Fuel oil measuring system, control method and aircraft

Abstract

The invention discloses a fuel oil measurement system, a control method and an aircraft, relates to the technical field of fuel oil measurement, and is used for solving the problem that alarm information is transmitted to a display through the same link to cause common-mode failure. The fuel oil measuring system provided by the invention comprises an oil quantity sensor, a controller and a controller, wherein the oil quantity sensor is used for collecting oil quantity information of oil in an oil tank; the oil level sensor comprises an optical fiber arranged in the oil tank, the optical fiber responds to the height change of the oil level in the oil tank, one end of the optical fiber is optically connected to the light source, and the other end outputs an optical signal corresponding to the height of the oil level; the data processing module is configured to receive and demodulate the optical signal to obtain oil level and liquid level information and judge whether first oil level warning information is triggered or not based on the oil level and liquid level information; the fuel oil computer judges whether second oil level warning information is triggered or not based on the oil level liquid level information and the oil quantity information; and the display is configured to receive and display the first oil level alarm information or receive and display the second oil level alarm information through the second link.

Description

Technical Field

[0001] The present application relates to the technical field related to aviation fuel systems, and in particular to a fuel measurement system, a control method and an aircraft. Background Art

[0002] The fuel measurement system of civil aircraft is an important part of the aircraft functional system. Its most important function is to stably and accurately measure the remaining fuel in the aircraft tank and the distribution of fuel in each tank under different working conditions, and provide the aircraft with a low fuel warning function. Among them, "the fuel indication error and the loss of the low fuel level warning" is a Class I failure problem, which affects the safety of the aircraft.

[0003] The aircraft wing fuel tank is separated by ribs, and the ribs are arranged with oil holes to balance the center of gravity, balance the oil level, balance the air pressure in the tank and ensure the flow of oil. At present, most aircraft use capacitive low oil level sensors. When the "oil level is less than or equal to the low oil level sensor threshold", the low oil level alarm will be triggered. However, both the low oil level sensor and the oil sensor use the capacitive sensing principle, and the alarm information is transmitted to the display through the same link, resulting in common mode failure. Summary of the invention

[0004] The present application provides a fuel measurement system, a control method and an aircraft, which can solve the problem that the existing warning information is transmitted to the display through the same link, resulting in common mode failure.

[0005] To achieve the above purpose, the fuel measurement system provided by this application includes:

[0006] An oil level sensor is disposed in the oil tank and is used to collect oil level information of the oil in the oil tank;

[0007] An oil level sensor, comprising an optical fiber disposed in the oil tank, both ends of the optical fiber extending out of the oil tank, the optical fiber responding to a height change of the oil level in the oil tank, one end of the optical fiber being optically connected to a light source, and the other end outputting an optical signal corresponding to the height of the oil level;

[0008] a data processing module configured to receive and demodulate the optical signal to obtain the oil level information of the oil tank, and determine whether to trigger the first oil level alarm information based on the oil level information;

[0009] a fuel computer, coupled to the fuel level sensor and coupled to the data processing module via a first link, and determining whether to trigger second fuel level warning information based on the fuel level information and the fuel level information;

[0010] The display is configured to receive and display the first oil level warning information or receive and display the second oil level warning information through a second link.

[0011] In this technical solution, the oil level sensor includes an optical fiber arranged in the oil tank. The optical fiber in the oil level sensor can respond to the height change of the oil level in the oil tank, output an optical signal corresponding to the height of the oil level, and obtain the oil level information through the data processing module. It adopts a non-capacitive sensor structure, which is independent and non-similar to the capacitive oil quantity sensor, and the optical fiber has excellent anti-electromagnetic interference characteristics to reduce the problem of common mode failure of the fuel measurement system. In addition, the application adds a second link coupling the display and the data processing module, which can directly transmit the first oil level alarm information triggered by the data processing module to the display for display, so as to further reduce the common mode failure of the fuel measurement system.

[0012] On the other hand, the present application further provides a control method for a fuel measurement system, the control method being executed via the fuel measurement system, the fuel measurement system comprising a display, a fuel quantity sensor and a fuel level sensor disposed in a fuel tank, the fuel level sensor comprising an optical fiber disposed in the fuel tank, both ends of the optical fiber extending out of the fuel tank, the optical fiber responding to a height change of the oil level in the fuel tank, the control method comprising:

[0013] Obtaining the oil quantity information of the oil in the oil tank;

[0014] One end of the optical fiber is optically connected to a light source, and the other end outputs an optical signal corresponding to the height of the oil level;

[0015] Demodulating the optical signal to obtain oil level information of the oil tank, and determining whether to trigger the first oil level alarm information according to the oil level information;

[0016] Determining whether to trigger a second oil level warning message according to the oil level information and the oil quantity information;

[0017] The first oil level warning information or the second oil level warning information is displayed through the display.

