CN109441645A - A kind of fuel flow control method starting auxiliary power unit APU - Google Patents
A kind of fuel flow control method starting auxiliary power unit APU Download PDFInfo
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- CN109441645A CN109441645A CN201811510207.8A CN201811510207A CN109441645A CN 109441645 A CN109441645 A CN 109441645A CN 201811510207 A CN201811510207 A CN 201811510207A CN 109441645 A CN109441645 A CN 109441645A
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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
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Feedback Control In General (AREA)
Abstract
The present invention provides a kind of fuel flow control methods for starting auxiliary power unit APU, and method includes: to preset transition state fuel flow algorithm, stable state fuel flow algorithm, final output fuel flow selection algorithm；The fuel flow in auxiliary power unit starting process is determined according to the final output fuel flow selection algorithm.
Description
Technical field
The invention belongs to aero-engine digital control technology fields, specially a kind of to start auxiliary power unit APU's
Fuel flow control method.
Background technique
It is not especially multiple for control auxiliary power unit (Auxiliary Power Unit is abbreviated as APU) this class formation
Miscellaneous small turbine engine uses FADEC system although being also able to satisfy the basic demand of control using mechanical-hydraulic controller
System has many apparent advantages: under the premise of having same control ability, volume and weight obviously subtracts compared with mechanical hydraulic-pressure type
It is small；Using computer as computing device may be implemented various complicated and advanced control algolithm and control laws, can obtain
Better performance index and control precision；The modification and update of control software, algorithm just only can be completed by modifying code, it is convenient
The design and application of control system；The various limitations and safeguard measure, failure logging and warning lamp of control system are able to achieve, are improved
The applicability of APU.
Traditional APU fuel oil control method is the control method based on APU acceleration curve, under different operating conditions, letter
Single acceleration curve is difficult to adapt to biggish flight envelope, often unable to do what one wants very much to do, and the starting time is longer, exhaust temperature
Degree is high, it is difficult to meet starting characteristic and engine demand；In addition, conventional method is generally using fixation when calculating fuel flow
PI parameter regulation, simple several groups of PI parameters are difficult to adapt to biggish flight envelope.
Summary of the invention
The fuel flow control method provided by the invention for starting auxiliary power unit APU, is able to solve under different operating conditions
The starting fuel feeding problem of APU.
The present invention provides a kind of fuel flow control method for starting auxiliary power unit APU, method includes:
Preset transition state fuel flow algorithm, stable state fuel flow algorithm, final output fuel flow selection algorithm；
The fuel oil stream in auxiliary power unit starting process is determined according to the final output fuel flow selection algorithm
Amount.
Optionally, described to preset transition state fuel flow algorithm, stable state fuel flow algorithm, final output fuel oil stream
Selection algorithm is measured, is specifically included:
If revolving speed < 80% of the APU, the final output fuel flow selection algorithm is transition state fuel flow
Algorithm；
If 98% < APU revolving speed≤100%, the final output fuel flow selection algorithm are stable state fuel flows
Algorithm；
If 80%≤APU revolving speed≤98%, it is worth when according to the transition state fuel flow algorithm is calculated less than root
When value calculated according to the stable state fuel flow algorithm, the final output fuel flow selection algorithm is the transition state combustion
Oil stream quantity algorithm；It is more than or equal to when according to the calculated value of the transition state fuel flow algorithm according to the stable state fuel flow
When the calculated value of algorithm, the final output fuel flow selection algorithm is the stable state fuel flow algorithm.
Optionally, the transition state fuel flow algorithm includes: control algolithm, transition state of the transition state based on delivery temperature
Adaptive PI parameter algorithm, transition state fuel flow limit algorithm；
The stable state fuel flow algorithm includes: stable state constant rotational speed closed loop PI control algolithm, the limitation of stable state fuel flow
Algorithm.
