Integral separation type metering fuel flow control method, device and storage medium

Abstract

The application relates to the technical field of engine control, and specifically discloses an integral separation type metering fuel flow control method, an integral separation type metering fuel flow control device and a storage medium, wherein the integral separation type metering fuel flow control method comprises the following steps: mechanism modeling and simplification are performed on an electro-hydraulic servo valve to obtain an electro-hydraulic servo valve model; modeling is performed on a fuel metering device to obtain a fuel metering device model; a control system controlled object control structure block diagram is drawn according to the established electro-hydraulic servo valve model and fuel metering device model, and a controlled object transfer function is obtained; reasonable assumptions are made on the controlled object transfer function and simplification is performed; a control system closed-loop control structure block diagram is drawn based on the simplified controlled object transfer function, and an integral separation type PI controller is designed for control; proportional parameters and integral parameters of the control system are obtained, and the control system is used for controlling the metering fuel flow of an engine fuel pump regulator.

Description

Technical Field

[0001] This application relates to the field of engine control technology, specifically to an integral-separate metering fuel flow control method, device, and storage medium. Background Technology

[0002] Metered fuel flow is the most important core control variable in aero-engine control. The speed and stability of metered fuel flow control directly affect the control accuracy of controlled parameters such as engine speed, temperature, and thrust. Currently, metered fuel flow control is generally achieved by an electronic controller and a fuel pump regulator. The electronic controller is the calculation and electrical signal output component, while the fuel pump regulator is the pressurization and actuation component. The electro-hydraulic servo valve is the most commonly used electro-magnetic, mechanical, and hydraulic actuator on the fuel pump regulator, and it generally consists of a torque motor, a nozzle-flange valve, and a spool valve. Due to the influence of electromagnetic forces and the characteristics of mechanical Bourdon tubes, electro-hydraulic servo valves generally exhibit nonlinear characteristics such as dead zone, hysteresis, and zero drift, which poses a challenge to the high-precision control requirements of metered fuel flow. To overcome dead zone, zero drift, and other problems and eliminate steady-state errors, a weak integral element is generally added to the proportional control, and the control parameters are adjusted through experimental tuning.

[0003] However, traditional metering fuel flow control using weak integral PI control suffers from large overshoot, long settling time, difficulty in setting integral parameters, and high requirements for parameter tuning experience. Summary of the Invention

[0004] The purpose of this application is to provide an integral-separated metering fuel flow control method, device and storage medium to solve the problems of large overshoot, long settling time, difficulty in setting integral parameters and high requirements for parameter tuning experience in the traditional metering fuel flow control using weak integral PI control.

[0005] To achieve the above objectives, this application provides an integral separation metering fuel flow control method, including the following steps: performing mechanism modeling on an electro-hydraulic servo valve and simplifying it to obtain an electro-hydraulic servo valve model;

[0006] A fuel metering device model is obtained by modeling the fuel metering device.

[0007] Based on the established electro-hydraulic servo valve model and fuel metering device model, draw the control structure block diagram of the controlled object in the control system and obtain the transfer function of the controlled object.

[0008] The transfer function of the controlled object is rationalized and simplified;

[0009] Based on the simplified transfer function of the controlled object, a block diagram of the closed-loop control structure of the control system is drawn, and an integral-separated PI controller is designed for control.

[0010] The proportional and integral parameters of the control system are obtained, and the control system is used to control the fuel flow rate of the engine fuel pump regulator.

[0011] Optionally, the step of performing mechanistic modeling and simplification of the electro-hydraulic servo valve to obtain the electro-hydraulic servo valve model specifically includes:

[0012] Neglecting the stiffness of the center magnetic spring in the torque motor and assuming the armature rotation angle <5°, torque motor output torque Difference between the output control current and the electronic controller Proportional:

[0013] ,

[0014] in, For torque motor gain, , After the Laplace transform, it is represented as T d (s), ∆I(s);

[0015] Displacement of armature baffle assembly at dual nozzles The resultant torque it experiences The relationship is represented as:

[0016] ,

[0017] in, This indicates the length from the center point of the baffle rotation to the nozzle. For the net stiffness of the armature baffle assembly, For the damping ratio, Let s be the natural frequency, and s be the Laplace operator;

[0018] As the next stage after the nozzle-baffle valve, the spool valve's flow rate... Proportional to the displacement of the nozzle baffle:

[0019] ,

[0020] in, X f After the Laplace transform, it is expressed as ∆Q(s), X f (s), where K2 is a coefficient representing the gain from the displacement of the nozzle baffle to the change in flow rate of the spool valve.

