CN101256117A - Device and method for testing synthesis parameter of aviation piston engine - Google Patents
Device and method for testing synthesis parameter of aviation piston engine Download PDFInfo
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- CN101256117A CN101256117A CNA2008101027612A CN200810102761A CN101256117A CN 101256117 A CN101256117 A CN 101256117A CN A2008101027612 A CNA2008101027612 A CN A2008101027612A CN 200810102761 A CN200810102761 A CN 200810102761A CN 101256117 A CN101256117 A CN 101256117A
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Abstract
The invention discloses an aviation piston engine all-purpose parameter test device and a method thereof, the test device includes: a control unit TCU, an IMS, a flight control computer, a servo-electric motor, a turbo-charger and an engine. The turbo-charger is driven by the engine discharge gas and supplies the turbo-charged air for the engine, the servo-electric motor is controlled by the control signal outputted from the turbo control unit TCU which senses and calculates correlation parameters, which causes the connected valve deflexion, in order to change the turbo-charged air pressure which is transferred from the turbo-charger to the aviation piston engine. The all-purpose parameter test system IMS, taken the singlechip as the kernel, obtains engines running status parameter and TCU controlling parameter, judges the two parts of parameters with overrun judgment and gives status code according to the fault mode, packs this two parts of parameters and status codes; transmits the packed parameters to the flight control computer; the flight control computer then carries the followed processing and transmits the data down to the ground.
Description
Technical field
The invention belongs to the aviation technical field of measurement and test, be specifically related to a kind of testing synthesis parameter devices and methods therefor of aviation piston engine.
Background technology
Well-known, the characteristics of UAS do not have the pilot exactly.The engine of the common people's of having aircraft and the state parameter of airborne equipment all are shown on pilot's the guidance panel by instrument, and unmanned plane reaches ground under the process observing and controlling Radio Link after all measurement parameters need being changed by A/D again.Wherein, the test parameter of engine section is no exception.
Conventional unmanned vehicle engine test parameter is when carrying out the subsurface biography, at first according to the Engine Block Test needs, determine test parameter and sensor thereof, then design and produce the sensor modulate circuit, voltage signal after the conditioning again through cable transmission to the data collecting card of airborne flight control computer, A/D ALT-CH alternate channel by data collecting card is converted to digital signal with voltage analog signal, thereby carries out the preset program processing and descend biography by digital radio link.
For band turbo-charger sytem and turbosupercharger by the aviation piston engine of automatically controlled turbosupercharger control module TCU control independently, except measuring conventional engine operating state parameter, comprise: outside engine speed RPM, cylinder head temperature CHT, delivery temperature EGT, oil temperature OILT, the lubricating oil pressure OILP parameter, also need to reach ground under the controlled variable with TCU, so that judge whether turbo-charger sytem work is normal.The TCU controlled variable comprises: engine speed RPM, joint throttle opening THP, atmosphere static pressure SP, air cartridge pressure ABP, air cartridge temperature ABT, supercharger bypass valve aperture SwgP, these parameters are used for TCU control turbosupercharger.The engine speed RPM here is a same sensor two paths of signals in parallel with engine speed RPM in the engine operating state parameter.
