CN115506896A - Electronic temperature compensation device and method for fuel metering of aircraft engine - Google Patents
Electronic temperature compensation device and method for fuel metering of aircraft engine Download PDFInfo
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- CN115506896A CN115506896A CN202110693005.7A CN202110693005A CN115506896A CN 115506896 A CN115506896 A CN 115506896A CN 202110693005 A CN202110693005 A CN 202110693005A CN 115506896 A CN115506896 A CN 115506896A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/22—Fuel supply systems
- F02C7/224—Heating fuel before feeding to the burner
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/22—Fuel supply systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
- F02C9/26—Control of fuel supply
- F02C9/263—Control of fuel supply by means of fuel metering valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
- F02C9/26—Control of fuel supply
- F02C9/28—Regulating systems responsive to plant or ambient parameters, e.g. temperature, pressure, rotor speed
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention relates to the technical field of aero-engine control, in particular to an aero-engine fuel metering electronic temperature compensation device and method. The invention provides an electronic temperature compensation device for fuel metering of an aircraft engine, which comprises an engine electronic controller, a metering valve and a fuel temperature sensor, wherein the engine electronic controller comprises the following components in parts by weight: the fuel temperature sensor collects the fuel temperature and feeds the fuel temperature back to the electronic engine controller; the engine electronic controller performs compensation control on the fuel mass flow of the metering valve by using a fuel medium temperature compensation meter according to the obtained fuel temperature; the fuel medium temperature compensation table is a corresponding relation table of different pre-calibrated fuel medium types, fuel temperatures and fuel mass flow values under the opening degree of the metering valve. The invention ensures constant mass flow of the measured fuel oil at different temperatures through the preset temperature compensation meters of different fuel oil media, and has wide application range, strong replaceability and high reliability.
Description
Technical Field
The invention relates to the technical field of aero-engine control, in particular to an aero-engine fuel metering electronic temperature compensation device and method.
Background
An aircraft engine fuel system is an important component of a Full Authority Digital Electronic Control (FADEC) system, and mainly comprises a fuel pump, a fuel metering device, a fuel distributing device, various actuating parts and the like.
Modern aircraft engine fuel systems are developing towards higher flow, higher pressure and higher metering accuracy. The fuel control technology is that fuel with a certain mass flow is supplied to a combustion chamber according to the requirement of an engine, and the aircraft engine requires accurate control of the fuel flow to maintain stable mass flow.
At present, an aircraft engine mostly adopts a constant-pressure-difference oil return type fuel metering device. Fig. 1 shows a schematic diagram of a fuel metering device in the prior art, such as the fuel metering device 100 shown in fig. 1, the fuel pressure before and after metering is maintained at a stable difference value through the combined action of a pressure difference valve 103 and an oil return valve 104, the flow rate of the metered fuel is in direct proportion to the flow area of the metering valve 102, and the opening of the metering valve is controlled in a closed loop manner, so that the fuel metering function is realized.
The calculation of the opening degree of the metering valve is that an Engine Electronic Controller 107 (EEC) calculates the required mass flow rate of the metering fuel according to the current error of the Engine speed, and then calculates the opening degree value of the metering valve through interpolation by a calibration table of the mass flow rate of the metering fuel and the opening degree of the metering valve.
When the electro-hydraulic servo valve 101 receives an instruction of an engine electronic controller 107, the metering valve 102 is controlled to be opened by a certain opening degree, the resolver 105 feeds back the opening degree of the metering valve 102 to the engine electronic controller 107, and when the fuel oil pressure behind the metering valve 102 reaches the opening pressure of the high-pressure shutoff valve 106, the high-pressure shutoff valve 106 is opened, so that closed-loop control is realized.
