A system and method for combined diagnosis of engine and steam ejector faults

Abstract

The application discloses a fault joint diagnosis system and method of an engine and a steam ejector device, and is used for solving the technical problem that the prior art cannot diagnose the engine fault caused by the destruction of the external simulation environment. The diagnosis system comprises 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. The input end of each distributed collector is connected with the output end of one or more measurement sensors respectively, each distributed controller is connected with the output end of one or more distributed collectors and the diagnosis unit respectively, the diagnosis unit is connected with the disposal unit, is used for analyzing and interpreting the parameter information, and feeds back the interpretation result to the disposal unit, and the disposal unit controls the working state of the engine and / or the steam ejector device through the interpretation result respectively.

Description

TECHNICAL FIELD

[0001] The present application relates to a liquid rocket engine high-altitude simulation test method, in particular to a fault joint diagnosis system and method of an engine and a steam ejector device. BACKGROUND

[0002] For a lunar probe, a Mars probe, a manned lunar landing probe, or a spacecraft, the engine of the power system needs to be subjected to a high-altitude environment (i.e., a vacuum environment) simulation ignition test to verify the working performance and state of the engine in the vacuum environment. The high-altitude environment is quite different from the ground environment, such as air pressure, temperature, humidity, and the like, which will affect the working of the rocket engine. The engine participating in the high-altitude simulation test can evaluate the performance parameters of the rocket engine in the high-altitude environment, such as thrust, specific impulse, and combustion stability, to simulate the working state and working reliability of the rocket engine in actual flight.

[0003] The high-altitude simulation test usually uses a steam ejector system to create a vacuum environment for the engine. The steam ejector system includes a water vapor generator, a steam ejector pump, and an environmental test chamber. The water vapor generator mainly generates power steam with a certain pressure and temperature. According to the order of magnitude of the steam flow, the water vapor generator is usually set in a multiple-parallel working mode to ensure the supply of steam flow. As the core component of the steam ejector system, the stable and reliable combustion of the water vapor generator plays a very important role in the stable supply of power steam. The steam ejector pump mainly uses power steam as the working medium, accelerates the power steam to a supersonic state through a nozzle, forms a certain vacuum degree, and then sucks and mixes the upstream airflow, discharges to the atmosphere through pressure boosting and speed reduction, and thus ensures the vacuum degree of the upstream, i.e., the vacuum degree when the engine ignites. Like the water vapor generator, the steam ejector pump can also be set in a multiple-parallel mode. The environmental test chamber mainly provides an ignition environment and space for the engine.

[0004] At present, in the process of high-altitude simulation test of engine, fault diagnosis of engine system is generally needed, and the fault diagnosis plays a crucial role in the reliability, safety and performance optimization of engine, which can implement emergency shutdown before the fault occurs through real-time monitoring of the operating parameters and state of engine, so as to avoid serious damage; meanwhile, various data can be recorded in the process of engine test, and the fault events are recorded, which can provide strong support for subsequent analysis of fault mode and reason, and improve engine design and manufacturing process. However, the existing fault diagnosis is usually only for parameter diagnosis of engine system, and in the high-altitude simulation test, the external steam ejector system is also very important in addition to the engine system itself. If the steam ejector system fails during engine ignition and the suction capacity is insufficient, the high-temperature gas generated by the engine cannot be discharged in time, which will cause the cabin pressure to be unstable, the engine gas to flow back and even the engine nozzle to be damaged. Especially for deep space exploration high-thrust engine, 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, so the nozzle cannot meet the strength requirement caused by instantaneous back pressure. If the steam generator suddenly fails, the structure of the tested engine will be damaged. For the instantaneous damage of engine caused by the destruction of the external simulation environment, only the fault diagnosis of the engine itself cannot guarantee the safety of the product, and the joint disposal needs to be carried out in time when the external environment changes. SUMMARY

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

[0006] To achieve the above-mentioned purpose, the technical solution provided by the present application is:

[0007] A fault joint diagnosis system of engine and steam ejector device, characterized in that it comprises a distributed acquisition unit, a diagnosis unit and a disposal unit;

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

[0009] The input ends of the plurality of measurement sensors are respectively connected to the engine and the steam ejector device, and measure the corresponding parameter information;

[0010] The input end of each distributed collector is connected to the output end of one or more measurement sensors, for supplying power to the corresponding measurement sensor and collecting the measured parameter information;

[0011] The input end of each of the distributed controllers is connected to the output end of one or more distributed collectors, and the output end is connected to the input end of the diagnosis unit, for pre-processing and transmitting the parameter information to the diagnosis unit;

[0012] The output end of the diagnosis unit is connected to the input end of the treatment unit, for converting the parameter information into corresponding data information, analyzing and interpreting, and feeding back the interpretation result to the treatment unit;

[0013] The output end of the treatment unit is used to connect the actuators of the engine and the steam ejector device, and the working state of the engine and / or the steam ejector device is controlled through the interpretation result.

