Fault combined diagnosis system and method for engine and steam injection device

Abstract

The invention discloses a fault combined diagnosis system and method for an engine and a steam injection device. The system and method are used for solving the technical problem that engine faults caused by damage to an external simulation environment cannot be diagnosed in the prior art. The diagnosis system comprises a distributed acquisition unit, a diagnosis unit and a treatment unit, and the distributed acquisition unit comprises a plurality of measurement sensors, a plurality of distributed collectors and a plurality of distributed controllers; the input end of each distributed collector is respectively connected with the output ends of one or more measuring sensors, and each distributed controller is respectively connected with the output ends of one or more distributed collectors and a diagnosis unit; the diagnosis unit is connected with the treatment unit and is used for analyzing and interpreting the parameter information and feeding back an interpretation result to the treatment unit; and the processing unit is used for respectively controlling the working state of the engine and / or the steam injection device according to the interpretation result.

Description

Technical Field

[0001] The invention relates to a high-altitude simulation test method for a liquid rocket engine, and in particular to a combined fault diagnosis system and method for an engine and a steam ejection device. Background Art

[0002] For probes or spacecraft such as lunar exploration, Mars exploration, and manned lunar landing, the engines of their power systems must undergo simulated ignition tests in high-altitude environments (i.e., vacuum environments) to verify their working performance and status in a vacuum environment. The high-altitude environment is very different from the ground environment. For example, air pressure, temperature, and humidity will all affect the operation of rocket engines. The engine's participation in high-altitude simulation tests can evaluate the thrust, specific impulse, combustion stability and other performance parameters of the rocket engine working in a high-altitude environment, and simulate the working status and working reliability of the rocket engine in actual flight.

[0003] High-altitude simulation tests usually use a steam injection system to create a vacuum environment for the engine. The steam injection system includes a steam generator, a steam jet pump, an environmental test chamber, etc. Among them, the steam generator mainly produces power steam of a certain pressure and temperature. According to the magnitude of the steam flow rate, the steam generator is usually set up in multiple groups to work in parallel to ensure the supply of steam flow. As the core component of the steam injection system, the stable and reliable combustion of the steam generator plays a very important role in the stable supply of power steam. The steam jet pump mainly uses power steam as the working medium, accelerates the power steam to a supersonic state through the nozzle, forms a certain vacuum, and then sucks and mixes the upstream incoming gas, and discharges it into the atmosphere by increasing pressure and reducing speed, thereby ensuring the upstream vacuum, that is, the vacuum when the engine is ignited. Like the steam generator, the steam jet pump can also be set up in multiple groups in parallel. The environmental test chamber mainly provides the ignition environment and space for the engine.

[0004] At present, during the high-altitude simulation test of the engine, it is generally necessary to perform fault diagnosis on the engine system. Fault diagnosis plays a vital role in the reliability, safety and performance optimization of the engine. By real-time monitoring of the operating parameters and status of the engine, emergency shutdown can be implemented before the fault occurs, thereby avoiding serious damage; at the same time, various data can be recorded during the engine test, and its fault events can be recorded to provide strong support for the subsequent analysis of the fault mode and cause, and improve the engine design and manufacturing process. However, the existing fault diagnosis usually only performs parameter diagnosis on the engine system. When conducting high-altitude simulation tests, in addition to the engine's own system, its external steam injection system is also particularly important. If the steam injection system fails during the engine ignition process, the suction capacity is insufficient, and the high-temperature gas generated by the engine cannot be discharged in time, which will cause cabin pressure instability, engine gas backflow and even engine nozzle damage. Especially for deep space exploration high-thrust engines, the thrust-to-mass ratio is required to be as high as possible. At this time, the nozzle wall thickness is very thin (less than 1mm), and the nozzle outlet diameter is large. The nozzle cannot meet the strength requirements caused by the instantaneous back pressure. If the steam generator suddenly fails, the structure of the participating engine will be destroyed. For instantaneous engine damage caused by the destruction of this external simulated environment, it is difficult to ensure product safety by simply diagnosing the engine's own faults. Timely joint measures are required when the external environment changes. Summary of the invention

[0005] The purpose of the present invention is to solve the technical problem that the prior art cannot diagnose engine faults caused by the destruction of the external simulated environment, and to provide a joint fault diagnosis system and method for an engine and a steam ejector.

[0006] To achieve the above objectives, the technical solutions provided by the present invention are:

[0007] A combined fault diagnosis system for an engine and a steam ejector, which is characterized in that it comprises a distributed acquisition unit, a diagnosis unit and a disposal unit;

[0008] The distributed acquisition unit includes a plurality of measurement sensors, a plurality of distributed collectors and a plurality of distributed controllers;

[0009] The input ends of the plurality of measuring sensors are respectively used to connect to the engine and the steam ejector device and measure the corresponding parameter information;

[0010] The input end of each of the distributed collectors is respectively connected to the output end of one or more measurement sensors, so as to supply power to the corresponding measurement sensors and collect parameter information measured by the sensors;

[0011] The input end of each of the distributed controllers is respectively connected to the output end of one or more distributed collectors, and the output end is connected to the input end of the diagnostic unit, so as to pre-process the parameter information and transmit it to the diagnostic unit;

[0012] The output end of the diagnosis unit is connected to the input end of the treatment unit, and is used to convert the parameter information into corresponding data information for analysis and interpretation, and feed back the interpretation result to the treatment unit;

[0013] The output end of the disposal unit is used to connect the actuators of the engine and the steam ejection device, and to control the working state of the engine and / or the steam ejection device through the judgment result.

