CN114136629A - Digital accelerator device and test bed accelerator signal simulation system - Google Patents
Digital accelerator device and test bed accelerator signal simulation system Download PDFInfo
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- CN114136629A CN114136629A CN202111223500.8A CN202111223500A CN114136629A CN 114136629 A CN114136629 A CN 114136629A CN 202111223500 A CN202111223500 A CN 202111223500A CN 114136629 A CN114136629 A CN 114136629A
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- G01M15/00—Testing of engines
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Abstract
The application provides a digital accelerator device and test bed throttle signal analog simulation system, belong to aeroengine test technical field, specifically include power module, communication protocol conversion module, the DDS module, the voltage amplification module, frequency voltage conversion module and logic adaptation/conversion circuit, frequency voltage conversion module is used for gathering the excitation signal frequency value of digital electronic controller output, communication protocol conversion module is used for receiving required throttle angle eigenvalue and converts it into SPI serial communication signal, logic adaptation/conversion circuit is used for sending serial operating data to the DDS module after SPI serial communication signal logic adaptation conversion, the DDS module is according to serial operating data simulation throttle angle and is resolved the signal, voltage amplification module is used for enlarging the output with the analog result. Through the processing scheme of this application, accessible host computer software realizes the manual/automatic operation of throttle lever angle on the aeroengine test bed, improves control accuracy, signal stability and interference killing feature.
Description
Technical Field
The application relates to the technical field of aero-engine tests, in particular to a digital accelerator device and a test bed accelerator signal simulation system.
Background
Currently, aircraft engine control systems have completed the transition from mechanical hydraulic control to FADEC (full authority digital electronic controller). Meanwhile, the throttle lever of the aircraft engine test bed is gradually developed to the current throttle angular displacement sensor control mode from the initial mechanical link type and the follow-up improved servo motor mode.
At present, the state control of the engine is generally realized by adopting a throttle lever angular displacement sensor mode in the domestic aeroengine test bed, and the throttle angular displacement of the engine mostly adopts sensors in the forms of a potentiometer, a rotary differential transformer, a sine and cosine rotary transformer and the like. The basic principle is that an angular displacement sensor is assembled on a mechanical accelerator handle, the angle change of the angular displacement sensor is driven by a mechanical transmission interface, and then a digital electronic controller resolves an angular displacement electrical signal to further control the fuel supply quantity of an engine. Compared with a mechanical connecting rod type, the mode has the advantages of high electrification degree, simple control mode, high control precision and low failure rate, thereby being widely applied.
However, as the angular displacement sensor control mode is found in the long-term use of the aeroengine test bed, the control mode still has some defects:
1) when the state of the engine changes, the speed, the precision and the fine adjustment of the push rod of the accelerator all depend on the experience of operators, so that the accurate control is difficult, and errors can be caused.
2) Secondly, during the test run process, especially during the long-term test run, the working strength of the test run operator is extremely high. Many scientific research institutes in China are developing the technical research of automatic test run of aero-engines, and a throttle lever system which can receive external instructions for automatic execution and can interact with test bed data acquisition and industrial control equipment is urgently needed.
3) The scientific research test bed faces to various engines, throttle lever sensors needing to be configured are different in type, and the initial installation position needs to be adjusted repeatedly when the sensors are replaced, so that angle calibration is carried out again. And the special throttle lever sensor has extremely long purchase period, high price and serious phenomena of idling and difficult maintenance.
4) In addition, after the angular displacement sensor is used for a long time, the phenomena of mechanical clamping stagnation, performance attenuation and the like exist, and the sensor has a long circuit and is very easy to be subjected to electromagnetic interference when being not properly processed.
5) In addition, the resolver type sensor output signal is typically characterized as an ac signal in a sine/cosine waveform of several kilohertz, which cannot be generated and identified by the industrial control module of the test bed. With the requirements of automation and intellectualization of an aircraft engine test bed and comprehensive diagnosis of fault information, the throttle lever control signal is used as a key decision signal for the test process and the judgment of the engine state, and can only be acquired and resolved by an engine digital electronic controller, so that the requirement of the new aircraft engine test bed on the automatic test can not be met.
