CN114687865B - State machine following method of FADEC control software - Google Patents
State machine following method of FADEC control software Download PDFInfo
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- CN114687865B CN114687865B CN202210180681.9A CN202210180681A CN114687865B CN 114687865 B CN114687865 B CN 114687865B CN 202210180681 A CN202210180681 A CN 202210180681A CN 114687865 B CN114687865 B CN 114687865B
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000012545 processing Methods 0.000 claims abstract description 18
- 238000013508 migration Methods 0.000 claims abstract description 9
- 230000005012 migration Effects 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 4
- 230000006870 function Effects 0.000 claims description 16
- 230000007704 transition Effects 0.000 claims description 7
- 238000004590 computer program Methods 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 abstract description 3
- 238000004891 communication Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
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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
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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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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Hardware Redundancy (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The invention discloses a state machine following method of FADEC control software, which comprises the following steps: registering engine state machine information; setting an initial running state of a state machine and starting running; running the state machine, inquiring a state migration event table, and updating the running state of the current state machine according to the inquiring result; the backup channel uses the state information of the main control channel to reset the running state of the current state machine; executing state scheduling, comparing with the previous period running state, if the state is changed, executing the exiting processing of the previous period running state, executing the entering processing of the current state, and finally executing the running processing of the current state; if the state is unchanged, only the running process of the current state is executed. The invention can ensure that the control states of the two-channel engine can be always consistent, and when the main channel and the standby channel are switched, the original standby channel can correctly and quickly take over the main control right, thereby ensuring that the engine operation is controlled continuously and reliably; the invention has high software operation efficiency and does not destroy the operation scheduling mechanism of the state machine.
Description
Technical Field
The invention relates to a software development technology, in particular to a state machine following method of FADEC control software.
Background
Aeroengine state control is an important function of FADEC system control. Finite state machines are commonly employed in FADEC systems to control engine start, stop, and operation and switching under various operating conditions. In order to ensure safe and reliable control, the FADEC system generally adopts a mode of inquiring a state transition event table to realize the scheduling of the engine state.
The dual-channel main-standby control is a common design framework of a FADEC system, a main control channel outputs control signals, when the main control channel is reset, manually switched or the active control right is abandoned under the condition specified by the requirement, the original standby channel is converted into the main control channel, and when the main and standby channels are switched, the continuous function and the stable control of the engine can be ensured. However, the signal sampling of the two channels may be different, or a certain channel may fail, and the engine control states of the two channels are inconsistent, so that the control output signal may have a great disturbance after the channels are switched between the main channel and the standby channel, and the stable operation of the engine may not be ensured.
Disclosure of Invention
The invention aims to: the invention aims to provide a state machine following method of FADEC control software, so that the state machine operation of a backup channel can follow the state of an upper main control channel, and the state of an engine is ensured to be continuous and stable when the main and backup channels are switched.
The technical scheme is as follows: the state machine following method of the FADEC control software comprises the following steps: the main control channel can perform event inquiry, state migration and state operation control according to a normal scheduling mechanism of the finite state machine; the backup channel obtains the state information of the main control channel through communication among channels, and inserts the state information of the main control channel into the operation of the finite state machine under the condition of not changing the normal scheduling mode of the finite state machine, so that the state of the backup channel is consistent with that of the main control channel, and the method comprises the following specific steps:
(1) Registering engine state machine information, including state definition, state scheduling function and state transition event table, wherein the main control channel and the backup channel state machines must be identical;
(2) Setting an initial running state of a state machine and starting running;
(3) The running state machine queries a state migration event table and updates the running state of the current state machine according to the query result;
(4) The backup channel uses the state information of the main control channel to reset the running state of the current state machine; the main control channel does not need to execute the step;
(5) Executing state scheduling, comparing with the previous period running state, if the state is changed, executing the exiting processing of the previous period running state, executing the entering processing of the current state, and finally executing the running processing of the current state; if the state is unchanged, only the running process of the current state is executed.
A computer storage medium having stored thereon a computer program which when executed by a processor performs a state machine following method of FADEC control software of the above steps.
A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing a state machine following method of FADEC control software for the above steps when executing the computer program.