[0014] Further, the diagnosis unit includes a data acquisition thread, a data classifier, a data buffer module, a data diagnosis thread, and a joint diagnosis module connected in sequence;

[0015] The input end of the data acquisition thread is connected to the output ends of all distributed controllers, and is used to collect parameter information, and convert the parameter information into data information and transmit it to the data classifier;

[0016] The data classifier is used to classify the data information into engine data information and ejection data information;

[0017] The data buffer module includes an engine data buffer and an elicitation data buffer respectively connected to the data classifier, and the data classifier transmits the engine data information to the engine diagnosis data buffer and transmits the elicitation data information to the elicitation data buffer;

[0018] The data diagnosis thread includes an engine diagnosis thread and an induced emission diagnosis thread, the input ends of which are respectively connected to the engine data buffer and the induced emission data buffer, and the output ends are respectively connected to the joint fault diagnosis module, and are respectively used to diagnose and judge the engine data information and the induced emission data information, and feed back the judgment results to the joint diagnosis module;

[0019] The joint diagnosis module is used to perform joint diagnosis according to the determination result output by the data diagnosis thread and output the final determination result.

[0020] Furthermore, the measuring sensor is a dual redundant output measuring sensor.

[0021] The present invention also provides a method for combined fault diagnosis of an engine and a steam ejector, comprising the following steps:

[0022] Step [1], according to the structural composition and test requirements of the engine and the steam ejector, determine the number and configuration of the measurement sensors, the distributed collectors and the distributed controllers, and assemble the fault joint diagnosis system of the engine and the steam ejector;

[0023] Step [2], according to the performance of the engine and the steam ejector, setting corresponding fault diagnosis rules in the diagnosis unit in advance, and setting corresponding handling rules in the handling unit;

[0024] Step [3], starting the engine and the steam ejector, obtaining corresponding parameter information through the measuring sensor, and transmitting the information to the diagnosis unit through the corresponding distributed collector and distributed controller in sequence;

[0025] Step [4], the diagnosis unit performs diagnosis analysis and interpretation of the parameter information according to the fault diagnosis rules set in step [2], and transmits the interpretation result to the disposal unit;

[0026] Step [5], the handling unit controls the working state of the engine and / or the steam ejector device accordingly based on the judgment result of step [4] and the handling rules set in step [2], thereby completing the joint diagnosis of the engine and steam ejector device faults.

[0027] Further, in step [2], the fault diagnosis rules include engine fault diagnosis rules and steam ejector fault diagnosis rules;

[0028] The engine fault diagnosis rules are implemented by a three-level rule mapping structure, which includes a mapping relationship between working time period and rule relationship, a mapping relationship between rule and parameter, and a mapping relationship between parameter and dynamic range;

[0029] The fault diagnosis rules of the steam ejector device are implemented in a classified and segmented manner. The classification and segmentation refer to dividing the water steam generator and steam jet pump in the steam ejector device into different working stages, wherein the working stage of the water steam generator includes the startup stage, the pressure building stage, and the stable stage; the working stage of the steam jet pump refers to the load operation stage.

[0030] Furthermore, step [4] is specifically as follows:

[0031] 4.1. The data acquisition thread obtains the parameter information transmitted by the distributed controller, and uses the data parsing algorithm to parse the parameter information into corresponding data information and then transmits it to the data classifier;

[0032] 4.2. The data information is divided into engine data information and ignition data information by a data classifier, and transmitted to the corresponding engine data buffer and ignition data buffer respectively;

[0033] 4.3. Use the engine diagnosis thread to obtain the corresponding data information from the engine data buffer for diagnostic analysis and interpretation, and feed back the interpretation results to the joint diagnosis module;

[0034] 4.4. Use the induced diagnosis thread to obtain the corresponding data information from the induced data buffer for diagnostic analysis and interpretation, and feed back the interpretation results to the joint diagnosis module;

[0035] 4.5. The joint diagnosis module makes a comprehensive judgment on the judgment results transmitted in step 4.3 and step 4.4, and transmits the final judgment result to the disposal unit.

[0036] Furthermore, step 4.3 is specifically as follows:

[0037] 4.3.1. Use the engine diagnosis thread to cyclically obtain the corresponding data information from the engine data buffer, and calculate the working time of the engine ignition program according to the current data accumulation number in the data information;

[0038] 4.3.2. According to the working time described in step 4.3.1, obtain the diagnostic time interval corresponding to the working time;

[0039] 4.3.3. According to the mapping relationship between working time period and rule relationship, obtain the rules, rule relationships and the current working period of the engine corresponding to the diagnostic time interval described in step 4.3.2; the rules may be one or more;

[0040] 4.3.4. Take any rule and obtain the inspection parameters corresponding to the rule according to the mapping relationship between rule and parameter; the inspection parameters may be one or more;

[0041] 4.3.5. According to the mapping relationship between parameter and dynamic range, obtain the parameter range of each inspection parameter corresponding to the rule;

[0042] 4.3.6. Based on steps 4.3.4 and 4.3.5, determine whether the rule is abnormal according to the mapping relationship between rules and parameters. If so, record it as true and execute step 4.3.8; otherwise, return to step 4.3.1;

[0043] 4.3.7. Follow the methods of steps 4.3.4 to 4.3.6 to determine whether all other rules are abnormal, and proceed to step 4.3.8;

[0044] 4.3.8. Based on the abnormality determination results of steps 4.3.6 and 4.3.7, determine whether a fault has occurred according to the mapping relationship between the working time period and the rule relationship. If so, the determination result is fed back to the joint diagnosis module in combination with the current working section of the engine described in step 4.3.3; otherwise, return to step 4.3.1.

