CN105068450A - Thermal resistance simulation device and method for hardware in loop simulation system - Google Patents
Thermal resistance simulation device and method for hardware in loop simulation system Download PDFInfo
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- CN105068450A CN105068450A CN201510527972.0A CN201510527972A CN105068450A CN 105068450 A CN105068450 A CN 105068450A CN 201510527972 A CN201510527972 A CN 201510527972A CN 105068450 A CN105068450 A CN 105068450A
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Abstract
The present invention relates to a thermal resistance simulation device and a method for hardware in loop simulation system. The thermal resistance simulation device provided by the invention comprises a single chip microcomputer system module, a driver, a stepping motor and a coaxial duplex potentiometer. A thermal resistance sensor temperature value requiring to be simulated is received by the single chip microcomputer system module from an upper computer, and a resistance value which should be outputted is calculated; the coaxial duplex potentiometer includes a potentiometer RP1 and a potentiometer RP2, the RP1 being connected with the single chip microcomputer system module, the RP2 being used for simulation of outputting of the thermal resistance temperature sensor; the stepping motor is connected with the coaxial duplex potentiometer to drive the rotation of the coaxial duplex potentiometer; and the single chip microcomputer system module is configured to measure the RP1 resistance which is taken as a independent variable, linear interpolation is performed in the relational data table of the angle of the coaxial duplex potentiometer, the RP1 resistance and the RP2 resistance, and the RP2 resistance is calculated. With taking the difference of the output resistance required by the sensor and the RP2 as a feedback, the closed-loop control of the coaxial duplex potentiometer is realized through the stepping motor driven by the driver, so that the simulation thermal resistance output resistance of the RP2 is in accordance with the output resistance required by the sensor.
Description
Technical field
The present invention relates to technical field of measurement and test, be specially a kind of thermal resistance simulation device and method for Hardware-in-the-loop simu-lation system.
Background technology
At aerospace field, the engine of aircraft is furnished with independently airborne Measurement &control computer, is controlled engine condition by measurement engine current operating parameters and atmospheric environmental parameters.
When airborne Measurement &control computer system hardware and software has designed, for the function of verification system, usual need carry out Hardware-in-the-loop simu-lation (HardwareinLoopSimulation) system test, that is: airborne Measurement &control computer adopts in kind, the engine measuring sensor be attached thereto is exported acting device with control and is simulated by program control software and hardware system, for airborne Measurement &control computer is built with it at the identical peripheral electrical interface environment of machine real work situation, thus make airborne Measurement &control computer can realize full working scope running to carry out examining to its observing and controlling function and to verify.
In the peripheral signal that airborne Measurement &control computer gathers, wherein a class is temperature parameter, generally comprise fuel oil temperature, oil temperature, atmospheric temperature etc., these parameter great majority are obtained by thermal resistance temperature sensor, and its characteristic is the pure resistance output varying with temperature and change.In Hardware-in-the-loop simu-lation system test, owing to there is no true thermal source as the temperature environment of sensor measurement, therefore usual by technological approaches provide variable resistance simulate thermal resistance temperature sensor export (abbreviation thermal resistance simulation).
At present, in technical field of measurement and test, thermal resistance simulation comprises following three class methods:
1. set resistance corresponding to different temperatures by multiple multiturn potentiometer, program control relay is adopted to switch the resistance exporting and require, typical disclosed in public announcement of a patent application CN103309345A, the limitation of the method is that the Standard resistance range exported is stepping, cannot realize the stepless output of resistance.
2. realize resistance by the electronic potentiometer of digital spc formula to export, typical disclosed in public announcement of a patent application CN103196582A, the limitation of the method is by electronic chip output resistance, and what therefore export is not pure resistance.
3. form one-port network by operational amplifier and digital to analog converter etc., the electrical specification of simulation thermal resistance, typical disclosed in public announcement of a patent application CN103017941A, the limitation of the method be modulating output be not resistance, but the external characteristic of thermal resistance place in circuit.
In airborne Measurement &control computer Hardware-in-the-loop simu-lation system test, require that the thermal resistance temperature sensor of simulation exports the pure resistance for realizing stepless adjustable (corresponding arbitrary temp), obviously above-mentioned three class methods do not meet the demands.At present, the method adopted in test is by high precision and has the potentiometer of good linearity, the resistance of potentiometer and position are calibrated, the resistance realizing requiring by controlling potential device position exports, the weak point of the method, one is that the potentiometer adopted makes cost higher because precision prescribed is high; Two is adopt opened loop control to the position of potentiometer, affects the accuracy that thermal resistance simulation exports.