Engine speed RPM has reflected the operation speed of engine, and the engine operation is too fast to be that engine speed RPM excess revolutions meeting causes engine to damage.The throttle valve opening that joint throttle opening THP refers to behind the carburetor or the electronic fuel injection engine atomizer is preceding, it has reflected the throttling effect of engine charge, and the joint throttle opening is big more, and air input of engine by air is big more, and power output is big more.Cylinder head temperature CHT has measured the temperature of cylinder cylinder head, and this parameter has reflected the situation of being heated of engine cylinder-body, and cylinder head temperature CHT is too high to be that overtemperature can cause engine cylinder-body to damage.Delivery temperature EGT has measured the temperature of each cylinder exhaust manifold, the working condition that has directly reflected each cylinder, each working cycle of engine, the exhaust gas temperature of its discharge is slightly different, but it is too many that each cylinder delivery temperature can not differ, if being below or above other delivery temperatures, some delivery temperatures reach more than 200 ℃, this delivery temperature corresponding cylinder operation irregularity then, still there is not improvement more than 1 minute, can judge that this cylinder combustion is bad, possible cause is that the serious or carburetor of sooting of the spark plug has obstruction.Oil temperature OILT measures the temperature behind the motor oil pump, lubricating oil not only has lubricated effect, take away the effect of lubricated parts heat in addition, oil temperature not only influences the viscosity and the greasy property of lubricating oil, also has influence on the heat radiation of lubricated parts, oil temperature is low excessively, greasy property is bad, and oil temperature is too high, and same lubricant effect is bad, and lubricated part temperatures is too high, causes parts damages easily.Lubricating oil pressure OILP measures the pressure behind the motor oil pump, and lubricating oil pressure is low excessively, can cause lubricated badly, and lubricating oil pressure is too high represents that then lubrication channel has obstruction, lubricated equally bad.Pressure when atmosphere static pressure SP measures engine installation position non-moving air has reflected air environment pressure, has also reflected the admission pressure of turbosupercharger, and this parameter participates in turbosupercharger control, is indispensable parameter.Air cartridge pressure ABP measures the steady pressure in the air cartridge that plays pressure stabilization function after the turbosupercharger, has reflected the actual admission pressure of engine, and this pressure is controlled automatically by TCU.Air cartridge temperature ABT measures the air themperature in the air cartridge that plays pressure stabilization function after the turbosupercharger, and this temperature is too high can to increase engine knock danger, and being lower than zero degree then can increase carburettor icing danger, and this parameter is also controlled automatically by TCU.Supercharger bypass valve aperture SwgP measures indirectly by the position of measuring the servomotor that links together with supercharger bypass valve, when air cartridge pressure does not reach predetermined boost pressure, supercharger bypass valve aperture SwgP will progressively reduce, make more waste gas be used to drive the turbine acting and drive the pneumatic plant pressurized air, otherwise, air cartridge pressure is higher than predetermined pressure, then supercharger bypass valve aperture SwgP progressively increases, reduce the exhausted air quantity that is used to do work, thereby reach the purpose of control air cartridge pressure.
Method of testing to engine parameter on the unmanned plane is at present: with the engine operating state parameter, comprise: engine speed RPM, cylinder head temperature CHT, oil temperature OILT, lubricating oil pressure OILP, delivery temperature EGT sensor signal are carried out signal condition by cable transmission to electric main control box, and with conditioned 0～5VDC signal by cable transmission to flight control computer, carry out the A/D conversion by flight control computer, measure and gather above-mentioned parameter.And air cartridge pressure ABP, atmosphere static pressure SP, these three parameters of air cartridge temperature ABT need participate in the control of TCU, can not the parallel sensor signal, so, additionally increase sensor in air cartridge pressure ABP, the atmosphere static pressure SP of TCU use, the measuring position that air cartridge temperature ABT sensor is identical, after electric main control box conditioning, measure collection equally again by flight control computer.Joint damper positions THP signal then provides value of feedback by joint air door steering engine controller.
In above-mentioned parameter test processes process, each engine measuring parameter all needs to take the A/D acquisition channel, will consume mass data acquisition channel resource and strengthen the system resources consumption of flight control computer.Sensor transfers to modulate circuit from the Engine Block Test point, through modulate circuit various sensor signals is converted to the normal voltage signal, by cable voltage signal is transferred to the capture card of flight control computer again.In the transmission course of simulating signal, because UAS electric circumstance complexity, this unavoidably can cause the measuring error of simulating signal to a certain extent owing to various interference.