[0018] In this technical solution, the oil level sensor includes an optical fiber arranged in the oil tank. The optical fiber in the oil level sensor can respond to the height change of the oil level in the oil tank and output an optical signal corresponding to the height of the oil level. The optical signal is demodulated and processed by the data processing module to obtain the oil level information. The oil level sensor adopts a non-capacitive sensor structure, which is independent and non-similar to the capacitive oil level sensor, and the optical fiber has excellent anti-electromagnetic interference characteristics to reduce the problem of common mode failure of the fuel measurement system. In addition, the display of the present application can display the first oil level warning information or the second oil level warning information through different coupling paths to further reduce common mode failure.

[0019] On the other hand, the present application also provides an aircraft, comprising the above-mentioned fuel measurement system, wherein the fuel tank is configured as a wing fuel tank of the aircraft.

[0020] Since the fuel measurement system in the aircraft of the present application has the same structure as the fuel measurement system recorded in any of the above technical solutions, the two can solve the same technical problems and achieve the same technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 is a system block diagram of a fuel measurement system in an embodiment of the present application;

[0023] Figure 2 This is a schematic diagram of the structure of an oil level sensor in a fuel measurement system according to an embodiment of the present application;

[0024] Figure 3 is a control flow chart of a fuel computer in a fuel measurement system according to an embodiment of the present application;

[0025] Figure 4 is a control flow chart of a display in a fuel measurement system according to an embodiment of the present application;

[0026] Figure 5 It is another structural schematic diagram of the oil level sensor in the fuel measurement system of the embodiment of the present application;

[0027] Figure 6 It is a structural schematic diagram of an arrangement of an oil level sensor in a fuel measurement system according to an embodiment of the present application;

[0028] Figure 7 It is another structural schematic diagram of the oil level sensor in the fuel measurement system of the embodiment of the present application;

[0029] Figure 8 It is a structural schematic diagram of another arrangement of the oil level sensor in the fuel measurement system of the embodiment of the present application;

[0030] Fig. 9 It is a control flow chart of the fuel measurement system of the embodiment of the present application.

[0031] The main reference numerals in the drawings of this application specification are described as follows:

[0032] 1- oil level sensor; 11- optical fiber; 111- first end; 112- second end; 12- diaphragm; 13- casing; 14- packaging structure; 15- force transmission member;

[0033] 10-first link; 20-second link; 30-third link;

[0034] 100- oil tank; 101- oil level; 102- rib; 200- light source. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0036] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0037] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0038] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] The present application provides a fuel measurement system, a control method and an aircraft, which are described in detail below. It should be noted that the description order of the following embodiments does not limit the preferred order of the embodiments of the present application. In the following embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0040] Reference Figure 1 and Figure 2 The fuel measurement system provided in the present application includes a fuel quantity sensor, a fuel level sensor, a data processing module, a fuel computer and a display. The fuel quantity sensor is arranged in the fuel tank 100, and is used to collect fuel quantity information of the oil in the fuel tank 100. The fuel level sensor 1 includes an optical fiber 11 arranged in the fuel tank 100, and the optical fiber 11 has a first end 111 and a second end 112 extending out of the fuel tank 100. The first end 111 is used for optical connection to the light source 200. The optical fiber 11 responds to the height change of the oil level 101 in the fuel tank 100, and outputs an optical signal corresponding to the height of the oil level 101 through the second end 112.

[0041] The data processing module is coupled to the second end 112 and is configured to receive and demodulate the optical signal to obtain the oil level information of the oil tank 100 and determine whether to trigger the first oil level alarm information based on the oil level information.

[0042] The fuel computer is coupled to the oil level sensor and is coupled to the data processing module via the first link 10 to receive oil level information and oil level information, and determines whether to trigger the second oil level alarm information based on the oil level information and the oil level information.

[0043] The display is coupled to the fuel computer and to the data processing module via the second link 20 , and is configured to receive and display the first oil level warning information via the second link 20 , or to receive and display the second oil level warning information.