Summary of the invention
The technical matters solved
Technical matters to be solved by this invention is, for in current aircraft engine airborne Measurement &control computer Hardware-in-the-loop simu-lation system, adopt high precision potentiometer and the high deficiency with thermal resistance simulation output accuracy can not be ensured of the cost of potentiometer outgoing position employing existing for opened loop control, propose a kind of thermal resistance simulation device and method.
Technical scheme
For a thermal resistance simulation device for Hardware-in-the-loop simu-lation system, it is characterized in that comprising Single Chip Microcomputer (SCM) system module, driver, stepper motor and co-shaft duplex potentiometer; Single Chip Microcomputer (SCM) system module is connected with host computer for receiving the thermal resistance sensor temperature value requiring to export, and is connected the resistance for gathering co-shaft duplex potentiometer with co-shaft duplex potentiometer, is connected is used for Driving Stepping Motor with driver; Stepper motor is connected with co-shaft duplex potentiometer and drives co-shaft duplex potentiometer to rotate.
Described Single Chip Microcomputer (SCM) system module comprises and carries 12 A/D conversion, the C8051F020 single-chip microcomputer of reference voltage and serial RS232 communication interface and precision resistance.
Described precision resistance selects precision to be 0.05%, and resistance is the resistance of 200 Ω.
Described co-shaft duplex potentiometer comprise two electrically on independently adjustable potentiometer RP1 and RP2, wherein the A-B section of RP1 connect with precision resistance, and the A'-B' section of RP2 simulates thermal resistance temperature sensor output.
Described co-shaft duplex potentiometer is multiturn potentiometer, and resistance is 2k Ω, and slewing area is 10 circles.
Described driver has segmentation function.
For a thermal resistance simulation method for Hardware-in-the-loop simu-lation system, step is as follows:
Step 1: control step motor belt motor turns co-shaft duplex potentiometer and rotates to potentiometer resistance maximum rating from the closed condition that resistance is 0, each circle rotation 120 step, the A-B section of every one-step recording co-shaft duplex potentiometer RP1, the A'-B' section resistance of RP2, record forms co-shaft duplex potentiometer angle-RP1 resistance-RP2 value relatable tables of data;
Step 2: Single Chip Microcomputer (SCM) system module receives the thermal resistance sensor temperature value requiring simulation from host computer, calculates the corresponding resistance exported by sensor temperature-resistance characteristic;
Step 3: the precision resistance of Single Chip Microcomputer (SCM) system module is connected with the A-B section of co-shaft duplex potentiometer RP1, and is powered by the reference voltage of single-chip microcomputer, wherein the A-B section dividing potential drop of RP1 connects the A/D end of single-chip microcomputer, calculates resistance corresponding to RP1 by single-chip microcomputer collection;
Step 4: RP1 resistance above-mentioned steps 3 recorded is as independent variable, in co-shaft duplex potentiometer angle-RP1 resistance-RP2 value relatable tables of data that step 1 obtains, carry out linear interpolation, calculate the A'-B' section resistance of co-shaft duplex potentiometer position angle and RP2;
Step 5: according to the difference of the resistance that above-mentioned steps 2 and step 4 obtain, adopts pid control algorithm to carry out closed-loop control to stepper motor, finally makes the A'-B' section resistance of co-shaft duplex potentiometer RP2 consistent with the resistance that sensor should export.
Beneficial effect
In aerospace flight vehicle engine airborne Measurement &control computer Hardware-in-the-loop simu-lation system test, by device and method provided by the invention, the resistance adopting low cost, the linearity to simulate thermal resistance temperature sensor without the co-shaft duplex potentiometer of particular/special requirement exports, stepless adjustable pure resistance can not only be realized accurately export, and can reduce costs.
Accompanying drawing explanation
The co-shaft duplex potentiometer configuration and principle schematic diagram that Fig. 1 adopts for the embodiment of the present invention
Fig. 2 is thermal resistance simulation schematic diagram of device of the present invention
In figure: 1-Single Chip Microcomputer (SCM) system module, 2-driver, 3-stepper motor, 4-co-shaft duplex potentiometer.
Embodiment
Now in conjunction with the embodiments, the invention will be further described for accompanying drawing:
As Fig. 2, the present embodiment is used for the thermal resistance class temperature sensor output resistance simulation in aerospace flight vehicle engine airborne Measurement &control computer Hardware-in-the-loop simu-lation system test, and device specifically comprises Single Chip Microcomputer (SCM) system module 1, driver 2, stepper motor 3, co-shaft duplex potentiometer 4.