Summary of the invention
The objective of the invention is in order to solve the existing problem that the engine parameter method of testing is existed, adopted the IMS of testing synthesis parameter system to finish to engine state parameters, the collection of TCU parameter, conversion, interim storage, and these parameters are transfinited check and fault mode is judged, last integrated data frame, again the Frame that contains engine integration test parameter after integrated is transferred to flight control computer with digital signal form, reduce engine measuring parameter taking thereby reach to the flight control computer data acquisition channel, reduce flight control computer at the digital-to-analog conversion computing of engine measuring parameter and the resource consumption in the processing procedure, reduce the measuring error that causes because of interference in the analog signal transmission process, improve Percent Isolated, the purpose of fault detect rate.
Among the present invention, a kind of aviation piston engine testing synthesis parameter devices and methods therefor that is used for unmanned plane is provided, described aviation piston engine testing synthesis parameter device comprises control module TCU, IMS, flight control computer, servomotor, turbosupercharger and engine, connects by cable or circuit board line between each parts.
Control module TCU possesses and the corresponding serial line interface of communication interface, can be by set communications protocol and external unit IMS communication, in order to transmit current TCU parameter signal and the work of control servomotor.The turbine inlet place of turbosupercharger is equipped with a by-pass valve, and this by-pass valve is connected by steel wire with servomotor, drives by-pass valve by servomotor and carries out the deflection of optional position, and supercharger bypass valve aperture SwgP just characterizes the degree of this by-pass valve deflection.The turbine inlet of turbosupercharger links to each other with engine exhaust, relies on engine exhaust to drive turbine, and turbine drives the pneumatic plant acting of coaxial connection with it, will be delivered to engine intake after the atmosphere supercharging again.IMS mainly comprises modulate circuit, single-chip microcomputer, analog switch and level conversion unit, TCU PORT COM, flight control computer PORT COM, IMS is used to nurse one's health the parameter of gathering engine operating state parameter sensors signal and obtaining TCU, carrying out parameter transfinites and judges and fault mode judges that laggard line data is integrated, and integrated comprehensive parameters Frame is sent to flight control computer.
Described aviation piston engine testing synthesis parameter method may further comprise the steps:
Step 5, IMS are to the TCU request msg.Single Chip Microcomputer (SCM) program control analog switch and level conversion unit point to the TCU PORT COM, send TCU parameter request command frame, after TCU receives the parameter request command frame, send all supplemental characteristics of current TCU to the IMS of testing synthesis parameter system; After the IMS of testing synthesis parameter system receives the TCU parameter, carry out corresponding interim storage.
The parameter of carrying out step 6, IMS transfinites and judges and fault judgement.Parameter transfinites and judges based on the parameter limit table, and fault mode judges based on bug list, and being input as parameter transfinites and judge the code of output, exports the fault mode code.
The invention has the advantages that:
(1) test, collection and the data of finishing engine operating parameter by the IMS of testing synthesis parameter system are judged, save flight control computer A/D ALT-CH alternate channel resource, reduce the flight control computer resource consumption;
(2) in the IMS of testing synthesis parameter system, integrate fault diagnosis, improved the test intelligent level, improved engine diagnosis rate and Percent Isolated;
(3) by the transmission of short-range sensors signal and digital signal and flight control computer communication, reduce signal attenuation and the interference of sensor die analog signal on transmission line, improved measuring accuracy;
(4) the sensor modulate circuit is finished by the IMS of testing synthesis parameter system, has reduced the complexity of aircraft main control conditioning box.
Description of drawings
Fig. 1 is an aviation piston engine testing synthesis parameter device annexation synoptic diagram of the present invention;
Fig. 2 is the testing synthesis parameter IMS of a system hardware elementary diagram of the present invention;
Fig. 3 is a testing synthesis parameter method flow diagram of the present invention.
