CN115075954B - Method and device for improving starting success rate of engine - Google Patents
Method and device for improving starting success rate of engine Download PDFInfo
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- CN115075954B CN115075954B CN202210564569.5A CN202210564569A CN115075954B CN 115075954 B CN115075954 B CN 115075954B CN 202210564569 A CN202210564569 A CN 202210564569A CN 115075954 B CN115075954 B CN 115075954B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/26—Starting; Ignition
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
- F02C9/48—Control of fuel supply conjointly with another control of the plant
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The application provides a method and a device for improving the success rate of engine starting, wherein the method for improving the success rate of engine starting comprises the following steps: calculating the rotating speed increasing rate of the starting acceleration section of the engine according to the measured rotating speed; comparing the rotating speed increasing rate with a preset rotating speed limit value to determine a distortion interval of the rotating speed signal, and correcting the distorted rotating speed by using a rotating speed feedback value; and calculating the fuel quantity of the engine starting acceleration section according to the corrected rotating speed and the preset oil-gas ratio of the starting acceleration section, and controlling the starting of the engine by using the fuel quantity. The method and the device can correct the engine rotating speed distortion signal and improve the starting success rate of the engine in a complex electromagnetic signal environment.
Description
Technical Field
The application belongs to the field of engine pneumatic performance testing, and particularly relates to a method and a device for improving the starting success rate of an engine.
Background
In the control of an aircraft engine, the engine speed is an important controlled quantity and is also an important parameter for evaluating the performance of the engine. The rotating speed of the engine is generally measured by a magnetoelectric rotating speed sensor in the aircraft engine, and because the engine has huge noise and vibration when working and electromagnetic interference of starting or stopping of high-power electric equipment, and the test environment is very severe, the rotating speed signal measured by the rotating speed sensor is easy to distort, so that the deviation between the measured rotating speed data and the actual rotating speed value is far. In addition, the oil supply phase in the starting process of the engine generally comprises a filling section, an ignition section and an acceleration section, wherein the required fuel amount of the filling section and the ignition section is fixed; the fuel quantity of the acceleration section is obtained by calculation through a given oil-gas ratio and a relative conversion rotating speed, and the fuel quantity is related to the measured rotating speed, the inlet temperature of the compressor and the outlet pressure of the compressor. The engine is very sensitive to the fuel flow in the starting process, and the deviation of the fuel supply of the engine is usually caused by the possible distortion of the rotating speed, so that the engine is easily over-heated and suspended, the starting failure of the engine is caused, and the reliability and the service life of the engine are further influenced.
Disclosure of Invention
To overcome, at least to some extent, the problems in the related art, the present application provides a method and apparatus for increasing the success rate of engine starting.
According to a first aspect of embodiments of the present application, there is provided a method for improving a success rate of starting an engine, comprising:
calculating the rotating speed increasing rate of the starting acceleration section of the engine according to the measured rotating speed;
comparing the rotating speed increasing rate with a preset rotating speed limiting value to determine a distortion interval of the rotating speed signal, and correcting the distorted rotating speed by using a rotating speed feedback value;
and calculating the fuel quantity of the starting acceleration section of the engine according to the corrected rotating speed and the preset oil-gas ratio of the starting acceleration section, and controlling the starting of the engine by using the fuel quantity.
In the above method for increasing the success rate of starting the engine, the process of calculating the rotation speed increase rate of the engine starting acceleration section according to the measured rotation speed includes:
and calculating the rotating speed increasing rate of the starting acceleration section according to the measured rotating speeds at four continuous moments.
Further, the process of calculating the rotation speed increase rate of the start-up acceleration section according to the measured rotation speeds at four consecutive moments is as follows:
calculating the rotating speed increasing rate N (t) of the starting acceleration section according to the measured rotating speed N (t) at the moment t, the measured rotating speed N (t-1) at the moment t-1, the measured rotating speed N (t-2) at the moment t-2 and the measured rotating speed N (t-3) at the moment t-3 dot (t)：
In the formula, Δ t represents a time interval.
