CN112065592B - Acceleration control method for avoiding engine surge under insufficient warm-up condition - Google Patents

Acceleration control method for avoiding engine surge under insufficient warm-up condition Download PDF

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CN112065592B
CN112065592B CN202010813510.6A CN202010813510A CN112065592B CN 112065592 B CN112065592 B CN 112065592B CN 202010813510 A CN202010813510 A CN 202010813510A CN 112065592 B CN112065592 B CN 112065592B
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engine
warm
warmed
warming
state
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CN112065592A (en
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吉思环
李焦宇
刘亚君
曲山
杨怀丰
赵明阳
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AECC Shenyang Engine Research Institute
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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
    • F02C9/26—Control of fuel supply
    • F02C9/28—Regulating systems responsive to plant or ambient parameters, e.g. temperature, pressure, rotor speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2270/00—Control
    • F05D2270/30—Control parameters, e.g. input parameters
    • F05D2270/304—Spool rotational speed

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

The application provides an acceleration control method for avoiding engine surge under the condition of insufficient warm-up, which comprises the following steps: identifying whether the engine is sufficiently warmed up, wherein when the continuous duration time that the rotating speed of the high-pressure rotor is greater than the lowest warming-up rotating speed is greater than a first time, the engine is judged to be sufficiently warmed up, and when the continuous duration time that the rotating speed of the high-pressure rotor is lower than the lowest warming-up rotating speed is greater than a second time, the engine is judged to be insufficiently warmed up; in the process of fully warming up the engine from insufficient warming up, the accelerated oil quantity of the engine is switched and divided into a plurality of stages, wherein the stages comprise a warming-up entering stage, a warming-up executing stage, a warming-up exiting stage and an unwarming stage; and controlling the acceleration oil quantity of the engine according to different stages. The acceleration process control method for avoiding the engine surge under the condition of insufficient warm-up can ensure the working stability of the engine when the engine is not warmed up sufficiently, and can also ensure that the acceleration performance of the engine after the engine is sufficiently warmed up meets the requirement.

Description

Acceleration control method for avoiding engine surge under insufficient warm-up condition
Technical Field
The application belongs to the technical field of aero-engine control, and particularly relates to an acceleration control method for avoiding engine surge under the condition of insufficient warm-up.
Background
Under the condition that the atmospheric temperature of the aircraft engine is low and the aircraft engine is not fully warmed up (the stability margin of the engine is reduced), the problem of surging can occur when the engine with the low stability margin is pushed up to a warming-up step from a slow vehicle.
In the traditional acceleration control method, whether the warming-up is sufficient or not, the control can be carried out only according to the same set of accelerated oil supply, so that the surge problem is caused when the engine with sufficient warming-up is accelerated to meet the requirement and the engine with small stability margin is insufficiently warmed up; or sacrifice the acceleration performance after the engine is sufficiently warmed up in order to ensure the operational stability of the engine with a small margin of stability when the engine is not sufficiently warmed up.
Disclosure of Invention
It is an object of the present application to provide an acceleration control method for avoiding engine surge under insufficiently warmed-up conditions to solve or alleviate at least one of the problems described above.
The technical scheme of the application is as follows: an acceleration control method for avoiding engine surge under an insufficiently warmed-up condition, comprising:
identifying whether the engine is sufficiently warmed up, wherein when the continuous duration time that the rotating speed of the high-pressure rotor is greater than the lowest warming-up rotating speed is greater than a first time, the engine is judged to be sufficiently warmed up, and when the continuous duration time that the rotating speed of the high-pressure rotor is lower than the lowest warming-up rotating speed is greater than a second time, the engine is judged to be insufficiently warmed up;
in the process of fully warming up the engine from insufficient warming up, the accelerated oil quantity of the engine is switched and divided into a plurality of stages, wherein the stages comprise a warming-up entering stage, a warming-up executing stage, a warming-up exiting stage and an unwarming stage;
and controlling the acceleration oil quantity of the engine according to different stages.
In the application, an engine non-warm state identifier is constructed, and when the identifier is effective, the engine needs to be warmed; when the flag is invalid, it indicates that the engine has warmed up to the point or does not need to be warmed up.
In the present application, when the un-warmed state flag is switched from active to inactive, the condition is satisfied: a or b or c or (d and e);
wherein the conditions are as follows:
a) the rotating speed of the high-pressure rotor is larger than or equal to the rotating speed of the warming-up for a certain time, namely the flag TimEN2GEN2NJ of the sufficient warming-up mark is 1;
b) the engine enters an intermediate state or a stress application state;
c) the landing gear is in a stowed signal;
d) the engine is in an initial or stopped state;
e) the exhaust temperature T6 has no fault, the total intake temperature T1 has no fault, and the exhaust temperature T6-total intake temperature T1 is more than or equal to the rated temperature difference delta T.
