A fault injection system for aviation electromechanical integrated test

Abstract

The application provides a fault injection system for aviation electromechanical integrated test, and belongs to the technical field of aviation technology electromechanical system as a whole. In the system, a fault signal of a hard line is generated by a disconnecting and switching device, and the connection of a switching fault injection master computer and an electromechanical integrated system terminal on an electromechanical bus is completed. The fault injection master computer controls the electric control switching of the hard line, the switching of the electromechanical system bus, the cooperation with an exciter, and the behavior simulation of a fault terminal. Through the combination of the disconnecting and switching device and the fault injection master computer, the electric control disconnecting and the programmable fault injection method are adopted, and the test master control network is relied on to solve the problems of low fault injection coverage, low efficiency and difficulty in realizing cross-link test in traditional electromechanical integrated test. The master computer supports an operation interface, and the functions of expandable fault injection operation, export of test results, simulation and analysis of fault injection test data can be expanded. The application can be improved in adaptability according to different test requirements, and has good universality.

Description

Technical Field

[0001] This invention belongs to the field of overall technical technology of aviation electromechanical systems, and in particular relates to a fault injection system for integrated testing of aviation electromechanical systems. Background Technology

[0002] Fault injection primarily generates various required fault states during integrated electromechanical testing of aircraft, including analog signal fault injection, digital signal fault injection, power supply fault injection, and communication fault injection. It supports the simulation of various faults in aircraft electromechanical systems, enabling the simulation of various fault scenarios. In traditional integrated electromechanical testing, power supply and analog signal faults are mainly simulated using disconnect panels to simulate the continuity, disconnection, and short circuits of electrical signals in the electromechanical system; bus and communication faults are mainly simulated through software-integrated simulation functions. For certain hard-wired faults, such as power supply faults and open ground circuits, using disconnect panels for fault injection is an effective method. However, in terms of the types of faults simulated and testing efficiency, the following prominent problems remain: 1) Low test repeatability: Because each test requires manual operation of the disconnect switch, and each test step needs to be reset, test repeatability is low. For situations requiring multiple repeated tests, using disconnect panels is very time-consuming and inefficient; 2) Manual operation: Disconnect panels require manual operation; testers need to manually switch the disconnect switch and monitor the testing process. Manual operation is not only time-consuming but also prone to errors, which may affect the accuracy of test results; 3) It cannot be automated: Because the disconnect panel requires manual operation, it cannot be integrated with an automated testing system. Automated testing systems can greatly improve testing efficiency and accuracy, an advantage that the disconnect panel cannot achieve.

[0003] For bus and software faults, using the built-in testing of communication software has the following drawbacks: 1) Interconnection testing between different devices: Since the built-in functions of the software are implemented by each device according to its preset test requirements, the functions and implementation methods of different devices are different, and the fault modes and manifestations of their built-in software may also be different. Accordingly, this method cannot support the unified and coordinated interconnection testing of multiple devices; 2) Limitations in test scope: The built-in functions of device software can usually only simulate and test the functions that have been defined and implemented in the software. For external or unforeseen fault conditions, comprehensive testing cannot be performed, resulting in low coverage. Therefore, using the built-in functions of software for fault injection testing has limitations in test scope; 3) Inability to simulate hardware faults: The built-in functions of software cannot simulate hardware faults, such as memory corruption and hard disk failure. These faults have a significant impact on the normal operation of the system and software. Therefore, using only the built-in functions of software for fault injection testing is not comprehensive enough; 4) Test cost and time: The linkage between different devices usually requires the involvement of multiple people, which requires objective test costs and time. In addition, to support fault injection testing, additional code and logic need to be added, increasing the difficulty of development and testing.

[0004] In summary, traditional electromechanical integrated testing suffers from low fault injection coverage and low efficiency, and fault injection makes it difficult to achieve cross-link testing. Summary of the Invention

[0005] To address the problems of low fault injection coverage, low efficiency, and difficulty in achieving cross-linked testing in traditional electromechanical integrated testing, this invention provides a fault injection system for aerospace electromechanical integrated testing. By cooperating with an electromechanical test management system, it achieves smooth and timely fault injection. The technical solution is as follows:

[0006] Firstly, a fault injection system for integrated aircraft electromechanical testing is provided, comprising: disconnection and switching equipment, and a fault injection main control computer.

