An Electronic Temperature Compensation Device and Method for Fuel Metering of Aero-engines

Abstract

The present invention relates to the field of aero-engine control technology, and more specifically, to an electronic temperature compensation device and method for fuel metering of an aero-engine. The electronic temperature compensation device for fuel metering of an aero-engine provided by the present invention includes an engine electronic controller, a metering valve, and a fuel temperature sensor: the fuel temperature sensor collects the fuel temperature and feeds it back to the engine electronic controller; the engine electronic controller compensates and controls the fuel mass flow of the metering valve according to the obtained fuel temperature by using a fuel medium temperature compensation table; wherein, the fuel medium temperature compensation table is a corresponding relationship table of fuel mass flow values under different fuel medium types, fuel temperatures, and metering valve openings pre-calibrated. The present invention ensures a constant fuel mass flow for metering at different temperatures through a pre-set temperature compensation table for different fuel media, and has a wide application range, strong changeability, and high reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of aero-engine control, and more specifically, to an aero-engine fuel metering electronic temperature compensation device and method. Background Art

[0002] The aero-engine fuel system is an important part of the FADEC (Full Authority Digital Electronic Control) system, mainly including a fuel pump, a fuel metering device, a fuel distribution device, and various actuating components, etc.

[0003] Modern aero-engine fuel systems are developing towards higher flow rates, higher pressures, and higher metering accuracies. Fuel control technology refers to supplying a certain mass flow rate of fuel to the combustion chamber according to the needs of the engine. Aero-engines require precise control of the fuel flow rate to maintain a stable mass flow rate.

[0004] Currently, most aero-engines adopt a constant pressure difference return oil type fuel metering device. Figure 1 The schematic diagram of the fuel metering device of the prior art is disclosed, as Figure 1 shown in the fuel metering device 100. Through the combined action of the pressure difference valve 103 and the return oil valve 104, the fuel pressure before and after metering is maintained at a stable difference, so that the metered fuel flow rate is proportional to the flow area of the metering valve 102. Then, by closing the loop to control the opening of the metering valve, the fuel metering function is realized.

[0005] The calculation of the opening of the metering valve is carried out by the engine electronic controller 107 (EEC, Engine Electronic Controller) according to the current engine speed error, calculating the required metered fuel mass flow rate, and then interpolating the opening value of the metering valve through the calibration table of the metered fuel mass flow rate and the opening of the metering valve.

[0006] When the electro-hydraulic servo valve 101 receives the instruction from the engine electronic controller 107, it controls the metering valve 102 to open a certain opening. The resolver 105 feeds back the opening of the metering valve 102 to the engine electronic controller 107. When the fuel pressure behind the metering valve 102 reaches the opening pressure of the high-pressure shut-off valve 106, the high-pressure shut-off valve 106 opens to achieve closed-loop control.

[0007] Figure 2 The schematic diagram of the EEC control logic of the fuel metering circuit of the prior art is disclosed. In the Figure 1 shown embodiment, as Figure 2 shown, the current fuel metering algorithm logic is as follows:

[0008] The engine electronic controller 107 calculates the commanded value of the metered fuel mass flow rate Wf_Dem based on the error between the commanded value N1_Dem of the low-pressure rotor speed and the actual N1 value.

[0009] The engine electronic controller 107 interpolates and calculates the commanded value of the metering valve opening Lfmv_Dem corresponding to the commanded value of the metered fuel mass flow rate Wf_Dem through the fuel flow calibration table corresponding to the fuel metering device, that is, the interpolation table of the metering valve opening and the metered fuel flow rate.

[0010] The resolver 105 feeds back the actual opening Lfmv_Lead of the metering valve to the engine electronic controller 107.

[0011] The engine electronic controller 107 calculates the position error of the metering valve 102.

[0012] The fmv (Fuel Metering Valve) servo loop controller 108 calculates the fmv control current signal based on the position error.

[0013] The electro-hydraulic servo valve 101 receives the fmv control current signal and outputs a certain flow rate of servo fuel to the control chamber of the metering valve 102 to drive the metering valve 102 to move to the desired position.