[0014] Further, the diagnosis unit comprises 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 end of all distributed controllers, for acquiring parameter information and converting the parameter information into data information and transmitting the data information to the data classifier;

[0016] The data classifier is used to divide the data information into engine data information and ejector data information;

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

[0018] The data diagnosis thread comprises an engine diagnosis thread and an ejector diagnosis thread, the input ends of the two are connected to the engine data buffer area and the ejector data buffer area respectively, the output ends are connected to the joint fault diagnosis module respectively, and the engine data information and the ejector data information are diagnosed and determined respectively, and the determination result is fed back 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] Further, the measurement sensor is a double-redundant output measurement sensor.

[0021] The present application also provides an engine and steam ejector device fault joint diagnosis method, comprising the following steps:

[0022] Step 【1】. According to the structure of the engine and the steam ejector device and the test requirements, the number and configuration of the measurement sensors, the distributed collectors and the distributed controllers are determined and the fault joint diagnosis system of the engine and the steam ejector device is assembled;

[0023] Step 【2】. According to the performance of the engine and the steam ejector device, the corresponding fault diagnosis rules are set in the diagnosis unit in advance and the corresponding treatment rules are set in the treatment unit;

[0024] Step 【3】. The engine and the steam ejector device are started, the corresponding parameter information is measured and obtained by the measurement sensors, and is transmitted to the diagnosis unit in turn through the corresponding distributed collectors and distributed controllers;

[0025] Step 【4】. The diagnosis unit diagnoses and interprets the parameter information according to the fault diagnosis rules set in step 【2】 and transmits the interpretation results to the treatment unit;

[0026] Step 【5】. The treatment unit controls the working state of the engine and / or the steam ejector device according to the interpretation results of step 【4】 and the treatment rules set in step 【2】 to complete the fault joint diagnosis of the engine and the steam ejector device.

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

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

[0029] The steam ejector device fault diagnosis rules are realized by classification and segmentation, which means that the water vapor generator and the steam jet pump in the steam ejector device are divided according to different working stages, wherein the working stages of the water vapor generator include the starting stage, the pressure building stage and the stable stage; the working stage of the steam jet pump is the load running stage.

[0030] Further, step 【4】 is specifically:

[0031] 4.1. The data acquisition thread obtains the parameter information transmitted by the distributed controller, and transmits the parameter information to the data classifier after the parameter information is parsed into corresponding data information by using a data parsing algorithm;

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

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

[0034] 4.4, adopt injection diagnosis thread to obtain corresponding data information from injection data buffer for diagnosis analysis and interpretation, and feed back the interpretation result to the joint diagnosis module;

[0035] 4.5, the joint diagnosis module comprehensively determines the determination results transmitted by steps 4.3 and 4.4, and transmits the final determination result to the disposal unit.

[0036] Further, step 4.3 is specifically:

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

[0038] 4.3.2, according to the working time in step 4.3.1, obtain the diagnosis time interval corresponding to the working time;

[0039] 4.3.3, according to the mapping relationship of working time period-rule relationship, obtain the rule corresponding to the diagnosis time interval in step 4.3.2, rule relationship and the working section of the engine at present; The rule is one or more;

[0040] 4.3.4, taking any rule, according to the mapping relationship of rule-parameter, respectively obtaining the investigation parameter corresponding to the rule; The investigation parameter is one or more;

[0041] 4.3.5, according to the mapping relationship of parameter-dynamic range, obtain the parameter range of each investigation parameter corresponding to the rule;

[0042] 4.3.6, on the basis of steps 4.3.4 and 4.3.5, according to the mapping relationship of rule-parameter, determine whether the rule is abnormal, if yes, mark it as true, and execute step 4.3.8; Otherwise, return to step 4.3.1;

[0043] 4.3.7, according to the method of steps 4.3.4 to 4.3.6, complete the determination of whether all other rules are abnormal, and execute step 4.3.8;

[0044] 4.3.8, based on the abnormality determination result of steps 4.3.6 and 4.3.7, determining whether the fault occurs according to the mapping relationship of the working time period-rule relationship, if yes, combining the working section of the engine currently located according to the description of step 4.3.3, feeding back the determination result to the joint diagnosis module, otherwise, returning to step 4.3.1.

