Method for eliminating the free play of an aeroengine throttle lever

Abstract

The application belongs to the technical field of aero-engine control design, and particularly relates to a method for eliminating the idle stroke of an aero-engine throttle lever, comprising the following steps: determining the stroke range of the throttle lever in the slow-speed state, throttling state and specified thrust state; determining the rotating speed n 1Rmc of the slow-speed state at different height H and Mach number Ma state points of a flight envelope 1R规定 ; determining the required rotating speed n 1Rmc of the specified thrust state at different height H and Mach number Ma state points of the flight envelope 1R规定 ; and interpolating the rotating speed n 1R of the throttling state at different throttle lever angles PLA based on the rotating speed n of the slow-speed state and the required rotating speed n of the specified thrust state at different height H and Mach number Ma state points of the flight envelope.

Description

Technical Field

[0001] This application belongs to the field of aero-engine control design technology, specifically relating to a method for eliminating the idle travel of the aero-engine throttle lever. Background Technology

[0002] The operating state of an aircraft engine is controlled by the throttle lever. When the aircraft engine is operating in a state below the intermediate state, the speed should change with the movement of the throttle lever angle.

[0003] Currently, in the idle state of aero engines, a composite control law is generally used within the flight envelope. This involves selecting the optimal speed control scheme based on the minimum thrust requirements at idle, minimum bleed air pressure requirements, minimum fuel flow requirements, and minimum airflow requirements. In the throttle state, aero engines often use a fixed throttle position corresponding to a fixed speed, which doesn't adequately consider the continuity of speed changes with throttle between idle and throttle states within the flight envelope. This results in a significant idle travel when the throttle lever is pushed during the transition between idle and throttle states. Similarly, in the intermediate states of aero engines, which are typically designed to include multiple specified thrust states, the same issue of a significant idle travel occurs during the transition between these states.

[0004] A large free travel when pushing the throttle lever can reduce the pilot's flying experience and cause confusion in the pilot's control of the aircraft engine. Why does the aircraft engine not respond when the throttle lever is pushed up or pulled down? At the same time, the existence of a large free travel will shorten the actual effective travel of the throttle lever for thrust adjustment, making the thrust response too sensitive to changes in the throttle lever, which is not conducive to the stable control of the aircraft engine.

[0005] This application is made in view of the aforementioned technical deficiencies. Summary of the Invention

[0006] The purpose of this application is to provide a method for eliminating the free travel of the throttle lever in an aircraft engine, so as to overcome or mitigate at least one of the known technical defects.

[0007] The technical solution of this application is:

[0008] A method for eliminating the free travel of an aircraft engine throttle lever includes:

[0009] Determine the travel range of the throttle lever under slow speed, throttle, and specified thrust conditions;

[0010] Determine the idle speed n at different altitudes H and Mach numbers Ma within the flight envelope. 1Rmc ;

[0011] Determine the required rotational speed n for thrust at different altitudes H and Mach numbers Ma within the flight envelope.1R规定 ;

[0012] Based on the flight envelope at different altitudes H and Mach numbers Ma, the idle speed n 1Rmc The required rotational speed n under specified thrust conditions 1R规定 Interpolation determines the rotational speed n of PLA at different throttle lever angles under idle and specified thrust states, and the throttling state. 1R .

[0013] According to at least one embodiment of this application, in the above-described method for eliminating idle travel of the aircraft engine throttle lever, the idle speed n is determined at different altitudes H and Mach numbers Ma of the flight envelope. 1Rmc Specifically:

[0014] Based on the minimum thrust requirements for idle, minimum bleed air pressure requirements, minimum fuel flow requirements, and minimum airflow requirements, the engine speed n at idle is determined at different altitudes H and Mach numbers Ma within the flight envelope. 1Rmc .

[0015] According to at least one embodiment of this application, in the above-described method for eliminating idle travel of the aircraft engine throttle lever, interpolation is used to determine the rotational speed n of the idle speed and the throttle state between specified thrust states at different throttle lever angles PLA. 1R For details, please refer to the following:

[0016] n 1R =n 1Rmc +f(PLA)*(n 1R规定 -n 1Rmc );

[0017] in,

[0018] f(PLA) is the interpolation coefficient for the rotational speed corresponding to the throttle lever angle.

