Liquid level detection method, device and equipment of lubricating oil tank, medium and program product

Abstract

The invention relates to the technical field of aero-engines, in particular to a lubricating oil tank liquid level detection method, device and equipment, a medium and a program product. The method comprises the steps that the measured liquid level of oil in a lubricating oil tank of the aircraft is obtained, and current attitude information of the aircraft is obtained; the attitude information comprises a pitch angle, a yaw angle and a roll angle; based on a standard corresponding relation, a target standard liquid level corresponding to the current attitude information is determined, and the standard corresponding relation is the corresponding relation between the attitude information and the liquid level of the aircraft when oil in a lubricating oil tank is in a normal state; and determining a detection result based on the size relationship between the target standard liquid level and the measured liquid level. By means of the method, the precision of liquid level measurement of the oil in the lubricating oil tank can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of aircraft engines, and in particular to a method, device, equipment, medium and program product for detecting the liquid level of a lubricating oil tank. Background Art

[0002] The oil tank is a container used to store lubricating oil for the engine of an aircraft, and is usually fixed on the fuselage. In the oil circulation circuit between the oil tank and the engine, the oil-gas separator or abnormal leakage may cause oil loss, resulting in a reduction in the amount of oil in the oil tank; therefore, in order to ensure that the engine has sufficient oil supply during operation, it is necessary to monitor the oil level in the oil tank.

[0003] In the related art, conventional liquid level measurement methods are all based on sensor technology, that is, a liquid level sensor is set at a fixed position in the inner cavity of the lubricating oil tank to achieve liquid level measurement; then, based on the comparison between the liquid level measurement result and the set liquid level reference value, it is determined whether the oil volume has decreased or increased. However, this method is only suitable for aircraft with relatively stable flight attitudes. For aircraft that may have complex flight attitudes and drastically changing flight attitudes during flight, the lubricating oil tank will be affected by the complex flight attitudes, and the liquid level of the oil inside it will change significantly. At this time, the set liquid level reference value will lose its reference function, resulting in the measurement result of the liquid level sensor no longer being accurate.

[0004] Therefore, how to improve the accuracy of measuring the oil level in the lubricating oil tank is an urgent problem to be solved. Summary of the invention

[0005] Based on this, it is necessary to provide a method, device, equipment, medium and program product for detecting the liquid level of the oil tank in order to improve the accuracy of the liquid level measurement of the oil in the oil tank in order to solve the above technical problems.

[0006] In a first aspect, the present application provides a method for detecting a liquid level of a lubricating oil tank, comprising:

[0007] Obtaining the measured liquid level of the oil in the aircraft's lubricating oil tank, and obtaining the aircraft's current attitude information; the attitude information includes a pitch angle, a yaw angle, and a roll angle;

[0008] Determining a target standard liquid level corresponding to the current attitude information based on a standard corresponding relationship, wherein the standard corresponding relationship is a corresponding relationship between the attitude information of the aircraft and the liquid level when the oil in the lubricating oil tank is in a normal state;

[0009] The detection result is determined based on the magnitude relationship between the target standard liquid level and the measured liquid level.

[0010] In one embodiment, the process of constructing the standard correspondence relationship includes:

[0011] Constructing a three-dimensional model of the oil tank in a simulation environment;

[0012] Acquire multiple historical attitude information of the aircraft during historical flight, and set a fixed volume of the oil in a normal state in the simulation environment, wherein the fixed volume is the volume of the simulated oil in the three-dimensional model during each round of simulation;

[0013] For each of the historical posture information, using the historical posture information and the fixed volume as input data, simulating the distribution of the simulated oil in the three-dimensional model to obtain a standard liquid level corresponding to the historical posture information;

[0014] A standard corresponding relationship is constructed based on the standard liquid levels corresponding to the respective historical posture information.

[0015] In one embodiment, simulating the distribution of the simulated oil in the three-dimensional model to obtain the standard liquid level corresponding to the historical posture information includes:

[0016] Mapping the historical attitude information in a dynamic coordinate system to obtain simulated attitude information of the aircraft in the dynamic coordinate system, wherein the dynamic coordinate system is used to describe the simulated attitude of the aircraft;

[0017] Based on the conversion relationship between the reference coordinate system and the dynamic coordinate system, and the simulation posture information, determine the inclination angle of the three-dimensional model in the reference coordinate system, wherein the reference coordinate system is used to describe the liquid level position of the simulation oil in the three-dimensional model;

[0018] Based on the fixed volume and the tilt angle, simulating the distribution of the simulated oil in the three-dimensional model to obtain a standard position of the liquid surface of the simulated oil in the reference coordinate system;

[0019] Based on the standard position, a standard liquid level corresponding to the historical posture information is determined.

