GJB289A bus network state detection device in external field environment

Abstract

The utility model provides a GJB289A bus network state detection device in an external field environment. The GJB289A bus network state detection device comprises a communication module, a waveform analysis module and an impedance analyzer, the communication module is in communication connection with the waveform analysis module and the to-be-tested bus, performs communication test on the to-be-tested bus, and records the communication state of the to-be-tested bus; the waveform analysis module is in communication connection with the bus to be tested to realize signal waveform test; the impedance analyzer is in communication connection with a to-be-tested cable corresponding to the to-be-tested bus, and carries out an attenuation test on the to-be-tested cable. By integrating the communication module, the waveform analysis module and the impedance analyzer, a GJB289A bus network can be tested to ensure the reliability and stability of communication. And the waveform analysis module and the impedance analyzer can test the signal waveform on the bus to be tested and analyze the impedance, so that the test requirements are met.

Description

Technical Field

[0001] This utility model belongs to the field of aviation technology, specifically relating to a GJB289A bus network status detection device in an outdoor environment. Background Technology

[0002] The GJB289A bus is the "nerve" and "skeleton" of an aircraft's avionics system. It connects various subsystems to share information. The reliability of the GJB289A bus network directly affects the normal operation of the entire system.

[0003] Because the GJB289A bus cable operates in a complex electromagnetic and varying physical environment on aircraft, and is subjected to friction, vibration, high temperature, and high humidity, improper maintenance, or failure to effectively monitor the GJB289A bus network during maintenance, can lead to unstable operation of the aircraft's avionics systems. In practical use and maintenance of the GJB289A bus, several problems exist, including latent faults in single-redundancy operation, malfunctions in the priority control function between the GJB289A bus network controller and backup bus controller, and a lack of dedicated GJB289A bus network status monitoring equipment, resulting in low inspection efficiency.

[0004] How to effectively detect and troubleshoot the GJB289A bus network, and thus ensure its stable operation, is a pressing technical problem that needs to be solved. Utility Model Content

[0005] The GJB289A bus network status detection device provided by this utility model can effectively test the GJB289A bus network in an outdoor environment, ensuring the stable operation of the GJB289A bus network.

[0006] The GJB289A bus network status detection device for outdoor environments includes: a communication module, a waveform analysis module, and an impedance analyzer.

[0007] The communication module is connected to both the waveform analysis module and the bus under test (TBT) to perform communication tests on the TBT and record the communication status of the TBT.

[0008] The waveform analysis module communicates with the bus under test to perform signal waveform testing.

[0009] The impedance analyzer is connected to the cable under test corresponding to the bus under test to perform attenuation tests on the cable under test.

[0010] It should be further noted that the communication module uses the GJB289A communication module;

[0011] The GJB289A communication module can function simultaneously as a bus controller (BC), a remote terminal (RT), and a bus monitor (BM).

[0012] It should be further noted that the impedance analyzer is equipped with a signal generator and an impedance testing module.

[0013] It should be further noted that it also includes: a storage battery, a charging circuit, a charging interface, and a power supply circuit; the storage battery is electrically connected to the charging interface through the charging circuit.

[0014] The battery's power supply terminal is electrically connected to the communication module, waveform analysis module, and impedance analyzer via a power supply circuit.

[0015] It should be further noted that the communication module, waveform analysis module, and impedance analyzer are each equipped with a control switch and a display touch screen.

[0016] As can be seen from the above technical solutions, this utility model has the following advantages:

[0017] This invention provides a GJB289A bus network status detection device for outdoor environments, integrating a communication module, a waveform analysis module, and an impedance analyzer. It can quickly diagnose the operating status of the GJB289A bus network. The device utilizes the waveform analysis module to detect signal waveform characteristics and the impedance analyzer to evaluate the network impedance characteristics, thereby meeting the need for rapid fault location. Attached Figure Description

[0018] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of a GJB289A bus network status detection device in an outdoor environment;

[0020] Figure 2 This is a schematic diagram of an embodiment of the GJB289A bus network status detection device in an outdoor environment.