[0021] Spool valve displacement It is the integral of the valve flow rate:

[0022] ,

[0023] in, The area of ​​the slide valve core end face. After the Laplace transform, it is represented as X v (s);

[0024] The flow gain of the slide valve is The flow rate from the spool valve to the load The relationship with the valve displacement is as follows:

[0025] ,

[0026] in, After the Laplace transform, it is represented as Q v (s).

[0027] Optionally, the process of modeling the fuel metering device to obtain a fuel metering device model specifically includes:

[0028] The control of metered fuel flow is transformed into the control of the displacement of the metering needle. Ignoring fluid leakage in the hydraulic chamber that drives the metering needle, the movement speed of the metering needle is obtained. With the flow rate of the driving hydraulic chamber Proportional:

[0029] ,

[0030] in, To measure the displacement of the oil needle, , After the Laplace transform, it is represented as X wf (s), (s), A wf The cross-sectional area of ​​the driving hydraulic chamber.

[0031] Optionally, the controlled object of the control system specifically includes:

[0032] A fuel flow control and execution system comprising at least one of the following mechanisms: torque motor, nozzle baffle valve, spool valve, hydraulic cylinder, metering valve, and differential pressure valve.

[0033] Optionally, the controlled object transfer function specifically includes:

[0034] ,

[0035] Where G(s) is the transfer function of the controlled object, and K4 is the spring torque generated by the feedback rod of the electro-hydraulic servo valve. With the displacement of the slide valve The proportionality coefficient, i.e. .

[0036] Optionally, the step of making rational assumptions and simplifying the transfer function of the controlled object specifically includes:

[0037] Ignoring the dynamic characteristics of the torque motor, the transfer function of the controlled object is simplified to:

[0038] ;

[0039] Further simplifying the transfer function of the controlled object into a pure integral element for controller design, the final simplification is as follows:

[0040] .

[0041] Optionally, the closed-loop control structure of the control system specifically includes:

[0042] The integral-separated proportional-integral algorithm and the simplified transfer function of the controlled object, wherein,

[0043] The steps to achieve integral separation include: when the absolute value of the control deviation is less than a certain threshold ε, i.e. At that time, the output of the circuit is the control deviation. When the conditions are not met, the output of the process is zero.

[0044] Optionally, obtaining the proportional and integral parameters of the control system specifically includes:

[0045] Using the formula:

[0046] ,

[0047] The proportional parameter K is obtained. p Where T is the sampling period, , The closed-loop transfer function of the control system is , ;

[0048] Assume the zero bias current of the electro-hydraulic servo valve is The threshold for the integral term to participate in the calculation can be set to... Setting up points can be done as quickly as possible. Integrating to the zero bias current point within a time interval, using the formula:

[0049] ,

[0050] The integral parameter K is obtained. i .

[0051] To achieve the above objectives, this application also provides an integral-separate metering fuel flow control device, comprising: a memory; and

[0052] A processor connected to the memory, the processor being configured to perform the steps of the method described above.

[0053] To achieve the above objectives, this application also provides a computer storage medium having a computer program stored thereon, wherein the computer program, when executed by a machine, implements the steps of the method described above.

[0054] The embodiments of this application have the following advantages:

[0055] This application provides an integral-separated fuel flow metering control method, comprising: modeling and simplifying an electro-hydraulic servo valve to obtain an electro-hydraulic servo valve model; modeling a fuel metering device to obtain a fuel metering device model; drawing a control structure block diagram of the controlled object of the control system based on the established electro-hydraulic servo valve model and fuel metering device model, and obtaining the transfer function of the controlled object; making rational assumptions and simplifying the transfer function of the controlled object; drawing a closed-loop control structure block diagram of the control system based on the simplified transfer function of the controlled object, and designing an integral-separated PI controller for control; obtaining the proportional and integral parameters of the control system, and using the control system to control the fuel flow metering of the engine fuel pump regulator.