[0020] In one embodiment, the method further comprises:

[0021] The origins of the reference coordinate system and the dynamic coordinate system are both the geometric center of the aircraft.

[0022] In one embodiment, the measured liquid level is the liquid level of the oil measured at a reference position in the lubricating oil tank, wherein the reference position is a setting position of the liquid level sensor;

[0023] The standard liquid level is the liquid level of the simulated oil measured at a reference position in the three-dimensional model, and the reference position is a mapping position of the reference position in the three-dimensional model.

[0024] In one embodiment, during each round of simulation, the method further includes:

[0025] Acquiring the actual position of the simulated oil in the three-dimensional model in the reference coordinate system;

[0026] Based on the actual position, segmenting the inner cavity space of the three-dimensional model, and marking the actual space occupied by the simulated oil obtained after segmentation;

[0027] Determine the actual volume of the actual space, and determine the deviation value between the actual volume and the fixed volume;

[0028] When it is determined that the deviation value is 0, it is determined that the current round of simulation is finished.

[0029] In a second aspect, the present application further provides a liquid level detection device for a lubricating oil tank, the device comprising an information acquisition module, a target standard liquid level acquisition module and a detection result determination module, wherein:

[0030] An information acquisition module, used to acquire the measured liquid level of the oil in the aircraft's lubricating oil tank and to acquire the aircraft's current attitude information; the attitude information includes a pitch angle, a yaw angle, and a roll angle;

[0031] a target standard liquid level acquisition module, used to determine the target standard liquid level corresponding to the current attitude information based on a standard corresponding relationship, wherein the standard corresponding relationship is a corresponding relationship between the attitude information and the liquid level of the aircraft when the oil in the lubricating oil tank is in a normal state;

[0032] The detection result determination module is used to determine the detection result based on the size relationship between the target standard liquid level and the measured liquid level.

[0033] In a third aspect, the present application further provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0034] Obtaining the measured liquid level of the oil in the lubricating oil tank of the aircraft, and obtaining the current attitude information of the aircraft; the attitude information includes the pitch angle, the yaw angle and the roll angle;

[0035] a target standard liquid level acquisition module, used to determine the target standard liquid level corresponding to the current attitude information based on a standard corresponding relationship, wherein the standard corresponding relationship is a corresponding relationship between the attitude information and the liquid level of the aircraft when the oil in the lubricating oil tank is in a normal state;

[0036] The detection result is determined based on the magnitude relationship between the target standard liquid level and the measured liquid level.

[0037] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the following steps are implemented:

[0038] Obtaining the measured liquid level of the oil in the lubricating oil tank of the aircraft, and obtaining the current attitude information of the aircraft; the attitude information includes the pitch angle, the yaw angle and the roll angle;

[0039] a target standard liquid level acquisition module, used to determine the target standard liquid level corresponding to the current attitude information based on a standard corresponding relationship, wherein the standard corresponding relationship is a corresponding relationship between the attitude information and the liquid level of the aircraft when the oil in the lubricating oil tank is in a normal state;

[0040] The detection result is determined based on the magnitude relationship between the target standard liquid level and the measured liquid level.

[0041] In a fifth aspect, the present application further provides a computer program product, including a computer program, which implements the following steps when executed by a processor:

[0042] Obtaining the measured liquid level of the oil in the lubricating oil tank of the aircraft, and obtaining the current attitude information of the aircraft; the attitude information includes the pitch angle, the yaw angle and the roll angle;

[0043] a target standard liquid level acquisition module, used to determine the target standard liquid level corresponding to the current attitude information based on a standard corresponding relationship, wherein the standard corresponding relationship is a corresponding relationship between the attitude information and the liquid level of the aircraft when the oil in the lubricating oil tank is in a normal state;

[0044] The detection result is determined based on the magnitude relationship between the target standard liquid level and the measured liquid level.