Among the figure:
The 1-single-chip microcomputer, 2-TCU, the 3-testing synthesis parameter IMS of system, the 4-flight control computer, 5-servomotor, 501-by-pass valve, the 502-steel wire, 6-turbosupercharger, 601-pneumatic plant, the 602-turbine, the 7-piston engine, 8-nurses one's health unit, 9-analog switch and level conversion unit, the 10-TCU PORT COM, 11-flight control computer PORT COM;
The RPM-engine speed, THP-saves damper positions, SP-atmosphere static pressure, ABP-air cartridge pressure, ABT-air cartridge temperature, SwgP-supercharger bypass valve aperture, CHT-cylinder head temperature, EGT-delivery temperature, OILT-oil temperature, OILP-lubricating oil pressure.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
With reference to Fig. 1, engine testing synthesis parameter device of the present invention mainly is made up of control module TCU2, the IMS3 of testing synthesis parameter system, flight control computer 4, servomotor 5, turbosupercharger 6 and engine 7, connects by cable or circuit board line between each parts.TCU2 possesses and communication interface 10 corresponding serial line interfaces, can be by set communications protocol and external unit IMS3 communication, and in order to transmit current TCU2 parameter signal, TCU2 controls signal to servomotor 5 by cable transmission.Servomotor 5 connects a by-pass valve 501 by steel wire 502, by-pass valve 501 is installed in turbine 602 inflow points of turbosupercharger 6, servomotor 5 drives by-pass valve 501 by steel wire 502 and carries out deflection, and supercharger bypass valve aperture SwgP just characterizes the degree of these by-pass valve 501 deflections.Turbine 602 imports of turbosupercharger 6 link to each other with engine 7 exhausts, rely on engine 7 exhaust gas-driven turbine 602, and turbine 602 drives pneumatic plant 601 actings of coaxial connection with it, will be delivered to engine 7 air intake openings after the atmosphere supercharging again.
Described control module TCU2 is by the corresponding engine speed RPM of connected sensor acquisition, joint damper positions THP, atmosphere static pressure SP, air cartridge pressure ABP, air cartridge temperature ABT, supercharger bypass valve aperture SwgP parameter signal, and parameter signal is converted to physical quantity, calculate servomotor 5 needed control signals according to the TCU2 control strategy on this basis, control signal by cable transmission to servomotor 5, drive servomotor 5 actions, thereby control the running of turbosupercharger 6 automatically, so control module TCU2 also is called the turbosupercharger control module.Described sensor comprises engine speed RPM sensor, joint throttle opening THP sensor, atmosphere static pressure SP sensor, air cartridge pressure ABP sensor, air cartridge temperature ABT sensor, supercharger bypass valve aperture SwgP sensor.
Described flight control computer 4 is the core components on the unmanned plane, the signal measurement, calculation of parameter of finishing each subsystem handled, complicated control, with function such as wireless data link communication;
The described testing synthesis parameter IMS3 of system is with reference to Fig. 2, and the IMS3 of testing synthesis parameter system is a core with single-chip microcomputer 1, and this single-chip microcomputer 1 possesses the A/D translation function, and possesses the digital communication function.IMS3 is used to gather conditioning engine 7 running state parameter sensor signals and obtains the parameter of TCU2, and carrying out parameter transfinites and judge and fault mode judges that laggard line data is integrated, and integrated comprehensive parameters Frame is sent to flight control computer 4.IMS3 mainly comprises modulate circuit 8, single-chip microcomputer 1, analog switch and level conversion unit 9, TCU PORT COM 10 and flight control computer 4 PORT COM 11.
Described modulate circuit 8 is used for signals such as different signal form that engine operating state parameter sensors transmission is come such as frequency, resistance, micro voltage and nurses one's health into the normal voltage signal of 0～5VDC by methods such as amplification, conversion, filtering, carries out the A/D conversion for single-chip microcomputer 1 to gather; The input of modulate circuit 8 is connected with the sensor wire of engine, and output is connected with single-chip microcomputer 1.
Described single-chip microcomputer 1 is used for the signal of acquisition and conditioning circuit 8 outputs, and the signal that collects is carried out the conversion Calculation and the processing of electric weight and physical quantity, then with TCU2 and flight control computer 4 communications.The A/D converter of single-chip microcomputer 1 is gathered the sensor signal of input end access after modulate circuit 8 conditionings, the PORT COM pin connects the input end of analog switch and level conversion unit 9, and the output terminal of analog switch and level conversion unit 9 connects TCU2 PORT COM 10 and flight control computer 4 PORT COM 11.