[0021] Figure 3 A schematic diagram of charging and powering the detection device. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1 The diagram shown is a schematic of a GJB289A bus network status detection device in an outdoor environment according to a specific embodiment. The GJB289A bus network status detection device in this embodiment is mainly for testing the GJB289A bus, which is the bus under test described in this embodiment.

[0024] The GJB289A bus network includes GJB289A bus terminals and bus connection components. Terminals are interface components between the GJB289A bus and various subsystems, responsible for data exchange. On the GJB289A bus, terminals are divided into three types: bus controllers, remote terminals, and bus monitors. These terminals are typically embedded in the subsystems in the form of Bus Interface Boards (MBIs), with one end connected to the subsystem's CPU via a backplane and the other end connected to the network via a bus connector. Bus connection components include bus cables, couplers, terminating resistors, and connectors.

[0025] The device in this embodiment includes a communication module, a waveform analysis module, and an impedance analyzer.

[0026] Optionally, the communication module adopts a full-function GJB289A communication module.

[0027] The communication module is connected to both the waveform analysis module and the bus under test (TB) to perform communication tests on the TB and record its communication status. The waveform analysis module is connected to the TB to perform signal waveform testing. The impedance analyzer is connected to the corresponding cable under test (TB) to perform attenuation tests on the cable.

[0028] According to embodiments of this application, such as Figure 2 As shown, the GJB289A communication module is a multi-functional module that can simultaneously function as a bus controller, remote terminal unit, and bus monitor.

[0029] It should be noted that the bus controller BC is used to control the communication status, and there is only one bus controller BC in the GJB289A bus network.

[0030] The remote terminal unit (RT) is a device that participates in communication, and the bus controller (BC) controls the operation of the remote terminal unit (RT).

[0031] The bus monitor (BM) serves a monitoring function and is used to record data.

[0032] The GJB289A bus network in this embodiment is a bus structure, meaning that all terminals are connected to a single cable, communicate in an orderly manner based on a preset communication method, and are controlled by the bus controller BC.

[0033] The GJB289A bus network is configured with two sets of cables: one for channel A and one for channel B. Channels A and B are in a master-slave relationship.

[0034] Specifically, the GJB289A communication module is used to coordinate and manage the data transmission of the communication module.

[0035] The GJB289A communication module can send commands and data to the bus under test and receive returned status information through the remote terminal unit RT. The bus controller BC can ensure that data transmission on the bus proceeds in an orderly manner according to a predetermined communication protocol and timing.

[0036] The bus monitor (BM) is used to receive information transmitted on the bus and extract communication status information. It can also monitor and record data transmission on the bus. The bus monitor (BM) can capture all communication data on the bus.

[0037] The remote terminal unit (RT) can perform corresponding operations according to the instructions sent by the bus controller (BC), such as sending data, receiving data, or returning status.

[0038] The bus controller BC, bus monitor BM, and remote terminal unit RT enable data transmission and communication functions.

[0039] In this embodiment, the GJB289A communication module simultaneously supports BC / BM / RT functions, can be connected to the GJB289A bus to simulate and test BC / BM / RT functions, and can record communication status during airborne bus testing, simulate communication modules, and perform communication tests and data analysis.

[0040] The waveform analysis module in this embodiment can use the RT validity test function to perform GJB5186 related tests on signal waveforms.

[0041] The impedance analyzer in this embodiment can use a standard signal source to output a signal, and an impedance tester can be used to perform attenuation tests.

[0042] like Figure 2 As shown, this embodiment can perform segmented testing on the trunk or branch lines of the bus under test. The segmentation method can be based on the trunk lines of two adjacent devices and their corresponding branch lines.

[0043] The device has detection channel A and detection channel B. Detection channel A and detection channel B can perform the detection process separately.

[0044] For example, the bus under test can be segmented and tested according to the main lines of two adjacent devices and their corresponding branches. Alternatively, the main cables and branch cables on the bus under test can be digitally marked for testing and analysis.

[0045] Optionally, the bus monitor has a reserved network test interface for routine monitoring of the bus under test or its cables. The bus controller can schedule data transmission and reception.