FIG. 2 discloses a schematic diagram of the prior art fuel metering circuit EEC control logic, and in the embodiment of FIG. 1, the current fuel metering algorithm logic as shown in FIG. 2 is as follows:
the engine electronic controller 107 calculates a command value Wf _ Dem for measuring the fuel mass flow according to the error between the command value N1_ Dem for the low-pressure rotor speed and the actual value N1;
the engine electronic controller 107 calculates a corresponding metering valve opening command value Lfmv _ Dem through interpolation by metering a fuel mass flow command value Wf _ Dem according to a fuel flow calibration table corresponding to the fuel metering device, namely an interpolation table for metering the valve opening and the fuel flow;
the resolver 105 feeds back the actual opening Lfmv _ Lead of the metering valve to the engine electronic controller 107;
an engine electronic controller 107 for calculating a position error of the metering shutter 102;
a Fuel Metering Valve (fmv) servo loop controller 108 for calculating a fmv control current signal based on the position error;
the electro-hydraulic servo valve 101 receives the fmv control current signal, outputs servo fuel oil with a certain flow rate to the control cavity of the metering valve 102, and pushes the metering valve 102 to move to a desired position.
The metering valve is designed with metering holes, and the structure of the metering holes is a thin-wall small hole structure.
Fig. 3 discloses a schematic structural diagram of a thin-walled orifice of the prior art, and as shown in fig. 3, the volume flow formula is:
wherein q is the volume flow through the orifice, C d The flow coefficient of the small hole is A, the flow area of the small hole is A, the delta P is the pressure difference between the front and the back of the small hole, the rho is the fuel density, the d is the diameter of the small hole, and the L is the thin-wall thickness of the small hole.
As can be seen, q = f (C) d A, ap, ρ) of the same metering orifice and under conditions of relatively stable fuel temperature, C can be considered to be d Rho is a constant, when the pressure difference delta P between the front and the back of the metering type hole 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 degree of the metering valve.
Aircraft engines often operate in a variety of harsh environments with widely varying oil temperatures of fuel in the fuel tank, and within the engine, the fuel serves as an important heat sink medium and needs to receive heat transfer from the lubricant. The working environment of the engine is usually severe, the influence of internal and external factors is considered in the whole working cycle, and the variation range of the fuel temperature is large. At present, aircraft engines allow medium temperatures of approximately-50 ℃ to 150 ℃. The change of the fuel temperature causes the change of parameters such as density, viscosity and the like, thereby bringing about the error of the mass flow of the measured fuel, influencing the measurement precision and generating adverse effect on the operation of an engine, therefore, the temperature compensation must be carried out on the measured fuel to keep the mass flow of the measured fuel constant.
For the constant-pressure-difference oil return type fuel metering device which is widely applied at present, the engine mainly adopts a mechanical temperature compensation device to compensate and meter fuel and ensure the metering precision. For example, a temperature compensation sheet is added to a differential pressure valve of the fuel metering device, when the temperature of the fuel rises, the temperature compensation sheet expands, namely the spring stiffness is increased, the control differential pressure of the differential pressure valve is increased, and the mass flow of the metered fuel is kept constant.
Chinese patent application 201611052249.2 discloses a novel fuel temperature compensation method, wherein a temperature compensation rod is additionally arranged in a metering valve, the change of temperature causes the axial length change of the compensation rod, the change quantity is transmitted to a displacement sensor, and the opening degree of the metering valve is adjusted.
Fig. 4 shows a schematic diagram of a differential pressure valve in the prior art, and the differential pressure valve shown in fig. 4 includes a temperature compensation plate 401, where P1 is a pressure before measurement, P2 is a pressure after measurement, psf is a servo pressure, and a differential pressure acting force and a spring force of P1 and P2 are balanced in a steady state.
When the temperature of the fuel rises, the rigidity of the spring is reduced, and the differential pressure valve controls the reduction of the differential pressure, so that the measurement flow is reduced. The fuel temperature is increased, and simultaneously, the density and the viscosity are reduced, the mass flow of the measured fuel is reduced, and the fuel measurement precision is influenced. And the temperature compensation sheet 401 is heated and expanded, so that the spring is compressed, the spring force is increased, the lost pressure difference is compensated to a certain extent, and the fuel oil metering temperature compensation is realized.
The common defects of the mechanical temperature compensation device are that the precision is low, the reliability is low, the modification is poor, the product becomes complex, the characteristic difference of different fuel media is not considered, high temperature and low temperature are difficult to be considered, the compensation characteristic is unstable, accurate compensation in a full temperature range cannot be realized, and the like.