[0045] The above-mentioned method, device, equipment, medium and program product for detecting the liquid level of the lubricating oil tank obtain the measured liquid level of the oil in the lubricating oil tank of the aircraft and the current attitude information of the aircraft during the process of the aircraft performing the flight action, so as to determine the target standard liquid level corresponding to the current attitude information according to the predetermined standard correspondence relationship between the attitude information of the aircraft and the liquid level. Since the target liquid level represents the standard liquid level in the lubricating oil tank when the oil in the lubricating oil tank of the aircraft is in a normal state, the detection result representing the normality or abnormality of the oil in the lubricating oil tank is determined by comparing the magnitude relationship between the target standard liquid level and the measured liquid level. Compared with the related art that only sets a fixed reference liquid level, in the detection method of the present application, the flight attitude corresponding to the aircraft at any time corresponds to a standard liquid level as a reference basis, so that the measured liquid level obtained at the time is compared with the standard liquid level corresponding to the flight attitude information at the time, so that the influence of different flight attitudes on the change of the liquid level height in the lubricating oil tank can be reduced, so that a more accurate detection result can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 It is a schematic flow chart of a method for detecting the liquid level of a lubricating oil tank in one embodiment;

[0048] Figure 2 A schematic diagram of a process flow of constructing a standard correspondence relationship in an embodiment;

[0049] Figure 3 A schematic diagram of a process flow of determining a standard liquid level through simulation in one embodiment;

[0050] Figure 4 A schematic diagram of the relationship between a dynamic coordinate system and a reference coordinate system in one embodiment;

[0051] Figure 5 A schematic diagram of a flow chart of a verification step in an embodiment;

[0052] Figure 6 is a structural block diagram of a liquid level detection device for a lubricating oil tank in one embodiment;

[0053] Figure 7 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0055] In an exemplary embodiment, a method for detecting the liquid level of an oil tank is provided, which is applied to an aircraft and executed by a computer device configured on the aircraft; wherein the aircraft includes but is not limited to various drones, aircraft, and other types of aircraft.

[0056] like Figure 1 As shown, the method for detecting the liquid level of the lubricating oil tank provided in the embodiment of the present application may specifically include steps 110 to 130, wherein:

[0057] Step 110: Obtain the measured liquid level of the oil in the aircraft's lubricating oil tank, and obtain the aircraft's current attitude information.

[0058] For the embodiment of the present application, a liquid level sensor is provided at a reference position in the oil tank of the aircraft to measure the liquid level of the oil in the oil tank at the reference position. The computer device obtains the liquid level measured by the liquid level sensor in real time as the measured liquid level. The attitude information of the aircraft includes at least the pitch angle, yaw angle and roll angle, and of course may also include other parameters, which are not specifically limited in the embodiment of the present application. Among them, the current attitude information of the aircraft can be determined in real time through the detection information of at least one of the horizontal sensor, gyroscope and angle sensor provided in the aircraft; the current attitude information of the aircraft can also be directly obtained from the control center of the aircraft.

[0059] Step 120: Determine the target standard liquid level corresponding to the current attitude information based on the standard corresponding relationship. The standard corresponding relationship is the corresponding relationship between the attitude information of the aircraft and the liquid level when the oil in the lubricating oil tank is in a normal state.

[0060] For the embodiment of the present application, the standard correspondence between the attitude information of the aircraft and the liquid level can be determined in advance through simulation, wherein, in the correspondence between the attitude information and the standard liquid level, the liquid level refers to the liquid level at the reference position in the lubricating oil tank. According to the correspondence between the attitude information and the standard liquid level, the liquid level corresponding to the current attitude information is determined as the target standard liquid level. The target standard liquid level represents the standard liquid level measured at the reference position in the lubricating oil tank when the aircraft is in a normal state under the current flight attitude.

[0061] Step 130: Determine the test result based on the magnitude relationship between the target standard liquid level and the measured liquid level.

[0062] For the embodiment of the present application, when determining the target standard liquid level corresponding to the current attitude information of the aircraft, the target standard liquid level is compared with the measured liquid level to obtain a comparison result; specifically, the target standard liquid level and the measured liquid level are subjected to a difference operation to determine the absolute value of the difference, that is, the difference between the target standard liquid level and the measured liquid level is determined, and the difference is used as the comparison result. Among them, when the difference is greater than or equal to the preset error value, the detection result is determined to be abnormal, that is, it indicates that the oil in the lubricating oil tank is in an abnormal state; when the difference is less than the preset error value, the detection result is determined to be normal, that is, it is determined that the oil in the tank is in a normal state.

[0063] In the above-mentioned oil tank liquid level detection method, during the process of the aircraft performing flight actions, the measured liquid level of the oil in the oil tank of the aircraft and the current attitude information of the aircraft are obtained, so as to determine the target standard liquid level corresponding to the current attitude information according to the predetermined standard correspondence relationship between the attitude information of the aircraft and the liquid level. Since the target liquid level represents the standard liquid level in the oil tank when the oil in the oil tank of the aircraft is in a normal state, the aircraft slides down the oil tank under the current flight attitude. Therefore, by comparing the magnitude relationship between the target standard liquid level and the measured liquid level, the detection result representing the normal or abnormal oil in the oil tank is determined. Compared with the related art that only sets a fixed reference liquid level, in the detection method of the present application, the flight attitude corresponding to the aircraft at any time corresponds to a standard liquid level as a reference basis, so that the measured liquid level obtained at this time is compared with the standard liquid level corresponding to the flight attitude information at this time, so as to reduce the influence of different flight attitudes on the change of the liquid level height in the oil tank, so as to obtain a more accurate detection result.