[0056] The above method overcomes the dead zone and zero-point temperature drift characteristics of the actuator, while achieving smaller control overshoot and shorter control settling time. It is easy to program and can be used to solve the problem of rapid, accurate, and reliable control of fuel flow metering in aero-engine fuel pump regulators. It solves the problems of large overshoot, long settling time, difficult integral parameter setting, and high requirements for parameter tuning experience in traditional fuel flow metering control using weak integral PI control. Attached Figure Description

[0057] To more clearly illustrate the embodiments of this application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0058] Figure 1 A flowchart of an integral separation metering fuel flow control method provided for at least one embodiment of this application;

[0059] Figure 2 A block diagram of the controlled object control structure of an integral separation metering fuel flow control method provided in at least one embodiment of this application;

[0060] Figure 3A block diagram of the closed-loop control structure of an integral separation metering fuel flow control method provided for at least one embodiment of this application;

[0061] Figure 4 A block diagram of an integral separation metering fuel flow control device provided for at least one embodiment of this application. Detailed Implementation

[0062] The following specific embodiments illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0063] It should be noted that the steps in the claims and description of this application may be performed substantially in parallel or in reverse order under appropriate circumstances, depending on the function involved.

[0064] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0065] The purpose of this application is to address the problems of large overshoot, long settling time, difficult integral parameter setting, and high requirement for parameter tuning experience in traditional metering fuel flow control using weak integral PI control. It provides an integral separation metering fuel flow control method, device, and storage medium based on mechanism modeling and parameter calculation. This method effectively reduces control overshoot and settling time, achieving rapid and accurate control of the metered fuel flow of the aero-engine fuel pump regulator, thus improving the control accuracy of the aero-engine. The electronic controller is the controller of the control system provided in this application embodiment. The control algorithm designed in this application embodiment is written into the electronic controller to achieve the control of the metered fuel flow of the engine fuel pump regulator.

[0066] One embodiment of this application provides an integral-separation metering fuel flow control method, referencing... Figure 1 , Figure 1 The flowchart provided in at least one embodiment of this application illustrates an integral-separate metering fuel flow control method. It should be understood that the method may also include additional boxes not shown and / or the boxes shown may be omitted, and the scope of this application is not limited in this respect.

[0067] In step 101, the electro-hydraulic servo valve is modeled and simplified to obtain the electro-hydraulic servo valve model.

[0068] Specifically, neglecting the stiffness of the mid-position magnetic spring in the torque motor and assuming that the armature rotation angle is very small ( <5°), torque motor output torque Difference between the output control current and the electronic controller Proportional, see formula (1):

[0069] (1)

[0070] In formula (1) For torque motor gain, , After the Laplace transform, it is represented as T d (s), ∆I(s).

[0071] Displacement of armature baffle assembly at dual nozzles The resultant torque it experiences The relationship is represented as:

[0072] (2)

[0073] in This indicates the length from the center point of the baffle rotation to the nozzle. For the net stiffness of the armature baffle assembly, For the damping ratio, Let be the natural frequency, and s be the Laplace operator.

[0074] As the next stage after the nozzle-baffle valve, the spool valve's flow rate... With nozzle baffle displacement X f Proportional, see formula (3):

[0075] (3)

[0076] in, X f After the Laplace transform, it is expressed as ∆Q(s), X f (s), where K2 is a coefficient representing the gain from the displacement of the nozzle baffle to the change in flow rate of the spool valve.

[0077] Spool valve displacement It is the integral of the valve flow rate:

[0078] (4)

[0079] In the formula The area of ​​the slide valve core end face. After the Laplace transform, it is represented as X v (s).

[0080] The flow gain of the slide valve is The flow rate from the spool valve to the load The relationship with the valve displacement is as follows:

[0081] (5)

[0082] in, After the Laplace transform, it is represented as Q v (s).

[0083] In step 102, the fuel metering device is modeled to obtain the fuel metering device model.

[0084] In some embodiments, the pressure difference across the metering valve of the aircraft engine fuel pump regulator is generally controlled by a constant pressure difference valve to ensure a constant pressure difference and metered fuel flow rate W. f The metering valve opening is directly proportional to the metering needle displacement, and the metering needle displacement is directly proportional to the metering valve opening. The linear displacement sensor detects and feeds back the data to the electronic controller, thus forming a closed-loop control.