[0044] In this technical solution, the oil level sensor 1 includes an optical fiber 11, which is arranged in the oil tank 100. The optical fiber 11 in the oil level sensor 1 can respond to the height change of the oil level 101 in the oil tank 100, output an optical signal corresponding to the height of the oil level 101, and obtain the oil level information through the data processing module. It adopts a non-capacitive sensor structure, which is independent and non-similar to the capacitive oil quantity sensor, and the optical fiber 11 has excellent anti-electromagnetic interference characteristics to reduce the problem of common mode failure of the fuel measurement system. In addition, the application adds a second link 20 to couple the display and the data processing module, which can directly transmit the first oil level alarm information triggered by the data processing module to the display for display, so as to further reduce the common mode failure of the fuel measurement system.

[0045] In some embodiments of the present application, the oil level information includes liquid level digital quantity information and liquid level discrete quantity information. The judgment unit of the data processing module is configured to judge whether to trigger the first oil level alarm information based on the liquid level discrete quantity information. The fuel computer judges whether to trigger the second oil level alarm information based on the received liquid level digital quantity information and oil quantity information. The present application uses liquid level digital quantity information and liquid level discrete quantity information to judge the oil level alarm, and can improve the reliability and accuracy of the fuel measurement system through multiple verifications. The independent judgment of the liquid level digital quantity information and the liquid level discrete quantity information can verify each other, reducing the possibility of false alarms and missed alarms of the oil level alarm. At the same time, the second oil level alarm information is transmitted to the display by the fuel computer, while the first oil level alarm information is directly transmitted to the display through the second link 20. The two transmission paths are independent and non-similar, reducing common mode failures.

[0046] Based on the above embodiments, Figure 3 As shown, the fuel computer is configured to determine whether to trigger the second fuel level alarm information through the following operations. Specifically, if the liquid level digital quantity information is less than or equal to the first preset threshold value and lasts for the first preset time, or if the fuel quantity information is less than or equal to the second preset threshold value and lasts for the second preset time, the fuel computer triggers the second fuel level alarm information. The fuel measurement system determines whether to trigger the second fuel level alarm information through multiple paths, which increases the accuracy of the judgment and avoids the problem of false alarm or missed alarm caused by single path judgment.

[0047] At the same time, in the fuel measurement system, due to the fluctuation of the carrier object where the fuel tank 100 is located, the liquid level digital quantity information may fluctuate or be mismeasured for a short time. By judging the duration, such instantaneous fluctuations can be eliminated to ensure that the alarm is triggered only when the oil level is continuously less than or equal to the first preset threshold, which helps to reduce false alarms caused by short-term fluctuations. Therefore, on the basis that the liquid level digital quantity information is less than or equal to the first preset threshold, the present application also determines whether the duration of the liquid level digital quantity information being less than or equal to the first preset threshold is greater than or equal to the first preset duration. Similarly, if the oil quantity information is less than or equal to the second preset threshold and lasts for the second preset duration, the fuel computer triggers the second oil level alarm information. By way of example, the first preset duration and the second preset duration are both 30s.

[0048] It is understandable that the data processing module determines whether to trigger the first oil level warning information by the following operation: if the oil level discrete quantity information of the oil tank is less than or equal to the third preset threshold value and lasts for the third preset time, the data processing module triggers the first oil level warning information. For example, the third preset time can also be 30s.

[0049] like Figure 4As shown, the display is also configured to determine the authenticity of the first oil level alarm information obtained through the second link 20. If the first oil level alarm information is true, the first oil level alarm information is displayed. Therefore, the first oil level alarm information is checked once in the data processing module and checked twice in the display to ensure the reliability and accuracy of the oil level alarm operation of the fuel measurement system. For example, the display can check the authenticity of the first oil level alarm information according to the agreed interface definition. For example, it is pre-agreed that when the display receives GND, it indicates an alarm, and when the display receives OPEN, it indicates no alarm. Therefore, when the display receives the GND signal, it indicates that the height of the oil level 101 in the fuel tank 100 is too low, and the user needs to be alerted. When the display receives the OPEN signal, it indicates that the fuel measurement system is in a normal state and no alarm condition is triggered.

[0050] In some embodiments of the present application, the fuel measurement system further includes an avionics system (i.e., an IMA network), the data interface of the avionics system is coupled to the fuel computer, and is coupled to the data processing module via the third link 30, and the avionics system is coupled to the display via the A429 bus. The avionics system is configured to receive and verify whether to send the first fuel level warning information and to verify whether to send the second fuel level warning information to the display for display, so as to ensure the accuracy of the first fuel level warning information and the second fuel level warning information.

[0051] In other words, the oil level sensor 1 continuously monitors the oil level of the oil tank 100. When the oil level information is demodulated by the data processing module, the oil level information transmits the alarm information to the display through three paths.