Disclosure of Invention
In view of this, the embodiment of the present application provides a digital accelerator device and a test bed accelerator signal analog simulation system, which are used to replace various types of accelerator rod angular displacement sensors and accelerator rod angle characteristic signals required by a high-precision analog/simulation engine digital electronic controller, and have automatic functions such as impedance matching, angle calibration and online correction, and manual automatic control, so as to greatly improve the automation and intelligence levels of an aircraft engine test bed test.
In a first aspect, an embodiment of the present application provides a digital throttle device for replacing a throttle lever angular displacement sensor of an aircraft engine test bed, the digital throttle device includes: the accelerator angle control device comprises a power module, a communication protocol conversion module, a DDS (direct digital synthesizer) module, a voltage amplification module, a frequency-voltage conversion module and a logic adaptation/conversion circuit, wherein the frequency-voltage conversion module is used for collecting the frequency value of an excitation signal of an accelerator angle displacement sensor output by an engine digital electronic controller, the communication protocol conversion module is used for receiving a required accelerator angle characteristic value and converting the accelerator angle characteristic value into an SP I serial communication signal, the logic adaptation/conversion circuit is used for transmitting serial operation data to the DDS module after the SP I serial communication signal is subjected to logic adaptation conversion, the DDS module simulates an accelerator angle resolving signal according to the serial operation data, and the voltage amplification module is used for amplifying and outputting the simulation result.
According to a specific implementation manner of the embodiment of the application, the digital accelerator device is in communication connection with an external control computer/PLC, and the accelerator angle characteristic values are frequency, amplitude and phase of a required analog signal obtained by resolving according to a required accelerator angle through the external control computer/PLC; the DDS module is a digital hardware circuit adopting a DDS chip and is used for receiving the frequency, the amplitude and the phase of the analog signal sent by the serial port, carrying out direct digital frequency synthesis and simulating an accelerator angle resolving signal.
According to a concrete implementation manner of this application embodiment, logic adaptation/conversion circuit is inside to be equipped with logic conversion circuit, logic conversion circuit be used for with the control signal of communication protocol conversion module output converts into the required control signal of DDS module, the control signal of communication protocol conversion module output includes clock signal, data owner output/supplementary input signal, data owner input/supplementary output signal, chip selection signal, and the required control signal of DDS module includes that clock signal, control register accept/send data signal, output update signal.
According to a specific implementation manner of the embodiment of the application, an impedance matching unit for simulating an accelerator angle resolving signal is further arranged in the logic/conversion circuit and is used for matching loop impedances of an excitation end and an acquisition end of a digital electronic controller of the engine and matching the impedance of an output end of the voltage amplification module.
According to a specific implementation manner of the embodiment of the application, the impedance matching unit for simulating the throttle angle resolving signal adopts a signal isolation transformer to match the impedance.
According to a specific implementation manner of the embodiment of the application, a phase detection and synchronization unit is further arranged inside the logic adaptation/conversion circuit, and the phase detection and synchronization unit is used for keeping the phase of the output signal of the DDS module and the phase of the excitation signal of the digital electronic engine controller synchronous.
According to a specific implementation mode of the embodiment of the application, a signal resolving unit is further arranged inside the logic adaptation/conversion circuit and used for monitoring the simulated throttle angle resolving signal output by the voltage amplification module in real time and achieving an automatic correction function by matching with an external control computer/PLC.
According to a specific implementation manner of the embodiment of the application, a reset unit is further arranged in the logic adaptation/conversion circuit and used for resetting a control register and a data register in the DDS module after the digital accelerator device is powered on or when a reset switch is pressed down.
According to a specific implementation manner of the embodiment of the application, the analog throttle angle resolving signal of the digital throttle device can respectively simulate a rotary differential transformer signal, a sine and cosine rotary transformer signal or a potentiometer signal.
In a second aspect, the embodiment of the present application further provides a test bed throttle signal simulation system, which is characterized in that the system includes an external control computer/PLC, an engine digital electronic controller and the digital throttle device of any of the above first aspect embodiments, the digital throttle device receives the throttle angle characteristic value output by the external control computer/PLC to simulate a throttle angle resolving signal, and outputs the throttle angle resolving signal to the engine digital electronic controller.