Optionally, control algolithm of the transition state based on delivery temperature, transition state adaptive PI parameter algorithm, transition state
Fuel flow limit algorithm, specifically includes:
According to current APU revolving speed, current inlet pressure P2Determine the expectation delivery temperature under current APU revolving speed；
Calculate the actual exhaust air temperature T under current APU revolving speed5With the expectation delivery temperature T under the current APU revolving speed5 *
Current Temperatures deviation；
According to current inlet temperature T2, the current inlet pressure P2Calculate current adaptive proportionality coefficient P and current adaptive
Answer integral coefficient I；
According to the current APU revolving speed, current inlet temperature T2, the current inlet pressure P2, calculate the combustion of current transition state
Oil stream amount limits upper limit wf-t-max and current transition state fuel flow limits lower limit wf-t-min；
It is calculated according to the Current Temperatures deviation, current adaptive proportionality coefficient P and current Adaptive Integral coefficient I current
Transition state fuel flow wf-t；
If the wf-t >=the wf-t-max, exporting transition state fuel flow wf-t-out is wf-t-max；
If the wf-t≤the wf-t-min, exporting transition state fuel flow wf-t-out is wf-t-min；
If the wf-t-min < wf-t < wf-t-max, exporting transition state fuel flow wf-t-out is wf-t.
Optionally, the stable state constant rotational speed closed loop PI control algolithm, stable state fuel flow limit algorithm specifically include:
Current rotating speed deviation is calculated according to current APU revolving speed and expectation revolving speed, the expectation revolving speed is preset parameter；
Current steady state fuel flow wf-s is calculated according to the current rotating speed deviation, proportionality coefficient P, integral coefficient I, it is described
Proportionality coefficient P, integral coefficient I are preset parameter；
According to the current APU revolving speed, current inlet temperature T2, current inlet pressure P2, calculate current steady state fuel flow
Upper limit wf-s-max and current steady state fuel flow lower limit wf-s-min；
If the wf-s >=the wf-s-max, exporting transition state fuel flow wf-s-out is wf-s-max；
If the wf-s≤the wf-s-min, exporting transition state fuel flow wf-s-out is wf-s-min；
If the wf-s-min < wf-s < wf-s-max, exporting transition state fuel flow wf-s-out is wf-s.
It is an object of the invention to solve the problems, such as the starting fuel feeding of APU under different operating conditions, in starting process, APU is adjusted
Fuel flow in starting process supplies adaptable fuel flow.In entire starting process, fuel supply flow rate that the present invention controls
It is almost the same with APU demand fuel flow, be not in that fuel oil is too large or too small and to influence oil-gas ratio, starting time, heat outstanding
It hangs, avoids the occurrence of overtemperature, excess revolutions, even starting failure.
The present invention presets transition state fuel flow algorithm, stable state fuel flow algorithm, and the selection of final output fuel oil is calculated
Method determines the output fuel flow in auxiliary power unit starting process according to final output fuel oil selection algorithm, and solution is never
With the fuel flow control problem under operating condition in APU starting process, the fuel flow of adaptation is supplied in starting process, control
Fuel delivery needs oil mass almost the same with APU, be not in fuel flow it is too large or too small and influence oil-gas ratio, the starting time,
Heat suspension, avoids the occurrence of overtemperature, excess revolutions, even starting failure, it can be ensured that the safe handling of APU, the economic performance of fuel oil
Enough extend the service life of APU.Meanwhile transition state fuel flow algorithm include: control algolithm of the transition state based on delivery temperature,
Transition state adaptive PI parameter algorithm, transition state fuel flow limit algorithm can be under different operating conditions, it is ensured that delivery temperature is not
Overtemperature adjusts PI parameter, the fuel flow that output is adapted with APU in real time；Stable state fuel flow algorithm includes: constant turn of stable state
Fast closed loop PI control algolithm, stable state fuel flow limit algorithm, the fuel flow that output is adapted with APU, it is ensured that APU revolving speed is not
Excess revolutions.The present invention can ensure that in entire starting process APU not overtemperature, not excess revolutions, can adapt to bigger flight envelope, to system
Environmental suitability it is stronger.
Detailed description of the invention
Fig. 1 is the final output fuel flow selection algorithm schematic diagram that the embodiment of the present invention proposes；
Fig. 2 is the transition state fuel flow algorithm schematic diagram that the embodiment of the present invention proposes；
Fig. 3 is the transition state adaptive PI parameter algorithm schematic diagram that the embodiment of the present invention proposes；
Fig. 4 is the stable state fuel flow algorithm schematic diagram that the embodiment of the present invention proposes.
Specific embodiment
The present invention is calculated using transition state fuel flow algorithm, stable state fuel flow algorithm, the selection of final output fuel flow
Method adjusts the fuel flow in control auxiliary power unit (Auxiliary Power Unit is abbreviated as APU) starting process, purport
Fuel flow control problem in the case where solving different operating conditions in APU starting process, supplies adaptable fuel oil in starting process
Flow, be not in fuel oil it is too large or too small and influence oil-gas ratio, the starting time, heat suspension, even starting failure.