[0014] The metering valve is designed with metering orifices, and its structure is a thin-walled orifice structure.

[0015] Figure 3 Reveals the structural schematic diagram of the thin-walled orifice in the prior art, as Figure 3 shown, the volume flow formula is:

[0016]

[0017] Among them, q is the volume flow rate flowing through the orifice, C d is the flow coefficient of the orifice, A is the flow area of the orifice, ΔP is the pressure difference across the orifice, ρ is the fuel density, d is the orifice diameter, and L is the thickness of the orifice thin wall.

[0018] It can be seen that q = f(C d , A, ΔP, ρ). Under the condition of the same metering orifice and relatively stable fuel temperature, it can be considered that C d , ρ are constants. When the pressure difference ΔP across the metering orifice is constant, the flow rate is only related to the flow area A, and the metering flow rate can be controlled by controlling the opening of the metering valve.

[0019] Aero-engines often operate in various harsh environments, and the temperature range of the fuel oil in the fuel tank varies greatly. Inside the engine, as an important heat sink medium, the fuel needs to receive heat transfer from the lubricating oil. The working environment of the engine is usually relatively harsh. During the entire working cycle, considering the influence of internal and external factors, the fuel temperature changes within a large range. Currently, the allowable medium temperature of aero-engines is approximately between -50°C and 150°C. The change in fuel temperature leads to changes in parameters such as density and viscosity, resulting in errors in the measured fuel mass flow rate, affecting the measurement accuracy, and having an adverse impact on the operation of the engine. Therefore, it is necessary to perform temperature compensation on the measured fuel to keep the measured fuel mass flow rate constant.

[0020] For the currently widely used constant differential pressure return oil type fuel metering device, the engine mainly adopts a mechanical temperature compensation device to compensate the measured fuel and ensure the measurement accuracy. For example, a temperature compensation piece is added to the differential pressure valve of the fuel metering device. When the fuel temperature rises, the temperature compensation piece expands, which is equivalent to increasing the spring stiffness, and then increases the control differential pressure of the differential pressure valve to keep the measured fuel mass flow rate constant.

[0021] Chinese Patent Application No. 201611052249.2 discloses "a new fuel temperature compensation method", in which a temperature compensation rod is installed inside the metering valve. The change in temperature causes the axial length of the compensation rod to change, and the change amount is transmitted to the displacement sensor, and then the opening of the metering valve is adjusted.

[0022] Figure 4 Reveals the structural schematic diagram of the differential pressure valve of the prior art, as Figure 4 shown in the differential pressure valve, including a temperature compensation piece 401, P1 is the pressure before metering, P2 is the pressure after metering, Psf is the servo pressure, and at steady state, the differential pressure force between P1 and P2 is balanced with the spring force.

[0023] When the fuel temperature rises, the spring stiffness will decrease, then the control differential pressure of the differential pressure valve will decrease, resulting in a decrease in the metering flow rate. At the same time, the increase in fuel temperature will also lead to a decrease in density and viscosity, which will also cause a decrease in the measured fuel mass flow rate and affect the fuel metering accuracy. The temperature compensation piece 401 will expand when heated, and then compress the spring, increasing the spring force, compensating for the lost differential pressure to a certain extent, and realizing the temperature compensation of the measured fuel.

[0024] The common problems of mechanical temperature compensation devices are low accuracy, low reliability, poor changeability, making the product complex, not considering the characteristic differences of different fuel media, and it is difficult to balance high and low temperatures, with unstable compensation characteristics and unable to achieve precise compensation within the full temperature range, etc.

[0025] Taking the example of adding a temperature compensation piece to the differential pressure valve of a constant differential pressure return oil type fuel metering device, this method has many deficiencies, specifically including but not limited to the following three points:

[0026] 1) The compensation accuracy is poor. Generally, it is verified through experiments whether the temperature compensation piece plays a certain compensation role, and accurate compensation cannot be achieved.

