Aircraft oil pressure channel calibration system

Abstract

The present invention relates to the technical field of oil pressure channel detection, and specifically to an aircraft oil pressure channel calibration system. The present invention includes a hardware part and a software part. The hardware part of the device includes hardware resources such as equipment and accessories used for metering tests, mainly composed of oil cylinders of three different media, mechanical connection components, electronic control components, main control boards, and expansion units. The software part refers to automatic testing software used to manage the test process and pressure online calibration software that realizes functions such as data storage, query, and exchange. The product of the present invention has a higher degree of integration, forming an integrated device with a small size and weight, and can realize automatic setting of pressure output.

Description

Background Art

[0002] Aircraft oil pressure detection uses three types of isolated calibration equipment for lubricating oil, fuel and hydraulics. They can generate standard lubricating oil, fuel and hydraulic pressures, and are used to calibrate parameter channels of lubricating oil systems, fuel systems and hydraulic systems of given aircraft types. They can also meet the needs of field and overhaul plants for on-board in-situ testing, regular inspection and overhaul of lubricating oil, fuel and hydraulic pressure indicating instruments.

[0003] After years of application practice, the three types of isolated calibration equipment mainly have the following problems: First, the accuracy and stability of the equipment are poor. For example, the compensation of nonlinear errors is not fully considered when reducing pressure output, and the stability caused by the influence of air tightness when reducing pressure output is low; second, the existing equipment is bulky and the degree of integration is not high. The net weight of the three types of equipment is 45kg in total, which is extremely inconvenient to carry and transport, and it will take up more storage space; third, the intelligence and automation of the equipment are not high. The pressure output of the existing equipment needs to be given manually, which is inconvenient to operate and use, and requires multiple people to carry out detection and calibration work; fourth, the design concept is backward, and the relevant components are technologies and products from more than ten years ago. The reliability and stability of the equipment are greatly affected, and the equipment repair rate is high.

[0004] Therefore, it has become a top priority to carry out project research, make comprehensive improvements to the original equipment, and improve its reliability, stability, and portability. Summary of the invention

[0005] In order to provide pressure calibration for parameter channel ports of aircraft lubricating oil systems, fuel systems and hydraulic systems, the present invention provides an aircraft oil pressure channel calibration system, including a controller and a pressure generating unit;

[0006] The pressure generating unit includes an oil cup, a pressure regulating cylinder and a stepping motor;

[0007] The output port of the oil cup is connected to the port of the oil pressure channel of the aircraft;

[0008] The input port of the oil cup is connected to the pressure regulating cylinder, and the pressure regulating cylinder is mechanically connected to the stepping motor;

[0009] A pressure module is provided between the oil cup and the pressure regulating cylinder, and the pressure module is connected to the controller;

[0010] The controller obtains the pressure value injected into the aircraft oil pressure channel port through the pressure module;

[0011] The controller is electrically connected to the stepper motor, and the stepper motor controls the pressure regulating cylinder to input pressure to the oil cup.

[0012] Preferably, a pre-pressure pump is provided between the oil cup and the pressure regulating cylinder, and the pre-pressure pump is electrically connected to the controller;

[0013] The controller includes an automatic voltage regulating unit;

[0014] The automatic pressure regulating unit generates a PWM pulse signal and a direction signal based on the pressure value, and controls the stepping motor and the pre-pressure pump based on the PWM pulse signal and the direction signal.

[0015] Preferably, the oil cup includes a lubricating oil cup, a fuel oil cup and a hydraulic oil cup;

[0016] The controller includes a pressure control unit;

[0017] A pressure control unit, used for controlling the pressure based on the pressure transmission medium;

[0018] Pressure transmission media include lubricating oil, fuel and hydraulic oil.

[0019] Preferably, it also includes a transmission mechanism;

[0020] The pressure regulating cylinder is slidably provided with a trapezoidal lead screw, which is connected to the stepping motor through a transmission mechanism;

[0021] A reducer is also arranged between the transmission mechanism and the stepper motor, and the stepper motor controls the trapezoidal lead screw to adjust the stroke of the pressure regulating cylinder through the reducer.