[0007] The disconnection and switching equipment is used to generate hard-wired fault signals and complete the connection of the switching fault injection main control computer and electromechanical integrated system terminal on the electromechanical bus.

[0008] The fault injection main control computer is used to control hard-wired electrical control switching, electromechanical system bus switching, cooperation with the exciter, and simulation of the behavior of fault terminals;

[0009] To simulate the impact of terminal failure on bus devices, a fault injection host computer is used to simulate the data processing and bus transmission and reception behavior of the faulty terminal, and to test whether other bus devices respond as expected.

[0010] The disconnection and switching devices include multiple hard-wired disconnection modules and bus switching modules.

[0011] The hard-wire disconnect module includes a relay sub-module and an internal bus coupler. The hard-wire disconnect module receives control signals from the internal bus of the fault injection system, completes the target electrically controlled disconnect fault injection, and realizes manual on / off and short-circuit actions.

[0012] The bus switching module is used to complete the intervention of the fault injection master computer. Through high-speed digital isolation technology, it switches the electromechanical system related buses between the original terminal and the fault injection machine.

[0013] Specifically, the fault injection master computer is used for:

[0014] It communicates with the exciter in the test system and controls the exciter to send a predetermined fault signal to the electromechanical system terminal (such as RIU). The fault signal is a voltage or current target communication interface. The specified modes of the fault signal include fully defined, superimposed, and gain. The fully defined mode is that the exciter injects a signal with a waveform specified by the fault injection master control computer into the terminal. The superimposed mode is that the original output of the exciter is superimposed with noise or drift defined by the fault injection master control computer. The gain mode is that the original output of the exciter is subjected to a gain defined by the fault injection master control computer.

[0015] Execute the fault injection script and send on / off / short circuit signals through the hard-wire disconnect panel to control the simulation exciter to send fault signals and complete the time synchronization of fault signal injection;

[0016] By using the bus switching panel, faults (such as missing data bits, incorrect data replacement, and verification faults) are injected into the electromechanical system bus, and the time synchronization of the injected signals is completed.

[0017] In coordination with the overall test control network, joint testing was conducted in accordance with the agreed data exchange protocol and time synchronization mechanism;

[0018] Provides hardware adaptation and management for internal bus and target electromechanical system related buses, and reads fault injection interface information of the device under test.

[0019] The hardware of the system consists of a bus module, a signal generator, a power control box, a signal adapter box, a fault injection disconnection simulation interface device, a discrete analog quantity switching matrix, and an interface adapter device.

[0020] The bus module performs bus simulation for the fault injection system.

[0021] The signal generator completes the output and acquisition of discrete and analog quantities in the fault injection system;

[0022] The power control box completes the power supply control of the test piece or the system under test. The input of the power control box is a high-precision 28V DC flow control power supply. The power control box is equipped with a multi-channel power output control module, which can independently realize the control of any one channel power output, and provide power-on and power-off control for the fault injection test piece. The control module communicates with the fault injection master computer via 485 bus, and receives and executes the computer's instructions.

[0023] The signal adapter box adopts a rack-mount chassis design to complete signal conversion and distribution, match the electrical characteristics of the signals, and has an anti-misinsertion design to maintain the signal interface state consistent with the test piece. Its panel is equipped with a disconnection block, through which all signals of the fault injection system are disconnected and controlled, and at the same time, the disconnection block is used to complete the measurement and calibration of various types of signals. The signal adapter box also integrates a relay board that outputs on / off status signals.

[0024] The fault injection disconnection simulation interface device is used for programmable switching of bus signals and non-bus signals, and completes the switching control of the data channel between the fault injection system, the signal excitation system and the test specimen;

[0025] Discrete-to-analog switching matrix is ​​used for channel switching control of discrete and analog quantities;

[0026] The interface adapter adopts a chassis design. The panel connectors are divided into two areas: the test simulation signal input area and the standard connector interface output area. The test simulation signal input area connectors are connected to the electromechanical subsystem exciter connectors. By using the fault injection disconnection simulation interface equipment to switch back to the function on the interface adapter, the subsystem excitation signal is introduced into the test piece. At the same time, the switching matrix card outputs the fault injection system excitation signal to the test piece through the connector interface.

[0027] Among them, the fault injection disconnection simulation interface device uses an FPGA as the main controller, connects to the fault management computer via Ethernet, receives switching instructions from the fault management computer, and completes the injection of fault signals and channel switching.