In the method for improving the success rate of starting the engine, the process of comparing the speed increase rate with the preset speed limit value to determine the distortion interval of the speed signal and correcting the distorted speed by using the speed feedback value comprises the following steps:
if the rate of increase N of the rotation speed at the present moment dot (t) greater than or equal to a predetermined speed limit N dot-D And judging that the rotation speed signal is distorted, and correcting the rotation speed increasing rate at the current moment to obtain a corrected rotation speed N' (t):
N′(t)＝N(t-1)+N dot (t)*Δt。
further, in the process of comparing the rotating speed increasing rate with a preset rotating speed limit value to determine a distortion interval of the rotating speed signal and correcting the distorted rotating speed by using the rotating speed feedback value, if the rotating speed increasing rate N at the current moment dot (t) is less than the preset rotation speed limit value N dot-D And judging that the rotation speed signal is not distorted, and correcting the rotation speed increasing rate at the current moment is not needed.
Further, the process of calculating the fuel amount of the engine starting acceleration section according to the corrected rotating speed and the preset oil-gas ratio of the starting acceleration section and controlling the starting of the engine by using the fuel amount comprises the following steps:
fuel quantity W of engine starting acceleration section f Comprises the following steps:
W f ＝P 3 *f(n R )，
in the formula, P 3 Representing measured values of compressor outlet pressure, f (n) R ) Representing the gas-oil ratio, n R Representing the relative converted rotation speed;
relative conversion speed n R Comprises the following steps:
in the formula, N D Representing a predetermined physical speed, T 25D Representing a preset compressor inlet temperature value, T 25 Representing measured compressor inlet temperature, P 25 Representing measured values of compressor inlet pressure, P 0 Represents a standard atmospheric pressure;
and controlling the opening degree of the fuel metering valve according to the relation between the opening degree of the fuel metering valve and the fuel amount to output the corresponding fuel amount, and controlling the starting of the engine by using the fuel amount.
According to a second aspect of the embodiments of the present application, there is also provided an apparatus for improving engine start success rate, including a memory and a controller coupled to the memory, the controller being configured to execute any one of the above methods for improving engine start success rate based on instructions stored in the memory.
According to a third aspect of embodiments of the present application, there is also provided a computer storage medium having an executable program stored thereon, the executable program, when called, performing any of the above-mentioned methods for increasing the success rate of engine starting.
According to the above embodiments of the present application, at least the following advantages are obtained: according to the method for improving the success rate of engine starting, the rotating speed increasing rate of the engine starting acceleration section is calculated, the distortion interval of the rotating speed signal is determined according to the comparison result of the rotating speed increasing rate and the preset rotating speed limit value, the distorted rotating speed is corrected by the rotating speed feedback value, the fuel quantity of the engine starting acceleration section is calculated according to the corrected rotating speed and the preset oil-gas ratio of the starting acceleration section, the starting of the engine is controlled by the fuel quantity, the engine rotating speed distortion signal can be corrected, and the success rate of starting the engine in a complex electromagnetic signal environment is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the scope of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of the specification of the application, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.
FIG. 1 is a schematic diagram of the engine starting speed distortion and the corrected speed variation.
FIG. 2 is a flowchart of a method for increasing a success rate of engine starting according to an embodiment of the present disclosure.
FIG. 3 is a schematic diagram of an operating mode for controlling an engine by using a method for increasing a success rate of starting the engine according to an embodiment of the present disclosure.
Detailed Description
For the purpose of promoting a clear understanding of the objects, aspects and advantages of the embodiments of the present application, reference will now be made to the accompanying drawings and detailed description, wherein like reference numerals refer to like elements throughout.
The illustrative embodiments and descriptions of the present application are provided to explain the present application and not to limit the present application. In addition, the same or similar reference numbers used in the drawings and the embodiments are used to denote the same or similar parts.
As used herein, "first," "second," …, etc., are not specifically meant to be sequential or in-order, nor are they meant to limit the present application, but merely to distinguish between elements or operations described in the same technical language.
As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.