[0045] Further, step 4.4 is specifically:

[0046] 4.4.1, the corresponding data information is obtained from the ejection data buffer by using the ejection diagnosis thread, and the working time of the steam generator ignition program in the steam ejection device is calculated according to the current data accumulation in the data information;

[0047] 4.4.2, based on the working time described in step 4.4.1, the working time interval corresponding to each component of the steam ejection device under the working time is obtained;

[0048] 4.4.3, according to the steam ejection device fault diagnosis rule, the working section and its associated parameters of each component of the steam ejection device are obtained, and whether it is abnormal and the type of abnormality is 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] Further, step 4.5 is specifically: when the joint diagnosis module receives the determination result of step 4.3.8 as the engine emergency stop signal, the determination result is directly transmitted to the disposal unit; when the joint diagnosis module receives the determination result of step 4.3.8 as the engine normal, the determination result of step 4.4.3 is further determined, and the final determination result is transmitted to the disposal unit.

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

[0051] 1, the engine and steam ejection device fault joint diagnosis system of the present application, including distributed acquisition unit, diagnosis unit and disposal unit, wherein the distributed acquisition unit includes a plurality of measurement sensors, a plurality of distributed collectors and a plurality of distributed controllers, a set of diagnosis system can be used to simultaneously monitor and diagnose the parameters of the engine and the steam ejection device, respectively, reducing the time difference and error rate of information interaction between the engine system and the steam ejection device, improving the accuracy and timeliness of data acquisition, thereby realizing the precision of engine fault diagnosis.

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

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

[0054] 4. The joint fault diagnosis method for the engine and steam ejector of the present invention can analyze and diagnose engine data information through the engine diagnosis thread and ejector data information through the ejector diagnosis thread, and then output the final judgment result by the joint diagnosis module. Finally, the processing unit performs real-time processing to achieve joint diagnosis of the engine and 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 ejector of the present invention can perform online monitoring and combined diagnosis of multiple steam ejector devices, minimize the change gradient of vacuum pressure, and thus reduce the damage of downstream back pressure to the engine.

[0056] 6. The combined fault diagnosis method of the engine and steam ejector of the present invention provides a combined diagnosis of the working status of the engine and steam ejector. In the event of a fault in the steam ejector or the engine system, it can quickly and accurately shut down the engine system and the steam ejector simultaneously with a short response time. Attached Figure Description

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

[0058] Figure 2 This is a schematic diagram of the structure of the diagnostic unit and the treatment unit in an embodiment of a fault joint diagnostic system for an engine and a steam ejector device according to the present invention.

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

[0060] Figure 4 This is a flowchart illustrating the fault diagnosis process of the steam ejector device in an embodiment of the combined fault diagnosis method for an engine and a steam ejector device according to the present invention.

[0061] Figure 5 This is a flowchart illustrating the workflow of the joint diagnosis module in an embodiment of the joint diagnosis method for engine and steam ejector device according to the present invention. Detailed Implementation

[0062] In order to make the purposes, advantages and features of the present application clearer, the following further describes the present application in conjunction with the drawings and specific embodiments. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application.

[0063] As shown in Figure 1 The present embodiment provides a fault joint diagnosis system of an engine and a steam ejector device, which comprises 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 device is different from the rocket engine, and has a large system, a complex composition and a scattered distribution of key parameter measurement point positions. In order to realize joint monitoring of important parameters of the engine system and the steam ejector device, the present application uses the distributed acquisition unit to reduce cable switching and improve the robustness of the system.

[0065] The input ends of the plurality of measurement sensors are connected to the engine and the steam ejector device, and measure corresponding parameter information such as pressure, temperature and flow rate. The input end of each distributed collector is connected to the output end of one or more measurement sensors, for supplying power to the corresponding measurement sensor and collecting the measured parameter information.

[0066] In order to ensure the accuracy and reliability of the acquisition of fault diagnosis parameters in high-altitude simulation tests, the present embodiment uses the distributed collector independent of the engine measurement system to collect the corresponding fault diagnosis parameters, and uses double-redundant output measurement sensors for the measurement sensors of the corresponding measurement points. The distributed collector is set close to the measurement point positions, which can improve the accuracy and reliability of 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 diagnosis unit, for transmitting the parameter information to the diagnosis unit after pre-processing. The distributed controller is used to receive the electrical signals collected by the distributed collector, and to process and analyze the data, and to perform filtering, calibration, conversion and other operations on the data, so as to ensure the accuracy and reliability of the data. The distributed controller coordinates and manages the entire distributed acquisition unit, controls the working mode, sampling frequency, data transmission and the like 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 disposal unit, for converting the parameter information into corresponding data information, analyzing and interpreting the data information, and transmitting the interpretation results to the disposal unit.

[0069] The diagnostic unit is an upper computer of the distributed acquisition unit, used for communicating with each distributed controller, acquiring data of all measuring points, converting electric signals (i.e. parameter information carried) into physical quantities, and performing data analysis and fault judgment, so as to realize integration of acquisition and judgment.

