A method for generating evaluation indexes of the dynamic characteristics of an actuator of a nozzle control loop

Abstract

This application belongs to the field of aeroengine nozzle control, and particularly relates to a method for generating dynamic characteristic evaluation indexes of a nozzle control loop actuator. It includes: Step 1, based on the nozzle control loop actuator of an aeroengine, construct a nozzle control loop model; Step 2, perform integration processing on the nozzle control loop model to obtain an equivalent model of the nozzle control loop, extract key parameters affecting dynamic characteristics from the equivalent model of the nozzle control loop, and construct dynamic characteristic evaluation indexes based on the key parameters; Step 3, conduct experimental verification on the dynamic characteristic evaluation indexes. This application uses the indexes of dynamic characteristic evaluation as new product indexes to constrain the product dynamic characteristics, which can improve the consistency of the product characteristics of the double-flow actuator, achieving the purpose of unifying control parameters and improving control quality.

Description

Technical Field

[0001] This application belongs to the field of aero-engine nozzle control, and particularly relates to a method for generating dynamic characteristic evaluation indexes of a nozzle control loop actuator. Background Art

[0002] Conventional control variables of aero-turbofan engines mainly include fuel flow rate Wf, adjustable blade angle a1 at the fan inlet, adjustable blade angle a2 at the compressor inlet, nozzle throat area A8, etc. Currently, in the digital electronic control mode, each control loop is a closed-loop control scheme, and there are slight differences in the composition of each control loop in the control architecture. For example, the main fuel flow rate mainly controls the metering valve, while the main control objects for each geometric angle control are actuators. For the actuator used for geometric angle control, there are two control schemes: the scheme with a distributing valve and the scheme without a distributing valve. Due to the large fuel flow rate requirement, the actuator parts of many geometric angles adopt the scheme of a distributing valve and an actuator. In this paper, the nozzle control adopts the control scheme of a distributing valve, and the displacement of the distributing valve is represented by Ln.

[0003] The scheme of a typical aero-turbofan engine nozzle control loop is as Figure 1 shown. The digital electronic controller receives commands, calculates control laws and control algorithms, and drives the electro-hydraulic servo valve to control the actuator. The actuator part includes an electro-hydraulic servo valve, a distributing valve, and an actuator. There are different schemes for the displacement of the actuator, either internal or external. The sensor provides the displacement signal of the actuator to the digital electronic controller for closed-loop control. Usually, an LVDT sensor built into the distributing valve provides the actual displacement of the distributing valve to the digital electronic controller for closed-loop control. When designing the nozzle control system, by decomposing the indexes, technical indexes are proposed for the actuator with a distributing valve, so as to restrict the dynamic characteristics of the product. For example, the full travel time of the nozzle distributing valve, the full travel time of the actuator, the rise time, the overshoot, the following error, the lag time, etc. are proposed. These technical indexes or system-level indexes are too broad (such as the full travel time, the full travel time of the actuator), and the constraints on the actuator characteristics are insufficient, resulting in large differences in the product characteristics of the double-flow actuators produced by two manufacturers under the current design index constraints. The differences in the product characteristics of the double-flow actuators during the design of the nozzle control parameters require matching different control parameters. It is very difficult for the controller to take into account such large characteristic differences when matching control parameters. During the external field use of the engine, the control parameters need to be adjusted frequently. If the control parameters are not adjusted properly, the parameter swing phenomenon will occur, affecting the working efficiency and the safety of the engine test run.

[0004] Therefore, it is desired to have a technical solution to overcome or at least mitigate at least one of the above defects of the prior art. Summary of the Invention

[0005] The purpose of this application is to provide a method for generating dynamic characteristic evaluation indexes of a nozzle control loop actuator to solve at least one problem existing in the prior art.

[0006] The technical solution of this application is as follows:

[0007] A method for generating dynamic characteristic evaluation indexes of a nozzle control loop actuator, comprising:

[0008] Step 1: Based on the nozzle control loop actuator of an aeroengine, construct a nozzle control loop model;

[0009] Step 2: Integrate the nozzle control loop model to obtain an equivalent model of the nozzle control loop, extract key parameters affecting dynamic characteristics from the equivalent model of the nozzle control loop, and construct dynamic characteristic evaluation indexes based on the key parameters;

[0010] Step 3: Conduct experimental verification on the dynamic characteristic evaluation indexes.