[0064] Further, in one embodiment, referring to Figure 2 The process of constructing a standard correspondence between the attitude information of the aircraft and the liquid level may specifically include steps 010 to 040, wherein:

[0065] Step 010: construct a three-dimensional model of the oil tank in a simulation environment.

[0066] Step 020, obtain multiple historical attitude information of the aircraft during the historical flight process, and set a fixed volume of the oil in the simulation environment when it is in a normal state. The fixed volume is the volume of the simulated oil in the three-dimensional model during each round of simulation.

[0067] Specifically, a three-dimensional model of the oil tank can be constructed by three-dimensional modeling software, for example, UG (Unigraphics NX) software can be used to construct a three-dimensional model of the oil tank, and the three-dimensional model can accurately reflect the geometric shape and internal structure of the oil tank. Among them, the historical attitude information of the aircraft can be obtained by the flight attitude sensor of the aircraft or the data interface of the control system of the aircraft, and the flight attitude sensor can be an IMU (Inertial Measurement Unit).

[0068] Furthermore, a fixed volume of the simulated oil (oil volume parameter) is set in the three-dimensional model of the oil tank, so as to ensure that the simulated oil volume remains constant during the subsequent measurement of the standard liquid level of the oil in the oil tank for each historical flight state, thereby improving the reliability of the measured standard liquid level. In other words, when measuring the simulated oil in the three-dimensional model of the oil tank for each historical flight state and determining the standard liquid level, the volume of the simulated oil is fixed; wherein the fixed volume indicates that the oil in the oil tank is in a normal state; the fixed volume can be set by the user, and the specific value of the fixed volume is not specifically limited in the embodiments of the present application.

[0069] Step 030: For each historical posture information, the distribution of the simulated oil in the three-dimensional model is simulated using the historical posture information and a fixed volume as input data to obtain a standard liquid level corresponding to the historical posture information.

[0070] Step 040: construct a standard corresponding relationship based on the standard liquid level corresponding to each historical posture information.

[0071] Specifically, the oil tank and the aircraft are fixedly arranged, and the oil tank always remains relatively still with the aircraft during the flight action of the aircraft. Therefore, the historical flight attitude data of the aircraft can characterize the deflection state of the aircraft as well as the deflection state of the oil tank. For each historical attitude information, each historical attitude information is input into a three-dimensional model constructed in a simulation environment for a round of simulation to obtain the standard liquid level corresponding to the historical simulation attitude. The specific logic of each round of simulation is: for each historical attitude information, the historical attitude information is input into the three-dimensional model as input data, and the three-dimensional model of the oil tank is adjusted in attitude using the three-dimensional modeling software, so as to perform simulation based on the fixed volume of simulated oil in the set three-dimensional model. Further, the liquid level of the simulated oil is measured at the reference position in the three-dimensional model, and finally the standard liquid level corresponding to each historical attitude information is obtained. The standard liquid level is the liquid level of the simulated oil measured at the reference position in the three-dimensional model, and the reference position is the mapping position of the reference position in the three-dimensional model.

[0072] Furthermore, a polynomial interpolation method or a data fitting method can be used to construct a corresponding relationship curve between flight attitude information and standard liquid level by using the standard liquid level corresponding to each historical attitude information. Alternatively, each historical attitude information and the standard liquid level corresponding to the historical attitude information are used as a training sample, so that multiple training samples can be obtained based on the standard liquid level corresponding to each historical attitude information. Then, the initial network model is trained using the training samples to obtain a trained standard liquid level determination model. The standard liquid level determination model is used to output the standard liquid level of the reference position in the lubricating oil tank based on the input real-time current status information of the aircraft.

[0073] Further, refer to Figure 3 In step 030, the process may specifically include steps 031 to 034, wherein:

[0074] Step 031, map the historical attitude information in the dynamic coordinate system to obtain the simulated attitude information of the aircraft in the dynamic coordinate system. The dynamic coordinate system is used to describe the simulated attitude of the aircraft.

[0075] Step 032: Based on the conversion relationship between the reference coordinate system and the dynamic coordinate system, and the simulation posture information, determine the inclination angle of the three-dimensional model in the reference coordinate system. The reference coordinate system is used to describe the liquid level position of the simulated oil in the three-dimensional model.

