Engine fault diagnosis key parameter redundancy measurement method

Abstract

The invention provides an engine fault diagnosis key parameter redundancy measurement method, which belongs to the technical field of engine test, and adopts two paths of data acquisition modules to acquire engine operation parameters of the same measurement point, the engine operation parameters are used for fault diagnosis of an engine, and even if one path of sensor fails, the fault can be accurately detected. And the other path of sensor can still collect data normally, so that the continuity and availability of the data are ensured, and the risk of failure of the whole diagnosis process caused by the fault of a single sensor is reduced. Meanwhile, the collected two paths of engine fault diagnosis key parameters are respectively sent to a data collection system and a fault diagnosis system of the engine, and under the mode of the two paths of collection modules, even if one path of network goes wrong, the other path of data can still be normally transmitted through the other path (sent to different systems). The influence of network faults on data acquisition is reduced, it is guaranteed that the data can be sent to a corresponding system to be processed, and the risk of single-point failure is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of engine test, and particularly relates to a redundant measurement method for key parameters in engine fault diagnosis. Background Art

[0002] Most liquid rocket attitude and orbit control engines are used in the space flight of aircraft to adjust the attitude and orbit of the aircraft. Therefore, during the development of orbit control engines, it is necessary to simulate the real space environment for hot fire tests. The high-altitude simulation test system is complex, with many measurement parameters, and requires the cooperation of multiple links and systems. Once accidents such as explosions and fires occur during the test, the scope of harm is large and the involved range is wide. Therefore, it is necessary to perform fault diagnosis on the key parameters of key links during the test. When it is judged that the current state is abnormal according to certain rules, early warning is given and relevant measures are taken immediately, which can improve the success rate of the test, reduce unnecessary damage to the test products, and shorten the development cycle to a certain extent.

[0003] Currently, the parameter data participating in fault diagnosis is sent by each acquisition system to the fault diagnosis software through the network for judgment. In actual use, this data acquisition method has a high risk of single-point failure due to problems such as sensor failures, network data packet sending and parsing errors, and acquisition system anomalies. Summary of the Invention

[0004] In order to solve the single-point failure problem that appears in current engine fault diagnosis, the present invention proposes a redundant measurement method for key parameters in engine fault diagnosis, specifically a real-time monitoring redundant measurement method for key parameters for fault early warning during the ignition process of high-altitude simulation tests of attitude and orbit control engines, so as to improve the reliability and safety of the operation of the fault diagnosis system and provide guarantee for the smooth progress of the test.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A redundant measurement method for key parameters in engine fault diagnosis, comprising:

[0007] Collecting engine operation parameters of the same measurement point through at least two data acquisition modules, where the engine operation parameters are used for engine fault diagnosis;

[0008] Sending the two collected key parameters for engine fault diagnosis to the data acquisition system and the fault diagnosis system of the engine respectively.

[0009] Preferably, the data acquisition module is a sensor for measuring engine operation parameters, and the type of the sensor is a single-output sensor or a dual-output sensor.

[0010] Preferably, if the pipeline conditions and installation space permit, the type of the sensor is a single-output sensor. The signal input ends of two single-output sensors are connected to the same measuring point through a tee adapter device, and the output signals of the two single-output sensors are respectively connected to a data acquisition system and a fault diagnosis system.

[0011] Preferably, if the pipeline conditions and installation space are limited, the type of the sensor is a dual-output sensor. The input ends of the dual-output sensor are both connected to the same measuring point, and the two output signals are respectively connected to a data acquisition system and a fault diagnosis system.

[0012] Preferably, signal isolation modules are respectively arranged between the dual-output sensor and the data acquisition system and the fault diagnosis system.

[0013] Preferably, the sensor includes a pressure sensor for measuring the air pressure of the engine, a liquid level sensor for measuring the fuel liquid level, and a temperature transmitter for measuring the coolant temperature.