Taking the example that the temperature compensation sheet is additionally arranged on the pressure difference valve of the constant-pressure-difference oil return type fuel metering device, the method has a plurality of defects, including but not limited to the following three points:
1) The compensation precision is poor, and whether the temperature compensation piece has a certain compensation effect or not is generally verified through tests, so that accurate compensation cannot be achieved;
2) The compensation range is limited, the low-temperature and high-temperature characteristics of the temperature compensation pieces are different, and low temperature and high temperature cannot be considered, so that the fuel temperature compensation characteristics of the engine are different under different operating environments, and the conditions that the starting oil supply is insufficient due to the fact that the temperature compensation part of the metering valve is over compensated and the low-temperature starting fails occur in the actual engine test;
3) The reliability of the temperature compensation piece is poor, and the performance of the temperature compensation piece begins to decline along with the running of an engine, so that the fuel temperature compensation characteristic is unstable.
Disclosure of Invention
The invention aims to provide an electronic temperature compensation device and method for fuel metering of an aircraft engine, which solve the problem of metering error caused by fuel temperature change in the prior art for fuel metering.
In order to achieve the above object, the present invention provides an electronic temperature compensation device for fuel metering of an aircraft engine, which comprises an engine electronic controller, a metering valve and a fuel temperature sensor:
the fuel temperature sensor collects the fuel temperature and feeds the fuel temperature back to the electronic engine controller;
the engine electronic controller performs compensation control on the fuel mass flow of the metering valve by using a fuel medium temperature compensation meter according to the obtained fuel temperature;
the fuel medium temperature compensation table is a corresponding relation table of different pre-calibrated fuel medium types, fuel temperatures and fuel mass flow values under the opening degree of the metering valve.
In one embodiment, the fuel medium temperature compensation table is obtained by:
aiming at a certain fuel medium, measuring fuel mass flow values under different fuel temperatures and different metering valve opening degrees according to a control variable method;
and replacing the fuel media, and repeating the steps to obtain the temperature compensation table corresponding to each fuel media.
In one embodiment, the electronic temperature compensation device for fuel metering of an aircraft engine further comprises a high-pressure shutoff valve:
the temperature sensor is arranged at the input position of a metering valve of an engine fuel system or the output position of a high-pressure shutoff valve and used for collecting the fuel temperature.
In one embodiment, the engine electronic controller calculates a fuel mass flow command value Wf _ Dem according to a difference value between a command value N1_ Dem of the low-pressure rotor rotation speed and an actual low-pressure rotor rotation speed N1;
the electronic engine controller calculates a metering valve opening instruction value Lfmv _ Dem by using a fuel medium temperature compensation table according to a fuel medium signal and a fuel temperature signal of fuel used by the current engine and combining a fuel mass flow instruction value Wf _ Dem.
In one embodiment, the electronic temperature compensation device for fuel metering of an aircraft engine further comprises a resolver, a fuel metering valve servo loop controller and an electro-hydraulic servo valve:
the engine electronic controller receives the actual opening degree Lfmv _ Lead of the metering valve fed back by the resolver and compares the actual opening degree Lfmv _ Lead with a metering valve opening degree instruction value Lfmv _ Dem to obtain the position error of the metering valve;
the fuel metering valve servo loop controller calculates the control current of the fuel metering valve according to the position error of the metering valve;
the electro-hydraulic servo valve receives a control current signal of the fuel metering valve, outputs servo fuel with a certain flow rate to the metering valve control cavity, pushes the metering valve to move to a desired position, and realizes compensation control on the mass flow rate of the metered fuel.
In order to achieve the purpose, the invention provides an electronic temperature compensation method for fuel metering of an aircraft engine, which comprises the following steps:
s1, collecting the fuel temperature and feeding the fuel temperature back to an engine electronic controller;
and S2, an engine electronic controller performs compensation control on the measured fuel mass flow by using a fuel medium temperature compensation table according to the obtained fuel temperature, wherein the fuel medium temperature compensation table is a corresponding relation table of pre-calibrated fuel medium types, fuel temperatures and fuel mass flow values under the opening of a measuring valve.
In one embodiment, the fuel medium temperature compensation table is obtained by:
aiming at a certain fuel medium, measuring fuel mass flow values under different fuel temperatures and different metering valve opening degrees according to a control variable method;
and replacing the fuel media, and repeating the steps to obtain the temperature compensation table corresponding to each fuel media.