[0070] As shown in Figure 2 The diagnostic unit comprises a data acquisition thread, a data classifier, a data buffer module, a data diagnosis thread and a joint diagnosis module connected in sequence. The input end of the data acquisition thread is connected with the output end of all distributed controllers, used for acquiring parameter information and converting the parameter information into data information and then transmitting to the data classifier. The data classifier is used for dividing the data information into engine data information and injection data information.

[0071] The data buffer module comprises an engine data buffer area and an injection data buffer area connected with the data classifier respectively, and the data classifier transmits the engine data information to the engine data buffer area and transmits the injection data information to the injection data buffer area respectively.

[0072] The data diagnosis thread comprises an engine diagnosis thread and an injection diagnosis thread, the input ends of which are connected with the engine data buffer area and the injection data buffer area respectively, and the output ends of which are connected with the joint fault diagnosis module respectively, used for diagnosing and judging the engine data information and the injection data information respectively and feeding 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 for connecting the actuators of the engine and the steam injection device, and controlling the working states of the engine and / or the steam injection device according to the judgment results.

[0074] The present application can more timely, effectively and accurately protect the engine product and the high-altitude simulation test system by real-time monitoring and joint diagnosis of the working states of the engine system and the steam injection device and taking different emergency disposal measures on the engine or the steam injection device according to the corresponding fault mode when the engine performs high-altitude simulation test.

[0075] The present application can quickly and accurately stop the engine system and the steam injection device at the same time when the steam injection device fails or the engine system fails, and the response time is within 10 ms.

[0076] The present application also provides a fault joint diagnosis method of an engine and a steam injection device, comprising the following steps:

[0077] Step 【1】. According to the structure of the engine and the steam ejector device and the test requirements, the number and configuration of the measurement sensors, the distributed collector and the distributed controller are determined, including the sampling rate, the filter type, the filter order, the filter cutoff frequency, the sensor signal type, etc. Then the fault joint diagnosis system of the engine and the steam ejector device is assembled.

[0078] Step 【2】. According to the performance of the engine and the steam ejector device, the corresponding fault diagnosis rules are set in the diagnosis unit in advance, and the corresponding treatment rules are set in the treatment unit.

[0079] In order to ensure the real-time of diagnosis and avoid the delay of emergency shutdown caused by data loss due to abnormal network data transmission, the diagnosis unit is based on and medium of the distributed collection unit, which loads fault interpretation rules and fault mode treatment rules, so as to realize real-time collection and interpretation.

[0080] Due to the complex test site, the interference of large process equipment on the measurement signal may cause abnormal acquisition of diagnostic parameters, and further cause false alarm misdiagnosis. Therefore, the diagnosis unit should eliminate abnormal mutation points, judge the state of related parameters according to the position of system parameters, and eliminate data anomaly points caused by sensor measurement and other factors.

[0081] For different test purposes, the ignition program may be different each time. The engine fault diagnosis needs to adapt to the working state of the engine system under different working conditions and different ignition programs. Common engine working condition adjustment stages include start-up acceleration section, working condition up-regulation section, working condition maintenance section, working condition down-regulation section, rated working condition stable section, etc. When the engine adjusts between different working conditions, the fault diagnosis parameters need to be dynamically adjusted and calculated through the floating coefficient and the data of the previous completed working condition.

[0082] The fault diagnosis rules of the embodiment include engine fault diagnosis rules and steam ejector device fault diagnosis rules. Among them, the engine fault diagnosis rules are realized through a three-level rule mapping structure, which includes the mapping relationship of the working time period-rule relationship, the mapping relationship of the rule-parameter, and the mapping relationship of the parameter-dynamic range, as shown in the following table, defining a certain diagnosis time interval [t n_begin , t n_end ], wherein the diagnosis start time is t n_begin , and the diagnosis end time is t n_end ; define the engine diagnosis rule R n , n∈Z+; define the engine working start-up segment symbol as L, the up-regulation segment as U, the maintenance segment as H, the down-regulation segment as D, and the stable segment as S.

[0083] Table 1 Working Time Period-Rule Relationship Mapping Table

[0084] Diagnosis time interval Engine operating condition adjustment section Rule Rule relationship t n_begin –t n_end ]]> U R1, R2 R1 U R2

[0085] The embodiment sets the next test fault diagnosis rule according to the engine high mode test requirement, and the rule is shown in Table 2.