Wherein, transition state fuel flow algorithm includes that control algolithm, transition state of the transition state based on delivery temperature are adaptive
The algorithm of PI parameter, transition state fuel flow limit algorithm；Stable state fuel flow algorithm includes stable state constant rotational speed closed loop PI control
Algorithm processed, stable state fuel flow limit algorithm, it is ensured that APU not overtemperature, not excess revolutions in entire starting process.
Embodiment one
The present invention is specially the fuel flow control method started during APU, final output fuel flow selection algorithm
(as shown in Figure 1), adopts the following technical scheme that
1.APU remains static, and after receiving starting order, when APU revolving speed APU_N reaches N1, APU igniter adds
Electricity；
2. main fuel valve is powered when APU revolving speed APU_N reaches N2, main fuel oil circuit output main fuel oil circuit is connected
Fuel flow, final output fuel flow are selected as transition state fuel flow, and wherein Fig. 2 is transition state fuel flow algorithm, Fig. 3
For transition state adaptive PI parameter algorithm；
3. electric under APU igniter when APU revolving speed APU_N reaches N3；
4. then final output fuel flow is selected as transition state fuel flow and output when PU revolving speed APU_N reaches N4
The minimum value of stable state fuel flow, wherein Fig. 4 is stable state fuel flow algorithm；
5. APU starting control process terminates when APU revolving speed APU_N reaches N5, it is transferred to the control of stable state fuel oil, then most
Output fuel flow is selected as stable state fuel flow algorithm eventually.
Embodiment two
The fuel flow control method started during APU to the present invention is described in detail with reference to the accompanying drawings and examples,
Final output fuel flow selection algorithm (as shown in Figure 1).
Embodiment step and relevant parameter are as follows:
1.APU remains static, after receiving starting order, when APU revolving speed APU_N reaches 2%, and APU igniter
Power-up；
2. main fuel valve is powered when APU revolving speed APU_N reaches 5%, main fuel oil circuit output main fuel oil circuit is connected
Fuel flow, final output fuel flow are selected as transition state fuel flow wf-t-out, wherein wf-t-out=FTransition state(APU_
N, P2、T2、T5 *、T5), transition state fuel flow algorithm is as shown in Fig. 2, transition state adaptive PI parameter algorithm is as shown in Figure 3；
3. electric under APU igniter when APU revolving speed reaches 55%；
4. then final output fuel flow is selected as transition state fuel flow wf-t-out after APU revolving speed reaches 80%
With the minimum value of stable state fuel flow wf-s-out, stable state fuel flow algorithm is as shown in Figure 4, in which:
Wf-t-out=FTransition state(APU_N, P2、T2、T5 *、T5),
Wf-s-out=FStable state(APU_N, P2、T2)；
When 5.APU turn up 98%, APU, which starts fuel flow control process, to be terminated, and is transferred to the control of stable state fuel oil, then most
Output fuel flow is selected as stable state fuel flow wf-s-out eventually, wherein wf-s-out=FStable state(APU_N, P2、T2)。
In conclusion the present invention presets transition state fuel flow algorithm, stable state fuel flow algorithm, final output combustion
Oily selection algorithm determines the output fuel oil stream in auxiliary power unit starting process according to final output fuel oil selection algorithm
Amount, solves the fuel flow control problem under different operating conditions in APU starting process, the fuel oil stream of adaptation is supplied in starting process
Amount, fuel delivery and the APU of control need oil mass almost the same, be not in fuel flow it is too large or too small and influence oil-gas ratio,
Starting time, heat suspension, avoid the occurrence of overtemperature, excess revolutions, even starting failure, it can be ensured that the safe handling of APU, fuel oil
Economy is able to extend the service life of APU.Meanwhile transition state fuel flow algorithm includes: transition state based on delivery temperature
Control algolithm, transition state adaptive PI parameter algorithm, transition state fuel flow limit algorithm can be under different operating conditions, it is ensured that
Overtemperature, real-time adjusting PI parameter do not export the fuel flow being adapted with APU to delivery temperature；Stable state fuel flow algorithm includes:
Stable state constant rotational speed closed loop PI control algolithm, stable state fuel flow limit algorithm, the fuel flow that output is adapted with APU, really
Protect the not excess revolutions of APU revolving speed.The present invention can ensure that in entire starting process APU not overtemperature, not excess revolutions, can adapt to bigger flight
Envelope curve, it is stronger to the environmental suitability of system.