[0052] First, the oil level sensor 1 transmits the corresponding optical signal to the data processing module, and the demodulated liquid level digital quantity information (a type of oil level information) is transmitted to the fuel computer. The fuel computer determines whether to trigger the second oil level alarm information based on the oil level information and liquid level digital quantity information calculated by the capacitive oil level sensor, and transmits the second oil level alarm information to the avionics system, which checks whether to send the second alarm information to the display for display.

[0053] Secondly, the oil level sensor 1 transmits the corresponding optical signal to the data processing module to demodulate the optical signal into liquid level discrete quantity information, and judges in its judgment unit whether to trigger the first oil level alarm information. The first oil level alarm information is transmitted to the avionics system, and the avionics system checks whether to send the first alarm information to the display for display.

[0054] Third, the oil level sensor 1 transmits the corresponding optical signal to the data processing module to demodulate the optical signal into liquid level discrete quantity information, and judges in its judgment unit whether to trigger the first oil level alarm information, and transmits it directly to the display through the newly added second link 20.

[0055] Specifically, the avionics system has a verification interface, and an alarm is generated when the definition verification interface receives the defined alarm information. The avionics system verifies the first oil level alarm information and the second oil level alarm information through the following operations: determining whether the data corresponding to the first oil level alarm information is consistent with the data corresponding to the defined alarm information. If they are consistent, the first oil level alarm information is transmitted to the display for display; and determining whether the data corresponding to the second oil level alarm information is consistent with the data corresponding to the defined alarm information. If they are consistent, the second oil level alarm information is transmitted to the display for display.

[0056] For example, it is pre-agreed that when the check interface receives GND (defined data corresponding to the alarm information), it indicates an alarm, and when the check interface receives OPEN (defined data corresponding to the non-alarm information), it indicates no alarm. Therefore, when the check interface receives the first oil level alarm information as GND, that is, the data corresponding to the first oil level alarm information is GND, which is consistent with the data GND corresponding to the defined alarm information, it indicates that the height of the oil level 101 in the oil tank 100 is too low, and the user needs to be alerted. The judgment logic is simple and easy to execute.

[0057] Similarly, it is defined that the verification interface does not give an alarm when receiving the defined non-alarm information, and it is determined whether the data corresponding to the first oil level alarm information is consistent with the data corresponding to the defined non-alarm information. If they are consistent, the display does not display the alarm content; if they are inconsistent, the display displays the alarm content or determines that the first oil level alarm information is invalid data. It is determined whether the data corresponding to the second oil level alarm information is consistent with the data corresponding to the defined non-alarm information. If they are consistent, the display does not display the alarm content; if they are inconsistent, the display displays the alarm content or determines that the second oil level alarm information is invalid data.

[0058] Reference Figure 4 In some embodiments of the present application, the display is configured to determine whether to receive the first oil level warning information through the second link by the following operations: determine whether the display receives the first oil level warning information or the second oil level warning information after verification by the avionics system; if not, receive the first oil level warning information through the second link. The second link is independent of the avionics system to transmit the first oil level warning information directly to the display without passing through the avionics system, and is enabled when the display does not receive the first oil level warning information or the second oil level warning information after verification by the avionics system, at which time it is considered that a common mode failure of the avionics system may occur. In this way, it is possible to reduce the situation where the display cannot display a low oil level warning when a common mode failure occurs in the avionics system, thereby avoiding the common mode failure of the avionics system and reducing the triggering of Class I failure.

[0059] It is understandable that if the display receives the first oil level warning information or the second oil level warning information after verification by the avionics system, the display is used to display the verified first oil level warning information or the second oil level warning information.

[0060] Continue to refer to Figure 2 The oil level sensor 1 further comprises an optical fiber 11, a diaphragm 12, at least one pair of sleeves 13 and a packaging structure 14. The packaging structure 14 is arranged in the oil tank 100, and a window communicating with the internal space thereof is provided on the top of the packaging structure 14, that is, the window penetrates the top wall of the packaging structure 14 along the third direction Z (the height direction of the oil tank 100) of the oil tank 100, and the top wall of the packaging structure 14 is the side wall of the packaging structure 14 facing the top of the oil tank 100. The diaphragm 12 is sealedly connected to the window, at least one pair of sleeves 13 are provided on the packaging structure 14 to connect the inside of the packaging structure 14 and the outside of the oil tank 100, and the two ends of the optical fiber 11 are respectively passed through at least one pair of sleeves 13 to extend out of the oil tank 100. Among them, the optical fiber 11 has a Bragg grating, and the diaphragm 12 deforms in response to the height change of the oil level 101 in the oil tank 100, so that the Bragg grating of the optical fiber 11 undergoes wavelength shift. Specifically, when the optical fiber 11 is affected by external physical or environmental parameters, the change in its refractive index will cause the reflection or transmission wavelength of the Bragg grating to shift. This displacement has a certain relationship with the deformation of the diaphragm 12. By measuring or monitoring the wavelength displacement of the fiber Bragg grating, the change in the pressure of the diaphragm 12 on the optical fiber 11 can be reflected, and then the height change of the oil level 101 can be reflected.