[0022] Preferably, a stop valve and a pressure gauge assembly are provided between the pre-pressure pump and the pressure regulating cylinder;

[0023] The pressure module is connected to the system through the meter assembly and measures the system pressure;

[0024] The stop valve is electrically connected to the controller, and the controller adjusts the pressure through the stop valve;

[0025] The pressure module includes a pressure sensor.

[0026] Preferably, it also includes a pressure relief valve and a sewage discharge assembly;

[0027] The oil cup is provided with an oil cup drain port, which is connected to the input end of the pressure relief valve;

[0028] The output end of the pressure relief valve is connected to the sewage discharge component;

[0029] The pressure relief valve is electrically connected to the controller, and the controller releases the system pipeline pressure through the pressure relief valve;

[0030] The sewage discharge assembly includes a cleaning medium, a sewage discharge valve and a sewage filter assembly;

[0031] Cleaning media include compressed air, water, hydrogen, nitrogen, and compatible light liquids.

[0032] Preferably, the controller comprises a main control board;

[0033] The main control board is equipped with a single-chip microcomputer, a human-computer interaction unit, a pre-pressure pump drive circuit, a stepper motor drive circuit, a pressure signal acquisition circuit and a communication interface module;

[0034] Human-machine interaction unit, used for operators to operate the equipment and display real-time data;

[0035] Power management circuit, used to provide reliable power supply for other circuits;

[0036] The pre-pressure pump driving circuit includes a motor driving circuit, an output protection circuit and a solenoid valve control circuit;

[0037] The single chip microcomputer is connected to the stepper motor driving circuit, and the operation of the stepper motor is controlled by generating operation parameters through the stepper motor driving circuit.

[0038] Preferably, the communication interface module includes an RS422 interface circuit, an RS485 interface circuit and an RS232 interface circuit;

[0039] The human-machine interaction unit includes an industrial touch screen;

[0040] The stop valve includes a one-way valve.

[0041] Preferably, the controller further comprises an expansion unit, a unit switching module, a parameter setting module, a self-test monitoring module and an electrical measurement unit;

[0042] Extension unit, used for long-distance wireless communication with the host computer, wireless pressure digital signal acquisition, and 4G network data interaction;

[0043] Unit switching module, used to switch the pressure display unit;

[0044] Pressure display units include kPa, MPa, psi, bar, mbar, in-H2O, mmH2O, kgf / cm2;

[0045] Parameter setting module, used to set multiple groups of pressure values ​​and save them;

[0046] The pressure stabilization module is used to collect pressure values ​​to control the pre-pressure pump and the stepper motor to form a closed-loop control, and to control the pressure through the PID algorithm;

[0047] Self-check monitoring module, used for real-time monitoring of power supply, pre-pressure pump operation status, stepper motor operation status, and pressure sensor operation status;

[0048] The electrical measuring unit is used to collect voltage and current values ​​and display them on the industrial touch screen.

[0049] Preferably, it also includes a hand operator;

[0050] The handheld operator is connected to the main control board through the communication interface module and is used to remotely control the pre-pressure pump and stepper motor.

[0051] It can be seen from the above technical solutions that the present invention has the following advantages:

[0052] The present invention sets a controller to control the stroke of the pressure regulating cylinder through a stepper motor, which can inject different pressure values ​​into the oil cup and connect the oil cup with the parameter channel port, thereby meeting the pressure value requirements of different pressure systems of various types of aircraft. The present invention sets a pre-pressure pump to solve the problems of slow pressurization speed and insufficient stroke of the pressure regulating cylinder at low pressure, and can effectively solve the problem of aircraft oil pressure channel detection and calibration. The present invention can automatically generate the optimal operating parameters for the stepper motor through the stepper motor drive circuit, and maximize the performance of the motor. The present invention prevents circuit damage caused by pre-pressure pump problems through an output protection circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0054] Figure 1 This is the overall block diagram of the system.

[0055] Figure 2 This is the system working principle diagram.

[0056] Figure 3 This is the system control schematic diagram.

[0057] Figure 4 It is the overall structure of the pressure generating unit.

[0058] Figure 5 This is the connection diagram of the main control board.

[0059] Figure 6 This is a connection diagram of the controller.