Advantageous effects
Digital throttle device and test bed throttle signal analog simulation system in this application embodiment, have hand/automatic control function, the cost of using manpower sparingly, digital throttle device has two kinds of modes of manual and automatic control, the automatic mode can be according to the experimental task demand, the preset angle, time isoparametric, plan throttle angle signal curve, convenient to use is swift, a key formula is automatic to be carried out, the unnecessary labour has been liberated, the efficiency and the degree of automation of taking a trial run have been improved, the maloperation that the artificial reason leads to has been stopped. Meanwhile, the manual control mode is provided, and the two modes can be freely selected and switched, so that safety requirements such as special operation requirements and emergency operation are met.
The performance is stable, the control precision is high, and the ideal output characteristic of the angular displacement sensor can be approximately simulated. The accelerator device provided by the invention adopts the electronic circuit with the DDS chip as the core to simulate the accelerator signal, and compared with the angular displacement sensor signal, the accelerator device has the performance of more stable output signal amplitude and the resolution ratio can reach
High output linearity and better repeatability of forward and backward strokes. The analog signal transmission line can be shortened, the external interference is not easy to cause, and the like, and the output angle and the change curve can be accurately controlled through upper computer software.
Complete functions, simple operation and low cost. The device has the functions of impedance matching, signal simulation of various throttle angular displacement sensors, position calibration, automatic correction and the like. The trouble of replacing the sensor or even the mechanical handle back and forth is avoided, the purchasing period is saved, the installation interface processing and installation and correction procedures are saved, and the test preparation efficiency of the test bed of the aero-engine is improved.
The control signal is associated with the electrical control system of the rack and the electrical control system of the engine, so that the integrated control and the comprehensive diagnosis of fault information of the engine and the rack equipment are facilitated, and a key foundation is laid for an automatic test run technology.
The serial port program control digital throttle device based on the DDS chip designs the output of various types of simulated throttle angle resolving signals, combines the core signal requirements of an aircraft engine digital electronic controller, and effectively simulates the throttle signal characteristic values of various types of aircraft engines. Can realize the manual/automatic operation of throttle lever angle on the aeroengine test bed through host computer software to can guarantee good control accuracy, the stability and the interference killing feature of signal, it is effectual to use in the aeroengine test.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a block diagram of a test bed throttle signal simulation/emulation system according to an embodiment of the present invention;
FIG. 2 is an electrical schematic of a digital throttle device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the internal structure of a logic/conversion circuit according to an embodiment of the present invention;
FIG. 4 is a control logic diagram of the operating software for the digital throttle device according to one embodiment of the present invention;
FIG. 5 shows simulation results of a resolver type angular displacement sensor according to an embodiment of the present invention;
fig. 6 shows simulation results of a sine-cosine resolver type angular displacement sensor according to an embodiment of the present invention.
Detailed Description
The embodiments of the present application will be described in detail below with reference to the accompanying drawings.
The following description of the embodiments of the present application is provided by way of specific examples, and other advantages and effects of the present application will be readily apparent to those skilled in the art from the disclosure herein. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. The present application is capable of other and different embodiments and its several details are capable of modifications and/or changes in various respects, all without departing from the spirit of the present application. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the present application, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present application, and the drawings only show the components related to the present application rather than the number, shape and size of the components in actual implementation, and the type, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.
In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.
Researches find that the automatic test run functions of foreign aeroengines are deeply integrated in a data acquisition system, so that the generation of simulated throttle angle resolving signals is widely performed by adopting a data acquisition integrated board card. For example, the Saifeng group and the MDS are core engine test beds constructed by Shanghai commercial engine Limited companies, namely the signal generating device based on the PXI board card of the NI company is adopted, and the automatic control of the accelerator angle can be realized according to the requirement of a test task. However, data acquisition systems of foreign manufacturers are expensive, long in purchase period, incapable of being controlled independently, untimely in subsequent upgrading and maintenance response and the like, and are relatively complicated to lap with other industrial control equipment of the domestic vehicle platform.
Aiming at the problems, a set of digital device which is programmable, has simple and universal interfaces and can simulate the accelerator angle resolving signals of various FADEC numerical control systems with signal characteristics is urgently needed, high-precision angle displacement sensor simulation equipment (namely, the output of an analog angle displacement sensor) capable of flexibly controlling the accelerator angle displacement can be used for replacing an accelerator handle and the angle displacement sensor to send the accelerator angle signals to an engine digital electronic controller, and therefore the requirements of the related technical research of the automatic test run of an aero-engine and the use requirements of the whole test bed control system on the accelerator resolving signals are met.