[0086] Table 2: Working time period-rule relationship mapping table

[0087]

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

[0089] Table 3: Rule-parameter mapping table

[0090] Rule Investigation parameter Abnormality determination criterion R1 P1, P2, P3, nt Number of excesses ≥ 2 R2 P1, P2, P3 Number of excesses ≥ 2 R3 nt, P2, P4, P5 Number of excesses ≥ 2 R4 P2, P3, P4, P5, P6 Number of excesses ≥ 3 R5 P3, P4, P5, P6 Number of excesses ≥ 3 [Rv1] [Pv1, Pv2, Pv3] Number of excesses ≥ 2 [Rv2] [Pv1, Pv2, Pv3] Number of excesses ≥ 2 [Rv3] [Pv1, Pv2, Pv3] Number of excesses ≥ 2 [Rv4] [Pv1, Pv2, Pv3] Number of excesses ≥ 2

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

[0092] Table 4: Parameter-dynamic range mapping table

[0093]

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

[0095] Further, the engine fault diagnosis rule combines the mapping relationship of the working time period-rule relationship, the mapping relationship of the rule-parameter, and the mapping relationship of the parameter-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 ejector device, it includes a water vapor generator, a steam ejector pump, an environmental test chamber, etc. The power steam is generated by the water vapor generator, which generates water vapor with a certain pressure and temperature through the mixed combustion of alcohol, liquid oxygen and softened water; the steam ejector pump uses power steam as the working medium, and the water vapor is accelerated to supersonic speed through the nozzle to form a local vacuum to suck and inject the upstream mixed gas. The stable and reliable operation of the water vapor generator is particularly important for the stable and continuous supply of power steam. Under the normal supply of power steam, the steam ejector pump generates the injection effect through the power steam to ensure that the suction inlet pressure of the ejector pump is within a certain range.

[0100] In summary, in order to ensure the normal operation of the steam ejector device, the related important parameters of the water vapor generator and the steam ejector pump need to be monitored and diagnosed in real time, so as to judge the working performance of the steam ejector system. In order to facilitate interpretation and reduce the diagnosis time of the system, the key parameters reflecting the performance of the system are usually selected into the fault diagnosis collection system under the condition of ensuring the effectiveness and authenticity.

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

[0102] The fault diagnosis parameters and stages of the water vapor generator in this embodiment are as follows:

[0103] The water vapor generator startup stage: softened water pre-injection pressure, steam temperature.

[0104] The water vapor generator pressure building stage: combustion chamber pressure, steam temperature, softened water pre-injection pressure.

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

[0106] The water vapor generator in this embodiment is multiple groups, so the fault diagnosis of the water vapor generator adopts a separate monitoring mode. Control instructions can be sent to the control system of the fault group water vapor generator according to the fault parameters, so as to realize the shutdown of the single group generator with fault or the simultaneous shutdown of multiple group generators with fault.

[0107] Since the steam ejector pump is a passive working system, the working performance parameters of the steam ejector pump are monitored and diagnosed only under the condition of continuous supply of water vapor. The fault diagnosis parameters and stages of the steam ejector pump in this embodiment are as follows:

[0108] The steam ejector pump load running stage: ejector pump suction inlet pressure, incoming gas temperature.

[0109] Specifically, the steam ejector fault diagnosis rules are set for group A, group B and group C respectively, as shown in Tables 6-8.

[0110] Table 6 A group of steam ejector fault diagnosis rule input

[0111]

[0112] Table 7 B group of steam ejector fault diagnosis rule input

[0113]

[0114] Table 8C Group Steam Ejection Fault Diagnosis Rule Input

[0115]

[0116]

[0117] Wherein, Paspq1, Pbspq1, Pcspq1, Paspq2, Pbspq2, Pcspq2 are the softened water pre-injection pressure of the corresponding group respectively; Tafo, Tbfo, Tcfo are the steam temperature of the corresponding group respectively; Par, Pbr, Pcr are the steam pressure of the corresponding group respectively; Pa1zi, Pb1zi, Pc1zi are the first stage pump inlet pressure of the corresponding group respectively; Ta1zi, Tb1zi, Tc1zi are the first stage pump inlet temperature of the corresponding group respectively; Qas, Qbs, Qcs are the softened water flow of the corresponding group respectively.

[0118] As described above, during the engine high altitude simulation ignition test, the engine system and the steam ejection device need to ensure normal working state, which involves the diagnosis of engine failure and the diagnosis of steam ejection device failure, therefore, the fault information interaction of the two systems, the classification determination of the fault mode and the related disposal method are particularly important. In line with the principle of joint optimization of safety, importance and economy, first of all, the safety of the engine product is ensured, and under the premise of product safety, the damage of the high altitude simulation test system is minimized.

[0119] Combined with the working composition and characteristics of the engine system and the steam ejection device, the following fault joint diagnosis and disposal method is established, as described above, the steam ejection device can be divided into multiple groups, such as A, B, C groups or more, the fault joint fault mode and disposal method of the embodiment (assuming that the steam ejection system is divided into three groups, namely A, B, C groups, which can be determined according to the actual situation) is as follows:

[0120] Definition: engine failure is A, normal is A*, single group water steam generator failure is B, double group water steam generator failure is C, three group water steam generator failure is D, single group steam ejection pump failure is E, double group steam ejection pump failure is F, three group steam ejection pump failure is G.