[0019] According to at least one embodiment of this application, in the above-described method for eliminating the idle travel of the aircraft engine throttle lever, eight equal division points are set between the travel of the aircraft engine thrust in idle and specified thrust states, and the throttle lever angle from low to high, f(PLA) is successively taken as 0, 0.15, 0.30, 0.4, 0.50, 0.60, 0.70, 0.80, 0.90, and 1.0.

[0020] According to at least one embodiment of this application, the above-described method for eliminating the idle travel of an aircraft engine throttle lever further includes:

[0021] Experiments verified that the rotational speed n of PLA under different throttle lever angles in the throttle state between idle and specified thrust conditions was... 1RThe design considers whether the existing idle stroke meets the requirements. If not, it re-interpolates to determine the rotational speed n of PLA at different throttle lever angles during idle and specified thrust states under throttle conditions. 1R .

[0022] According to at least one embodiment of this application, in the above-described method for eliminating the idle travel of the aircraft engine throttle lever, experimental verification is specifically carried out using a high-altitude test bench or flight test.

[0023] This application has at least the following beneficial technical effects:

[0024] This invention provides a method for eliminating the idle travel of the throttle lever in an aircraft engine. The method can be designed based on the existing control laws of aircraft engines, is easy to improve, and has wide adaptability. It can efficiently eliminate the idle travel of the throttle lever in aircraft engines, improve the pilot's flying experience, increase the actual effective travel of the throttle lever for thrust adjustment, solve the problem of the thrust response being too sensitive to changes in the throttle lever, and improve the stable control of the aircraft engine. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a method for eliminating the idle travel of the throttle lever in an aircraft engine, provided in an embodiment of this application.

[0026] To better illustrate this embodiment, some parts in the accompanying drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. Furthermore, the drawings are for illustrative purposes only and should not be construed as limiting this application. Detailed Implementation

[0027] To make the technical solution and advantages of this application clearer, the technical solution of this application will be described in a clearer and more complete manner below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of this application, and are only used to explain this application, not to limit this application. It should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings, and other related parts can be referred to the general design.

[0028] Furthermore, unless otherwise defined, the technical or scientific terms used in this application description shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms indicating direction used in this application description are used only to indicate relative direction or positional relationship; when the absolute position of the described object changes, its relative positional relationship may also change accordingly. The word "comprising" as used in this application description indicates that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, but does not exclude other elements or objects.

[0029] Furthermore, it should be noted that, unless otherwise explicitly specified and limited, terms such as "installation" and "connection" used in the description of this application should be interpreted broadly. For example, a connection can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand its specific meaning in this application according to the specific circumstances.

[0030] A method for eliminating the free travel of the throttle lever in an aircraft engine, such as Figure 1 As shown.

[0031] a. Determine the travel range of the throttle lever under slow speed, throttling, and specified thrust conditions.

[0032] The travel range of the throttle lever under various conditions of an aircraft engine can be determined as shown in the table below:

[0033] b. Determine the idle speed n at different altitudes H and Mach numbers Ma within the flight envelope. 1Rmc .

[0034] According to the minimum thrust required by the slow train, n 1Rmc,Fmin =f(F min The minimum aircraft bleed air pressure required is n 1Rmc.P27 =f(P 27，Ma Minimum fuel flow rate requires n 1Rmc.Wfmin =f(W fmin The minimum airflow rate required is n 1Rmc.W1Rmin =f(W 1Rmin The rotational speed n at idle state is determined by the high-selection flight envelope at different altitudes H and Mach numbers Ma. 1Rmc =max{n 1Rmc,Fmin n 1Rmc.P27 n 1Rmc.Wfmin n 1Rmc.W1Rmin ,......}=f(H,Ma。

[0035] c. Determine the required rotational speed n for thrust at different altitudes H and Mach numbers Ma within the flight envelope. 1R规定 .

[0036] When operating an aircraft engine, different specified thrust states can be determined via a state selection switch, and the required rotational speed n for each specified thrust state is specified. 1R规定 Please refer to the following format for confirmation:

[0037] First thrust, defined state thrust F 规定1 The required rotational speed n 1R规定1 =f(F 规定1 H, Ma);

[0038] Second thrust specified state thrust F 规定2 The required rotational speed n 1R规定2 =f(F 规定2 H, Ma); ......;

[0040] The nth thrust under specified state thrust F 规定n The required rotational speed n 1R规定n =f(F 规定n H, Ma).