[0028] The fault injection disconnection simulation interface device consists of a bus switching device and a discrete analog quantity switching device. The switching device has a built-in switching matrix for switching control of test simulation signals, fault injection signals and test piece signals, so as to meet the fault injection requirements of the fault injection system under specific test conditions.

[0029] The signal adapter box is used for signal conversion, matching and connection between the signal generating device and the fault injection disconnection simulation interface device. The signal adapter box panel is equipped with disconnection terminals, and all input and output signals of the fault injection system enter the test system after disconnection.

[0030] The bus module consists of a PCI industrial computer and a bus board.

[0031] The signal generating device consists of a PXI industrial computer and multiple function boards.

[0032] The discrete analog quantity switching matrix includes a relay card.

[0033] The beneficial effects of this invention are at least as follows:

[0034] This invention combines disconnection and switching equipment with a fault injection master computer, employing electrically controlled disconnection and programmable fault injection (fault script editing) methods. Relying on a test master control network, it solves the problems of low fault injection coverage, low efficiency, and difficulty in implementing cross-linking tests in traditional electromechanical integrated testing. Simultaneously, the master computer supports an operating interface and can be expanded to include fault injection operations, exporting test results, simulation, and analysis of fault injection test data. Attached Figure Description

[0035] Figure 1 A schematic diagram of the fault injection system;

[0036] Figure 2 A schematic diagram showing the location of fault injection in the electromechanical integrated testing system;

[0037] Figure 3 A schematic diagram illustrating the structure and principle of fault injection;

[0038] Figure 4 A simplified diagram of the bus switching principle;

[0039] Figure 5 Hardware configuration diagram of the fault injection system. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0042] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0043] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0044] See Figure 1 , Figure 2 and Figure 3 One embodiment of the present invention provides a fault injection system for integrated testing of aerospace electromechanical systems, comprising:

[0045] Disconnection and device switching, fault injection into the main control computer

[0046] The disconnection and switching equipment is used to generate hard-wired fault signals and complete the connection of the switching fault injection main control computer and electromechanical integrated system terminal on the electromechanical bus.

[0047] The fault injection master computer is used to control hard-wired electrical control switching, electromechanical system bus switching, cooperation with the exciter, and behavior simulation of the faulty terminal; the fault injection master computer simulates the data processing and bus transmission and reception behavior of the faulty terminal, and tests whether other bus devices respond as expected.

[0048] The connection and switching equipment includes multiple hard-wire disconnection modules and bus switching modules.

[0049] The hard-wire disconnect module includes a relay sub-module and an internal bus coupler. The hard-wire disconnect module receives control signals from the internal bus of the fault injection system, completes the target electrically controlled disconnect fault injection, and realizes manual on / off and short-circuit actions.

[0050] The bus switching module is used to complete the intervention of the fault injection master computer. Through high-speed digital isolation technology, it switches the electromechanical system-related buses between the original terminal and the fault injection machine. (See [link to relevant documentation]). Figure 4 .

[0051] The fault injection main control computer is specifically used for:

[0052] It communicates with the exciter in the test system and sends a predetermined fault signal to the electromechanical system terminal by controlling the exciter. The fault signal is a voltage or current target communication interface. The specified modes of the fault signal include fully defined, superimposed, and gain. The fully defined mode is that the exciter injects a signal with a waveform specified by the fault injection master control computer into the terminal. The superimposed mode is that the original output of the exciter is superimposed with noise or drift defined by the fault injection master control computer. The gain mode is that the original output of the exciter is subjected to the gain defined by the fault injection master control computer.

[0053] Execute the fault injection script and send on / off / short circuit signals through the hard-wire disconnect panel to control the simulation exciter to send fault signals and complete the time synchronization of fault signal injection;

[0054] The fault is injected into the electromechanical system bus through the bus switching panel, and the time synchronization of the signal injection is completed.

[0055] In coordination with the overall test control network, joint testing was conducted in accordance with the agreed data exchange protocol and time synchronization mechanism;

[0056] Provides hardware adaptation and management for internal bus and target electromechanical system related buses, and reads fault injection interface information of the device under test.

[0057] See Figure 5 The hardware of the system is divided into a bus module, a signal generator, a power control box, a signal adapter box, a fault injection disconnection simulation interface device, a discrete analog quantity switching matrix, and an interface adapter device.