In the present application, when the un-warmed state flag is switched from invalid to valid, the condition is satisfied: a and b and ((c and d) or e);
a) the logic selection identifier Flash _ FlagNeedNJ is 1;
b) the landing gear is in a down signal;
c) the engine is in an initial or stopped state;
d)“T6no fault and T1No fault and T6-T1＜△T；
e)FlagTimeN2LTN2NJ＝1。
In this application, in the switching process of the acceleration oil amount, the switching of the warm-up exiting stage or the non-warm-up stage to the warm-up entering stage needs to meet the conditions: a and b and c and d;
a)T1≤△1
b) the "not warmed up state" flag is valid;
c) the engine is in a slow running state or above;
d)tworking time of warm-up<TConversion。
In this application, in the switching process of the acceleration oil amount, the switching of the warm-up execution stage or the warm-up entering stage to the warm-up exiting stage needs to satisfy the conditions: (a and b) or c or d;
a) the "not warmed up state" flag is invalid;
b)tworking time of warm-up>0；
c) The engine is in a stopped or initial state;
d) the engine is in the process of starting.
In this application, the control law of the engine acceleration oil quantity in different stages is:
Wfacc＝Wfaccis normal×(1－(1-k2)×tWorking time of warm-up/TConversion)
In the formula: k2 is the fuel supply coefficient of the main fuel acceleration fuel supply regular warming machine; t isConversionTo the conversion time; wfaccIs normalNormal acceleration oil supply rules; wfacc is the corrected accelerated oil supply law.
In the application, the main fuel oil acceleration fuel supply rule warm-up fuel supply coefficient k2 is larger than the multiple k of the steady-state fuel quantity and the acceleration fuel quantity of the engine.
The acceleration process control method for avoiding the engine surge under the condition of insufficient warm-up can ensure the working stability of the engine when the engine is not warmed up sufficiently, and can also ensure that the acceleration performance of the engine after the engine is sufficiently warmed up meets the requirement.
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 embodiments of the present application.
In the prior art, after the accelerated oil quantity of a surging bench engine is reduced, the problem of step surging of a slow vehicle push-up heating machine can be effectively solved. Due to the same set of acceleration oil supply rules adopted before and after warming, the problem that the acceleration performance of the engine is slow even after the engine is sufficiently warmed is caused. Under such a background, an acceleration control method for avoiding engine surge under an insufficient warm-up condition is proposed to solve the contradiction between the stability requirement during insufficient warm-up and the acceleration requirement after sufficient warm-up.
The technical problem that the acceleration control method for avoiding the engine surge under the insufficient warm-up condition mainly solves is as follows: when the engine is not sufficiently warmed up, how to properly reduce the acceleration oil quantity and ensure the working stability of the engine, and when the engine is sufficiently warmed up, how to improve the acceleration oil quantity to a normal value so as to ensure that the acceleration performance of the engine meets the requirement.
In order to solve the above problems, the following problems need to be considered:
1. how to recognize whether the engine is sufficiently warmed up;
2. how to ensure the stable operation of the engine when the accelerated oil quantity is switched;
3. accelerating the oil quantity reduction value when the engine is not fully warmed up, wherein the engine cannot maintain a corresponding state due to an overlarge reduction value; the problem of engine surge cannot be effectively solved if the reduction amount is too small.
Determination of whether warm-up is sufficient
According to statistics of engine test data, the problem of surge of too-slow vehicle push-up warm-up machine does not occur after the engine is warmed up according to normal warm-up time requirements.
Therefore, in the present application, at high rotor speeds
Figure GDA0003248710250000041
The time continuously greater than the minimum warm-up rotating speed is greater than a first specified time, namely the engine is considered to be sufficiently warmed up;
in addition, when the external field is used, although the engine is sufficiently warmed up, the engine may stay at the warm-up rotation speed for a long time, and the engine may be cooled. Therefore, will
Figure GDA0003248710250000042
The time continuously below the minimum warm-up rotation speed is longer than a second prescribed time, i.e., the engine is considered to be insufficiently warmed up.
High pressure rotor speed
Figure GDA0003248710250000043
At this time, the warm-up time (timeN2GEN2NJ) is started,
Figure GDA0003248710250000044
when time is reached, timeN2GEN2NJ is timed out.
If timeN2GEN2NJ reaches a certain time, the warm-up sufficient flag (FlagTimeN2GEN2NJ) is 1, otherwise, FlagTimeN2GEN2NJ is 0.