[0061] For example, Figure 2 As shown, the optical fiber 11 is arranged horizontally in the packaging structure 14, that is, perpendicular to the third direction Z. Based on this embodiment, in order to realize the force transmission between the diaphragm 12 and the optical fiber 11, the oil level sensor 1 further includes a force transmission member 15, which hard or rigidly connects the diaphragm 12 and the optical fiber 11 in the height direction of the oil tank 100, so that the pressure change of the diaphragm 12 can be transmitted to the optical fiber 11 through the force transmission member 15. In other words, a hard or rigid contact path needs to be established between the diaphragm 12 and the optical fiber 11, so that the pressure on the diaphragm 12 is indirectly transmitted to the optical fiber 11. Alternatively, the diaphragm 12 and the optical fiber 11 are in contact, so that the pressure on the diaphragm 12 is directly transmitted to the optical fiber 11.

[0062] Or, if Figure 5As shown, the optical fiber 11 comprises a first section, a second section and a third section connected end to end in sequence. The second section of the optical fiber 11 is arranged vertically in the packaging structure 14, that is, parallel to the third direction Z. The top of the second section of the optical fiber 11 is connected to the diaphragm 12, and the bottom of the second section of the optical fiber 11 is connected to the bottom of the packaging structure 14. The first section and the third section of the optical fiber 11 are respectively inserted into at least one pair of sleeves 13 to extend out of the oil tank 100. The second section of the optical fiber 11 is provided with a Bragg grating, and the diaphragm 12 is deformed in response to the height change of the oil level 101 in the oil tank 100, so that the Bragg grating of the optical fiber 11 undergoes wavelength shift.

[0063] By way of example, the at least one pair of sleeves 13 are respectively disposed on two opposite sides of the packaging structure 14 .

[0064] The present application continuously monitors the oil level information of the oil tank 100 through the optical fiber 11, and its sensitivity is higher than that of the capacitive oil level sensor 1. Among them, the optical fiber 11 is arranged in a sealed packaging structure 14, which can effectively prevent the external environment from interfering with the optical fiber oil level sensor 1, and can also prevent electromagnetic interference from affecting the performance of the optical fiber oil level sensor 1. The sleeve 13 connects the inside of the packaging structure 14 and the outside of the oil tank 100, which facilitates the connection between the two ends of the optical fiber 11 after passing through the sleeve 13 and passing through the outside of the oil tank 100 to other components. The sleeve 13 can protect the part of the optical fiber 11 located between the packaging structure 14 and the oil tank 100 from the oil in the oil tank 100.

[0065] In addition, in order to meet the requirements of ignition source and electromagnetic shielding, the measuring cable of the capacitive oil level sensor 1 usually has a thick shielding layer, and the measuring cable is heavy. The optical fiber oil level sensor 1 has excellent anti-electromagnetic interference characteristics, can reduce connecting wires, and can achieve weight reduction and carbon emission reduction to a certain extent.

[0066] The data processing module calculates the oil level information according to the following calculation formula, and the oil level information is the oil level height H:

[0067]

[0068] Among them, Δλ B is the wavelength shift of the fiber Bragg grating caused by the deformation of the diaphragm 12 on the optical fiber 11;

[0069] ρ is the density of the oil in the oil tank 100;

[0070] g is the acceleration due to gravity;

[0071] k is a constant of the size of the diaphragm 12, the material properties and the central wavelength of the grating.

[0072] It should be noted that the oil level height H value is the discrete quantity information of the liquid level.

[0073] In order to ensure that the oil level sensor 1 can still maintain its performance when there is too much oil leakage and reduce false alarm triggering, the fuel tank 100 has a first direction X and a second direction Y that are perpendicular to its height direction and intersect each other. In the first direction X and the second direction Y, the oil level sensor 1 is located in the middle of the fuel tank 100 and is arranged close to the bottom of the fuel tank 100 to reduce the influence of fuel sloshing on the alarm triggering. Figure 6 As shown. The height direction of the oil tank 100 is the third direction Z shown in the figure. In some embodiments, the oil level sensor 1 is arranged closer to the bottom of the oil tank 100 than the oil quantity sensor.