[0011] In at least one embodiment of this application, the nozzle control loop model includes:

[0012] A digital electronic controller module, which includes:

[0013] A first control sub-module, including a first A / D conversion unit, a first A8 calibration line unit, a first filtering unit, and a first voting unit connected in sequence;

[0014] A second control sub-module, including a second A / D conversion unit, a second Ln calibration line unit, a second filtering unit, and a second voting unit connected in sequence;

[0015] A control algorithm unit, configured to receive the first voting signal A8 of the first voting unit and the second voting signal Ln of the second voting unit, and process them to obtain an output control signal;

[0016] A D / A conversion unit, configured to receive the output control signal and perform D / A conversion;

[0017] A nozzle adjustment device module, which includes:

[0018] An electro-hydraulic servo valve flow gain unit, configured to receive the control signal after D / A conversion, and calculate the electro-hydraulic servo valve flow considering hysteresis and dynamic characteristics according to the control signal, and represent its transfer function characteristics with Kv1*F1(s);

[0019] The metering valve displacement integration gain unit is used to receive the flow rate of the electro-hydraulic servo valve, calculate the metering valve displacement according to the flow rate of the electro-hydraulic servo valve, and its characteristics are represented by the integral link KLn1 / s for its transfer function characteristics. It is also used to send the metering valve displacement to the second A / D conversion unit;

[0020] The metering valve flow gain unit is used to receive the metering valve displacement, calculate the metering valve flow rate considering the hysteresis characteristics according to the metering valve displacement, and its transfer function characteristics are represented by KLn2*F2(s);

[0021] The A8 actuator module, the A8 actuator module includes:

[0022] The actuator displacement gain unit is used to receive the metering valve flow rate, calculate the actuator displacement according to the metering valve flow rate, and its transfer function is represented by KA8 / s. It is also used to send the actuator displacement to the first A / D conversion unit through the feedback transmission unit.

[0023] In at least one embodiment of the present application, the equivalent model of the nozzle control loop includes:

[0024] The digital electronic controller module, the digital electronic controller module includes:

[0025] The first control sub-module includes a first A / D conversion unit, a first A8 calibration line unit, a first filtering unit, and a first voting unit connected in sequence;

[0026] The second control sub-module includes a second A / D conversion unit, a second Ln calibration line unit, a second filtering unit, and a second voting unit connected in sequence;

[0027] The control algorithm unit is used to receive the first voting signal A8 of the first voting unit and the second voting signal Ln of the second voting unit, and process them to obtain an output control signal;

[0028] The D / A conversion unit is used to perform D / A conversion on the output control signal;

[0029] The first actuator module, the first actuator module includes:

[0030] The first characteristic unit is used to receive the control signal after A / D conversion and perform hysteresis and dynamic characteristic processing on the control signal;

[0031] The oil metering valve movement rate unit is configured to receive the control signal after considering hysteresis and dynamic characteristics, and calculate the positions of the oil metering valve at different currents according to the control signal. Wherein, KvLn = Kv1 * KLn1 represents the oil metering valve movement rate, and it is also configured to send the displacement of the oil metering valve to the second A / D conversion unit;

[0032] The second characteristic unit is configured to receive the displacement of the oil metering valve, and perform hysteresis and dynamic characteristic processing on the displacement of the oil metering valve;

[0033] The second nozzle actuator module, the second nozzle actuator module includes:

[0034] The actuator movement rate unit is configured to receive the displacement of the oil metering valve considering hysteresis and dynamic characteristics, and calculate the positions of the actuator at different displacements of the oil metering valve according to the displacement of the oil metering valve. Wherein, Kv2 = KLn2 * KA8 is used to represent the actuator movement rate, and it is also configured to send the displacement of the actuator to the first A / D conversion unit through the feedback transmission unit.

[0035] In at least one embodiment of the present application, the key parameters affecting dynamic characteristics extracted from the equivalent model of the nozzle control loop include: the oil metering valve movement rate KvLn and the actuator movement rate Kv2.

