Liquid rocket engine test run fault diagnosis method and system

Abstract

The invention provides a liquid rocket engine test run fault diagnosis method and system, and the method comprises the following steps: collecting test run process parameters in real time, and transmitting the test run process parameters to a test bed data collection system; in response to the received ignition starting signal sent by the test bed control system, the fault diagnosis module extracts fault diagnosis analysis data from the test bed data acquisition system; the fault diagnosis module performs real-time fault diagnosis analysis on the fault diagnosis analysis data according to preset acquisition parameters and fault parameters; when an analysis result of the real-time fault diagnosis analysis meets a preset logic diagnosis execution condition, the fault diagnosis module drives fault shutdown output hardware to output a fault shutdown signal to a test bed control system; after the test bed control system receives the fault shutdown signal, an emergency shutdown program is automatically executed, and engine emergency shutdown is completed through engine control hardware and an actuator. The engine test run fault diagnosis efficiency is improved, and damage of faults to the engine and the test run bench is reduced.

Description

Technical Field

[0001] This application relates to the field of liquid rocket engine technology, and in particular to a method and system for diagnosing faults during liquid rocket engine testing. Background Technology

[0002] From development to production, liquid rocket engines require multiple full-engine hot-fire tests to verify product status and obtain technical data. During these tests, due to the immaturity of the technology and processes of the products under development, engine malfunctions frequently occur, leading to engine leaks, combustion, or even explosions. This causes incalculable damage to the engine and test stand, hindering product development progress. In the past, manual fault diagnosis and emergency shutdown procedures were often used during testing. This involved observing the engine status remotely via video, visually identifying abnormalities, manually determining the fault, and manually shutting down the engine to prevent further escalation of the accident.

[0003] This manual fault diagnosis and emergency shutdown method relies heavily on the experience of command personnel, making it impossible to quantitatively and predictively diagnose engine faults, let alone execute emergency shutdown procedures in a timely manner. Faults can only be identified visually after they occur, based on the visible phenomena they cause (major mechanical damage, gas or liquid leaks, fire or smoke, explosions, etc.). This results in a significant delay in fault response and fails to meet the high-frequency, high-quality testing requirements of modern liquid rocket engine development.

[0004] Therefore, the urgent technical problem to be solved is how to provide a method and system for diagnosing faults during liquid rocket engine testing, so as to improve the efficiency of fault diagnosis during engine testing and reduce the damage of faults to the engine and test stand. Summary of the Invention

[0005] The purpose of this application is to provide a method and system for diagnosing faults during the test of a liquid rocket engine, thereby improving the efficiency of fault diagnosis and reducing the damage to the engine and test stand caused by faults.

[0006] To achieve the above objectives, as a first aspect of this application, this application provides a method for fault diagnosis during the test of a liquid rocket engine. The method includes the following steps: pre-setting acquisition parameters and fault diagnosis parameters; real-time acquisition of test process parameters through sensor measuring points on the engine under test, and sending the test process parameters to the test stand data acquisition system; in response to receiving an ignition start signal from the test stand control system, the fault diagnosis module extracts fault diagnosis analysis data from the test stand data acquisition system; the fault diagnosis module performs real-time fault diagnosis analysis on the fault diagnosis analysis data according to the preset acquisition parameters and fault parameters; when the analysis result of the real-time fault diagnosis analysis meets the preset execution logic diagnosis conditions, the fault diagnosis module drives the fault shutdown output hardware to output a fault shutdown signal to the test stand control system; after receiving the fault shutdown signal, the test stand control system automatically executes the emergency shutdown procedure and completes the emergency shutdown of the engine through the engine control hardware and actuators.

[0007] The liquid rocket engine test fault diagnosis method described above includes setting fault diagnosis parameters by: setting multiple basic data diagnostic items; setting multiple process logic diagnostic items; and setting one execution logic diagnostic item.

[0008] The liquid rocket engine test fault diagnosis method described above includes a fault diagnosis module that performs real-time fault diagnosis analysis on fault diagnosis analysis data according to preset acquisition parameters and fault parameters. This includes: performing diagnostic analysis on basic data based on the fault diagnosis analysis data to obtain basic data diagnosis results; performing process logic diagnostic analysis based on the basic data diagnosis results to obtain process logic diagnosis results; and performing execution logic diagnostic analysis based on the basic data diagnosis results and process logic diagnostic results to obtain execution logic diagnosis results.