[0027] 2) The compensation range is limited. The low-temperature and high-temperature characteristics of the temperature compensation piece are different, and it is impossible to take into account both low temperature and high temperature, resulting in different fuel temperature compensation characteristics of the engine under different operating environments. In actual engine tests, there has been a situation where the metering valve temperature compensation component overcompensated, resulting in insufficient starting fuel supply and failure of low-temperature starting.

[0028] 3) The reliability of the temperature compensation piece is poor. As the engine operates, the performance of the temperature compensation piece begins to decline, resulting in unstable fuel temperature compensation characteristics. Summary of the Invention

[0029] The purpose of the present invention is to provide an aviation engine fuel metering electronic temperature compensation device and method to solve the problem of metering error of metered fuel due to fuel temperature change in the prior art.

[0030] To achieve the above purpose, the present invention provides an aviation engine fuel metering electronic temperature compensation device, including an engine electronic controller, a metering valve, and a fuel temperature sensor:

[0031] The fuel temperature sensor collects the fuel temperature and feeds it back to the engine electronic controller.

[0032] The engine electronic controller compensates and controls the fuel mass flow of the metering valve according to the obtained fuel temperature by using a fuel medium temperature compensation table.

[0033] Among them, the fuel medium temperature compensation table is a corresponding relationship table of fuel mass flow values under different fuel medium types, fuel temperatures, and metering valve openings pre-calibrated.

[0034] In one embodiment, the fuel medium temperature compensation table is obtained through the following method:

[0035] For a certain type of fuel medium, according to the control variable method, measure the fuel mass flow values at different fuel temperatures and different metering valve openings.

[0036] Replace the fuel medium and repeat the above steps to obtain the temperature compensation table corresponding to each fuel medium.

[0037] In one embodiment, the aviation engine fuel metering electronic temperature compensation device further includes a high-pressure shut-off valve:

[0038] The temperature sensor is installed at the input position of the metering valve in the engine fuel system or the output position of the high-pressure shut-off valve to collect the fuel temperature.

[0039] In one embodiment, the engine electronic controller calculates the fuel mass flow command value Wf_Dem according to the difference between the command value N1_Dem of the low-pressure rotor speed and the actual low-pressure rotor speed N1 value.

[0040] The engine electronic controller calculates the metering valve opening command value Lfmv_Dem by using the fuel medium temperature compensation table, based on the fuel medium signal and the fuel temperature signal of the fuel currently used by the engine, in combination with the fuel mass flow command value Wf_Dem.

[0041] In one embodiment, the aircraft engine fuel metering electronic temperature compensation device further includes a resolver, a fuel metering valve servo loop controller, and an electro-hydraulic servo valve:

[0042] The engine electronic controller receives the actual opening Lfmv_Lead of the metering valve fed back by the resolver, compares it with the metering valve opening command value Lfmv_Dem, and obtains the position error of the metering valve.

[0043] The fuel metering valve servo loop controller calculates the fuel metering valve control current according to the position error of the metering valve.

[0044] The electro-hydraulic servo valve receives the fuel metering valve control current signal, outputs a certain flow of servo fuel to the metering valve control chamber, and pushes the metering valve to move to the desired position, so as to realize the compensation control of the metered fuel mass flow.

[0045] To achieve the above object, the present invention provides an aircraft engine fuel metering electronic temperature compensation method, including the following steps:

[0046] Step S1: Collect the fuel temperature and feedback it to the engine electronic controller;

[0047] Step S2: The engine electronic controller compensates and controls the metered fuel mass flow by using the fuel medium temperature compensation table according to the obtained fuel temperature. The fuel medium temperature compensation table is a corresponding relationship table of fuel mass flow values under different fuel medium types, fuel temperatures, and metering valve openings calibrated in advance.

[0048] In one embodiment, the fuel medium temperature compensation table is obtained by the following method:

[0049] For a certain fuel medium, according to the control variable method, measure the fuel mass flow values at different fuel temperatures and different metering valve openings;

[0050] Replace the fuel medium and repeat the above steps to obtain the temperature compensation table corresponding to each fuel medium.