[0014] Preferably, a fault diagnosis software also receives the engine operation parameters sent by the data acquisition system and the fault diagnosis system in real time. Through relevant judgment rules in the fault diagnosis software, the same parameters collected by the data acquisition system and the fault diagnosis system are compared simultaneously to determine whether there is an abnormality in the current system state and eliminate the wrong decision caused by the measurement error of the sensor.

[0015] The key parameter redundant measurement method for engine fault diagnosis provided by the present invention has the following beneficial effects:

[0016] The present invention collects the engine operation parameters of the same measuring point through two data acquisition modules. Even if one of the sensors fails, the other sensor can still collect data normally, ensuring the continuity and availability of the data and reducing the risk of the entire diagnosis process failing due to the failure of a single sensor. At the same time, the two key parameters for engine fault diagnosis collected are respectively sent to the data acquisition system and the fault diagnosis system of the engine. In the case of two data acquisition modules, even if there is a problem with one of the networks, the other data can still be normally transmitted through another path, reducing the impact of network faults on data acquisition, ensuring that the data can be sent to the corresponding system for processing, and avoiding the risk of single-point failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention and its design solutions, the following will briefly introduce the drawings required for this embodiment. The drawings described below are only partial embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1This is the flowchart of the key parameter redundancy measurement method for engine fault diagnosis in Embodiment 1 of the present invention. Detailed implementation manners

[0019] In order to enable those skilled in the art to better understand the technical solutions of the present invention and be able to implement them, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and cannot be used to limit the protection scope of the present invention.

[0020] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the technical solutions of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0021] In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that unless otherwise clearly specified or limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In the description of the present invention, unless otherwise stated, the meaning of "plurality" is two or more, which will not be elaborated here.

[0022] Embodiment 1

[0023] Accurately obtaining the key parameters for fault diagnosis of the attitude and orbit control engine in the high-altitude simulation test is a necessary condition to ensure the safe progress of the test. The main purpose of the present invention is to provide a key parameter redundancy measurement method for engine fault diagnosis, which can accurately, real-time, and efficiently obtain the data of the key parameters of the high-altitude simulation test system. By analyzing the measured values of the key parameters, it is ensured that early warnings are given in a timely manner for abnormal situations occurring during the test, so that the test system is in a safe and stable state.

[0024] Specifically, the key parameter redundancy measurement method for engine fault diagnosis proposed by the present invention can be used in the high-altitude simulation test of liquid rocket engines, which is convenient for monitoring and warning the test ignition process. As Figure 1 shown, this method includes the following steps:

[0025] Step 1: Collect the engine operating parameters of the same measurement point through at least two data acquisition modules. The engine operating parameters are used for engine fault diagnosis, specifically including:

[0026] In this embodiment, the data acquisition module is a sensor for measuring engine operating parameters. Determine the measurement point position of the key parameters for fault diagnosis, and select the type of sensor according to the installation space at the measurement point position and the product interface pipeline. In this implementation, the type of sensor is a single-output sensor or a dual-output sensor. Among them, the sensors include a pressure sensor for measuring the air pressure of the engine, a liquid level sensor for measuring the fuel level, and a temperature transmitter for measuring the coolant temperature.

[0027] Further, if the pipeline conditions and installation space permit, connect the signal input ends of two single-output sensors to the same measurement point through a tee adapter device, and the output signals of the single-output sensors are respectively connected to the data acquisition system and the fault diagnosis system.

[0028] If the pipeline conditions and installation space are limited, directly install a dual-output sensor, connect the input ends of the dual-output sensor to the same measurement point, and the two output signals are respectively connected to the data acquisition system and the fault diagnosis system.

[0029] At the same time, the measurement sensitive elements inside the dual-output sensor are independent, but the power supply excitation is shared. There will be an abnormal output result problem caused by different line impedances after the shared excitation is connected to different measurement systems. Therefore, signal isolation modules need to be connected to the two output ends of the sensor respectively to eliminate the abnormal measurement result problem caused by the individual differences of different back-end lines and acquisition systems.