As used herein, "and/or" includes any and all combinations of the described items.
References to "plurality" herein include "two" and "more than two"; reference to "multiple sets" herein includes "two sets" and "more than two sets".
Certain words used to describe the present application are discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the present application.
As shown in FIG. 1, under a complex electromagnetic environment, a rotating speed signal is often distorted during the starting process of an engine, and the distortion of the rotating speed signal easily causes deviation of the fuel quantity of the engine, further causes the starting failure of the engine, and influences the reliability and the service life of the engine.
In order to improve the starting success rate of the engine under the complex electromagnetic environment, as shown in fig. 2, the application provides a method for improving the starting success rate of the engine, which comprises the following steps:
s1, calculating the rotating speed increasing rate of an engine starting acceleration section according to the measured rotating speed, wherein the specific process is as follows:
and calculating the rotating speed increasing rate of the starting acceleration section according to the measured rotating speeds at the four continuous moments. Specifically, to reduce the random deviation, the rotation speed increase rate N of the start-up acceleration section may be calculated using the measured rotation speeds at four consecutive times dot (t)：
In the formula (1), Δ t represents a time interval, N (t) represents a measured rotation speed at time t, N (t-1) represents a measured rotation speed at time t-1, N (t-2) represents a measured rotation speed at time t-2, and N (t-3) represents a measured rotation speed at time t-3.
S2, comparing the rotating speed increasing rate with a preset rotating speed limiting value to determine a distortion interval of the rotating speed signal, and correcting the distorted rotating speed by using a rotating speed feedback value, wherein the specific process comprises the following steps:
if the rate of increase N of the rotation speed at the present moment dot (t) greater than or equal to a predetermined speed limit N dot-D And judging that the rotation speed signal is distorted, and correcting the rotation speed increasing rate at the current moment to obtain a corrected rotation speed N' (t):
N′(t)＝N(t-1)+N dot (t-1)*Δt (2)
if the rate of increase N of the rotation speed at the present moment dot (t) is less than the preset rotation speed limit value N dot-D And judging that the rotation speed signal is not distorted, and correcting the rotation speed increasing rate at the current moment is not needed.
S3, as shown in the figure 3, calculating the fuel quantity of the engine starting acceleration section according to the corrected rotating speed and the preset oil-gas ratio of the starting acceleration section, and controlling the starting of the engine by using the fuel quantity, wherein the specific process comprises the following steps:
fuel quantity W of engine starting acceleration section f Comprises the following steps:
W f ＝P 3 *f(n R ) (3)
in formula (3), P 3 Representing measured values of compressor outlet pressure, f (n) R ) Representing the gas-oil ratio, n R Indicating the relative converted rotational speed.
Wherein the relative conversion speed n R Comprises the following steps:
in the formula (4), N D Representing a predetermined physical speed, T 25D Representing a preset compressor inlet temperature value, T 25 Representing measured values of compressor inlet temperature, P 25 Representing measured values of compressor inlet pressure, P 0 Indicating a standard atmospheric pressure having a value of 101.325kPa.
And controlling the opening degree of the fuel metering valve according to the relation between the opening degree of the fuel metering valve and the fuel amount to output the corresponding fuel amount, and controlling the starting of the engine by using the fuel amount.
After multiple engine test verifications, the method for improving the engine starting success rate provided by the application can better solve the problem of engine rotating speed signal distortion by comparing and correcting the rotating speed of the engine starting acceleration section, and improve the starting success rate of the engine in a complex electromagnetic signal environment.
In an exemplary embodiment, an apparatus for improving engine start success rate is further provided, which includes a memory and a controller coupled to the memory, the controller being configured to execute a method for improving engine start success rate in any of the embodiments of the present application based on instructions stored in the memory.
The memory may be a system memory, a fixed nonvolatile storage medium, or the like, and the system memory may store an operating system, an application program, a boot loader, a database, other programs, and the like.
In an exemplary embodiment, the present application further provides a computer storage medium, which is a computer readable storage medium, for example, a memory including a computer program, which is executable by a processor to implement the method for improving the engine start success rate in any of the embodiments of the present application.