[0045] Furthermore, step 4.4 is specifically as follows:

[0046] 4.4.1. Use the ejection diagnostic thread to cyclically obtain the corresponding data information from the ejection data buffer, and calculate the working time of the steam generator ignition program in the steam ejection device according to the current data accumulation number in the data information;

[0047] 4.4.2. Based on the working time described in step 4.4.1, obtain the working time interval corresponding to each component of the steam ejector device under the working time;

[0048] 4.4.3. According to the fault diagnosis rules of the steam ejector device, the current working section of each component of the steam ejector device and its associated parameters are obtained, and whether it is abnormal and the type of abnormality are determined. If there is an abnormality, the determination result is fed back to the joint diagnosis module; otherwise, return to step 4.4.1.

[0049] Furthermore, step 4.5 is specifically as follows: when the joint diagnosis module receives the judgment result of step 4.3.8 that the engine is emergency stop signal, the judgment result is directly transmitted to the disposal unit; when the joint diagnosis module receives the judgment result of step 4.3.8 that the engine is normal, it is further judged in combination with the judgment result of step 4.4.3, and the final judgment result is transmitted to the disposal unit.

[0050] Compared with the prior art, the present invention has the following beneficial effects:

[0051] 1. The engine and steam ejector fault combined diagnosis system of the present invention comprises a distributed acquisition unit, a diagnosis unit and a disposal unit, wherein the distributed acquisition unit comprises a plurality of measurement sensors, a plurality of distributed collectors and a plurality of distributed controllers. A set of diagnosis systems can be used to monitor and diagnose the parameters of the engine and the steam ejector simultaneously and online, thereby reducing the information exchange time difference and error rate between the engine system and the steam ejector, improving the accuracy and timeliness of data acquisition, and thus achieving the accuracy of engine fault diagnosis.

[0052] 2. In the engine and steam ejector fault joint diagnosis system of the present invention, the measurement sensor selects a dual redundant output measurement sensor, thereby ensuring the accuracy and reliability of fault diagnosis parameter acquisition in the high-altitude simulation test.

[0053] 3. In the engine and steam ejector fault joint diagnosis system of the present invention, the diagnosis unit integrates data acquisition and analysis with fault interpretation, thereby achieving the system's response speed and diagnosis efficiency.

[0054] 4. The method for joint fault diagnosis of the engine and the steam ejector of the present invention can analyze and diagnose the engine data information through the engine diagnosis thread, analyze and diagnose the ejection data information through the ejection diagnosis thread, and then output the final judgment result through the joint diagnosis module, and finally perform real-time disposal through the disposal unit, thereby realizing the joint diagnosis of the engine and the steam ejector, thereby ensuring the safety of the engine product and the steam ejector.

[0055] 5. The combined fault diagnosis method for the engine and steam ejection device of the present invention can perform online monitoring and combined diagnosis on multiple groups of steam ejection devices, minimize the change gradient of the vacuum pressure, and thus reduce the damage to the engine caused by the downstream back pressure.

[0056] 6. The combined fault diagnosis method for the engine and steam ejector of the present invention can jointly diagnose the working status of the engine and the steam ejector. When the steam ejector fails or the engine system fails, the engine system and the steam ejector can be stopped simultaneously quickly and accurately, and the response time is short. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 The present invention is a schematic structural diagram of an embodiment of a combined fault diagnosis system for an engine and a steam ejector device according to the present invention.

[0058] Figure 2 It is a structural schematic diagram of a diagnosis unit and a disposal unit in an embodiment of a combined fault diagnosis system for an engine and a steam ejector of the present invention.

[0059] Figure 3 The present invention is a flowchart of engine fault diagnosis in an embodiment of a method for combined fault diagnosis of an engine and a steam ejector device of the present invention.

[0060] Figure 4 The present invention is a flow chart of the fault diagnosis of the steam ejector device in an embodiment of the combined fault diagnosis method of the engine and the steam ejector device.

[0061] Figure 5 The present invention is a flowchart of a joint diagnosis module in an embodiment of a method for joint diagnosis of engine and steam ejector faults. DETAILED DESCRIPTION

[0062] In order to make the purpose, advantages and features of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0063] like Figure 1 As shown, this embodiment provides a joint fault diagnosis system for an engine and a steam ejector, comprising a distributed acquisition unit, a diagnosis unit and a disposal unit. The distributed acquisition unit comprises a plurality of measurement sensors, a plurality of distributed collectors and a plurality of distributed controllers.

[0064] The steam ejector is different from the rocket engine in that the system is huge and complex in composition, and the key parameter measurement points are dispersedly distributed. In order to realize the joint monitoring of important parameters of the engine system and the steam ejector, the present invention uses a distributed acquisition unit to reduce cable switching and improve the robustness of the system.

[0065] The input ends of multiple measurement sensors are respectively connected to the engine and steam ejection device, and measure the corresponding pressure, temperature, flow rate and other parameter information. The input end of each distributed collector is respectively connected to the output end of one or more measurement sensors, which is used to supply power to the corresponding measurement sensor and collect the parameter information measured by it.

[0066] In order to ensure the accuracy and reliability of fault diagnosis parameters in the high-altitude simulation test, this embodiment uses a distributed collector independent of the engine measurement system to collect fault diagnosis parameters accordingly, and the measurement sensor of the corresponding measurement point uses a dual redundant output measurement sensor. The distributed collector is set up nearby according to the location of the measurement point, which can improve the accuracy and reliability of the measurement and reduce the risk of measurement error and data loss.