In an embodiment, the collected fuel temperature in step S1 is obtained by:
a fuel temperature sensor is arranged at the input position of a metering valve or the output position of a high-pressure shutoff valve of an engine fuel system, and the fuel temperature is acquired through the fuel temperature sensor.
In an embodiment, the step S2 further includes:
the engine electronic controller calculates to obtain a fuel mass flow instruction value Wf _ Dem according to the difference value between the instruction value N1_ Dem of the low-pressure rotor rotating speed and the actual low-pressure rotor rotating speed N1;
and the electronic engine controller calculates a metering valve opening command value Lfmv _ Dem by combining a fuel mass flow command value Wf _ Dem and a fuel medium temperature compensation table according to a fuel medium signal and a fuel temperature signal of fuel used by the current engine.
In an embodiment, the step S2 further includes:
the engine electronic controller receives the actual opening Lfmv _ Lead of the metering valve fed back by the resolver and compares the actual opening Lfmv _ Lead with a metering valve opening instruction value Lfmv _ Dem to obtain a position error of the metering valve;
the fuel metering valve servo loop controller calculates the control current of the fuel metering valve according to the position error of the metering valve;
the electro-hydraulic servo valve receives the control current signal of the fuel metering valve, outputs servo fuel with a certain flow to the metering valve control cavity, pushes the metering valve to move to an expected position, and realizes compensation control on the mass flow of the metered fuel.
According to the electronic temperature compensation device and method for fuel metering, the influence of temperature is considered when the EEC calculates the opening degree of the metering valve, the constant mass flow of the metered fuel at different temperatures is ensured, the fuel metering device can be suitable for various fuel media through the preset temperature compensation meters of different fuel media, the application range is wide, the replaceability is strong, the fuel metering precision can be ensured, the design of accessories is simplified to a certain extent, and the reliability is good.
Drawings
The above and other features, characteristics and advantages of the present invention will become more apparent from the following description in conjunction with the accompanying drawings and embodiments, in which like reference numerals denote like features throughout the figures, and in which:
FIG. 1 discloses a schematic diagram of a prior art fuel metering device;
FIG. 2 discloses a schematic diagram of a prior art fuel metering circuit EEC control logic;
FIG. 3 discloses a schematic diagram of a thin-walled aperture of the prior art;
FIG. 4 is a schematic diagram showing the construction of a prior art differential pressure shutter;
FIG. 5 discloses a schematic diagram of a fuel metering electronic temperature compensation device according to an embodiment of the present invention;
FIG. 6 discloses a schematic diagram of fuel metering circuit EEC control logic including temperature compensation in accordance with an embodiment of the present invention;
FIG. 7 discloses a flow chart of a fuel metering electronic temperature compensation method according to an embodiment of the invention;
FIG. 8 discloses a detailed flow chart of a fuel gauging electronics temperature compensation method according to an embodiment of the present invention.
The meaning of the reference symbols in the figures is as follows:
100. a fuel metering device;
101. an electro-hydraulic servo valve;
102. a metering valve;
103. a differential pressure valve;
104. an oil return valve;
105. a resolver;
106. shutting off the valve at high pressure;
107. an engine electronic controller;
108 An fmv servo loop controller;
401. a temperature compensation sheet;
500. a fuel metering device;
501. an electro-hydraulic servo valve;
502. a metering valve;
503. a differential pressure valve;
504. an oil return valve;
505. a resolver;
506. shutting off the valve at high pressure;
507. a servo fuel heater;
508. an engine electronic controller;
509. a fuel temperature sensor;
510 An fmv servo loop controller.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a fuel metering electronic temperature compensation device and a method, wherein a fuel temperature sensor is additionally arranged in a fuel system or the existing fuel temperature sensor of the fuel system is directly utilized, and the fuel temperature sensor is additionally arranged at the position of an engine fuel system close to a metering valve:
the fuel temperature sensor is used for collecting the fuel temperature and feeding back the fuel temperature to the EEC;
the EEC calculates the opening instruction value Lfmv _ Dem of the metering valve by interpolation according to the type of the fuel medium, the metering fuel mass flow instruction value Wf _ Dem and the fuel temperature used by the current engine by using a fuel medium temperature compensation table, performs temperature compensation closed-loop control and ensures that the metering fuel mass flow is constant at different temperatures.