[0041] d. The idle speed n at different altitudes H and Mach numbers Ma within the flight envelope. 1Rmc The required rotational speed n under specified thrust conditions 1R规定 Interpolation determines the rotational speed n of PLA at different throttle lever angles under idle and specified thrust states, and the throttling state. 1R For details, please refer to the following:

[0042] n 1R =n 1Rmc +f(PLA)*(n 1R规定 -n 1Rmc );

[0043] in,

[0044] f(PLA) is the interpolation coefficient for the engine speed corresponding to the throttle lever angle. To ensure that the thrust of the aero-engine changes linearly between idle and specified thrust states, eight equal division points can be set between the idle and specified thrust states during the throttle lever stroke. From low to high, f(PLA) is successively set to 0, 0.15, 0.30, 0.4, 0.50, 0.60, 0.70, 0.80, 0.90, and 1.0, as shown in the table below: f(PLA) 0 0.15 0.30 0.4 0.50 0.60 0.70 0.80 0.90 1.0

[0045] e. Experimental verification: The rotational speed n of PLA at different throttle lever angles under throttle conditions between idle and specified thrust states. 1R The design involves checking if the existing idle stroke meets the requirements. If not, steps a, b, and c above can be returned for appropriate adjustments. The rotational speed n of PLA at different throttle lever angles during slow speed and specified thrust states under throttle conditions can then be re-interpolated to determine the speed n of PLA at different throttle lever angles. 1R Until the idle speed and the specified thrust state are throttled, the rotational speed n of PLA at different throttle lever angles is measured. 1R The design ensures that the available flight path meets the requirements, allowing pilots to have a better flying experience.

[0046] Experimental verification can be performed using high-altitude test platforms or flight tests.

[0047] The method for eliminating the idle travel of the throttle lever in an aircraft engine, disclosed in the above embodiments, can be designed based on existing control laws of aircraft engines. It is easy to improve, widely adaptable, and can efficiently eliminate the idle travel of the throttle lever, improving the pilot's experience, increasing the actual effective travel of the throttle lever for thrust adjustment, solving the problem of excessive sensitivity of thrust response to throttle lever changes, and improving stable control of the aircraft engine. The technical solution of this application has now been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A method for eliminating the idle travel of an aircraft engine throttle lever, characterized in that, include: Determine the travel range of the throttle lever under slow speed, throttle, and specified thrust conditions; Determine the idle speed n at different altitudes H and Mach numbers Ma within the flight envelope. 1Rmc ; Determine the required rotational speed n for thrust at different altitudes H and Mach numbers Ma within the flight envelope. 1R规定 ; Based on the flight envelope at different altitudes H and Mach numbers Ma, the idle speed n 1Rmc The required rotational speed n under specified thrust conditions 1R规定 Interpolation determines the rotational speed n of PLA at different throttle lever angles between idle and specified thrust states under throttle conditions. 1R ; Determine the idle speed n at different altitudes H and Mach numbers Ma within the flight envelope. 1Rmc Specifically: Based on the minimum thrust requirements for idle, minimum bleed air pressure requirements, minimum fuel flow requirements, and minimum airflow requirements, the engine speed n at idle is determined at different altitudes H and Mach numbers Ma within the flight envelope. 1Rmc ; Interpolation determines the rotational speed n of PLA at different throttle lever angles under idle speed and specified thrust conditions. 1R Specifically: n 1R =n 1Rmc +f(PLA)*(n 1R规定 -n 1Rmc ); in, f(PLA) is the interpolation coefficient for the rotational speed corresponding to the throttle lever angle.

2. The method for eliminating the idle travel of the throttle lever in an aircraft engine according to claim 1, characterized in that, Eight equal division points are set between the idle and specified thrust states of the aero-engine thrust, and the throttle lever angle is from low to high, with f(PLA) successively taking values ​​of 0, 0.15, 0.30, 0.4, 0.50, 0.60, 0.70, 0.80, 0.90, and 1.

0.

3. The method for eliminating the idle travel of the throttle lever in an aircraft engine according to claim 2, characterized in that, Also includes: Experiments verified that the rotational speed n of PLA under different throttle lever angles in the throttle state between idle and specified thrust conditions was... 1R The design considers whether the existing idle stroke meets the requirements. If not, it re-interpolates to determine the rotational speed n of PLA at different throttle lever angles during idle and specified thrust states under throttle conditions. 1R .

4. The method for eliminating the idle travel of the throttle lever in an aircraft engine according to claim 3, characterized in that, The test verification will be conducted using either a high-altitude test platform or a flight test.

Images