[0076] Two three-dimensional coordinate systems are constructed in the three-dimensional model, namely the dynamic coordinate system and the reference coordinate system. The description object of the dynamic coordinate system is the aircraft. Since the oil tank and the aircraft are fixedly set, the oil tank always remains relatively still with the aircraft during the flight action of the aircraft. Therefore, the description object of the dynamic aircraft can also be the oil tank (three-dimensional model). The description object of the reference coordinate system is the liquid level of the simulated oil in the oil tank. The posture of the aircraft in the motion coordinate system is updated in real time with the changes of the historical simulation posture information input each time.

[0077] Specifically, the motion coordinate system 0xyz is fixed to the aircraft and moves with the aircraft. The center of mass of the aircraft is selected as the coordinate origin. The 0x axis is in the symmetry plane of the aircraft, parallel to the fuselage axis, and pointing forward; the 0z axis is also in the symmetry plane, perpendicular to the axis 0x, pointing downward; and 0y is perpendicular to the symmetry plane and points to the right. is the angle between the oil plane and the 0y plane in the moving coordinate system, is the angle between the oil plane and the 0x plane of the dynamic coordinate system. The oil plane is always parallel to the sea level, and the oil surface normal vector is always [0, 0, 1]. The reference coordinate system can directly use the default coordinate system in the 3D modeling software, where the reference coordinate system and the dynamic coordinate system can share the same origin, for example, the center of mass or geometric center of the aircraft. Figure 4The figure shows the relationship between the dynamic coordinate system and the reference coordinate system.

[0078] Specifically, the input historical posture information is mapped into the motion coordinate system according to the rotation matrix. The specific process can be represented by matrix group (1) and matrix group (2), where:

[0079] , matrix group (1);

[0080] , matrix group (2).

[0081] in, Indicates the pitch angle in the historical attitude information (the angle between the aircraft's body axis and the horizontal plane, which is positive when the aircraft's head is tilted upward); It represents the roll angle in the historical attitude information (the angle between the aircraft's symmetry plane and the vertical plane, the angle formed when rolling right, and is required to be positive). The yaw angle is also equivalent to the aircraft's rotation angle around the vertical line of the ground. When the rotation speed is not large, it has little effect on the measurement, so it is not considered during measurement.

[0082] Furthermore, the flight attitude normal vector of the aircraft in the historical flight attitude can be expressed by formula (1): , formula (1).

[0083] Specifically, for each round of simulation, the geometric calculation capability of the three-dimensional modeling software is used to calculate the oil position of the simulated oil corresponding to the three-dimensional model of the lubricating oil tank under the historical flight attitude.

[0084] An API (Application Programming Interface) interface is set for the constructed 3D model to build a secondary development module. The secondary development of the 3D model can be realized through the API interface; secondary development means that relevant data can be input and configured into the 3D model, such as fixed volume (oil volume parameter) and historical posture information. Through the secondary development interface module, the calculated oil level depth value can be output to the level monitoring system in real time to ensure that the level monitoring system can display the changes in the oil depth inside the descent tank under different flight attitudes. The secondary development module can calculate the oil level depth of the simulated oil in the 3D model in real time, and adjust the distribution of the simulated oil in the 3D model according to the input fixed volume and historical posture information to form a closed-loop control.

[0085] The secondary development module can be used for oil volume input and model calculation control, oil level depth and standard liquid level calculation, and real-time output of standard liquid level and oil level depth, including:

[0086] Oil volume input and model calculation control: Input a fixed volume (oil volume parameter) in the secondary development interface module, and update the relationship between the standard liquid level and posture information in real time;

[0087] Oil level depth and liquid level calculation: Use fixed volume and current flight attitude (input historical attitude information) to calculate oil level depth and standard liquid level in real time, and update the calculation results to the 3D model;

[0088] Real-time output of liquid level depth: The oil level depth and the inclination angle of the oil plane in the three-dimensional model are transmitted to the liquid level monitoring system through the interface of the secondary development module to realize real-time output and update of oil data.

[0089] Step 033: Based on the fixed volume and the tilt angle, the distribution of the simulated oil is simulated in the three-dimensional model to obtain the standard position of the liquid surface of the simulated oil in the reference coordinate system;

[0090] Step 034: Based on the standard position, determine the standard liquid level corresponding to the historical posture information.