The embodiment of the application provides a digital accelerator device, which is a core component of an accelerator signal simulation/emulation system of an engine test bed and is divided into two parts, namely angular displacement signal simulation hardware and accelerator signal simulation control software. The test bed throttle signal simulation/simulation system is shown in the figure 1, hardware comprises an industrial control computer, a PLC (programmable logic controller) controller, a digital throttle device, an engine digital electronic controller, a switch, a display, test bed flight/landing state simulation equipment and the like, and control software for simulating a throttle angle resolving signal is installed in the industrial control computer and the PLC.
When the accelerator angle calculation device is used specifically, an operator selects a manual/automatic working mode through a human-computer interface, transmits the engine state/accelerator lever angle value to a PLC lower computer for analysis and calculation, obtains the characteristic values (frequency, amplitude and phase) of a required simulated accelerator angle calculation signal, sends instruction data to a digital accelerator device through an RS232 communication interface, and controls a DDS module to simulate and output accelerator characteristic signals which can be identified by an engine digital electronic controller. Meanwhile, the test bed control system PLC can control the test bed flying/attaching state simulation equipment to complete the test task of the engine according to the current throttle state and the test task requirement.
The digital accelerator device is described in detail below with reference to the accompanying drawings, and is used for replacing an accelerator rod angular displacement sensor of an aircraft engine test bed. Specifically, referring to fig. 2, the digital throttle device includes: a power supply module, a communication protocol conversion module, a DDS module, a voltage amplification module, a frequency-voltage conversion module and a logic/conversion circuit, the frequency-voltage conversion module is used for collecting the frequency value of the excitation signal of the accelerator angle sensor output by the digital electronic controller of the engine, the communication protocol conversion module is used for receiving the required throttle angle characteristic value and converting the characteristic value into an SPI serial communication signal, the logic/conversion circuit is used for transmitting serial operation data to the DDS module after the SPI serial communication signal is logically adapted and converted, the DDS module simulates an accelerator angle resolving signal according to the serial operation data, the voltage amplification module is used for amplifying and outputting the simulation result, a specific electrical connection structure is shown in figure 2, and a power supply interface, a sensor signal interface, a reset signal interface and a serial communication interface are reserved outside the DDS module by adopting an electric connector.
Specifically, the digital accelerator device adopts a 28V direct-current power supply of an engine control system to supply power so as to ensure that the whole device circuit is grounded with an engine numerical control system, ensure a common reference point and avoid the condition that a voltage difference between GND and GND is introduced into a digital controller to damage an input detection circuit. The power supply module provides required working power supply for the voltage amplification module, the DDS module, the frequency-voltage conversion module, the logic/conversion circuit and the communication protocol conversion module respectively.
After the system is powered on and reset, a PLC controller of the test bed acquires the excitation signal frequency value of an accelerator angle sensor output by a digital electronic controller of an engine through a frequency-voltage conversion module, then sends a control command to a digital accelerator device through a serial communication interface according to the required accelerator angle characteristic value, an RS232/SPI communication conversion module converts received serial data into SPI serial communication signals, and then sends serial operation data to a DDS module after the serial communication signals are subjected to logic adaptation conversion through a logic/conversion circuit, and a DDS chip simulates the frequency, the amplitude and the phase of an accelerator angle resolving signal according to the operation data and outputs the frequency, the amplitude and the phase of the accelerator angle resolving signal through a rear-stage voltage amplification module.
In particularThe DDS module is a core component of the digital accelerator device and mainly carries out direct digital frequency signal synthesis, and the DDS chip has frequency, phase and amplitude control words and can output sinusoidal signals with independently controlled frequency, amplitude and phase at high speed. The output signal of the rotary-change type angular displacement sensor is generally a sine model with certain frequency and phase and amplitude changing along with the angle, so that the DDS chip is arranged to work in a single-tone mode. The amplitude linearity and the stability of the output signal of the DDS chip are high, but the signal amplitude range is small, the output stage is matched with a precision voltage amplifier module, and the amplitude of the output signal can reach +/-5VPPThe amplitude range of the throttle angular displacement signal required by the conventional main stream engine controller can be completely covered by the signal characteristics, and different types of output amplification modules can be matched according to the use requirements by the modularized design. By adopting a six-bit semi-digital instrument for detection, when the amplitude control word of the DDS chip is fixed, the output fluctuation change of the precision voltage amplifier module is only within 1 mV.