[0074] Reference Figure 7 In some embodiments of the present application, the oil level sensor 1 includes a diaphragm 12, a packaging structure 14 disposed in the oil tank 100, and at least two optical fibers 11 packaged in the packaging structure 14; wherein both ends of each optical fiber 11 extend out of the packaging structure 14 and the oil tank 100, a window is provided on the top of the packaging structure 14, and the diaphragm 12 is sealed and connected to the window, and the diaphragm 12 can deform in response to the height change of the oil level in the oil tank 100, so that all the optical fibers 11 undergo fiber Bragg grating wavelength shift, thereby preventing the remaining optical fibers 11 from being able to work normally when one of the optical fibers 11 fails. For example, Figure 7 Only two optical fibers 11 are shown, but there may be more. A sleeve 13 is sleeved around the outer periphery of the portion of each optical fiber 11 between the packaging structure 14 and the oil tank 100, and each sleeve 13 is used to connect the inside of the packaging structure 14 and the outside of the oil tank 100. Each optical fiber 11 can independently measure the level change of the oil in the oil tank 100, improve confidence and availability, reduce the risk of single point failure, and reduce false alarms to a certain extent.

[0075] Of course, at least two windows may be provided on the packaging structure 14 , each of which is connected to a membrane 12 , and a corresponding optical fiber 11 is provided below each membrane 12 .

[0076] like Figure 8 As shown, there are at least two oil level sensors 1, and two adjacent oil level sensors 1 are arranged at intervals. The number of channels of the data processing module is equal to the number of optical fibers contained in all the oil level sensors 1, and each optical fiber 11 is coupled to a corresponding channel to improve the reliability of the fuel measurement system. Moreover, even if one set of oil level sensors 1 or channels is interfered with or attacked, the other set of oil level sensors 1 can continue to monitor the low oil level and give an alarm in time, thereby providing a safer fuel measurement system to reduce the risk of accidents and potential threats.

[0077] In some embodiments of the present application, the present application further provides a control method for a fuel measurement system, the control method is executed via the fuel measurement system, the fuel measurement system includes a fuel quantity sensor and a fuel level sensor 1 arranged in a fuel tank, the fuel level sensor 1 includes an optical fiber 11 arranged in the fuel tank, and the optical fiber 11 has a first end 111 and a second end 112 extending out of the fuel tank. Fig. 9 As shown, the control method includes: obtaining the oil quantity information of the oil in the oil tank 100; optically connecting the first end 111 of the optical fiber 11 to the light source, the optical fiber responds to the height change of the oil level in the oil tank 100, and outputs an optical signal corresponding to the height of the oil level through the second end 112; demodulating the optical signal to obtain the oil level information of the oil tank 100, and judging whether to trigger the first oil level alarm information according to the oil level information; judging whether to trigger the second oil level alarm information according to the oil level information and the oil quantity information, and displaying the first oil level alarm information or the second oil level alarm information through the display.

[0078] In this technical solution, the oil level sensor 1 includes an optical fiber 11 disposed in the oil tank 100. The optical fiber 11 in the oil level sensor 1 can respond to the height change of the oil level 101 in the oil tank 100, output an optical signal corresponding to the height of the oil level 101, and demodulate the optical signal through the data processing module to obtain the oil level information. The oil level sensor 1 adopts a non-capacitive sensor structure, which is independent and non-similar to the capacitive oil quantity sensor, and the optical fiber 11 has excellent anti-electromagnetic interference characteristics to reduce the problem of common mode failure of the fuel measurement system. In addition, the display of the present application can display the first oil level warning information or the second oil level warning information through different coupling paths to further reduce common mode failure.

[0079] The oil level information includes digital information of the liquid level, and judging whether to trigger the second oil level alarm information according to the oil level information and the oil quantity information includes: if the digital information of the liquid level is less than or equal to the first preset threshold value and lasts for the first preset time, or if the oil quantity information is less than or equal to the second preset threshold value and lasts for the second preset time, then confirming that the second oil level alarm information is triggered. Thus, by comparing the preset threshold value and the duration dual path to judge whether to trigger the second oil level alarm information, the accuracy of the judgment is increased, and the problem of false alarm or missed alarm caused by single path judgment is avoided.