[0091] For each round of simulation, the historical posture information is input into the secondary development interface module to realize the configuration in the 3D model; the inclination angle of the simulated oil surface relative to the reference coordinate system is calculated based on the historical posture information and , and determine the liquid surface position of the simulated oil in the 3D model to ensure that the liquid surface of the simulated oil is always parallel to the reference coordinate system (sea level). and It can be calculated by formula (2) and formula (3) respectively, where:

[0092] , formula (2); , formula (3).

[0093] in, Indicates the pitch angle in the historical attitude information (the angle between the aircraft's body axis and the horizontal plane, which is positive when the aircraft's head is tilted upward); It represents the roll angle in the historical attitude information (the angle between the aircraft's symmetry plane and the vertical plane, the angle formed when rolling right, and is required to be positive). The yaw angle is also equivalent to the aircraft's rotation angle around the vertical line of the ground. When the rotation speed is not large, it has little effect on the measurement, so it is not considered during measurement.

[0094] Furthermore, in each round of simulation, after inputting the historical posture information, the model needs to adjust and configure its posture for a period of time to obtain a more accurate simulation calculation result (standard liquid level), thereby determining the end of the current round of simulation.

[0095] Therefore, in the embodiment of the present application, a verification step is also provided to determine whether any round of simulation is completed. Figure 5 The verification step may specifically include step 001 to step 004, wherein:

[0096] Step 001, obtaining the actual position of the simulated oil in the three-dimensional model in the reference coordinate system;

[0097] Step 002: segment the inner cavity space of the three-dimensional model based on the actual position, and mark the actual space occupied by the simulated oil obtained after segmentation;

[0098] Step 003: Determine the actual volume of the actual space, and determine the deviation value between the actual volume and the fixed volume;

[0099] Step 004: When the deviation value is determined to be 0, the current round of simulation is determined to be finished.

[0100] Furthermore, the plane where the oil level of the determined oil is located is used as a dividing plane, and the three-dimensional model of the lubricating oil tank is divided by the dividing plane, with air above the oil plane and lubricating oil below the plane; the inner cavity space of the three-dimensional model of the lubricating oil tank is divided into an upper air area and a lower oil area, and the volume of the divided oil area (the actual volume of the simulated oil in the actual space occupied), the oil level depth, and the standard liquid level are calculated in real time. The difference between the actual volume of the actual space occupied by the simulated oil and the preset fixed volume of the simulated oil is further determined. If the difference is 0, it is guaranteed that the current round of simulation is completed, and the simulation calculation results (standard liquid level) can be used. If the difference is not 0, it means that the posture adjustment and configuration of the current three-dimensional model have not been completed, and the simulation calculation results at this time are not available. When the difference is not 0, it is necessary to wait for the model to be automatically updated and adjusted, and determine the oil level position again after a preset period of time, then re-divide the oil surface, and recalculate the difference between the actual volume of the simulated oil and the fixed volume. When the difference is 0, the simulation of the current round is determined to be over, and the simulation calculation result corresponding to the difference of 0 is used as the standard liquid level output of the current round.

[0101] Therefore, the simulation process for each round mentioned above can be summarized as follows: based on the fixed volume, the oil surface depth and the standard liquid level are calculated in real time; the oil surface position and segmentation state of the oil are calculated based on the historical posture information, and the oil surface depth and the standard liquid level are output in real time.

[0102] In summary, the oil tank level detection method provided in the embodiment of the present application is suitable for the level detection in the oil tank of an aircraft under complex flight attitudes, and can effectively reduce the influence of attitude changes on the accuracy of oil level measurement; wherein, complex flight attitudes include but are not limited to rapid climbs, dives, rolls, and other drastic attitude change states. In addition, the calculation result of the liquid surface depth can be used for oil tank level alarm and oil distribution state analysis, and can further form a level control strategy through secondary development functions to ensure that the oil inside the tank is within a safe level range and prevent safety hazards caused by abnormal fluctuations in the oil volume.

[0103] It should be understood that, although the steps in the flowcharts involved in the above embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0104] Based on the same inventive concept, the embodiment of the present application also provides a lubricating oil tank liquid level detection device for implementing the above-mentioned lubricating oil tank liquid level detection method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above-mentioned method, so the specific limitations in the embodiments of one or more lubricating oil tank liquid level detection devices provided below can refer to the limitations of the lubricating oil tank liquid level detection method above, and will not be repeated here.