The beneficial effects are that: compared with the prior art, the invention has the following advantages:
1. the control state of the dual-channel engine can be always consistent, and when the main channel and the standby channel are switched, the original standby channel can correctly and quickly take over the master control right, so that the operation of the engine is continuously and reliably controlled;
2. the method is simple and effective, is relatively independent of the control function of the engine, has high software operation efficiency, and does not destroy the operation scheduling mechanism of the state machine.
Drawings
FIG. 1 is a schematic diagram of the operation of a host-backup channel software state machine according to the present invention.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings.
The finite state machine operates as a packaged general purpose processing module that performs state migration and control processing by calling three interface functions:
registering an engine State table function fdc_status lib_state_register (state_ptable, state_info_pstate);
the State machine initializes an interface function fdc_status lib_state_setinit (fdc_int32 SstateID, state_info pState);
the State machine schedule interface function fdc_status lib_state_run (state_info pState, fdc_int32s plCurChanStateID, FDC _bool bStateSetFlg, FDC _int32 SSetStateID);
step 1, registering engine State machine information through a lib_state_register interface function, wherein the engine State machine information comprises three parts: the state definition, the state scheduling function and the state transition event table are designed as follows:
1) The state definition ID is an index of the state machine, each state definition unique ID number;
2) The STATE scheduling function stateRun comprises STATE entry processing, STATE running processing and STATE EXIT processing, and is driven to execute according to scheduling commands (state_ENTER, state_RUN and state_EXIT) of a STATE machine;
3) The state transition event table pEvTable defines the path and condition of transition between states, and the state transition path in the event table is designed according to the priority level;
step 2, setting an initial running State of the State machine through a State machine initialization interface function Lib_State_SetInit, executing an entry processing function in a State scheduling function stateRun, and starting the State machine to start running.
Step 3, based on the previous period running state, inquiring a state migration event table, judging whether a state event occurs, if so, updating the running state of the current state machine according to a migration path; if no event occurs, the current state machine running state is kept to be the state of the previous period running; if a plurality of events occur simultaneously, the state is shifted to a state with a high priority.
Step 4, acquiring state information of another channel through communication, deciding whether to execute a state following strategy, and transmitting the two information to the state machine operation through a SetStateID and a bStateSetFlg; if the state following strategy bStateSetFlg is true, inquiring a state table, and updating the information of the running state of the current state machine into the state information of the SetStateID; if bStateSetFlg is false, then step 5 is performed directly.
The following of the execution state needs three conditions:
a) The channel is a backup channel: the main control channel does not need to execute a state following strategy;
b) The last cycle is not in maintenance: some functions such as adjustable parameters, historical data maintenance or maintainability detection are executed in a maintenance state, the data is in an uncertain state, and the data is not allowed to exit to any other state at the moment, so that the maintenance state is not allowed to execute a state following strategy;
c) The communication between channels is normal: when the communication between channels fails, the real-time status of the other channel cannot be obtained,
the state following policy cannot be executed.
Step 5, executing state scheduling, comparing with the previous period running state, if the state is changed, executing the exiting processing of the previous period running state, executing the entering processing of the current state, and finally executing the running processing of the current state; if the state is unchanged, only the running process of the current state is executed.
Claims (3)
1. A state machine following method of FADEC control software, comprising the steps of:
(1) Registering engine state machine information, including state definition, state scheduling function and state transition event table, wherein the main control channel and the backup channel state machines must be identical;
(2) Setting an initial running state of a state machine and starting running;
(3) The running state machine queries a state migration event table and updates the running state of the current state machine according to the query result;
based on the previous period running state, inquiring a state migration event table, judging whether a state event occurs, and if so, updating the running state of the current state machine according to a migration path; if no event occurs, the current state machine running state is kept to be the state of the previous period running; if a plurality of events occur simultaneously, the method is shifted to a state with high priority;
(4) The backup channel uses the state information of the main control channel to reset the running state of the current state machine; the main control channel does not need to execute the step;
(5) Executing state scheduling, comparing with the previous period running state, if the state is changed, executing the exiting processing of the previous period running state, executing the entering processing of the current state, and finally executing the running processing of the current state; if the state is unchanged, only the running process of the current state is executed.
2. A computer storage medium having a computer program stored thereon, which when executed by a processor implements a state machine following method of FADEC control software according to claim 1.
3. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements a state machine following method for FADEC control software according to claim 1 when executing the computer program.
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