[0058] The PCI industrial computer and bus board form a bus module to realize the bus simulation function of the fault injection system.

[0059] The fault injection management computer is an industrial PC with an ECO-1818 motherboard. All cards use PCI bus interfaces. It includes one 1394B card (3 channels, 3 nodes, model ZK1E043FKP), one AFDX card (2 10 / 100M RJ45 interfaces, model PCI-AFDX), one ARINC429 card (16 input channels, 16 output channels, model KMHT429-PCI-16R16T), and one serial card (each card has 16 channels and can be configured arbitrarily in 422 or 485 mode, model CHRU34307).

[0060] A PXI industrial computer and multiple function boards form a signal generation device to realize the output and acquisition of discrete and analog signals of the fault injection system. The non-bus excitation of the fault injection machine is composed of a PXI system. The chassis is an 18-slot PXI-62719A, the controller is a PXI-63982, and it has two built-in frequency boards, each with 8 channels for a total of 16 channels, model CHR42203S-EX; two resistor cards, each with 6 resistance simulation signals for a total of 12 channels, model CHRU4A206; one RVDT / LVDT simulation card, each with 8 outputs, model CHR47201; and two resolver simulation cards, each with 4 resolver signals for a total of 8 channels, model CPCI-1. 304; 2 discrete output cards, each with 96 outputs for a total of 192 channels, configurable as 28V / on or ground / on output, model CHRU44206; 2 discrete acquisition cards, each with 96 acquisition channels for a total of 192 channels, capable of acquiring 28V / on and ground / on inputs, model CHRU44205; 2 current output cards, each with 8 outputs for a total of 16 channels, model CHR42205; 1 voltage output card, each with 64 outputs, model CHR42201; 1 voltage acquisition card, each with 64 acquisition channels, model CHR41202; 1 current acquisition card, each with 16 acquisition channels, model CHR41205.

[0061] The power control box enables power supply control for the test piece or the system under test. The input of the power control box is a high-precision 28V DC flow control power supply. The power control box is designed with multiple power output control modules, which can independently control any one power output, providing flexible power-on and power-off control for the fault injection test piece. The control module communicates with the fault injection management computer via a 485 bus, receiving and executing the instructions of the management computer.

[0062] The signal adapter box adopts a dual 4U rack-mount design, featuring signal conversion and distribution functions to match signal electrical characteristics. It incorporates an anti-misinsertion design, ensuring consistent signal interface states with the test specimen. A disconnection block is integrated on the panel; all signals from the fault injection system are controlled via this block, which also enables calibration of various signal types. The signal adapter box integrates a relay board that outputs on / off status signals. While the signal adapter box needs to acquire on / off signals, the acquisition board cannot directly acquire them; they must be converted to grounding signals before being acquired using a discrete quantity distribution board. The signal adapter box integrates an on / off state conversion module to achieve on / off to grounding conversion.

[0063] The fault injection disconnection simulation interface device is a key component of the fault injection system, primarily responsible for switching between discrete, analog, and bus signals. The analog interface device consists of a 4U bus switching unit and a 4U discrete-to-analog switching unit, housed in a rack-mount chassis design. Bus switching is implemented using an opto-relay matrix, with channel control handled by an embedded FPGA main control circuit. Communication with the fault injection management computer is achieved via a switch. The various bus switching matrix cards employ a modular design, allowing for rapid replacement with identical cards in case of failure, thus improving system maintainability.

[0064] The discrete-to-analog switching matrix primarily controls the switching between discrete and analog signals. This function is implemented using relay cards. These relay switching cards employ a universal and modular design, making them suitable for switching all analog signals. During system construction, multiple relay cards can be inserted into the control baseboard to achieve multi-channel signal switching control. The baseboard uses an embedded FPGA as the main controller, and the switching card adopts a 3U PXI structure, offering strong versatility and easy maintenance.

[0065] The interface adapter adopts a 6U rack-mount chassis design. The panel connectors are divided into two areas: the test simulation signal input area and the standard connector interface output area. The test simulation signal input area connectors are connected to the electromechanical subsystem exciter connectors. By using the function of switching back to the interface adapter on the fault injection disconnection simulation interface device, the subsystem excitation signal is introduced into the test piece. At the same time, the switching matrix card can also output the fault injection system excitation signal to the test piece through the standard connector interface.