[0085] Therefore, in some embodiments, the control of metering fuel flow is transformed into the control of the displacement of the metering needle. Ignoring fluid leakage in the hydraulic chamber that drives the movement of the metering needle, the movement speed of the metering needle is obtained. With the flow rate of the driving hydraulic chamber Proportional, see formula (6):

[0086] (6)

[0087] in, To measure the displacement of the oil needle, , After the Laplace transform, it is represented as X wf (s), (s), A wf The cross-sectional area of ​​the driving hydraulic chamber.

[0088] In formula (6), A wf The cross-sectional area of ​​the driving hydraulic chamber.

[0089] In step 103, based on the established electro-hydraulic servo valve model and fuel metering device model, a control structure block diagram of the controlled object of the control system is drawn, and the transfer function of the controlled object is obtained.

[0090] In some embodiments, the controlled object is a metering fuel flow control execution system comprising a torque motor, a nozzle baffle valve, a slide valve, a hydraulic cylinder, a metering valve, a differential pressure valve, and other mechanisms.

[0091] In some embodiments, it is assumed that the spring torque generated by the feedback rod of the electro-hydraulic servo valve With the displacement of the slide valve Proportional, that is The control structure block diagram is as follows: Figure 2 As shown, Figure 2 This reflects the relationship between formula (1) and formula (6).

[0092] In some embodiments, the transfer function of the controlled object can be obtained by organizing the various links according to the control structure block diagram:

[0093] (7)

[0094] Where G(s) is the transfer function of the controlled object, and K4 is the spring torque generated by the feedback rod of the electro-hydraulic servo valve. With the displacement of the slide valve The proportionality coefficient, i.e. .

[0095] In step 104, the transfer function of the controlled object is rationalized and simplified.

[0096] In general, torque motors are designed during... Generally, the value is large enough that its dynamic characteristics can be ignored. Therefore, in some embodiments, the transfer function is simplified to:

[0097] (8)

[0098] Considering the valve end area Smaller, and In practical engineering, the transfer function can be further simplified into a pure integral element for controller design. Therefore, in some embodiments, the transfer function is ultimately simplified to:

[0099] (9)

[0100] In step 105, based on the simplified transfer function of the controlled object, a block diagram of the closed-loop control structure of the control system is drawn, and an integral-separated PI controller is designed for control.

[0101] In some embodiments, considering the nonlinear characteristics of electro-hydraulic servo valves such as dead zone, hysteresis, and zero drift, an integral-separated PI controller is designed to eliminate steady-state error, reduce control overshoot, and shorten dynamic adjustment time. The closed-loop control structure block diagram is shown below. Figure 3 As shown, Figure 3 This reflects the integral-separated proportional-integral algorithm and the simplified transfer function of the controlled object, K in the figure. p K i ε refers to the proportional parameter, integral parameter, and integral separation threshold that need to be calculated.

[0102] Figure 3 The dashed box element is a key component for achieving integral separation. When the absolute value of the control deviation is less than a certain threshold ε, i.e. At that time, the output of the circuit is the control deviation. When the conditions are not met, the output of the process is zero.

[0103] In step 106, the proportional and integral parameters of the control system are obtained, and the control system is used to control the fuel flow rate of the engine fuel pump regulator.

[0104] Specifically, based on establishing a mechanistic model of the controlled object, this technical solution proposes an integral separation proportional-integral control algorithm. This embodiment details the setting of the integral separation threshold when applying this algorithm. The specific methods for calculating proportional and integral parameters include:

[0105] Ignoring the integral term for now, the closed-loop transfer function of the system is: Based on Shannon's sampling theorem and engineering experience, the sampling angular frequency of the servo system It can be approximated as Sampling period ,in Therefore, the proportional parameter The calculation formula is as follows:

[0106] (10)

[0107] Assume the zero bias current of the electro-hydraulic servo valve is The threshold for the integral term to participate in the calculation can be set to... Setting up a points system can be done as quickly as possible. If the integral reaches the zero bias current point within a certain time, then the integration parameter... The calculation formula is as follows:

[0108] (11)

