CN101183045B

CN101183045B - Airplane engines ground starting up system tester

Info

Publication number: CN101183045B
Application number: CN2007101684446A
Authority: CN
Inventors: 何平; 万启星; 饶建英
Original assignee: Jiangxi Hongdu Aviation Industry Group Co Ltd
Current assignee: Jiangxi Hongdu Aviation Industry Group Co Ltd
Priority date: 2007-11-22
Filing date: 2007-11-22
Publication date: 2011-05-11
Anticipated expiration: 2027-11-22
Also published as: CN101183045A

Abstract

The invention provides an inspection instrument for a ground starting system of a plane engine and comprises a self-checking module, a liquid crystal module, a keyboard module, a communication module, a micro-processor, an isolation module, a DDS module, a conditioning module, an amplitude control module, a power module, an output module, a switching value input module, a switching value isolation module and a LED indication module. The DDS technology can be adopted to produce frequency source, the frequency and the amplitude of which can be adjusted continuously; with the control of each module and connection with crystal display, keyboard input, etc., a menu-type man-machine dialog interface can be realized; therefore, the signal quality can be improved and the operation of the instrument can be simplified.

Description

A kind of airplane engines ground starting up system tester

Technical field

The present invention relates to a kind of aircraft engine testing of equipment instrument, relate in particular to a kind of airplane engines ground starting up system tester.

Background technology

In the general aircraft general assembly later stage, need do inspection to engines ground starting system circuit, to guarantee the correctness of engine operation.It is clean that engines ground starting up system tester need be exported a frequency spectrum, the frequency source that load capacity is strong is used for the frequency signal that the simulated engine speed probe produces and is added to the starting system circuit, by gathering 13 way switch amounts and indicating the correctness of each circuit system with the LED signal lamp.Existing checkout equipment is made up of arbitrary function generator and connecting box, and its function generator method of operating is complicated, and is difficult to satisfy engines ground starting inspection specific requirement.

Summary of the invention

The purpose of this invention is to provide a kind of airplane engines ground starting up system tester, this tester utilization DDS technology, by microprocessor W77E58 the control of DDS chip AD9850 is obtained the frequency sweep reference signal, again to signal filtering, amplification, by the control able to programme of digital potentiometer, just obtained all continuously adjustable frequency source of a frequency and amplitude again.Pass through each module controls again, and connect liquid crystal display, keyboard input etc., thereby improved signal quality, simplification instrumentation.

The present invention is achieved like this: it comprises selftest module, Liquid Crystal Module, Keysheet module, communication module, microprocessor, isolation module, the DDS module, conditioning module, the amplitude control module, power model, output module, switching input module, the switching value isolation module, with the LED indicating module, it is characterized in that: after it imports data by Keysheet module, microprocessor w77e58 isolates the back through isolation module and generates the frequency sweep sine wave signal by changing frequency control word control DDS module, convert sine wave to square-wave signal through conditioning module again, after handling by the amplitude control module, through the power model amplifying power and be sent to output module output; The switching value of the engine of switching input module input simultaneously, the LED light emitting diode on switching value isolation module isolation rear drive LED indicating module, the correctness of indication engine operation.And equipment also has selftest module and compunication module, and equipment can be by computer control.Processor is connected with Liquid Crystal Module and shows various data.

The principle that the microprocessor control DDS that isolates generates the sine wave of standard is: processor adopting W77E58 model, and the DDS chip adopts the AD9850 model; AD9850 has 40 control words, and 32 are used for frequency control (low 32), and 5 are used for phase control, and 1 is used for power supply dormancy (Powerdown) control, and 2 are used to select working method.These 40 control words can be input to AD9850 by parallel or serial mode.In parallel load mode, enter data into register by 8 bus D0-D7, in the rising edge of W-CL K 8 bit data of packing into, and the next input register of pointed, after repeating 5 times, at the FQ-UD rising edge 40 bit data are encased in frequency/phase data register (upgrading DDS output frequency and phase place) from input register again, simultaneously address pointer are reset to first input register.

Advantage of the present invention is: improved signal quality, simplified instrumentation.

Description of drawings

Fig. 1 is a functional-block diagram of the present invention.

Fig. 2 is the work main flow chart of tester.

Fig. 3 is microprocessor control DDS process flow diagram of the present invention.

Selftest module 2, Liquid Crystal Module 3, Keysheet module 4, communication module 5, microprocessor 6, isolation module 7, DDS module 8, conditioning module 9, amplitude control module 10, power model 11, output module 12, switching input module 13, led indicating module 14, switching value isolation module in the drawings, 1,

Embodiment

As shown in Figure 1, the present invention includes selftest module 1, Liquid Crystal Module 2, Keysheet module 3, communication module 4, microprocessor 5, isolation module 6, DDS module 7, conditioning module 8, amplitude control module 9, power model 10, output module 11, switching input module 12, led indicating module 13, switching value isolation module 14.It passes through Keysheet module 3 and imports data such as the frequency of wave modes, peak-to-peak value, frequency sweep step value, control the sine wave of the AD9850 generation standard of DDS modules 7 by the microprocessor 5 of isolation module 6 isolation, convert sine wave to square-wave signal through conditioning module 8 again, after handling by the digital potentiometer of amplitude control module 9 again, behind power model 10 amplifying powers, be sent to output module 11 outputs.Switching input module 12 is imported ten three-way switch amounts of engines simultaneously, the LED light emitting diode on the TLP521 of switching value isolation module 14 light lotus root isolation rear drive led indicating module 13, the correctness of indication engine operation.And equipment also has selftest module 1 and RS323 compunication module 4, and equipment can be by computer control.Processor 5 is connected with OCMJ8 * 15b Liquid Crystal Module 2 and shows various data.The work main flow of tester is with reference to Fig. 2.As shown in Figure 3, the principle that the W77E58 microprocessor 5 control DDS modules 7 of isolating generate the sine wave of standard is: the W77E58p1 mouth connects the DDS data port, DDS modules A D9850 has 40 control words, 32 are used for frequency control (low 32), five are used for phase control, 1 is used for power supply dormancy (Powerdown) control, and two are used to select working method.These 40 control words can be input to AD9850 by parallel or serial mode.In parallel load mode, enter data into register by eight bus D0-D7, in the rising edge of the W-CL K eight bit data of packing into, and the next input register of pointed, after repeating five times, at the FQ-UD rising edge four ten bit data are encased in frequency/phase data register (upgrading DDS output frequency and phase place) from input register again, simultaneously address pointer are reset to first input register.

Claims

1. airplane engines ground starting up system tester, it comprises selftest module, Liquid Crystal Module, Keysheet module, communication module, microprocessor W77E58, isolation module, DDS modules A D9850, conditioning module, the amplitude control module, power model, output module, switching input module, the switching value isolation module, with the LED indicating module, it is characterized in that: it is by the frequency of Keysheet module input waveform, peak-to-peak value and frequency sweep step value, isolate the sine wave signal that back control DDS modules A D9850 generates standard by microprocessor W77E58 through isolation module, convert sine wave signal to square-wave signal through conditioning module again, after handling by the amplitude control module, through the power model amplifying power and be sent to output module output; The switching value of the engine of switching input module input simultaneously, the LED light emitting diode on switching value isolation module isolation rear drive LED indicating module.