Single Chip Microcomputer (SCM) system module 1 comprises single-chip microcomputer and precision resistance; Wherein the C8051F020 single-chip microcomputer carrying 12 A/D conversion, reference voltage and serial RS232 communication interface selected by single-chip microcomputer, serial RS232 communication interface is connected for receiving the thermal resistance sensor temperature value requiring to export with host computer, precision resistance is connected with the A-B section of co-shaft duplex potentiometer RP1, and powered by the reference voltage of single-chip microcomputer, single-chip microcomputer is connected with precision resistance and is used for measuring voltage, and described precision resistance selects the resistance that precision is 0.05%, resistance is 200 Ω.Described Single Chip Microcomputer (SCM) system module receives the thermal resistance sensor temperature value requiring simulation from host computer, calculate the resistance that should export.
Driver 2 Driving Stepping Motor 3, stepper motor 3 is connected with the rotating shaft of co-shaft duplex potentiometer 4 and is used for band and turns co-shaft duplex potentiometer 4 and rotate, because load is little, angular resolution requires higher, therefore selects 28HB3302 type low-power stepper motor to join MD415 type subdivision driver.
Co-shaft duplex potentiometer 4, comprise two electrically on independently adjustable potentiometer RP1 and RP2, wherein RP1 connect with precision resistance, the output of RP2 simulation thermal resistance temperature sensor.Co-shaft duplex potentiometer 4 is multiturn potentiometer, and nominal resistance is consistent with simulated thermal resistance temperature sensor output area.In the present embodiment, co-shaft duplex potentiometer is to simulate PT1000 thermal resistance temperature sensor for object, and nominal resistance is 2k Ω, and slewing area is 10 circles.
Foundation of the present invention with principle is: described co-shaft duplex potentiometer, is equivalent to two potentiometers, is structurally coaxial, can realizes synchronous axial system; Independent, unrelated mutually on electrically.To co-shaft duplex potentiometer finished product, the Standard resistance range of two potentiometers is roughly the same, precision within the scope of whole change in resistance and the linearity inconsistent, when rotating shaft is in any position, the resistance value of two potentiometers is also incomplete same, but in the whole working ranges of rotating shaft from minimum to maximum, under each position, two potentiometers resistance resistance value is separately determined, namely each potentiometer meets resistance-position and determines relation.Because two potentiometers are coaxial, therefore at rotating shaft position,---resistance of potentiometer RP1---has the corresponding relation determined between the resistance of potentiometer RP2, and this relation can be classified as tables of data.
The resistance requiring simulation is accurately exported for making potentiometer RP2, the resistance of potentiometer RP1 is measured by described Single Chip Microcomputer (SCM) system module, and according to potentiometer RP1 resistance, the relation of RP2 resistance and rotating shaft position, by the theoretical output resistance of potentiometer RP2 under linear interpolation calculating same position, contrast with the resistance that this resistance value is corresponding with the resistance and temperature value requiring to export, according to both differences, described stepper motor is driven to rotate, realize described co-shaft duplex potentiometer rotating shaft position closed-loop control, thus realize potentiometer RP2 and accurately export the resistance requiring temperature value corresponding.
Composition graphs 2, will introduce implementation procedure of the present invention below in detail.
Step one: by described mcu programming, each circle rotation 120 step of control step motor, band turns described co-shaft duplex potentiometer and rotates to potentiometer resistance maximum rating from the closed condition that resistance is 0, in the A-B section of every one-step recording co-shaft duplex potentiometer RP1, the A'-B' section resistance of RP2 of stepper motor running, record forms co-shaft duplex potentiometer angle---RP1 resistance---RP2 value relatable tables of data, and leave in single-chip microcomputer, as the basic database of follow-up co-shaft duplex potentiometer position control.
Step 2: described Single Chip Microcomputer (SCM) system receives the thermal resistance sensor temperature value requiring simulation from host computer by RS232 communication; By sensor temperature-resistance characteristic, the resistance that calculating sensor should export;
Step 3: adopt precision to be 0.05%, resistance is that the precision resistance of 200 Ω is connected with the A-B section of RP1 and accessed Chip Microcomputer A/D and hold, single-chip microcomputer gathers dividing potential drop and calculates output resistance corresponding to RP1: the precision resistance of described Single Chip Microcomputer (SCM) system is connected with the A-B section of described co-shaft duplex potentiometer RP1, and powered by the reference voltage of described single-chip microcomputer, wherein the A-B section of RP1 divides the A/D crimping described single-chip microcomputer end, calculates resistance corresponding to RP1 by single-chip microcomputer collection;
Step 4: RP1 resistance above-mentioned steps three recorded is as independent variable, in co-shaft duplex potentiometer angle-RP1 resistance-RP2 value relatable tables of data that step one obtains, carry out linear interpolation, calculate the A'-B' section resistance of co-shaft duplex potentiometer position angle and RP2;
Step 5: according to the difference of the resistance that above-mentioned steps two and step 4 obtain, adopt pid control algorithm to carry out closed-loop control to stepper motor, final utilization is consistent with the resistance that sensor should export in the A'-B' section resistance of the co-shaft duplex potentiometer RP2 that simulation thermal resistance sensor exports.