[0109] In some embodiments, it is assumed , , Let the system sampling period be... Then, according to formula (10), the proportional parameter The calculation is as follows:

[0110]

[0111] Assume the zero bias current of the electro-hydraulic servo valve is The threshold for the integral term to participate in the calculation can be set to... Setting up a points system can be done as quickly as possible. If the integral reaches the zero bias current point within a certain time, then the integration parameter... The calculation is as follows according to formula (11):

[0112]

[0113] The above method overcomes the dead zone and zero-point temperature drift characteristics of the actuator, while achieving smaller control overshoot and shorter control settling time. It is easy to program and can be used to solve the problem of rapid, accurate, and reliable control of fuel flow metering in aero-engine fuel pump regulators. It solves the problems of large overshoot, long settling time, difficult integral parameter setting, and high requirements for parameter tuning experience in traditional fuel flow metering control using weak integral PI control.

[0114] Figure 4 A block diagram of an integral-separate metering fuel flow control device provided for at least one embodiment of this application. The device includes:

[0115] Memory 201; and processor 202 connected to the memory 201, the processor 202 being configured to: perform mechanistic modeling of the electro-hydraulic servo valve and simplify it to obtain an electro-hydraulic servo valve model;

[0116] A fuel metering device model is obtained by modeling the fuel metering device.

[0117] Based on the established electro-hydraulic servo valve model and fuel metering device model, draw the control structure block diagram of the controlled object in the control system and obtain the transfer function of the controlled object.

[0118] The transfer function of the controlled object is rationalized and simplified;

[0119] Based on the simplified transfer function of the controlled object, a block diagram of the closed-loop control structure of the control system is drawn, and an integral-separated PI controller is designed for control.

[0120] The proportional and integral parameters of the control system are obtained, and the control system is used to control the fuel flow rate of the engine fuel pump regulator.

[0121] In some embodiments, the processor 202 is further configured to: perform mechanistic modeling and simplification of the electro-hydraulic servo valve to obtain an electro-hydraulic servo valve model, specifically including:

[0122] Neglecting the stiffness of the center magnetic spring in the torque motor and assuming the armature rotation angle <5°, torque motor output torque Difference between the output control current and the electronic controller Proportional:

[0123] ,

[0124] in, For torque motor gain, , After the Laplace transform, it is represented as T d (s), ∆I(s);

[0125] Displacement of armature baffle assembly at dual nozzles The resultant torque it experiences The relationship is represented as:

[0126] ,

[0127] in, This indicates the length from the center point of the baffle rotation to the nozzle. For the net stiffness of the armature baffle assembly, For the damping ratio, Let s be the natural frequency, and s be the Laplace operator;

[0128] As the next stage after the nozzle-baffle valve, the spool valve's flow rate... Proportional to the displacement of the nozzle baffle:

[0129] ,

[0130] in, X f After the Laplace transform, it is expressed as ∆Q(s), X f (s), where K2 is a coefficient representing the gain from the displacement of the nozzle baffle to the change in flow rate of the spool valve.

[0131] Spool valve displacement It is the integral of the valve flow rate:

[0132] ,

[0133] in, The area of ​​the slide valve core end face. After the Laplace transform, it is represented as X v (s);

[0134] The flow gain of the slide valve is The flow rate from the spool valve to the load The relationship with the valve displacement is as follows:

[0135] ,

[0136] in, After the Laplace transform, it is represented as Q v (s).

[0137] In some embodiments, the processor 202 is further configured to: model the fuel metering device to obtain a fuel metering device model, specifically including:

[0138] The control of metered fuel flow is transformed into the control of the displacement of the metering needle. Ignoring fluid leakage in the hydraulic chamber that drives the metering needle, the movement speed of the metering needle is obtained. With the flow rate of the driving hydraulic chamber Proportional:

[0139] ,

[0140] in, To measure the displacement of the oil needle, , After the Laplace transform, it is represented as X wf (s), (s), A wf The cross-sectional area of ​​the driving hydraulic chamber.

[0141] In some embodiments, the processor 202 is further configured such that the controlled object of the control system specifically includes:

[0142] A fuel flow control and execution system comprising at least one of the following mechanisms: torque motor, nozzle baffle valve, spool valve, hydraulic cylinder, metering valve, and differential pressure valve.