Specifically, logic conversion circuit, the logic adaptation/conversion circuit in fig. 2 promptly is equipped with to logic conversion circuit inside of this application, logic conversion circuit be used for with the control signal conversion of communication protocol conversion module output is the required control signal of DDS module to and resolve the throttle angle sinusoidal signal of output into direct current signal, the control system of being convenient for is adopted back.
The logic adaptation/conversion circuit specifically comprises a logic adaptation unit, a phase synchronization trigger unit, a signal resolving unit, an excitation signal phase detection unit, a reset unit and an impedance matching unit, and refer to fig. 3.
In one embodiment, the logic gate circuit of the logic adaptation circuit converts the clock signal CLK _ I, the data output signal MOSI, the data input signal MISO, the chip select signals CS0, CS1, etc. of the communication protocol conversion module into the clock signal CLK _ O, the register write data signal SDIO0, the register read data signal SDIO2, and the DDS chip update signal IOUP required by the DDS module through logic operation.
And the impedance matching unit in the logic/conversion circuit adopts a signal isolation transformer to match the impedance and is used for matching the impedance of the excitation end, the acquisition end and the output end of the voltage amplification module of the digital electronic controller of the engine. Specifically, the signal interface of the analog sensor of the digital accelerator device adopts a 6-wire system, wherein two wires are used for excitation detection, two wires are used as an output channel 1, and two wires are used as an output channel 2. The voltage amplification module has high output impedance and weak loading capacity, and the digital electronic engine controller generally has a power-on self-checking function, so that the direct-current resistance of loops of an excitation end and an acquisition end of the digital electronic engine controller is required to be ensured in order to avoid the disconnection fault of an accelerator sensor reported by a numerical control system. Comprehensively considering, the impedance of a signal interface needs to meet the requirements of the output of a voltage amplification module and the self-checking of a numerical control system, the excitation input and the analog output of the circuit adopt a signal isolation transformer to carry out impedance matching, and the circuit has the characteristics of low direct current impedance and high alternating current impedance and also has the electrical isolation function of signals.
Specifically, the logic/conversion circuit includes a phase detection unit (excitation signal phase detection unit) for synchronizing the phase of the output signal of the DDS module with the phase of the excitation signal of the digital electronic engine controller. Specifically, a voltage comparator in the phase detection unit obtains a square wave signal with the same frequency and the same phase through zero-crossing detection of an accelerator sensor excitation sine signal output by an engine digital electronic controller, the square wave signal is output through an AND gate to serve as a trigger pulse in the phase synchronization unit in the figure, a data signal of a trigger is a DDS output updating instruction (the duration is longer than the excitation signal period) sent by a PLC serial port of a test bed, an IOUP signal of a DDS chip is generated at the rising edge of the square wave, a data register of the DDS chip is immediately refreshed at the rising edge of the IOUP signal, a corresponding sine wave signal is output, and synchronization of the output signal and excitation is ensured.
Specifically, the signal calculating unit in the logic/conversion circuit is used for calculating and extracting the simulated throttle angle calculating signal output by the voltage amplifying module to monitor and correct in real time. Specifically, when the system is powered on or needs to be powered on, the control software of the control computer/PLC automatically calibrates the angle position of the accelerator, and records calibrated reference value data in the memory. The analog throttle angle resolving signal is amplified by the voltage module and then output to the digital electric controller of the engine, and the signal is parallelly collected and recovered to the ends Va and Vb of the resolving circuit, and the resolving circuit resolves and converts the sinusoidal signal into a linearly-changed direct-current voltage signal Vo +. And in the test process, the control computer/PLC acquires and resolves the feedback voltage Vo + of the circuit and reads a DDS chip data register to perform real-time state monitoring, device fault diagnosis and judgment, angle deviation warning and online automatic fine adjustment and correction.