[0036] In at least one embodiment of the present application, the dynamic characteristic evaluation indexes constructed based on the key parameters include the oil metering valve movement rate index and the actuator movement rate index.

[0037] The invention has at least the following beneficial technical effects:

[0038] The method for generating the dynamic characteristic evaluation indexes of the nozzle control loop actuator in the present application establishes a nozzle control loop model for the electro-hydraulic servo valve, oil metering valve, and actuator structure, extracts the key parameters affecting dynamic characteristics as the dynamic characteristic evaluation indexes, and uses the dynamic characteristic evaluation indexes as new product indexes to constrain the product dynamic characteristics, which can improve the consistency of the product characteristics of the double-flow actuator and achieve the purpose of unifying control parameters and improving control quality. Description of the Drawings

[0039] Figure 1 is a schematic diagram of the principle of the servo control loop with an oil metering valve and an actuator in the prior art;

[0040] Figure 2 is a schematic diagram of the nozzle control loop model in one embodiment of the present application;

[0041] Figure 3 is a schematic diagram of the equivalent model of the nozzle control loop in one embodiment of the present application;

[0042] Figure 4 It is a schematic diagram of the Ln rate index of an embodiment of the present application;

[0043] Figure 5 It is a schematic diagram of the A8 actuator rate index of an embodiment of the present application. Specific embodiments

[0044] To make the purpose, technical solutions and advantages of the implementation of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of the present application. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application and should not be construed as limiting the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application. The embodiments of the present application will be described in detail below with reference to the drawings.

[0045] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application 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 limiting the protection scope of the present application.

[0046] The following combines the attached Figures 2 to 5 The present application will be further described in detail.

[0047] The present application provides a method for generating an evaluation index for the dynamic characteristics of a nozzle control loop actuator, including the following steps:

[0048] Step 1: Based on the nozzle control loop actuator of an aeroengine, construct a nozzle control loop model;

[0049] Step 2: Perform integration processing on the nozzle control loop model to obtain an equivalent model of the nozzle control loop, extract key parameters affecting the dynamic characteristics from the equivalent model of the nozzle control loop, and construct an evaluation index for the dynamic characteristics based on the key parameters;

[0050] Step 3: Conduct experimental verification on the evaluation index for the dynamic characteristics.

[0051] The method for generating the dynamic characteristic evaluation index of the nozzle control loop actuator of the present application starts from the modeling of the dynamic model of the nozzle control loop, establishes the nozzle control loop model, integrates and simplifies the actuator part of the nozzle control loop to obtain the key parameters affecting the dynamic characteristics; analyzes the dynamic characteristic index system and gives the meanings of two dynamic characteristic evaluation indexes; finally, proposes a product-level test verification method for the newly proposed dynamic characteristic index.

[0052] In an embodiment of the present application, the nozzle control loop model, as Figure 2 shown, includes:

[0053] A digital electronic controller module, which includes:

[0054] A first control sub-module, which includes a first A / D conversion unit, a first A8 calibration line unit, a first filtering unit, and a first voting unit connected in sequence;

[0055] A second control sub-module, which includes a second A / D conversion unit, a second Ln calibration line unit, a second filtering unit, and a second voting unit connected in sequence;

[0056] A control algorithm unit, which is used to receive the first voting signal A8 of the first voting unit and the second voting signal Ln of the second voting unit, and processes them to obtain an output control signal;

[0057] A D / A conversion unit, which is used to receive the output control signal for D / A conversion;

[0058] A nozzle adjustment device module, which includes:

[0059] An electro-hydraulic servo valve flow gain unit, which is used to receive the control signal after D / A conversion and calculate the electro-hydraulic servo valve flow considering hysteresis and dynamic characteristics, and represents its transfer function characteristic with Kv1*F1(s);

[0060] A pilot valve displacement integral gain unit, which is used to receive the electro-hydraulic servo valve flow, calculate the pilot valve displacement according to the electro-hydraulic servo valve flow, represents its transfer function characteristic with an integral link KLn1 / s, and is also used to send the pilot valve displacement to the second A / D conversion unit;

[0061] A pilot valve flow gain unit, which is used to receive the pilot valve displacement and calculate the pilot valve flow considering the hysteresis characteristic according to the pilot valve displacement, and represents its transfer function characteristic with KLn2*F2(s);

[0062] An A8 actuator module, which includes:

[0063] The actuator displacement gain unit is used to receive the flow of the oil distributing valve, calculate the actuator displacement based on the flow of the oil distributing valve, represent its transfer function with KA8 / s, and is also used to send the actuator displacement to the first A / D conversion unit through the feedback transmission unit.