[0143] In some embodiments, the processor 202 is further configured such that the controlled object transfer function specifically includes:

[0144] ,

[0145] Where G(s) is the transfer function of the controlled object, and K4 is the spring torque generated by the feedback rod of the electro-hydraulic servo valve. With the displacement of the slide valve The proportionality coefficient, i.e. .

[0146] In some embodiments, the processor 202 is further configured to: make rational assumptions and simplify the transfer function of the controlled object, specifically including:

[0147] Ignoring the dynamic characteristics of the torque motor, the transfer function of the controlled object is simplified to:

[0148] ;

[0149] Further simplifying the transfer function of the controlled object into a pure integral element for controller design, the final simplification is as follows:

[0150] .

[0151] In some embodiments, the processor 202 is further configured such that the closed-loop control structure of the control system specifically includes:

[0152] The integral-separated proportional-integral algorithm and the simplified transfer function of the controlled object, wherein,

[0153] The steps to achieve integral separation include: when the absolute value of the control deviation is less than a certain threshold ε, i.e. At that time, the output of the circuit is the control deviation. When the conditions are not met, the output of the process is zero.

[0154] In some embodiments, the processor 202 is further configured to: acquire the proportional and integral parameters of the control system, specifically including:

[0155] Using the formula:

[0156] ,

[0157] The proportional parameter K is obtained. p Where T is the sampling period, , The closed-loop transfer function of the control system is , ;

[0158] Assume the zero bias current of the electro-hydraulic servo valve is The threshold for the integral term to participate in the calculation can be set to... Setting up points can be done as quickly as possible. Integrating to the zero bias current point within a time interval, using the formula:

[0159] ,

[0160] The integral parameter K is obtained. i .

[0161] For specific implementation methods, please refer to the aforementioned method embodiments, which will not be repeated here.

[0162] This application may be a method, apparatus, system, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for performing various aspects of this application.

[0163] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example, but not limited to, electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination thereof. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0164] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0165] The computer program instructions used to perform the operations of this application may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuits, such as programmable logic circuits, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), are personalized by utilizing the status information of the computer-readable program instructions. These electronic circuits can execute the computer-readable program instructions to implement various aspects of this application.

[0166] Various aspects of this application are described herein with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer-readable program instructions.

[0167] These computer-readable program instructions can be provided to a processing unit of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that, when executed by the processing unit of the computer or other programmable data processing apparatus, they create means for implementing the functions / actions specified in one or more blocks of the flowchart and / or block diagram. These computer-readable program instructions can also be stored in a computer-readable storage medium that causes a computer, programmable data processing apparatus, and / or other device to operate in a particular manner. Thus, the computer-readable medium storing the instructions comprises an article of manufacture that includes instructions for implementing aspects of the functions / actions specified in one or more blocks of the flowchart and / or block diagram.

[0168] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby causing the instructions that execute on the computer, other programmable data processing apparatus, or other device to perform the functions / actions specified in one or more boxes of a flowchart and / or block diagram.

[0169] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of an instruction containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0170] Note that, unless otherwise explicitly stated, all features disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by alternative features for achieving the same, equivalent, or similar purpose. Therefore, unless explicitly stated otherwise, each disclosed feature is merely one example of a set of equivalent or similar features. Where used, "further," "preferably," "even further," and "more preferably" are simply starting points for describing another embodiment based on the foregoing embodiments, the combination of which with the foregoing embodiments constitutes the complete configuration of another embodiment. Any combination of several "further," "preferably," "even further," or "more preferably" settings following the same embodiment constitutes yet another embodiment.

[0171] Although this application has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of this application fall within the scope of protection claimed in this application.