[0009] The liquid rocket engine test fault diagnosis method described above involves a process logic diagnosis that uses multiple basic data diagnosis results as logical inputs and performs logical operations according to the fault diagnosis settings to obtain the process logic diagnosis result.

[0010] The liquid rocket engine test fault diagnosis method described above uses the results of multiple basic data diagnoses and / or process logic diagnoses as input. When the number of fault states is greater than or equal to a set value, a fault is determined and a fault shutdown signal is triggered.

[0011] The liquid rocket engine test fault diagnosis method described above includes the following steps for basic data diagnosis analysis: independently analyzing and diagnosing the fault diagnosis analysis data of each channel according to the fault diagnosis parameter settings; and obtaining and saving the basic data diagnosis results based on whether the processed data exceeds a set threshold within a set time period.

[0012] The liquid rocket engine test fault diagnosis method described above includes the following parameter settings: selecting the acquisition channel involved in the fault diagnosis, the sampling frequency, the filtering method, and the data validity verification rules.

[0013] The liquid rocket engine test fault diagnosis method described above includes setting basic data diagnosis items such as: setting fault name, diagnosis time window, upper and lower limit thresholds, normal working range, diagnosis method, and number of consecutive fault confirmations for each acquisition channel.

[0014] As a second aspect of this application, this application provides a liquid rocket engine test fault diagnosis system, which executes the liquid rocket engine test fault diagnosis method. The system includes: a test stand data acquisition system and a test stand control system; the test stand data acquisition system is communicatively connected to the test stand control system; a fault diagnosis module runs on the test stand data acquisition system; the test stand control system sends a control signal to the engine under test; sensor measuring points are set on the engine under test; the test stand data acquisition system receives test process parameters collected in real time by the sensor measuring points on the engine under test; in response to receiving an ignition start signal from the test stand control system, the fault diagnosis module extracts fault diagnosis analysis data from the test stand data acquisition system; the fault diagnosis module performs real-time fault diagnosis analysis on the fault diagnosis analysis data according to preset acquisition parameters and fault parameters; when the analysis result of the real-time fault diagnosis analysis meets the preset execution logic diagnosis conditions, the fault diagnosis module drives the fault shutdown output hardware to output a fault shutdown signal to the test stand control system; after receiving the fault shutdown signal, the test stand control system automatically executes the emergency shutdown procedure and completes the emergency shutdown of the engine through the engine control hardware and actuators.

[0015] The liquid rocket engine test fault diagnosis system described above includes an emergency shutdown procedure and engine control hardware. After the emergency shutdown procedure is executed, the engine control hardware is driven to operate according to a certain timing sequence, and a shutdown control signal is sent to the actuator of the engine under test to complete the fault shutdown.

[0016] The beneficial effects achieved by this application are as follows:

[0017] (1) The method of this application is based on the test bench measurement and control system. It uses the test bench data acquisition system to diagnose engine test faults and automatically realizes fault diagnosis and emergency shutdown through computer programs. It is easy to operate and maintain. Compared with manual fault judgment and emergency shutdown, this application has high diagnostic efficiency, less reliance on manual labor, can predict faults, and stop the engine in advance, thus better protecting the engine and test bench and avoiding the escalation of test accidents.

[0018] (2) This application achieves low-cost fault diagnosis of liquid rocket engine test benches by modifying the test control system. It can effectively predict engine faults in advance using a simple and easy-to-use method, and automatically execute the shutdown sequence in a timely manner to prevent faults and subsequent accidents, thus protecting the engine and test bench. Compared with existing manual fault diagnosis and emergency shutdown methods, it is safer and more timely, does not rely on the experience of the operators, and can effectively improve the technical level and testing efficiency of the engine test bench. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings.

[0020] Figure 1 The flowchart of a liquid rocket engine test fault diagnosis method according to an embodiment of this application is as follows. Figure 1 .

[0021] Figure 2 This is a schematic diagram of a liquid rocket engine test fault diagnosis system according to an embodiment of this application.

[0022] Figure 3 The flowchart of a liquid rocket engine test fault diagnosis method according to an embodiment of this application is as follows. Figure 2 .