[0046] In this embodiment, for the A-channel detection process, the main lines of two adjacent devices and their corresponding branches are monitored through the A-channel of the bus monitor.

[0047] For example, the A channel of the bus monitor monitors the remote terminal unit to send and receive messages of the first segment of the bus under test. If the remote terminal unit receives the response normally, it means that the first segment of the bus under test is normal, and the number of transmitted messages is recorded.

[0048] The bus monitor's A channel monitors the remote terminal unit's transmission and reception of messages on the second segment of the bus under test. If the remote terminal unit receives the response normally, it indicates that the first segment of the bus under test is normal, and the number of transmitted messages is recorded.

[0049] The A channel of the bus monitor monitors the remote terminal unit's transmission and reception of messages on the third segment of the bus under test. If the remote terminal unit receives an abnormal response, it indicates that the third segment of the bus under test is abnormal. The number of message errors is recorded and the abnormality is displayed.

[0050] Using the above analysis method, it is possible to analyze whether the trunk lines of two adjacent devices and their corresponding branches can transmit data normally, as well as the number of message errors that occur during data transmission. Furthermore, by using cable anomaly indicators, the location of the faulty cable in channel A can be identified.

[0051] This embodiment also involves switching all messages to B for transmission, which can test for cable faults in the B channel.

[0052] The test utilizes the GJB289A bus command response feature, based on the actual installation location of the device on the bus under test, to perform cable testing and data storage without disassembling the device. The analysis data from the bus monitor can be used to calculate the location of the anomaly. Once the anomaly node is identified, the analyzer is switched to the bus controller using the messages monitored by the bus monitor, the original bus controller on the network is turned off, the analyzer's bus controller is configured according to the monitored anomaly node, and it communicates with the anomaly node as the bus controller, monitoring the communication results to analyze whether the node is abnormal and perform precise location.

[0053] Once the abnormal node in the bus under test is located, the cause of the abnormality can be further analyzed. A waveform analysis module can be used to pinpoint the problem. Furthermore, an impedance analyzer can be used to test the cable impedance attenuation and analyze whether the cable is functioning correctly.

[0054] In some embodiments, for the process of using a GJB289A bus network status detection device in an outdoor environment, a reserved detection terminal can be connected to the bus under test, i.e., the GJB289A bus network. The bus monitor (BM) monitors and records the transmitted and received information from the remote terminal unit, including online / offline queries, vector word queries, messages, clock synchronization, etc. By monitoring the bus under test through the bus monitor (BM), recording the number of transmitted messages and the time, the communication status of the bus under test and the terminal can be determined.

[0055] The GJB289A bus network status detection device in this embodiment can also perform a preemptive switching function test on the GJB289A bus network in an outdoor environment. During the test, the master bus controller and backup bus controller of the GJB289A bus network are powered on. By monitoring changes in the network status, it is confirmed whether the backup bus controller can successfully switch and control the network within a specified time, and it is verified whether the network management messages issued by the backup bus controller are consistent with those of the master bus controller.

[0056] In some embodiments, for ease of use, such as Figure 3 As shown, the device also includes: a storage battery, a charging circuit, a charging interface, and a power supply circuit; the storage battery is electrically connected to the charging interface through the charging circuit; the power supply terminal of the storage battery is electrically connected to the communication module, the waveform analysis module, and the impedance analyzer through the power supply circuit, respectively, to meet the usage requirements of the device.

[0057] The communication module, waveform analysis module, and impedance analyzer are each equipped with control switches and touchscreen displays. This facilitates user operation.

[0058] It should be noted that the GJB289A bus network status detection device in the above-mentioned field environment can realize network transmission content detection, priority preemption function check, and rapid network status survey.

[0059] The network transmission content detection is based on the GJB289A bus module in the detection device operating in BM mode, acting as a bus monitor. The BC (Block Controller) in the onboard GJB289A bus network sends commands to organize communication, sequentially activating each subsystem in the GJB289A bus network. Based on the online status and communication status of each subsystem, the BM monitors and records the communication-organizing commands issued by the onboard BC, the terminal addresses of each subsystem, and the corresponding message content. When the GJB289A bus module operates in BC mode, acting as the network bus controller, it needs to simulate the commands issued by the onboard BC.