[0060] In the figure: 1-main control board, 2-pressure generating unit, 3-expansion unit, 4-human-machine interaction unit, 5-hand operator, 6-electric measuring unit, 7-oil cup, 71-lubricating oil cup, 72-fuel cup, 73-hydraulic oil cup, 8-pressure relief valve, 9-pre-pressure pump, 10-stop valve, 11-drain assembly, 12-pressure module, 13-meter assembly, 14-pressure regulating cylinder, 15-trapezoidal screw, 16-reducer, 17-stepping motor, 18-transmission mechanism, 19-pressure force output port, 20-boosting component, 21-filtering and draining component, 22-self-test monitoring module, 23-parameter setting module, 24-voltage stabilizing module, 30-controller, 31-single-chip microcomputer, 32-power management circuit, 33-RS232 serial port, 34-spi interface, 35-RS422 serial port, 36-RS485 serial port, 37-stepping motor drive circuit, 38-pre-pressure pump drive circuit, 39-environmental information acquisition circuit, 40-check valve. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0062] Unless otherwise defined, all technical and scientific terms used in the embodiments of the present application have the same meaning as those commonly understood by those skilled in the art of the present application. The terms used in the embodiments of the present application are only for the purpose of describing the embodiments of the present application and are not intended to limit the present application.

[0063] The units and algorithm steps of each example described in the disclosed embodiment of the aircraft oil pressure channel calibration system provided by the present invention can be implemented by electronic hardware, computer software or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to the function. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0064] The block diagrams shown in the drawings of the aircraft oil pressure channel calibration system provided by the present invention are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0065] In the aircraft oil pressure channel calibration system provided by the present invention, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the device embodiment described above is only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, or it can be an electrical, mechanical or other form of connection.

[0066] It will be appreciated by those skilled in the art that the various aspects of the aircraft oil pressure channel calibration system provided by the present invention may be implemented as a system, method or program product. Therefore, various aspects of the present disclosure may be specifically implemented in the following forms, namely: a complete hardware implementation, a complete software implementation (including firmware, microcode, etc.), or an implementation combining hardware and software aspects, which may be collectively referred to herein as a "circuit", "module", "circuit" or "system".

[0067] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0068] The present invention provides an aircraft oil pressure channel calibration system, such as Figures 1 to 6 As shown, it includes: a controller 30 and multiple groups of pressure generating units 2. The pressure generating unit 2 includes an oil cup 7, a pressure regulating cylinder 14 and a stepper motor 17. The oil cup 7 includes a lubricating oil cup 71, a fuel oil cup 72 and a hydraulic oil cup 73. The capacity of the oil cup 7 is set to 500ml. Different oil cups 7 are used to store different pressure transmission media. The pressure transmission media correspond to the oil cups 7. The pressure transmission media specifically include lubricating oil, fuel oil and hydraulic oil. The output port of the oil cup 7 is connected to the aircraft oil pressure channel port for giving a pressure parameter signal. The aircraft oil pressure channel port includes a lubricating oil pressure channel port, a fuel pressure channel port and a hydraulic pressure channel port. The input port of the oil cup 7 is connected to the pressure regulating cylinder 14. The pressure regulating cylinder 14 includes a cylinder body and a piston assembly. The pressure regulating cylinder 14 is slidably provided with a trapezoidal screw 15. The trapezoidal screw 15 is detachably connected to the piston assembly. The trapezoidal screw 15 is connected to the stepper motor 17 through a transmission mechanism 18.

[0069] Stepper motor 17 uses CM57 series stepper motor produced by Shenzhen Leisai Intelligent Control Co., Ltd., with a maximum torque of 2.6Nm and a maximum speed of 2000rpm. The CM series is a high-performance, low-cost stepper motor created by Leisai Intelligent using new Japanese designs, new processes and imported core materials. Compared with common stepper motors on the market, it has the advantages of greater torque, lower heat generation, and better running stability. Due to the use of large-scale automated production lines and strict quality management systems, this series of stepper motors is more stable and reliable, and has better batch consistency of performance parameters. For standard stepper motors, the CM series also comes with multiple categories such as double-output shaft type, brake type, and waterproof type, which can be selected according to different application scenarios. Compared with ordinary spring brakes, permanent magnet brakes have many advantages such as low noise (no noisy mechanical noise), fast response (response time is about 30ms, only 1 / 10 of spring brakes), long life, low heat generation, and low power consumption.

