CN113357020B - Control method and system for avoiding afterburning rich oil combustion in afterburning backup process - Google Patents
Control method and system for avoiding afterburning rich oil combustion in afterburning backup process Download PDFInfo
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- CN113357020B CN113357020B CN202110687564.7A CN202110687564A CN113357020B CN 113357020 B CN113357020 B CN 113357020B CN 202110687564 A CN202110687564 A CN 202110687564A CN 113357020 B CN113357020 B CN 113357020B
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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
- F02C9/50—Control of fuel supply conjointly with another control of the plant with control of working fluid flow
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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 belongs to the technical field of engine control, and particularly relates to a control method and system for avoiding afterburning rich oil combustion in an afterburning backup process. The method comprises the steps of S1, determining that an engine meets a forced rotation backup condition; and S2, determining whether the stress application control channel is abnormal or not, if so, directly switching the engine control to a backup control system, otherwise, respectively controlling the stress application internal oil content and the stress application external oil content to be k1 times of the oil content when the backup condition is met within a first set time period, and then switching the engine control to the backup control system. When this application can guarantee that engine afterburning changes backup back can stable work, for the aircraft provides sufficient thrust, promoted the security of aircraft, very big reduction the risk of single distribution assembly, promote the user and use the confidence.
Description
Technical Field
The application belongs to the technical field of engine control, and particularly relates to a control method for avoiding afterburning rich oil combustion in an afterburning backup process.
Background
Generally, for a single engine, the control system of the engine has a set of backup control system completely independent from the main control system. However, in order to ensure a sufficient thrust-weight ratio of the engine, the backup control system is simplified as much as possible on the premise of ensuring that the aircraft can safely return (for example, in order to improve the thrust-weight ratio of the engine, the boosting function, the low-pressure rotating speed/exhaust temperature control function and the like of the backup state control system are cancelled for a certain type of engine). In some cases (such as take-off and formation flight), the engine backup control system is also required to have enough thrust, so as to prevent the main control system from failing to provide enough thrust after being controlled by the backup control system in the take-off and formation flight situations. Therefore, a certain type of engine is specially designed with a force application locking function (namely, after a main control system in a force application state fails, when the main control system is switched to a backup control system, the current force application oil quantity is locked to ensure enough thrust, and the failure state is called as 'force application and backup' for short), so that the thrust requirement in the force application and backup process is ensured. However, since the backup state does not have the low-pressure rotation speed/exhaust temperature control function (only has the high-pressure rotation speed control function), the use state of the engine in the backup state needs to be reduced to ensure that the engine does not over-rotate or over-temperature, which causes the problem that the boosting oil quantity is not matched with the main engine state.
At present, in order to ensure that the boosting oil quantity is matched with the state of a host machine in a backup state after boosting rotation backup, a certain type of engine is controlled by a method of increasing the sealing gap of a boosting locking valve (the boosting oil quantity is gradually reduced along with time), but the method can only provide short-time thrust, the thrust can be continuously reduced along with the continuous reduction of the boosting oil quantity, and the locking time of the boosting oil quantity cannot be accurately controlled.
Disclosure of Invention
In order to solve the technical problem, the application provides a control method and a control system for avoiding boost rich oil combustion in a boost backup process, so that constant and durable thrust is provided while the boost oil quantity is matched with the state of a host machine in boost backup.
The first aspect of the application provides a control method for avoiding boost rich oil combustion in a boost rotation backup process, which mainly comprises the following steps:
step S1, determining that an engine meets the condition of forced rotation backup;
and S2, determining whether the stress application control channel is abnormal or not, if so, directly switching the engine control to a backup control system, otherwise, respectively controlling the stress application internal oil content and the stress application external oil content to be k1 times of the oil content when the backup condition is met within a first set time period, and then switching the engine control to the backup control system.
Preferably, the factor by which the flow rate of the afterburner air is reduced at the time of afterburning backup of the engine is determined as k1 based on the engine simulation calculation model.
Preferably, a second decreasing rate of the inlet air flow of the afterburner after the boost state backup is performed is determined through a statistical or computational method, and a first decreasing rate of controlling the boost internal oil content and the boost external oil content to k1 times of the oil content when the backup condition is met is lower than the second decreasing rate within the first set time period.
Preferably, the first set period of time is from 0.4 to 0.6s, k1 being taken from any value of from 0.8 to 0.9.
Preferably, the first set period of time is 0.5s, k1 being 0.8.
The second aspect of the present application provides a control system for avoiding boost rich oil combustion in the boost rotation backup process, which mainly comprises:
the state determination module is used for determining that the engine meets the condition of forced rotation backup;
and the switching module is used for determining whether the stress application control channel is abnormal or not, directly switching the engine control to the backup control system if the stress application control channel is abnormal, otherwise, respectively controlling the stress application internal oil content and the stress application external oil content to be k1 times of the oil content when the backup condition is met within a first set time period, and then switching the engine control to the backup control system.