[0060] The preemption function check is based on manually turning the embedded bus controller and backup controller subsystems on the aircraft on and off. The GJB289A bus module in the detection device operates in BM mode, monitoring whether the backup controller successfully preempts control within a specified time. If the bus controller is restarted, the main control system can preempt control within the specified time.

[0061] A rapid network status check is based on the premise that, prior to testing, the testing personnel already know the terminal addresses of each subsystem on the aircraft, as well as the commands sent by the bus controller, and that the embedded bus controller and backup controller subsystems on the aircraft are shut down. The GJB289A bus module in the testing device operates in BC mode. The bus controller on the simulator sends commands to each subsystem alternately on channels A and B to determine the operational status of the remote terminals within the subsystem. Simultaneously, an impedance analyzer and waveform analyzer are used to determine the status of the current path; a characteristic impedance of less than 5Ω measured at the short-circuit end is considered normal.

[0062] The following is a specific implementation of the GJB289A bus network status detection device in an outdoor environment, as provided in this embodiment. In the detection preparation stage, the operator first needs to accurately and securely connect the testing device to the GJB289A bus network through a pre-set dedicated detection port. Then, the GJB289A bus interface module of the testing device is configured to operate in BM mode.

[0063] Initiating the monitoring phase: Activate the subsystem with the built-in bus controller on the aircraft. At this time, the detection device in BM mode begins to play a crucial role, monitoring and accurately recording various network management messages from the BC end, such as online / offline queries, clock synchronization, and other information.

[0064] The remaining subsystems are started in sequence according to the established order. During this process, the BM terminal continuously monitors the actions of each subsystem when it comes online, outlining the architecture of the entire airborne bus network and clarifying the location and identification of each node.

[0065] Based on the massive amount of information previously collected by the BM end, including various message attributes such as message type, period, and specific content, and combined with the recorded terminal addresses of each subsystem, the GJB289A bus interface module inside the detector is used in BC mode.

[0066] This application enables comprehensive and multi-layered detection of network transmission content, allowing for the timely identification of potential transmission errors, data loss, and node failures in the bus network. For example, if a subsystem experiences abnormal delays or unresponsiveness upon going online, the source of the fault can be quickly located by referring to the detailed information recorded on the BM terminal and the message scheduling table. Whether it is a hardware interface problem or a software configuration error, it can be accurately pinpointed, significantly shortening troubleshooting time and improving the efficiency of aircraft field maintenance.

[0067] This application also checks the power-switching function. Before checking, initial settings are performed to ensure that the main control system with the embedded bus controller, the backup control system with the embedded backup bus controller, and all subsystems are powered on.

[0068] Main control system shutdown: Manually shut down the main control system, monitor network status changes through the BM terminal, confirm whether the backup control system can successfully take over the network within the specified time, and verify the consistency of the network management messages it sends with the original main control system.

[0069] Recovery Test: Restart the main control system and continue to monitor the network status through the BM terminal to assess whether the main control system can successfully seize control within the specified time.

[0070] This application also provides a rapid network status survey. The rapid survey is performed by having the GJB289A bus interface board within the detection device operate simultaneously in BC and BM modes. With the circuit breakers of the main control system and the backup control system disconnected, the detector sequentially sends online / offline query messages via the main cable and backup cable according to a previously created message scheduling table. The online status of the subsystem is then determined based on the status word responses returned by the subsystem.