[0030] Connect the isolation module to the sensor output end first, and separate the power supply excitation and the output signal to prevent the two signals from interfering with each other. To achieve the above purpose, it is necessary to transform each storage tank. In this embodiment, when installing the corresponding pressure sensor, liquid level sensor and temperature transmitter, establish data transmission between each sensor and the adjacent sub-station. The sub-station can not only supply power to the corresponding transmitter, but also measure the corresponding parameters. For different types of sensors, the signals are isolated and then output, and the data acquisition system and the fault diagnosis acquisition system are used to collect the signals respectively.

[0031] Step 2: Send the two key parameters for engine fault diagnosis collected to the engine data acquisition system and the fault diagnosis system respectively.

[0032] Step 3: The fault diagnosis software receives the engine operation parameters sent by the data acquisition system and the fault diagnosis system in real time through the network. The judgment mechanism of the fault diagnosis system compares the data collected by its own system with the data transmitted by the data acquisition system through the network in real time. Through multi-data comparison and judgment, the present invention can effectively diagnose the test system and the relevant process states, make judgments in advance, with high accuracy and large fault tolerance rate. Compared with the previous method of only making corresponding emergency treatment measures after manual real-time judgment, it can conduct risk judgment and early warning in advance, reduce the probability of accidents, and improve the test success rate.

[0033] Through the relevant judgment rules in the fault diagnosis software, the same parameter collected by the data acquisition system and the fault diagnosis system is compared simultaneously to determine whether there is an abnormality in the current system state and eliminate the wrong decision caused by sensor measurement errors.

[0034] The present invention also builds a key parameter acquisition and measurement system for the high-altitude simulation test of the attitude and orbit control engine according to the redundant measurement method of the key parameters for engine fault diagnosis, realizes the redundant measurement of the key parameters, and ensures the safety and reliability of the high-altitude simulation test process of the attitude and orbit control engine.

[0035] The advantages of the redundant measurement method of the key parameters for engine fault diagnosis provided by the present invention are as follows:

[0036] First, reduce the risk of single-point failure.

[0037] Cope with sensor failures: In the traditional method, if a certain sensor fails, the data of that measurement point will be missing or incorrect, resulting in the fault diagnosis software being unable to obtain accurate information, thereby affecting the diagnosis result. When using a two-channel data acquisition module, even if one of the sensors fails, the other sensor can still collect data normally, ensuring the continuity and availability of the data, and reducing the risk of the entire diagnosis process failing due to a single sensor failure.

[0038] Reduce the impact of network problems: The traditional method relies on the network to send and parse data packets. Once there is an error in sending and parsing network data packets, it will lead to data transmission failure or data error, and the fault diagnosis software cannot receive the correct data. In the case of a two-channel acquisition module, even if there is a problem with one of the networks, the other data can still be normally transmitted through another path (sent to a different system), reducing the impact of network failures on data acquisition, and ensuring that the data can be delivered to the corresponding system for processing.

[0039] Avoid the impact of abnormal acquisition system: When the acquisition system malfunctions, the data of this measurement point cannot be collected and transmitted properly in the traditional method. However, the two-channel acquisition modules work separately. If one acquisition system malfunctions, the other acquisition system can still independently complete the tasks of data collection and transmission, ensuring that at least one channel of data can be correctly obtained and utilized, thus preventing the entire fault diagnosis process from being unable to proceed due to a single-point failure of the acquisition system.

[0040] Second, improve data accuracy and reliability.

[0041] Data comparison and verification: After the two-channel acquisition modules collect the data of the same measurement point, the two-channel data can be compared and analyzed. Since the two-channel acquisition modules are independent of each other, when there are differences between the two-channel data, possible problems can be found through comparative analysis. For example, one channel of data may be interfered or there may be deviations in the acquisition module itself, thus correcting and verifying the data to improve data accuracy. For example, if the engine temperature data collected by one channel is quite different from that of the other channel, through comparative analysis, it can be determined whether it is a sensor failure or other factors causing the deviation, and then corresponding measures can be taken.