[0070] The present invention further provides a reducer 16 between the transmission mechanism 18 and the stepper motor 17, and the stepper motor 17 controls the trapezoidal screw 15 through the reducer 16 to adjust the cylinder stroke of the pressure regulating cylinder 14. The reducer 16 adopts the ZDE (F) PLE series high-precision planetary reducer produced by Ningbo Zhongda Lide Intelligent Transmission Co., Ltd. The reducer 16 adopts an all-metal structure, which is suitable for a series of motors such as servo motors and stepper motors, and is widely used in the fields of machinery manufacturing, robots and automobiles.

[0071] The oil cup 7 is made of stainless steel as a whole, with high compressive strength and strong corrosion resistance. The sealing structure only has an O-ring static seal, and there is no risk of dynamic seal failure. The oil cup 7 is specially enlarged and has a capacity of 500mL. In view of the problem that the pressurized cavity is relatively large, the present invention is provided with a pre-pressure pump 9 between the oil cup 7 and the pressure regulating cylinder 14, and the pre-pressure pump 9 is electrically connected to the controller 30. The present invention solves the problems of slow pressurization speed and insufficient stroke of the pressure regulating cylinder 14 at low pressure by adding a pre-pressure pump component. The pre-pressure pump 9 adopts the NP42 series NP070 micro gear pump produced by Shanghai Sofu Company. The Sofu NP series micro magnetic gear pump only has an O-ring static seal, and there is no risk of dynamic seal failure. Gears and bearings made of special reinforced PEEK materials, high-precision ceramic shafts, one-time injection molded gears, and special gear profile designs with independent intellectual property rights ensure that the Sofu NP series pump products have ultra-high service life and wear resistance. It is an ideal choice for conveying small flow, high pressure, non-pulsating corrosive liquids, abrasive liquids, and high temperature liquids. The Sofu NP series micro magnetic gear pump has the advantages of high pressure, strong stability, no pulsation, wear resistance, corrosion resistance, strong self-priming, strong dry running ability, and longer service life.

[0072] A pressure module 12 is provided between the oil cup 7 and the pressure regulating cylinder 14, and the pressure module 12 is connected to the controller 30. The pressure module 12 has a piezoresistive silicon pressure sensor with an RS485 digital interface. The sensor is encapsulated in a 316 stainless steel housing, and silicone oil is used to transfer the pressure from the 316 stainless steel diaphragm to the sensing element. The interior also contains a laser fine-tuning resistor for temperature compensation and offset correction. The pressure is calibrated and calibrated through the corresponding circuit algorithm and output as an RS485 digital signal. The pressure module 12 can also be a digital pressure gauge, which is connected to the system through the gauge assembly 13 to measure the system pressure. The present application sets three gauge assemblies 13, and the gauge assembly 13 uses the M20×1.5 standard interface.

[0073] The oil cup 7 is provided with an oil cup drain port, which is connected to the input end of the pressure relief valve 8, and the output end of the pressure relief valve 8 is connected to the drain assembly 11. The pressure relief valve 8 is electrically connected to the controller 30, and the controller 30 discharges the system pipeline pressure through the pressure relief valve 8. The drain assembly 11 includes a cleaning medium, a drain valve and a filter drain assembly 21. A stop valve 10 is provided between the pre-pressure pump 9 and the pressure regulating cylinder 14. The pressure relief valve 8 and the stop valve 10 use the H22 type two-way normally closed solenoid valve produced by Peterpaul. The H22 type two-way normally closed solenoid valve is a high-pressure solenoid valve with a very wide range of pressure and applicable media. The cleaning medium includes various gases and liquids, such as compressed air, water, hydrogen, nitrogen, and alcohol or compatible light liquids, etc., with a maximum working pressure of 40MPa. The pressure relief valve 8 and the stop valve 10 are packaged in a microstructure, with a zero-pressure start direct-acting working principle, and the solenoid valve switch response time is 4 to 16ms.