[0051] In one embodiment, the fuel temperature collected in step S1 is obtained in the following manner:

[0052] Install a fuel temperature sensor at the input position of the metering valve in the engine fuel system or the output position of the high-pressure shut-off valve, and collect the fuel temperature through the fuel temperature sensor.

[0053] In one embodiment, step S2 further includes:

[0054] The engine electronic controller calculates the fuel mass flow command value Wf_Dem according to the difference between the command value N1_Dem of the low-pressure rotor speed and the actual low-pressure rotor speed N1 value.

[0055] The engine electronic controller calculates the metering valve opening command value Lfmv_Dem by using the fuel medium temperature compensation table in combination with the fuel mass flow command value Wf_Dem according to the fuel medium signal and fuel temperature signal of the fuel currently used by the engine.

[0056] In one embodiment, step S2 further includes:

[0057] The engine electronic controller receives the actual opening Lfmv_Lead of the metering valve fed back by the resolver, compares it with the metering valve opening command value Lfmv_Dem, and obtains the position error of the metering valve.

[0058] The fuel metering valve servo loop controller calculates the fuel metering valve control current according to the position error of the metering valve.

[0059] The electro-hydraulic servo valve receives the fuel metering valve control current signal, outputs a certain flow of servo fuel to the metering valve control chamber, and pushes the metering valve to move to the desired position to achieve compensation control of the metered fuel mass flow.

[0060] A fuel metering electronic temperature compensation device and method provided by the present invention consider the influence of temperature when the EEC calculates the metering valve opening, ensure that the metered fuel mass flow is constant at different temperatures, can be applied to a variety of fuel media through a pre-set temperature compensation table for different fuel media, has a wide application range, strong changeability, can ensure fuel metering accuracy, simplifies the design of accessories to a certain extent, and has good reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] The above and other features, properties, and advantages of the present invention will become more apparent from the following description in conjunction with the drawings and embodiments, where the same reference numerals in the drawings always represent the same features, and among them:

[0062] Figure 1 Discloses the schematic diagram of the fuel metering device of the prior art;

[0063] Figure 2 Reveals a schematic diagram of the fuel metering circuit EEC control logic of the prior art;

[0064] Figure 3 Reveals a schematic diagram of the structure of a thin-walled small hole of the prior art;

[0065] Figure 4 Reveals a schematic diagram of the structure principle of a differential pressure valve of the prior art;

[0066] Figure 5 Reveals a schematic diagram of the principle of a fuel metering electronic temperature compensation device according to an embodiment of the present invention;

[0067] Figure 6 Reveals a schematic diagram of the fuel metering circuit EEC control logic including temperature compensation according to an embodiment of the present invention;

[0068] Figure 7 Reveals a flowchart of a fuel metering electronic temperature compensation method according to an embodiment of the present invention;

[0069] Figure 8 Reveals a detailed flowchart of a fuel metering electronic temperature compensation method according to an embodiment of the present invention.

[0070] The meanings of the reference numerals in the figure are as follows:

[0071] 100 Fuel metering device;

[0072] 101 Electro-hydraulic servo valve;

[0073] 102 Metering valve;

[0074] 103 Differential pressure valve;

[0075] 104 Return oil valve;

[0076] 105 Resolver;

[0077] 106 High-pressure shut-off valve;

[0078] 107 Engine electronic controller;

[0079] 108 fmv servo loop controller;

[0080] 401 Temperature compensation piece;

[0081] 500 Fuel metering device;

[0082] 501 Electro-hydraulic servo valve;

[0083] 502 Metering valve;

[0084] 503 Pressure differential valve;

[0085] 504 Return oil valve;

[0086] 505 Solver;

[0087] 506 High-pressure shut-off valve;

[0088] 507 Servo fuel heater;

[0089] 508 Engine electronic controller;

[0090] 509 Fuel temperature sensor;

[0091] 510 FMV servo loop controller. Detailed implementation mode

[0092] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the invention and are not used to limit the invention.