[0042] Enhance data credibility: In fault diagnosis, data from multiple independent sources is more credible. The two-channel acquisition modules provide two independent data sources, enabling the fault diagnosis software to have more reliable data support when judging the engine status. Even if there are certain errors in one channel of data, combined with the other channel of data, the actual operating conditions of the engine can be judged more accurately, reducing misdiagnosis or missed diagnosis caused by inaccurate data.

[0043] Third, improve the stability and fault tolerance of the system.

[0044] Ensure continuous operation of the system: The method of two-channel data acquisition modules and separate transmission to different systems enhances the fault tolerance of the system. When a problem occurs in a certain link, the system can still use the normal data of the other channel to continue the fault diagnosis work, ensuring the continuous operation of the fault diagnosis system. For example, if the data acquisition system fails, the fault diagnosis system can still perform a preliminary diagnosis through the data directly sent by the other channel, preventing the entire diagnosis work from coming to a complete standstill.

[0045] Simplify the fault troubleshooting process: When data anomalies or inaccurate diagnosis results occur, the two-channel data acquisition method helps to troubleshoot the cause of the fault more quickly. By comparing the transmission paths of the two-channel data, the status of the acquisition modules, etc., it is possible to more quickly locate whether the problem lies in the sensor, network, acquisition system or other links, shortening the fault troubleshooting time and improving the maintenance efficiency of the system.

[0046] It should be noted that the specific embodiments described above can enable those skilled in the art to understand the present invention more comprehensively, but do not limit the present invention in any way. Therefore, although this specification and the embodiments have described the present invention in detail, those skilled in the art should understand that the present invention can still be modified or equivalently replaced; and all technical solutions and improvements that do not depart from the spirit and scope of the present invention are covered by the protection scope of the patent of the present invention. Any reference signs in the claims should not be construed as limiting the claimed claim. Any simple changes or equivalent replacements of technical solutions that can be obviously obtained by any person skilled in the art within the technical scope disclosed by the present invention all belong to the protection scope of the present invention.

Claims

1. A redundant measurement method for key parameters of engine fault diagnosis, characterized in that: include: Collecting engine operating parameters at the same measuring point through at least two data acquisition modules, wherein the engine operating parameters are used for engine fault diagnosis; The two collected key parameters for engine fault diagnosis are sent to the engine's data acquisition system and fault diagnosis system respectively.

2. The redundant measurement method for key parameters of engine fault diagnosis according to claim 1 is characterized in that: The data acquisition module is a sensor for measuring engine operating parameters, and the type of the sensor is a single-output sensor or a dual-output sensor.

3. The redundant measurement method for key parameters of engine fault diagnosis according to claim 2 is characterized in that: If pipeline conditions and installation space permit, the type of sensor is a single-output sensor. The signal input ends of the two single-output sensors are connected to the same measuring point through a three-way adapter, and the output signals of the two single-output sensors are respectively connected to the data acquisition system and the fault diagnosis system.

4. The redundant measurement method for key parameters of engine fault diagnosis according to claim 2 is characterized in that: If the pipeline conditions and installation space are limited, the type of the sensor is a dual-output sensor, the input ends of the dual-output sensor are connected to the same measuring point, and the two output signals are respectively connected to the data acquisition system and the fault diagnosis system.

5. The redundant measurement method for key parameters of engine fault diagnosis according to claim 4 is characterized in that: The method also includes setting signal isolation modules respectively between the dual-output sensor and the data acquisition system and the fault diagnosis system.

6. The redundant measurement method for key parameters of engine fault diagnosis according to claim 2 is characterized in that: The sensors include a pressure sensor for measuring engine air pressure, a level sensor for measuring fuel level, and a temperature transmitter for measuring coolant temperature.

7. The redundant measurement method for key parameters of engine fault diagnosis according to claim 1 is characterized in that: It also includes fault diagnosis software that receives the engine operating parameters sent by the data acquisition system and the fault diagnosis system in real time, and compares the same parameters collected by the data acquisition system and the fault diagnosis system at the same time through relevant judgment rules in the fault diagnosis software to determine whether there is any abnormality in the current system status and eliminate erroneous decisions caused by sensor measurement errors.

Images