[0066] The fault injection machine consists of a power control box, an industrial computer, a display, a signal generator, a bus module, a signal adapter box, an interface adapter, a power supply, and host computer software; it also includes a fault injection disconnection simulation interface device.

[0067] The PXI fault injection computer uses an 18-slot PXI chassis and incorporates non-bus-based cards including: discrete input / output cards, analog input / output cards, resistance output cards, resolver output cards, frequency output cards, and LVDT / RVDT output cards. Because fault injection requires high signal timeliness, the necessary signals are directly generated using these functional cards to improve the response time of the fault injection system's excitation. The functional cards and the PXI computer work together to function as a signal generator.

[0068] The PCI industrial computer has multiple built-in bus boards and performs fault injection management computer functions. The bus boards include: 1394B board, AFDX board, ARINC429 board and RS422 / 485 board. The fault management computer is interconnected with the PXI host through a switch and can synchronize clocks with other systems. It can perform bus communication with electromechanical semi-physical simulation systems and DSI systems.

[0069] The signal adapter box facilitates signal conversion, matching, and connection between the signal generator and the fault injection disconnection simulation interface device. The signal adapter box panel features disconnection terminals; all input and output signals from the fault injection system are disconnected before entering the test system. The fault injection signal should be a standard signal. According to metrological requirements, all output signals need to be calibrated. The disconnection terminals can be used to perform metrological verification of the analog signals of the fault injection system. The signal adapter box contains a relay board to provide discrete on / off status control outputs for the system. It also includes a hard-wired on / off status acquisition unit for the fault injection disconnection simulation device, enabling on / off status acquisition and conversion.

[0070] The fault injection disconnection simulation interface device enables programmable switching between bus and non-bus signals, completing the switching control of data channels between the fault injection system, signal excitation system, and test specimen. This switching device uses an FPGA as the main controller, connected to the fault management computer via Ethernet, receiving switching commands from the fault management computer to complete fault signal injection and channel switching. The fault injection disconnection simulation interface device consists of a bus switching device and a discrete analog quantity switching device. The switching device has a built-in switching matrix that can control the switching between test simulation signals, fault injection signals, and test specimen signals, meeting the fault injection requirements of the fault injection system under specific test conditions. The switching matrix board has a switching status reading function, enabling the switching matrix to read back the switching status, report the switching matrix control status at any time, upload it to the fault management computer via Ethernet, and display it in real time on the software interface.

[0071] The interface adapter completes the input of test simulation bus signals and non-bus signals through a standard aviation connector. The adapter converts the input hardwired lines before outputting them. The output interface uses a high-density connector. The output signal, depending on the signal type, enters the bus switching matrix and discrete analog switching matrix of the fault injection disconnection simulation interface device, and is then output after passing through the matrices. The output signal connects to the bus aviation connector interface and the discrete analog aviation connector interface of the interface adapter, and finally connects to the actual test piece via a dedicated adapter cable through the standard aviation connector interface.

[0072] In summary, this invention combines disconnection and switching equipment with a fault injection master computer, employing an electrically controlled disconnection and programmable fault injection method. Relying on a test master control network, it solves the problems of low fault injection coverage, low efficiency, and difficulty in achieving cross-linking tests in traditional electromechanical integrated testing. Simultaneously, the master computer supports an operating interface and can be expanded to include fault injection operations, exporting test results, simulation, and analysis of fault injection test data. This design method is easily portable and can be adapted to different testing needs, exhibiting good versatility.

[0073] The above description merely illustrates embodiments of the present invention and is quite specific and detailed; however, it should not be construed as limiting the scope of the patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Furthermore, any parts of the present invention not described in detail are conventional techniques.