Described analog switch and level conversion unit 9 comprise analog switch and level conversion device.Analog switch is the bidirectional analog switch of Digital Signals, under different control signal effects, the data of public input end are connected with different output channels respectively, reached the digital communication port of single-chip microcomputer 1 is connected the also purpose of communication with different external communication ports respectively; Analog switch among the present invention is connected TCU2 PORT COM 10 and flight control computer 4 PORT COM 11 by single-chip microcomputer 1 control respectively by both definite sequences; The level conversion device is that the device chip is received/sent out in a kind of digital communication, the effect of playing is to carry out different digital level conversions in digital communication, what single-chip microcomputer 1 adopted when carrying out digital communication is the TTL/CMOS level, and the external communication interface level is other level standards such as RS232 or RS422, when level conversion device during as transmitter, the TTL/CMOS level of input single-chip microcomputer 1 is exported outside level standard; During as receiver, import outside level standard, output TTL/CMOS level; TCU2 PORT COM 10 and flight control computer 4 PORT COM 11 are the external connection port form, and common port connected in series is a standard nine kinds of needles interface; The IMS3 of testing synthesis parameter system just adopts the corresponding ports type of attachment to be connected with stube cable between TCU2, the flight control computer 4.In the present invention, level conversion device unit is used for single-chip microcomputer 1 digital level is converted to and TCU2 PORT COM 10, flight control computer 4 PORT COM 11 corresponding digital levels.
When utilizing above-mentioned parameter test device to carry out the engine operating parameter test, it at first is the power-on self-test that carries out IMS3 and TCU2, self check is opened engine 7 by the back, exhaust-gas-driven turbo charger 6 work of engine 7, output control signal control servomotor 5 after turbosupercharger 6 is gathered correlation parameter and carried out computing by control module TCU2, make by-pass valve 501 deflections that are attached thereto, change the air capacity that is used to drive turbosupercharger 6, thereby change the charge-air pressure that turbosupercharger 6 is transported to aviation piston engine 7.IMS3 gathers engine 7 various operating parameter signals, and the signal that is obtained is carried out electric weight and physical quantity conversion, stores, the TCU2 data of obtaining then and pack, and export flight control computer 4 to.Concrete method of testing flow process as shown in Figure 3.
With reference to Fig. 3, the concrete workflow of aviation piston engine testing synthesis parameter method provided by the invention is as follows:
Before engine 7 starts, power up for engine 7 control circuits, give the IMS3 of testing synthesis parameter system power supply, TCU2 power supply, IMS3 and TCU2 begin to carry out power-on self-test, as sensor occurs or miscellaneous part is unusual, provide alerting signal.After fault is got rid of, power-on self-test by and carry out engine 7 and start and drive.
After self check is passed through, TCU2 works automatically, IMS3 moves automatically, and single-chip microcomputer 1 programmed control analog switch among the IMS3 of testing synthesis parameter system and level conversion unit 9 point to flight control computer 4 PORT COM 11, is in and waits for flight control computer 4 forward data request command frame states.
When engine 7 started, each sensor was experienced engine 7 each running state parameter; Engine speed RPM output frequency signal, and along with engine 7 operating conditions change and change; Cylinder head temperature CHT, oil temperature OILT output PT100 resistance signal, resistance value changes along with the temperature variation of being experienced; Delivery temperature EGT is according to the exhaust gas temperature experienced and the heat outputting electric potential signal; Lubricating oil pressure OILP raises along with the operate as normal of oil pump and is stabilized in the certain numerical value scope output resistance signal;
If the IMS3 of testing synthesis parameter system receives the data request command frame of flight control computer 4 in above-mentioned cyclic process, then the 1 response interrupt request of the single-chip microcomputer in the IMS3 is interrupted the current procedure code, transfers the execution interrupt handling routine to;
Step 5, IMS3 are to the TCU2 request msg.Single-chip microcomputer 1 programmed control analog switch and level conversion unit 9 point to TCU2 PORT COM 10, send TCU2 parameter request command frame, after TCU2 receives the parameter request command frame, send all supplemental characteristics of current TCU2 to the IMS3 of testing synthesis parameter system; After the IMS3 of testing synthesis parameter system receives the TCU2 parameter, the engine operating parameter back that temporarily is stored in the step 3 to be stored.