The foregoing is merely an illustrative embodiment of the present application, and any equivalent changes and modifications made by those skilled in the art without departing from the spirit and principles of the present application shall fall within the protection scope of the present application.
Claims (8)
1. A method of increasing the success rate of engine starting, comprising the steps of:
calculating the rotating speed increasing rate of the starting acceleration section of the engine according to the measured rotating speed;
comparing the rotating speed increasing rate with a preset rotating speed limit value to determine a distortion interval of the rotating speed signal, and correcting the distorted rotating speed by using a rotating speed feedback value;
and calculating the fuel quantity of the starting acceleration section of the engine according to the corrected rotating speed and the preset oil-gas ratio of the starting acceleration section, and controlling the starting of the engine by using the fuel quantity.
2. The method for improving the success rate of engine starting according to claim 1, wherein the process of calculating the speed increase rate of the engine starting acceleration section according to the measured speed is as follows:
and calculating the rotating speed increasing rate of the starting acceleration section according to the measured rotating speeds at four continuous moments.
3. The method for improving the success rate of starting the engine according to claim 2, wherein the process of calculating the speed rising rate of the starting acceleration section according to the measured speeds at four consecutive moments is as follows:
calculating the rotating speed increasing rate N (t-3) of the starting acceleration section according to the measured rotating speed N (t) at the moment t, the measured rotating speed N (t-1) at the moment t-1, the measured rotating speed N (t-2) at the moment t-2 and the measured rotating speed N (t-3) at the moment t-3 dot (t)：
In the formula, Δ t represents a time interval.
4. The method for improving the success rate of engine starting according to claim 2, wherein the process of comparing the speed increase rate with the preset speed limit value to determine the distortion interval of the speed signal and correcting the distorted speed by using the speed feedback value comprises the following steps:
if the rate of increase N of the rotation speed at the present moment dot (t) greater than or equal to a predetermined speed limit N dot-D And judging that the rotation speed signal is distorted, and correcting the rotation speed increasing rate at the current moment to obtain a corrected rotation speed N' (t):
N′(t)＝N(t-1)+N dot (t)*Δt。
5. the method for improving engine starting success rate according to claim 4, wherein in the process of comparing the rotating speed increasing rate with the preset rotating speed limit value to determine the distortion interval of the rotating speed signal and correcting the distorted rotating speed by using the rotating speed feedback value, if the rotating speed increasing rate N at the current moment dot (t) is less than the preset rotation speed limit value N dot-D And judging that the rotation speed signal is not distorted, and correcting the rotation speed increasing rate at the current moment is not needed.
6. The method for improving the success rate of engine starting according to claim 4, wherein the process of calculating the fuel amount of the engine starting acceleration section according to the corrected rotating speed and the preset oil-gas ratio of the starting acceleration section and controlling the starting of the engine by using the fuel amount comprises the following steps:
fuel quantity W of engine in start acceleration section f Comprises the following steps:
W f ＝P 3 *f(n R )，
in the formula, P 3 Representing a measured value of compressor outlet pressure, f (n) R ) Representing the gas-oil ratio, n R Representing the relative converted rotation speed;
relative conversion speed n R Comprises the following steps:
in the formula, N D Representing a predetermined physical speed, T 25D Representing a predetermined compressor inlet temperature value, T 25 Representing measured values of compressor inlet temperature, P 25 Representing measured values of compressor inlet pressure, P 0 Represents a standard atmospheric pressure;
and controlling the opening degree of the fuel metering valve according to the relation between the opening degree of the fuel metering valve and the fuel amount to output the corresponding fuel amount, and controlling the starting of the engine by using the fuel amount.
7. An apparatus for increasing engine start success rate, comprising a memory and a controller coupled to the memory, the controller configured to execute a method for increasing engine start success rate according to any one of claims 1-6 based on instructions stored in the memory.
8. A computer storage medium having stored thereon an executable program that, when invoked, performs a method of increasing engine start success rate as claimed in any one of claims 1 to 6.
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