CN109774967B - On-line detection method for simulating engine lubricating oil temperature and avionics system crosslinking - Google Patents
On-line detection method for simulating engine lubricating oil temperature and avionics system crosslinking Download PDFInfo
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- CN109774967B CN109774967B CN201711119071.3A CN201711119071A CN109774967B CN 109774967 B CN109774967 B CN 109774967B CN 201711119071 A CN201711119071 A CN 201711119071A CN 109774967 B CN109774967 B CN 109774967B
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Abstract
The invention relates to an online detection method for simulating the cross-linking of an engine lubricating oil temperature and an avionics system, which comprises the following steps of (1) compiling online detection software: converting the temperature signal into a resistance signal through a resistance signal output board card by using online detection software, calibrating the resistance value of the test cable, and considering the calibrated resistance value in the actual output resistance signal of the software; (2) and (3) carrying out a test: after the debugging of the detection device is completed, the detection device is connected with a tested system of the airplane through the test cable, test parameters are set on a test interface of the detection device, a test instruction is sent out, the detection device automatically outputs a detection temperature value, the detection temperature value is finally displayed in an engine display and indication system of the airplane, and meanwhile, data monitoring can be carried out through a first-line detection device of the flight parameter collector. The detection method of the invention makes up the defects of the traditional detection method and improves the detection precision and efficiency.
Description
Technical Field
The invention belongs to the field of automatic detection. Relates to an automatic detection method for simulating the cross-linking of the lubricating oil temperature of an aircraft engine and an avionic system, which is developed based on a PCI bus platform. The signal of an engine lubricating oil temperature sensor on the airplane is output in a simulation mode to be crosslinked with an avionic system, and whether the crosslinking information is correct or not is displayed on a display of the airplane.
Background
After an engine lubricating oil temperature sensor on the airplane is connected with the airplane, the ambient temperature cannot be changed in real time due to the influence of the ambient environment, so that the airplane avionic system cannot make advance judgment on whether the temperature change of the actual sensor is normal or not.
At present, a resistance box is adopted to simulate the temperature of lubricating oil, and a resistance value is output by rotating a variable resistance box. Therefore, the automatic detection technology based on the PCI bus platform is provided, the method is high in test precision, the lubricating oil temperature of an engine is simulated through software programming, and whether the cross-linking of the avionic system is normal or not under different lubricating oil temperatures of the plane is simulated automatically.
Disclosure of Invention
Object of the Invention
The invention aims to provide a novel detection method aiming at the defects of large detection error, low precision, low detection efficiency, difficulty in forming automatic detection and the like of the conventional detection method for simulating the engine lubricating oil temperature by using a resistor box so as to improve the precision and efficiency of simulating the engine lubricating oil temperature and the cross-linking of an avionic system.
Technical scheme
The method for simulating the cross-linking on-line detection of the engine lubricating oil temperature and the avionic system adopts a detection device comprising a reinforced portable industrial personal computer, combines a display and a host into a whole, is provided with a program-controlled resistance module and is additionally provided with a test cable, and comprises the following steps:
(1) compiling of online detection software: converting the temperature signal into a resistance signal through a resistance signal output board card by using online detection software, calibrating the resistance value of the test cable, and considering the calibrated resistance value in the actual output resistance signal of the software;
(2) and (3) carrying out a test: after the debugging of the detection device is completed, the detection device is connected with a tested system of the airplane through the test cable, test parameters are set on a test interface of the detection device, a test instruction is sent out, the detection device automatically outputs a detection temperature value, the detection temperature value is finally displayed in an engine display and indication system of the airplane, and meanwhile, data monitoring can be carried out through a first-line detection device of the flight parameter collector.
The online detection software adopts LabWindows/CVI virtual instrument technology as a support platform; the detection device is provided with a 50-297-.
The flow of the online detection software is as follows:
step 1: firstly, initializing a program control resistance module by using a pipx40_ init () function, and setting a board card handle;
step 2: obtaining ID information of the program control resistance module by using the pipx40_ getCardID ();
and step 3: setting each channel switch state using the pipx40_ setchanneltate () function;
and 4, step 4: because the temperature and the resistance are in a piecewise linear relation, the resistance values of different temperature sections are obtained through a linear function of kx + b calculated by Y;
and 5: calibrating a resistance value Y standard of the connecting cable due to the resistance error of the connecting cable, substituting the resistance value Y standard into the Y measurement-Y calculation-Y standard, and outputting a resistance signal through a pipx40_ resSetResistance () function;
step 6: judging whether the output resistance signals are consistent through an EICAS display and a flight parameter collector line detection device of the aircraft avionics system, if so, searching error reasons, stopping detection and eliminating aircraft faults; if the detection result is the same, the detection personnel determines whether to quit, if so, the step 7 is carried out, otherwise, the step 5 is skipped to continue the detection;
and 7: the programmable resistance module is turned off by the pipx40_ close () function.
The online detection software adopts LabWindows/CVI virtual instrument technology as a support platform.
The detection device is provided with a 50-297-.