[0105] In an exemplary embodiment, Figure 6 As shown, a liquid level detection device for a lubricating oil tank is provided, the device comprises an information acquisition module 601, a target standard liquid level acquisition module 602 and a detection result determination module 603, wherein:

[0106] The information acquisition module 601 is used to obtain the measured liquid level of the oil in the aircraft's lubricating oil tank and obtain the aircraft's current attitude information; the attitude information includes the pitch angle, yaw angle and roll angle;

[0107] The target standard liquid level acquisition module 602 is used to determine the target standard liquid level corresponding to the current attitude information based on the standard corresponding relationship, and the standard corresponding relationship is the corresponding relationship between the attitude information of the aircraft and the liquid level when the oil in the lubricating oil tank is in a normal state;

[0108] The detection result determination module 603 is used to determine the detection result based on the magnitude relationship between the target standard liquid level and the measured liquid level.

[0109] In the above-mentioned oil tank liquid level detection device, during the process of the aircraft performing flight actions, the measured liquid level of the oil in the oil tank of the aircraft and the current attitude information of the aircraft are obtained, so as to determine the target standard liquid level corresponding to the current attitude information according to the predetermined standard correspondence relationship between the attitude information of the aircraft and the liquid level. Since the target liquid level represents the standard liquid level in the oil tank when the oil in the oil tank of the aircraft is in a normal state, the aircraft slides down the oil tank under the current flight attitude. Therefore, by comparing the magnitude relationship between the target standard liquid level and the measured liquid level, the normal or abnormal detection result of the oil in the oil tank is determined. Compared with the related art that only sets a fixed reference liquid level, in the detection method of the present application, the corresponding flight attitude of the aircraft at any time corresponds to a standard liquid level as a reference basis, so that the measured liquid level obtained at this time is compared with the standard liquid level corresponding to the flight attitude information at this time, so as to reduce the influence of different flight attitudes on the change of the liquid level in the oil tank, so as to obtain a more accurate detection result.

[0110] In one embodiment, the liquid level detection device of the lubricating oil tank further includes a relationship building module, and the relationship building module is specifically used for:

[0111] Construct a 3D model of the oil tank in a simulation environment;

[0112] Obtain multiple historical attitude information of the aircraft during historical flight, and set a fixed volume of the oil in a normal state in the simulation environment. The fixed volume is the volume of the simulated oil in the three-dimensional model during each round of simulation.

[0113] For each historical posture information, the distribution of the simulated oil in the three-dimensional model is simulated with the historical posture information and the fixed volume as input data to obtain the standard liquid level corresponding to the historical posture information;

[0114] Based on the standard liquid levels corresponding to each historical posture information, a standard corresponding relationship is constructed.

[0115] In one embodiment, the relationship building module is further configured to:

[0116] Mapping the historical attitude information in the dynamic coordinate system to obtain the simulated attitude information of the aircraft in the dynamic coordinate system. The dynamic coordinate system is used to describe the simulated attitude of the aircraft;

[0117] Based on the conversion relationship between the reference coordinate system and the dynamic coordinate system, as well as the simulation posture information, the inclination angle of the three-dimensional model in the reference coordinate system is determined. The reference coordinate system is used to describe the liquid level position of the simulated oil in the three-dimensional model.

[0118] Based on the fixed volume and tilt angle, the distribution of the simulated oil is simulated in the three-dimensional model to obtain the standard position of the liquid surface of the simulated oil in the reference coordinate system;

[0119] Based on the standard position, the standard liquid level corresponding to the historical posture information is determined.

[0120] In one embodiment, the origins of the reference coordinate system and the dynamic coordinate system are both the geometric center of the aircraft.

[0121] In one embodiment, the measured liquid level is the liquid level of the oil measured at a reference position in the lubricating oil tank, wherein the reference position is the setting position of the liquid level sensor;

[0122] The standard liquid level is the liquid level of the simulated oil measured at a reference position in the three-dimensional model, and the reference position is the mapping position of the reference position in the three-dimensional model.

[0123] In one embodiment, the liquid level detection device of the lubricating oil tank further includes a verification module, and the verification module is specifically used in each round of simulation to:

[0124] Obtain the actual position of the simulated oil in the three-dimensional model in the reference coordinate system;

[0125] Based on the actual position, the inner cavity space of the three-dimensional model is segmented, and the actual space occupied by the simulated oil obtained after segmentation is marked;

[0126] Determine the actual volume of the actual space and the deviation between the actual volume and the fixed volume;

[0127] When the deviation value is determined to be 0, the current round of simulation is determined to be finished.

[0128] Each module in the above-mentioned oil tank liquid level detection device can be implemented in whole or in part by software, hardware or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute the corresponding operations of each module.

[0129] In an exemplary embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as shown in FIG. Figure 7As shown. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a method for detecting the liquid level of a lubricating oil tank is realized. The display unit of the computer device is used to form a visually visible picture, which can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the computer device shell, or an external keyboard, touchpad or mouse.