[0064] In this embodiment, a nozzle control loop model adopting the "electro-hydraulic servo valve, oil distributing valve, actuator" scheme is used, where Figure 2 In the EEC box is the digital electronic controller model, including the hardware and software of the controller, the nozzle adjustment device, and the A8 actuator are two nozzle actuators. The control loop is divided into the Ln oil distributing valve control of the inner loop and the A8 area control of the outer loop. The inner loop feedback is KLn_feedback, and the outer loop feedback is KA8_feedback. The description of the model parameters is shown in Table 1.

[0065] Table 1

[0066]

[0067]

[0068] For Figure 2 the model of the actuator part in Figure 3 is further processed to obtain the equivalent model of the nozzle control loop shown in

[0069] The digital electronic controller module, and the digital electronic controller module includes:

[0070] The first control sub-module, including a first A / D conversion unit, a first A8 calibration line unit, a first filtering unit, and a first voting unit connected in sequence;

[0071] The second control sub-module, including a second A / D conversion unit, a second Ln calibration line unit, a second filtering unit, and a second voting unit connected in sequence;

[0072] The control algorithm unit is used to receive the first voting signal A8 of the first voting unit and the second voting signal Ln of the second voting unit, and process them to obtain an output control signal;

[0073] The D / A conversion unit is used to receive the output control signal for D / A conversion;

[0074] The first actuator module, and the first actuator module includes:

[0075] The first characteristic unit is used to receive the control signal after A / D conversion and perform lag and dynamic characteristic processing on the control signal;

[0076] The fuel metering valve movement rate unit is used to receive the control signal considering hysteresis and dynamic characteristics, and calculate the fuel metering valve position at different currents. Among them, KvLn = Kv1 * KLn1 represents the fuel metering valve movement rate, and it is also used to send the fuel metering valve displacement to the second A / D conversion unit;

[0077] The second characteristic unit is used to receive the fuel metering valve displacement and perform hysteresis and dynamic characteristic processing on the fuel metering valve displacement;

[0078] The second nozzle actuator module, the second nozzle actuator module includes:

[0079] The actuator movement rate unit is used to receive the fuel metering valve displacement considering hysteresis and dynamic characteristics, and calculate the actuator position at different displacements of the fuel metering valve. Among them, Kv2 = KLn2 * KA8 is used to represent the actuator movement rate, and it is also used to send the actuator displacement to the first A / D conversion unit through the feedback transmission unit.

[0080] In this embodiment, Figure 3 The description of the model parameters is shown in Table 2.

[0081] Table 2

[0082]

[0083]

[0084] In this embodiment, the key parameters affecting the dynamic characteristics extracted from the equivalent model of the nozzle control loop include: the fuel metering valve movement rate and the actuator movement rate. The dynamic characteristic evaluation indexes constructed based on the key parameters include: the fuel metering valve movement rate index and the actuator movement rate index. The description and comparative analysis of its dynamic characteristic assessment constraint indexes are as follows. Table 3 shows the description of the dynamic characteristic index evaluation method of the existing actuator products.

[0085] Table 3

[0086]

[0087] As shown in Table 3, the existing actuator mainly uses the closed-loop loop composed of the engine digital electronic controller EEC + actuator + feedback link to constrain the design indexes of the whole loop, while the actuator product mainly uses the maximum ability under the maximum current as the dynamic index, lacking detailed dynamic index constraints. As Figure 4 、 5 shown, the Ln movement time at the maximum current and the full movement time of the A8 actuator correspond to the boundary point characteristics in the dynamic characteristic diagram ( Figure 4 and Figure 5The curve endpoints in the box), and the control system closed loop is mainly used at points near 0, from Figure 4 and Figure 5 It can be seen that the design index constraints proposed by the existing indicators are relatively loose. It is difficult to ensure the consistency of the dynamic characteristics of the product using this indicator.

