosis, and output. When a single set of acquisition and diagnosis systems fails, the running gear axle temperature, instability, and stability real-time safety monitoring functions will not fail, and the system reliability is doubled.

[0079] The present invention is based on a design method of analog-to-digital separation, functional integration, and module simplification. The acquisition unit and diagnostic module in the pre-processor are designed as a small, efficient acquisition / processing system, which is independently formed into a board or module. The types of parts and the number of components are reduced, the cost and failure rate are lower, and combined with a distributed architecture, the occupied volume is smaller, the wiring is more economical, the installation is more flexible (it can be flexibly connected to other general-purpose chassis or placed in a cabinet), and the anti-interference performance is stronger.

[0080] The present invention also discloses a running gear of an EMU, comprising a traction motor, a wheelset, an axlebox, and the above-described EMU running gear safety monitoring system. In addition to the aforementioned components, the running gear may also include a car body, a suspension system, an electrical system, a braking system, a traction system, a guide system, and the like.

[0081] The present invention further discloses an EMU, comprising a power unit, a control unit and the EMU running gear as described above. Of course, in addition to the above components, the EMU may also include a door system, a power supply system, etc.

[0082] The EMU running gear and the EMU of the present invention both include the running gear safety monitoring system as described above, and also have the advantages described for the running gear safety monitoring system.

[0083] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions based on the principles of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A safety monitoring system for the running gear of an EMU, characterized in that: It includes a safety monitoring device, a detection unit and a power supply unit; the power supply unit is connected to the safety monitoring device and the detection unit respectively, and is used to provide power to the safety monitoring device and the detection unit; Each of the safety monitoring devices includes a plurality of diagnostic modules and a pre-processor, and each of the diagnostic modules corresponds to the pre-processor one by one; Each of the pre-processors includes a plurality of acquisition units that communicate and are isolated from each other; The detection unit includes a plurality of detection modules, each detection module corresponds to a corresponding preprocessor one by one; the output signal of each detection module is divided into multiple groups and respectively transmitted to the acquisition unit of the corresponding preprocessor; Each of the diagnosis modules is combined with each of the acquisition units to form a plurality of independent acquisition and diagnosis units.

2. The EMU running gear safety monitoring system according to claim 1, characterized in that: The number of the diagnostic modules is two and they are redundant with each other; the number of the pre-processors is two and they are installed nearby on the corresponding bogies; the number of the acquisition units of each pre-processor is two and the internal temperature and instability acquisition functions are redundant; the number of the detection modules is multiple and the temperature and instability detection functions are redundant.

3. The EMU running gear safety monitoring system according to claim 2, characterized in that: The diagnostic module and the acquisition unit both include a switching network port and a single network port; the switching network port of one of the diagnostic modules is connected to the switching network port of one of the acquisition units in each preprocessor, and the switching network port of this acquisition unit is further connected to the single network port of another acquisition unit in the same preprocessor, forming an independent acquisition and diagnostic unit; The switching network port of another diagnostic module is respectively connected to the switching network port of another acquisition unit in each preprocessor, and the switching network port of this acquisition unit is further connected to the single network port of another acquisition unit in the same preprocessor to form another independent acquisition and diagnosis unit.

4. The EMU running gear safety monitoring system according to claim 1, 2 or 3, characterized in that: The detection unit includes one or more of an unstable acceleration sensor, a stable acceleration sensor and a temperature-vibration composite sensor; the unstable acceleration sensor is used to detect the lateral vibration form of the bogie frame; the stable acceleration sensor is used to detect the lateral, vertical and longitudinal vibration forms of the carriage body; the temperature-vibration composite sensor is used to detect the temperature state and vibration state of the bearing.

5. The EMU running gear safety monitoring system according to claim 4, characterized in that: The number of the unstable acceleration sensor, stable acceleration sensor and temperature vibration composite sensor is multiple, the two unstable acceleration sensors on the same pre-processing are redundant, and the temperature detection parts of the temperature vibration composite sensor at the same position are redundant.

6. The EMU running gear safety monitoring system according to claim 5, characterized in that: The temperature-vibration composite sensor includes a temperature probe and a vibration probe; each measured position uses two independent temperature probes to detect the bearing temperature; each measured position uses a single vibration probe to detect the bearing vibration signal.

7. The EMU running gear safety monitoring system according to claim 2 or 3, characterized in that: The power supply unit includes two power modules, corresponding to each diagnostic module; each power module is divided into two power branches, one power branch serves as the power supply for the corresponding diagnostic module; the other power branch serves as the power supply for the acquisition unit in each preprocessor; each acquisition unit inside the preprocessor receives two power supplies supplied by the power branches corresponding to each diagnostic module, and is connected to a DC / DC converter after being connected in parallel through diodes to achieve internal and external power isolation, voltage conversion and power supply.

8. The EMU running gear safety monitoring system according to claim 7, characterized in that: The power input end of each acquisition unit in each of the diagnostic modules and each pre-processor is provided with an overcurrent protection circuit.

9. A running gear of an EMU, comprising a traction motor, a wheelset and an axle box, characterized in that: It also includes the EMU running gear safety monitoring system as described in any one of claims 1-8.

10. An EMU comprising a power unit and a control unit, characterized in that: It also includes the EMU running gear as claimed in claim 9.

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