[0121] Double group water steam generator failure or steam ejection device failure, engine executes parking procedure, which is based on the premise that single group cannot continue to test.

[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 actual conditions), the engine performs a parking procedure, otherwise the engine continues to fire, as shown in Table 9.

[0123] Table 9 Fault Joint Diagnosis Mode and Disposal Method

[0124]

[0125]

[0126] Step 【3】, start the engine and the steam ejector device, measure the corresponding parameter information through the measuring sensor, and transmit it to the diagnosis unit through the corresponding distributed collector and distributed controller in turn.

[0127] Step 【4】, the diagnosis unit diagnoses and interprets the parameter information according to the fault diagnosis rules set in step 【2】, and transmits the interpretation result to the disposal unit.

[0128] 4.1, the data acquisition thread obtains the parameter information transmitted by the distributed controller, and transmits it to the data classifier after parsing the parameter information into corresponding data information using a data parsing algorithm.

[0129] 4.2, the data classifier divides the data information into engine data information and ejector data information, and transmits them to the corresponding engine data buffer and ejector data buffer respectively.

[0130] 4.3, the engine diagnosis thread obtains the corresponding data information from the engine data buffer for diagnosis and interpretation, and feeds back the interpretation result to the joint diagnosis module. Combined with Figure 3 , this step is specifically:

[0131] 4.3.1, the engine diagnosis thread obtains the corresponding data information from the engine data buffer in a loop, and calculates the working time t of the engine ignition program according to the current data cumulative 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 diagnosis time interval [t1, t2] corresponding to the working time.

[0133] 4.3.3, According to the mapping relationship of working time period-rule relationship, the corresponding rule of the diagnosis time interval, the rule relationship and the working section of the engine are obtained. It should be noted that the actual obtained rule can be one or more. Assuming that the current working time t∈[t1, t2], the corresponding rule is R2, Rv1, the rule relationship is R2∪Rv1, and the working section is the up-regulation section. The corresponding rules R2, Rv1 are shown in Table 3.

[0134] 4.3.4, One of the rules R2 is taken, and the corresponding investigation parameters P1, P2, P3 of the rule are obtained according to the mapping relationship of rule-parameter.

[0135] 4.3.5, According to the mapping relationship of parameter-dynamic range, the parameter range of the investigation parameters P1, P2, P3 is obtained, wherein the upper limit range is calculated by the mean and variance of the parameters of the last working section, and the lower limit is a fixed value, as shown in Table 4.

[0136] 4.3.6, Based on steps 4.3.4 and 4.3.5, it is determined whether the rule is abnormal according to the mapping relationship of rule-parameter. When more than or equal to two parameters of the investigation parameters P1, P2, P3 are out of range, it is abnormal, the rule R2 is true, and step 4.3.8 is executed; if it is not abnormal, return to step 4.3.1.

[0137] 4.3.7, The method of steps 4.3.4 to 4.3.6 is used to determine whether the rule Rv1 is abnormal, and step 4.3.8 is executed.

[0138] 4.3.8, Based on the abnormality determination results of steps 4.3.6 and 4.3.7, it is determined whether a fault occurs according to the mapping relationship of working time period-rule relationship, i.e. R2∪Rv1 is calculated. If R2 is true or Rv1 is true or both Rv1 and R2 are true, it is determined that a fault occurs. The determination result is fed back to the joint diagnosis module in combination with the working section of the engine. If both R2 and Rv1 are false, it is determined that a fault occurs, and step 4.3.1 is returned.

[0139] 4.4, The injection diagnosis thread is used to obtain the corresponding data information from the injection data buffer for diagnosis analysis and interpretation, and the interpretation result is fed back to the joint diagnosis module. In combination with Figure 4 , this step is specifically:

[0140] 4.4.1, The injection diagnosis thread is used to obtain the corresponding data information from the injection data buffer, and the working time t of the ignition program of the steam injection device in the water vapor generator is calculated 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 interval corresponding to the steam ejector device A group, B group, C group under the working time.

[0142] 4.4.3, according to the steam ejector device fault diagnosis rule, obtain the working section and its associated parameters of A group, B group, C group, and assume that the current time t a ∈[t3a,∞],t b ∈[t3b,∞],t c ∈[t3c,∞],that is, the water vapor generator of A, B, C group is in stable section.

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

[0144] According to the above method, whether B group and C group send emergency stop signal is judged respectively.

[0145] 4.5, the joint diagnosis module comprehensively judges 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】: according to the judgment result of step 【4】, combined with the disposal rule set in step 【2】, the working state of engine and / or steam ejector device is controlled correspondingly, so as to complete the joint fault diagnosis of engine and steam ejector device.