[0093] The present invention provides a fuel metering electronic temperature compensation device and method. A fuel temperature sensor is installed in the fuel system or the existing fuel temperature sensor in the fuel system is directly used. A fuel temperature sensor is installed near the metering valve in the engine fuel system:

[0094] The fuel temperature sensor collects the fuel temperature and feeds it back to the EEC;

[0095] The EEC calculates the metering valve opening command value Lfmv_Dem by interpolation using the fuel medium temperature compensation table according to the type of fuel medium used by the current engine, the metered fuel mass flow command value Wf_Dem and the fuel temperature, and performs temperature compensation closed-loop control to ensure that the metered fuel mass flow is constant at different temperatures.

[0096] The fuel medium temperature compensation table is obtained through the following method:

[0097] In the fuel metering characteristic test, for a certain type of fuel medium, according to the control variable method, the fuel mass flow values at different fuel temperatures and different metering valve openings are measured and made into a fuel medium temperature compensation table in tabular form.

[0098] Suppose there are N available fuel media, then N groups of fuel metering characteristic tests are carried out to obtain the temperature compensation table corresponding to each fuel medium.

[0099] There are many types of actual working fuel media for the engine, and the temperature rise characteristics of different working media are different. In the present invention, corresponding temperature compensation tables are generated through different interpolation tables for different media, enabling precise temperature compensation for the mass flow rate of metered fuel of different types.

[0100] Figure 5 Disclosed is a schematic diagram of an electronic temperature compensation device for fuel metering according to an embodiment of the present invention. As Figure 5 shown, an electronic temperature compensation device for fuel metering proposed by the present invention includes an electro-hydraulic servo valve 501, a metering valve 502, a differential pressure valve 503, a return oil valve 504, a resolver 505, a high-pressure shut-off valve 506, a servo fuel heater 507, an engine electronic controller 508, and a fuel temperature sensor 509.

[0101] Compared with the temperature compensation piece of the differential pressure valve in the prior art, a fuel temperature sensor 509 is installed at a position close to the metering valve 502 in the fuel system. The existing fuel temperature sensor can also be used. The fuel temperature sensor 509 feeds back the fuel temperature to the EEC for temperature compensation calculation.

[0102] The fuel temperature sensor 509 is installed at a position in the engine fuel system close to the fuel metering device and capable of characterizing the temperature characteristics of the metered fuel.

[0103] In this embodiment, by way of example, the fuel temperature sensor 509 is installed at the metered fuel output position after the high-pressure shut-off valve 506.

[0104] In other embodiments, the fuel temperature sensor 509 can be installed at the high-pressure oil input position after the fuel pump of the metering valve 502 or other positions close to the fuel metering components.

[0105] The differential pressure valve 503 and the return oil valve 504 act jointly to keep the differential pressure before and after the metering valve 502 constant, maintaining a stable difference in fuel pressure before and after metering, making the metered fuel flow rate proportional to the flow area of the metering valve 502. Then, the opening of the metering valve is controlled in a closed loop. When the fuel pressure after the metering valve 502 reaches the opening pressure of the high-pressure shut-off valve 506, the high-pressure shut-off valve 506 opens to achieve the fuel metering function.

[0106] When the electro-hydraulic servo valve 501 receives an instruction from the engine electronic controller 508, it controls the metering valve 502 to open a certain opening. The resolver 505 feeds back the opening of the metering valve 502 to the engine electronic controller 508 to achieve closed-loop control.

[0107] In the differential pressure valve 503, P1 is the pressure before metering, P2 is the pressure after metering, and Psf is the servo pressure.

[0108] The differential pressure valve 503 senses the differential pressure before and after the metering valve 502, and by controlling the opening degree of the oil return valve 504, adjusts the oil return amount to keep the pressure difference before and after the metering valve 502 fixed.

[0109] When the pressure before metering increases, the differential pressure valve 503 controls the opening degree of the oil return valve 504 to increase, that is, the oil return area increases, then the oil return amount increases, and the pressure before metering decreases accordingly;

[0110] When the pressure before metering decreases, the differential pressure valve 503 controls the opening degree of the oil return valve 504 to decrease, that is, the oil return area decreases, then the oil return amount decreases, and the pressure before metering increases accordingly.