[0130] Those skilled in the art will understand that Figure 7 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0131] In an exemplary embodiment, a computer device is provided, including a memory and a processor. The memory stores a computer program, and the processor implements the steps in the above-mentioned oil tank liquid level detection method embodiment when executing the computer program.

[0132] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method for detecting the liquid level of a lubricating oil tank are implemented.

[0133] In one embodiment, a computer program product is provided, including a computer program. When the computer program is executed by a processor, the steps in the above-mentioned method for detecting the liquid level of a lubricating oil tank are implemented.

[0134] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0135] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0136] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0137] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for detecting the liquid level of a lubricating oil tank, characterized in that: The method comprises: Obtaining the measured liquid level of the oil in the aircraft's lubricating oil tank, and obtaining the aircraft's current attitude information; the attitude information includes a pitch angle, a yaw angle, and a roll angle; Determining a target standard liquid level corresponding to the current attitude information based on a standard corresponding relationship, wherein the standard corresponding relationship is a corresponding relationship between the attitude information of the aircraft and the liquid level when the oil in the lubricating oil tank is in a normal state; The detection result is determined based on the magnitude relationship between the target standard liquid level and the measured liquid level.

2. The method according to claim 1, characterized in that The process of constructing the standard correspondence relationship includes: Constructing a three-dimensional model of the oil tank in a simulation environment; Acquire multiple historical attitude information of the aircraft during historical flight, and set a fixed volume of the oil in a normal state in the simulation environment, wherein the fixed volume is the volume of the simulated oil in the three-dimensional model during each round of simulation; For each of the historical posture information, using the historical posture information and the fixed volume as input data, simulating the distribution of the simulated oil in the three-dimensional model to obtain a standard liquid level corresponding to the historical posture information; A standard corresponding relationship is constructed based on the standard liquid levels corresponding to the respective historical posture information.

3. The method according to claim 2, characterized in that The simulating the distribution of the simulated oil in the three-dimensional model to obtain the standard liquid level corresponding to the historical posture information includes: Mapping the historical attitude information in a dynamic coordinate system to obtain simulated attitude information of the aircraft in the dynamic coordinate system, wherein the dynamic coordinate system is used to describe the simulated attitude of the aircraft; Based on the conversion relationship between the reference coordinate system and the dynamic coordinate system, and the simulation posture information, determine the inclination angle of the three-dimensional model in the reference coordinate system, wherein the reference coordinate system is used to describe the liquid level position of the simulation oil in the three-dimensional model; Based on the fixed volume and the tilt angle, simulating the distribution of the simulated oil in the three-dimensional model to obtain a standard position of the liquid surface of the simulated oil in the reference coordinate system; Based on the standard position, a standard liquid level corresponding to the historical posture information is determined.

4. The method according to claim 3, characterized in that The method further comprises: The origins of the reference coordinate system and the dynamic coordinate system are both the geometric center of the aircraft.

5. The method according to claim 3, characterized in that: The measured liquid level is the liquid level of the oil measured at a reference position in the lubricating oil tank, wherein the reference position is the setting position of the liquid level sensor; The standard liquid level is the liquid level of the simulated oil measured at a reference position in the three-dimensional model, and the reference position is a mapping position of the reference position in the three-dimensional model.

6. The method according to any one of claims 3 to 5, characterized in that: During each round of simulation, the method further includes: Acquiring the actual position of the simulated oil in the three-dimensional model in the reference coordinate system; Based on the actual position, segmenting the inner cavity space of the three-dimensional model, and marking the actual space occupied by the simulated oil obtained after segmentation; Determine the actual volume of the actual space, and determine the deviation value between the actual volume and the fixed volume; When it is determined that the deviation value is 0, it is determined that the current round of simulation is finished.

7. A liquid level detection device for a lubricating oil tank, characterized in that: The device comprises an information acquisition module, a target standard liquid level acquisition module and a detection result determination module, wherein: An information acquisition module, used to acquire the measured liquid level of the oil in the aircraft's lubricating oil tank and to acquire the aircraft's current attitude information; the attitude information includes a pitch angle, a yaw angle, and a roll angle; a target standard liquid level acquisition module, used to determine the target standard liquid level corresponding to the current attitude information based on a standard corresponding relationship, wherein the standard corresponding relationship is a corresponding relationship between the attitude information and the liquid level of the aircraft when the oil in the lubricating oil tank is in a normal state; The detection result determination module is used to determine the detection result based on the size relationship between the target standard liquid level and the measured liquid level.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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