Specifically, the reset unit in the logic/conversion circuit is configured to reset the control register and the data register in the DDS module after the digital accelerator device is powered on or when the reset switch is pressed. The reset circuit is controlled by an external control computer/PLC through an external lead, and RST level enters a DDS module reset pin after the system is powered on or a reset switch is pressed down, so that a DDS chip control register and a data register are reset.
In one embodiment, the analog throttle angle resolving signal of the digital throttle device can respectively simulate a rotary differential transformer signal, a sine and cosine rotary transformer signal or a potentiometer signal according to requirements.
In a second aspect, the embodiment of the application further provides a test bed throttle signal simulation system, which is characterized in that the system comprises a control computer/PLC, an engine digital electronic controller and any one of the first aspect of the digital throttle device, the digital throttle device receives a throttle angle characteristic value sent by the control computer/PLC and simulates a throttle angle resolving signal, and the throttle angle resolving signal is output to the engine digital electronic controller.
The throttle control software component is described in detail below.
According to the functional characteristics of the digital accelerator device and the application requirements of the digital accelerator device on a test run rack and an engine, a set of accelerator angular displacement signal control software suitable for test run of an aircraft engine is designed. The software is designed and developed based on upper/lower computer software of a test bed control system PLC, and the function introduction of the software is carried out by combining a control flow.
The control logic of the digital accelerator device control software is shown in fig. 4, and the digital accelerator device control software is divided into an emergency mode, a manual mode and an automatic mode according to execution functions.
The operation priority order is as follows: emergency stop, emergency slow running, micro increase/micro decrease adjustment, manual throttle mode status button, test card automatic execution.
The emergency mode has the highest priority, and the emergency stop priority is higher than the emergency slow vehicle priority. In any working state, when a fast-slow button is pressed down, the lower computer software accelerator angular displacement output required value is set as a slow vehicle domain, and is transmitted to an operation circuit of a digital accelerator device through communication to simulate and output a corresponding characteristic signal under the accelerator angle; when the emergency stop button is pressed, the lower computer software accelerator angle displacement output required value is set as a parking domain, and is transmitted to an operation circuit of the digital accelerator device through communication, and a corresponding characteristic signal under the accelerator angle is output in an analog mode.
In a non-emergency state, when the throttle mode is selected, a manual operation mode is entered, a push rod time set value is firstly input, and then the operation can be carried out in an N2 mode or a PLA mode directly on an operation interface according to the requirement of a test task. When the N2 mode is selected, an arbitrary N2 set value can be manually input, or a normal N2 state value (parking, 73%, 80%, 90% middle, small force application and maximum) can be selected by a shortcut button, and after a corresponding accelerator angle displacement value in the N2 state is calculated, the corresponding accelerator angle displacement value is transmitted to an arithmetic circuit of the digital accelerator device through communication, and a corresponding characteristic signal at the accelerator angle is output in an analog mode. When the PLA mode is selected, the throttle angle displacement set value is directly and manually input by the upper computer, and the throttle angle displacement set value is communicated to the lower computer to be operated and output a throttle angle characteristic signal.
In a non-emergency state, the accelerator angle characteristic signal can be automatically output according to a test requirement flow by an operator only by writing parameters such as a test engine state, push rod time, state retention time and the like into an Access table by the test card according to a standard format before a test and then reading in control software for identification. Meanwhile, the platform PLC control system can complete linkage control under each engine state according to the requirement of a test task, automatically execute a series of electrification control such as fuel oil circuit matching control, motor loading, hydraulic loading, auxiliary air system adjustment and the like, and simultaneously complete automatic data acquisition and recording, so that the integrated management of test platform flying/attaching state simulation is realized, and the automatic and intelligent test run becomes possible.