[0074] The controller 30 obtains the pressure value injected into the oil pressure channel port of the aircraft through the pressure module 12. The controller 30 is electrically connected to the stepper motor 17, and controls the pressure regulating cylinder 14 to input pressure to the oil cup 7 through the stepper motor 17 according to the pressure value. The controller 30 includes a main control board 1, on which a single chip microcomputer 31, a human-computer interaction unit 4, a pre-pressure pump driving circuit 38, a stepper motor driving circuit 37, a pressure signal acquisition circuit and a communication interface module are arranged.

[0075] The single chip microcomputer 31 is a 32-bit high-performance single chip microcomputer, which is used to provide the core control function for the system. The single chip microcomputer 31 uses Cortex TM -M4-based STM32F4 series high-performance microcontrollers, which use 90 nanometer NVM technology and ART (Adaptive Real-Time Memory Accelerator TM)6.4 Software System. ART technology enables zero-wait execution of programs, improves program execution efficiency, and maximizes the performance of Cortex-M4, allowing the STM32 F4 series to reach 210DMIPS@168MHz. The adaptive real-time accelerator can fully unleash the performance of the Cortex-M4 core; when the CPU operates at all allowed frequencies (≤168MHz), the program running in the flash memory can achieve performance equivalent to zero wait cycles. The STM32F4 series microcontroller integrates single-cycle DSP instructions and FPU (floating point unit), which improves computing power and can perform some complex calculations and controls. It is a perfect combination of MCU real-time control functions and DSP signal processing functions.

[0076] The communication interface module includes RS422 interface circuit, RS485 interface circuit, RS232 interface circuit and SPI interface 34. RS232 is a reserved interface for future expansion, such as remote digital pressure acquisition, equipment control, etc. An isolation protection circuit is designed at the interface to prevent static electricity and other abnormal conditions from causing damage to the mainboard. The single-chip microcomputer 31 is connected to the expansion unit 3 through the RS232 interface circuit, which is used for long-distance wireless communication, wireless pressure digital signal acquisition, and 4G network data interaction with the host computer. The single-chip microcomputer 31 is connected to the human-computer interaction unit 4 through the SPI interface 34, which is used for operators to operate the equipment and display real-time data. RS422 is the interface of the hand operator 5, which uses a fast aviation plug to ensure the reliability and stability of the connection. The single-chip microcomputer 31 is connected to the hand operator 5 through the RS422 interface circuit, and the pre-pressure pump 9 and the stepper motor 17 are remotely controlled through the hand operator 5. The single-chip microcomputer 31 is connected to the pressure module 12 through the RS485 interface circuit for pressure signal acquisition. The RS485 bus is connected to the three-way pressure module 12 and provides 5V power supply for collecting and calibrating pressure values. Since the main control board 1 and the pressure module 12 are both inside the device, they are connected using the XH2.54 interface.

[0077] The single-chip computer 31 is connected to the power management circuit 32 to provide reliable power supply for other circuits. The device is powered by a 24V lithium battery. The power management circuit 32 steps down the input 24V voltage to 5V and 2A through a DC-DC transformer to power the serial port, peripheral driver chip and hand operator 5, and 3.3V to power the single-chip computer 31. There are overcurrent and overvoltage protection circuits and anti-reverse connection protection circuits at the power input end, and there are overcurrent and overvoltage protection circuits at the output end. At the same time, the ADC analog-to-digital converter of the single-chip computer 31 is used to collect and monitor each voltage, and the system power supply status can be observed in real time through the human-computer interaction unit 4. The human-computer interaction unit 4 has specific function buttons. The human-computer interaction unit 4 uses a 5.0-inch screen. The operation method can be basically understood through the button labels, and all functions are simple and clear.

[0078] The single-chip microcomputer 31 is also connected to the pre-pressure pump driving circuit 38 and the stepper motor driving circuit 37. The stepper motor driving circuit 37 adopts 32-bit DSP technology and built-in micro-segmentation technology. Even under low segmentation conditions, the effect of high segmentation can be achieved, and low, medium and high speed operations are very stable and low noise. The stepper motor driving circuit 37 includes a driver, and the driver has an integrated parameter automatic setting function, which can automatically generate better operating parameters for the motor and maximize the performance of the motor. It is connected to the single-chip microcomputer 31 through pwm signals, direction control, and error detection signals to perform voltage stabilization control. pwm pulse signal + direction signal, that is, the pulse signal determines the motor speed, and the direction signal determines the input signal given mode of the motor rotation direction.