[0088] The method for generating dynamic characteristic evaluation indicators of the nozzle control loop actuator of this application conducts product-level test verification on the dynamic characteristic evaluation indicators. The test methods for the two rate indicators are as follows:

[0089] According to the modeling and simulation process, the test data has a great influence on the modeling accuracy. In order to obtain a more accurate model, the existing semi-physical test method needs to make further requirements:

[0090] (a) Semi-physical testing requires data to be loaded as much as possible, so that it is closer to the actual product performance on the engine;

[0091] (b) Experimental data of current versus Ln speed.

[0092] Based on the maximum and minimum current tests, the balancing current is supplemented with the maximum current, the balancing position is supplemented with the minimum current, and other different currents, selecting at least 5-10 intermediate points. Considering the actual integral characteristic, the oil distributor valve will not remain in a fixed position at a certain current, but will instead move to a mechanical stop. Two currents moving in the same direction cannot be tested continuously; otherwise, the second current will not have valid data. This patent proposes a closed-loop / open-loop switching method, as shown in the test verification items in the table below. Assuming a full range of -0.5 to 0.5, maintaining closed-loop control at -0.45, switch to an open-loop current test, set to a forward current, test the forward movement rate of the oil distributor valve, then return to the -0.45 position for closed-loop control. Then, switch to another open-loop current, test the forward movement rate of the oil distributor valve, and then return to the -0.45 position for closed-loop control. The forward movement rate of the oil distributor valve under multiple current settings is tested in sequence. In reverse, with 0.45 as the closed-loop position, switch to an open-loop current to test the reverse movement rate of the oil-separating valve. Return to the closed-loop position at 0.45, switch to another open-loop current, and test the reverse movement rate of the oil-separating valve at different currents. Repeat this cycle. Complete multiple sets of oil-separating valve velocity test items in both current directions. Table 4 provides recommended test items for the inner-ring oil-separating valve velocity, where "closed loop" represents the closed-loop control mode for the oil-separating valve position, and "open loop" represents the open-loop control mode for the current.

[0093] Table 4

[0094]

[0095] (c) Test data of Ln on D8

[0096] Similar to the oil separation valve Ln, it is necessary to design test items for Ln on D8 to obtain the moving speed of D8 at different Lns. Assuming that D8 is controlled by length at 50 - 100 cm in the small closed loop, the test items shown in Table 5 can be adopted. As shown in the table, perform closed-loop control near the shortest position of the D8 actuator, switch to the open-loop mode, and test the extension speed of the actuator. Pay attention to the directionality. At this time, giving the oil separation valve -0.1, -0.2, -0.3, -0.4, -0.5 can test the extension speed of the D8 actuator. The test method for the other side is the same.

[0097] Table 5

[0098]

[0099] The method for generating the evaluation index of the dynamic characteristics of the actuator of the nozzle control loop of the present application proposes two indexes, namely, the electro-hydraulic servo valve - oil separation valve speed and the oil separation valve - actuator speed, to measure the dynamic characteristics of the actuator. It further expands the original technical index system, and the new two technical indexes reflect the requirements of product linearity and consistency, and have a stronger constraint ability on the dynamic characteristics of the product; the present application proposes two dynamic characteristic test and verification methods for the electro-hydraulic servo valve - oil separation valve speed and the oil separation valve - actuator speed. The dynamic characteristics can be investigated at the product factory stage, which strengthens the assessment ability of the dynamic characteristics. At the same time, the verification node of the dynamic characteristics of the actuator is advanced, improving the system development ability.