[0080] In addition, the oil level information includes liquid level discrete quantity information, and judging whether to trigger the first oil level alarm information according to the oil level information includes: judging whether to trigger the first oil level alarm information according to the liquid level discrete quantity information. Among them, the control method includes: verifying the first oil level alarm information and the second oil level alarm information, and transmitting the verified first oil level alarm information and the second oil level alarm information to the display; judging whether the display receives the verified first oil level alarm information or the second oil level alarm information; if not, receiving and displaying the first oil level alarm information. The present application is enabled when the display fails to receive the first oil level alarm information or the second oil level alarm information verified by the avionics system, and at this time, it is considered that a common mode failure of the avionics system may occur. As a result, the situation where the display cannot display a low oil level alarm when a common mode failure occurs in the avionics system can be reduced, thereby avoiding the common mode failure of the avionics system and further reducing the triggering of Class I failure.

[0081] In some embodiments of the present application, the present application further provides an aircraft, including the fuel measurement system described in any of the above technical solutions, and the fuel tank is configured as a wing fuel tank of the aircraft. The wing fuel tank of the aircraft includes a left wing fuel tank and a right wing fuel tank. Since the fuel measurement system in the aircraft of the present application has the same structure as the fuel measurement system described in any of the above technical solutions, the two can solve the same technical problems and achieve the same technical effects.

[0082] It should be noted that the left wing fuel tank and the right wing fuel tank are both provided with ribs 102 to separate the corresponding wing fuel tanks, and oil holes are provided on the ribs 102. If a wing fuel tank of the aircraft includes at least two oil level sensors, at least one oil level sensor is provided on both sides of the rib 102 in the thickness direction thereof.

[0083] like Figure 1 As shown, the left wing fuel tank and the right wing fuel tank of the aircraft each have their own corresponding and matching fuel measurement systems, and the common parts of the two include a fuel computer and an avionics system. The avionics system has more than two data interfaces, and the fuel computer includes two channels and two remote data concentration units correspondingly coupled to the two channels. Among them, the two remote data concentration units are respectively coupled to the fuel quantity sensors in the corresponding wing fuel tanks, and the two remote data concentration units are correspondingly coupled to the two data interfaces of the avionics system through the corresponding channels. The remote data concentration unit is used to receive the capacitance value analog quantity of the fuel quantity sensor coupled thereto, and convert the capacitance value analog quantity into a digital quantity, which is transmitted to the fuel computer for further calculation to obtain the corresponding fuel quantity value in the wing fuel tank.

[0084] In addition, the left wing fuel tank and the right wing fuel tank of the aircraft each have their own corresponding data processing modules, the two data processing modules are respectively coupled to the two channels of the fuel computer through the corresponding first link 10, the two data processing modules are coupled to the display through the corresponding second link 20, and the two data processing modules are coupled to the two data interfaces of the avionics system through the corresponding third link 30.

[0085] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0086] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims. In addition, the specification uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and its core idea of ​​the present application. The content of this specification should not be understood as a limitation on the present application.

Claims

1. A fuel measurement system, characterized in that: include: An oil level sensor is disposed in the oil tank and is used to collect oil level information of the oil in the oil tank; An oil level sensor, comprising an optical fiber disposed in the oil tank, both ends of the optical fiber extending out of the oil tank, the optical fiber responding to a height change of the oil level in the oil tank, one end of the optical fiber being optically connected to a light source, and the other end outputting an optical signal corresponding to the height of the oil level; a data processing module configured to receive and demodulate the optical signal to obtain the oil level information of the oil tank, and determine whether to trigger the first oil level alarm information based on the oil level information; a fuel computer, coupled to the fuel level sensor and coupled to the data processing module via a first link, and determining whether to trigger second fuel level warning information based on the fuel level information and the fuel level information; The display is configured to receive and display the first oil level warning information or receive and display the second oil level warning information through a second link.

2. The fuel measurement system according to claim 1, characterized in that: The oil level information includes liquid level digital quantity information and liquid level discrete quantity information. The data processing module is configured to determine whether to trigger the first oil level alarm information based on the liquid level discrete quantity information. The fuel computer determines whether to trigger the second oil level alarm information based on the received liquid level digital quantity information and the oil quantity information.

3. The fuel measurement system according to claim 2, characterized in that: The fuel computer is configured to determine whether to trigger the second fuel level warning information by the following operations: If the liquid level digital quantity information is less than or equal to a first preset threshold and lasts for a first preset time period, or if the oil quantity information is less than or equal to a second preset threshold and lasts for a second preset time period, the fuel computer triggers the second oil level alarm information.

4. The fuel measurement system according to claim 2, characterized in that: Also includes: an avionics system, wherein a data interface of the avionics system is coupled to the fuel computer and is coupled to the data processing module via a third link, and the avionics system is coupled to the display; The avionics system is configured to receive and verify whether to send the first oil level warning information and to verify whether to send the second oil level warning information to the display for display.