[0079] The pre-pressure pump driving circuit 38 is composed of a motor driving circuit and a solenoid valve control circuit. The motor driving circuit has an output protection circuit to prevent the circuit from being damaged due to problems with the pre-pressure pump 9. Since the pressurization speed is particularly slow at low pressure during the pressure measurement process, the pre-pressure pump 9 can directly and quickly skip this stage, thereby improving the verification efficiency and user experience.

[0080] The single chip microcomputer 31 is also connected to the environmental information collection circuit 39, which includes a sensor of model BME280. The BME280 sensor is a mature digital humidity, pressure and temperature sensor. The sensor has a very compact metal cover LGA package, requiring an area of ​​only 2.5×2.5mm 2 , with a height of 0.93mm. It is small in size and low in power consumption, making it suitable for use in battery-driven devices such as mobile phones, GPS handsets or watches.

[0081] Based on the above configuration, the aircraft oil pressure channel calibration system of the present invention is composed of a three-in-one fully automatic pressure source composed of a hardware part and a software part. The structure of the present invention is specifically described as an example, wherein the hardware part of the device includes hardware resources such as equipment and accessories used for measurement testing, including oil cylinders of three different pressure transmission media, mechanical connection components, electronic control components, main control board 1, expansion unit 3, etc. The software part refers to the automatic test software used to manage the test process and the pressure online calibration software that realizes functions such as data storage, query, and exchange. The overall composition block diagram of the device is shown in the figure. Figure 1 As shown, it can be seen that the entire oil pressure channel comprehensive detection device mainly includes: 8 different independent modules or units including: main control board 1, pressure generating unit 2, human-computer interaction unit 4, pressure module 12, electric measuring unit, and expansion unit 3.

[0082] The lubricating oil pressure generating unit, fuel pressure generating unit and hydraulic pressure generating unit are used as examples for specific description. The pressure generating unit 2 includes a servo system and a pressure sensor to complete the generation, output and collection of pressure. Each group of pressure generating units 2 includes an oil cup assembly, a pressurizing component, a meter connection assembly, a sewage discharge assembly 11, a pre-pressure pump 9, etc. The main control board controls the stepper motor 17 and the pre-pressure pump 9 through 6-way PWM pulse + direction signals to adjust the system pressure. The pressure sensor detects the real-time pressure of the system and controls the pressure generating unit 2 as a feedback signal. The pressure module 12 communicates with the main control board through the RS485 bus to collect real-time pressure values.

[0083] The human-computer interaction unit 4 includes a high-performance industrial touch screen. The high-performance industrial touch screen communicates with the main control board through the RS232 bus to realize real-time data interaction. The physical function is connected to the main control board using a flat cable to realize the input of function button signals. The main control board 1 controls the pressure control unit stepper motor 17 through the corresponding control algorithm, collects the real-time pressure value of the pressure module 12 through the communication protocol, collects the power signal, responds to the physical function buttons and interacts with the touch screen. The main control board 1 includes a display and operation unit, a signal processing feedback unit and a pressure control unit. The principle is as follows Figure 3 As shown, the pressure of the pressure-transmitting medium is controlled by a pressure control unit, a target pressure value is input, and the controlled pressure is measured by a pressure sensor and directly displayed on a display.

[0084] The main control board 1 also includes an electric measuring unit, which collects voltage (0-10V) and current value (0-20mA) through the equipment installed by the user and displays them on the screen. The hand operator 5 is connected to the main control board 1. The function of the hand operator 5 is consistent with that of the human-computer interaction unit 4. It is connected to the main control board 1 through the RS422 bus interface to achieve remote control. The expansion unit 3 includes an RS232 interface, which can be extended to perform long-distance wireless communication with the host computer, wireless pressure digital signal acquisition, 4G network data interaction, etc.

[0085] The present invention also designs a box for protecting the main control board 1, the human-computer interaction unit 4 and other hardware parts. When designing the box shape, the present invention simplifies the design structure, reduces the volume and weight as much as possible, and customizes the pull-rod box-type shape structure, which is convenient to carry outside, and can better meet the pressure verification and measurement requirements of industrial sites. The equipment box is made of special mixed resin injection molding, which is light in weight and ensures the firmness of the box. The box as a whole is waterproof, pressure-resistant, shock-proof, corrosion-resistant, and salt spray-resistant. The lock is easy to open and close, and at the same time ensures durability. The automatic gas balancing valve can balance the internal and external pressures of the box at any time to ensure that the box can be easily opened. The operating interface on the box includes a charging power port, a power switch, three meter sockets, three oil filling ports, an electrical measurement interface and a touch screen.