Slow vehicle and above state
Figure GDA0003248710250000045
At this time, the cold time (timeN2LTN2NJ) starts to count,
Figure GDA0003248710250000046
or the state below slow, timeN2LTN2NJ is cleared.
If timeN2LTN2NJ reaches a certain time, the refrigerator identifier (FlagTimeN2LTN2NJ) is 1, otherwise, FlagTimeN2LTN2NJ is 0.
Setting an unheated state identifier: when the flag is valid, it indicates that the engine needs to be warmed up; when the flag is invalid, it indicates that the engine has warmed up to the point or does not need to be warmed up.
If the current engine 'non-warm state' is effective and the following conditions are met, setting the engine 'non-warm state' as invalid:
a)FlagTimeN2GEN2NJ＝1；
b) the engine enters an intermediate state or a stress application state;
c) the landing gear is in a stowed signal;
d) the engine is in an initial or stopped state;
e) exhaust temperature (T)6) No fault, and total intake air temperature (T)1) No fault, and T6-T1≥△T；
Note 1: the condition relation is as follows: a or b or c or (d and e);
note 2: t is1、T6At fault, then T6-T1<ΔT holds.
If the current engine 'non-warm state' is invalid and the following conditions are met, setting the engine 'non-warm state' as valid:
a) the logic selection identifier Flash _ FlagNeedNJ is 1;
b) the landing gear is in a down signal;
c) the engine is in an initial or stopped state;
d)“T6no fault and T1No fault and T6-T1＜△T；
e)FlagTimeN2LTN2NJ＝1；
Note 1: the condition relation is as follows: a and b and ((c and d) or e);
note 2: t is1、T6At fault, then T6-T1<ΔT holds.
When the controller is powered on, if Flash _ FlagNeedNJ is equal to 1, the 'non-warm-up state' is set to be effective, otherwise, the 'non-warm-up state' is set to be ineffective.
Secondly, accelerating the switching of oil quantity
Considering that the change of the acceleration oil amount may cause the fluctuation of the engine parameters, the acceleration control method needs to be added with a conversion logic which performs slow transition according to a certain time.
The warm-up operation state is set, and is classified into a "warm-up entry state", a "warm-up execution state", a "warm-up exit state", and a "normal (non-warm-up) state". At the same time set up warmMachine working time counter tWorking time of warm-upThe initial value is set to 0 s. The warm-up state is set according to the following logic:
1) when the warmed-up operating state is the "warmed-up exiting state" or the "normal (non-warmed-up) state", the warmed-up operating state is set to the "warmed-up entering state" if the following conditions (a and b and c and d) are satisfied:
a)T1≤△1(satisfy b and c and d are judged)
b) The "not warmed up state" flag is valid;
c) the engine is in a slow running state or above;
d)tworking time of warm-up<TConversion。
2) When the warm-up working state is the 'warm-up entering state', if tWorking time of warm-up≥TConversionSetting the warm-up working state as a warm-up execution state;
3) when the warm-up operation state is a "warm-up execution state" or a "warm-up entering state", the warm-up operation state is set to a "warm-up exiting state" when the following condition "(a and b) or c or d" is established;
a) the "not warmed up state" flag is invalid;
b)tworking time of warm-up>0；
c) The engine is in a stopped or initial state;
d) the engine is in the process of starting.
4) When the warm-up working state is the 'warm-up exit state', if tWorking time of warm-upSetting the warm-up working state to be a normal (non-warm-up) state when the temperature is less than or equal to 0;
and 5, when the controller is electrified, setting the warm-up working state as a normal (non-warm-up) state.
Thirdly, accelerating the reduction value of the oil quantity when the engine is not fully warmed up
Normally, the steady-state oil quantity of the engine is not more than a certain multiple k (less than 1) of the acceleration oil quantity. When the problem of insufficient surge due to un-heating occurs in the external field, the acceleration oil amount is reduced to a constant multiple k2 (the multiple k is less than 1, and k2> k is ensured) by the down-regulated acceleration oil amount value.
The warm-up control is executed as follows:
a) when the warm-up operation state is a "warm-up entering state", tWorking time of warm-upAccumulating and timing;
b) when the warm-up operation state is the "warm-up execution state", tWorking time of warm-upStopping accumulation and keeping unchanged;
c) when the warm-up operation state is a' warm-up exit stateWorking time of warm-upDecreasing with time (setting t directly if the engine is in the process of starting)Working time of warm-up＝0)；
d) When the warm-up operation state is a "normal (non-warm-up) state", the counter t is setWorking time of warm-upStopping decreasing and keeping unchanged;
e) under all warm-up operating conditions, all set up the main fuel oil accelerated fuel feeding law through the restriction and do: wfacc ═ WfaccIs normal×(1－(1-k2)×tWorking time of warm-up/TConversion)
In the formula: k2 is the fuel supply coefficient of the main fuel acceleration fuel supply regular warming machine; t isConversionTo the conversion time; wfaccIs normalNormal acceleration oil supply rules; wfacc is the corrected accelerated oil supply law.