The fuel medium temperature compensation meter is obtained by the following steps:
in a fuel metering characteristic test, fuel mass flow values under different fuel temperatures and different metering valve opening degrees are measured according to a control variable method aiming at a certain fuel medium, and a fuel medium temperature compensation meter in a table form is manufactured.
If N usable fuel media are provided, N groups of fuel metering characteristic tests are carried out, and a temperature compensation table corresponding to each fuel medium is obtained.
The invention generates the corresponding temperature compensation table by corresponding different interpolation tables to different media, thereby realizing the accurate temperature compensation of different kinds of fuel mass flow measurement.
Fig. 5 shows a schematic diagram of a fuel metering electronic temperature compensation device according to an embodiment of the present invention, and as shown in fig. 5, the fuel metering electronic temperature compensation device provided by the present invention includes an electrohydraulic servo valve 501, a metering valve 502, a differential pressure valve 503, an oil return valve 504, a resolver 505, a high pressure shutoff valve 506, a servo fuel heater 507, an engine electronic controller 508 and a fuel temperature sensor 509.
Compared with the temperature compensation sheet of the differential pressure valve in the prior art, the fuel temperature sensor 509 is additionally arranged at the position of the fuel system close to the metering valve 502, the existing fuel temperature sensor can also be utilized, and the fuel temperature sensor 509 feeds the fuel temperature back to the EEC for temperature compensation calculation.
A fuel temperature sensor 509, mounted in the engine fuel system near the fuel metering device, is capable of characterizing the temperature characteristics of the metered fuel.
In the present embodiment, as an example, a fuel temperature sensor 509 is installed after the high pressure shutoff valve 506 to measure the fuel output position.
In other embodiments, the fuel temperature sensor 509 may be mounted in the post-pump high pressure fuel input location of the metering valve 502 or in some other location proximate to the fuel metering component.
The pressure difference valve 503 and the oil return valve 504 work together to make the pressure difference between the front and the back of the metering valve 502 constant, and keep the fuel pressure before and after metering at a stable difference value, so that the flow rate of the metered fuel is in direct proportion to the flow area of the metering valve 502, and then the opening of the metering valve is controlled by a closed loop, when the fuel pressure after the metering valve 502 reaches the opening pressure of the high pressure shutoff valve 506, the high pressure shutoff valve 506 is opened, and the fuel metering function is realized.
When the electro-hydraulic servo valve 501 receives an instruction of an engine electronic controller 508, the metering valve 502 is controlled to be opened by a certain opening degree, and the resolver 505 feeds back the opening degree of the metering valve 502 to the engine electronic controller 508, so that closed-loop control is realized.
In the differential pressure valve 503, P1 is a pre-measurement pressure, P2 is a post-measurement pressure, and Psf is a servo pressure.
The differential pressure valve 503 senses the front and back differential pressure of the metering valve 502, and adjusts the oil return amount by controlling the opening degree of the oil return valve 504, so that the front and back pressure difference of the metering valve 502 is constant.
When the pressure before metering rises, the differential pressure valve 503 controls the opening of the oil return valve 504 to increase, namely the oil return area increases, the oil return amount increases, and the pressure before metering decreases;
when the pressure before metering is reduced, the differential pressure valve 503 controls the opening degree of the oil return valve 504 to be reduced, namely the oil return area is reduced, the oil return amount is reduced, and the pressure before metering is increased.