[0147] Combined Figure 5 and table 9, the joint fault diagnosis module combines the diagnosis and disposal of disposal unit, which is specifically:

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

[0149] 2) when the joint diagnosis module receives A group, B group or C group emergency stop signal, it is judged whether the water vapor generator ignition program working time is within k seconds (i.e. the time set in advance or required), if it is within k seconds, the A group, B group and C group water vapor generator are disposed by the disposal unit.

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

[0151] 4) Polling flag, when the number of emergency stop flag is greater than or equal to 2, the engine emergency stop disposal is carried out, and the emergency stop disposal of the corresponding group of water vapor generators is carried out through the disposal unit.

[0152] 5) When the number of emergency stop flags is equal to 1, the engine does not carry out emergency stop, and only the corresponding group of water vapor generators is disposed through the disposal unit.

[0153] 6) The water vapor generator group that does not receive the emergency stop signal continues to continuously suck for >100s, and the parking time is judged by the commander.

[0154] The application judges the failure mode when the steam ejector device fails and the engine is normal, and carries out parking of one group, two groups or multiple groups of water vapor generators and steam ejector pumps, and carries out parking of the engine according to the change of the upstream vacuum degree, so as to minimize the change gradient of the vacuum pressure, thereby reducing the damage of the downstream back pressure to the engine.

[0155] The application carries out online monitoring and joint diagnosis on the engine system, and carries out timely shutdown of the engine when the engine system fails and the steam ejector is normal, and the steam ejector system continuously works, so as to ensure the vacuum degree of the upstream, i.e. the vacuum degree of the environmental test chamber, thereby ensuring the safety of the engine product and the steam ejector system.

[0156] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the present application.

Claims

1. A fault joint diagnosis system of an engine and steam ejector device, characterized in that: 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; the input end of each measurement sensor is used to connect the engine and the steam ejector device and measure the corresponding parameter information; the input end of each distributed collector is connected with the output end of one or more measurement sensors, for supplying power to the corresponding measurement sensor and collecting the measured parameter information; the input end of each distributed controller is connected with the output end of one or more distributed collectors, and the output end is connected with the input end of the diagnosis unit, for pre-processing the parameter information and transmitting it to the diagnosis unit; the output end of the diagnosis unit is connected with the input end of the disposal unit, for converting the parameter information into corresponding data information, analyzing and interpreting, and transmitting the interpretation result to the disposal unit; the output end of the disposal unit is used to connect the actuator of the engine and the steam ejector device, and control the working state of the engine and / or the steam ejector device through the interpretation result.

2. The fault joint diagnosis system of the engine and the steam ejector device according to claim 1, characterized in that: the diagnosis unit comprises a data acquisition thread, a data classifier, a data buffer module, a data diagnosis thread and a joint diagnosis module connected in sequence; the input end of the data acquisition thread is connected with the output end of all distributed controllers, for collecting parameter information and converting it into data information and transmitting it to the data classifier; the data classifier is used to divide the data information into engine data information and ejector data information; the data buffer module comprises an engine data buffer and an ejector data buffer connected with the data classifier respectively, and the data classifier transmits the engine data information to the engine data buffer and the ejector data information to the ejector data buffer respectively; the data diagnosis thread comprises an engine diagnosis thread and an ejector diagnosis thread, the input end of each is connected with the engine data buffer and the ejector data buffer respectively, and the output end is connected with the joint fault diagnosis module respectively, for diagnosing and determining the engine data information and the ejector data information respectively, and feeding back the determination result to the joint diagnosis module; the joint diagnosis module is used to make joint diagnosis according to the determination result output by the data diagnosis thread and output the final determination result.

3. The fault joint diagnosis system of the engine and the steam ejector device according to claim 1 or 2, characterized in that: the measurement sensor is a double-redundant output measurement sensor; comprising the following steps: step 1, according to the structure and composition of the engine and the steam ejector device and the test requirements, determining the number and configuration of the measurement sensor, the distributed collector and the distributed controller, and assembling the fault joint diagnosis system of the engine and the steam ejector device according to any one of claims 1 to 3. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 4. A method of diagnosing a failure of an engine and a steam ejector device, characterized by, ​ ​ Step 【2】. According to the performance of the engine and the steam ejector device, the corresponding fault diagnosis rules are set in the diagnosis unit in advance, and the corresponding treatment rules are set in the treatment unit; Step 【3】. Start the engine and the steam ejector device, measure the corresponding parameter information through the measuring sensor, and transmit the parameter information to the diagnosis unit through the corresponding distributed collector and distributed controller in sequence; Step 【4】. The diagnosis unit diagnoses and interprets the parameter information according to the fault diagnosis rules set in step 【2】, and transmits the interpretation result to the treatment unit; Step 【5】. The treatment unit controls the working state of the engine and / or the steam ejector device according to the interpretation result of step 【4】 and the treatment rules set in step 【2】, thereby completing the fault joint diagnosis of the engine and the steam ejector device.