[0067] The input end of each distributed controller is connected to the output end of one or more distributed collectors, and the output end is connected to the input end of the diagnostic unit, which is used to pre-process the parameter information and transmit it to the diagnostic unit. The distributed controller is used to receive the electrical signals collected by the distributed collector, process and analyze them, and filter, calibrate, convert and other operations on the data to ensure the accuracy and reliability of the data. The distributed controller coordinates and manages the entire distributed collection unit, controls the working mode, sampling frequency, data transmission, etc. of the distributed collector, and ensures the efficient operation of the system and the timely collection of data.

[0068] The output end of the diagnosis unit is connected to the input end of the treatment unit, and is used to convert the parameter information into corresponding data information for analysis and interpretation, and transmit the interpretation result to the treatment unit.

[0069] The diagnostic unit is the host computer of the distributed acquisition unit, which is used to communicate with each distributed controller, obtain data from all measuring points and convert electrical signals (i.e. the parameter information carried) into physical quantities, and perform data analysis and fault interpretation to achieve integrated acquisition and interpretation.

[0070] like Figure 2 As shown, the diagnostic unit includes a data acquisition thread, a data classifier, a data buffer module, a data diagnostic thread, and a joint diagnostic module connected in sequence. The input end of the data acquisition thread is connected to the output end of all distributed controllers to collect parameter information, and the parameter information is converted into data information and then transmitted to the data classifier. The data classifier is used to classify the data information into engine data information and ejection data information.

[0071] The data buffer module comprises an engine data buffer and an elicitation data buffer respectively connected to the data classifier. The data classifier transmits the engine data information to the engine data buffer and transmits the elicitation data information to the elicitation data buffer respectively.

[0072] The data diagnosis thread includes an engine diagnosis thread and an ejection diagnosis thread, the input ends of which are respectively connected to the engine data buffer and the ejection data buffer, and the output ends are respectively connected to the joint fault diagnosis module, which diagnose and judge the engine data information and the ejection data information respectively, and feed back the judgment results to the joint diagnosis module. The joint diagnosis module performs joint diagnosis according to the judgment results output by the data diagnosis thread and outputs the final judgment results to the disposal unit.

[0073] The output end of the disposal unit is used to connect the actuators of the engine and the steam ejection device, and the working state of the engine and / or the steam ejection device is controlled respectively through the judgment result.

[0074] When the engine is subjected to a high-altitude simulation test, the present invention performs real-time monitoring and joint diagnosis on the working status of the engine's own system and the steam ejection device, and takes different emergency disposal measures for the engine or the steam ejection device according to the corresponding failure mode, thereby protecting the engine product and the high-altitude simulation test system in a more timely, effective and accurate manner.

[0075] The present invention jointly diagnoses the working status of the engine and the steam ejector, and can quickly and accurately stop the engine system and the steam ejector simultaneously when the steam ejector fails or the engine system fails, with a response time of less than 10ms.

[0076] This embodiment also provides a method for joint fault diagnosis of an engine and a steam ejector, comprising the following steps:

[0077] Step [1]: According to the structural composition of the engine and the steam ejector and the test requirements, determine the number and configuration of the measurement sensors, distributed collectors and distributed controllers, the configuration information includes the sampling rate, filter type, filter order, filter cutoff frequency, sensor signal type, etc., and then assemble the engine and steam ejector fault joint diagnosis system described in this embodiment.

[0078] Step [2]: According to the performance of the engine and the steam ejector, corresponding fault diagnosis rules are pre-set in the diagnosis unit, and corresponding handling rules are pre-set in the handling unit.

[0079] In order to ensure the real-time nature of diagnosis and avoid data loss caused by abnormal network data transmission and delay in emergency parking time, the diagnostic unit is based on and medium for distributed acquisition units, which are loaded with fault interpretation rules and fault mode handling rules, thereby achieving real-time acquisition and interpretation.

[0080] Due to the complex conditions at the test site, large-scale process equipment may interfere with the measurement signal, which may lead to abnormal acquisition of diagnostic parameters, resulting in false alarms and misdiagnosis. Therefore, the diagnostic unit should eliminate abnormal mutation points, judge the status of related parameters according to the position of system parameters, and eliminate data mutation points caused by factors such as sensor measurement.

[0081] For different test purposes, the ignition procedure for each test run may be different. Engine fault diagnosis needs to adapt to the working state of the engine system under different working conditions and different ignition procedures. Common engine working condition adjustment stages include start-up acceleration stage, working condition increase stage, working condition maintenance stage, working condition decrease stage, rated working condition stabilization stage, etc. When the engine is adjusted between different working conditions, its fault diagnosis parameters need to be dynamically adjusted and calculated through the floating coefficient and the previous completed working condition data.

[0082] The fault diagnosis rules of this embodiment include engine fault diagnosis rules and steam ejector fault diagnosis rules. The engine fault diagnosis rules are implemented by a three-level rule mapping structure, which includes a mapping relationship between working time period and rule relationship, a mapping relationship between rule and parameter, and a mapping relationship between parameter and dynamic range. As shown in the following table, a certain diagnostic time interval [t n_begin , t n_end ], where the diagnosis start time is t n_begin , the diagnosis end time is t n_end ; Define engine diagnosis rule R n , n∈Z+; define the engine start-up segment symbol as L, the upward adjustment segment as U, the maintaining segment as H, the downward adjustment segment as D, and the stable segment as S.

[0083] Table 1 Summary of working time period-rule relationship mapping

[0084] Diagnosis time interval Engine operating condition adjustment section rule Rule Relationship <![CDATA[t n_begin –t n_end ]]> U R1, R2 R1∪R2

[0085] In this embodiment, according to the requirements of the engine high-mode test, the fault diagnosis rules for the current test are set, as shown in Table 2.

