Spoiler type steering engine test circuit

Abstract

The invention relates to a spoiler type steering engine test circuit, which comprises a power supply circuit 1, a digital control circuit 2, an ignition receiving circuit 3, a driving circuit 4, an interface circuit 5 and a key display circuit 6, the ignition receiving circuit 3 converts an engine ignition signal into a level signal which can be received and processed by the digital control circuit 2, the digital control circuit 2 generates a PWM signal and controls the drive circuit 4 to drive a steering engine to work, then different test requirements can be met by changing system software through a C language, and digital storage and reading of a test data curve are achieved. And test data are read through special upper computer software, so that the data reading efficiency and accuracy are improved.

Description

Technical Field

[0001] The invention relates to the technical field of steering gear test circuits, and in particular to a spoiler type steering gear test circuit. Background Art

[0002] The double-spoiler gas servo is a control system for aircraft attitude adjustment. It is mainly used in the low-speed flight stage or in an environment outside the atmosphere. When the efficiency of traditional air rudders is low, the high-temperature gas of the engine is used to generate a biasing force for attitude adjustment. The double-spoiler gas servo contains two rudders, each of which drives its own rudder blade to cut in and out through an electromagnet. The original servo tester is mainly used for the test of single-spoiler gas servos, and cannot meet the working timing and test requirements of double-spoiler gas servos. The original tester uses a light oscilloscope to print out the sampled electromagnet working current curve using photosensitive recording paper. This method uses a single-channel electromagnet drive, which does not meet the dual-channel electromagnet drive requirements of the servo. In addition, the optical oscilloscope equipment is aging and malfunctions frequently, and the photosensitive recording paper is expensive, making the cost of use too high. At the same time, the photosensitive recording paper needs to be properly exposed to light in order to read the data. If the operation is improper, the data is easily lost, which is not conducive to long-term storage. Summary of the invention

[0003] In view of this, the present invention provides a spoiler type servo test circuit, which effectively solves the technical problem that the prior art cannot obtain the electromagnet working current curve according to the working timing of the servo.

[0004] To achieve the above purpose, a spoiler-type servo test circuit is provided, the test circuit comprising a power supply circuit 1, a control circuit 2, an ignition receiving circuit 3, a drive circuit 4, an interface circuit 5 and a key display circuit 6, the output end of the power supply circuit 1 is connected to an input port of the control circuit 2, an input / output port of the control circuit 2 is connected to an input / output port of the key display circuit 6, an input port of the control circuit 2 is connected to an output port of the ignition receiving circuit 3, an output port of the control circuit 2 is connected to the drive circuit 4, and the output port of the drive circuit 4 is connected to the input port of the interface circuit 5; The control circuit 2 sends four PWM signals to the drive circuit 4, and the drive circuit 4 sends drive signals to the steering gear.

[0005] Preferably, the power supply circuit 1 is connected to an input power supply, a part of the input power supply passes through a filter circuit in the power supply circuit 1 to provide power to the drive circuit, and the other part is converted through a DC / DC circuit and an AMS1117 voltage regulator chip to provide control power to the test circuit.

[0006] Preferably, the control circuit 2 includes a main chip digital processor C8051F020, a JTAG circuit, and a reset circuit. The control circuit 2 receives signals from the ignition receiving circuit 3, the key display circuit 6, and the driving circuit 4 and outputs a control clock signal and a PWM signal.

[0007] Preferably, the driving circuit 4 comprises four identical independent power drivers.

[0008] Preferably, the test circuit is implemented by a digital processor C8051F020 control software, and the control software is written in C language, including I0 peripheral initialization, key program and ignition receiving program and T0, T1 interrupt service programs; T0 timer periodic interrupt is used to adjust the PWM signal duty cycle, and T1 timer periodic interrupt is used for the time base of the ignition receiving program servo working.

[0009] Compared with the prior art, the present invention has the following beneficial effects: The dual-spoiler gas servo test circuit provided by the present invention can drive the dual-path servo blades to act according to the servo working sequence, and according to different requirements of the servo test, the function can be realized by changing the test circuit software without changing the hardware circuit design; The solution provided by the present invention can realize digital storage and reading of test data curves, read test data through dedicated host computer software, and improve data reading efficiency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The present invention is a block diagram of a double spoiler type gas servo test circuit; Figure 2 It is a structural schematic diagram of the digital control circuit of the present invention; Figure 3 This is a schematic diagram of the connection between the drive circuit, digital control circuit and steering gear of the present invention; Figure 4 It is the overall flow chart of the control software of the present invention. DETAILED DESCRIPTION

[0011] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0012] In order to effectively improve the data reading efficiency and accuracy, a dual-spoiler gas servo test circuit obtains an electromagnet working current curve according to the working timing of the servo, the present invention provides a spoiler-type servo test circuit, the test circuit comprising a power supply circuit 1, a control circuit 2, an ignition receiving circuit 3, a drive circuit 4, an interface circuit 5 and a key display circuit 6, the output end of the power supply circuit 1 is connected to an input port of the control circuit 2, an input / output port of the control circuit 2 is connected to an input / output port of the key display circuit 6, an input port of the control circuit 2 is connected to an output port of the ignition receiving circuit 3, an output port of the control circuit 2 is connected to the drive circuit 4, and the output port of the drive circuit 4 is connected to the input port of the interface circuit 5; The control circuit 2 sends four PWM signals to the drive circuit 4, and the drive circuit 4 sends drive signals to the steering gear.