[0111] The EEC control logic of the fuel metering circuit with temperature compensation proposed by the present invention is as Figure 6 shown, different from Figure 2 :

[0112] The engine electronic controller (EEC) 508 receives the fuel temperature signal collected by the fuel temperature sensor 509 and the fuel medium signal used by the engine;

[0113] The engine electronic controller (EEC) 508 calculates the metered fuel mass flow command value Wf_Dem according to the error between the command value N1_Dem of the low-pressure rotor speed and the actual N1 value;

[0114] The engine electronic controller (EEC) 508 finds the corresponding temperature compensation table according to the fuel medium signal used by the engine;

[0115] The engine electronic controller (EEC) 508 interpolates and calculates the metering valve opening command value Lfmv_Dem by using the temperature compensation table according to the two variables of fuel temperature and Wf_Dem;

[0116] The resolver 505 of the fuel metering device 500 feeds back the actual opening degree Lfmv_Lead of the metering valve 502 to the EEC;

[0117] The engine electronic controller (EEC) 508 calculates the position error of the metering valve 502;

[0118] The fmv servo loop controller 510 calculates the fmv control current according to the position error;

[0119] The electro-hydraulic servo valve 501 receives the fmv control current signal and outputs a certain flow of servo fuel to the control chamber of the metering valve 502 of the fuel metering device 500, pushing the metering valve 502 to move to the desired position to achieve fuel metering including fuel temperature compensation.

[0120] Figure 7Disclosed is a flowchart of an electronic temperature compensation method for fuel metering according to an embodiment of the present invention. As Figure 7 shown, an electronic temperature compensation method for fuel metering proposed by the present invention includes the following steps:

[0121] Step S1: Collect the fuel temperature and feedback it to the engine electronic controller;

[0122] Step S2: The engine electronic controller compensates and controls the metered fuel mass flow according to the obtained fuel temperature by using a fuel medium temperature compensation table, and the fuel medium temperature compensation table is a corresponding relationship table of fuel mass flow values under different fuel medium types, fuel temperatures, and metering valve openings pre-calibrated.

[0123] The fuel medium temperature compensation table is obtained through the following method:

[0124] For a certain type of fuel medium, according to the control variable method, measure the fuel mass flow values at different fuel temperatures and different metering valve openings;

[0125] Replace the fuel medium and repeat the above steps to obtain the temperature compensation table corresponding to each fuel medium.

[0126] Figure 8 Disclosed is a detailed flowchart of an electronic temperature compensation method for fuel metering according to an embodiment of the present invention. As Figure 8 shown, the electronic temperature compensation method for fuel metering specifically includes the following steps:

[0127] In the fuel metering characteristic test stage, for a certain type of fuel medium, according to the control variable method, measure the metered fuel mass flow at different fuel temperatures and different metering valve openings.

[0128] For example, set m fuel temperature values, which are T1, T2... Tm respectively;

[0129] Set j metering valve opening values, which are L1, L2... Lj respectively;

[0130] Adjust the fuel temperature to T1 and measure the fuel mass flow at the openings of metering valves L1, L2... Lj, thus generating j fuel mass flow values;

[0131] Adjust the fuel temperature to T2 and similarly measure the fuel mass flow at the openings of metering valves L1, L2... Lj, thus generating j fuel mass flow values;

[0132] Repeat the above steps for a total of m tests to generate m*j flow values;

[0133] Replace the fuel medium and measure the metered fuel mass flow rate at different fuel temperatures and different metering valve openings in the same way as described above.

[0134] Assume there are N available fuels and repeat the experiment N times.

[0135] Organize the obtained data into N tables, number each table, and the numbers correspond one-to-one with the types of fuel media, generate the corresponding fuel medium temperature compensation tables, and write the tables into the EEC calculation software;

[0136] The engine electronic controller (EEC) calculates the metered fuel mass flow rate command value Wf_Dem based on the rotational speed error between the command value N1_Dem of the low-pressure rotor speed and the actual N1 value.