Claims

1. A method for integral separation metering fuel flow control, characterized in that, Includes the following steps: The electro-hydraulic servo valve model is obtained by performing mechanistic modeling and simplification. A fuel metering device model is obtained by modeling the fuel metering device. Based on the established electro-hydraulic servo valve model and fuel metering device model, draw the control structure block diagram of the controlled object in the control system and obtain the transfer function of the controlled object. The transfer function of the controlled object is rationalized and simplified; Based on the simplified transfer function of the controlled object, a block diagram of the closed-loop control structure of the control system is drawn, and an integral-separated PI controller is designed for control. The proportional and integral parameters of the control system are obtained, and the control system is used to control the fuel flow rate of the engine fuel pump regulator. The process of modeling and simplifying the electro-hydraulic servo valve mechanism to obtain the electro-hydraulic servo valve model specifically includes: Neglecting the stiffness of the center magnetic spring in the torque motor and assuming the armature rotation angle <5°, torque motor output torque Difference between the output control current and the electronic controller Proportional: ， in, For torque motor gain, , After the Laplace transform, it is represented as T d (s), ∆I(s); Displacement of armature baffle assembly at dual nozzles and the resultant torque it experiences The relationship is represented as: ， in, This indicates the length from the center point of the baffle rotation to the nozzle. For the net stiffness of the armature baffle assembly, For the damping ratio, Let s be the natural frequency, and s be the Laplace operator; As the next stage after the nozzle-baffle valve, the spool valve's flow rate... Proportional to the displacement of the nozzle baffle: ， in, X f After the Laplace transform, it is expressed as ∆Q(s), X f (s), where K2 is a coefficient representing the gain from the displacement of the nozzle baffle to the change in flow rate of the spool valve. Spool valve displacement It is the integral of the valve flow rate: ， in, The area of ​​the slide valve core end face. After the Laplace transform, it is represented as X v (s); The flow gain of the slide valve is The flow rate from the spool valve to the load The relationship with the valve displacement is as follows: ， in, After the Laplace transform, it is represented as Q v (s).

2. The integral separation metering fuel flow control method according to claim 1, characterized in that, The process of modeling the fuel metering device to obtain a fuel metering device model specifically includes: The control of metered fuel flow is transformed into the control of the displacement of the metering needle. Ignoring fluid leakage in the hydraulic chamber that drives the metering needle, the movement speed of the metering needle is obtained. With the flow rate of the driving hydraulic chamber Proportional: ， in, To measure the displacement of the oil needle, , After the Laplace transform, it is represented as X wf (s), (s), A wf The cross-sectional area of ​​the driving hydraulic chamber.

3. The integral separation metering fuel flow control method according to claim 2, characterized in that, The controlled objects of the control system specifically include: A fuel flow control and execution system comprising at least one of the following mechanisms: torque motor, nozzle baffle valve, spool valve, hydraulic cylinder, metering valve, and differential pressure valve.

4. The integral separation metering fuel flow control method according to claim 3, characterized in that, The controlled object transfer function specifically includes: ， Where G(s) is the transfer function of the controlled object, and K4 is the spring torque generated by the feedback rod of the electro-hydraulic servo valve. With the displacement of the slide valve The proportionality coefficient, i.e. .

5. The integral separation metering fuel flow control method according to claim 4, characterized in that, The transfer function of the controlled object is rationalized and simplified, specifically including: Ignoring the dynamic characteristics of the torque motor, the transfer function of the controlled object is simplified to: ； Further simplifying the transfer function of the controlled object into a pure integral element for controller design, the final simplification is as follows: 。 6. The integral separation metering fuel flow control method according to claim 5, characterized in that, The closed-loop control structure of the control system specifically includes: The integral-separated proportional-integral algorithm and the simplified transfer function of the controlled object, wherein, The steps to achieve integral separation include: when the absolute value of the control deviation is less than the threshold ε, i.e. At that time, the output of the circuit is the control deviation. When the conditions are not met, the output of the process is zero.

7. The integral separation metering fuel flow control method according to claim 6, characterized in that, The acquisition of the proportional and integral parameters of the control system specifically includes: Using the formula: ， The proportional parameter K is obtained. p Where T is the sampling period; Assume the zero bias current of the electro-hydraulic servo valve is The threshold for the integral term to participate in the calculation is set to Setting up points items can be done as quickly as possible. Integrating to the zero bias current point within a time interval, using the formula: ， The integral parameter K is obtained. i .

8. An integral separation type fuel flow control device, characterized in that, include: Memory; as well as A processor connected to the memory, the processor being configured to perform the steps of the method as claimed in any one of claims 1 to 7.

9. A computer storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a machine, it implements the steps of the method as described in any one of claims 1 to 7.

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