Preferably, k1 is determined as the multiple of the reduction of the afterburner air flow rate at the time of afterburning backup of the engine, based on an engine simulation calculation model.
Preferably, a second descending rate of the inlet air flow of the afterburner after afterburning state backup is determined by a statistical or calculation method, and a first descending rate of the afterburning oil content and the afterburning oil content which are k1 times of the oil content when the backup condition is met is controlled to be lower than the second descending rate within a first set time period.
Preferably, the first set period of time is from 0.4 to 0.6s, k1 being taken from any value of from 0.8 to 0.9.
Preferably, the first set period of time is 0.5s, k1 being 0.8.
When this application can guarantee that engine afterburning changes backup back can stable work, for the aircraft provides sufficient thrust, promoted the security of aircraft (especially single-engine aircraft), very big reduction the risk of single-engine assembly, promote the user and use the confidence.
Drawings
Fig. 1 is a flowchart of a preferred embodiment of the control method for avoiding boost rich combustion during boost backup according to the present application.
Detailed Description
In order to make the implementation objects, technical solutions and advantages 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 embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application, and should not be construed as limiting the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making creative efforts shall fall within the protection scope of the present application. Embodiments of the present application will be described in detail below with reference to the drawings.
In a first aspect, the present application provides a control method for avoiding boost rich combustion during a boost backup process, as shown in fig. 1, mainly including:
s1, determining that an engine meets a forced rotation backup condition;
and S2, determining whether the stress application control channel is abnormal or not, if so, directly switching the engine control to a backup control system, otherwise, respectively controlling the stress application internal oil content and the stress application external oil content to be k1 times of the oil content when the backup condition is met within a first set time period, and then switching the engine control to the backup control system.
It should be noted that, during boost rotation backup, under the condition that a boost control loop of the main control system can also control (the fault rate of boost related control accessories is extremely low), the main control system firstly performs a certain degree of down-regulation on boost oil supply, and when the boost oil supply reaches the range within which the engine can stably work, the boost oil supply is locked through a boost locking valve. Therefore, the engine can provide sufficient thrust while the working stability of the engine is ensured.
Generally, after the afterburning backup, whether the engine can stably work or not depends on whether the oil-gas ratio of an afterburner is proper or not. The method mainly comprises two aspects of the speed of the boost oil quantity reduction (the slow reduction of the boost oil quantity can cause rich combustion in a boost combustion chamber and unstable combustion), the fast reduction of the boost oil quantity can cause flameout of the boost combustion chamber or large nozzle fluctuation to cause disturbance to the control of a host machine) and the final target value of the boost oil quantity. Therefore, it is necessary to design separately.
1. Design of final magnitude of stress oil
According to the calculation of an engine simulation calculation model, the air flow of an afterburner is reduced to k1 times (k 1 takes a value of 0.8-0.9) when the engine is in an afterburning backup, so that the afterburning oil quantity needs to be reduced to k1 times after the afterburning backup.
2. Design of forced oil quantity decreasing rate
First, a parameter representative of the afterburner inlet air flow needs to be determined; secondly, in the embodiment, a second descending rate of the inlet air flow of the afterburner after afterburning state backup is determined through a statistical or calculation method, and a first descending rate of controlling the afterburning oil content and the afterburning oil content to be k1 times of the oil content when the backup condition is met is lower than the second descending rate in the first set time period
The determination of the compressor outlet pressure P31 can be used as a substitute parameter for the air flow of the afterburner, based on existing parameters measured by the engine. When the engine is backed up by force application, P31 is reduced to k1 times within t1 (about 0.5 s) seconds. Therefore, it is necessary to design the decreasing rate of the amount of energizing oil to decrease to k1 times in t1 seconds.
In some alternative embodiments, the first set period of time is between 0.4 and 0.6s, and k1 is taken from any one of values between 0.8 and 0.9.
In some alternative embodiments, the first set time period is 0.5s, k1 is 0.8.
The specific control logic of the present application is therefore as follows:
a) Controlling conditions
The stress application backup condition is met;
b) And (3) treatment:
the state of the engine host is transferred to a backup control system; the boosting oil quantity is controlled according to the following requirements:
when the stress application control channel is abnormal, the backup control is directly performed;
when the stress application control channels are normal, the stress application oil content is controlled to k1 times (k 1 is less than 1) the oil content when the backup condition is met within t1 seconds; controlling the oil mass in t1 s to k1 times (k 1 is less than 1) of the oil mass when the backup condition is met; and then transfer to backup control.