[0137] The engine electronic controller (EEC) interpolates and calculates the valve opening command value Lfmv_Dem using the fuel medium temperature compensation table based on the fuel medium type signal, fuel temperature signal, and metered fuel mass flow rate command value Wf_Dem currently used by the engine.

[0138] The engine electronic controller receives the actual opening Lfmv_Lead of the metering valve fed back by the resolver, compares it with the metering valve opening command value Lfmv_Dem, and obtains the position error of the metering valve.

[0139] The fuel metering valve servo loop controller calculates the fuel metering valve control current based on the position error of the metering valve.

[0140] The electro-hydraulic servo valve receives the fuel metering valve control current signal, outputs a certain flow of servo fuel to the metering valve control chamber, controls the metering valve to open a certain opening, and the resolver feeds back the opening to the engine electronic controller (EEC). The closed-loop controls the opening of the metering valve, drives the metering valve to move to the desired position, realizes the compensation control of the metered fuel mass flow rate, and completes the fuel metering including fuel temperature compensation.

[0141] Regarding the problems of the existing constant differential pressure return fuel metering device, such as complex structure, many parts, and high reliability requirements, the fuel metering electronic temperature compensation device and method provided by the present invention cancel the temperature compensation piece design of the differential pressure valve of the fuel metering device, reduce the number of parts of the components, simplify the structural complexity of the fuel metering system, and achieve precise compensation of the metered fuel flow rate within the full temperature range of the engine through electronic temperature compensation, taking into account both low-temperature and high-temperature characteristics.

[0142] The fuel metering electronic temperature compensation device and method provided by the present invention specifically have the following beneficial effects:

[0143] 1) The mechanical temperature compensation device is cancelled, making the fuel metering device simpler and more reliable;

[0144] 2) The different temperature rise characteristics of different fuel media are fully considered, and the variable of the fuel media type is introduced. By customizing the temperature compensation table for each fuel media, the fuel metering accuracy is effectively improved;

[0145] 3) By introducing the variable of fuel temperature, accurate temperature compensation of fuel flow within the full temperature range can be achieved, effectively improving the fuel metering accuracy;

[0146] 4) The electronic temperature compensation method can provide stable metering fuel temperature compensation during the engine working cycle, and there is no problem of mechanical device performance degradation;

[0147] 5) The influence of fuel temperature on the metering characteristics of the metering device is fully considered, especially the influence of fuel temperature on the control pressure difference of the differential pressure valve. Through algorithm compensation, the fuel metering accuracy is effectively improved.

[0148] Although the above methods are illustrated and described as a series of actions for simplicity of explanation, it should be understood and appreciated that these methods are not limited by the order of the actions, because according to one or more embodiments, some actions may occur in a different order and / or concurrently with other actions that are illustrated and described herein or that are not illustrated and described herein but are understood by those skilled in the art.

[0149] As shown in this application and the claims, unless the context clearly indicates an exception, words such as "a", "an", "one" and / or "the" are not specifically singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of the clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0150] In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0151] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0152] The above embodiments are provided for those skilled in the art to implement or use the present invention. Those skilled in the art can make various modifications or changes to the above embodiments without departing from the inventive concept of the present invention. Therefore, the protection scope of the present invention is not limited by the above embodiments, but should be the maximum scope that conforms to the innovative features mentioned in the claims.

Claims

1. An electronic temperature compensation device for fuel metering of an aeroengine, characterized in that Including an engine electronic controller, a metering valve, and a fuel temperature sensor: The fuel temperature sensor collects the fuel temperature and feeds it back to the engine electronic controller; The engine electronic controller compensates and controls the fuel mass flow rate of the metering valve by using a fuel medium temperature compensation table according to the obtained fuel temperature; Among them, the fuel medium temperature compensation table is a corresponding relationship table of fuel mass flow rate values under different fuel medium types, fuel temperatures, and metering valve openings pre-calibrated; The fuel medium temperature compensation table is obtained through the following method: For a certain type of fuel medium, according to the control variable method, measure the fuel mass flow rate values at different fuel temperatures and different metering valve openings; Replace the fuel medium and repeat the above steps to obtain the temperature compensation table corresponding to each fuel medium.