[0086] Table 2 The mapping table of the working time period of the test-rule relationship

[0087]

[0088] In the above table, R1, R2, R3, R4, R5, Rv1, Rv2, Rv3, Rv4, etc. represent the rules corresponding to various parts of the engine.

[0089] Table 3 Rule-parameter mapping table

[0090] rule Investigation parameters Abnormality determination criteria R1 P1,P2,P3,nt Out of tolerance number ≥ 2 R2 P1,P2,P3 Out of tolerance number ≥ 2 R3 nt,P2,P4,P5 Out of tolerance number ≥ 2 R4 P2,P3,P4,P5,P6 Out of tolerance number ≥ 3 R5 P3,P4,P5,P6 Out of tolerance number ≥ 3 <![CDATA[Rv1]]> <![CDATA[Pv1,Pv2,Pv3]]> Out of tolerance number ≥ 2 <![CDATA[Rv2]]> <![CDATA[Pv1,Pv2,Pv3]]> Out of tolerance number ≥ 2 <![CDATA[Rv3]]> <![CDATA[Pv1,Pv2,Pv3]]> Out of tolerance number ≥ 2 <![CDATA[Rv4]]> <![CDATA[Pv1,Pv2,Pv3]]> Out of tolerance number ≥ 2

[0091] In the above table, P1, P2, P3, P4, P5, P6, Pv1, Pv2, and Pv3 respectively represent the corresponding pressures of various parts of the engine, and nt is the speed of a pump of the engine.

[0092] Table 4 Parameter-dynamic range mapping table

[0093]

[0094] In Table 4 above, the * in the previous mean and variance indicates that the initial value cannot be calculated.

[0095] Furthermore, the engine fault diagnosis rule will combine the three mapping tables of the mapping relationship between the working time period and the rule relationship, the mapping relationship between the rule and the parameter, and the mapping relationship between the parameter and the dynamic range into a complete rule input, as shown in Table 5.

[0096] Table 5 Engine fault diagnosis rule input

[0097]

[0098]

[0099] As for the steam ejection device, it includes a steam generator, a steam jet pump, an environmental test chamber, etc. The motive steam is generated by the steam generator, which produces steam of a certain pressure and temperature through the mixed combustion of alcohol, liquid oxygen and softened water; the steam jet pump uses motive steam as the working medium, and the steam is accelerated to a supersonic state through the nozzle to form a local vacuum, and the upstream mixed gas is pumped and ejected. The stable and reliable operation of the steam generator is particularly important for the stable and continuous supply of motive steam. Under normal supply of motive steam, the steam jet pump produces an ejection effect through the work of motive steam, thereby ensuring that the pressure at the suction port of the jet pump is within a certain range.

[0100] In summary, in order to ensure the normal operation of the steam injection device, it is necessary to monitor and diagnose the relevant important parameters of the steam generator and steam injection pump in real time, so as to judge the working performance of the steam injection system. In order to facilitate the interpretation and reduce the diagnosis time of the system, under the condition of ensuring effectiveness and authenticity, the key parameters reflecting the system performance are usually selected to enter the fault diagnosis acquisition system.

[0101] In view of the working characteristics of the steam generator and the steam jet pump, the present invention adopts a segmented and classified diagnosis method for the fault diagnosis method of the steam ejector device, that is, scientifically selecting different performance parameters for real-time monitoring and diagnosis in different working stages of the steam ejector system. If the steam generator and the steam jet pump can be divided into multiple groups, multiple groups can be monitored and diagnosed at the same time to ensure the comprehensiveness of the system diagnosis.

[0102] In this embodiment, the fault diagnosis parameters and stages of the steam generator are set as follows:

[0103] Steam generator startup phase: softened water pressure and steam temperature before spraying.

[0104] Steam generator pressure building stage: combustion chamber pressure, steam temperature, and softened water pressure before spraying.

[0105] Steam generator stable stage: combustion chamber pressure, steam temperature, softened water flow rate.

[0106] The steam generators in this embodiment are in multiple groups, so the fault diagnosis of the steam generators is carried out by separate monitoring. Control instructions can be issued separately to the control systems of the faulty steam generators in the faulty group according to the fault parameters, so as to realize the shutdown of a single group of faulty generators or the simultaneous shutdown of multiple groups of faulty generators.

[0107] Since the steam jet pump is a passive working system, the working performance parameters of the steam jet pump are monitored and diagnosed only when the water vapor is stably and continuously supplied. The fault diagnosis parameters and stages of the steam jet pump in this embodiment are set as follows:

[0108] Steam jet pump under load operation stage: jet pump suction pressure and incoming gas temperature.

[0109] Specifically, in this embodiment, the ejection fault diagnosis rules are set according to Group A, Group B, and Group C respectively, as shown in Tables 6 to 8.

[0110] Table 6 Group A steam ejection fault diagnosis rule input

[0111]

[0112] Table 7 Group B steam ejection fault diagnosis rule input

[0113]

[0114] Table 8 Group C steam ejection fault diagnosis rule input

[0115]

[0116]

[0117] Among them, Paspq1, Pbspq1, Pcspq1, Paspq2, Pbspq2, and Pcspq2 are the softened water pre-spray pressures of the corresponding groups respectively; Tafo, Tbfo, and Tcfo are the steam temperatures of the corresponding groups respectively; Par, Pbr, and Pcr are the steam pressures of the corresponding groups respectively; Pa1zi, Pb1zi, and Pc1zi are the inlet pressures of the first-stage pumps of the corresponding groups; Ta1zi, Tb1zi, and Tc1zi are the inlet temperatures of the first-stage pumps of the corresponding groups; Qas, Qbs, and Qcs are the softened water flow rates of the corresponding groups respectively.