The application provides a control method for avoiding forced fuel rich combustion in a forced transfer backup control process. The control method can ensure that the engine can stably work after power-assisted rotation backup, and simultaneously provides enough thrust for the airplane, improves the safety of the airplane (especially a single-engine airplane), greatly reduces the risk of single-engine assembly, and improves the use confidence of a user.
The second aspect of the present application provides a control system for avoiding boost rich oil combustion in the boost rotation backup process, which mainly comprises:
the state determining module is used for determining that the engine meets the condition of forced rotation backup;
and the switching module is used for determining whether the stress application control channel is abnormal or not, if so, directly switching the engine control to the backup control system, otherwise, respectively controlling the stress application internal oil content and the stress application external oil content to be k1 times of the oil content when the backup condition is met within a first set time period, and then switching the engine control to the backup control system.
In some alternative embodiments, the multiple of the decrease in afterburner airflow at the time of the engine at the afterburner backup is determined as k1 based on an engine simulation calculation model.
In some optional embodiments, a second decreasing rate of the inlet air flow of the afterburner after the boost state backup is performed is determined through a statistical or calculation method, and a first decreasing rate of controlling the boost oil content and the boost oil content to be k1 times of the oil content when the backup condition is met is lower than the second decreasing rate in the first set time period.
In some alternative embodiments, the first set period of time is between 0.4 and 0.6s, and k1 is taken from any one of values between 0.8 and 0.9.
In some alternative embodiments, the first set period of time is 0.5s, and k1 is 0.8.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. A control method for avoiding forced rich oil combustion in a forced transfer backup process is characterized by comprising the following steps:
s1, determining that an engine meets a forced rotation backup condition;
s2, determining whether the stress application control channel is abnormal or not, if so, directly switching the engine control to a backup control system, otherwise, respectively controlling the stress application internal oil content and the stress application external oil content to be k1 times of the oil content when the backup condition is met within a first set time period, and then switching the engine control to the backup control system;
wherein the first set period of time is 0.4-0.6s, k1 is taken from any value of 0.8-0.9.
2. The control method for avoiding afterburner rich combustion during afterburner backup as claimed in claim 1, wherein k1 is defined as a multiple of reduction in afterburner air flow rate at the time of afterburner backup based on an engine simulation calculation model.
3. The control method for avoiding forced fuel rich combustion in the forced fuel transfer backup process as claimed in claim 1, wherein a second rate of decrease of inlet air flow of the forced combustion chamber after the forced state transfer backup is performed is determined by a statistical or computational method, and a first rate of decrease for controlling forced oil inclusion and forced oil inclusion until k1 times of oil amount when backup conditions are satisfied is lower than the second rate of decrease during the first set time period.
4. The control method for avoiding forced fuel rich combustion in the forced transfer backup process as claimed in claim 1, wherein the first set time period is 0.5s, and k1 is 0.8.
5. A control system for avoiding afterburning rich oil combustion in an afterburning backup process is characterized by comprising:
the state determining module is used for determining that the engine meets the condition of forced rotation backup;
the switching module is used for determining whether the stress application control channel is abnormal or not, if so, directly switching the engine control to the backup control system, otherwise, respectively controlling the stress application internal oil content and the stress application external oil content to be k1 times of the oil content when the backup condition is met within a first set time period, and then switching the engine control to the backup control system;
wherein the first set period of time is 0.4-0.6s, k1 is taken from any value of 0.8-0.9.
6. The control system for avoiding afterburner rich combustion during afterburner backup as claimed in claim 5, wherein k1 is determined as the multiple of decrease in afterburner air flow at the time of afterburner backup based on an engine simulation calculation model.
7. The control system for avoiding forced fuel rich combustion in the forced fuel transfer backup process according to claim 5, wherein a second decreasing rate of the inlet air flow of the forced combustion chamber after the forced fuel transfer backup is performed is determined by a statistical or computational method, and a first decreasing rate for controlling the forced oil content and the forced oil content to be transferred to k1 times of the oil content when the backup condition is satisfied is lower than the second decreasing rate in the first set time period.
8. The control system for avoiding forced rich combustion during forced turn back-up as claimed in claim 5, wherein the first set time period is 0.5s, and k1 is 0.8.
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| US6823675B2 (en) * | 2002-11-13 | 2004-11-30 | General Electric Company | Adaptive model-based control systems and methods for controlling a gas turbine |
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- 2021-06-21 CN CN202110687564.7A patent/CN113357020B/en active Active
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| RU2009102885A (en) * | 2009-01-29 | 2010-08-10 | Открытое акционерное общество "СТАР" (RU) | METHOD FOR GAS-TURBINE ENGINE CONTROL WITH FORCING COMBUSTION CHAMBER |
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