[0023] Figure reference numerals: 1-Sensor measuring point; 2-Signal from sensor measuring point to data acquisition system; 3-Test bench data acquisition system; 4-Fault diagnosis module; 5-Fault shutdown output hardware; 6-Fault shutdown signal; 7-Ignition start signal; 8-Test bench control system; 9-Emergency stop procedure; 10-Engine control hardware; 11-Control signal; 12-Actuator; 13-Engine to be tested. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0025] like Figure 1 and 3 As shown, this application provides a method for diagnosing faults during the test run of a liquid rocket engine, which includes the following steps:

[0026] Step S1: Pre-set the acquisition parameters and fault diagnosis parameters.

[0027] The data acquisition parameter settings include: selecting the acquisition channel, sampling frequency, filtering method, and data validity verification rules to ensure that the data used for fault diagnosis is accurate and reliable.

[0028] In a specific embodiment of the present invention, the fault diagnosis module runs on the test bench data acquisition system, analyzing the acquired data to achieve fault diagnosis. The prerequisite for fault diagnosis operation is that the acquisition system is correctly configured and running. Before the system runs, it needs to be configured to ensure that the acquisition channels involved in fault diagnosis are working properly and the data is accurate. Configuring the acquisition system includes setting the acquisition parameters.

[0029] As a specific embodiment of the present invention, setting fault diagnosis parameters includes:

[0030] Step S110: Set up multiple basic data diagnostic items.

[0031] As a specific embodiment of the present invention, the basic data diagnostic items include: setting a fault name, diagnostic time window, upper and lower thresholds, normal operating range, diagnostic method (multi-point average exceeding limit or continuous multi-point exceeding limit), and number of consecutive fault confirmations for each acquisition channel. Fault diagnosis analysis of the basic data is performed based on the set basic data diagnostic items.

[0032] As a specific embodiment of the present invention, the basic data diagnostic items include:

[0033] 1) Set the fault name;

[0034] 2) Select the corresponding unique acquisition channel;

[0035] 3) Set the time range for fault diagnosis execution (with the ignition signal as the zero point);

[0036] 4) Set upper and lower thresholds for data diagnosis. Fault conditions can be below the lower limit, above the upper limit, or between the upper and lower limits.

[0037] 5) Set the normal data range and remove data that exceeds the range during diagnosis;

[0038] 6) There are two data diagnostic methods: one is multi-point average exceeding the limit, and the other is continuous multi-point exceeding the limit;

[0039] 7) To avoid misdiagnosis caused by accidental factors, the system is set to confirm the results of multiple consecutive faults.

[0040] Step S120: Set multiple process logic diagnostic items.

[0041] As a specific embodiment of the present invention, process logic diagnostic analysis is performed based on the set process logic diagnostic items. For each process logic diagnostic item, the set process logic diagnostic items include:

[0042] 1) Set the fault name;

[0043] 2) Using multiple basic data diagnostic results or process logic diagnostic results as input, perform AND, OR, NOT and other logical operations to obtain the diagnostic results;

[0044] 3) Set the time range for fault diagnosis execution (with the ignition signal as the zero point);

[0045] 4) The process logic diagnostic results are only displayed, and no fault shutdown signal is output.

[0046] Step S130: Set an execution logic diagnostic item.

[0047] As a specific embodiment of the present invention, execution logic diagnostic analysis is performed based on the set execution logic diagnostic items. Setting execution logic diagnostic items includes:

[0048] 1) Set the fault name;

[0049] 2) Using multiple basic data diagnostic results or process logic diagnostic results as input, and following the "multiple selections for multiple" principle, that is, if the number of faults in the selected multiple input logics is greater than or equal to the set number of faults, then a fault is diagnosed and a diagnostic result is obtained;

[0050] 3) Set the time range for fault diagnosis execution (with the ignition signal as the zero point);

[0051] 4) Execute the logic diagnostic results and output a fault shutdown signal.

[0052] The software interface allows users to preset data acquisition parameters and fault parameters. After setting the parameters, data acquisition begins, and the system waits for the ignition start signal from the test bench control system.

[0053] Step S2: Real-time acquisition of test process parameters through sensor measuring points on the engine under test, and sending the test process parameters to the test bench data acquisition system.

[0054] Step S2 includes:

[0055] Step S210: Install the sensor measuring points onto the engine to be tested.

[0056] Step S220: Real-time acquisition of test process parameters of the engine under test through sensor measuring points.

[0057] Step S230: Send the test process parameters to the test stand data acquisition system.