[0118] As mentioned above, during the high-altitude simulated ignition test of the engine, both the engine system and the steam ejector must be in normal working condition, which involves the diagnosis of engine faults and steam ejector faults. Therefore, the interaction of fault information between the two systems, the classification and determination of fault modes, and the related disposal methods are particularly important. Adhering to the optimal principle of safety, importance, and economy, the safety of the engine product is guaranteed first, and the damage to the high-mode test system is minimized under the premise of product safety.

[0119] Combined with the working composition and characteristics of the engine system and the steam ejector, the following fault joint diagnosis and treatment method is established. As mentioned above, the steam ejector can be divided into multiple groups, such as A, B, C, etc. or more. The fault joint fault mode and treatment method of this embodiment (assuming that the steam ejector system is divided into three groups, namely A, B, and C, which can be determined according to actual conditions) are as follows:

[0120] Definition: Engine failure is A, normal is A*, single-group steam generator failure is B, double-group steam generator failure is C, triple-group steam generator failure is D, single-group steam jet pump failure is E, double-group steam jet pump failure is F, and triple-group steam jet pump failure is G.

[0121] In case of failure of the double steam generator or the steam ejector, the engine will execute the shutdown procedure, which is based on the premise that it is impossible to continue the test run with a single unit.

[0122] When the ratio of the number of fault groups to the total number of groups is greater than 0.5 (which can be adjusted according to the actual situation), the engine executes the shutdown procedure, otherwise, the engine continues to ignite, as shown in Table 9.

[0123] Table 9 Fault joint diagnosis mode and treatment method

[0124]

[0125]

[0126] Step [3]: Start the engine and the steam injection device, obtain corresponding parameter information through measurement sensors, and transmit it to the diagnosis unit through the corresponding distributed collector and distributed controller in sequence.

[0127] Step [4], the diagnosis unit performs diagnostic analysis and interpretation of the parameter information according to the fault diagnosis rules set in step [2], and transmits the interpretation results to the disposal unit.

[0128] 4.1. The data acquisition thread obtains the parameter information transmitted by the distributed controller, and uses the data parsing algorithm to parse the parameter information into corresponding data information and then transmits it to the data classifier.

[0129] 4.2. The data information is divided into engine data information and ignition data information by a data classifier, and transmitted to the corresponding engine data buffer and ignition data buffer respectively.

[0130] 4.3. Use the engine diagnosis thread to obtain the corresponding data information from the engine data buffer for diagnostic analysis and interpretation, and feed back the interpretation results to the joint diagnosis module. Figure 3 , this step is specifically as follows:

[0131] 4.3.1. The engine diagnosis thread is used to cyclically obtain the corresponding data information from the engine data buffer, and the working time t of the engine ignition program is calculated according to the current data accumulation number in the data information, t = i / sample_rate.

[0132] 4.3.2. Based on the working time calculated in step 4.3.1, obtain the diagnostic time interval [t1, t2] corresponding to the working time.

[0133] 4.3.3. According to the mapping relationship between working time period and rule relationship, obtain the rules, rule relationships and the working section of the engine currently in which the diagnostic time interval described in step 4.3.2 corresponds to. Here, it should be noted that the actual rules obtained may be one or more. Assuming that the current working time t∈[t1,t2], the corresponding rules are R2 and Rv1, the rule relationship is R2∪Rv1, and the working section is the upward adjustment section. The corresponding rules of R2 and Rv1 are shown in Table 3.

[0134] 4.3.4. Take one of the rules R2 and obtain the inspection parameters P1, P2, and P3 corresponding to the rule based on the mapping relationship between rules and parameters.

[0135] 4.3.5. According to the mapping relationship between parameter and dynamic range, the parameter range of the inspection parameters P1, P2 and P3 is obtained, where the upper limit range is calculated by the mean and variance of the parameters in the previous working section, and the lower limit is a fixed value, see Table 4.

[0136] 4.3.6. Based on steps 4.3.4 and 4.3.5, determine whether the rule is abnormal based on the rule-parameter mapping relationship. If more than or equal to 2 parameters P1, P2, and P3 are out of limit, it is an abnormality, rule R2 is recorded as true, and step 4.3.8 is executed; if it is not an abnormality, return to step 4.3.1.

[0137] 4.3.7. Follow the methods of steps 4.3.4 to 4.3.6 to determine whether rule Rv1 is abnormal, and proceed to step 4.3.8.

[0138] 4.3.8. Based on the abnormal judgment results of steps 4.3.6 and 4.3.7, determine whether a fault has occurred according to the mapping relationship between the working time period and the rule relationship, that is, calculate R2∪Rv1. If R2 is true or Rv1 is true or both Rv1 and R2 are true, it is determined that a fault has occurred. Combined with the current working section of the engine, the judgment result is fed back to the joint diagnosis module; if R2 and Rv1 are both false, it is determined that a fault has occurred, and then return to step 4.3.1.

[0139] 4.4. Use the induced diagnosis thread to obtain the corresponding data information from the induced data buffer for diagnostic analysis and interpretation, and feed the interpretation results back to the joint diagnosis module. Figure 4 , this step is specifically as follows:

[0140] 4.4.1. Use the ejection diagnostic thread to cyclically obtain the corresponding data information from the ejection data buffer, and calculate the working time t of the steam generator ignition program in the steam ejection device according to the current data accumulation number in the data information, t = i / sample_rate.