[0100] As described above, the above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for generating an evaluation index of the dynamic characteristics of an actuator of a nozzle control loop, characterized in that, Including: Step 1: Based on the actuator of the aero-engine nozzle control loop, construct a nozzle control loop model; Step 2: Perform integration processing on the nozzle control loop model to obtain an equivalent model of the nozzle control loop, extract the key parameters affecting the dynamic characteristics from the equivalent model of the nozzle control loop, and construct a dynamic characteristic evaluation index based on the key parameters; Step 3: Conduct experimental verification on the dynamic characteristic evaluation index; The nozzle control loop model includes: Digital electronic controller module, and the digital electronic controller module includes: The first control sub-module, including a first A / D conversion unit, a first A8 calibration line unit, a first filtering unit, and a first voting unit connected in sequence; The second control sub-module, including a second A / D conversion unit, a second Ln calibration line unit, a second filtering unit, and a second voting unit connected in sequence; A control algorithm unit, which is used to receive the first voting signal A8 of the first voting unit and the second voting signal Ln of the second voting unit, and process them to obtain an output control signal; A D / A conversion unit, which is used to receive the output control signal and perform D / A conversion; Nozzle adjustment device module, and the nozzle adjustment device module includes: Electro-hydraulic servo valve flow gain unit, which is used to receive the output control signal after D / A conversion, and calculate the electro-hydraulic servo valve flow considering hysteresis and dynamic characteristics according to the output control signal. Its transfer function characteristic is represented by Kv1*F1(s), where Kv1 is the flow gain of the electro-hydraulic servo valve, and F1(s) is the hysteresis characteristic + dynamic characteristic function from the electro-hydraulic servo valve to the spool valve; Spool valve displacement integral gain unit, which is used to receive the electro-hydraulic servo valve flow, calculate the spool valve displacement according to the electro-hydraulic servo valve flow, and its characteristic is represented by the integral link KLn1 / s for its transfer function characteristic. It is also used to send the spool valve displacement to the second A / D conversion unit, and KLn1 is the displacement integral gain of the spool valve; Spool valve flow gain unit, which is used to receive the spool valve displacement, calculate the spool valve flow considering the hysteresis characteristic according to the spool valve displacement, and its transfer function characteristic is represented by KLn2*F2(s), where KLn2 is the flow gain of the spool valve, and F2(s) is the hysteresis characteristic function from the spool valve to the actuator feedback; A8 actuator module, and the A8 actuator module includes: Actuator displacement gain unit, which is used to receive the spool valve flow, calculate the actuator displacement according to the spool valve flow, and its transfer function is represented by KA8 / s. It is also used to send the actuator displacement to the first A / D conversion unit through the feedback transmission unit, and KA8 is the displacement gain of the actuator; The equivalent model of the nozzle control loop includes: Digital electronic controller module, and the digital electronic controller module includes: The first control sub-module, including a first A / D conversion unit, a first A8 calibration line unit, a first filtering unit, and a first voting unit connected in sequence; The second control sub-module includes a second A / D conversion unit, a second Ln calibration line unit, a second filtering unit, and a second voting unit that are connected in sequence; The control algorithm unit is configured to receive the first voting signal A8 from the first voting unit and the second voting signal Ln from the second voting unit, and process them to obtain an output control signal; The D / A conversion unit is configured to receive the output control signal and perform D / A conversion; The first actuator module, the first actuator module includes: The first characteristic unit is configured to receive the output control signal after A / D conversion and perform hysteresis and dynamic characteristic processing on the output control signal; The fuel metering valve movement rate unit is configured to receive the output control signal considering hysteresis and dynamic characteristics, and calculate the fuel metering valve position at different currents according to the output control signal. Wherein, KvLn = Kv1 * KLn1 represents the fuel metering valve movement rate, and is also configured to send the fuel metering valve displacement to the second A / D conversion unit, and KvLn is the fuel metering valve movement rate; The second characteristic unit is configured to receive the fuel metering valve displacement and perform hysteresis and dynamic characteristic processing on the fuel metering valve displacement; The second nozzle actuator module, the second nozzle actuator module includes: The actuator movement rate unit is configured to receive the fuel metering valve displacement considering hysteresis and dynamic characteristics, and calculate the actuator position at different fuel metering valve displacements according to the fuel metering valve displacement. Wherein, Kv2 = KLn2 * KA8 is used to represent the actuator movement rate, and is also configured to send the actuator displacement to the first A / D conversion unit through the feedback transmission unit, and Kv2 is the actuator movement rate; The key parameters affecting the dynamic characteristics extracted from the equivalent model of the nozzle control loop include: the fuel metering valve movement rate KvLn and the actuator movement rate Kv2; The dynamic characteristic evaluation indexes constructed based on the key parameters include the fuel metering valve movement rate index and the actuator movement rate index.

Images