The acceleration process control method for avoiding the engine surge under the condition of insufficient warm-up can guarantee the working stability of the engine when the engine is not warmed up sufficiently, can also guarantee the acceleration performance of the engine after the engine is sufficiently warmed up to meet the requirements, and finally can reduce the troubleshooting workload of the engine caused by the surge problem and save resources.
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. An acceleration control method for avoiding engine surge under an insufficiently warmed-up condition, comprising:
identifying whether the engine is sufficiently warmed up, wherein when the continuous duration time that the rotating speed of the high-pressure rotor is greater than the lowest warming-up rotating speed is greater than a first time, the engine is judged to be sufficiently warmed up, and when the continuous duration time that the rotating speed of the high-pressure rotor is lower than the lowest warming-up rotating speed is greater than a second time, the engine is judged to be insufficiently warmed up;
in the process of fully warming up the engine from insufficient warming up, the accelerated oil quantity of the engine is switched and divided into a plurality of stages, wherein the stages comprise a warming-up entering stage, a warming-up executing stage, a warming-up exiting stage and an unwarming stage;
and controlling the acceleration oil quantity of the engine according to different stages.
2. An acceleration control method to avoid engine surge under insufficiently warmed-up conditions as in claim 1, characterized by constructing an engine unheated state flag indicating that the engine needs to be warmed up when the flag is valid; when the flag is invalid, it indicates that the engine has warmed up to the point or does not need to be warmed up.
3. An acceleration control method of avoiding engine surge under insufficiently warmed-up conditions according to claim 2, characterized in that when the identification of the state of un-warmed-up is switched from active to inactive, the condition is satisfied: a or b or c or (d and e);
wherein the conditions are as follows:
a) the rotating speed of the high-pressure rotor is larger than or equal to the rotating speed of the warming-up for a certain time, namely the flag TimEN2GEN2NJ of the sufficient warming-up mark is 1;
b) the engine enters an intermediate state or a stress application state;
c) the landing gear is in a stowed signal;
d) the engine is in an initial or stopped state;
e) the exhaust temperature T6 has no fault, the total intake temperature T1 has no fault, and the exhaust temperature T6-total intake temperature T1 is more than or equal to the rated temperature difference delta T.
4. An acceleration control method of avoiding engine surge under insufficiently warmed-up conditions according to claim 3, characterized in that when the identification of the state of non-warmed-up is switched from inactive to active, the condition is fulfilled: a and b and ((c and d) or e);
a) the logic selection identifier Flash _ FlagNeedNJ is 1;
b) the landing gear is in a down signal;
c) the engine is in an initial or stopped state;
d)“T6no fault and T1No fault and T6-T1＜△T；
e)FlagTimeN2LTN2NJ＝1。
5. An acceleration control method of avoiding engine surge under insufficient warm-up conditions as set forth in claim 4, characterized in that in the accelerated oil amount switching process, the condition is satisfied when the warm-up exit phase or the un-warm-up phase is switched to the warm-up entry phase: a and b and c and d;
a)T1≤△1
b) the "not warmed up state" flag is valid;
c) the engine is in a slow running state or above;
d)tworking time of warm-up<TConversion。
6. An acceleration control method of avoiding engine surge under an insufficient warming-up condition as set forth in claim 5, wherein in the accelerated oil amount switching process, the condition is satisfied when the warm-up execution stage or the warm-up entering stage is switched to the warm-up exiting stage: (a and b) or c or d;
a) the "not warmed up state" flag is invalid;
b)tworking time of warm-up>0；
c) The engine is in a stopped or initial state;
d) the engine is in the process of starting.
7. The accelerated control method for avoiding the surge of the engine under the condition of insufficient warm-up as claimed in claim 1, wherein the control law of the accelerated oil quantity of the engine in different stages is as follows:
Wfacc＝Wfaccis normal×(1－(1-k2)×tWorking time of warm-up/TConversion)
In the formula: k2 is the fuel supply coefficient of the main fuel acceleration fuel supply regular warming machine; t isConversionTo the conversion time; wfaccIs normalNormal acceleration oil supply rules; wfacc is the corrected accelerated oil supply law.
8. An acceleration control method to avoid engine surge under inadequate warm-up conditions as set forth in claim 7 wherein the main fuel accelerated fueling regular warm-up fueling factor k2 is greater than the multiple k of the steady state fuel volume and the accelerated fuel volume of the engine.
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