[0086] The present invention constructs multiple groups of button identifiers in the human-computer interaction unit 4 through configuration software, including a channel selection button, a unit switching button, a pressure setting button, a pressure relief button, a pre-pressure button, a pressure stabilization button, and a stop button.

[0087] Channel selection button: select three channels and switch them by simply clicking. The three channels are the lubricating oil pressure channel, the fuel pressure channel and the hydraulic pressure channel.

[0088] Unit switch button: To switch the pressure display unit, click the unit value of the pressure setting part of the screen to switch. Contains units: kPa, MPa, psi, bar, mbar, inH2O, mmH2O, kgf / cm2, etc.

[0089] Pressure setting button: Click the pressure setting button to set the pressure. Multiple pressure settings can be set and saved. During the pressure stabilization process, you can directly click the next point or previous point button to jump directly to the set pressure point, which is convenient for users to test.

[0090] Pressure relief button: relieves system pipeline pressure.

[0091] Pre-pressurization button: A special button for removing air from the connecting pipe. Press it to slowly pressurize the system, and release it to stop pressurization.

[0092] Pressure stabilization button: After setting the pressure, press the pressure stabilization button and the system will automatically adjust the pressure to the set pressure value and maintain it.

[0093] Stop button: System pressurization and other electromechanical equipment will stop working.

[0094] The software system of the present invention is divided into four parts: a self-checking monitoring module 22, a parameter setting module 23, a voltage stabilizing module 24, and a display module.

[0095] Self-check monitoring module 22: The power supply, the operating status of the pre-pressure pump 9, the operating status of the stepper motor 17 and the operating status of the pressure sensor are monitored in real time through an analog-to-digital converter. If an abnormality is found, the cause of the abnormality and the solution will be fed back on the screen.

[0096] Parameter setting module 23: realizes the channel selection function and the pressure point setting function. The pressure point setting can set multiple groups of pressure values ​​and save them for later use.

[0097] Pressure stabilizing module 24: Collects pressure values ​​to control pre-pressure pump 9 and stepper motor 17 to form a closed-loop control system, and accurately controls pressure through fuzzy PID combined with the company's self-developed algorithm.

[0098] Electrical measuring unit: collects 0-20mA current and 0-10V voltage values ​​of the connected equipment, displays them on the display, and converts them into pressure values ​​according to the range setting.

[0099] Human-computer interaction unit 4: The hardware consists of a 5-inch LCD resistive touch screen, which displays system information and collects user input information through a GUI program.

[0100] Aiming at the problems existing in the three-type calibration equipment, the present invention uses advanced materials, testing and electronic technologies to develop equipment with higher reliability, stability and precision. Compared with the existing three-type equipment, the newly developed equipment has the following advantages: first, the measurement, display and control of the product can eliminate most of the principle errors and have higher precision; second, the product has a higher degree of integration, forming an integrated device with small volume and weight; third, the automatic setting of pressure output is realized; fourth, the design problems and component performance problems left over from the use of previous products are improved. Therefore, the newly developed equipment can effectively solve the problems of aircraft oil pressure channel detection and calibration. In addition to meeting basic support needs, the newly developed equipment also effectively reduces the volume, improves the signal setting accuracy and reduces the complexity of operation, thereby shortening the preparation time of support work, improving the system troubleshooting efficiency and reducing the need for personnel, which can effectively improve the efficiency of ground staff in carrying out related maintenance and support work.