Claims (5)
1. a kind of fuel flow control method for starting auxiliary power unit APU, it is characterised in that；Method includes:
Preset transition state fuel flow algorithm, stable state fuel flow algorithm, final output fuel flow selection algorithm；
The fuel flow in auxiliary power unit starting process is determined according to the final output fuel flow selection algorithm.
2. fuel oil control method according to claim 1, it is characterised in that:
It is described to preset transition state fuel flow algorithm, stable state fuel flow algorithm, final output fuel flow selection algorithm,
It specifically includes:
If revolving speed < 80% of the APU, the final output fuel flow selection algorithm is that transition state fuel flow is calculated
Method；
If 98% < APU revolving speed≤100%, the final output fuel flow selection algorithm is that stable state fuel flow is calculated
Method；
If 80%≤APU revolving speed≤98%, it is less than when according to the calculated value of the transition state fuel flow algorithm according to institute
When stating the calculated value of stable state fuel flow algorithm, the final output fuel flow selection algorithm is the transition state fuel oil stream
Quantity algorithm；It is more than or equal to when according to the calculated value of the transition state fuel flow algorithm according to the stable state fuel flow algorithm
When calculated value, the final output fuel flow selection algorithm is the stable state fuel flow algorithm.
3. fuel oil control method according to claim 1, it is characterised in that:
The transition state fuel flow algorithm includes: control algolithm, transition state adaptive PI ginseng of the transition state based on delivery temperature
Figure method, transition state fuel flow limit algorithm；
The stable state fuel flow algorithm includes: stable state constant rotational speed closed loop PI control algolithm, stable state fuel flow limit algorithm.
4. fuel oil control method according to claim 3, it is characterised in that:
Control algolithm of the transition state based on delivery temperature, transition state adaptive PI parameter algorithm, transition state fuel flow limit
Algorithm processed, specifically includes:
According to current APU revolving speed, current inlet pressure P2Determine the expectation delivery temperature under current APU revolving speed；
Calculate the actual exhaust air temperature T under current APU revolving speed5With the expectation delivery temperature under the current APU revolving speedWork as
Preceding temperature deviation；
According to current inlet temperature T2, the current inlet pressure P2Calculate current adaptive proportionality coefficient P and current adaptive product
Divide coefficient I；
According to the current APU revolving speed, current inlet temperature T2, the current inlet pressure P2, calculate current transition state fuel oil stream
Amount limitation upper limit wf-t-max and current transition state fuel flow limit lower limit wf-t-min；
Current transition is calculated according to the Current Temperatures deviation, current adaptive proportionality coefficient P and current Adaptive Integral coefficient I
State fuel flow wf-t；
If the wf-t >=the wf-t-max, exporting transition state fuel flow wf-t-out is wf-t-max；
If the wf-t≤the wf-t-min, exporting transition state fuel flow wf-t-out is wf-t-min；
If the wf-t-min < wf-t < wf-t-max, exporting transition state fuel flow wf-t-out is wf-t.
5. fuel oil control method according to claim 3, it is characterised in that:
The stable state constant rotational speed closed loop PI control algolithm, stable state fuel flow limit algorithm specifically include:
Current rotating speed deviation is calculated according to current APU revolving speed and expectation revolving speed, the expectation revolving speed is preset parameter；
Current steady state fuel flow wf-s, the ratio are calculated according to the current rotating speed deviation, proportionality coefficient P, integral coefficient I
FACTOR P, integral coefficient I are preset parameter；
According to the current APU revolving speed, current inlet temperature T2, current inlet pressure P2, calculate the current steady state fuel flow upper limit
Wf-s-max and current steady state fuel flow lower limit wf-s-min；
If the wf-s >=the wf-s-max, exporting transition state fuel flow wf-s-out is wf-s-max；
If the wf-s≤the wf-s-min, exporting transition state fuel flow wf-s-out is wf-s-min；
If the wf-s-min < wf-s < wf-s-max, exporting transition state fuel flow wf-s-out is wf-s.
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Cited By (1)
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