The parameter of carrying out step 6, IMS3 transfinites and judges and fault judgement.Program in the single-chip microcomputer 1 is carried out each supplemental characteristic according to the engine parameter limits value of setting and is judged, and provide the relevant parameter code that transfinites, then, transfinite code according to the fault mode table of setting, search failure cause, abort situation, with reference to the solution code according to parameter.Parameter transfinites and judges based on the parameter limit table, this table stores the limits value of each parameter, comprise the data upper limit, data lower limit, parameter is numbered in order, the parameter code that transfinites then stipulates to surpass upper limit output 1, is lower than lower limit output 0, and then parameter numbering and the code combination that transfinites are the parameter judgement output code that transfinites, as not transfiniting, no-output then.Fault mode judges based on bug list, and being input as parameter transfinites and judge the code of output, output fault mode code.The fault mode code is provided with according to actual operating position of engine and known failure condition, and carries out perfect in actual use.
Need to prove that TCU2 is to finish automatically in real time to the control of turbosupercharger 6 in whole process.Only response is interrupted after receiving the command frame that the IMS3 of testing synthesis parameter system sends, and sends the current TCU2 parameter of a frame, returns interruption then, continues control turbosupercharger 6 automatically.
The IMS3 of testing synthesis parameter system is still carrying out the engine state parameters collecting work when waiting for the command frame state of flight control computer 4, and refreshes corresponding supplemental characteristic in the scratchpad area (SPA) with up-to-date collection value.When receiving the command frame of flight control computer 4, adopt interrupt mode to carry out.This method advantage is that the Frame response is fast, directly extracts the good supplemental characteristic of data acquisition.
Under the situation of considering energy resource consumption, also can adopt another scheme, promptly when waiting for the command frame state of flight control computer 4, single-chip microcomputer 1 is in holding state, when responding the command frame interrupt routine of flight control computer 4, carry out the engine operating parameter data acquisition again, other steps are identical.This scheme data response is slower than last kind of scheme, gathers because need to carry out the A/D conversion in interrupt routine, and advantage is that the single-chip microcomputer energy resource consumption is lower.
The engine operating state parameter sensors is connected on the connection terminal of the modulate circuit 8 among the IMS3 of testing synthesis parameter system by cable.Need to prove that the sensor in engine speed RPM sensor and the TCU2 parameter is same sensor, the frequency signal of this sensor output is transported to respectively among TCU2 and the IMS3 of testing synthesis parameter system simultaneously.
Claims (5)
1, the testing synthesis parameter device of aviation piston engine comprises control module TCU, flight control computer, servomotor, turbosupercharger and engine, it is characterized in that: described proving installation also comprises an IMS of testing synthesis parameter system; Control module TCU possesses external communication interface, can be by set communications protocol and external unit communication, in order to transmit current TCU parameter signal and the work of control servomotor; The turbine inlet place of turbosupercharger is equipped with a by-pass valve, and this by-pass valve is connected by steel wire with servomotor, drives by-pass valve by servomotor and carries out opening and closing; The turbine inlet of turbosupercharger links to each other with engine exhaust, relies on engine exhaust to drive turbine, and turbine drives the pneumatic plant acting of coaxial connection with it, will be delivered to engine intake after the atmosphere supercharging again; IMS is used to gather conditioning engine operating state parameter sensors signal and obtains the parameter of TCU, and carrying out parameter transfinites and judge and fault mode judges that laggard line data is integrated, and integrated comprehensive parameters Frame is sent to flight control computer;
All connect between the above-mentioned parts or the circuit board line connection by cable.