[0013] The power supply circuit 1 is connected to the input power supply. A part of the input power supply passes through the filter circuit in the power supply circuit 1 to provide power for the drive circuit, and the other part is converted through the DC / DC circuit and the AMS1117 voltage regulator chip to provide control power for the test circuit. like Figure 2 As shown, the control circuit 2 uses C8051F020 as the main control chip, which is a fully integrated mixed-signal system-level MCU chip with 64 digital I / O pins. The number of peripheral interfaces meets the control needs. The main function of the control circuit is to respond to key actions to generate control signals for the display circuit and the drive circuit; the control circuit 2 also includes a JTAG circuit and a reset circuit. The control circuit 2 receives signals from the ignition receiving circuit 3, the key display circuit 6 and the drive circuit 4 and outputs a control clock signal and a PWM signal; The ignition receiving circuit 3 converts the engine ignition signal into a level signal that can be received and processed by the control circuit; The drive circuit 4 adopts a digital isolation type four-way servo drive microcircuit module, which includes four identical independent power drivers. The module inputs the TTL level generated by the control circuit, and drives the electromagnet to move according to the level. The interface circuit 5 is an electrical interface for connecting the signal to be detected to the data acquisition equipment; The key display circuit 6 is composed of a key circuit and a digital display circuit. Its function needs to be checked before the static ignition test of the servo. The single-way cut-in and exit and double-way continuous action of the servo can be realized through different key actions. During the formal ignition test, the digital display circuit displays the working time of the servo. like Figure 4As shown, the test circuit is realized by the digital processor C8051F020 control software. The control software is written in C language, including I0 peripheral initialization, key program and ignition receiving program and T0, T1 interrupt service program; T0 timer periodic interrupt is used to adjust the PWM signal duty cycle, and T1 timer periodic interrupt is used for the time base of the ignition receiving program servo operation; In order to simplify the circuit design and not affect the normal operation of the servo, a 0.2 ohm resistor is connected in series in the electromagnet circuit. At this time, the voltage difference on the resistor is only about 400 millivolts, which has little effect on the normal operation of the servo and can be ignored. The voltage curve at both ends of the resistor is collected by digital acquisition equipment, and the working current curve of the electromagnet is obtained.

[0014] The test circuit provided by the present invention mainly has two functions: one is to perform static detection on the servo before the ignition test, and realize the cutting in, exiting and continuous action of the spoiler through different buttons; the other is that after receiving the engine ignition signal, the test circuit drives the servo according to the working sequence of the servo. First, the present invention utilizes the flexibility of C language, and on the basis of the original hardware circuit, it can meet different test requirements by changing the system software; secondly, it realizes the digital storage and reading of the test data curve, and reads the test data through the dedicated host computer software, so as to improve the data reading efficiency and accuracy. The present invention adopts digital design, the circuit is simple and reliable, and meets the test requirements of the double spoiler gas servo.

[0015] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A spoiler-type servo test circuit, It is characterized in that The test circuit includes a power supply circuit 1, a control circuit 2, an ignition receiving circuit 3, a drive circuit 4, an interface circuit 5 and a key display circuit 6, wherein the output end of the power supply circuit 1 is connected to an input port of the control circuit 2, an input / output port of the control circuit 2 is connected to an input / output port of the key display circuit 6, an input port of the control circuit 2 is connected to an output port of the ignition receiving circuit 3, an output port of the control circuit 2 is connected to the drive circuit 4, and an output port of the drive circuit 4 is connected to an input port of the interface circuit 5; The control circuit 2 sends four PWM signals to the drive circuit 4, and the drive circuit 4 sends drive signals to the steering gear.

2. A spoiler type servo test circuit according to claim 1, It is characterized in that The power supply circuit 1 is connected to the input power supply. A part of the input power supply passes through the filter circuit in the power supply circuit 1 to provide power for the drive circuit, and the other part is converted through the DC / DC circuit and the AMS1117 voltage regulator chip to provide control power for the test circuit.

3. A spoiler type servo test circuit according to claim 1, It is characterized in that The control circuit 2 includes a main chip digital processor C8051F020, a JTAG circuit, and a reset circuit. The control circuit 2 receives signals from the ignition receiving circuit 3, the key display circuit 6, and the driving circuit 4 and outputs a control clock signal and a PWM signal.

4. A spoiler type servo test circuit according to claim 1, It is characterized in that The driving circuit 4 includes four identical independent power drivers.

5. A spoiler type servo test circuit according to claim 1, It is characterized in that The test circuit is implemented by the digital processor C8051F020 control software, and the control software is written in C language, including I0 peripheral initialization, key program and ignition receiving program and T0, T1 interrupt service program; T0 timer periodic interrupt is used to adjust the PWM signal duty cycle, and T1 timer periodic interrupt is used for the time base of the ignition receiving program servo working.

Images