5. The fuel measurement system according to claim 4, characterized in that: The avionics system has a verification interface, and it is defined that the verification interface will give an alarm when receiving the defined alarm information. The avionics system verifies the first oil level alarm information and the second oil level alarm information by the following operations: Determining whether the data corresponding to the first oil level warning information is consistent with the data corresponding to the defined warning information, and if they are consistent, transmitting the first oil level warning information to the display for display; It is determined whether the data corresponding to the second oil level warning information is consistent with the data corresponding to the defined warning information. If they are consistent, the second oil level warning information is transmitted to the display for display.

6. The fuel measurement system according to claim 4, characterized in that: The display is configured to determine whether the first oil level warning information is received through the second link by: determining whether the display receives the first oil level warning information or the second oil level warning information after verification by the avionics system; If not, the first oil level alarm information is received through the second link.

7. The fuel measurement system according to claim 1, characterized in that: The oil level sensor also includes a diaphragm, at least one pair of sleeves and a packaging structure. The packaging structure is arranged in the oil tank and has a window on the top. The diaphragm is sealed and connected to the window. At least one pair of sleeves are arranged on the packaging structure to connect the inside of the packaging structure and the outside of the oil tank. The two ends of the optical fiber are respectively passed through at least one pair of sleeves to extend out of the oil tank. The optical fiber has a Bragg grating, and the diaphragm can deform in response to the height change of the oil level in the oil tank to cause the Bragg grating to shift in wavelength.

8. The fuel measurement system according to claim 1, characterized in that: The oil tank has a first direction and a second direction which are perpendicular to its height direction and intersect each other. In the first direction and the second direction, the oil level sensor is located in the middle of the oil tank and is arranged close to the bottom of the oil tank.

9. The fuel measurement system according to claim 1, characterized in that: The oil level sensor includes a diaphragm, a packaging structure arranged in the oil tank, and at least two optical fibers packaged in the packaging structure; wherein both ends of each of the optical fibers extend out of the oil tank through the packaging structure, each of the optical fibers has a Bragg grating, a window is provided on the top of the packaging structure, the diaphragm is sealed and connected to the window, and the diaphragm can deform in response to the height change of the oil level in the oil tank, so that all the Bragg gratings undergo wavelength shift.

10. The fuel measurement system according to claim 1, 8 or 9, wherein there are at least two oil level sensors, and two adjacent oil level sensors are arranged at intervals, the number of channels of the data processing module is equal to the number of optical fibers contained in all the oil level sensors, and each optical fiber is coupled to a corresponding channel.

11. A method for controlling a fuel measurement system, characterized in that: The control method is performed via a fuel measurement system, the fuel measurement system comprising a display, a fuel quantity sensor and a fuel level sensor disposed in a fuel tank, the fuel level sensor comprising an optical fiber disposed in the fuel tank, both ends of the optical fiber extending out of the fuel tank, the optical fiber responding to a height change of the oil level in the fuel tank, the control method comprising: Obtaining the oil quantity information of the oil in the oil tank; One end of the optical fiber is optically connected to a light source, and the other end outputs an optical signal corresponding to the height of the oil level; Demodulating the optical signal to obtain oil level information of the oil tank, and determining whether to trigger first oil level alarm information according to the oil level information; Determining whether to trigger a second oil level warning message according to the oil level information and the oil quantity information; The first oil level warning information or the second oil level warning information is displayed through the display.

12. The control method according to claim 11, characterized in that: The oil level information includes digital information of the oil level, and judging whether to trigger the second oil level alarm information according to the oil level information and the oil quantity information includes: If the liquid level digital quantity information is less than or equal to the first preset threshold and lasts for a first preset time, or if the oil quantity information is less than or equal to the second preset threshold and lasts for a second preset time, it is confirmed that the second oil level alarm information is triggered.

13. The control method according to claim 12, characterized in that: The oil level information includes liquid level discrete quantity information, and judging whether to trigger the first oil level alarm information according to the oil level information includes: judging whether to trigger the first oil level alarm information according to the liquid level discrete quantity information; Wherein, the control method comprises: Verifying the first oil level warning information and the second oil level warning information, and transmitting the verified first oil level warning information and the second oil level warning information to the display; Determine whether the display has received the verified first oil level warning information or the second oil level warning information; if not, receive and display the first oil level warning information.

14. An aircraft, characterized in that: The fuel measuring system comprises the fuel measuring system according to claims 1 to 10, wherein the fuel tank is configured as a wing fuel tank of the aircraft.

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