[0141] 4.4.2. Based on the working time described in step 4.4.1, obtain the working time intervals corresponding to the steam ejection device groups A, B and C under the working time.

[0142] 4.4.3. According to the fault diagnosis rules of steam ejector, the current working sections and related parameters of groups A, B and C are obtained. Assuming that the current time t a ∈[t3a,∞],t b ∈[t3b,∞],t c ∈[t3c,∞], that is, the steam generators in groups A, B, and C are all in the stable section.

[0143] Then determine whether it is abnormal and the type of abnormality. If more than or equal to 2 parameters of Qas, Tafo, and Par are out of limit, or if more than or equal to 1 parameter of Pa1zi and Ta1zi is out of limit, send an emergency stop signal of the generator of group A to the joint diagnosis module; otherwise, return to step 4.4.1.

[0144] Then, according to the above method, determine whether Group B and Group C send emergency stop signals.

[0145] 4.5. The joint diagnosis module makes a comprehensive judgment on the judgment results transmitted in step 4.3.8 and step 4.4.3, and transmits the final judgment result to the disposal unit.

[0146] Step [5], the handling unit controls the working state of the engine and / or the steam ejector device accordingly based on the judgment result of step [4] and the handling rules set in step [2], thereby completing the joint diagnosis of the engine and steam ejector device faults.

[0147] Combination Figure 5 As shown in Table 9, the diagnosis and treatment of the combined fault diagnosis module and the treatment unit are as follows:

[0148] 1) When the joint diagnosis module receives the engine emergency stop signal, the engine emergency stop treatment is directly performed through the treatment unit.

[0149] 2) When the joint diagnosis module receives an emergency stop signal from Group A, Group B or Group C, it determines whether the working time of the steam generator ignition program is within k seconds (i.e., the pre-set or required time). If it is within the k-second interval, the handling unit will perform emergency stop handling on the steam generators of Group A, Group B and Group C.

[0150] 3) If the program time is greater than k seconds, the emergency stop flag is set corresponding to the emergency stop signal group.

[0151] 4) Polling flags: When the number of emergency stop flags is greater than or equal to 2, the engine is emergency stopped, and at the same time, the corresponding group of steam generators are emergency stopped through the handling unit.

[0152] 5) When the number of emergency stop flags is equal to 1, the engine does not perform emergency stop, and only the corresponding group of steam generators is emergency stopped through the handling unit.

[0153] 6) The steam generator group that has not received the emergency stop signal shall continue to pump for ≮100s, and the stop time shall be determined by the commander.

[0154] When the steam injection device fails and the engine is normal, the present invention stops one, two or more groups of water steam generators and steam injection pumps in groups by judging the failure mode, and stops the engine according to the change of upstream vacuum degree, thereby minimizing the change gradient of vacuum pressure and reducing the damage of downstream back pressure to the engine.

[0155] The present invention performs online monitoring and joint diagnosis on the engine system. When the engine system fails and the steam injection is normal, the engine is shut down in time by judging the failure mode, and the steam injection system continues to work to ensure the vacuum degree upstream, that is, the vacuum degree of the environmental test chamber, thereby ensuring the safety of the engine product and the steam injection system.

[0156] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present invention.

Claims

1. A combined fault diagnosis system for an engine and a steam ejector, characterized in that: It includes distributed acquisition units, diagnosis units and treatment units; The distributed acquisition unit includes a plurality of measurement sensors, a plurality of distributed collectors and a plurality of distributed controllers; The input ends of the plurality of measuring sensors are respectively used to connect to the engine and the steam ejector device and measure the corresponding parameter information; The input end of each of the distributed collectors is respectively connected to the output end of one or more measurement sensors, so as to supply power to the corresponding measurement sensors and collect parameter information measured by the sensors; The input end of each of the distributed controllers is respectively connected to the output end of one or more distributed collectors, and the output end is connected to the input end of the diagnostic unit, so as to pre-process the parameter information and transmit it to the diagnostic unit; The output end of the diagnosis unit is connected to the input end of the treatment unit, and is used to convert the parameter information into corresponding data information for analysis and interpretation, and transmit the interpretation result to the treatment unit; The output end of the disposal unit is used to connect the actuators of the engine and the steam ejection device, and to control the working state of the engine and / or the steam ejection device through the judgment result.

2. The engine and steam ejector fault combined diagnosis system according to claim 1, characterized in that: The diagnostic unit includes a data acquisition thread, a data classifier, a data buffer module, a data diagnostic thread, and a joint diagnostic module connected in sequence; The input end of the data acquisition thread is connected to the output ends of all distributed controllers, and is used to collect parameter information, and convert the parameter information into data information and transmit it to the data classifier; The data classifier is used to classify the data information into engine data information and ejection data information; The data buffer module includes an engine data buffer and an elicitation data buffer respectively connected to the data classifier, and the data classifier transmits the engine data information to the engine data buffer and transmits the elicitation data information to the elicitation data buffer respectively; The data diagnosis thread includes an engine diagnosis thread and an induced emission diagnosis thread, the input ends of which are respectively connected to the engine data buffer and the induced emission data buffer, and the output ends are respectively connected to the joint fault diagnosis module, and are respectively used to diagnose and judge the engine data information and the induced emission data information, and feed back the judgment results to the joint diagnosis module; The joint diagnosis module is used to perform joint diagnosis according to the determination result output by the data diagnosis thread and output the final determination result.

3. The engine and steam ejector fault combined diagnosis system according to claim 1 or 2, characterized in that: The measuring sensor is a dual redundant output measuring sensor.