The flow of the online detection software is as follows:
step 1: firstly, initializing a program control resistance module by using a pipx40_ init () function, and setting a board card handle;
step 2: obtaining ID information of the program control resistance module by using the pipx40_ getCardID ();
and step 3: setting each channel switch state using the pipx40_ setchanneltate () function;
and 4, step 4: because the temperature and the resistance are in a piecewise linear relation, the resistance values of different temperature sections are obtained through a linear function of kx + b as a result of Y calculation, wherein k is a linear parameter, and b is a constant;
and 5: calibrating a resistance value Y standard of the connecting cable due to the resistance error of the connecting cable, substituting the resistance value Y standard into the Y measurement-Y calculation-Y standard, and outputting a resistance signal through a pipx40_ resSetResistance () function;
step 6: judging whether the output resistance signals are consistent through an EICAS display and a flight parameter collector line detection device of the aircraft avionics system, if so, searching error reasons, stopping detection and eliminating aircraft faults; if the detection result is the same, the detection personnel determines whether to quit, if so, the step 7 is carried out, otherwise, the step 5 is skipped to continue the detection;
and 7: the programmable resistance module is turned off by the pipx40_ close () function.
Advantageous effects
The detection method of the invention makes up the defects of the traditional detection method and improves the detection precision and efficiency.
Drawings
FIG. 1 is a software flow diagram;
FIG. 2 is a diagram of resistance signal switching of a programmable resistance module
Detailed Description
As shown in fig. 1 and 2, the method of the present invention comprises the following steps:
the output of the engine oil temperature signal is in a resistance mode to simulate the current oil working temperature. Since the correspondence between the temperature and the resistance is described by a piecewise linear function of y ═ kx + b, the corresponding resistance is obtained by calculating the function values of different temperature sections.
And secondly, by controlling the connection and disconnection of different relays on the 50-297-130 high-density program control resistor module, the resistors of the corresponding channels are subjected to series-parallel conversion to obtain the required resistance value. The switching of the resistance signal is shown in fig. 2.
And thirdly, calibrating the resistance values of different connecting cables by using a universal meter.
And fourthly, subtracting the resistance value of the cable from the required test value to obtain an actual test value.
And fifthly, using LabWindows/CVI virtual instrument technology to program software by using the function of the high-density program control resistance module.
And sixthly, after programming, connecting the test cable, calibrating by using a universal meter at the tail end of the cable to determine whether the resistance value is consistent with the set resistance value, and if the resistance value is inconsistent, performing software correction, and if the resistance value is consistent, performing butt joint with an aircraft avionics system.
Seventhly, connecting the electric connector of the aircraft avionic system through a connecting cable, starting a cross-linking test, setting different temperature values, clicking an output instruction, simultaneously displaying temperature signals on an EICAS display and a first-line detection device of a flight parameter collector of the aircraft, and if the temperature signals are consistent, judging that the test is qualified; if the display is consistent with the flight parameter equipment and the EICAS display of the airplane is not consistent, the fault reason of the display on the airplane needs to be searched.
Claims (3)
1. The method for simulating the cross-linking on-line detection of the engine lubricating oil temperature and the avionic system adopts a detection device comprising a reinforced portable industrial personal computer, integrates a display and a host into a whole, is provided with a program-controlled resistance module and is additionally provided with a test cable, and is characterized by comprising the following steps of:
(1) compiling of online detection software: converting the temperature signal into a resistance signal through a resistance signal output board card by using online detection software, calibrating the resistance value of the test cable, and considering the calibrated resistance value in the actual output resistance signal of the software;
(2) and (3) carrying out a test: after debugging of the detection device is completed, the detection device is connected with a tested system of the airplane through a test cable, test parameters are set on a test interface of the detection device, a test instruction is sent out, the detection device automatically outputs a detection temperature value, the detection temperature value is finally displayed in an engine display and indication system of the airplane, and meanwhile, data monitoring can be carried out through a first-line detection device of a flight parameter collector;
the flow of the online detection software is as follows:
step 1: firstly, initializing a program control resistance module by using a pipx40_ init () function, and setting a board card handle;
step 2: obtaining ID information of the program control resistance module by using the pipx40_ getCardID ();
and step 3: setting each channel switch state using the pipx40_ setchanneltate () function;
and 4, step 4: since temperature is piecewise linear with resistance, by YCalculating outObtaining resistance values of different temperature sections as kx + b linear function, wherein k is a linear parameter and b is a constant;
and 5: because the connecting cable has resistance error, the resistance value Y of the connecting cable is calibratedSign boardAnd is substituted into YMeasuring＝YCalculating out-YSign boardIn (1), a resistance signal is output by a pipx40_ resSetResistance () function;
step 6: judging whether the output resistance signals are consistent through an EICAS display and a flight parameter collector line detection device of the aircraft avionics system, if so, searching error reasons, stopping detection and eliminating aircraft faults; if the detection result is the same, the detection personnel determines whether to quit, if so, the step 7 is carried out, otherwise, the step 5 is skipped to continue the detection;
and 7: the programmable resistance module is turned off by the pipx40_ close () function.
2. The method for on-line detection of simulation engine oil temperature and avionics system cross-linking of claim 1, wherein the on-line detection software employs LabWindows/CVI virtual instrument technology as a support platform.
3. The method for simulating the cross-linking online detection of the engine oil temperature and the avionics system as claimed in claim 1, wherein the detection device is provided with a 50-297- > 130 high-density program-controlled resistance module and a set of test cables from pickering corporation.
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