More than describe specific embodiments of the invention with reference to the accompanying drawings, but and be not used to limit the present invention, any person of ordinary skill in the field, not departing from the spirit and scope of the present invention, also can do to change and replace to the specific embodiment of the present invention, these change and all drop in scope that claims of the present invention limits with replacing.
Claims (7)
1., for a thermal resistance simulation device for Hardware-in-the-loop simu-lation system, it is characterized in that comprising Single Chip Microcomputer (SCM) system module (1), driver (2), stepper motor (3) and co-shaft duplex potentiometer (4); Single Chip Microcomputer (SCM) system module (1) is connected for receiving the thermal resistance sensor temperature value requiring to export with host computer, being connected the resistance for gathering co-shaft duplex potentiometer (4) with co-shaft duplex potentiometer (4), being connected with driver (2) and being used for Driving Stepping Motor (3); Stepper motor (3) is connected with co-shaft duplex potentiometer (4) and drives co-shaft duplex potentiometer (4) to rotate.
2. thermal resistance simulation device according to claim 1, is characterized in that described Single Chip Microcomputer (SCM) system module (1) comprises and carries 12 A/D conversion, the C8051F020 single-chip microcomputer of reference voltage and serial RS232 communication interface and precision resistance.
3. thermal resistance simulation device according to claim 2, it is characterized in that described precision resistance selects precision to be 0.05%, resistance is the resistance of 200 Ω.
4. thermal resistance simulation device according to claim 1, it is characterized in that described co-shaft duplex potentiometer (4) comprise two electrically on independently adjustable potentiometer RP1 and RP2, wherein the A-B section of RP1 is connected with precision resistance, and the A'-B' section simulation thermal resistance temperature sensor of RP2 exports.
5. thermal resistance simulation device according to claim 4, it is characterized in that described co-shaft duplex potentiometer (4) is multiturn potentiometer, resistance is 2k Ω, and slewing area is 10 circles.
6. thermal resistance simulation device according to claim 1, is characterized in that described driver (2) has segmentation function.
7. adopt a method for thermal resistance simulation unit simulation thermal resistance according to claim 4, it is characterized in that step is as follows:
Step 1: control step motor belt motor turns co-shaft duplex potentiometer and rotates to potentiometer resistance maximum rating from the closed condition that resistance is 0, each circle rotation 120 step, the A-B section of every one-step recording co-shaft duplex potentiometer RP1, the A'-B' section resistance of RP2, record forms co-shaft duplex potentiometer angle-RP1 resistance-RP2 value relatable tables of data;
Step 2: Single Chip Microcomputer (SCM) system module receives the thermal resistance sensor temperature value requiring simulation from host computer, calculates the corresponding resistance exported by sensor temperature-resistance characteristic;
Step 3: the precision resistance of Single Chip Microcomputer (SCM) system module is connected with the A-B section of co-shaft duplex potentiometer RP1, and is powered by the reference voltage of single-chip microcomputer, wherein the A-B section dividing potential drop of RP1 connects the A/D end of single-chip microcomputer, calculates resistance corresponding to RP1 by single-chip microcomputer collection;
Step 4: RP1 resistance above-mentioned steps 3 recorded is as independent variable, in co-shaft duplex potentiometer angle-RP1 resistance-RP2 value relatable tables of data that step 1 obtains, carry out linear interpolation, calculate the A'-B' section resistance of co-shaft duplex potentiometer position angle and RP2;
Step 5: according to the difference of the resistance that above-mentioned steps 2 and step 4 obtain, adopts pid control algorithm to carry out closed-loop control to stepper motor, finally makes the A'-B' section resistance of co-shaft duplex potentiometer RP2 consistent with the resistance that sensor should export.
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| CN109686516A (en) * | 2019-01-21 | 2019-04-26 | 上海图菱新能源科技有限公司 | The continuous potentiometer of number |
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