4. A method for joint fault diagnosis of an engine and a steam ejector, characterized in that: The following steps are involved: Step [1], according to the structural composition and test requirements of the engine and the steam ejector, determine the number and configuration of the measuring sensors, the distributed collectors and the distributed controllers, and assemble the engine and steam ejector fault joint diagnosis system according to any one of claims 1 to 3; Step [2], according to the performance of the engine and the steam ejector, setting corresponding fault diagnosis rules in the diagnosis unit in advance, and setting corresponding handling rules in the handling unit; Step [3], starting the engine and the steam ejector, obtaining corresponding parameter information through the measuring sensor, and transmitting the information to the diagnosis unit through the corresponding distributed collector and distributed controller in sequence; Step [4], the diagnosis unit performs diagnosis analysis and interpretation of the parameter information according to the fault diagnosis rules set in step [2], and transmits the interpretation result to the disposal unit; Step [5], the handling unit controls the working state of the engine and / or the steam ejector device accordingly based on the judgment result of step [4] and the handling rules set in step [2], thereby completing the joint diagnosis of the engine and steam ejector device faults.

5. The combined fault diagnosis method for the engine and the steam ejector according to claim 4, characterized in that: In step [2], the fault diagnosis rules include engine fault diagnosis rules and steam ejector fault diagnosis rules; The engine fault diagnosis rules are implemented by a three-level rule mapping structure, which includes a mapping relationship between working time period and rule relationship, a mapping relationship between rule and parameter, and a mapping relationship between parameter and dynamic range; The fault diagnosis rules of the steam ejector device are implemented in a classified and segmented manner. The classification and segmentation refer to dividing the water steam generator and steam jet pump in the steam ejector device into different working stages, wherein the working stage of the water steam generator includes the startup stage, the pressure building stage, and the stable stage; the working stage of the steam jet pump refers to the load operation stage.

6. The combined fault diagnosis method for the engine and the steam ejector according to claim 5, characterized in that: Step [4] is as follows: 4.

1. The data acquisition thread obtains the parameter information transmitted by the distributed controller, and uses the data parsing algorithm to parse the parameter information into corresponding data information and then transmits it to the data classifier; 4.

2. The data information is divided into engine data information and ignition data information by a data classifier, and transmitted to the corresponding engine data buffer and ignition data buffer respectively; 4.

3. Use the engine diagnosis thread to obtain the corresponding data information from the engine data buffer for diagnostic analysis and interpretation, and feed back the interpretation results to the joint diagnosis module; 4.

4. Use the induced diagnosis thread to obtain the corresponding data information from the induced data buffer for diagnostic analysis and interpretation, and feed back the interpretation results to the joint diagnosis module; 4.

5. The joint diagnosis module makes a comprehensive judgment on the judgment results transmitted in step 4.3 and step 4.4, and transmits the final judgment result to the disposal unit.

7. The combined fault diagnosis method for an engine and a steam ejector according to claim 6, characterized in that: Step 4.3 is as follows: 4.3.

1. Use the engine diagnosis thread to cyclically obtain the corresponding data information from the engine data buffer, and calculate the working time of the engine ignition program according to the current data accumulation number in the data information; 4.3.

2. Based on the working time described in step 4.3.1, obtain the diagnostic time interval corresponding to the working time; 4.3.

3. According to the mapping relationship between the working time period and the rule relationship, obtain the rules, rule relationships and the current working period of the engine corresponding to the diagnostic time interval described in step 4.3.2; the rules may be one or more; 4.3.

4. Take any rule and obtain the inspection parameters corresponding to the rule according to the mapping relationship between rule and parameter; the inspection parameters may be one or more; 4.3.

5. According to the mapping relationship between parameter and dynamic range, obtain the parameter range of each inspection parameter corresponding to the rule; 4.3.

6. Based on steps 4.3.4 and 4.3.5, determine whether the rule is abnormal according to the mapping relationship between rules and parameters. If so, record it as true and execute step 4.3.8; otherwise, return to step 4.3.1; 4.3.

7. Follow the methods of steps 4.3.4 to 4.3.6 to determine whether all other rules are abnormal, and proceed to step 4.3.8; 4.3.

8. Based on the abnormality determination results of steps 4.3.6 and 4.3.7, determine whether a fault has occurred according to the mapping relationship between the working time period and the rule relationship. If so, the determination result is fed back to the joint diagnosis module in combination with the current working section of the engine described in step 4.3.3; otherwise, return to step 4.3.

1.

8. The combined fault diagnosis method for an engine and a steam ejector according to claim 7, characterized in that: Step 4.4 is as follows: 4.4.

1. Use the ejection diagnostic thread to cyclically obtain the corresponding data information from the ejection data buffer, and calculate the working time of the steam generator ignition program in the steam ejection device according to the current data accumulation number in the data information; 4.4.

2. Based on the working time described in step 4.4.1, obtain the working time interval corresponding to each component of the steam ejector device under the working time; 4.4.

3. According to the fault diagnosis rules of the steam ejector device, the current working section of each component of the steam ejector device and its associated parameters are obtained, and whether it is abnormal and the type of abnormality are determined. If there is an abnormality, the determination result is fed back to the joint diagnosis module; otherwise, return to step 4.4.

1.

9. The combined fault diagnosis method for an engine and a steam ejector according to claim 8, characterized in that: Step 4.5 is specifically, when the joint diagnosis module receives the determination result of step 4.3.8 that the engine needs emergency shutdown, the determination result is directly transmitted to the disposal unit; When the joint diagnosis module receives the judgment result of step 4.3.8 that the engine is normal, it further judges in combination with the judgment result of step 4.4.3 and transmits the final judgment result to the disposal unit.

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