[0071] This device uses modules in combination according to requirements. The GJB289A module is a communication module supporting the GJB289A protocol. It supports BC / BM / RT functions, connects to the GJB289A bus to simulate BC / BM / RT functions, and is used to record communication status, simulate communication modules, and perform communication tests and data analysis during airborne bus testing. The waveform analysis module uses the RT validity test function to perform GJB5186-related tests on signal waveforms. The impedance analyzer uses a standard signal source for signal output and uses an impedance tester for attenuation testing. The GJB289A bus trunk and branch lines A and B are segmented and marked according to the relative positions of adjacent device trunks and their corresponding branches. All main and branch cables on the bus are digitally marked for data analysis. The bus analyzer, as BM's bus monitoring device, connects to the reserved network test interface. When the airborne bus malfunctions or routine monitoring of the airborne bus cables is required, the bus controller begins bus scheduling for data transmission and reception. Taking channel A as an example, assuming the order of the nodes on the bus is BC-BM-RT1-RT2-RT3, the specific analysis method is as follows:

[0072] If the bus monitoring device detects the first message from BC to RT1 through the bus monitor A channel and RT1 responds normally, it indicates that the common segment cables are all normal. This part of the cable is then marked as normal, and the number of transmitted messages can be recorded.

[0073] If the bus monitoring device detects the second message from BC to RT2 through the bus monitor A channel, and RT2 responds normally, it indicates that the common cable of the BC-RT2 segment is normal. The cable with this number is then marked as normal, and the number of transmitted messages can be recorded.

[0074] If the bus monitoring device detects the third message from BC to RT3 through the bus monitor A channel, but RT3 responds with an error (assuming RT3 is working properly), then based on the above two messages, it is inferred that the sub-cable corresponding to RT3 and the main cable from RT2 to RT3 may be abnormal, and the test results indicate that the corresponding cable serial number is incorrect.

[0075] Using the above analysis method, it is possible to analyze whether each cable segment can transmit data normally, as well as the number of message errors that occur during data transmission. Furthermore, by using the cable anomaly marker, the location of the faulty cable in channel A can be easily located.

[0076] By switching all messages to channel B for transmission, the fault condition of the channel B cable can be tested.

[0077] Based on the actual installation location of the device on the bus branch, the test utilizes the command response characteristics of the GJB289A bus to perform cable testing and data storage without disassembling the device. Using the analysis data from BM, the location of the anomaly can be roughly calculated. Once the anomaly node is identified, the analyzer is switched to a BC device using the messages monitored by BM, the original BC on the network is shut down, the analyzer's BC is configured according to the anomaly node monitored by BM, and it communicates with the anomaly node as a BC, monitoring the communication results, analyzing whether the node is abnormal, and performing precise location.

[0078] Once the abnormal node in the bus is located, further analysis of the cause of the abnormality is needed. It is necessary to determine whether the abnormal node RT is normal. The waveform analysis device GJB5186 is used to locate the device problem. For the corresponding cable impedance attenuation, an impedance analyzer can be used to test the cable attenuation and analyze whether the cable is normal.

[0079] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A GJB289A bus network status detection device for outdoor environments, characterized in that, include: Communication module, waveform analysis module, and impedance analyzer; The communication module is connected to both the waveform analysis module and the bus under test (TBT) to perform communication tests on the TBT and record the communication status of the TBT. The waveform analysis module communicates with the bus under test to perform signal waveform testing. The impedance analyzer is connected to the cable under test corresponding to the bus under test to perform attenuation tests on the cable under test.

2. The GJB289A bus network status detection device in an outdoor environment according to claim 1, characterized in that, The communication module adopts the GJB289A communication module; The GJB289A communication module includes a bus controller, a bus monitor, and a remote terminal unit.

3. The GJB289A bus network status detection device in an outdoor environment according to claim 1, characterized in that, The impedance analyzer is equipped with a signal generator and an impedance testing module.

4. The GJB289A bus network status detection device in an outdoor environment according to claim 1, characterized in that, The communication module supports the GJB289A protocol.

5. The GJB289A bus network status detection device in an outdoor environment according to claim 1, characterized in that, Also includes: Battery, charging circuit, charging interface, and power supply circuit; The battery is electrically connected to the charging interface via a charging circuit; The battery's power supply terminal is electrically connected to the communication module, waveform analysis module, and impedance analyzer via a power supply circuit.

6. The GJB289A bus network status detection device in an outdoor environment according to claim 1, characterized in that, The communication module, waveform analysis module, and impedance analyzer are each equipped with a control switch and a display touch screen.

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