[0058] In step S3, in response to receiving the ignition start signal from the test bench control system, the fault diagnosis module extracts fault diagnosis analysis data from the test bench data acquisition system.

[0059] Step S3 includes:

[0060] In step S310, in response to receiving the ignition start signal from the test bench control system, the fault diagnosis module extracts fault diagnosis analysis data from each acquisition channel of the test bench data acquisition system.

[0061] As a specific embodiment of the present invention, the fault diagnosis analysis data is the test process data of each acquisition channel involved in the fault diagnosis.

[0062] Step S320: Classify and store the fault diagnosis analysis data of different acquisition channels.

[0063] Step S4: The fault diagnosis module performs real-time fault diagnosis analysis on the fault diagnosis analysis data according to the preset acquisition parameters and fault parameters.

[0064] As a specific embodiment of the present invention, after the fault diagnosis module receives the ignition start signal, the fault diagnosis program starts running.

[0065] Step S4 includes:

[0066] Step S410: Based on the fault diagnosis analysis data, perform diagnostic analysis on the basic data to obtain the basic data diagnosis results.

[0067] Based on the fault diagnosis parameter settings, the fault diagnosis analysis data for each channel is analyzed and diagnosed independently. The basic data diagnosis result is derived and saved primarily based on whether the processed data within a set time exceeds a set threshold. If the processed data exceeds the set threshold, the data is considered abnormal; otherwise, the data is considered normal.

[0068] Step S420: Based on the basic data diagnostic results, perform process logic diagnostic analysis to obtain process logic diagnostic results.

[0069] As a specific embodiment of the present invention, process logic diagnosis is a logical combination judgment of the analysis and diagnosis results (basic data diagnosis results) of multiple independent channels in the previous step. It uses the multiple basic data diagnosis results in the previous step as logical input, performs logical operations according to the fault diagnosis settings, and obtains the process logic diagnosis result.

[0070] In a specific embodiment of the present invention, the process logic diagnostic results are only displayed and not output as fault shutdowns. However, they can be used as input for performing logic diagnostics to achieve more complex logical operations.

[0071] Step S430: Based on the basic data diagnostic results and the process logic diagnostic results, perform execution logic diagnostic analysis to obtain the execution logic diagnostic results.

[0072] As a specific embodiment of the present invention, the logic diagnosis is performed: the results of multiple basic data diagnoses and / or process logic diagnoses are used as input, and when the number of those in fault states is greater than or equal to a set value, a fault is determined and a fault shutdown signal is triggered.

[0073] As a specific embodiment of the present invention, the execution logic can perform logical operations with either the basic data diagnosis result or the process logic diagnosis result as input. When a fault occurs, it will drive the fault shutdown output hardware action and send a fault shutdown signal to the test bench control system.

[0074] In a specific embodiment of the present invention, if no fault is found during logical diagnosis, the process returns to step S2 for data extraction and continues the diagnostic process in the next cycle. If a fault occurs during logical diagnosis, a fault shutdown signal is output, and the fault is saved and displayed.

[0075] Step S5: When the analysis results of the real-time fault diagnosis analysis meet the preset execution logic diagnosis conditions, the fault diagnosis module drives the fault shutdown output hardware to output a fault shutdown signal to the test bench control system.

[0076] As a specific embodiment of the present invention, the preset execution logic diagnostic condition is: among the selected diagnostic results (basic data diagnostic results or process logic diagnostic results), the number of those simultaneously in a fault state is greater than or equal to a preset number. Specifically, the results of multiple basic data diagnostics and / or process logic diagnostics are used as input, and when the number of those in a fault state is greater than or equal to a set value, the condition is met.

[0077] As a specific embodiment of the present invention, the fault diagnosis module completes the configuration of the collected parameters and fault parameters through the software interface before each test run, and supports the import, export and version management of the configuration file.

[0078] As a specific embodiment of the present invention, the fault diagnosis module automatically saves the original data, intermediate diagnostic results and shutdown logs for a specified period before and after the fault time when triggering a shutdown, and generates a visual fault report.

[0079] As a specific embodiment of the present invention, the fault shutdown output hardware adopts hard-wired or safety relay output to ensure that the fault shutdown signal can still be reliably issued when the test bench data acquisition system or software is abnormal.