Claims

1. A fault injection system for avionics integrated test, characterized in that, The system comprises: a disconnecting and switching device, a fault injection host computer, the disconnecting and switching device is used for generating a fault signal of a hard wire and completing switching of connection of the fault injection host computer and a terminal of an electromechanical integrated system on an electromechanical bus; the fault injection host computer is used for controlling hard-wire electric control switching, electromechanical system bus switching, cooperation with an exciter, and behavior simulation of a fault terminal; the fault injection host computer simulates data processing and bus transceiving behavior of the fault terminal, and tests whether other bus devices respond as expected; the disconnecting and switching device comprises a plurality of hard-wire disconnecting modules and a bus switching module, the hard-wire disconnecting module comprises a relay submodule and an internal bus coupler, the hard-wire disconnecting module receives a control signal of an internal bus of the fault injection system, completes target electric control disconnecting fault injection, and realizes manual on / off and short-circuit actions; the bus switching module is used for completing intervention of the fault injection host computer, and switching of relevant buses of the electromechanical system between an original terminal and a fault injection machine through high-speed digital isolation technology; the fault injection host computer is specifically used for: communicating with an exciter in a test system, and sending a predetermined fault signal to a terminal of an electromechanical system through the exciter; wherein the fault signal is a voltage or current target communication interface, and a specified mode of the fault signal comprises complete definition, superposition and gain; the complete definition mode is that the exciter injects a signal with a waveform specified by the fault injection host computer into the terminal; the superposition mode is that original output of the exciter is superposed with noise or drift defined by the fault injection host computer; and the gain mode is that original output of the exciter is subjected to gain defined by the fault injection host computer; executing a fault injection script, and sending on / off / short-circuit signals through a hard-wire disconnecting panel to control the exciter to send the fault signal and complete time synchronization of fault signal injection; injecting a fault into an electromechanical system bus through a bus switching panel and completing time synchronization of signal injection; cooperating with a test master control network, and performing linkage testing according to an agreed data exchange protocol and time synchronization mechanism; providing transceiving hardware adaptation and management of an internal bus and a target electromechanical system related bus, and reading fault injection terminal interface information of a device to be tested.

2. The system of claim 1, wherein, Hardware of the system comprises a bus module, a signal generating device, a power supply control box, a signal adaptation box, a fault injection disconnecting simulation interface device, a discrete quantity analog quantity switching matrix, and an interface adaptation device; the bus module completes bus simulation functions of the fault injection system; the signal generating device completes output and collection of discrete quantities and analog quantities of the fault injection system; the power supply control box completes power supply control of a test piece or a system to be tested, an input end of the power supply control box is a high-precision 28V DC process control power supply, a plurality of power supply output control single modules are arranged in the power supply control box, and independent output control of any one power supply is realized, power-on and power-off control is provided for the fault injection test piece, and a control module communicates with the fault injection host computer through a 485 bus, receives and executes instructions of the computer. The signal adapting box adopts an upper rack design, completes signal conversion and distribution, performs signal electrical characteristic matching, has anti-misplug design, and keeps consistent signal interface state with the test piece; a disconnecting block is arranged on the panel, all signals of the fault injection system are controlled to be disconnected through the disconnecting block, and the disconnecting block also completes metering and calibration of various types of signals; the signal adapting box also integrally has a relay board for outputting on-off state signals; The fault injection disconnecting simulation interface equipment is used for program-controlled switching of bus signals and non-bus signals, and completes switching control of a data channel among the fault injection system, the signal excitation system and the test real piece. The discrete quantity and analog quantity switching matrix is used for channel switching control of discrete quantity and analog quantity. The interface adapting device adopts a rack design, and the panel is divided into a test simulation signal input area and a standard connector interface output area according to regions; the test simulation signal input area connector is connected with the electromechanical subsystem exciter connector, the fault injection disconnecting simulation interface equipment is used to switch back the function of the interface adapting device, the subsystem excitation signal is introduced into the test piece, and the fault injection system excitation signal is output to the test piece through the connector interface by the switching matrix card.

3. The system of claim 2, wherein, The fault injection disconnecting simulation interface equipment takes an FPGA as a main controller, is connected with the fault management computer through Ethernet, receives the switching instruction of the fault management computer, and completes fault signal injection and channel switching.

4. The system of claim 3, wherein, The fault injection disconnecting simulation interface equipment is composed of a bus switching device and a discrete quantity and analog quantity switching device, the switching device has a built-in switching matrix, and is used for switching control of test simulation signals, fault injection signals and test piece real signals.

5. The system of claim 3, wherein, The signal adapting box performs signal conversion, matching and connection between the signal generating device and the fault injection disconnecting simulation interface equipment; disconnecting terminals are arranged on the panel of the signal adapting box, and all input and output signals of the fault injection system enter the test system after being disconnected.

6. The system of claim 3, wherein, The bus module is composed of a PCI industrial computer and a bus board card.

7. The system of claim 3, wherein, The signal generating device is composed of a PXI industrial computer and multiple functional board cards.

8. The system of claim 3, wherein, The discrete quantity and analog quantity switching matrix includes a relay card.

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