The fuel metering loop EEC control logic including temperature compensation proposed by the present invention is shown in FIG. 6, which is different from FIG. 2 in that:
an electronic engine control unit (EEC) 508 receiving a fuel temperature signal collected by a fuel temperature sensor 509 and a fuel medium signal used by the engine;
an Engine Electronic Controller (EEC) 508, calculating a command value Wf _ Dem for measuring fuel mass flow according to the error between the command value N1_ Dem of the low-pressure rotor speed and the actual value N1;
an engine electronic control unit (EEC) 508, which finds out a temperature compensation table with a corresponding number according to a fuel medium signal used by the engine;
an Engine Electronic Controller (EEC) 508, which utilizes a temperature compensation table to interpolate and calculate a metering valve opening command value Lfmv _ Dem according to two variables of fuel temperature and Wf _ Dem;
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;
an Engine Electronic Controller (EEC) 508, which calculates the position error of the metering flap 502;
a fmv servo loop controller 510 that calculates fmv control current based on the position error;
the electrohydraulic servo valve 501 receives the fmv control current signal, outputs a certain flow of servo fuel to the control cavity of the metering valve 502 of the fuel metering device 500, and pushes the metering valve 502 to move to a desired position, so as to realize fuel metering including fuel temperature compensation.
Fig. 7 discloses a flowchart of a fuel gauging electronics temperature compensation method according to an embodiment of the present invention, and as shown in fig. 7, the fuel gauging electronics temperature compensation method according to the present invention includes the following steps:
s1, collecting the fuel temperature and feeding the fuel temperature back to an engine electronic controller;
and S2, the electronic controller of the engine performs compensation control on the measured fuel mass flow by using a fuel medium temperature compensation table according to the obtained fuel temperature, wherein the fuel medium temperature compensation table is a corresponding relation table of different fuel medium types, fuel temperatures and fuel mass flow values under the opening degree of the measuring valve, which are calibrated in advance.
The fuel medium temperature compensation table is obtained by the following method:
aiming at a certain fuel medium, measuring fuel mass flow values under different fuel temperatures and different metering valve opening degrees according to a control variable method;
and replacing the fuel media, and repeating the steps to obtain the temperature compensation table corresponding to each fuel media.
Fig. 8 discloses a detailed flowchart of a fuel metering electronic temperature compensation method according to an embodiment of the present invention, and the fuel metering electronic temperature compensation method shown in fig. 8 specifically includes the following steps:
in the fuel metering characteristic test stage, aiming at a certain type of fuel medium, the fuel mass flow under different fuel temperatures and different metering valve openness is measured according to a control variable method.
For example, m fuel temperature values are set as T1 and T2 \ 8230Tm;
setting j opening values of metering valves, which are L1 and L2 \8230andLj respectively;
adjusting the fuel temperature to T1, measuring the fuel mass flow rate of the metering valves L1 and L2 \8230, under the opening degree of Lj, thereby generating j fuel mass flow rate values;
adjusting the fuel temperature to T2, and measuring the fuel mass flow rate of the metering valves L1 and L2 \8230, under the opening of Lj, so as to generate j fuel mass flow rate values;
repeating the steps for m times of tests to generate m × j flow values;
and replacing fuel media, and measuring the mass flow of the metering fuel under different fuel temperatures and different metering valve opening degrees according to the same method.
The test was repeated N times, assuming N available fuels.
Arranging the obtained data into N tables, numbering each table, and enabling the numbers to correspond to the types of the fuel media one by one to generate a corresponding fuel media temperature compensation table, and writing the tables into EEC calculation software;
an Engine Electronic Controller (EEC) for calculating a command value Wf _ Dem for measuring the fuel mass flow according to the command value N1_ Dem of the low-pressure rotor speed and the speed error of the actual N1 value;
an Engine Electronic Controller (EEC) which interpolates and calculates a valve opening command value Lfmv _ Dem according to a fuel medium type signal, a fuel temperature signal and a fuel mass flow command value Wf _ Dem currently used by the engine by using a fuel medium temperature compensation table;
the engine electronic controller receives the actual opening degree Lfmv _ Lead of the metering valve fed back by the resolver and compares the actual opening degree Lfmv _ Lead with a metering valve opening degree instruction value Lfmv _ Dem to obtain the position error of the metering valve;
the fuel metering valve servo loop controller is used for calculating the control current of the fuel metering valve according to the position error of the metering valve;
the electro-hydraulic servo valve receives a control current signal of the fuel metering valve, outputs servo fuel with a certain flow to the metering valve control cavity, controls the metering valve to open a certain opening, feeds the opening back to an Engine Electronic Controller (EEC) by the resolver, controls the opening of the metering valve in a closed-loop mode, pushes the metering valve to move to a desired position, realizes compensation control on the mass flow of the metered fuel, and finishes fuel metering including fuel temperature compensation.