The digital accelerator device can simulate an angular displacement sensor in the forms of a rotary differential transformer, a sine-cosine rotary transformer, a potentiometer and the like.
a) Characteristics of the resolver angular displacement sensor:
excitation voltage: 3Vrms, 3000Hz, sine wave
Output characteristics: (Va-Vb)/(Va + Vb)
Measurement range: plus or minus 65 degrees (actual use range 120 degrees)
b) Characteristics of sine and cosine resolver type angular displacement sensor:
excitation signal: (7.07 + -0.16) Vrms, (3000 + -50) Hz, sine wave
Resolver angular range: 33.2 to 85.5 degrees (actual use range is 90 degrees)
Feedback signal: sinusoidal feedback Vs VR TR sin θ; cosine feedback Vc ═ VR ═ TR ═ cos θ; wherein VR is an excitation voltage; TR is 0.492 ± 0.025, and θ is the resolver angle.
c) Simulation results of the digital throttle device:
the results are shown in FIGS. 5 and 6. In addition, the 0-10V direct current signal output by the rotary differential transformer is resolved by the angular displacement sensor resolving chip and can also be used as a potentiometer type angular displacement sensor analog signal.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a digital throttle device for replace aeroengine test bench's throttle lever angular displacement sensor, its characterized in that, digital throttle device includes: the system comprises a power module, a communication protocol conversion module, a DDS module, a voltage amplification module, a frequency-voltage conversion module and a logic adaptation/conversion circuit, wherein the frequency-voltage conversion module is used for collecting the frequency value of an accelerator lever angular displacement sensor excitation signal output by an engine digital electronic controller, the communication protocol conversion module is used for receiving a required accelerator angle characteristic value and converting the accelerator angle characteristic value into an SPI serial communication signal, the logic adaptation/conversion circuit is used for transmitting serial operation data to the DDS module after the SPI serial communication signal is subjected to logic adaptation conversion, the DDS module simulates an accelerator angle resolving signal according to the serial operation data, and the voltage amplification module is used for amplifying and outputting a simulation result.
2. The digital throttle device according to claim 1, wherein the digital throttle device is in communication connection with an external control computer/PLC, and the throttle angle characteristic values are frequency, amplitude, phase of a desired analog signal obtained by the external control computer/PLC through calculation according to a desired throttle angle; the DDS module is a digital hardware circuit adopting a DDS chip and is used for receiving the frequency, the amplitude and the phase of the analog signal sent by the serial port, carrying out direct digital frequency synthesis and simulating an accelerator angle resolving signal.
3. The digital throttle device according to claim 1, wherein a logic conversion circuit is disposed inside the logic adaptation/conversion circuit, the logic conversion circuit is configured to convert the control signal output by the communication protocol conversion module into the control signal required by the DDS module, the control signal output by the communication protocol conversion module includes a clock signal, a data main output/auxiliary input signal, a data main input/auxiliary output signal, and a chip select signal, and the control signal required by the DDS module includes a clock signal, a control register receiving/sending data signal, and an output update signal.
4. The digital throttle device according to claim 3, wherein an impedance matching unit for simulating throttle angle resolving signals is further arranged in the logic/conversion circuit, and is used for matching loop impedances of an excitation end and a collection end of the digital electronic engine controller, and matching an impedance of an output end of the voltage amplification module.
5. The digital throttle device of claim 4, wherein the impedance matching unit uses a signal isolation transformer for impedance matching.
6. The digital throttle device according to claim 3, wherein a phase detection and synchronization unit is further provided inside the logic adaptation/conversion circuit, and the phase detection and synchronization unit is used for keeping the phase of the DDS module output signal synchronized with the phase of the engine digital electronic controller excitation signal.
7. The digital throttle device according to claim 3, wherein a signal calculating unit is further arranged inside the logic adapting/converting circuit, and the signal calculating unit is used for monitoring the analog throttle angle calculating signal output by the voltage amplifying module in real time and realizing an automatic correction function by being matched with an external control computer/PLC.
8. The digital throttle device of claim 3, wherein a reset unit is further disposed in the logic adapting/converting circuit, and is configured to reset the control register and the data register in the DDS module after the digital throttle device is powered on or when a reset switch is pressed.
9. The digital throttle device of claim 1, wherein the analog throttle angle resolving signal of the digital throttle device can respectively simulate a resolver signal, a sine and cosine resolver signal, or a potentiometer signal.
10. The test bed throttle signal analog simulation system is characterized by comprising an external control computer/PLC, an engine digital electronic controller and the digital throttle device as claimed in any one of claims 1 to 8, wherein the digital throttle device receives a throttle angle characteristic value sent by the external control computer/PLC to simulate a throttle angle resolving signal and outputs the simulated throttle angle resolving signal to the engine digital electronic controller.
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