[0101] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An aircraft oil pressure channel calibration system, characterized in that: It includes a controller and a pressure generating unit; The pressure generating unit includes an oil cup, a pressure regulating cylinder and a stepping motor; The output port of the oil cup is connected to the port of the oil pressure channel of the aircraft; The input port of the oil cup is connected to the pressure regulating cylinder, and the pressure regulating cylinder is mechanically connected to the stepping motor; A pressure module is provided between the oil cup and the pressure regulating cylinder, and the pressure module is connected to the controller; The controller obtains the pressure value injected into the aircraft oil pressure channel port through the pressure module; The controller is electrically connected to the stepper motor, and the stepper motor controls the pressure regulating cylinder to input pressure to the oil cup; A pre-pressure pump is provided between the oil cup and the pressure regulating cylinder, and the pre-pressure pump is electrically connected to the controller; The controller includes an automatic voltage regulating unit; The automatic pressure regulating unit generates a PWM pulse signal and a direction signal based on the pressure value, and a stop valve and a meter assembly are arranged between the stepping motor, the pre-pressure pump and the pressure regulating cylinder based on the PWM pulse signal and the direction signal; The pressure module is connected to the system through the meter assembly and measures the system pressure; The stop valve is electrically connected to the controller, and the controller adjusts the pressure through the stop valve; The pressure module includes a pressure sensor; The pre-pressure pump is controlled; The controller includes a main control board; The main control board is equipped with a single-chip microcomputer, a human-computer interaction unit, a pre-pressure pump drive circuit, a stepper motor drive circuit, a pressure signal acquisition circuit and a communication interface module; Human-machine interaction unit, used for operators to operate the equipment and display real-time data; Power management circuit, used to provide reliable power supply for other circuits; The pre-pressure pump driving circuit includes a motor driving circuit, an output protection circuit and a solenoid valve control circuit; The single chip microcomputer is connected to the stepper motor driving circuit, and the stepper motor driving circuit generates operating parameters to control the operation of the stepper motor; The communication interface module includes RS422 interface circuit, RS485 interface circuit and RS232 interface circuit; The human-machine interaction unit includes an industrial touch screen; The stop valve includes a one-way valve; The controller also includes an expansion unit, a unit switching module, a parameter setting module, a self-test monitoring module, a voltage stabilization module and an electrical measurement unit; Extension unit, used for long-distance wireless communication with the host computer, wireless pressure digital signal acquisition, and 4G network data interaction; Unit switching module, used to switch the pressure display unit; Pressure display units include kPa, MPa, psi, bar, mbar, in-H2O, mmH2O, kgf / cm2; Parameter setting module, used to set multiple groups of pressure values ​​and save them; Self-check monitoring module, used for real-time monitoring of power supply, pre-pressure pump operation status, stepper motor operation status, and pressure sensor operation status; The pressure stabilization module is used to collect pressure values ​​to control the pre-pressure pump and the stepper motor to form a closed-loop control, and to control the pressure through the PID algorithm; The electrical measuring unit is used to collect voltage and current values ​​and display them on the industrial touch screen.

2. The aircraft oil pressure channel calibration system according to claim 1, characterized in that: The oil cup includes lubricating oil cup, fuel oil cup and hydraulic oil cup; The controller includes a pressure control unit; A pressure control unit, used for controlling the pressure based on the pressure transmission medium; Pressure transmission media include lubricating oil, fuel and hydraulic oil.

3. The aircraft oil pressure channel calibration system according to claim 1, characterized in that: Also includes a transmission mechanism; The pressure regulating cylinder is slidably provided with a trapezoidal lead screw, which is connected to the stepping motor through a transmission mechanism; A reducer is also arranged between the transmission mechanism and the stepper motor, and the stepper motor controls the trapezoidal lead screw to adjust the stroke of the pressure regulating cylinder through the reducer.

4. The aircraft oil pressure channel calibration system according to claim 1, characterized in that: Also included are pressure relief valves and blowdown assemblies; The oil cup is provided with an oil cup drain port, which is connected to the input end of the pressure relief valve; The output end of the pressure relief valve is connected to the sewage discharge component; The pressure relief valve is electrically connected to the controller, and the controller releases the system pipeline pressure through the pressure relief valve; The sewage discharge assembly includes a cleaning medium, a sewage discharge valve and a sewage filter assembly; Cleaning media include compressed air, water, hydrogen, nitrogen, and compatible light liquids.

5. The aircraft oil pressure channel calibration system according to claim 1, characterized in that: Also includes a hand operator; The handheld operator is connected to the main control board through the communication interface module and is used to remotely control the pre-pressure pump and stepper motor.

Images