Compared with the existing constant differential pressure oil return type fuel metering device, the electronic temperature compensation device and the method for fuel metering provided by the invention have the advantages that the design of a temperature compensation sheet of a differential pressure valve of the fuel metering device is cancelled, the number of parts is reduced, the structural complexity of a fuel metering system is simplified, the accurate compensation of the fuel flow metering in the full temperature range of an engine is realized by an electronic temperature compensation mode, and the low-temperature and high-temperature characteristics are considered.
The electronic temperature compensation device and method for fuel oil metering provided by the invention have the following beneficial effects:
1) A mechanical temperature compensation device is cancelled, so that the fuel metering device becomes simpler and more reliable;
2) The temperature rise characteristics of different fuel media are fully considered to be different, the variable of the type of the fuel media is introduced, and the fuel metering precision is effectively improved by customizing a temperature compensation table for each fuel media;
3) By introducing the variable of the fuel temperature, the accurate temperature compensation of the fuel flow in the full-temperature range can be realized, and the fuel metering accuracy is effectively improved;
4) The electronic temperature compensation method can provide the metering fuel temperature compensation with stable performance in the working period of the engine, and the problem of performance decline of a mechanical device does not exist;
5) The influence of the fuel temperature on the metering characteristic of the metering device is fully considered, particularly the influence of the fuel temperature on the control pressure difference of the pressure difference valve is compensated through an algorithm, and the fuel metering precision is effectively improved.
While, for purposes of simplicity of explanation, the methodologies are shown and described as a series of acts, it is to be understood and appreciated that the methodologies are not limited by the order of acts, as some acts may, in accordance with one or more embodiments, occur in different orders and/or concurrently with other acts from that shown and described herein or not shown and described herein, as would be understood by one skilled in the art.
As used in this application and in the claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to include the plural, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" are intended to cover only the explicitly identified steps or elements as not constituting an exclusive list and that the method or apparatus may comprise further steps or elements.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but 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 thus, should not be construed as limiting the present invention.
The above-described embodiments are provided to enable persons skilled in the art to make or use the invention, and that persons skilled in the art may make modifications or changes to the above-described embodiments without departing from the inventive concept thereof, and therefore the scope of protection of the invention is not limited by the above-described embodiments but should be accorded the widest scope consistent with the innovative features recited in the claims.
Claims (10)
1. The electronic temperature compensation device for fuel metering of the aircraft engine is characterized by comprising an engine electronic controller, a metering valve and a fuel temperature sensor:
the fuel temperature sensor collects the fuel temperature and feeds the fuel temperature back to the electronic engine controller;
the engine electronic controller performs compensation control on the fuel mass flow of the metering valve by using a fuel medium temperature compensation meter according to the obtained fuel temperature;
the fuel medium temperature compensation table is a corresponding relation table of pre-calibrated fuel medium types, fuel temperatures and fuel mass flow values under the opening degree of the metering valve.
2. The electronic temperature compensation device for aircraft engine fuel metering according to claim 1, characterized in that the fuel medium temperature compensation table is obtained by:
aiming at a certain fuel medium, measuring fuel mass flow values under different fuel temperatures and different metering valve opening degrees according to a control variable method;
and replacing the fuel media, and repeating the steps to obtain the temperature compensation table corresponding to each fuel media.
3. The aircraft engine fuel gauging electronics temperature compensating device according to claim 1, further comprising a high pressure shut-off shutter:
the fuel temperature sensor is arranged at the rear high-pressure fuel input position of a fuel pump of a metering valve of an engine fuel system or the metering fuel output position of a high-pressure shutoff valve and is used for collecting the fuel temperature.
4. The aircraft engine fuel gauging electronics temperature compensation device according to claim 1, wherein:
the engine electronic controller calculates to obtain a fuel mass flow instruction value Wf _ Dem according to the difference value between the instruction value N1_ Dem of the low-pressure rotor rotating speed and the actual low-pressure rotor rotating speed N1;
the electronic engine controller calculates a metering valve opening command value Lfmv _ Dem by combining a fuel mass flow command value Wf _ Dem and a fuel medium temperature compensation table according to a fuel medium signal and a fuel temperature signal of fuel used by the current engine.