2. The electronic temperature compensation device for fuel metering of an aeroengine according to claim 1, characterized in that, It further includes a high-pressure shut-off valve: The fuel temperature sensor is installed at the high-pressure oil input position after the fuel pump of the metering valve in the engine fuel system or at the metered fuel output position of the high-pressure shut-off valve to collect the fuel temperature.

3. The aviation engine fuel metering electronic temperature compensation device according to claim 1, characterized in that: The engine electronic controller calculates the fuel mass flow rate command value Wf_Dem according to the difference between the command value N1_Dem of the low-pressure rotor speed and the actual low-pressure rotor speed N1 value; The engine electronic controller calculates the metering valve opening command value Lfmv_Dem by using the fuel medium temperature compensation table in combination with the fuel medium signal and fuel temperature signal of the fuel currently used by the engine and the fuel mass flow rate command value Wf_Dem.

4. The electronic temperature compensation device for fuel metering of an aero-engine according to claim 1, characterized in that It further includes a resolver, a fuel metering valve servo loop controller, and an electro-hydraulic servo valve: The engine electronic controller receives the actual opening Lfmv_Lead of the metering valve fed back by the resolver, compares it with the metering valve opening command value Lfmv_Dem, and obtains the position error of the metering valve; The fuel metering valve servo loop controller calculates the fuel metering valve control current according to the position error of the metering valve; The electro-hydraulic servo valve receives the fuel metering valve control current signal, outputs a certain flow rate of servo fuel to the metering valve control chamber, and pushes the metering valve to move to the desired position to realize the compensation control of the metered fuel mass flow rate.

5. An electronic temperature compensation method for fuel metering of an aeroengine, characterized in that, Including the following steps: Step S1: Collect the fuel temperature and feed it back to the engine electronic controller; Step S2: The engine electronic controller compensates and controls the metered fuel mass flow rate by using a fuel medium temperature compensation table according to the obtained fuel temperature. The fuel medium temperature compensation table is a corresponding relationship table of fuel mass flow rate values under different fuel medium types, fuel temperatures, and metering valve openings pre-calibrated; The fuel medium temperature compensation table is obtained through the following method: For a certain type of fuel medium, according to the control variable method, measure the fuel mass flow rate values at different fuel temperatures and different metering valve openings; Replace the fuel medium and repeat the above steps to obtain the temperature compensation table corresponding to each fuel medium.

6. The electronic temperature compensation method for fuel metering of an aeroengine according to claim 5, characterized in that, The collection of the fuel temperature in step S1 is obtained through the following method: Install a fuel temperature sensor at the input position of the metering valve in the engine fuel system or at the output position of the high-pressure shut-off valve, and collect the fuel temperature through the fuel temperature sensor.

7. The electronic temperature compensation method for fuel metering of an aeroengine according to claim 5, wherein The step S2 further includes: The engine electronic controller calculates the fuel mass flow command value Wf_Dem according to the difference between the command value N1_Dem of the low-pressure rotor speed and the actual low-pressure rotor speed N1 value. The engine electronic controller calculates the metering valve opening command value Lfmv_Dem by using the fuel medium temperature compensation table in combination with the fuel mass flow command value Wf_Dem based on the fuel medium signal and the fuel temperature signal of the fuel currently used by the engine.

8. The electronic temperature compensation method for fuel metering of an aeroengine according to claim 5, wherein The step S2 further includes: The engine electronic controller receives the actual opening Lfmv_Lead of the metering valve fed back by the resolver, compares it with the metering valve opening command value Lfmv_Dem, and obtains the position error of the metering valve. The fuel metering valve servo loop controller calculates the fuel metering valve control current according to the position error of the metering valve. The electro-hydraulic servo valve receives the fuel metering valve control current signal, outputs a certain flow of servo fuel to the metering valve control chamber, and pushes the metering valve to move to the desired position to achieve the compensation control of the metered fuel mass flow.

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