5. The fault joint diagnosis method of the engine and the steam ejector device according to claim 4, characterized in that: In step 【2】, the fault diagnosis rules include engine fault diagnosis rules and steam ejector device fault diagnosis rules; The engine fault diagnosis rules are realized through a three-level rule mapping structure, which includes a mapping relationship of working time period-rule relationship, a mapping relationship of rule-parameter, and a mapping relationship of parameter-dynamic range; The steam ejector device fault diagnosis rules are realized in a classification and segmentation manner, which means that the water vapor generator and the steam ejector pump in the steam ejector device are divided according to different working stages, wherein the working stages of the water vapor generator include the starting stage, the pressure building stage, and the stable stage; the working stage of the steam ejector pump is the load running stage.

6. The method of combined diagnosis of engine and steam-ejector malfunction according to claim 5, characterized in that, Step 【4】 is specifically: 4.

1. The data acquisition thread acquires the parameter information transmitted by the distributed controller, and transmits the parameter information to the data classifier after parsing the parameter information into corresponding data information by using a data parsing algorithm; 4.

2. The data classifier divides the data information into engine data information and ejector data information, and transmits them to the corresponding engine data buffer and ejector data buffer, respectively; 4.

3. The engine diagnosis thread acquires the corresponding data information from the engine data buffer for diagnosis and interpretation, and feeds back the interpretation result to the joint diagnosis module; 4.

4. The ejector diagnosis thread acquires the corresponding data information from the ejector data buffer for diagnosis and interpretation, and feeds back the interpretation result to the joint diagnosis module; 4.

5. The joint diagnosis module comprehensively judges the judgment results transmitted by steps 4.3 and 4.4, and transmits the final judgment result to the treatment unit.

7. The method of combined diagnosis of engine and steam-ejector malfunction according to claim 6, characterized in that, Step 4.3 is specifically: 4.3.

1. The engine diagnosis thread acquires the corresponding data information from the engine data buffer in a cycle, and calculates the working time of the engine ignition program according to the current data cumulative number in the data information; 4.3.

2. Based on the working time in step 4.3.1, the diagnosis time interval corresponding to the working time is obtained; 4.3.3, according to the mapping relationship between the working time period and the rule, obtaining the rule corresponding to the diagnostic time interval, the rule relationship and the working period of the engine; the rule is one or more; 4.3.4, taking any rule, according to the mapping relationship between the rule and the parameter, obtaining the corresponding investigation parameter of the rule; the investigation parameter is one or more; 4.3.5, according to the mapping relationship between the parameter and the dynamic range, obtaining the parameter range of each investigation parameter corresponding to the rule; 4.3.6, on the basis of steps 4.3.4 and 4.3.5, according to the mapping relationship between the rule and the parameter, determining whether the rule is abnormal, if yes, recording it as true, and executing step 4.3.8; otherwise, returning to step 4.3.1; 4.3.7, according to the method of steps 4.3.4 to 4.3.6, completing the determination of whether all other rules are abnormal, and executing step 4.3.8; 4.3.8, based on the abnormality determination results of steps 4.3.6 and 4.3.7, according to the mapping relationship between the working time period and the rule, determining whether the fault occurs, if yes, combining the working period of the engine according to step 4.3.3, feeding back the determination result to the joint diagnosis module; otherwise, returning to step 4.3.

1.

8. The method of combined diagnosis of engine and steam-ejector device malfunction according to claim 7, characterized in that, Step 4.4 is specifically: 4.4.1, using the injection diagnosis thread to cyclically obtain the corresponding data information from the injection data buffer, and calculating the working time of the water vapor generator ignition program in the steam injection device according to the current data accumulation number in the data information; 4.4.2, based on the working time of step 4.4.1, obtaining the working time interval corresponding to each component of the steam injection device under the working time; 4.4.3, according to the steam injection device fault diagnosis rule, obtaining the working period and its associated parameters of each component of the steam injection device, and determining whether it is abnormal and the type of abnormality, if there is abnormality, feeding back the determination result to the joint diagnosis module; otherwise, returning to step 4.4.

1.

9. The engine and steam injection device fault joint diagnosis method of claim 8, wherein: Step 4.5 is specifically: when the joint diagnosis module receives the determination result of step 4.3.8 that the engine needs to be urgently stopped, the determination result is directly transmitted to the disposal unit; When the joint diagnosis module receives the determination result of step 4.3.8 that the engine is normal, further determine the final determination result according to the determination result of step 4.4.3, and transmit the final determination result to the disposal unit.

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