5. The electronic temperature compensation device for fuel metering of an aircraft engine according to claim 1, further comprising a resolver, a fuel metering valve servo loop controller and an electro-hydraulic servo valve:
the engine electronic controller receives the actual opening degree Lfmv _ Lead of the metering valve fed back by the resolver and compares the actual opening degree Lfmv _ Lead with a metering valve opening degree instruction value Lfmv _ Dem to obtain the position error of the metering valve;
the fuel metering valve servo loop controller calculates the control current of the fuel metering valve according to the position error of the metering valve;
the electro-hydraulic servo valve receives a control current signal of the fuel metering valve, outputs servo fuel with a certain flow rate to the metering valve control cavity, pushes the metering valve to move to a desired position, and realizes compensation control on the mass flow rate of the metered fuel.
6. An electronic temperature compensation method for fuel metering of an aircraft engine is characterized by comprising the following steps:
s1, collecting the fuel temperature and feeding the fuel temperature back to an engine electronic controller;
and S2, the electronic controller of the engine performs compensation control on the measured fuel mass flow by using a fuel medium temperature compensation table according to the obtained fuel temperature, wherein the fuel medium temperature compensation table is a corresponding relation table of different fuel medium types, fuel temperatures and fuel mass flow values under the opening degree of the measuring valve, which are calibrated in advance.
7. The aircraft engine fuel gauging electronic temperature compensation method according to claim 6, wherein said fuel medium temperature compensation table is obtained by:
aiming at a certain fuel medium, measuring fuel mass flow values under different fuel temperatures and different metering valve opening degrees according to a control variable method;
and replacing the fuel media, and repeating the steps to obtain the temperature compensation table corresponding to each fuel media.
8. The aircraft engine fuel gauging electronic temperature compensation method according to claim 6, wherein the collected fuel temperature of step S1 is obtained by:
a fuel temperature sensor is arranged at the input position of a metering valve or the output position of a high-pressure shutoff valve of an engine fuel system, and the fuel temperature is acquired through the fuel temperature sensor.
9. The aircraft engine fuel gauging electronics temperature compensation method according to claim 6, wherein said step S2 further comprises:
the engine electronic controller calculates to obtain a fuel mass flow instruction value Wf _ Dem according to the difference value between the instruction value N1_ Dem of the low-pressure rotor rotating speed and the actual low-pressure rotor rotating speed N1 value;
and the electronic engine controller calculates a metering valve opening command value Lfmv _ Dem by combining a fuel mass flow command value Wf _ Dem and a fuel medium temperature compensation table according to a fuel medium signal and a fuel temperature signal of fuel used by the current engine.
10. The aircraft engine fuel gauging electronics temperature compensation method according to claim 6, wherein said step S2 further comprises:
the engine electronic controller receives the actual opening Lfmv _ Lead of the metering valve fed back by the resolver and compares the actual opening Lfmv _ Lead with a metering valve opening instruction value Lfmv _ Dem to obtain a position error of the metering valve;
the fuel metering valve servo loop controller is used for calculating the control current of the fuel metering valve according to the position error of the metering valve;
the electro-hydraulic servo valve receives the control current signal of the fuel metering valve, outputs servo fuel with a certain flow rate to the metering valve control cavity, pushes the metering valve to move to a desired position, and realizes compensation control on the mass flow rate of the metered fuel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110693005.7A CN115506896A (en) | 2021-06-22 | 2021-06-22 | Electronic temperature compensation device and method for fuel metering of aircraft engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110693005.7A CN115506896A (en) | 2021-06-22 | 2021-06-22 | Electronic temperature compensation device and method for fuel metering of aircraft engine |
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| Publication Number | Publication Date |
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| CN115506896A true CN115506896A (en) | 2022-12-23 |
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| CN202110693005.7A Pending CN115506896A (en) | 2021-06-22 | 2021-06-22 | Electronic temperature compensation device and method for fuel metering of aircraft engine |
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| Country | Link |
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| CN (1) | CN115506896A (en) |
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- 2021-06-22 CN CN202110693005.7A patent/CN115506896A/en active Pending
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