[0080] In step S6, after receiving the fault shutdown signal, the test bench control system automatically executes the emergency shutdown procedure and completes the emergency shutdown of the engine through the engine control hardware and actuators.

[0081] As a specific embodiment of the present invention, the emergency shutdown procedure sequentially closes the propellant valve, cuts off the ignition energy, and activates the fire suppression and explosion extinguishing device in a preset sequence to minimize damage to the engine and test stand.

[0082] As a specific embodiment of the present invention, the implementation of fault diagnosis for the engine under test is based on the engine test bench measurement and control system. It utilizes the existing hardware of the measurement and control system and primarily implements the fault diagnosis function through software programs. The above method is achieved by reusing the existing data acquisition and control system hardware of the test bench, without requiring the addition of a separate hardware platform, and supports online upgrades of the fault diagnosis software without interrupting the normal measurement and control functions of the test bench.

[0083] This application introduces computer-aided methods for engine fault diagnosis and shutdown control. It proposes a fault diagnosis method for liquid rocket engine testing, integrated into the liquid rocket engine test stand control system. This method combines hardware and software, employing computer assistance to monitor and analyze engine test process parameters in the test stand data acquisition system, automatically performing real-time engine fault diagnosis, and combining with the test stand control system to achieve emergency shutdown of the engine in case of fault.

[0084] like Figure 2 As shown, this application provides a liquid rocket engine test fault diagnosis system, which includes: a test stand data acquisition system 3, which includes a test stand data acquisition system 3 and a test stand control system 8; the test stand data acquisition system 3 and the test stand control system 8 are communicatively connected; a fault diagnosis module 4 runs on the test stand data acquisition system 3; the test stand control system 8 sends a control signal 11 to the engine 13 under test; sensor measuring points 1 are set on the engine 13 under test; the sensor measuring points 1 send a signal 2 from the sensor measuring points to the data acquisition system 3.

[0085] As a specific embodiment of the present invention, the test bench data acquisition system 3 receives test process parameters collected in real time from sensor measuring points 1 on the engine under test 13; in response to receiving the ignition start signal 7 issued by the test bench control system 8, the fault diagnosis module 4 extracts fault diagnosis analysis data from the test bench data acquisition system 3; the fault diagnosis module 4 performs real-time fault diagnosis analysis on the fault diagnosis analysis data according to preset acquisition parameters and fault parameters; when the analysis result of the real-time fault diagnosis analysis meets the preset execution logic diagnosis conditions, the fault diagnosis module 4 drives the fault stop output hardware 5 to output a fault stop signal 6 to the test bench control system 8; after receiving the fault stop signal 6, the test bench control system 8 automatically executes the emergency stop procedure 9 and completes the emergency shutdown of the engine through the engine control hardware 10 and the actuator 12.

[0086] like Figure 2As shown, the test bench control system 8 includes an emergency stop procedure 9 and engine control hardware 10. After the emergency stop procedure 9 is executed, the engine control hardware 10 is driven to operate according to a certain timing sequence, and a stop control signal 11 is sent to the actuator 12 of the engine to be tested 13 to complete the fault stop.

[0087] The beneficial effects achieved by this application are as follows:

[0088] (1) The method of this application is based on the test bench measurement and control system. It uses the test bench data acquisition system to diagnose engine test faults and automatically realizes fault diagnosis and emergency shutdown through computer programs. It is easy to operate and maintain. Compared with manual fault judgment and emergency shutdown, this application has high diagnostic efficiency, less reliance on manual labor, can predict faults, and stop the engine in advance, thus better protecting the engine and test bench and avoiding the escalation of test accidents.

[0089] (2) This application achieves low-cost fault diagnosis of liquid rocket engine test benches by modifying the test control system. It can effectively predict engine faults in advance using a simple and easy-to-use method, and automatically execute the shutdown sequence in a timely manner to prevent faults and subsequent accidents, thus protecting the engine and test bench. Compared with existing manual fault diagnosis and emergency shutdown methods, it is safer and more timely, does not rely on the experience of the operators, and can effectively improve the technical level and testing efficiency of the engine test bench.