2, the testing synthesis parameter device of aviation piston engine according to claim 1 is characterized in that: the described testing synthesis parameter IMS of system mainly comprises modulate circuit, single-chip microcomputer, analog switch and level conversion unit, TCU PORT COM and flight control computer PORT COM.
3, the testing synthesis parameter device of aviation piston engine according to claim 2, it is characterized in that: described modulate circuit is used for different signal form that engine operating state parameter sensors transmission is come and nurses one's health into the normal voltage signal of 0～5VDC by methods such as amplification, conversion, filtering, carries out the A/D conversion for single-chip microcomputer and gathers; The input of modulate circuit is connected with the sensor wire of engine, and output is connected with single-chip microcomputer; Described single-chip microcomputer is used for the signal of acquisition and conditioning circuit output, and the parameter that collects is calculated and handled, then with TCU and flight control computer communication; The A/D converter of single-chip microcomputer is gathered the sensor signal of input end access after the modulate circuit conditioning, the PORT COM pin connects analog switch and level conversion unit, described analog switch and level conversion unit comprise analog switch and level conversion device, connect TCU PORT COM and flight control computer PORT COM by digital cable; Wherein analog switch is connected TCU PORT COM and flight control computer PORT COM by Single-chip Controlling respectively by both definite sequences; Level conversion device unit is used for the single-chip microcomputer digital level is converted to and TCU PORT COM, the corresponding digital level of flight control computer PORT COM.
4, aviation piston engine testing synthesis parameter method is characterized in that comprising the steps:
Step 1, IMS and TCU power-on self-test; As sensor appears or miscellaneous part is unusual, provide alerting signal; After fault is got rid of, power-on self-test by and carry out engine start and drive;
Step 2, TCU work automatically, and IMS moves automatically, and wait for the flight control computer order; Single Chip Microcomputer (SCM) program control analog switch and level conversion unit among the IMS of testing synthesis parameter system point to the flight control computer PORT COM, are in to wait for flight control computer forward data request command frame state;
Step 3, IMS carry out data acquisition, storage; Each sensor is experienced each running state parameter of engine and is connected to by sensor cable and exports single-chip microcomputer to after modulate circuit among the IMS of testing synthesis parameter system is nursed one's health in engine start, single-chip microcomputer carries out the A/D conversion, gathers parameter signal, and carries out corresponding interim storage; Constantly carry out operational factor impression, conversion in the engine operation process, gather and interim cycling of storing;
Step 4, IMS receive the flight control computer data request command; If the IMS of testing synthesis parameter system receives the data request command frame of flight control computer, then the response of the single-chip microcomputer in IMS interrupt request is interrupted the current procedure code, transfers the execution interrupt handling routine to;
Step 5, IMS are to the TCU request msg; Single Chip Microcomputer (SCM) program control analog switch and level conversion unit point to the TCU PORT COM, send TCU parameter request command frame, after TCU receives the parameter request command frame, send all supplemental characteristics of current TCU to the IMS of testing synthesis parameter system; After the IMS of testing synthesis parameter system receives the TCU parameter, carry out corresponding interim storage;
The parameter of carrying out step 6, IMS transfinites and judges and fault judgement; Parameter transfinites and judges based on the parameter limit table, and fault mode judges based on bug list, and being input as parameter transfinites and judge the code of output, exports the fault mode code;
Step 7, IMS packing data frame; After IMS carried out fault judgement, integrated engine running state parameter, TCU parameter and various code were a formatted data frame;
Step 8, transmission Frame are to flight control computer.
5, aviation piston engine testing synthesis parameter method according to claim 4, it is characterized in that: described in the step 2 when waiting for the command frame state of flight control computer, also can be that single-chip microcomputer is in holding state, when responding the command frame interrupt routine of flight control computer, carry out the engine operating parameter data acquisition again, other steps are identical.
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