[0090] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0091] In the description of this application, the word "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the invention can be made without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0092] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A method for diagnosing faults during the test run of a liquid rocket engine, characterized in that, The method includes the following steps: Pre-set the data acquisition parameters and fault diagnosis parameters; The test process parameters are collected in real time by the sensor measuring points on the engine under test, and the test process parameters are sent to the test bench data acquisition system. In response to receiving the ignition start signal from the test bench control system, the fault diagnosis module extracts fault diagnosis analysis data from the test bench data acquisition system; The fault diagnosis module performs real-time fault diagnosis analysis on the fault diagnosis analysis data according to the preset acquisition parameters and fault parameters. When the analysis results of real-time fault diagnosis meet the preset execution logic diagnosis conditions, the fault diagnosis module drives the fault shutdown output hardware to output a fault shutdown signal to the test bench control system. After receiving a fault shutdown signal, the test bench control system automatically executes the emergency shutdown procedure and completes the emergency shutdown of the engine through the engine control hardware and actuators.

2. The liquid rocket engine test fault diagnosis method according to claim 1, characterized in that, Setting fault diagnosis parameters includes: Set up multiple basic data diagnostic items; Set multiple process logic diagnostic items; Set up an execution logic diagnostic item.

3. The liquid rocket engine test fault diagnosis method according to claim 1, characterized in that, The fault diagnosis module performs real-time fault diagnosis analysis on the fault diagnosis analysis data according to preset acquisition parameters and fault parameters, including: Based on the fault diagnosis analysis data, perform diagnostic analysis on the basic data to obtain the basic data diagnosis results; Based on the basic data diagnostic results, process logic diagnostic analysis is performed to obtain process logic diagnostic results; Based on the basic data diagnostic results and process logic diagnostic results, execution logic diagnostic analysis is performed to obtain execution logic diagnostic results.

4. The liquid rocket engine test fault diagnosis method according to claim 3, characterized in that, The process logic diagnosis uses multiple basic data diagnosis results as logical inputs, performs logical operations according to the fault diagnosis settings, and obtains the process logic diagnosis results.

5. The liquid rocket engine test fault diagnosis method according to claim 3, characterized in that, Using the results of multiple basic data diagnostics and / or process logic diagnostics as input, when the number of those in fault state is greater than or equal to a set value, a fault is determined and a fault shutdown signal is triggered.

6. The liquid rocket engine test fault diagnosis method according to claim 3, characterized in that, Diagnostic analysis of basic data includes: Based on the fault diagnosis parameter settings, the fault diagnosis analysis data for each channel is analyzed and diagnosed independently. Based on whether the processed data within a set time exceeds a set threshold, a basic data diagnostic result is obtained and saved.

7. The liquid rocket engine test fault diagnosis method according to claim 1, characterized in that, The data acquisition parameter settings include: selecting the acquisition channel to participate in fault diagnosis, sampling frequency, filtering method, and data validity verification rules.

8. The liquid rocket engine test fault diagnosis method according to claim 2, characterized in that, Setting basic data diagnostic items includes: setting the fault name, diagnostic time window, upper and lower thresholds, normal operating range, diagnostic method, and number of consecutive fault confirmations for each acquisition channel.

9. A liquid rocket engine test fault diagnosis system, characterized in that, The system for performing the method according to any one of claims 1-8 comprises: a test bench data acquisition system and a test bench control system; The test bench data acquisition system is communicatively connected to the test bench control system; a fault diagnosis module runs on the test bench data acquisition system. The test bench control system sends control signals to the engine under test; Sensor measuring points were installed on the engine to be tested; The test bench data acquisition system receives test process parameters collected in real time from sensor measuring points on the engine under test; In response to receiving an ignition start signal from the test bench control system, the fault diagnosis module extracts fault diagnosis analysis data from the test bench data acquisition system. The fault diagnosis module performs real-time fault diagnosis analysis on the fault diagnosis analysis data according to preset acquisition parameters and fault parameters. When the analysis results of real-time fault diagnosis and analysis meet the preset execution logic diagnosis conditions, the fault diagnosis module drives the fault stop output hardware to output a fault stop signal to the test bench control system. After receiving a fault shutdown signal, the test bench control system automatically executes the emergency shutdown procedure and completes the emergency shutdown of the engine through engine control hardware and actuators.

10. The liquid rocket engine test fault diagnosis system according to claim 9, characterized in that, The test bench control system includes an emergency stop procedure and engine control hardware; After the emergency shutdown procedure is executed, the engine control hardware is driven to operate in a certain sequence to send a shutdown control signal to the actuator of the engine to be tested, thereby completing the fault shutdown.

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